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A kind of manufacture method of easy-tear polypropylene packaging film

A manufacturing method and technology of polypropylene film, which is applied in the field of plastic packaging, can solve the problems of poor tearing effect, high cost, and difficulty in tearing out cracks, and achieve the effect of easy tearing, reduced tear strength, and regular tearing

Active Publication Date: 2016-04-20
ZHEJIANG GOLDSTONE PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the packaging bag directly made of non-directional stretched polypropylene film as the heat-sealing layer is that the tearing effect is poor, and it is difficult to tear out the tear in a certain direction, let alone in a straight line.
[0004] The packaging bag made of biaxially stretched polypropylene film as the heat-sealing layer has the disadvantage of high cost, and the mechanical and physical properties of the film are reduced due to the biaxial stretching

Method used

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  • A kind of manufacture method of easy-tear polypropylene packaging film
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Examples

Experimental program
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Effect test

Embodiment 1

[0023] Present embodiment is a kind of manufacture method of easy-tear type polypropylene packaging film, has the following steps:

[0024] ①Primary stretching: take the polypropylene film that meets the hygienic requirements as the raw material, and perform unidirectional directional stretching on it, specifically, pass the polypropylene film through the surface of the heating roller with hot oil, and heat it to 130±3°C Stretching is carried out, and the stretching ratio is 3 to obtain a film material after directional stretching;

[0025] ②One-time cooling: cooling the directional stretched film material, specifically, making the directional stretched film material pass through the surface of the cooling roller with running water, so that its temperature is suddenly cooled to 25±3°C.

[0026] The film material obtained after a cooling treatment is detected, its thickness is 70 μm, the elongation at break in the stretching direction is 125%, the elongation at break in the uns...

Embodiment 2 to Embodiment 6

[0028] Embodiment 2 to embodiment 6 are basically the same as embodiment 1, and the difference is: each embodiment in embodiment 2 to embodiment 6 detects the easy-to-tear type polypropylene packaging film obtained at last, and its various properties The parameters are: the temperature at which the polypropylene film is heated is different, and the stretching ratio is also slightly different. In addition, the temperature at which it is quenched is also different. See Table 1 for specific parameters.

[0029] Table 1

[0030]

[0031] The tearing test was carried out on the polypropylene packaging film finally obtained in the above-mentioned Examples 1 to 6, and the tear was basically linear along the stretching direction, and it was an easy-to-tear polypropylene packaging film.

Embodiment 7

[0033] Present embodiment is a kind of manufacture method of easy-tear type polypropylene packaging film, has the following steps:

[0034] ①Primary stretching: take the polypropylene film that meets the hygienic requirements as the raw material, and perform unidirectional directional stretching on it, specifically, pass the polypropylene film through the surface of the heating roller with hot oil, and heat it to 130±3°C Stretching is carried out, and the stretching ratio is 3 to obtain a film material after directional stretching;

[0035] ②One-time cooling: cooling the directional stretched film material, specifically, making the directional stretched film material pass through the surface of the cooling roller with running water, so that its temperature is suddenly cooled to 25±3°C.

[0036] ③Secondary Stretching: Stretch it in one direction. Specifically, pass the polypropylene film through the surface of a heating roller with hot oil, heat it to 130±3°C and then stretch i...

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Abstract

The invention discloses a method for manufacturing an easy-to-tear type polypropylene packaging film. The method comprises the following steps: (1) taking a polypropylene thin film meeting the sanitary requirement as a raw material, stretching in a single direction, and specifically, heating the polypropylene thin film to 100DEG C to 160 DEG C, with the stretching ratio being 1.1 to 5, so as to obtain a film material after the positioning stretching; and (2) conducting the temperature reduction treatment for the film material after the positioning stretching, specifically reducing the temperature of the film material after the positioning stretching to the environmental temperature. A packaging bag manufactured through the invention has the advantages of easy tearing, and smooth tearing part, when the packaging bag is torn in the stretching direction.

Description

technical field [0001] The invention belongs to the technical field of plastic packaging, and in particular relates to a method for manufacturing an easy-to-tear polypropylene packaging film. Background technique [0002] Traditional polypropylene packaging bags are mostly made of non-directionally stretched polypropylene film as the heat-sealing layer, or biaxially stretched polypropylene film as the raw material. [0003] The disadvantage of the packaging bag directly made of non-directionally stretched polypropylene film as the heat-sealing layer is that the tearing effect is poor, and it is difficult to tear out the tear in a certain direction, let alone in a straight line. [0004] The disadvantage of the packaging bag made of biaxially stretched polypropylene film as the heat-sealing layer is that the cost is high, and the mechanical and physical properties of the film are reduced due to the biaxial stretching. Contents of the invention [0005] The purpose of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/04B29C35/02B29C35/16B29C71/00B29K23/00B29L7/00
Inventor 张文锋孙国锦
Owner ZHEJIANG GOLDSTONE PACKING
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