Formation method of junction structure having peeling property

A technology of peelability and structure, applied in the field of formation of joint structure, can solve the problems of change of peelability and poor peelability, and achieve the effect of high pressure resistance, stable heat sealing strength and excellent peelability

Inactive Publication Date: 2013-12-04
SUNTOX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the peelability of the stretched polypropylene-based resin film varies depending on the resin composition of the heat-sealing surface of the polypropylene co

Method used

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  • Formation method of junction structure having peeling property
  • Formation method of junction structure having peeling property
  • Formation method of junction structure having peeling property

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0129] Example 1

[0130]

[0131] 1) Resin for main layer (A1)

[0132] To propylene alone polymer (MFR=2.0g / 10 minutes, melting point=162°C) 100 parts by mass, mix 1.5 parts by mass of anti-fogging agent (0.5 parts by stearoyl monoglyceride and stearoyl diethanolamine monostearate) A mixture of ester and stearyl diethanolamine (1.0 parts by mass) was used as the resin for the main layer (A1).

[0133] 2) Resin for sealant layer (A2)

[0134] To the resin A shown in Table 1 (propylene·ethylene·butene random copolymer (ethylene content=2.7wt%, butene content=9.0wt%, propylene content=88.3wt%, MFR=5.0g / 10 minutes, melting point =134°C)) 100 parts by mass, 0.2 parts by mass of anti-blocking agent (amorphous silica, average particle size=2.0μm), 0.1 parts by mass of lubricant (erucamide), as a sealant layer (A2) Use resin.

[0135] 3) Film making

[0136] In a three-layer state of laminated sealant layer resin / main layer resin / sealant layer resin, it is co-extruded from a T die and cast w...

Example

[0145] Examples 2-7, Comparative Examples 1-9

[0146] Except for the raw material resin of the sealant layer (A2) of the biaxially stretched sheet (A) containing the sealant layer and the raw material resin of the sealant layer (B2) of the thermoplastic resin member (B), change to Table 2 or Table 3 Otherwise, the same steps as in Example 1 were used to form a joint structure. The evaluation results are shown in Table 4. In Example 2, as the sealant resin of the sealant layer (A2), a mixture of 100 parts by mass of the resin D and 18 parts by mass of the resin F was used, indicating the propylene content of the mixed resin. The same applies to other examples.

[0147] Table 2

[0148]

[0149] table 3

[0150]

[0151] Table 4

[0152]

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Abstract

The invention provides a junction structure having the characteristics of high content protection property, easy peeling during the removal of a content, easy peeling property control, high pressure resistance, and difficult tearing of a biaxial stretching polypropylene film during peeling. The formation method of the junction structure is characterized in that the thermal fusion of a biaxial stretching slice (A) containing a sealant layer (A2) and a thermoplastic resin member (2) containing a sealant layer (B2) is carried out to form the junction structure having a peeling property at the thermal fusion part. The sealant layer (A2) of the biaxial stretching slice (A) includes a polypropylene random copolymer (PPA), the sealant layer (B2) of the thermoplastic resin member (2) includes a low-melting-point polypropylene random copolymer (PPB), and a difference between the content of the propylene unit of the PPA and the content of the propylene unit of the PPB, (PPA-PPB)/PPB*100%, is in a range of -5%-5%.

Description

technical field [0001] The present invention relates to a method for forming a bonded structure having peelability. More specifically, it relates to a method of thermally fusing a biaxially stretched polypropylene film and a thermoplastic resin member to protect the contents. When the contents are taken out, the thermally bonded portion can be easily peeled off, and the thermally bonded portion has high pressure resistance. Furthermore, a method for forming a bonded structure in which a biaxially stretched polypropylene film is not easily torn when peeled off. Background technique [0002] Conventionally, side dishes, bento, etc. are packaged in the form of a molded container and a molded lid, or a molded lid fixed to the molded container with adhesive tape. When forming a molded container and a molded lid, it is easy to remove the lid, but it lacks protection for the contents. In order to improve the protection of the contents, there is also a method of covering the molde...

Claims

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Application Information

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IPC IPC(8): B32B27/32
Inventor 仓本直彦田岛知己高松翌树
Owner SUNTOX
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