• 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:
    537 428 Summary In order to coat homopolyethylene terephthalate, which is inexpensive and readily available, directly on a paper base material, not via an adhesive layer, by extrusion coating, it is possible to produce a paper blank with heat sealability and with a homopolyethylene terephthalate film. A process for producing paper lanninate with a coating comprising homopolyethylene terephthalate formed on at least one surface of a paper stock material by extrusion coating is characterized in that an air gap L, expressed as the distance than a patch opening of a T-base paper to less than 25 cm or less.
    公开号:SE537428C2
    申请号:SE1250108
    申请日:2010-08-11
    公开日:2015-04-28
    发明作者:Kunio Yamauchi；Isao Iwaya
    申请人:Nissin Foods Holdings Co Ltd；
    IPC主号:
    专利说明:

    [1] The present invention relates to a heat sealing laminate and a process for producing it. In particular, the present invention relates to a laminate excellent for heat resistance, odor retardant properties, heat sealing, and economy, which laminate is made by forming general homopolyethylene terephthalate directly on a paper base; and a process for manufacturing the laminate.
    [2] In order to transfer various properties, such as water resistance and heat sealing, to a paper container (paper tray), it has been common to apply a resin coating to a base material of paper.
    [55] The laminate of the present invention has a coating applied directly to a paper base material, without an adhesive layer applied therebetween, which coating comprises inexpensive and readily available homopolyethylene terephthalate and having a uniform film thickness. Thus, this lamb food is excellent gallant economy. In addition, the laminate also has excellent heat resistance, excellent odor barrier properties and heat sealability, and can thus be used in various containers. Furthermore, due to its excellent heat resistance, the laminate can be used in microwave cooking including fats and oils.
    In addition, when the container consisting of the laminate of the present invention is used as a container for alcohol, impurities coming from the laminated layer do not release into the alcohol containing, so that the natural taste of alcohol disappears. Since the container consisting of the laminate according to the present invention has the excellent effect of maintaining the taste of the contents, as noted above, it can be preferably used Mr alcoholic food and beverage as well as alcoholic beverages.
    It goes without saying that the container composed of the laminate according to the present invention can be used in a similar manner, preferably for all non-alcoholic foods.
    Description of the male reference numerals: 1. Nozzle, 2. Patch, 3. Cooling roller, 4. Pressure roller 24
    权利要求:
    Claims (4)
    [1]
    A coating consisting of the homopolyethylene terephthalate is applied by an extrusion coating process;
    [2]
    2. the intrinsic viscosity of the homopolyethylene terephthalate is in the range 0.72 to 0.84 dL / g;
    [3]
    The coating consisting of homopolyethylene terephthalate has a thickness of 10 to 60 μm; and
    [4]
    4. the thickness of the coating consisting of the homopolyethylene terephthalate varies in a range of less than ± 20%. 3 537 428 It is obvious that the base material of paper may have an aluminum foil laminated at its surface. The present invention further provides a container shaped by laying the homopolyethylene terephthalate coated surfaces of the laminate on top of each other, and heat sealing them. The present invention further provides a process for producing a paper heat sealed laminate having a coating consisting of homopolyethylene terephthalate formed on at least one surface of a paper base material by an extrusion coating process, characterized in that an air gap, expressed as a distance from a to the base material of paper, is 25 cm or less. In the process for producing the heat sealing laminate of the present invention, it is preferable that the extrusion temperature of the homopolyethylene terephthalate during the extrusion in the extrusion coating process is in the range Tm + 25 ° C to Tm + 60 ° C based on the melting point T to 6.5 MPa. An aluminum foil can be laminated to the surface of the base material of paper. Effects of the Invention: According to the heat sealing laminate of the present invention, the coating of a uniform film thickness comprising inexpensive and readily available homopolyethylene terephthalate is coated directly on the base material of paper, without an adhesive layer being inserted therebetween. This entails the advantage of a good economy. The heat sealing laminate of the present invention has a heat sealing homo-PET coating formed on the surface. Thus, the laminates are placed on top of each other, and heat-sealed, whereby a container can be easily formed. In particular, the heat seal of the homo-PET / homo-PET surfaces, whose heat seal has hitherto been black, can be performed at a relatively low temperature. These facts are also clear from the results of the examples which will be described later. That is, in the heat-sealing laminate of the present invention, the heat-sealing of the homo-PET / homo-PET surfaces 4,537,428 can be performed reliably at a heat-sealing temperature of 190 ° C or higher, and an excellent heat-sealing can be achieved even at a low temperature of 160 ° C (Examples 1 to 3, 7 to 1114). On the other hand, in a laminate made by a process in which the air gap is large and whose extrusion temperature does not meet the present invention, a reliable heat seal of the homo-PET / homoPET surfaces has not been achieved, not even at 190 ° C (Comparative Example 1 and Comparative Example 2) The homopolyethylene terephthalate used in the present invention is excellent in heat resistance compared to copolymer polyesters as well as polyolefins which have also been used so far in coating resins. Thus, a container composed of the heat-sealing laminate of the present invention can be used in the use of microwave heating cooking comprising fats and oils. In addition, homopolyethylene terephthalate is excellent for odor barrier properties and odor barrier properties. Thus, a container composed of the laminate of the present invention has excellent taste-retaining properties. These facts are also apparent from the results of Example 19 described later. That is to say, a container composed of a laminate with polyethylene (PE) laminated therewith, shown in Comparative Example 6, showed the migration of β-dichlorobenzene to the inside of the container. Containers composed of laminates made by the manufacturing method of the present invention in Examples 1 and 15 to 18, on the other hand, clearly have high barrier properties compared to a container (Comparative Example 7) composed of a laminate formed by stacking biaxially oriented homo-PET films. which have been known to show high barrier properties. Even when a container composed of the laminate of the present invention, which is excellent for resistance to solving out or eluting resistance, contains alcoholic contents, the container has no possibility of discharging contaminants which cause the homo-PET coating into the contents, and does not degrade the taste of the contents. These conditions are also apparent from the results of Example 20 described later. That is, ethanol was introduced into each of a container 537 428 composed of the heat-sealing laminate of the present invention, and a container composed of a laminate with polyethylene (PE) coated on a paper base material. In the heat sealing laminate of the present invention, almost no contaminant components attributed to the homo-PET coating were detected in the imported ethanol. On the other hand, various contaminant components attributed to PE were discovered in the ethanol introduced into the PE-coated container. These impurity components are likely to reduce the purity of ethanol. As can be seen from these discoveries, the nal laminate according to the present invention is used as a basic material for containers for food and drink, the laminate clearly stands out in its ability to maintain aroma and taste. In the process for producing the laminate according to the present invention, it is an important feature to set the air gap to 25 cm or less when extruding a narrow resin film of homopolyethylene terephthalate. In this case, it is especially preferable to adjust the value of the extrusion temperature or extrusion pressure of a narrow resin to that in a particular range. By saying Ora, it will be possible to secure the excellent heat seal of the homopolyethylene terephthalate to each other and, even when universal homopolyethylene terephthalate is used, the formation of city edges can be vaporized. Thus, the coating with excellent adhesion to the base material of paper can be formed directly on the surface of the base material of paper. This has made it possible to produce, with high productivity, a heat-sealing laminate in which a coating comprising homopolyethylene terephthalate is directly formed on a base material of paper, to which the commercialization of laminate has so far been the answer. The process for producing the laminate of the present invention provides excellent film-forming properties and is limiting in the appearance of city edges and flanging food. Thus, this process can perform lamination at a relatively high speed, and can produce the laminate of the present invention with good productivity. Brief description of the drawings: 6 537 428
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    同族专利:
    公开号 | 公开日
    US9789670B2|2017-10-17|
    JP4750909B2|2011-08-17|
    SE1250108A1|2012-03-01|
    US20120189790A1|2012-07-26|
    CN102481772A|2012-05-30|
    JPWO2011019056A1|2013-01-17|
    WO2011019056A1|2011-02-17|
    CN102481772B|2016-03-09|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009186758|2009-08-11|
    PCT/JP2010/063644|WO2011019056A1|2009-08-11|2010-08-11|Heat-sealing laminate and method for producing same|
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