• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In the manufacture of non-returnable packages for milk and other beverages the laminated packing material is sealed to itself along linear sealing zones by causing outer thermoplastic layers of the packing material to fuse together. The strength of the seal obtained depends upon the thermoplastic surface being free of impurities, e.g. oxide coatings or residues of the contents of the package. In spite of the presence of impurities a strong seal can be obtained if the thermoplastic layers, within a limited region of the sealing zone, are pressed against each other with such a force that molten thermoplastic material is made to flow to adjoining regions (15), since in this case the thermoplastics are blended to such a degree that the seal-preventing layer of impurities is broken.
    公开号:SU1635897A3
    申请号:SU823505248
    申请日:1982-10-06
    公开日:1991-03-15
    发明作者:Четрелли Ренато；Селберг Ганс；Балла Гуила
    申请人:Аб Тетра Пак (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a method of heat sealing a packaging laminate containing an outer layer of thermoplastic material. The method consists in that the thermoplastic layers in the sealing zone are laid one on top of another and heated for some time to a temperature of sealing.
    Packaging containers for milk and fruit drinks are usually made from multilayer packaging materials (laminates). Such packaging material consists of a central relatively rigid carrier layer of paper, covered on both sides with thin layers of homogeneous plastic material. The packaging material may also include layers of aluminum foil or other material. Common
    A feature of all packaging laminates of this type is that, on the side that faces the contents being packaged, they contain a layer of thermoplastic material, usually polyethylene, which allows sealing when heat and pressure are applied.
    In order to achieve the required strength and impermeability during sealing, it is necessary that the two thermoplastic layers that are attached to one another are clean and free from impurities. But since the surface of thermoplastic layers is usually covered with a thin oxide film formed during the extrusion of thermoplastic layers onto a packaging laminate, the complete melting of CJ SP 00
    about
    Vj
     with
    The thermoplastic layer is often difficult to form, and therefore the strength and impermeability of the sealing joint frequencies do not reach the theoretically possible values. Other types of contaminants can often be found on the surface of thermoplastic layers, such as residual contents, which also impair the tightness. This is a particular problem in the production of packaged forms when the sealing of a multilayer material occurs in the presence of the contents, i.e., when it is first necessary to remove the contents from the space between the thermoplastic surfaces opposed to each other before. as will be the direct sealing. However, in practice, the contents can not be completely removed and small amounts of it remain in the sealing zone, which degrades the quality of the sealing seam. The purpose of the invention is to improve the quality of sealing.
    It is necessary to develop a method of heat sealing the packaging laminate, which would ensure optimal sealing in the presence of contaminants on the surface of the packaging laminate, for example, oxides, residual contents of the packaging and dirt.
    A method of heat sealing a packaging laminate containing layers of thermoplastic material and a layer of foil interposed between them is as follows.
    The laminate areas in the sealing zone are laid one on another and heated through a layer of foil by high-frequency current while applying pressure (press layers), the amount of which is set to ensure that the adjacent layers of thermoplastic material overlap one another layer of the laminate from the pressure zone. in adjacent areas. The heating of the laminated parts of the laminate is carried out by means of a clip having a protruding rectangular portion made of an electrically conductive material. The height of this area is 0.2-0.8 the thickness of the laminate. The width of the plot corresponds to the thickness of the laminate.
    With this method, the molten thermoplastic material transferred under pressure from the linear region to the adjacent parts of the sealing zone will capture possible impurities, and two thermoplastic layers of laminate. placed one on another, they are effectively mixed to such an extent that
    their complete fusion. In the linear region, only a very thin thermoplastic layer remains that does not contain impurities and is in close contact with the layer.
    the packaging laminate carrier, while in the adjacent areas of the containment zone, the accumulation of well-mixed thermoplastic materials of both layers ensures high strength and impermeability of the sealing joint.
    Figure 1 shows the packaging laminate, the cross section; figure 2 - sealing clip, cross section; FIG. 3 is a sectional view of two packaging lamies of nats that are sealed using the method according to the invention; figure 4 - sealing clip option. The packaging laminate (Figure 1) is of a type widely used for packaging.
    0 milk and other fruit drinks. The total thickness of the packaging laminate is 0.4-0.5 mm and it consists of a central carrier layer 1 of fibrous material. This layer 1 on both sides is covered with relatively thin homogeneous layers 2, 3 of thermoplastic material, in particular polyethylene .. Between one external plastic layer 3 and carrier layer 1 there is often another
    0 layer 4 of aluminum foil, this layer is connected to the carrier layer with the help of thermoplastics (not shown) and is completely covered with an outer, homogeneous layer 3. Thanks, two external thermoplastic
    5 layers of m 2 and 3 packaging laminate can be simply sealed by heat, pressing together the parts that need to be sealed, while heating the thermoplastics to
    0 their melting point (130 ° C). Other types of packaging laminates can also be sealed, but a thermoplastic material layer is required in the packaging laminate.
    The sealing clip 5 has a housing b, made of an electrically non-conductive material, having a groove in which the rod 7 is inserted from an electrically conductive material, preferably copper. The rod 7, which is located in the center of the housing 6., together with the surrounding areas of the housing b, forms a working surface 8. On the working surface 8 there is a protruding section 9. It has a rectangular cross section and a height (a). 0.2-0.8 times the thickness of the laminate. but preferably a thickness of 0.5 laminate and a width (b) which corresponds to the thickness of the packaging
    laminate flooring. Thus, the working surface 8 of the sealing clip 5 has in its central part a heating area of the laminate, which includes, on one side, a protruding section 9, and on the other side, one adjacent area on the side of this section. The heating zone of the laminate is connected through the material in the rod 7 with a high-frequency energy source, thus providing high-frequency welding of the laminate containing aluminum foil. The heating zone of the laminate or rod 7 can also be heated and consist, for example, of a material with high electrical resistance in the case when the packaging laminate is to be joined without aluminum foil or other electrically conductive layers.
    The sealing jaw 5 may be provided with one or more channels for a cooling medium, such as water, which prevents a dangerous temperature increase or undesirable distribution of heat to adjacent areas, which should remain unheated. It is also possible to design a sealing clip 5 from several mutually interchangeable parts. Portions of the sealing jaw 5 located on either side of the protruding portion 9 can be movable relative to the portion 9 and pressed with springs in the direction of the material, so that the corresponding contact pressure will be maintained automatically. The sealing clip 5 can also be doubled, i.e. it may consist of two bodies of the type described, located at some distance from each other. This design of the proposed device is especially recommended in cases where the tube of packaging material, i.e. when sealing takes place in two opposite zones and between them cutting is performed, since the knife or some other suitable cutting device can act in the gap between the two main bodies of the sealing clip.
    The method is carried out as follows.
    Two sections 10 and 11 of one folded packaging laminate (or two packaging laminates) are joined together to form a sealing seam, so that they are placed one on top of the other with their outer thermoplastic layers 3. Sections 10 and 11 are squeezed (pressed) with a sealing clip 5 and the anti-clamp 12, located with the opposite
    side of the packaging laminate (indicated by dotted lines). Counter fastener 12 is provided with a flat working surface located against laminate 11. Terminals 5, 12 are mounted on a frame (not shown) of the packaging machine in such a way that, using hydraulic or mechanical drive mechanisms, they can perform reciprocating 0 motion and in the process sealing, they can be pressed together with a certain, adjustable force. At the same time, when the clamps move towards each other and the pressing starts of the sections 10, 11 of the packaging laminate 5 located between them, the rod 7 of the sealing clamp 5 is connected to a high-frequency energy source. Thus, in the aluminum layer 4 of the packaging laminate is induced
    0 is a variable field and it is heated in the region corresponding to the surface of the rod 7 to a temperature that is much higher than the melting point of the adjacent thermoplastic layers. Generated by
    5, heat is transferred directly to the thermoplastic layer m 3 located between the layers of aluminum, with the result that the former melt and become fluid. Due to high load (approx.
    0 100 kg / cm2), which acts on the packaging laminate during pressing at the level of section 9 of clip 5, the molten thermoplastic will flow from the zone 13 of application of pressure to the adjacent zones 14
    5 common sealing area. Since the thermoplastic layers 3, which are located one against the other in an area not entering the sealing zone, continue to be in a solid state and one is pressed
    0 with another, the molten thermoplastic cannot penetrate further into the parts located outside the sealing zone, but remains in two zones 14, where it forms thickening 15 parallel to the elongated
    5, pressure zone 13, in which two layers are sealed to be sealed together. In zone 13, only a small amount of plastic material remains, which, due to surface irregularities and the like.
    0 cannot be squeezed out, whereas the thickenings 15, formed on both sides of this zone, contain an excess of well-mixed plastic, thus providing a very durable and in practice
    5 indestructible mount between these two layers. Since the process of flow from zone 13 to zone 14 occurs very quickly, when plastic material flows out, turbulence occurs, which ensures good mixing of plastic
    the material of two layers arranged one against the other, as a result of which any surface oxides or other impurities on the surface (e.g., the remnants of the contents of the package being sealed) are effectively mixed with the plastic and a continuous film of impurities is destroyed, deteriorating the strength of attachment.
    When packing some types of food products, it may be preferable to transfer the flow of molten thermoplastic material a greater distance from the Edge in order to have a wider and flatter thickening 15. This can achieve a smoother and more flexible sealing area, which gives a stronger grip, since roughness does not occur, which are the accumulation points of external loads.
    The above advantages are realized when using the second embodiment of the present invention, which consists in that one longitudinal side of the protruding portion 9 of the clamp 5 practically coincides with one side of the heated region of the working surface 8 (FIG. 4), with the result that the heated region adjacent to portion 9 is located at a higher level than the level of the working surface 8 on the outer side of the section 9. Moreover, it is desirable that the distance between the levels of the heated area and the level of the section 9 behind Press 5 was basically equal to the distance between the specified heated area and the level of the working surface on the other side of section 9, i.e. distance (a) is equal to distance (c) (figure 4).
    When using a clamp 5 of this design, the main part of the melted thermoplastic material is directed in the direction of the heated side of the protruding portion 9. A higher level of the heated region (compared to the first embodiment of the clamp) results in a smaller and more elongated space for the current thermoplastic material as it reaches the thermoplastic layers which are located outside the heating region and as a result are in a solid state. Accordingly, the elongated thickening 15 of the thermoplastic material, extruded from the high pressure zone 13 immediately before the protruding section 9, acquires a flatter and more oblong cross-sectional shape, which provides greater flexibility of thickening and greater fixing strength.
    权利要求:
    Claims (1)
    [1]
    In order to ensure greater linearity of the thickened 15 molten plastic, parts of two plastic laminates. located outside the sealing zone, can be cooled. This can be done either by using cooling channels in clips 5 and 12, located outside the sealing zone through which the fluid flows, or through this type of attachment, which flows with simultaneous extrusion of the contents, which cools the surrounding areas of the packaging laminate. Claims The method of heat sealing a packaging laminate containing layers of thermoplastic material and a foil layer interposed between them, imposing the laminate sections on top of one another and heating them while applying pressure by means of a clip, characterized in that, in order to improve the quality of the sealing, the laminate is heated through the foil layer by high frequency current, while heating is carried out by means of a clamp having a conductive material made of The protruding portion of the rectangular shape, the height of which is 0.2-0.8 thicknesses of the laminate, and the width corresponds to the thickness of the latter, while the pressure is set so as to ensure the flow of adjacent layers of thermoplastic material superimposed one on the other. pressure zones in adjacent zones.
    one
    eleven
    Fie1
    FIG. 2
    p g
    FIG L
    类似技术:
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    SU1635897A3|1991-03-15|Process for thermal sealing of packing laminate
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    同族专利:
    公开号 | 公开日
    JPS58134744A|1983-08-11|
    AU8921482A|1983-04-14|
    ZA827298B|1983-11-30|
    SE433322B|1984-05-21|
    UA5967A1|1994-12-29|
    JP3175118B2|2001-06-11|
    DK158502C|1990-10-29|
    CA1200749A|1986-02-18|
    NO823345L|1983-04-11|
    NO163178B|1990-01-08|
    DE3274819D1|1987-02-05|
    AU552656B2|1986-06-12|
    ES279693Y|1985-06-01|
    HK22188A|1988-03-31|
    JPH07164523A|1995-06-27|
    JPH0242055B2|1990-09-20|
    SE8105960L|1983-04-09|
    JP2501777B2|1996-05-29|
    MY100421A|1990-09-29|
    ES279693U|1984-11-16|
    JPH05269854A|1993-10-19|
    DK158502B|1990-05-28|
    JPH0729382B2|1995-04-05|
    DK441982A|1983-04-09|
    NO163178C|1990-04-18|
    BR8205892A|1983-09-06|
    EP0076966A1|1983-04-20|
    EP0076966B1|1986-12-30|
    JPH09240607A|1997-09-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3078201A|1960-03-21|1963-02-19|Midwest Research Inst|Seam structure for a flexible bag|
    NL291443A|1962-04-13|
    DE1221785B|1964-02-07|1966-07-28|Honsel Karl Heinz|Method and device for the production of weld seams on thermoplastic plastic films to be welded together|
    US3575769A|1968-03-27|1971-04-20|American Can Co|Tube side seaming method and apparatus|
    NL6918376A|1968-12-24|1970-06-26|
    US3673041A|1970-09-08|1972-06-27|Us Army|Heat sealer|
    FR2230484B3|1973-05-23|1976-05-21|Thimonnier & Cie|
    JPS5934501B2|1975-08-06|1984-08-23|Toyo Seikan Kaisha Ltd|
    JPS553215A|1978-06-23|1980-01-11|Hitachi Ltd|Semiconductor switch circuit|
    SE433322B|1981-10-08|1984-05-21|Tetra Pak Int|DEVICE FOR HEAL-SEALING PACKAGING LAMINATE - DESIGN OF THE SEAL BACK|SE433322B|1981-10-08|1984-05-21|Tetra Pak Int|DEVICE FOR HEAL-SEALING PACKAGING LAMINATE - DESIGN OF THE SEAL BACK|
    GB2151178B|1983-12-14|1986-10-29|Laser Engineering|Method for joining sheet materials|
    SE451974B|1985-08-22|1987-11-09|Tetra Pak Ab|SET AND DEVICE FOR INDUCTION SEALING THERMOPLAST COATED PACKAGING MATERIAL INCLUDING ATMINSTONE ONE LAYER OF METAL WRAP|
    JP2571977B2|1990-10-19|1997-01-16|四国化工機株式会社|Heat sealing device for tubular packaging materials|
    DE4205583A1|1992-02-24|1993-08-26|Windmoeller & Hoelscher|SWEATBAND|
    JP4326043B2|1998-08-10|2009-09-02|四国化工機株式会社|Heat sealing equipment|
    JP4127907B2|1998-09-28|2008-07-30|四国化工機株式会社|High frequency heat seal device|
    JP4232922B2|1998-10-30|2009-03-04|日本テトラパック株式会社|Heat sealing device and filling machine|
    JP4282179B2|1999-09-30|2009-06-17|四国化工機株式会社|Ultrasonic sealing device|
    JP3721309B2|2001-02-09|2005-11-30|四国化工機株式会社|High frequency heat seal device|
    JP4643841B2|2001-02-27|2011-03-02|四国化工機株式会社|High frequency heat seal device|
    AT258880T|2001-03-12|2004-02-15|Tetra Laval Holdings & Finance|METHOD AND DEVICE FOR ULTRASONICALLY SEALING THE WALLS OF A PACKAGING MATERIAL FILLED WITH A FLOWABLE FOODSTUFF|
    DE10147565A1|2001-09-26|2003-04-10|Varta Microbattery Gmbh|Device for gas and liquid-tight sealing of the housing of galvanic elements|
    KR100438019B1|2002-04-12|2004-06-30|김종기|Sealing apparatus for spout for pouch-type liquid storage container, sealing method and pouch-type liquid storage container of the same|
    US7484347B2|2003-10-14|2009-02-03|Tetra Laval Holdings & Finance S.A.|Packaging filling apparatus and transversal sealing apparatus|
    JP5333038B2|2008-09-10|2013-11-06|パナソニック株式会社|Vacuum insulation and manufacturing method thereof|
    JP5040881B2|2008-09-10|2012-10-03|パナソニック株式会社|Vacuum insulation|
    US8216529B2|2008-09-15|2012-07-10|Abbott Point Of Care Inc.|Fluid-containing pouches with reduced gas exchange and methods for making same|
    JP2010255805A|2009-04-28|2010-11-11|Panasonic Corp|Vacuum heat insulating material|
    JP5779291B1|2014-08-22|2015-09-16|一夫 菱沼|Composite heat seal structure adaptable to overlapping step|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE8105960A|SE433322B|1981-10-08|1981-10-08|DEVICE FOR HEAL-SEALING PACKAGING LAMINATE - DESIGN OF THE SEAL BACK|LV930960A| LV5434A3|1981-10-08|1993-06-30|Packaging laminate thermal sealing|
    LTRP999A| LT2511B|1981-10-08|1993-09-20|THE WAY OF PACKAGING LAMINATED HERMETIZATION|
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