machine for vacuum film packaging of a product disposed on a support and method for vacuum film pack

专利摘要:
vacuum film packaging of a product disposed on a support the present invention relates to a machine (1) for vacuum film packaging of a product disposed on a support (7). the support has a side wall with at least one hole (70). the machine comprises a first film transfer plate configured to hold the film sheet, heat the film sheet, bring the film sheet to a position above the support with the product disposed on it and airtightly secure the film sheet. film in the holder. the machine also comprises a vacuum arrangement for removing air from inside the support under the film sheet through at least one hole. the first film transfer plate is configured to release the film sheet thereby allowing the film sheet to be sucked into the holder while the vacuum arrangement is removing air from inside the holder.
公开号:BR112012001894B1
申请号:R112012001894
申请日:2010-07-28
公开日:2020-04-22
发明作者:Rizzi Jvanohe；Palumbo Riccardo
申请人:Cryovac Inc；
IPC主号:

专利说明:

(54) Title: MACHINE FOR VACUUM FILM PACKAGING OF A PRODUCT DISPLAYED ON A SUPPORT AND METHOD FOR VACUUM PACKAGING OF A PRODUCT DISPLAYED ON A SUPPORT.
(51) Int.CI .: B65B 02/31; B65B 7/16; B65B 41/14; B65B 59/00.
(30) Unionist Priority: 07/29/2009 EP 09 166750.1.
(73) Holder (s): CRYOVAC, INC ..
(72) Inventor (s): RICCARDO PALUMBO; JVANOHE RIZZI.
(86) PCT Application: PCT EP2010060967 of 28/07/2010 (87) PCT Publication: WO 2011/012652 of 03/02/2011 (85) Date of the Beginning of the National Phase: 27/01/2012 (57) Summary: VACUUM PACKAGING OF A PRODUCT PLACED ON A SUPPORT The present invention relates to a machine (1) for vacuum film packaging of a product disposed on a support (7). The support has a side wall with at least one hole (70). The machine comprises a first film transfer plate configured to hold the film sheet, heat the film sheet, bring the film sheet to a position above the support with the product disposed on it and seal the film sheet tightly in the air. film in the holder. The machine also comprises a vacuum arrangement for removing air from inside the holder under the film sheet through at least one hole. The first film transfer plate is configured to release the film sheet thereby allowing the film sheet to be sucked into the holder while the vacuum arrangement is removing air from inside the holder.
1/30
Invention Patent Report for MACHINE FOR VACUUM PACKAGING OF A PRODUCT DISPLAYED ON A SUPPORT AND METHOD FOR VACUUM PACKAGING OF A PRODUCT DISPLAYED ON A SUPPORT.
FIELD OF TECHNIQUE [001] The present invention relates generally to the packaging of vacuum film products. Specifically, the present invention relates to a machine and a method for packaging vacuum film of product disposed on a support.
FUNDAMENTALS OF THE TECHNIQUE [002] Vacuum packaging is a well-known process for packaging a wide variety of products, specifically food products.
[003] Among the known vacuum packaging processes, vacuum film packaging is commonly used to package food products such as fresh and frozen meat and fish, cheese, processed meat, ready meals and the like. The vacuum film packaging is described, for example, in FR 1 258 357, FR 1 286 018, AU 3 491 504, US RE 30 009, US 3 574 642, US 3 681 092, US 3 713 849, US 4 055 672, and US 5 346 735.
[004] Vacuum film packaging is basically a thermoforming process. Specifically, the product is typically placed on a rigid or semi-rigid support (such as a tray, bowl or glass). The support with the product placed on it is placed inside a vacuum chamber, where a film of thermoplastic material is vacuum-trapped in a position above the product placed on the support, is heated to soften it. The space between the support and the film is then evacuated and finally the vacuum above the film is released to make the film cover around
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2/30 the entire product and seal on the surface of the support not covered by the product, thus forming a tight film around the product on the support.
[005] US 2007/0022717 describes a machine for the gas-tight packaging of an object using a film material. The machine has a lower tool to support two trays and an upper tool that has cutting devices and faces the lower tool. A film is interposed between the upper tool and the lower tool. The film is first cut to the size of the peripheral edges of the trays, and is applied subsequently and / or simultaneously to the peripheral edge in a gas-tight manner. A vacuum is located in the region surrounding the tray to cause the film to be deeply embedded in response to the formation of a pressure drop.
[006] US 2005/0257501 describes a machine for packaging the product arranged on a tray. The machine has a lower tool to support the tray and an upper tool with a cutting device. During operation, the film is attached along an edge that surrounds the tray and is deformed by the upper tool in a direction that extends away from the product. The space surrounding the product is then evacuated, the film and the edge of the tray are sealed and the film is then cut by the cutting device.
[007] US 3481101 describes a method for making film packs using a support provided with a plurality of openings on its lip. According to this method, after the tray is filled, a heated cover film is wrapped over the tray and a vacuum is applied so that the air inside the package is sucked out of the package and the film is aspirated to a sealing condition by heat with the tray to form an airtight seal of the cover with the tray lip. Additional openings
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3/30 can be provided on the upper side walls of the tray by means of which the heated film is not only sucked in sealing contact with the lip of the tray, but is also partially sucked into the cavity.
[008] EP 320294 describes a film packaging method in which a tray loaded with a product provided with ventilation on its side wall is placed on a vacuum platform, an excess of the thermoplastic film is held on the tray by a frame and heated until it begins to sag over the product, then a vacuum is applied under the tray to pull the film to conform to the surface of the product and over and around the edge of the tray in a thermally adjusted crimp seal. The excess film is then trimmed.
SUMMARY OF THE INVENTION [009] The Applicant has noted that the above known solutions for vacuum film packaging have some disadvantages.
[0010] As for the machines described by US 2007/0022717 and US 2005/0257501, the film is cut to the size of the support inside the chamber formed by the upper tool and the lower tool, by means of the cutting devices provided in the upper tool.
[0011] First of all, this disadvantageously requires providing a rather complex and bulky top tool, which comprises a means for securing the film above the supports loaded with product positioned inside the vacuum chamber.
[0012] Furthermore, this disadvantageously requires providing an excess of film in relation to the size of the support, the excess of which is cut from the packaging and rendered useless during or at the end of the packaging process. Indeed, the film in the form of a continuous sheet wound on a roll (as shown, for example, in figure 3 of US 2005/0257501). Therefore, an excess of film is required
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4/30 to allow the film to be pulled from the roll and secured in place above the supported product. Still in US 2007/0022717 more than one support loaded with product (namely, two) are packed in each cycle, so that an excess of film is also present between the adjacent supports. The Applicant has estimated that the excess film cut from the packaging and rendered useless may be 30% to 40% of the total amount of film pulled from the roll.
[0013] Also, in the machines described by US 2007/0022717 and US 2005/0257501 the removal of air from the inside of the support is possible only as long as the film is safe above the support and the product. As the film contacts the surface of the support along a closed line, air can no longer be removed from inside the support. Thus, specifically when a deep tray is used as a support for the product, air pockets can disadvantageously remain trapped between the film and the bottom surface of the support. Air bags can disadvantageously negatively influence the shelf life of the product as well as the impression the consumer has on the packaging.
[0014] In the US 3481101 and EP 0320294 film packaging methods, the openings in the holder allow the removal of air from inside the holder even after the film has contacted the holder, thus reducing the risk of leaving air pockets inside the package [0015] Consequently, the applicant faced the problem of providing a vacuum film packaging machine for a product disposed on a support which (similar to the US 3481101 and EP 0320294 film packaging methods) reduces the risk of leaving bags of air inside the package and at the same time overcomes at least one of the aforementioned disadvantages of US 2007/0022717 and US 2005/0257501 machines, that is, it is simpler and more compact than these machines and minimizes excesses
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5/30 s of film that is cut from the packaging and rendered useless during or at the end of the packaging process.
[0016] According to a first aspect, the present invention provides a machine for vacuum film packaging of a product disposed on a support, the support having a side wall with at least one hole, the machine comprising:
- a first film transfer plate configured to hold the film sheet, heat the film sheet, bring the film sheet to a position above the support with the product disposed on it and seal the film sheet in the air tightly. Support; and
- a vacuum arrangement for removing air from inside the holder under the film sheet through at least one hole, the first film transfer plate being configured to release the film sheet thereby allowing the film sheet to be aspirated into the holder while the vacuum arrangement is removing air from inside the holder.
[0017] Preferably, the machine further comprises a second film transfer plate, the first film transfer plate and the second film transfer plate being arranged so that:
- during a first stage of operation of the machine, the first film transfer plate holds a first film sheet and heats the first film sheet, while the second film transfer plate releases a second film sheet thereby allowing that the second sheet is aspirated into a first support; and
- during a second stage of operation of the machine, the second film transfer plate holds a third film sheet and heats the third film sheet, while the first film plate
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6/30 film transfer releases the first sheet of film thereby allowing the first sheet of film to be aspirated into a second holder.
[0018] Preferably, the machine also comprises a rotating cylinder suitable for rotating around its geometric axis X, the first film transfer plate and the second film transfer plate being connected to the rotating cylinder so that when the rotating cylinder rotates around its X geometric axis, the positions of the first film transfer plate and the second film transfer plate are switched.
[0019] The machine usefully still comprises a roll holder set configured to support a roll of film from which the film sheet is cut.
[0020] Preferably, the machine further comprises a cutting device that has a cutting blade suitable for cutting the film sheet from the film roll and a suitable backing plate for retaining the film sheet after it has been cut.
[0021] Preferably, the backing plate has a number of holes suitable for vacuuming allowing the retention of the film sheet.
[0022] Preferably the first film transfer plate is configured to support against the support plate with the film sheet disposed between them and to move the film sheet away from the support plate by adhesion.
[0023] Preferably, the first film transfer plate has an opening connected in the vacuum arrangement, the opening allowing to vacuum the vacuum while the first film transfer plate is holding the film sheet and allowing the air to be reintroduced by this by inducing the first film transfer plate to release the film sheet.
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7/30 [0024] Preferably, the machine still comprises a base unit suitable for supporting the support while the film sheet is sucked into the support.
[0025] According to a first preferred variant, the base unit comprises an external fixed element and an internal slide element, the internal slide element being suitable to support the support, the external fixed element having one or more vacuum ducts formed in the its thickness and connected in the vacuum arrangement, the vacuum ducts being in connection with at least one hole when the support rests on the inner slide element and the inner slide element engages a cavity of the outer fixed element.
[0026] According to a second preferred variant, the base unit comprises an outer element, a fixed base plate and an adapter with a number of leveling feet, the adapter being suitable for supporting the support and resting on the base plate. fixed base with the number of leveling feet projecting on a lower side of the fixed base plate, the external element having a base and a side wall that defines a central cavity, the central cavity of the external element being dimensioned to allow the fixed base and adapter slide into the central cavity.
[0027] According to a second aspect, the present invention provides a method for packaging vacuum film of a product disposed on a support, the method comprising:
- provide at least one hole in a side wall of the support;
- provide a sheet of film;
- using a first film transfer plate, attach the film sheet, heat the film sheet, bring the film sheet to a position above the support with the product on
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8/30 the same and airtightly fix the film sheet in the support;
- remove air from inside the support under the film sheet through at least one hole; and
- while the air is removed from inside the support, release the film sheet from the first film transfer plate thereby allowing the film sheet to be sucked into the support.
[0028] Preferably, the method comprises:
- during a first stage of operation, using the first film transfer plate, attach a first film sheet and heat the first film sheet while, using a second film transfer plate, releasing a second film sheet hereby allowing the second sheet to be aspirated into a first support; and
- during a second operation step by means of the second film transfer plate, attach a third film sheet and heat the third film sheet while, by means of the first film transfer plate releasing the first film sheet thereby allowing the first sheet of film to be sucked into a second support.
[0029] Preferably, the method comprises releasing the film sheet from the first film transfer plate after a preset low pressure is reached within the holder, the preset low pressure being lower than 5 kPa (50 mBar), preferably between 0.3 kPa (3 mBar) and 4 kPa (40 mBar), more preferably between 0.5 kPa (5 mBar) and 3 kPa (30 mBar), and even more preferably between 1 kPa (10 mBar) and 2 kPa (20 mBar).
[0030] Preferably, the method comprises releasing the film sheet from the first film transfer plate when a time
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Predefined 9/30 has expired, the predefined time being between 0.5 s and 2.5 s, preferably between 1 s and 2 s.
BRIEF DESCRIPTION OF THE DRAWINGS [0031] The present invention will be made clearer by reading the following detailed description, given by way of example and not by way of limitation, to be read with reference to the accompanying drawings, in which: [0032] Figures 1a and 1b they are a side view and an axonometric view, respectively, of a machine according to a preferred embodiment of the present invention;
figure 2 is a side view of a portion of the machines of figures 1a and 1b;
figure 3 is an enlarged view of a detail of figure 2;
figure 4 is a perspective view of a portion of the machine during operation;
figures 5a to 5h show several stages of the vacuum film packaging carried out by the machine, according to a first variant; and figures 6a to 6h show various stages of the vacuum film packaging carried out by the machine, according to a second variant.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION [0033] Figures 1a, 1b, 2, 3, and 4 show a machine 1 for vacuum film packaging of a product disposed on a support according to a preferred embodiment of the present invention. The corresponding parts shown in the various figures are indicated with the same reference number through the figures. Figures are not to scale.
[0034] Machine 1 preferably comprises a frame 10, a support transport set 2, a support set of
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10/30 roll 3, a film cutting set 4, a packaging set 5 and a vacuum arrangement such as a vacuum pump (not shown in the drawings) or the like.
[0035] The support transport set 2 preferably comprises a sliding plane 20 and a conveyor belt 21 arranged in slidable contact with the sliding plane 20. The support transport set 2 is fixed on the frame 10 so that the sliding plane 20 is substantially horizontal and the conveyor belt 21 slides in contact with the sliding plane 20 in the horizontal direction indicated by the arrow A1 shown in figure 1a. Next to the structure 10, the sliding plane 20 has an opening 20a (visible, for example, in figures 5a to 5h) suitable for being coupled by the packaging set 5, as will be described in further details hereinafter. Support carrier assembly 2 further comprises a stepper motor unit 22 for operating the conveyor belt 21 stepwise.
[0036] The roller support assembly 3 preferably comprises two rotating rollers 31, 32 that project horizontally from an upper part of the frame 10 and suitable for supporting a roll of film 6. Preferably, the roller support assembly 3 still comprises an arm 33 fixed to the frame 10 and suitable to prevent axial movement of the film roll 6. Furthermore, the roller support assembly 3 preferably comprises film punching devices 34 configured essentially to provide the correct profile for the edges of film, when cut transversely in the cutting set 4, with the shape of the tray mouth with rounded corners. The punching devices 34 can also help to keep an unwound portion of film 60 pulled from the film roll 6 substantially vertically aligned. Alternatively, the film can be unwound from the film roll 6 and moved to a priPetition 870200004158, of 09/01/2020, p. 26/52
11/30 first clamping roll horizontally, instead of vertically as illustrated in the figures. In such a case, the punching devices 34 can be positioned closer to the film roll 6, in the space between the film roll 6 and said first clamping roll, and rotated by 90 ° to punch the film while it is horizontal. [0037] Preferably, the film wound on the film roll 6 is made of a flexible multilayer material comprising at least a first heat sealable outer layer, an optional gas barrier layer and a second heat resistant outer layer heat. The heat-sealable outer layer preferably comprises a polymer capable of welding on the inner surface of the supports that carry the products to be packaged, such as, for example, ethylene homo or copolymers, such as LDPE, ethylene / alpha copolymers -olefin, ethylene / acrylic acid copolymers, ethylene / methacrylic acid copolymers, and ethylene / vinyl acetate copolymers, ionomers, copolyesters, for example, PETG. The optional gas barrier layer preferably comprises oxygen impermeable resins such as PVDC, EVOH, polyamides and blends of EVOH and polyamides. The heat resistant outer layer is preferably made of ethylene homo or copolymers, ethylene / cyclic olefin copolymers, such as ethylene / norbornene copolymers, homo or propylene copolymers, ionomers, (co) polyesters, (co) polyamides . The film may also comprise other layers such as adhesive layers or layers of putty to increase the thickness of the film and improve its mechanical properties. Preferably, one or more layers of the film are crosslinked to improve the strength of the film and / or its heat resistance. Cross-linking can be achieved using chemical additives or subjecting the film layers to an energetic radiation treatment. The film preferably has a thickness
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12/30 between 50 microns and 200 microns, more preferably between 60 and 180 microns and even more preferably between 70 microns and 150 microns. The film preferably has a width substantially equal to the width of the support that carries the product to be packaged. [0038] The film cutting set 4 preferably comprises a cutting device 40 with a cutting blade 401 and a first piston 41. The first piston 41 can be replaced by any other type of linear electric, pneumatic or hydraulic actuator. The first piston 41 is preferably attached to the frame 10 under the roller support assembly 3 and is connected to the cutting device 40 so as to push and pull it in the horizontal direction indicated by the double arrow A2 shown in figure 3. The film cutting assembly 4 further comprises a support block 42 and a second piston 43. The second piston 43 can be replaced by any other type of linear electric, pneumatic or hydraulic actuator. The second piston 43 is preferably fixed to the frame 10 and is connected to the support block 42 in order to push and pull it in the vertical direction indicated by the double arrow A3 shown in figure 3. The support block 42 preferably comprises a backing plate 421 having a number of holes and a backing element 422 having a slot 423. The cutting device 40 and the backing block 42 are preferably arranged so that the unwound portion of film 60 pulled from the roll of film 6 is among these.
[0039] The packing set 5 preferably comprises a rotating cylinder 50 mounted on the frame 10 and suitable for rotating around its geometric axis X as indicated by the double arrow A4 shown in figure 3. The geometric axis X preferably forms a approximately 45 ° angle to the vertical direction. The rotating cylinder 50 can be replaced by any other type of electric, pneumatic or hydraulic rotary actuator. In addition, packaging set 5
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13/30 comprises two film transfer plates 51a, 51b and two third pistons 52a, 52b. The third pistons 52a, 52b can be replaced by any other type of electric, pneumatic or hydraulic linear actuator. The third pistons 52a, 52b are connected to the rotating cylinder 50 so as to form a substantially right angle between them, that is, one of the two third pistons (for example, 52a) has its vertically oriented geometric axis and the other (for example, , 52b) has its geometric axis horizontally oriented as shown in figure 3. Each of the third pistons 52a, 52b is connected to a respective film transfer plate 51a, 51b in order to push it and pull it along the direction indicated by the double arrows A5 and A6, respectively. By rotating the rotating cylinder 50 around the geometric axis X by an angle of approximately 180 ° (either clockwise or counterclockwise), the position of the two pistons 52a, 52b and the respective film transfer plates 51a, 51b can be exchanged. Each film transfer plate 51a, 51b is preferably provided with a heatable surface 510 and with at least one opening 520 (visible in figures 5a to 5j) connected to the aforementioned vacuum pump. The transfer plates 51a, 51b are shown in the drawings as flat surfaces, according to a preferred embodiment of the present invention. However, it can also be provided to use formed transfer plates, having an internal hollow with plates around edges that correspond to the edge of the support that carries the product to be packed. This would have the advantage of also allowing the packaging of products that project from the support.
[0040] The packing set 5 preferably still comprises a base unit 53 and a fourth piston 54. The fourth piston 54 can be replaced by any other type of linear electric, pneumatic or hydraulic actuator. The fourth piston 54 is fixed to the frame
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14/30 under the sliding plane 20 and is connected to the base unit 53 in order to push and pull at least part of it in the vertical direction indicated by the double arrow A7 shown in figure 3 through the opening 20a of the sliding plane 20.
[0041] With reference to figures 5a to 5h, the base unit 53 according to a first preferred variant will be described in further details.
[0042] According to the first preferred variant, the base unit 53 preferably comprises an outer fixed element 530 and an inner slide element 531. The outer fixed element 530 has a base and a side wall that defines a central cavity. The external fixed element 530 is preferably provided with vacuum ducts 532 connected to the aforementioned vacuum pump, these can be positioned, for example, on the bottom of the external fixed element 530 or, as illustrated in figures 5a to 5h, within the thickness of the side wall of the external fixed element 530. Specifically, in the form of figures 5a to 5h, the vacuum ducts 532 are configured to match the holes placed on the side walls of a tray supported by the internal slide element 531 resting on the base of the external fixed element 530. The internal surface of the side wall of the external fixed element 530 is preferably shaped to fit the contour of the support on which the product to be packaged is arranged. The base of the external fixed element 530 has a central hole. The outer fixed element 530 is preferably attached to the frame 10 under the sliding plane 20. The inner sliding element 531 preferably has a base plate and a rod connected to the fourth piston 54 (not shown in figures 5a to 5h) and coupling the central hole in the base of the outer fixed element 530. The inner slide element 531 is slidable into the central cavity of the outer fixed element 530 by the fourth piston 54 between a
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15/30 first position (shown in figures 5a, 5b and 5h) in which its base plate engages the opening 20a of the sliding plane 20 and is substantially aligned with the sliding plane 20, and a second position (shown in figures 5c a 5g) on which its base plate rests on the base of the external fixed element 530.
[0043] The operation of machine 1 with base unit 53 according to the first variant will now be described in detail.
[0044] First, the heatable surface 510 of the film transfer plates 51a, 51b is heated to a predefined temperature. The predefined temperature is preferably between 140 ° C and 200 ° C. It is assumed that the third pistons 52a, 52b with the film transfer plates 51a, 51b are initially in the configuration shown in figure 3, that is, the third piston 52a has its vertically oriented geometric axis and the third piston 52b has its horizontally oriented geometric axis.
[0045] Then, the film cutting assembly 4 preferably begins to cut the film sheets 61 of the unwound portion of film 60 which is vertically aligned between the cutting device 40 and the support block 42. Specifically, before each cut the second piston 43 preferably pushes the support block 42 in the vertical direction indicated by the double arrow A3 shown in figure 3, until the support element 422 faces the cutting device 40. Then, the unwound portion of film 60 is pulled until it has a predefined length, preferably corresponding to the length of the supports 7. This can be done by any conventional method such as, for example, by means of an encoder, which knows the angular position of the rotating cylinder 31 and adequately controls its movement to provide the preset length of unwound film. When the unwound portion of film 60 has the predefined length, the first piston 41 preferably pushes the cutter 40 into the
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16/30 horizontal direction indicated by the double arrow A2 of figure 3, until the cutting device 40 rests against the support element 422 and the cutting blade 401 engages the slot 423, thus cutting a sheet of film 61 whose width and length are equal to the width and length, respectively, of the support 7. After the film sheet 61 has been cut, the first piston 41 preferably pulls the cutting device 40 in the horizontal direction indicated by the double arrow A2 of figure 3, by means of this by moving the cutting device 40 away from the film sheet 61 and the support element 422. Substantially at the same time, the second piston 42 preferably pulls the support block 42 down in the vertical direction indicated by the double arrow A3 shown in the figure 3, until support plate 421 faces film transfer plate 51b (as shown in figure 3). At substantially the same time, the vacuum is sucked through the holes in the backing plate 421.
[0046] While the support block 42 is pulled down, the film sheet 61 is also pulled down, since the vacuum sucked through the holes of the support plate 421 keeps the film sheet 61 integral with it.
[0047] Also, while the support block 42 is pulled down, the third piston 52b pushes the film transfer plate 51b in the horizontal direction indicated by the double arrow A6 until the film transfer plate 51b rests against the plate support 421, with the film sheet 61 disposed between them.
[0048] Then, the vacuum is applied between the heatable surface 510 of the film transfer plate 51b and the film sheet 61 by the vacuum pump through at least one opening 520 of the film transfer plate 51b, while the vacuum through the holes in the support plate 421 it is released. In this way, the film transfer plate 51b secures the film sheet 61 by adhesion, i.e., the film sheet 61 adheres to the heatable surface 510 of the transfer plate
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17/30 of film 51b. As the film sheet 61 comes into contact with the heating surface 510 (which, as mentioned above, is heated to the predefined temperature) it advantageously begins to heat and soften.
[0049] Then, while continuing to apply the vacuum between the heatable surface 510 and the film sheet 61, the third piston 52b with its horizontally oriented geometric axis preferably pulls the film transfer plate 51b along the direction indicated by double arrows A6 of figure 3, in order to move it away from the support plate 421. Due to the vacuum, the film sheet 61 advantageously still adheres to the heating surface 510.
[0050] Meanwhile, the products 8 to be packaged are placed on the respective supports 7, such as, for example, trays. Each support 7 preferably has a base, a side wall and one or more holes 70 on the side wall. The support 7 preferably has a number n of holes between 2 and 12. The diameter of the holes 70 is preferably between 0.5 mm and 3.0 mm, more preferably between 0.75 mm and 3.0 mm . Preferably, the number and size of the hole (s) is such that nA> 4 mm ² , more preferably nA> 7 mm ² , where A is the area of a single hole 70. Preferably, the holes 70 are the same size and shape. The holes 70 are preferably positioned close to the edge of the side wall, in order to reduce the risk of leakage of liquid products and / or the obstruction of the holes 70. The holes 70 are preferably evenly distributed across the side wall area. The holes 70 are preferably positioned in the corners of the side wall. This further reduces the risk of residual air pockets in the final packaging.
[0051] The supports 7 are preferably made of a single-layer or multilayer thermoplastic material that has properties
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18/30 gas barrier ages. Exemplary single layer gas barrier thermoplastic materials are (co) polyesters, (co) polyamides and the like. Preferably, in the case where a multilayer thermoplastic material is used, the multilayer thermoplastic material preferably comprises at least one gas barrier layer and at least one heat sealable layer to allow welding of the film sheet 61 on the support surface 7. The exemplary gas barrier polymers that can be used by the gas barrier layer are PVDC, EVOH, (co) polyamides, (co) polyesters and their blends. Preferably, the heat sealable layer is made of a polyolefin, such as ethylene homo or copolymers, for example, specifically polyethylene, ethylene-a-olefin copolymers, and ethylene-vinyl acetate, homo or copolymers propylene copolymers, such as ethylene-propylene copolymers and ethylene-propylene-a-olefin terpolymers, and ionomers, or homo or co-polyesters, for example PETG (a glycol modified polyethylene terephthalate). The multilayer thermoplastic material may also comprise layers of adhesive, to better adhere the gas barrier layer to the adjacent layers. It can also comprise layers of dough to provide the structure with sufficient thickness and / or with the desired mechanical properties. Chemically or physically foamed layers can be present in support 7 specifically for use as layers of dough. Other layers may also be present - as known in the art - to provide support 7 with certain desired properties, for example, suitable layers to make the final package easy to open or to make it resealable. The total thickness of the single-layer or multi-layer thermoplastic material is preferably less than 10 mm more preferably between 0.2 mm and 8.0 mm and even more preferably 870200004158, from 09/01/2020, pg . 34/52
19/30 between 0.3 mm and 7.0 mm.
[0052] The supports 7 with the products 8 arranged on them are then supported on the sliding plane 20, so that the conveyor belt 21 slides them step by step along the sliding plane 20 in the direction indicated by the arrow A1 of the figure 1A. As shown in figure 5a, one of the supports 7 with a product 8 disposed on it is sliding step by step along the sliding plane 20 under the effect of the conveyor belt 21 (not shown in figure 5a), until it reaches the opening 20a coupled by the base unit 53 and is consequently arranged on the base plate of the internal slide element 531.
[0053] While the conveyor belt 21 is bringing the support 7 on the base plate of the internal slide element 531, the rotating cylinder 50 preferably rotates 180 ° around its geometric axis X, so that the positions of the plates of film transfer 51a, 51b are exchanged. Consequently, the third piston 52b now has its vertically oriented geometry axis and the film transfer plate 51 b that secures the film sheet 61 is now above support 7 and product 8 (see figure 5b). The vacuum applied between the heatable surface 510 of the film transfer plate 51b and the film sheet 61 is symbolically represented by the arrow A8.
[0054] The internal slide element 531 is then moved downward by the fourth piston 54 in the vertical direction indicated by the arrow A7 of figure 3, until its bottom rests on the base of the external fixed element 530 (see figure 5c).
[0055] Then, while continuing to apply the vacuum between the heated surface 510 and the film sheet 61, the third piston 52 pushes down the film transfer plate 51b along the vertical direction indicated by the arrow A5 in figure 3, until the heating surface 510 engages the edge of the support 7 loaded by the external fixed element
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20/30
530 of the base unit 53 and the film sheet 61 cover the opening of the holder 7, as shown in figure 5d. Preferably, the edges of the film sheet 61 are attached to the edge of the support 7 in an airtight manner by the pressure of the film transfer plate 51 b.
[0056] Then, the air is removed from inside the support 7 by means of the vacuum pump, through the holes 70 and the vacuum ducts 532, as schematically indicated by the arrows A9 in figure 5e. This advantageously creates a vacuum (i.e., decreases the pressure) within the support 7 under the film sheet 61. It can be noted that, even if the vacuum is created under the film sheet 61, the film sheet 61 still adheres to the heated surface 510. This is due to the fact that the low pressure created between the heated surface 510 and the film sheet 61 is lower than the low pressure created under the film sheet 61.
[0057] After a predefined low pressure is reached inside the support 7 under sheet of film 61 (typically in the range up to 50 mBar, preferably between 3 and 40 mBar, more preferably between 5 and 30 mBar and even more preferably in the range of 10-20 mBar), air is reintroduced between the heated surface 510 and the film sheet 61 through at least one opening 520 of the film transfer plate 51b, as indicated by the arrow A8 'of figure 5f. The air can be reintroduced either immediately after the preset low pressure is reached, or after a preset extra time. Alternatively, air is reintroduced when a predefined time has expired (typically between 0.5 and 2.5 s and preferably between 1 and 2 s). The film sheet 61 then stops adhering to the heating surface 510 and is sucked down by the vacuum inside the support 7. While the film sheet 61 is sucked down, the vacuum pump preferably continues to remove air from the support 7 through holes 70. Advantageously, film sheet 61 moving down into holder 7 helps air to exit holder 7 through holes 70. As film sheet 61 is
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21/30 heated (and then softened), under the effect of the vacuum inside the support 7 it deforms in order to adhere in the product 8 and in the internal surface of the support 7, as shown in figure 5f. The removal of air from inside the support 7 can advantageously continue until the holes 70 are not closed by the film sheet 61. As soon as the film sheet 61 closes the holes 70 adhering on the internal surface of the support 7 along a closed line surrounding such holes 70, the removal of air from inside the support 7 is prevented. When the removal of air from inside the support 7 is prevented, the evacuation of the package ends.
[0058] The film transfer plate 51b is then pulled in the vertical direction indicated by the arrow A5 in figure 3 by the third piston 52b, thereby moving it away from the base unit 53 (see figure 5g).
[0059] The vacuum is released under the support 7 and then the fourth piston 54 preferably pushes the internal slide element 531 of the base unit 53 in the vertical direction indicated by the arrow A7 of figure 3, until the internal slide element 531 is again substantially aligned with the sliding plane 20 (see figure 5h). In this way, the support 7 can continue to slide step by step along the sliding plane 20 in the horizontal direction indicated by the arrow A1 under the effect of the conveyor belt 21.
[0060] The operation of a single 51 b film transfer plate has been taken into account in the description above. However, in machine 1 the two film transfer plates 51a, 51b are operated simultaneously. Its operation is preferably synchronized as follows.
[0061] While the film transfer plate 51b is involved in the operations of figures 5d to 5f (that is, it is in contact with the base unit 53), the film cutter assembly 4 cuts an additional film sheet as described above (the support block 42 is pushed upwards until the support element 422 faces the device
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22/30 cutting device 40, the cutting device 40 is pushed horizontally against the support element 422 thus cutting the additional film sheet, the cutting device 40 is moved away from the support element 422 and the support block 42 is pulled down until the backing plate 421 faces the film transfer plate 51a), the film transfer plate 51a is pushed against the backing plate 421 with the additional film sheet disposed between them, the vacuum is applied between the heatable surface of the film transfer plate 51a and the additional film sheet so that the film transfer plate 51a holds the additional film sheet, and the film transfer plate 51a holding the additional film sheet is moved away support plate 421.
[0062] Subsequently, the film transfer plate 51 b is preferably moved away from the base unit 53 (figure 5g) and the support 7 is raised at the level of the sliding plane 20 (figure 5h). Then, with a single step of the stepper motor unit 22, the conveyor belt 21 removes the support 7 from the base unit 53 and brings an additional support with an additional product on the inner slide element 531 of the base unit 53. The support additional is brought over the internal slide element 531 and said element 531 is lowered, while the rotating cylinder 50 preferably rotates by an angle of approximately 180 ° around its geometric axis X, thereby changing the positions of the transfer plates of film 51a, 51b. The heating surface 510 is then lowered to couple the edge of the support 7 loaded by the external fixed element 530 of the base unit 53. Consequently, the film transfer plate 51a that holds the additional film sheet is now above the additional support. The operations shown in figures 5d to 5h are then repeated to provide an additional packaged product according to the vacuum film packaging technique.
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23/30 [0063] The operation of machine 1 cyclically repeats according to the above timing, thereby implementing the vacuum film packaging on a number of supports 7 with the respective products 8 mounted on them that are sequentially provided by on the sliding plane 20.
[0064] The machine described above has a number of advantages.
[0065] First of all, the provision of holes 70 in the support 7 advantageously allows to remove the air from inside the support 7 under the film sheet 61 even after the paper film 61 is brought in airtight contact with the edges of the support 7. This advantageously allows to remove more air from inside the support 7, thereby minimizing the amount of residual air left inside the support 7 at the end of the vacuum film packaging process, and consequently minimizing the risk of forming air pockets.
[0066] Furthermore, this allows to continue to remove the air from the support 7 even after the film sheet 61 is released from the heatable surface 510 of the film transfer plate 51 b. This advantageously allows to reduce the residual amount of air inside the package at the end of the vacuum film packaging process.
[0067] Still, this allows to provide a much simpler and more compact machine, since the vacuum chamber required to allow the extraction of air from inside the support 7 is very simple. Indeed, thanks to the holes 70, the film sheet 61 can be fixed airtight on the edges of the support 7 before starting to extract air from the support
7. In other words, the film transfer plate 51 and the outer fixed element 530 form a vacuum chamber.
[0068] In addition, the film transfer plates 51a, 51b advantageously allow first to cut the film sheet 61 and subsequently transfer the film sheet 61 to the position above the product 8 and the support 7. In this way, no excess of film is
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24/30 required to allow the film to be pulled from the film roll 6 and secured in place above the product 8. Furthermore, this advantageously allows to provide a film cutting set 4 separate from the packaging set 5. The cutting set of film 4 is advantageously very simple, since it performs the cuts in the ambient temperature and pressure. No complicated solution is required to perform the cuts in extreme conditions such as very high temperatures or very low pressures. The packaging set 5 is also advantageously very compact, as it does not need to include any cutting device. The resulting machine 1 is therefore simpler and more compact than the known machines.
[0069] Furthermore, thanks to the presence of two alternating film transfer plates 51a, 51b, the processing of consecutive media 7 is partially overlaid over time, giving a higher productivity.
[0070] Advantageously, the presence of two alternating film transfer plates 51 increases the heating time of the film sheet 61 (i.e., the time during which the film sheet 61 is in contact with the hot plate of a film transfer plate 51a, 51b). Actually, the heating of the film sheet 61 starts when a film transfer plate (for example, 51b) holds the film sheet 61 by adhesion, it continues while the film transfer plate 51b is moved away from the backing plate 421 , while the rotating cylinder 50 rotates thus changing the position of the film transfer plates 51a, 51 b while the film transfer plate 51b is pushed in contact with the base unit 53 and while the air is extracted from inside the holder 7 This time is much longer than the warm-up time allowed by known machines. Therefore, advantageously, the predefined temperature at which the heating surfaces 510 of the transfer plates
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25/30 of film 51a, 51b are heated may be lower than in prior art machines.
[0071] With reference to figures 6a to 6h, the base unit 53 'according to a second preferred variant will be described in further details.
[0072] According to the second preferred variant, the base unit 53 'preferably comprises an outer element 530', a fixed base plate 531 'and an adapter 532' with four leveling feet 533 '. The fixed base plate 531 'is connected to a fixed rod 540 of the third piston 54 and has four through holes (not visible in the drawings). The adapter 532 'rests on the fixed base plate 531' with the four leveling feet 533 'coupling the through holes and projecting on the underside of the fixed base plate 53T. In an alternative embodiment not shown in the drawings, adapter 532 'can be configured so that when it rests on the fixed base plate 53T, the four leveling feet 533' are external to the fixed base plate 531 'and these project on the underside of the 53T fixed base plate. The fixed base plate 531 'and the adapter 532' couple the opening 20a of the sliding plane 20 so that the upper surface of the adapter 532 'is aligned with the sliding plane 20. The outer element 530' has a base and a side wall that defines a central cavity. The base has one or more vacuum holes (not shown in the drawings) suitable for connecting the central cavity with the vacuum pump. The central cavity of the outer element 530 'is preferably dimensioned to allow the fixed base plate 531' and the adapter 532 'to slide into the central cavity. The base of the outer element 530 'is preferably connected to a movable cylinder 541 of the third piston 54.
[0073] The operation of machine 1 with the base unit 53 'according to the second variant will now be described in detail. Co
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26/30 m the operations that do not involve the base unit 53 'are substantially the same as the corresponding operations performed by the machine with the base unit 53 according to the first variant, such operations will only be briefly summarized, while a description detailed will not be repeated.
[0074] First, the heatable surface 510 of the film transfer plates 51a, 51b is heated to a predefined temperature. Then, the film cutting assembly 4 preferably begins to cut the film sheets 61 of the unwound portion of film 60 as described above (before each cut, the support block 42 is pushed upwards until the support element 422 face the cutting device 40, the cutting device 40 is horizontally pushed against the support element 422 thus cutting a sheet of film 61, the cutting device 40 is moved away from the support element 422 and the support block 42 is pulled down until the backing plate 421 faces the film transfer plate 51b). Then, the film transfer plate 51b is pushed against the backing plate 421 with the film sheet 61 disposed between them, the vacuum is applied between the heatable surface of the film transfer plate 51b and the film sheet 61 so that the film transfer plate 51b secures the film sheet 61, and the film transfer plate 51a securing the film sheet 61 is moved away from the backing plate 421.
[0075] Meanwhile, the products 8 to be packaged are arranged on the respective supports 7 with one or more holes 70 on their side walls. The supports 7 with the products 8 arranged on them are then supported on the sliding plane 20, so that the conveyor belt 21 slides them step by step along the sliding plane 20 in the direction indicated by the arrow A1 of figure 1a.
[0076] As shown in figure 6a, one of the supports 7 with a
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27/30 The product disposed on it (not visible in figure 6a) is sliding along the sliding plane 20 under the effect of the conveyor belt 21 (not shown in figure 6a), until it reaches the opening 20a coupled by the base unit 53 'and consequently stay on the adapter 532'.
[0077] While the conveyor belt 21 is bringing support 7 over adapter 532 ', the rotating cylinder 50 preferably rotates 180 ° around its geometric axis X, so that the positions of the film transfer plates 51a, 51b are exchanged. Consequently, the third piston 52b now has its vertically oriented geometry axis and the film transfer plate 51b that secures the film sheet 61 is now above support 7 and product 8 (see figure 6b).
[0078] The outer element 530 'and then moved upwards in the vertical direction indicated by the arrow A7 of figure 3 by the movable cylinder 541 of the fourth piston 54, until the outer element 530' touches the edge of the support 7 and the leveling feet 533 'of adapter 532' rest on the base of the outer element 530 '(see figure 6c).
[0079] Then, the outer element 530 'is additionally moved upwards in the vertical direction indicated by the arrow A7 of figure 3 by the movable cylinder 541 of the fourth piston 54, thus raising the adapter 532' (and the support 7 that rests on it) and detaching it from the 53T fixed base plate. The travel of the outer element 530 'ends when the fixed base plate 531' rests against the base of the outer element 530 '(see figure 6d).
[0080] Then, the film transfer plate 51b that holds the film sheet 61 is pushed down until the film sheet 61 covers the opening of the holder 7 (as shown in figure 6e), the edges of the film sheet 61 being fixed to the edge of support 7 in an airtight mode.
Petition 870200004158, of 01/09/2020, p. 43/52
28/30 [0081] Then, the air is removed from inside the support 7 through the holes 70 and the vacuum holes of the external element 530 'to create a vacuum inside the support 7 under the film sheet 61. When a low pressure predefined is reached inside the support 7 under the film sheet 61, the film sheet 61 is released and is sucked down by vacuum inside the support 7. As the film sheet 61 is heated (and then softened), under the effect the vacuum inside the support 7 is deformed in order to adhere to the product 8 and to the internal surface of the support 7 (not shown in the figures).
[0082] After reventilation through the film transfer plate 51b, the film transfer plate 51b is pulled in the vertical direction indicated by the arrow A5 of figure 3 by the third piston 52b, thereby moving it away from the base unit 53 (see figure 6f), and the vacuum inside the outer element 530 'is released.
[0083] Then, the outer element 530 'is moved downwards in the vertical direction indicated by the arrow A7 of figure 3, by the movable cylinder 541 of the fourth piston 54, thus lowering the adapter 532' (and the support 7 that rests on it) and bringing it back in contact with the fixed base plate 531 '(see figure 6g).
[0084] The outer element 530 'is then further moved downwards in the vertical direction indicated by the arrow A7 of figure 3 by the movable cylinder 541 of the fourth piston 54, until the outer element 530' decouples the opening 20a from the sliding plane 20 and the support 7 (see figure 6h). In this way, the support 7 can continue to slide along the sliding plane 20 in the horizontal direction indicated by the arrow A1 under the effect of the conveyor belt 21.
[0085] Also according to this second variant, the film transfer plates 51a, 51b can be operated according to the timing described above.
[0086] Machine 1 incorporates the base unit 53 'according to
Petition 870200004158, of 01/09/2020, p. 44/52
29/30 with the second variant has the same advantages as the machine 1 which incorporates the base unit 53 according to the first variant, that is: minimizing the risk of forming air pockets, less residual air inside the packaging in the end of the vacuum film packaging process, the use of a simpler vacuum chamber, no excess film required to allow the film to be pulled from the film roll 6 and held in place above the product 8, simplicity of the set cutting film 4 and packaging set 5, increased productivity, and increased heating time of film sheet 61.
[0087] In addition to the above advantages, the base unit 53 'according to the second variant advantageously allows to adapt the machine 1 for use with a variety of supports of different types in a very simple way.
[0088] In fact, as can be seen in figures 6c to 6g, the packaging set 5 that incorporates the base unit 53 'operates properly if the total height of the adapter 532' with the leveling feet 533 'and the support 7 is equal to the height of the central cavity of the outer element 530 '. Therefore, in case the machine is first used to pack first products on a first type of supports that have a first height, and successively the machine should be used to pack second products on a second type of supports that have a second height, the machine 1 can be adapted for use with the supports of the second type simply by changing adapter 532 by a new adapter that has leveling feet with the appropriate height. If the leveling feet 533 'of the adapter 532' are adjustable, adaptation is performed simply by adjusting the leveling feet 533 '. Both operations (changing the adapter or adjusting its leveling feet) are advantageously very simple, since the adapter is
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30/30 supporting you on the fixed base plate 53T, and consequently can be removed from the base unit 53 'and mounted on the base unit 53' in a very easy way.
[0089] Alternatively, instead of a continuous film of the appropriate width which is cut into sheets of film at the predefined length that matches the tray mouth, it is also possible to use pre-cut sheets of film of the appropriate dimensions (width and length ). Said pre-cut film sheets can be stacked and removed, one at a time, by the film transfer plates 51a, 51b and used in the packaging process described above. In such a case a suitable configuration of the packaging set 5 (not shown in the drawing) can provide that the film transfer plates 51a, 51b are arranged parallel to the base unit 53 and that they are moved vertically by relative pistons that allow said film transfer plates 51a, 51b are raised and lowered as needed. The pistons can be connected to a cylinder that rotates around a vertical geometric axis, in order to horizontally move the pistons with the film transfer plates 51a, 51b. This alternative packaging set can perform the following steps: lower the first film transfer plate (designated 51a above) onto the stack of pre-cut film sheets, apply a vacuum through the first film transfer plate 51a to pick up the top film sheet of the stack, raise the first film transfer plate 51a with the pre-cut film sheet adhered to it, rotate the cylinder by a suitable angle to bring said first film transfer plate 51a over a base unit 53 and at the same time a second film transfer plate 51b on the stack of precut film sheets, and lower the first film transfer plate 51a to perform a vacuum film packaging process as described above.
Petition 870200004158, of 01/09/2020, p. 46/52
1/5

权利要求:
Claims (11)
[1]
1. Machine (1) for vacuum film packaging of a product (8) disposed on a support (7), said support (7) having a side wall with at least one hole (70), said machine (1 ) characterized by the fact that it comprises:
a first film transfer plate (51a) configured to hold a film sheet (61), heat said film sheet (61), bring said film sheet (61) to a position above said support (7) with said product (8) disposed thereon and securely fixing said film sheet (61) in said support (7); and a vacuum arrangement for removing air from said support (7) under said film sheet (61) through said at least one hole (70), said first film transfer plate (51a) being configured to release said film sheet (61) hereby allowing said film sheet (61) to be sucked into said support (7) while said vacuum arrangement (7) is removing air from said support (7);
the machine additionally comprising:
a roll support assembly (3) configured to support a roll of film (6) from which said film sheet (61) is cut;
a cutting device (4) having a cutting blade (401) suitable for cutting said film sheet (61) from said film roll (6) and a backing plate (421) suitable for retaining said film sheet (61) after it has been cut, said support plate (421) has a number of holes suitable for vacuuming allowing the retention of said film sheet (61);
and wherein said first film transfer plate (51a) is configured to rest against said support plate (421) with said film sheet (61) disposed between them and to move said sheet
Petition 870200004158, of 01/09/2020, p. 47/52
[2]
2/5 film (61) away from said support plate (421) by adhesion.
Machine (1) according to claim 1, characterized by the fact that it still comprises a second film transfer plate (51b), said first film transfer plate (51a) and said second film transfer plate (51a) film (51b) being arranged so that:
during a first operating stage of said machine (1), said first film transfer plate (51a) holds a first film sheet and heats said first film sheet, while said second film transfer plate ( 51b) releases a second sheet of film thereby allowing said second sheet to be aspirated into a first support; and during a second operating step of said machine (1), said second film transfer plate (51b) holds a third film sheet and heats said third film sheet, while said first film transfer plate (51a) releases said first film sheet thereby allowing said first film sheet to be aspirated into a second support.
[3]
Machine (1) according to claim 2, characterized by the fact that it also comprises a rotating cylinder (50) suitable for rotating around its geometric axis X, said first film transfer plate (51a) and the said second film transfer plate (51 b) being connected to said rotating cylinder (50) so that, when said rotating cylinder (50) rotates about its geometric axis X, the positions of said first transfer plate of film (51a) and said second film transfer plate (51b) are exchanged.
[4]
4. Machine (1) according to any one of the preceding claims, characterized in that said first film transfer plate (51a) has an opening (520) connected to said
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3/5 vacuum arrangement, said opening (520) allowing to vacuum the vacuum while said first film transfer plate (51a) is holding said film sheet (61) and allowing to reintroduce air thereby inducing with that said first film transfer plate (51a) releases said film sheet (61).
[5]
Machine (1) according to any one of the preceding claims, characterized in that it still comprises a base unit (53) suitable for supporting said support (7) while said film sheet (61) is aspirated to inside said support (7).
[6]
Machine (1) according to claim 5, characterized in that said base unit (53) comprises an external fixed element (530) and an internal slide element (531), said internal slide element (531 ) being suitable to support said support (7), said external fixed element (530) having one or more vacuum ducts (532) formed in its thickness and connected in said vacuum arrangement, said vacuum ducts (532) being in connection with said at least one hole (70) when said support (7) rests on said internal slide element (531) and said internal slide element (531) engages a cavity of said external fixed element (530) .
[7]
Machine (1) according to claim 5, characterized in that said base unit (53) comprises an external element (530 '), a fixed base plate (53Γ) and an adapter (532') with a number of leveling feet (533 '), said adapter (532') being suitable for supporting said support (7) and resting on said fixed base plate (53Γ) with the number of leveling feet (533) ') projecting on a lower side of said fixed base plate (53Γ), said external element (530') having a base and a side wall that defines a central cavity, said central cavity of the
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4/5 said outer element (530 ') being dimensioned to allow said fixed base plate (53Γ) and said adapter (532') to slide into said central cavity.
[8]
8. Method for vacuum film packaging of a product (8) disposed on a support (7) using the machine as defined in claim 1, said method characterized by the fact that it comprises:
providing at least one hole (70) in a side wall of said support (7);
providing a film sheet (61);
by means of a first film transfer plate (51a, 51b), hold said film sheet (61), heat said film sheet (61), bring said film sheet (61) to a position above the said support (7) with said product (8) disposed thereon and securely fixing said film sheet (61) to said support (7);
removing air from said support (7) under said film sheet (61) through said at least one hole (70); and while said air is removed from within said support (7), releasing said film sheet (61) from said first film transfer plate (51a, 51b) thereby allowing said film sheet (61 ) is aspirated into said support (7).
[9]
9. Method according to claim 8, characterized by the fact that it comprises:
during a first stage of operation, by means of said first film transfer plate (51a), holding a first sheet of film and heating said first film sheet while, by means of a second film transfer plate (51b) , releasing a second sheet of film thereby allowing said second sheet to be aspirated into a first support; and during a second stage of operation through said
Petition 870200004158, of 01/09/2020, p. 50/52
5/5 second film transfer plate (51b), attach a third film sheet and heat said third film sheet while, through said first film transfer plate (51a), releasing said first film sheet hereby allowing said first sheet of film to be aspirated into a second support.
[10]
Method according to claim 8 or 9, characterized in that it comprises releasing said film sheet (61) from said first film transfer plate (51a, 51b) after a predefined low pressure is reached within said support (7), said predefined low pressure being lower than 5 kPa (50 mBar), preferably between 0.3 kPa (3 mBar) and 4 kPa (40 mBar), more preferably between 0.5 kPa (5 mBar) and 3 kPa (30 mBar), and even more preferably between 1 kPa (10 mBar) and 2 kPa (20 mBar).
[11]
Method according to claim 8 or 9, characterized in that it comprises releasing said film sheet (61) from said first film transfer plate (51a, 51b) when a predefined time has expired, said predefined time being between 0.5 s and 2.5 s, preferably between 1 s and 2 s.
Petition 870200004158, of 01/09/2020, p. 51/52
1/13

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同族专利:

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公开号 | 公开日

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RU2494935C1|2013-10-10|

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AU2010277579A1|2012-03-01|

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RU2012105423A|2013-09-10|

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EP2459448B1|2015-01-14|

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WO2011012652A1|2011-02-03|

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BR112012001894A2|2016-03-15|

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IN2012DN00668A|2015-08-21|

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US20120204516A1|2012-08-16|

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CN102574591A|2012-07-11|

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US20180170595A1|2018-06-21|

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ES2534836T3|2015-04-29|

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CN102574591B|2014-09-24|

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EP2459448A1|2012-06-06|

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NZ597663A|2014-03-28|

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AU2010277579B2|2014-11-06|

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法律状态:
2018-11-27| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|

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2019-01-15| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-10-15| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|

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2020-02-27| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-04-22| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/07/2010, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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EP09166750|2009-07-29|

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PCT/EP2010/060967|WO2011012652A1|2009-07-29|2010-07-28|Vacuum skin packaging of a product arranged on a support|

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