Laminate and packaging bag comprising same

一种层叠体、包装袋的技术，应用在运输和包装、包装、家用包装等方向，能够解决耐破袋性不足、易发生开裂等问题，达到不易破袋、耐热性优异、开封性优异的效果

Active Publication Date: 2021-03-16
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it is described that straight-line tearability is obtained by laminating the film and the base film, there is a problem that there is room for improvement in the tear strength, and cracks are prone to occur
However, there is a problem that there is still room for improvement in bag breakage when dropped, and bag breakage resistance is insufficient at temperatures lower than the operating temperature assumed in Patent Document 4.

Method used

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  • Laminate and packaging bag comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0256] (Preparation of Biaxially Stretched PBT Film)

[0257] As PBT resin 1, 1100-211XG (CHANG CHUN PLASTICS CO., L width, intrinsic viscosity 1.28 dl / g) was used.

[0258] Using a single-screw extruder, mix 80 parts by mass of PBT resin and 20 parts by mass of PET with an intrinsic viscosity of 0.62 dl / g formed by terephthalic acid / / ethylene glycol=100 / / 100 (mol%) Resin, and porous silica particles having an average particle diameter of 2.4 μm as inactive particles so that the silica concentration was 1600 ppm, and after melting the obtained complex, the molten line was introduced into a 12-element static mixer. In this way, the melt of the PBT resin is divided and laminated, and a multilayer melt composed of the same raw material is obtained. The melt was cast from a T-die at 265° C., and the melt was bonded to a cooling roll at 15° C. by an electrostatic bonding method to obtain an unstretched sheet.

[0259] Then, 3.0-fold roll stretching was performed in the longitudin...

Embodiment 2

[0279] A laminate was obtained in the same manner as in Example 1, except that a propylene-ethylene block copolymer (manufactured by Sumitomo Chemical, WFS5293-22) and an ethylene-propylene copolymer elastomer (manufactured by Mitsui Chemicals, Tafmer P0480) were mixed The mixing ratio was set to 96% by weight of the propylene-ethylene block copolymer and 4% by weight of the ethylene-propylene copolymer elastomer (manufactured by Mitsui Chemicals, Tafmer P0480).

Embodiment 3

[0281] A laminate was obtained in the same manner as in Example 1, except that the mixing ratio of the propylene-ethylene block copolymer (manufactured by Sumitomo Chemical, WFS5293-22) and the ethylene-propylene copolymer elastomer was set to propylene- 90% by weight of an ethylene block copolymer, and 10% by weight of an ethylene-propylene copolymer elastomer (manufactured by Mitsui Chemicals, Tafmer P0480).

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Abstract

The present invention provides a packaging bag which even when formed from a laminate comprising a biaxially stretched PBT film having large distortion of the molecular orientation axis demonstrates excellent straight-line cuttability and does not tend to delaminate when torn. The invention provides a laminate having a straight-line cuttability in the longitudinal direction of 5 mm or less. This laminate comprises: a biaxially stretched film substrate comprising a polyester resin composition containing 60% by weight or more of a polybutylene terephthalate resin; and a sealant film comprising apolyolefin resin composition containing 40 to 97% by weight of a propylene-ethylene block copolymer, 3 to 10% by weight of an ethylene-propylene copolymer elastomer, and 0 to 50% by weight of an ethylene-alpha-olefin random copolymer.

Description

technical field [0001] The present invention relates to a laminate comprising a biaxially stretched film substrate and a sealing film, the biaxially stretched film substrate comprising a polyester resin composition containing 60% by weight or more of A polybutylene terephthalate resin, wherein the sealing film comprises a polyolefin-based resin composition. Background technique [0002] The packaging bag is mainly manufactured by using a biaxially stretched film or the like made of polyamide resin, polyester resin, polypropylene resin, etc. The peripheral portion of the laminate of the sealing film based on the resin composition is heat-pressed at a temperature close to the melting point of the sealing film (hereinafter referred to as heat sealing). [0003] As for food packaging bags, so-called retort bags suitable for long-term storage of food by sterilizing the packaging bag filled with food by pressurized water vapor at about 130° C. are widely used. [0004] In recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/36B65D30/02
CPCB32B27/32B32B2255/10B32B7/12B32B27/16B32B2264/104B32B27/18B32B2307/54B32B2255/20B32B2307/732B32B2439/70B32B2264/025B32B2307/5825B32B27/36B32B2307/31B32B15/20B32B2307/736B32B2264/0235B32B2264/102B32B15/09B32B15/085B32B2307/306B32B27/08B32B2250/02B32B2250/03B65D75/00B32B2439/46B32B1/00B32B2250/24B32B2307/518C08L53/00C08L67/02
Inventor 户松稚登后藤考道西忠嗣
Owner TOYOBO CO LTD
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