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    • 专利摘要:
    summary patent of invention: "device for printing cans, a process for printing cans, a printed can and a transfer blanket". the present invention relates to a device (1) for printing cans (8) with different printing patterns in the same production sequence, without the need to interrupt production. another objective of the present invention is to provide a process for producing cans, which uses a printing device (1), the can (8) produced by the device and process, and a transfer mat (5a-5l) which is a graphic medium which influences the final printing patterns of the cans (8) to be printed. 23471694v1 1/1 23471694v1
    公开号:BR112015000038A2
    申请号:R112015000038
    申请日:2013-03-05
    公开日:2019-10-01
    发明作者:L Lewis Jeffrey；André Vilas Boas João
    申请人:Rexam Beverage Can South America S A；
    IPC主号:
    专利说明:

    Invention Patent Descriptive Report for DEVICE FOR PRINTING CANS, A PROCESS FOR PRINTING CANS, A PRINTED CAN AND A TRANSFER BLANKET.
    DESCRIPTION
    FIELD OF TECHNIQUE [001] The present invention relates to a device for printing cans, especially aluminum cans that have more than one final art on their surface. The invention also relates to a process for printing the respective can, as well as the can obtained by this printing process.
    BACKGROUND OF THE INVENTION [002] Currently, beverage or liquid packaging cans have prints on their outer surface, mainly due to the fact that the contents of the can need to be communicated to the consumer because there is a market need for printing in different colors .
    [003] The most common type of printing performed on the cans is the type of dry rotary offset which is made by a specific printer for this purpose.
    [004] This type of printing allows someone to apply a plurality of colors over cans that are metallic, preferably made of aluminum or steel. Such printing is performed on the cans during their manufacturing process, which consists of a sequence of cutting, mechanical formation, the printing itself and the subsequent formation, until the can reaches its final desired shape to receive the liquid content and the corresponding closure.
    [005] Of course, the steps to which the cans are subjected in the manufacturing process will not be described in the present specification, since the object of the invention in question is directed to the very im-
    2./2.0 pressure.
    [006] In any case, a printing device or a printer like this is usually known, can be seen in Figure 1.
    [007] The device 1 of Figure 1 is composed of a plurality of components, in which six ink cartridges 2a-2f are present, which are supplied with ink that will be applied over the surface of the can for the purpose of printing a certain color on said surface.
    [008] Thus, it is necessary that the printing device be provided with a 2a-2f ink cartridge for each of the colors to be applied over the cans, that is, if a can must be printed with three colors, namely , black, red, and white, three of the six ink cartridges 2a-2f must be supplied with the necessary dye. It should be noted that in this type of equipment there is a limitation on the number of colors to be applied in can printing which is linked to the number of available ink cartridges. In other words, if there is an interest in printing, for example, ten different colors over the can, it is necessary that the printing device must have at least ten containers of ink 2a-2f.
    [009] The ink containers 2a-2f, in turn, supply the ink for the transfer or printing plates 3a-3f, which have the final art to be printed over the can. This final artwork can be a text, a picture or any type of graphic that someone wants to make on a can, in which it is of the utmost importance to position the printing plate correctly, so that it receives the ink from the ink cartridge. For this purpose, the printing plate, for example 3a, which is generally produced from a magnetic material, has a precise alignment on the plate cylinder 4a.
    [0010] This alignment is obtained from the guide holes that exist in the
    3/29 printing plate (not shown in the figure), which are aligned with guide pins on the plate cylinder 4a, which in turn is formed by a substantially cylindrical body, on which the printing plate wraps its outer surface in an aligned and well fixed mode. This is possible because the outer surface of the plate cylinder is formed by magnets that attract said printing plate 3a and hold it in the desired position.
    [0011] It is also important to highlight that the final art present on the printing plate 4a is in relief, so that it transfers the ink supplied by the ink cartridge 2a to a transfer mat 5a. This transfer mat 5a is a means of transferring ink between the printing plate 3a and the can to be printed.
    [0012] Thus, the relief on the printing plate 3a that has the final art comes into contact with the transfer mat 5a, thus transferring only the ink that is present in it to said transfer mat 5a. This is done by rotating the printing plate 3a, which transfers the ink present in the relief to the transfer mat 5a, which is fixed on the transfer mat drum 6, which is a device with rotation synchronized with (i ) the cans to be printed, (ii) the positioning of the transfer blankets 5a-5l that are on the surface of such transfer blanket drum 6, and (iii) the printing plates 3a-3f.
    [0013] Indeed, if there is a synchronization between these elements, it is possible that the cans are printed in a very precise way. This is of the utmost importance for printing cans, as there is no overlap of printing on the can when it receives more than one final art on its surface. In other words, the final artwork of a first printing plate 3a will transfer ink only to a specified area of the transfer blankets 5a-5l, whereby a second printing plate 3b-3f transfers
    4/29 will laugh the ink present only on its surface to another area that does not receive the ink from the first printing plate 3a, and so on. Of course, this depends on the number of printing colors on the cans.
    [0014] Thus, there is the possibility of printing the entire surface of the can, without overlapping the ink, which would impair the printing of the can in this type of rotary dry offset printing, since such an overlap would cause a printing defect, for example stains .
    [0015] In this respect, it should be emphasized that there is a transfer of more than one final art with a different color to one or more of the transfer mat 5a-5l present on the transfer mat 6 of the respective printing plates 3a -3f that are in communication with the respective ink cartridges. With this, as for the continuous rotation of the transfer blanket drum, the latter comes into contact with the cans to be printed from the transfer blankets positioned there.
    [0016] It is reiterated that each of the transfer blankets 5a5I can receive, on its surface, a plurality of different colors that come from more than one printing plate 3a-3f, but the transfer blankets 5a-5l have none overlapping artwork with different colors.
    [0017] The cans to be printed can even be colored, but when they are examined in detail it can be seen that with this type of printing there is no color overlap. Despite the proximity of the different colors that are on the surface of the can, there will always be a small space between the printing of different colors.
    [0018] It is also important to note that when it is desired to change the final art present on the cans being printed, it is necessary to interrupt production, that is, the printing device 1 must
    5/29 must necessarily be stopped, so that it can no longer print the cans. Such a stop is necessary, as there may be a need to change the print color of the can, or change a can to a different product. For example, when a type of can printing is being carried out and you want to change the final art on the cans, it is necessary to interrupt the printing process. In short, with the existing process and equipment, it is only possible to get a type of final art printed on the can with the same printing device. If it is necessary to change the printing on the can, production will necessarily need to be stopped, which for economic reasons should be minimized as much as possible.
    [0019] This can be easily seen through the order of magnitude of can printing, which is very significant. With today's equipment, approximately 2.5 million cans can be printed in a single day.
    [0020] Thus, at present, there are a number of studies aimed at minimizing, as much as possible, the stops of this type of equipment, so that production is not interrupted. It is noted that these stops are, as a rule, mandatory, because the same production line is destined for cans with the most varied final arts, for example, a can destined for beer or soft drink.
    [0021] In turn, in the face of the significant amount of can production and the substantial printing speed, the cans that have been printed are packaged for delivery to the can manufacturers' customers. So, as an example, when there is a production of a given type of can, the cans produced are packed in pallets, where each pallet has approximately 6,000 to 15,000 units of printed cans, and all of them with the same print, this it is, with the same final artwork printed on these.
    6/29 [0022] Thus, the customers of the can manufacturers, mainly the companies that produce drinks, receive shipments of pallets with an expressive number of cans, which follow the production line of this type of company which will fill the drinks of can and supply them to wholesalers, such as supermarkets. In other words, supermarkets will also receive a large number of cans with drinks that have the same artwork printed on them.
    [0023] In order to show an example of this, you can see in Figure 2 the size of a standard pallet that contains approximately
    8,500 cans. As you can see in this figure, there is a man of medium height next to the platform that contains the cans. In this way, it is possible to have a very significant idea of the number of cans being produced by a production line (it must be repeated: 2.5 million cans per day). Following this understanding, someone will admit that the logistics present in the distribution and production of cans is significant.
    [0024] However, as stated before, the same sequence of production of cans necessarily has the same printing arrangement, that is, the cans are virtually identical.
    [0025] If there is an intention to make the cans with different printing arrangements, it is necessary, in the prior art, to interrupt the production line in order to change the printing plates 3a-3f.
    [0026] In this regard, it is recalled that the beverage market is greatly influenced by the marketing of companies in another segment. Thus, the printing or final art provisions on the cans can be considered extremely important for such companies. This is because the consumer is often influenced to buy a given product by the visual aspect brought about by printing on the cans.
    7/29 [0027] This influence on the consumer's decision has put more and more pressure on the marketing sectors of the beverage companies, as these require the launch of new different printing arrangements. However, despite the effort in these sectors, the professional performance in this segment has a significant limitation in its creation, namely, due to the fact that the same type of drink produced in the same series (in the can production or in the product packaging) necessarily always has the same artwork. This is not related to the limitation of the professionals involved in creating the layout or print layout of the cans, but to the fact that the same series production without interruption necessarily has the same impression.
    [0028] The present invention is provided to solve the problems discussed above and other problems, and to provide advantages and aspects not provided by prior art devices of this type. A full discussion of the features and advantages of the present invention is given to the following detailed description, which proceeds with reference to the accompanying drawings.
    SUMMARY OF THE INVENTION [0029] The invention in question relates to a can printing device that has a number of ink cartridges that depends on the need for colors to be printed on the cans. These ink cartridges supply ink to a number of printing plates that have finished art and that will give the cans colorful shapes and printing arrangements.
    [0030] Such printing plates that have final gears are attached to the respective plate cylinders, in order to communicate with the transfer blankets fixed in a transfer blanket drum to supply the ink, whereby this ink comes from the cartridges of ink.
    [0031] So the transfer blankets are, in turn, moved
    8/29 to transfer the ink from the ink cartridges to the cans, each of the transfer blankets having respective final gears in low relief and free of ink from the ink containers.
    [0032] Furthermore, it is an objective of the invention to provide a process for the production of cans using the printing device described above. The steps in this process are (i) supplying the ink from the ink containers to the printing plates present on the respective plate cylinders; (ii) supply the ink from the printing plates to the transfer sheets by rotating the printing plates; (iii) transfer the ink from the transfer blankets to the cans; and (iv) forming the final low-relief gears present in the transfer blankets on the cans.
    [0033] Other features and advantages of the invention will be apparent from the following specification taken in conjunction with the following drawings.
    BRIEF DESCRIPTION OF THE DRAWINGS [0034] To understand the present invention, it will now be described as an example, with reference to the accompanying drawings in which:
    [0035] Figure 1 is a view of the prior art printing device;
    [0036] Figure 2 is a schematic view of a dais compared to a man of average height;
    [0037] Figure 3 is a perspective view of the printing device of the present invention;
    [0038] Figure 4 is a perspective view of internal details of the printing device of the present invention;
    [0039] Figure 5 is an enlarged perspective view of internal details of the printing device of the present invention;
    [0040] Figure 6 is an enlarged perspective view of details
    9/29 internal to the printing device of the present invention;
    [0041] Figure 7 is a perspective view of a set of transfer blankets;
    [0042] Figure 8 is a perspective view of a set of cans printed according to the present invention;
    [0043] Figures 9 to 16 are alternative versions of Figures 1 to 8, respectively;
    [0044] Figure 17 is a top and cross sectional view of a transfer blanket showing zones A, B, and C;
    [0045] Figure 18 is an enlarged view of zone A of Figure 17;
    [0046] Figure 19 is an enlarged view of zone A of Figure 17;
    [0047] Figure 20 is an enlarged view of zone A of Figure 17;
    [0048] Figure 21 is an enlarged view of zone B of Figure 17;
    [0049] Figure 22 is an enlarged view of zone B of Figure 17;
    [0050] Figure 23 is an enlarged view of zone B of Figure 17;
    [0051] Figure 24 is a photograph of three cans sequentially produced according to the principles of the present invention; and [0052] Figures 25A to D are front views of blankets of the present invention, and [0053] Figure 26 is a perspective view of an ink printing plate affixed to a plate cylinder on which substantially a whole of the ink surface the printing plate is embossed.
    DETAILED DESCRIPTION [0054] Although this invention is susceptible to modalities in many different forms, it is shown in the drawings and the preferred modalities of the invention will be described in detail here with the understanding that the present description should be considered as an example of the principles of the invention and it is not intended to limit the broad aspect of the invention to the illustrated modalities.
    10/29 [0055] The object of Figure 1 was described above in the explanation of the prior art. However, it is important to emphasize that the invention in question is applied to a can printer, that is, a printing device 1. The invention also relates to a modification made to such equipment, which allows someone to print different final arts on the cans, this impression happening without interruption of production.
    [0056] In this way, it is possible to obtain, at the end of the can production line, decks with different final art or printing arrangements, that is, instead of having the same sequence of production of cans with the same prints, it is possible to have cans with different printing arrangements, which has a substantially significant commercial effect. This is because it is possible for the same commercial establishment to receive cans that contain, for example, the same product, but in cans which are different from each other.
    [0057] This becomes very important because there is a possibility of a wide range of different creations for the marketing sectors of the companies that produce drinks. Thus, for example, if there is a particular promotion or festival of great magnitude, the object of the present invention allows the production of cans of the same production series, that is, sequentially and continuously manufactured, with different printing arrangements, such as, for example, cartoons, animal drawings, names of people, names of countries, or even sports activities. In summary, the printing or final art arrangements can be of different types and basically depend on the respective creator of the can creator, since in the light of the present invention, there is no longer any technical limit that requires the interruption of printing to provide cans with different printing arrangements or final artwork from the same uninterrupted production sequence.
    11/29 [0058] The printing device 1 can be seen in greater detail in Figure 3, which shows a can chain 7 which has a plurality of cans 8 which are fixed to said can chain 7 in a rotating mode. In the left portion of this Figure 3, you can see the cans 8 that come from the initial production processes, mainly from the mechanical forming processes. These cans pass through a first steering wheel 9 and then through a second steering wheel 10. In this way, with the aid of the other elements of the equipment, not described or presented, it is possible to direct the cans 8 retained in the can chain 7 so that they will be conveyed to the can loading device or can indexer 11.
    [0059] In cans indexer 11, they are then moved in a circle around said indexer 11. Although cans 8 are retained in the chain of cans 7, they will still have the possibility to rotate around their main geometric axes, this that is, a central longitudinal geometric axis around which the can is formed.
    [0060] In the right portion of Figure 3, eight ink cartridges 2a-2h can be seen, positioned in a half moon arrangement, which follow the same central axis 12. It can be noted that, in this embodiment of the invention, there is a limited number of ink containers, but it is important to note that this is a design option, and there may be a greater or lesser number of ink cartridges 2.
    [0061] In Figure 4, which shows the right portion of Figure 3, the interior of the printing device can be seen in greater detail
    1. The central axis 12 is, in fact, the transfer mat drum 6, which has a radial arrangement of the ink cartridges 2a-2h close to part of this perimeter.
    [0062] However, ink cartridges 2a-2h do not rest on the transfer blanket drum 6, since between each tin cartridge
    12/29 at 2a-2h and the transfer mat drum 6 there are respective plate cylinders 4a-4h. As mentioned above, on the plate cylinders 4a-4h there are respective printing plates that have the final gears in relief on their external surface that faces the transfer blanket drum 6.
    [0063] Furthermore, the printing plates 4a-4h are responsible for the communication between the ink cartridges 2a-2h and the transfer blankets 5a-5l, which are placed on the outer surface of the transfer blanket drum 6. Obviously, there must be a positioning / interaction between the printing plates 4a-4h and the transfer blankets 5a-5l, so that the transfer blankets 5a-5l can interact in a precise way with the cans 8 to be printed.
    [0064] With a view to exemplify how the interaction between the components responsible for printing happens, Figure 5 shows an internal portion of the printing device 1. For practical purposes, only a part of the ink transfer for printing will be demonstrated , as the process is analogous for each ink cartridge.
    [0065] In Figures 5 and 6, the process, also an object of the present application, can be better understood, in which ink cartridge 2a supplies the ink for the printing plate 3a present on the plate cylinder 4a, and the ink it is transferred mainly to the high reliefs that exist there, which have a final art or print layout.
    [0066] The plate cylinder 4a, when in contact synchronized by the printing plate 3a with the transfer blanket drum 6, supplies the ink of its high relief to the transfer blanket 5a, in which this happens by the rotation of the plate printing that transfers the ink present on the high relief to the transfer blanket 13/29 5a.
    [0067] Subsequently and by opposite directions of rotation of the transfer mat drum 6 and the can indexer 11, the transfer mat 5a having the ink of the printing plate 3a transfers the ink present on the transfer mat 5a to the can 8, which is rotated under some pressure against the transfer mat 5a.
    [0068] It is highlighted that, if it is necessary to print more than one final art or different colors on the can 8, the transfer mat 5a will also have passed through the other printing plates 3b-3h present on the respective plate cylinders 4b -4h. The same happens successively with the other transfer blankets 5b-5l that have the final art coming from any printing plates that are necessary to obtain all the final art of different colors on the cans 8 to be printed.
    [0069] Thus, the final arts present on the printing plates are transferred to the transfer blankets, which in turn transfer the ink to the cans 8.
    [0070] The transfer blankets of the present invention can be seen in Figure 7.
    [0071] Usually, that is, in the prior art, these transfer blankets are only smooth surfaces that are used as a means of transferring ink between the printing plates 3a-3h and the cans 8 to be printed. However, in the present invention the transfer blankets also have the function of being a graphic medium that has an influence on the final arts of the cans 8 to be printed.
    [0072] In the example in Figure 7, only three transfer blankets 5a-5c are shown, but there may be several low relief blankets according to the need for different final gears on the cans 8. In other words, the number of different fine arts
    14/29 plaques or graphics of the blankets on the cans is limited to the number of blankets present on the blanket drum 6.
    [0073] In the preferred embodiment of the present invention it was decided to use a transfer blanket drum with twelve blankets 5a-5l, but, as mentioned above, only three blankets are shown in Figure 7.
    [0074] It is of utmost importance to note that transfer blankets 5a-5c have respective low reliefs 13a-13c, in which the low reliefs of final arts are in reality the low reliefs 13a-13c in different forms. Therefore, there is a final relief art 13a present in the blanket 5a, a final relief art 13b present in the blanket 5b and another final art in low relief 13c present in the blanket 5c.
    [0075] Thus, when there are three types of blankets 5a-5c with different final arts in low relief, it is possible that all the final arts that come from the printing plates are transferred by ink to the transfer blankets 5a-5c, so that cans 6 will be printed in this way.
    [0076] However, as each of the final gears 13a-13c is now in low relief, there will be no ink in this low relief portion for each of the blankets. There will be no contact, in this low relief region, between the blanket and the cans 8 to be printed. Indeed, the original color of can 8 will remain in this region free of ink or free of contact between can 8 and the respective mat that is transferring the ink from the transfer blankets to can 8.
    [0077] Therefore, if there is a final art in low relief 13a on the blanket 5a which, in the present example, a circle, there will be no printing or transfer of ink from this region in low relief to the can 8. Therefore, a first art end is formed on can 8, as shown in Figure 8, which is in the shape of a circle, for
    15/29 purposes of explanation.
    [0078] Thus, the next can 8 to be printed will also receive ink from the printing plates, but from the next blanket. In this example, the transfer mat 5a has an embossed artwork 13b in the form of a rectangle. In this way, the can to be printed will have a second final art in the form of a rectangle in the original color of the can.
    [0079] Following the same logic, a third can to be printed will also receive ink from the printing plates, but from a subsequent blanket other than the first two. This third transfer mat 5c has a final relief art 13c in the form of a pentagon, so that the can to be printed will have a third final art in the form of a pentagon in the original color of the can.
    [0080] As already mentioned, the number of different final gears on the cans will only be limited by the number of blankets present on the blanket drum 6.
    [0081] It is also emphasized that the final arts present on the blankets - which are portions of material removed from the blankets - are arranged directly on the blankets without any other type of layer on the blanket, so that the latter can have the function of printing, that is, the function of having a final art that will be present on the printed can.
    [0082] It is reiterated that the low reliefs or portions of material removal will represent the absence of paint, which will make it possible to see the original color of the can, be it the color of aluminum or a coating of another color than the can a be printed already has.
    [0083] The final art produced by the low relief will be a final contour on the printed side, which can provide a clearer final art, and the low relief present on the blanket will have less problems with the usual printing aspects, such as, for example, ink smudges, smudges, or any other type of problem related to pressure or high precision detailing.
    [0084] In Figure 8, it is shown by reticence that there is the possibility of more than three types of final arts of the process and printing device of the present invention. This is verified through a subsequent can with another artwork in the form of three consecutive lines.
    [0085] Obviously, the final arts or graphic arrangements are not limited to geometric shapes, but they can be any type of graphic medium that you want to print on cans 8, for example, names of people, teams, figures, etc. In this respect, the limitation is no longer in the printing process, but rather in the creativity of those who develop the final arts to be applied to printed cans.
    [0086] In view of the above, it is possible to have, on the same uninterrupted production line, cans with different final gears, which was possible only with the interruption of the production line until the advent of the present invention.
    [0087] However, it was not feasible, in terms of logistics, to obtain cans from the same production sequence with different final gears on the same platform, or even supplied to beverage manufacturers, such as supermarkets. However, this has been made possible with the present invention.
    [0088] In accordance with another embodiment of the present invention, a work of art with improved resolution and / or increasing complexity can be generated using transfer blankets 5a-5l with improved, highly detailed, low relief characteristics. In the prior art, printing plates 3a-3h carry the detailed art in high relief as described above. The raised art is transferred to a transfer mat 5a-5l which then prints can 8. As described above, the transfer sheets 5a-5l
    17/29 can be supplied with the low relief art in which the can 8 will have an ink-free area that corresponds to the low relief art on the transfer blankets 5a-5l. As an example, under a prior art printing process, the printing plate 3a-3h will have a raised feature. To print, for example, BRAND X SODA on a can, a printing plate 3a-3h has BRAND X SODA embossed on a surface of the printing plate 3a3h. The ink is applied in high relief on the surface of the printing plate in the form of BRAND X SODA.
    [0089] In the present invention, it is contemplated that improved and improved high-resolution low-relief characteristics can be generated by treating the transfer blankets 5a-5l with a suitable laser beam. In this embodiment, portions of the blanket 5a-5l are removed by laser treatment. Through laser ablation, very different, highly complex and detailed relief patterns can be created on each of the transfer blankets 5a-5l, instead of simple and similar shapes as discussed above.
    [0090] For example, each blanket 5a-5l is typically produced from a non-metallic material such as a rectangle of rubber (or a polymer or compound) the size of legal paper. Each blanket is typically 3.2 mm to 6.4 mm (½ to% inch) thick. Shading can be generated by varying the depth and size of the features in low relief. In practice, the areas printed on a finished can can be made lighter or darker depending on how much of the surface of a specific 5a-5l transfer mat is removed during the laser treatment process.
    [0091] Basically, there are two different properties that are essential to the laser treatment discussed here: cut tolerance and surface finish. A tec laser cutting equipment
    18/29 standard technology that has been in use for more than 5 years uses a focused laser beam. The spot size of the laser beam determines the tolerance and surface finish. Older laser cutting machines that have been in service for more than 5 years have a spot diameter size of 0.2 mm to 0.3 mm (0.008 to 0.010 inches). Newer laser cutting machines focus within a spot diameter size of 0.03 mm to 0.05 mm (1 to 2 thousandths of an inch (0.001 to 0.002 inches)). Generally, using a laser as contemplated by the inventors, a low relief feature that has a surface finish or depth as little as 0.03 mm (0.001 inches) or less can be created.
    [0092] Creating a feature in low relief and high resolution on a transfer mat 5a-5l using a laser cutting device, the device must position and move the beam precisely. With the beam moving in two dimensions (for example, an X & Y coordinate system) the speed of the laser beam movement must be controlled. For example, if a straight cut is being generated, the speed of the laser beam across the surface of the transfer mat needs to be constant. Once a curved or low relief cut pattern is desired, the speed at which the laser beam travels should be varied so that the laser beam itself can make the cut. Software and algorithms calculate the appropriate speed of the laser beam across the surface as cuts are made. Suitable transfer blankets were manufactured using a 420W Stork® laser engraver set at a speed of approximately 12 m / s . The result is a smooth cut and a smooth surface finish.
    [0093] To avoid a resulting smudging effect on a finished can caused by the low relief characteristics I produced
    19/29 by laser ablation on the transfer blankets 5a-5l, the transfer mat surface 5a-5l should have a better surface finish especially, or primarily, an edge of the transfer mat surface between the ablated surface low-relief laser and an untreated surface. The better the edge surface the laser creates, the better the printed edge of the finished product. This better surface finish will result in a cleaner, sharper image.
    [0094] The final surface finish of a 5a-5l laser-treated transfer mat is dependent on the thickness of the 5a-5l transfer mat prior to laser treatment. A thicker transfer mat will have a rougher final surface finish. The laser does not cut so smoothly on thicker substrates.
    [0095] However, depending on the algorithm, the speed, and the arc, the smoothness of the laser cut can be improved. When a laser is cutting through an arc or intricate shapes, the algorithm will change the speed and how the laser beam is moving. This results in a cleaner form.
    [0096] In the generation of transfer blankets of the present invention the laser beam spot size was generally in the order of 0.08 mm (0.003 inches). However, such a spot size is unsuitable for producing cans with high-resolution ink-free graphics as contemplated herein. More specifically, the inventors have determined that the embossed pattern quality of the transfer mat suffers when a laser beam spot size greater than 0.05 mm (0.002 inches) is employed. This will result in a target surface finish of approximately (125 to 250 microinches) (approximately 0.002 inches or 0.05 mm).
    20/29 [0097] To illustrate this aspect of the invention, referring to Figures 17 to 23, a transfer mat 5 is treated with a laser to produce a low relief rectangle 50. An area A in Figure 17 represents a corner 54 of the rectangle on an upper surface of the mat 5 forming an edge between a laser treated portion of the mat 5 and an untreated portion of the mat 5; a zone B represents the inner corners 66, 68 of rectangle 50; and a zone C represents a laser-treated surface finish on the rectangle bottom.
    [0098] Referring to Figures 18 to 20, in zone A, the quality of the corner 54 is a function of the laser beam design, the accuracy of positioning the geometric axes of XY coordinates, and the mat material 5. As shown in Figure 18, a sharp 90 ° corner is difficult to achieve. Generally, the corner exhibits a certain radius of curvature as shown in Figure 19. Looking at the edge level quality in Figure 19, the edge quality of corner 54 is dependent on the material because the projection of the blanket material can happen during treatment of laser. Thus, the contour of the cut must be within 2 parallel lines as shown in Figure 20.
    [0099] Referring to Figure 21, in theory in B, sharp angles in the inner corners 66, 68 would result from laser ablation forming the rectangle 50. However, as shown in Figure 22, due to the laser machining process, there will be 2 separate curvatures at the corners 66, 68, a first radius of curvature over the edge of the corner 66 forming the outline of the rectangle and a second radius of curvature at the corner 68 forming a bottom of the ablated groove. These rays are specific to the laser process used (laser type, laser parameters, type of material). As shown in Figure 23 a wall 70 between corners 66, 68 is inclined between 75 ° and 10 ° typically slanted out more than 90 ° more specifically 105 ° ± 5 °. In pra
    21/29, substantially 90 ° angles are formed at the corners when forming a solid image, such as the rectangle 50 shown. When producing microportions or points as described below, the wall 70 will generally be inclined according to the parameters presented above.
    [00100] Still, the corner 66 that forms the contour of the rectangle is critical in establishing the high level of graphic quality discussed hereinafter. A surface finish of the transition between an upper surface of a mat 5 on which the ink is deposited by a printing plate 3 (embossed portion) and the lowered portion of the mat 5 (low embossed portion) is less than or equal to 3.5 R a , preferably less than 3.5 R a , and more preferably 3.0 R a ± 0.1 R a . In addition, the most preferable surface finish in this region is 3.33 R max . Suitable blankets were manufactured using a surface finish of approximately 3.03 R a .
    [00101] In zone C, the surface finish of the rectangle bottom is a function of laser technology and mat material. A 125 to 250 micro-inch target (approximately 0.002 inches or 0.05 mm) for the surface finish is preferred to achieve the desired results. Suitable blankets having a surface roughness of 3.03 R a (3.33 R max ) have been produced having a bottom depth of approximately 0.38 mm (0.015 inches). The bottom depth of approximately 0.38 mm (0.015 inches) has been found to work well in that ink is not transferred from the bottom in low relief to the beverage container 8 when the bottom is at least 0.38 mm (0.015 inches) ).
    [00102] Figure 24 shows an example of three sequentially produced beverage containers which can be produced having a highly detailed unique art, in relation to each other. These cans have a gray scale art produced with three 5a blankets
    22/29
    5c only according to the present invention. Note that much of the detail is achieved through the natural metallic color of the metal can produced by characteristics in low relief on the blankets 5a-
    ç. In this example, at least one of the printing plates has a relatively large portion of the raised top surface. If blankets 5a-c were typical blankets used in the art, the cans would not injure any other art in an area of the side sidewall of can corresponding to the raised portion of the printing plate other than the total black color. In other words, but for the relief art of the blankets 5a-5c, the cans hurt at least a very large black portion. However, when the blankets 5a-5c according to the present invention are employed having low relief characteristics, the cans exhibit the art in a color combination comprising the background color (black) and a highly detailed unique art formed by original color of the can. This is accomplished by the printing plate having substantially a large area of an upper embossed surface with ink deposited on it which supplies the ink to the embossed portions of the mat (black). The blanket has a unique highly detailed art engraved on this in low relief. The beverage container may otherwise have details of the art provided by the remaining printing plates. In other words, each beverage can produced in a sequence up to a finite number of beverage cans, typically less than fifteen, will have a first art identical to the other beverage cans in the sequence and a second unique art for the individual beverage can .
    [00103] Figures 25A to D are front views of the blanket 5a-5d of the present invention which illustrate how the low relief characteristics produced according to the methods described above can be used to generate highly detailed art when used in combination with printing plates as described above.
    23/29
    Here, the characteristics in low relief can be varied in size and location to produce shading and details which result in a very complex image. According to additional principles of the invention, a plurality of unique blankets can be introduced into a rotary painting apparatus as described above in which a corresponding plurality of different resulting cans can be produced continuously and sequentially. For example, in the illustrated blanket, a man's face is shown. In practice, the can printing apparatus may be equipped with a plurality of blankets 5a-5d, for example, four, each of which exhibits unique low relief characteristics, relative to each other, to produce 4 cans sequentially, in that each of the four cans has a different art on it, for example, as different faces of man in the illustrated example. It should be noted that the number of different cans produced sequentially is only limited by the number of blankets that a specific printing device is capable of using. In the previous example, as few as two and as many as twelve different sequentially produced cans can be produced continuously.
    [00104] More specifically to Figures 25A to -D, each blanket 5a5d was treated with a laser to remove portions of an upper surface 84 from each blanket 5a-5d. Using a laser that has a laser beam spot size less than 0.05 mm (0.002 inches) a very precise removal of the blanket material can produce portions of micro high relief and low relief 88, 92 of the upper surface 84 of the blankets 5a-5d. A black paint was applied to the upper surface 84 of the blankets 5a-5d. It follows that the raised features 88 are black in the figures, and the raised features 92 are lighter in color. The resulting sequentially and continuously printed cans have a unique art so far I haven't realized
    24/29 using the can manufacturing technique.
    [00105] According to the invention, final art can be provided for each container in a sequence of continuously decorated drink cans, individually decorated. The printing plates can be provided to indirectly provide (via transfer blankets) an identical artwork for each beverage can in a sequence. The individual transfer blankets can have high and low relief characteristics to provide unique art for each drink side in the sequence, so that two or more adjacent beverage cans in a sequence of decorated drink cans can display some decorations or art identical (originating from the printing plates) and some unique art (originating from the transfer blankets).
    [00106] According to an embodiment of the invention and also to the characteristics described above, a can printing apparatus 1 has a plurality of ink cartridges 2a-2h, preferably each of a different color. A plurality of printing plates 3a3h is rotatable mounted on the apparatus 1, preferably as described above. Each printing plate 3a-3h is in communication with a corresponding ink cartridge of the plurality of ink cartridges 2a-2h and has an embossed artwork. A first printing plate in the plurality of printing plates 3a-3h has a first artwork comprising a raised portion of the first printing plate. This raised portion comprises a portion of an upper surface of the first printing plate and is adapted to receive ink from one of the plurality of ink cartridges.
    [00107] The apparatus 1 still has a plurality of transfer blankets 5a-5l. The plurality of transfer blankets 5a-5l is rotatably mounted on the apparatus so that each transfer blanket
    25/29 rotate around a single hub or central axis. A first transfer mat has a plurality of features in low relief and a plurality of features in high relief on an upper surface. The plurality of features in low relief cooperate with the plurality of features in high relief to form a second final art comprising a first character. The first character includes a shading pattern to simulate depth and contour. A second transfer mat also has a plurality of features in low relief and a plurality of features in high relief on its upper surface. This plurality of features in low relief cooperates with the plurality of features in high relief to form a third final art comprising a second character. The second character includes a shading pattern to simulate depth and contour which is unique in relation to the first character on the first transfer mat. The raised features on the first and second transfer blankets are attachable to the first printing plate and receive an ink supply from it.
    [00108] The apparatus 1 also includes a can indexer 11.0 can indexer is rotatable mounted on the apparatus 1 and has a plurality of stations for receiving the cans 8 in these. The can indexer 11 rotationally supplies a plurality of cans 8 sequentially and continuously to a printing location 15 where a first can 8 couples the first mat and receives ink from it at the printing place 15. Can indexer 11 transfers the first can 8 from the print location 15 while simultaneously transferring a second can 8 to the print location 15 where the second can 8 engages the second mat and receives ink from it.
    [00109] According to another embodiment of the invention, a method
    26/29 sequentially and continuously transfers a detailed art to a plurality of beverage cans 8 on a dry rotary offset beverage can printing apparatus 1. A first beverage can 8 in the plurality of beverage cans 8 receives a first art and a second beverage can processed by the apparatus 1 immediately subsequent to the first beverage can 8 receives a second detailed art which is unique in relation to the first detailed art.
    [00110] Features in low relief are created on a first non-metallic transfer mat with a laser that has a laser beam point less than 0.05 mm (0.002 inches) in diameter to remove portions of an upper surface of the first non-metallic transfer blanket in a first pattern. The first transfer blanket also has raised features that comprise the portions not removed from the upper surface. Low relief features are also created on a second non-metallic transfer mat with the laser to remove portions of an upper surface of the second non-metallic transfer mat in a second pattern other than the first pattern. The first and second non-metallic transfer blankets are mounted rotary on a dry rotary offset printing apparatus.
    [00111] A plurality of printing plates 3a-3h are provided and rotationally mounted on the dry rotary offset printing apparatus 1. Each printing plate 3a-3h has an embossed artwork. A first printing plate in the plurality of printing plates 3a-3h has a first artwork comprising a raised portion of the first printing plate. A second printing plate in the plurality of printing plates has a second high relief artwork different from the first
    27/29 first printing plate.
    [00112] A first amount of ink is applied to the embossed portion of the first printing plate. The first printing plate is brought in coupling with the first non-metallic transfer mat. The first printing plate is rotated against the top surface of the first non-metallic transfer mat. The ink is transferred from the embossed portions of the first printing plate to the embossed characteristics of the first non-metallic transfer mat.
    [00113] A second amount of ink is applied to the embossed portion of the second printing plate. The second printing plate is brought in coupling with the first non-metallic transfer mat. The second printing plate is rotated against the top surface of the first non-metallic transfer mat. The ink is transferred from the embossed portions of the second printing plate to the embossed characteristics of the first non-metallic transfer mat.
    [00114] A first beverage can is brought in coupling with the first non-metallic transfer blanket. The ink is transferred from the embossed portions of the first non-metallic transfer mat to form a first art for the first beverage container.
    [00115] A third amount of ink is applied to the embossed portion of the first printing plate. The first printing plate is brought in coupling with the second non-metallic transfer mat. The first printing plate is rotated against the upper surface of the second non-metallic transfer mat. The ink is transferred from the raised portions of the first printing plate to the raised characteristics of the second non-metallic transfer mat.
    28/29 [00116] A fourth amount of ink is applied to the embossed portion of the second printing plate. The second printing plate is brought in coupling with the second non-metallic transfer mat. The second printing plate is rotated against the upper surface of the second non-metallic transfer mat. The ink is transferred from the embossed portions of the second printing plate to the embossed characteristics of the second non-metallic transfer mat.
    [00117] A second beverage can is brought in coupling with the second non-metallic transfer blanket. The ink is transferred from the embossed portions of the second non-metallic transfer mat to form a second art for the second beverage can. The second art is unique in relation to the first art.
    [00118] An example of a preferred modality has been described, it should be understood that the scope of the present invention covers other possible variations, being limited only by the content of the accompanying claims, which include the possible equivalents. REFERENCE NUMBERS: printing device
    2a-2h: ink containers
    3a-3h: printing plates
    4a-4h: plate cylinders
    5a-5l: transfer blankets
    6: transfer blanket drum
    7: chain of cans
    8: can
    9: first steering wheel
    10: second steering wheel
    11: can loading device or can indexer
    12: central axis
    29/29
    13a-13c: art work under relief
    66: an edge portion that forms a transition between each of the plurality of low relief features and each of the corresponding high relief features on a transfer mat
    68: a portion of the edge that forms a transition between opposite the edge 66
    70: a wall that separates the characteristics in low relief from the high relief characteristics on a transfer mat
    80: a complex image that exhibits shading
    84: an upper surface of a transfer mat
    88: raised features on a transfer mat
    92: characteristics in low relief on a transfer blanket [00119] Although the specific modalities have been illustrated and described, numerous modifications come to mind without significantly departing from the spirit of the invention, and the scope of protection is only limited by the scope of the accompanying Claims .
    权利要求:
    Claims (20)
    [1]
    1. Can printing device (1), which comprises: at least one ink cartridge (2a-2h) that supplies ink to at least one printing plate (3a-3h) that has a first final art, by means of that said impression plate (3a-3h) is retained on a plate cylinder (4a-4h);
    the printing plate (3a-3h) communicates with at least two transfer blankets (5a-5l) attached to the transfer mat drum (6) to supply ink from at least one ink cartridge (2a-2h) with the first final art;
    the at least two blankets (5a-5l) being moved to transfer the ink from said at least one ink cartridge (2a-2h) to the cans (8);
    characterized by the fact that each of said at least two transfer blankets (5a-5l) has, respectively, a second and a third low relief ink-free final gears of at least one ink cartridge (2a-2h).
    [2]
    2. Can printing device (1) according to claim 1, characterized by the fact that the first final art present on the printing plate (3a-3h) is in high relief.
    [3]
    Can printing device (1) according to claim 1 or 2, characterized in that the printing device (1) is a rotary dry offset printer.
    [4]
    Can printing device (1) according to any one of the preceding claims, characterized in that it has eight ink containers (2a-2h) that interact with the transfer mat drum (6).
    [5]
    5. Can printing device (1) according to any of the preceding claims, characterized in that the blanket drum (6) has eleven transfer blankets (5a-5l)
    2/8 arranged symmetrically on the outer surface of the transfer blanket drum (6).
    [6]
    6. Process for producing cans (8) using a can printing device (1) as defined in any one of claims 1 to 5, characterized in that it comprises the following steps:
    the ink cartridge (2a-2h) supplies the ink to the printing plate (3a-3h) present on the plate cylinder (4a-4h);
    the printing plate (3a-3h) supplies the ink to the transfer mat (5a-5l) by rotating the printing plate (3a-3h);
    the transfer mat (5a-5l) transfers the ink present on it to the can (8);
    the transfer mat (5a-5l) forms, on the can, a final art of the low relief present on the transfer mat (5a5I).
    [7]
    7. Can (8) produced by the device (1) and by the process as defined in claim 1 or 6, characterized by having a low relief ink-free final artwork (13a-13c) present on the transfer mat (5a-5c ).
    [8]
    8. Transfer mat as defined in any one of claims 1, 6 or 7, characterized by having a final art in low relief.
    [9]
    9. Can printing device (1) characterized by comprising:
    a plurality of ink cartridges (2a-2h);
    a plurality of printing plates (3a-3h) rotationally mounted on the apparatus, each printing plate (3a3h) communicating with an ink cartridge corresponding to the plurality of ink cartridges (2a-2h) and having an art in high relief, a first printing plate in the plurality of printing plates
    3/8 pressure (3a-3h) having a first art comprising an embossed portion of the first printing plate comprising an upper surface portion of the first printing plate in which the embossed portion of the first printing plate receives ink from one of the plurality of ink cartridges;
    a plurality of transfer blankets (5a-5l) in which a first transfer blanket has a plurality of features in low relief and a plurality of features in high relief on an upper surface where the plurality of low reliefs cooperate with the plurality embossed features to form a second art comprising a first feature comprising a shading pattern to simulate depth and contour and a second transfer mat has a plurality of embossed features and a plurality of embossed features on its upper surface in which the plurality of features in low relief cooperate with the plurality of features in high relief to form a third art comprising a second character comprising a shading pattern to simulate depth and contour, which is unique in relation to the first character on the first transfer mat and in which the raised features on the first and second transfer mat are attachable with the first printing plate and receive an ink supply from it; and a can indexer (11) rotationally mounted on the apparatus having a plurality of stations for receiving the cans therein, the can indexer (11) rotationally providing a plurality of cans (8) sequentially and continuously to a printing location (15) where a first can (8) couples the first blanket and receives ink from it at the printing place (15) and where the can dexter (11) transfers the first can (8) from the printing place (15) while simultaneously transferring a second can (8) to the printing location (15) where the second can (8) couples the second mat and receives ink from it.
    [10]
    Can printing apparatus according to claim 9, characterized in that a portion of the edge that forms a transition between each of the plurality of low relief features and each of the corresponding high relief features has a radius of curvature.
    [11]
    Can printing apparatus according to claim 9, characterized in that the low relief characteristics of the first and second transfer blankets have a surface finish between 3.175 to 6.35 pm (125 to 250 microinches).
    [12]
    Can printing apparatus according to claim 9, characterized in that a wall separating the low relief characteristics from the high relief characteristics on each of the first and second transfer blankets tilts upwards from the characteristic in low relief for the feature in high relief at an angle greater than 90 °.
    [13]
    13. Can printing apparatus according to claim 9, characterized in that the low relief features on the first and second transfer blankets are formed by a laser having a beam point less than 0.05 mm (0.002 inches) in diameter.
    [14]
    Can printing apparatus according to claim 9, characterized in that a wall separating the low relief characteristics from the high relief characteristics on each of the first and second transfer blankets tilts upwards from the characteristic in low relief for the characteristic
    5/8 is in high relief at an angle greater than 90 ° and the edges of the first and second transfer blankets between the wall of the high and low relief features have a radius of curvature.
    [15]
    Can printing apparatus according to claim 9, characterized in that the plurality of printing plates comprises a second printing plate in the plurality of printing plates (3a-3h) having a fourth art comprising a raised portion of the second printing plate comprising a portion of an upper surface of the second printing plate in which the raised portion of the second printing plate receives ink from one of the plurality of ink cartridges and the first art is different from the fourth art.
    [16]
    A can printing apparatus according to claim 9, characterized in that a portion of the edge that forms a transition between each of the plurality of low relief features and each of the corresponding high relief features has a finish of surface less than or equal to
    3.5 R a .
    [17]
    17. Can printing apparatus according to claim 9, characterized in that a portion of the edge that forms a transition between each of the plurality of low relief features and each of the corresponding high relief features has a finish of surface that has 3.33 R max .
    [18]
    The can printing apparatus according to claim 9, characterized in that a portion of the edge that forms a transition between each of the plurality of low relief features and each of the corresponding high relief features has a finish of surface area from 3.0 R to ± 0.1 R a .
    [19]
    19. Can printing apparatus according to claim 9, characterized by the fact that the characteristics below
    6/8 relief have a depth of at least 0.38 mm (0.015 inches).
    [20]
    20. Method of sequentially and continuously transferring detailed art to a plurality of beverage cans (8) on a dry rotary offset beverage can printing apparatus (1) characterized by the fact that a first beverage can (8) in the plurality of beverage cans (8) receives a first detailed art and a second beverage can processed by the apparatus (1) immediately subsequent to the first beverage can (8) receives a second detailed art which is unique in relation to the first detailed art , the method comprising the steps of:
    create features in low relief on a first non-metallic transfer mat with a laser that has a laser beam point less than 0.05 mm (0.002 inches) in diameter to remove portions of an upper surface of the first non-transfer mat metallic in a first pattern in which the first transfer blanket comprises features in high relief that comprise the portions not removed from the upper surface;
    create features in low relief on a second non-metallic transfer mat with the laser to remove portions of an upper surface of the second non-metallic transfer mat in a second pattern different from the first pattern;
    rotationally mount the first and second non-metallic transfer sheets on a dry rotary offset printing apparatus;
    provide a plurality of printing plates (3a-3h) rotationally mounted on the dry rotary offset printing apparatus, each printing plate (3a-3h) having an embossed artwork, a first printing plate in the plurality of plates of
    7/8 printing (3a-3h) having a first final artwork comprising an embossed portion of the first printing plate comprising a portion of the upper surface of the first printing plate and a second printing plate in the plurality of printing plates having a second artwork in high relief different from the first artwork of the first printing plate;
    applying a first amount of ink to the raised portion of the first printing plate;
    applying a second amount of ink to the raised portion of the second printing plate;
    couple the first printing plate with the first non-metallic transfer mat;
    rotating the first printing plate against the top surface of the first non-metallic transfer mat;
    transfer the ink from the embossed portions of the first printing plate to the embossed characteristics of the first non-metallic transfer mat;
    couple the second printing plate with the first non-metallic transfer mat;
    rotating the second printing plate against the upper surface of the first non-metallic transfer mat;
    transfer the ink from the embossed portions of the second printing plate to the embossed characteristics of the first non-metallic transfer mat;
    coupling a first beverage can with the first non-metallic transfer blanket;
    transferring the ink from the embossed portions of the first non-metallic transfer mat to form a first art for the first beverage container;
    apply a third amount of paint to the top portion
    8/8 relief of the first printing plate;
    apply a fourth amount of ink to the raised portion of the second printing plate;
    couple the first printing plate with the second non-metallic transfer mat;
    rotating the first printing plate against the upper surface of the second non-metallic transfer mat;
    transferring the ink from the embossed portions of the first printing plate to the embossed characteristics of the second non-metallic transfer mat;
    couple the second printing plate with the second non-metallic transfer mat;
    rotating the second printing plate against the upper surface of the second non-metallic transfer mat;
    transfer the ink from the embossed portions of the second printing plate to the embossed characteristics of the second non-metallic transfer mat; and coupling a second beverage can with the second non-metallic transfer blanket; and transferring the ink from the embossed portions of the second non-metallic transfer mat to form a second art for the second beverage can, wherein the second art is unique in relation to the first art.
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-08-04| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-01| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|
    2021-08-17| B25G| Requested change of headquarter approved|Owner name: REXAM BEVERAGE CAN SOUTH AMERICA S.A. (BR/RJ) |
    2021-09-08| B25D| Requested change of name of applicant approved|Owner name: BALL BEVERAGE CAN SOUTH AMERICA S/A (BR/RS) |
    2021-09-28| B25G| Requested change of headquarter approved|Owner name: BALL BEVERAGE CAN SOUTH AMERICA S/A (BR/RS) |
    2021-10-05| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    BRBR102012016393-4A|BR102012016393A2|2012-07-02|2012-07-02|Can printing device, can printing process, printed can and blanket|
    PCT/IB2013/051746|WO2014006517A1|2012-07-02|2013-03-05|A device for printing cans, a process for printing cans, a printed can and a transfer blanket|
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