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Polypropylene film

A polypropylene film and copolymerized polypropylene technology, applied in the field of polypropylene film, can solve the problems of poor temperature resistance and impact resistance, easy to break bags, leakage, etc., and achieve excellent impact resistance, good dimensional stability, thermal good sealing strength

Active Publication Date: 2012-07-11
安徽双津实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polypropylene film currently used for retort packaging has poor heat resistance and impact resistance, and is prone to bag breakage, discoloration, deformation, delamination, leakage, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Outer layer: 98% 1#+2% 6#, accounting for 20% of the layer thickness,

[0038] Middle layer: 80% 1#+20% 3#, accounting for 60% of the layer thickness

[0039] Heat seal layer: 98% 1#+2% 6#, accounting for 20% of the layer thickness.

[0040] The polypropylene film prepared according to this embodiment was boiled for 30 minutes at 121-135 degrees centigrade without stretching.

Embodiment 2

[0042] Outer layer: 100% 1#, accounting for 20% of the layer thickness,

[0043] Middle layer: 80% 2# or 4#+20% 5#, accounting for 60% of the layer thickness

[0044] Heat seal layer: 98% 1#+2% 7#, accounting for 20% of the layer thickness.

[0045] The polypropylene film prepared according to this embodiment was boiled for 30 minutes at 121-135 degrees centigrade without stretching.

Embodiment 3

[0047] Outer layer: 95% 1#+5% 6#, accounting for 10% of the layer thickness,

[0048] Middle layer: 65% 1#+35% 3#, accounting for 80% of the layer thickness

[0049] Heat seal layer: 95% 1#+5% 6#, accounting for 10% of the layer thickness.

[0050] The polypropylene film prepared according to this embodiment was boiled for 30 minutes at 121-135 degrees centigrade without stretching.

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Abstract

The invention discloses a polypropylene film which is not stretched after high temperature cooking. The polypropylene film has a three-layer structure, including an outer surface layer, a middle layer and a heat sealing layer. Main materials of the outer surface layer are graft copolymer polypropylene, polyolefin elastomer or metallocene polyethylene and bonding agent; main materials of the middle layer are graft copolymer polypropylene or random copolymer polypropylene or the mixture of the two, polyolefin elastomer or metallocene polyethylene; main materials of the heat sealing layer are graft copolymer polypropylene, polyolefin elastomer or metallocene polyethylene and bonding agent. The film can be cooked for 30 minutes at the temperature of 121-135 DEG C without stretching; the film has good tensile strength, excellent anti-impact performance and good heat sealing strength; and the heat resistance of the film is good, and the film cannot deform after cooking and is good in dimension stability.

Description

technical field [0001] The invention relates to a polypropylene film, in particular to a high-temperature cooking unstretched polypropylene film. Background technique [0002] High-temperature cooking sterilization is a very effective sterilization method, which refers to the sterilization treatment under high temperature and high pressure above 100 degrees Celsius. Compared with dry heat sterilization, moist heat sterilization is better. Heat sterilization in air at 160°C for 30 minutes has the same effect as sterilization with hot water or steam at 100°C for 30 minutes. If the heating time is prolonged, the food will become brittle, and some bacteria can survive at 100°C, so it is necessary to use a temperature above 100°C for sterilization. It takes 400 minutes to kill spores at 100°C, but it only takes 4 minutes to increase the temperature to 120°C. Therefore, the higher the sterilization temperature, the shorter the sterilization time can be, which can reduce the emb...

Claims

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Application Information

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IPC IPC(8): B32B27/32B32B27/18B32B27/16
Inventor 唐新国王帮新张治国耿伟唐健
Owner 安徽双津实业有限公司
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