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
3 Cites 0 Cited by

AI-Extracted 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...
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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%.

Application Domain

Synthetic resin layered products

Technology Topic

PolypropylenePolymer chemistry +6

Image

  • 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(2)

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 with a casting roller at a temperature of 25°C, and then stretched 5 times in the vertical direction and 10 in the horizontal direction. Fold to obtain a progressively biaxially stretched film. Next, corona discharge treatment was performed on the sealant layers on both sides of the resulting biaxially stretched film to obtain a total of 25μm with a wetting tension of 40mN/m, a main layer (A1) of 22μm, and a sealant layer (A2) of 1.5μm on one side. The biaxially stretched sheet containing the sealant layer.
[0137]
[0138] 1) Resin for sealant layer (B2)
[0139] Compared 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, and 55 parts by mass of low-density polyethylene (MFR=3.7g/10 minutes) were mixed as a resin for the sealant layer (B2).
[0140] 2) Manufacturing
[0141] The resin for the sealant layer (B2) was heated and melted at 250°C, co-extruded from a T die with a film lip of 1.2 mm, and cooled and solidified on a cooling roller at 30°C to obtain a film. Next, corona discharge treatment was performed on one side of the obtained film to obtain a non-stretched film having a wetting tension of 42 mN/m and a thickness of 30 μm.
[0142] On the surface of the non-stretched film subjected to corona discharge treatment, as a base layer (B1), a polypropylene sheet (transparent, thickness = 0.5 mm) was laminated with a hot roller maintained at 150°C to obtain a thermoplastic resin Component (B).
[0143]
[0144] The thermoplastic resin member (B) was molded into a container shape by the method described in the above-mentioned method for measuring compressive strength, and the sealant layer (A) of the biaxially stretched sheet (A) containing the sealant layer was heat-sealed at the flange portion. A2) to form a joint structure. The evaluation results are shown in Table 4.

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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PUM

PropertyMeasurementUnit
Thickness0.5mm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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