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  • 专利说明
  • 权利要求
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    • 专利摘要:
    538 183 by lamination or the like. In addition, in order to laminate the coated film of polyethylene terephthalate, it is necessary to apply an adhesive layer. However, since an adhesive is used, this lamination process has involved the negative aspect of cost increase. Furthermore, the problem has been noted that an organic solvent or the like used in the adhesive remains. Patent document 1 presents a processing process which comprises attaching a layer of polyethylene terephthalate and a polyethylene layer to a paper substrate without the use of the adhesive. Prior Art Document: Patent Document: [0004] Patent Document 1: JP-A-2011-1087 [0005] When the laminate described in the above-mentioned document is used as a packaging container for food, however, the food comes into contact with the polyethylene layer, which poses a problem in in the form of adsorption avolefin odor and fragrance components from the polyethylene layer. According to the above documents, the coated film of polyethylene terephthalate is used to improve the gas barrier properties of the container itself. For this purpose, the step of adhering to the paper substrate is necessary. Furthermore, the step must be added to the extruder polyethylene intended for heat sealing, so that two additional steps are required, which ultimately give a four-layer laminate. Therefore, the procedure in the document is unfavorable, as the manufacturing cost is difficult to reduce. Summary of the invention: Problems solved by the invention:
    公开号:SE538183C2
    申请号:SE1351045
    申请日:2012-02-10
    公开日:2016-03-29
    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 sealable laminate and a process for its manufacture. More specifically, the present invention relates to a laminate comprising at least three layers, namely paper substrate / polyethylene / polyethylene terephthalate, used in the layer of polyethylene / polyethylene terephthalate being heat sealable, and a process for producing the laminate.
    [2] Laminates with a coating of polyethylene on a paper substrate are used, for example, for packaging containers in different areas, as food.
    [3] In addition, in order to laminate the coated film of polyethylene terephthalate, it is necessary to apply an adhesive layer. However, since an adhesive is used, this lamination process has involved the negative aspect of cost increase. Furthermore, the problem has been noted that an organic solvent or the like used in the adhesive remains.
    [4] Patent document 1: JP-A-2011-1087
    [5] However, when the laminate described in the above-mentioned document is used as a packaging container for food, the food comes into contact with the polyethylene layer, which poses a problem in the form of adsorption avolefin odor and fragrance components from the polyethylene layer.
    [6] Under these circumstances, the present invention proposes a laminate comprising at least three layers, which is prepared by performing, under specific conditions, narrow extrusion lamination of polyethylene terephthalate on a paper substrate coated with a polyethylene surface, without interposing any anchoring or adhesive coating. maintains the heat seal shape required for a packaging material, and has excellent properties for long-term storage stability and for aroma preservation and whereby, since no adhesive layer is required, an odor problem due to residual solvents or the like is avoided.
    [7] It has been generally noted that a polyolefin resin such as polyethylene and an ester resin such as polyethylene terephthalate have been difficult to adhere to each other due to differences in functional molecular groups, etc. which comprises applying in the production line as a pre-treatment an anchoring layer modified with an adhesive and then narrowly extruding laminating polyethylene thereon, at the same time as a combination of high ozonation and corona discharge treatment.
    [8] The present invention involves extrusion lamination of polyethylene terephthalate under specific conditions on a two-layer laminate, which comprises polyethylene which is narrowly extruded laminated onto a paper substrate, without the step of applying a glue blank and a pre-treated polyethylene pre-treated anchorage. Through this, the invention has made it possible for adhesion between polyethylene and polyethylene terephthalate.
    [9] Furthermore, according to the first aspect of the present invention, the polyethylene terephthalate is homopolyethylene terephthalate, a film of polyethylene terephthalate is applied by an extrusion lamination process, the intrinsic viscosity of the polyethylene terephthalate is in the range from 0.72 to 0.88 dl / g. to prefer that the film consisting of the polyethylene terephthalate has a thickness of between 10 and 60 gm. A second aspect of the present invention is a container created by applying polyethylene terephthalate films in the heat sealable laminate on top of each other and heat sealing them together.
    [12] [FIG. 1] is a schematic production guide design of an example of an apparatus used in the process of producing the laminate of the present invention.
    [13] In the laminate of the present invention, it is a prominent property that polyethylene is applied to at least one surface of a paper substrate and that polyethylene terephthalate is laid on the polyethylene surface by narrow extrusion lamination, without any adhesive or the like being placed between them.
    [14] (Polyethylene terephthalate) Polyethylene terephthalate (hereinafter referred to as "PET") consists essentially of a polyester formed by dehydration condensation of ethylene glycol as the diol component and terephthalic acid as the dicarboxylic acid component, and which has interconnecting ester.
    [16] Furthermore, the homopolyethylene terephthalate used in the laminate of the present invention may comprise blending agents for films which are generally known per se, for example antiblocking agents, antistatic agents, lubricants, antioxidants and ultraviolet absorbers, in accordance with generally known formulations. 7 538 183
    [17] (Paper substrate) As the paper substrate in the laminate, all the paper sheets commonly used in paper containers can be used and different forms of them can be adapted to different areas of use.
    [18] If the substance weight is below this range, the mechanical half-strength of the resulting container may be the same as that obtained using the above-mentioned range. If the substance weight is above this range, on the other hand, the resulting container may become so heavy that its handling and economy become poor, and its formability may be poorer.
    [19] (Application of polyethylene to paper substrates) In the present invention, the laminate is produced by die extrusion lamination of polyethylene (hereinafter referred to as "PE") on the paper substrate, followed by die extrusion lamination of the polyethylene terephthalate on a surface.
    [20] On the surface coated with some such polyethylene, extrusion lamination of polyethylene terephthalate, as described later, can be performed.
    [21] (Surface treatment of the polyethylene layer) As for the polyethylene surface having the laminate of paper substrates and polyethylene, it is preferable that a surface treatment be performed to improve the adhesion of the polyethylene terephthalate during the extrusion lamination described later. Concrete examples of surface treatment Or corona discharge treatment, ozonation, flame treatment and plasma processing.
    [22] (Laminate) According to the present invention, the above-mentioned polyethylene terephthalate is extrusion laminated on the polyethylene layer extruded laminated on the paper substrate, to complete the laminate.
    [25] (Process for producing laminate) In the process for producing laminate according to the present invention, it is necessary to directly apply the above-mentioned polyethylene terephthalate stably to the polyethylene surface of the paper / polyethylene laminate, without the use of any adhesive or the like.
    [26] During the extrusion of the molten resin from the extruder, it is further preferred that the extrusion temperature of the molten resin is generally set to. a value range Tm + ° C or higher, but lower than Tm +70 ° C, based on the melting point (Tm) has the polyethylene terephthalate used.
    [27] Consequently - as is clear from the results of the examples which will be described later - the recirculation gap is larger than 25 cm, edge discharge, namely bilateral discharge of both edges of the film, will take place with a width of 4 mm or more, and the area for fluctuations in the film. thickness is ± 20% or more of the desired thickness, so that a film (PET layer) of uniform thickness cannot be formed (Comparative Example 1, Table 1). In addition, heat seal molds are also insufficient (Comparative Example 1, Table 5).
    [28] If the extrusion temperature has the polyethylene terephthalate during the narrow extrusion deviates from the range of Tm + ° C or higher, but lower than Tm + 70 ° C, it is black to create a uniform film thickness and the resulting film is clearly narrower in terms of edge release than that film. which meet the conditions above (Comparative Examples 2 and 3, Table 2). If the extrusion pressure further exceeds 6.5 MPa, the resulting film becomes clearly unsatisfactory in terms of edge depletion and uniform film thickness compared to the film recovering in the above range (Comparative Example 4, Table 3).
    [29] In the process for producing the laminate according to the present invention, which satisfies all the above-mentioned conditions, on the other hand, the width of the edge release is limited to less than 4 mm, the range for fluctuations in film thickness is as narrow as less than ± 20% of the desired the film thickness and adhesion are clearly marked (Examples 1 to 12,538,183 19).
    [29] According to the present invention, after the narrow resin film P of polyethylene terephthalate has been extruded into the polyethylene surface of the paper / polyethylene laminate B, the composite material is pinched between the cooling roll 3 and the pressure roll 4, as described above. In this case, it is undesirable for the PET layer to be cooled by the chill roll to suppress crystallization of the polyethylene terephthalate. This makes it possible to secure the heat sealing mold having the layer of polyethylene terephthalate. The surface temperature of the cooling roller is preferably in the range from about 10 to ° C.
    [31] It is important to maintain the extrusion pressure of the narrow resin film at a constant value, and it is also advisable to provide a gear pump between the extruder and the die, although this is not shown.
    [32] (Heat Sealant Shape) In the paper / polyethylene / polyethylene terephthalate laminate obtained according to the present invention, the layer of polyethylene terephthalate has heat seal shape. Corresponding parts of the laminate, or laminates, can thus be joined together by heat-sealing surfaces of polyethylene terephthalate to each other.
    [33] (Container) The laminate of the present invention can be formed into a container of a generally known type, such as a shell-shaped, tray-shaped or pad-shaped container, by superimposing the layers of polyethylene terephthalate and heat-sealing the overlapping areas.
    [34] The present invention will be described by way of example. However, the present invention is in no way limited to the scope of these examples.
    [35] (2) Lamination of polyethylene terephthalate to paper / PE The polyethylene surface having a coating thickness of 40 .mu.m in the laminate of paper and polyethylene was subjected to a corona discharge treatment and polyethylene terephthalate was extrusion laminated to the treated polyethylene surface under the following conditions. (width: about 110 cm) with a width between the opening flaps set to 0.8 mm (the air gap = the distance from the opening flaps of the T-nozzle to the polyethylene laminated paper laminate) was set to 10 cm, and an extrusion pressure was set to 4.0 MPa . Under these conditions, extrusion laminated homopolyethylene terephthalate at an extrusion temperature of 315 ° C from the die to the surface of the polyethylene layer (40 μm) of the paper / polyethylene laminate, which underwent corona discharge treatment. The polyethylene terephthalate used in Examples 1 to 14 and in Comparative Examples 1 to 5 was homopolyethylene terephthalate, which was a resin having an intrinsic viscosity of 0.83 dl / g and a melting point of 2 ° C (NOVAPEX BK6180, manufactured by Mitsubishi Chemical Corp.).
    [37] (Examples 2 to 5, Comparative Example 1) The same procedure as in Example 1 was performed, except that the air gap was set at the distances shown in Table 1. The status of the extruded laminate was evaluated. The results are shown in Table 1.
    [38] (Example 6) The same procedure as Example 1 was carried out, except that the air gap was set at 15 cm and the extrusion temperature of homopolyethylene terephthalate was set at 280 ° C. The status of the extruded laminate was evaluated. The results are shown in Table 2.
    [39] (Examples 7 to 9, Comparative Examples 2 to 3) The same procedure as in Example 6 was performed, except that the extrusion temperature of the polyethylene terephthalate was set at the temperatures shown in Table 2. The status of the extruded laminate was evaluated. The results are shown in Table 2.
    [40] (Example 10) The same procedure as Example 1 was performed, the feed air gap was set to cm and the extrusion pressure was set to 3.5 MPa. The status of the extruded laminate was evaluated. The results are shown in Table 3.
    [41] (Examples 11 to 15, Comparative Example 4) The same procedure as in Example 10 was performed, except that the extrusion pressure was set to the pressures shown in Table 3. The status of the extruded laminate was evaluated. The results are shown in Table 3.
    [42] (Evaluation procedures) 1. Edge removal width has the laminated film 0 Edge removal width within 2 mm A ... Edge removal width less than 4 mm 16 538 183 x Edge removal width of 4 mm or more Laminate with an edge removal width of less than 4 mm can be used practically.
    [43] [0043] 2. Uniformity in film thickness The range for fluctuations in the film thickness has the PET layer about ± 15% of the desired film thickness. A ... The range for fluctuations in the film thickness has the PET layer was less than ± 20% of the desired film thickness. The range of fluctuations in the film thickness has the PET layer equal to or greater than ± 20% of the desired film thickness.
    [44] 3. Adhesion Adequate adhesion between the PET layer and the polyethylene layer.
    [45] 4. Heat Sealant In connection with each of the laminates obtained in Examples 1 to 15 and Comparative Examples 1 and 2, the polyethylene terephthalate laminated surfaces were placed on top of each other and a hot plate installed on each of the heat seal temperatures 160 ° C, 170 ° C. ° C, 190 ° C and 2 ° C are maintained at a pressure of 2 kg / cm2 for 2 seconds by an impulse sealer, to heat seal the laminate.
    [46] Table 1 Width edge-Unity Air gap drainage at film (cm) laminated film thicknessWith adhesion.
    [47] Table 2 Extrud. Width edge- Unity Temp. release of film (° C) laminated film thickness
    [48] Table 3 Width Edge-Unity Pressure release with film (MPa) laminated film thickness Adhesion.
    [49] Table 4 Print Width Edge-Uniformity of release at film-laminated film thicknessWide adhesion.
    [50] Table PET surface / PET surface 160 ° C170 ° C190 ° C220 ° C Ex.1 (C)) g 0 0 Ex.2 (C)) 0 0 0 Ex.3 (C)) g 0 0 Ex.4 (C)) 0 0 0 Ex.A ogg Ex.6 oo 0 0 Ex.7 © 0 g 0 Ex.8 (C)) g 0 0 Ex.9 (C)) 0 0 0 Ex. ( C)) g 0 0 Ex.11 (C)) 0 0 0 Ex.12 (C)) g 0 0 Ex.13 (C)) 0 0 0 Ex.14 (g) gg 0 Ja.ex.1 A o Ja.ex.2 AA and 538 183
    [51] As shown in Table 5, customer satisfaction adhesion is observed in all examples when the polyethylene terephthalate surfaces are heat sealed.
    [52] (Examples 16 to 19) The polyethylene terephthalate resins used were homopolyethylene terephthalate having an intrinsic viscosity of 0.88 dl / g and a melting point of 2 ° C (NEH-2070, manufactured by UNITIKA, LTD.) (Example 16) , homopolyethylene terephthalate with an intrinsic viscosity of 0.80 dl / g and a melting point of 236 ° C (BR8040, manufactured by SK Chemicals Co., Ltd.) (Example 17), homopolyethylene terephthalate with an intrinsic viscosity of 0.76 dl / g and a melting point of 252 ° C (TRN-8550FF, manufactured by Teijin Chemicals Ltd.) (Example 18) and homopolyethylene terephthalate having an intrinsic viscosity of 0.72 dl / g and a melting point of 251 ° C (NES-2040, manufactured by UNITIKA, LTD.) (Example 19).
    [53] Table 6 PET surface / PET surface 160 ° C 170 ° C 190 ° C 2 ° C Ex. 16 0 g (0 0 Ex. 17 g (- :) 'g (9) Ex. 18 © CO; CgD CgD Ex. 19 0 g © 0 21 538 183
    [54] In all Examples 16 to 19, satisfactory adhesion was shown when the surfaces of polyethylene terephthalate were heat sealed.
    Industrial Application: The heat sealable laminate of the present invention has excellent water vapor barrier properties and excellent gas barrier properties. Furthermore, the layer of polyethylene terephthalate can be heat-sealed. The laminate thus has excellent properties for long-term storage and excellent properties for maintaining aroma, and can advantageously be used as a packaging material for food.
    According to the process for producing the laminate of the present invention, the three-ply laminate having the composition paper / polyethylene / polyethylene terephthalate can be provided at a low cost, without the use of any anchoring coating agent or adhesive. The laminate can therefore be used for the production of packaging material for general purposes.
    Explanation of designations: 1 Nozzle, 2 Patch, 3 Cooling roller, 4 Pressure roller 22
    权利要求:
    Claims (1)
    [1]
    1. / 1
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    法律状态:
    优先权:
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