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Polyethylene film for plastic composite flexible packaging and blow molding method thereof

A polyethylene film and flexible packaging technology, which is applied in the field of polymer packaging materials, can solve the problems affecting the labor efficiency of downstream enterprises, poor opening, and affecting aesthetics, etc., achieve excellent heat sealing performance against inclusions, reduce energy consumption, and improve The effect of labor efficiency

Active Publication Date: 2016-02-10
CHENGDU XINGHENGTAI PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the plastic composite flexible packaging industry, the polyethylene film used as the base material of the composite film is often due to its single or unscientific formula. When dealing with the packaging of different products in the market, sometimes the high heat-sealing temperature causes unevenness of the bag surface or crystal points on the film surface. Or scorch particles affect the aesthetics, sometimes it is easy to break or puncture during transportation due to insufficient strength, sometimes it affects the labor efficiency of downstream enterprises due to poor opening, etc.

Method used

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  • Polyethylene film for plastic composite flexible packaging and blow molding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The raw materials and weight percentages of the inner film are: LDPE 59.48%, LLDPE 19.83%, mLLDPE 19.83%, smooth opening agent 4‰, and mold release agent 4.8‰;

[0045] The raw materials of the middle layer film and their weight percentages are: LDPE 59.71%, LLDPE 39.81%, and release agent 4.8‰;

[0046] The raw materials of the outer film and their weight percentages are: LDPE 59.71%, LLDPE 39.81%, and release agent 4.8‰;

[0047] Pour the ingredients of the inner, middle and outer layers into the mixer for each layer, stir for 5 minutes, mix the ingredients evenly, and send them to the hopper; add the evenly mixed raw materials to the temperature that has been heated to the set value and kept for 4 hours Inside the extruder; turn on the main fan, the upper traction roller, the lower traction roller, and the equipment for the film blowing process in turn; after the extruder and die are added, heated to the set value and kept for 4 hours, turn on in turn The main fan, upper t...

Embodiment 2

[0049] The raw materials of the inner layer and their weight percentages are: LDPE 39.65%, LLDPE 39.65%, mLLDPE 19.83%, smooth opening agent 4‰, and mold release agent 4.8‰;

[0050] The raw materials of the middle layer and their weight percentages are: LDPE 39.81%, LLDPE 59.71%, and release agent 4.8‰;

[0051] The raw materials of the outer layer and their weight percentages are: LDPE 29.86%, LLDPE 49.76%, mLLDPE 19.9%, and mold release agent 4.8‰;

[0052] The blow molding method of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0054] The raw materials of the inner layer and their weight percentages are: LDPE7.93%, LLDPE67.40%, mLLDPE23.79%, smooth opening agent 4‰, mold release agent 4.8‰;

[0055] The raw materials of the middle layer and their weight percentages are: LDPE7.96%, LLDPE67.68%, mLLDPE23.88%, release agent 4.8‰

[0056] The raw materials of the outer layer and their weight percentages are: LDPE7.96%, LLDPE67.68%, mLLDPE23.88%, and mold release agent 4.8‰;

[0057] The blow molding method of this embodiment is the same as that of Embodiment 1.

[0058] The polyethylene film for plastic composite flexible packaging prepared with the formulas of the above three embodiments was used for mechanical experiments. The relevant mechanical test data are shown in the following table:

[0059]

[0060] It can be seen from the above table that the tensile strength, nominal strain at break, right-angle tearing force, falling impact impact and other physical and mechanical properties and friction coefficient p...

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Abstract

The invention discloses a polyethylene film for a plastic compound flexible package and a process thereof. The formula of the polyethylene film is as follows: an inner layer of the polyethylene film comprises the following raw materials in percent by weight: 5-60 percent of LDPE (Low-Density Polyethylene), 15-70 percent of LLDPE (Linear Low Density Polyethylene), 10-30 percent of mLLDPE (metallocene Linear Low Density Polyethylene), 0.1-0.5 percent of smooth opening agent, and 0.3-0.5 percent of a demoulding agent; a middle layer of the polyethylene film comprises the following raw materials in percent by weight: 5-60 percent of LDPE, 15-70 percent of LLDPE, 0-30 percent of mLLDPE and 0.3-0.5 percent of demoulding agent; an outer layer of the polyethylene film comprises the following raw materials in percent by weight: 5-60 percent of LDPE, 15-70 percent of LLDPE, 0-30 percent of mLLDPE and 0.3-0.5 percent of demoulding agent. According to the polyethylene film prepared by adopting the formula and the process of the scheme, the flexibility, the tensile strength, the impact resistance and the puncture resistance are greatly improved.

Description

Technical field [0001] The invention relates to the technical field of polymer packaging materials, in particular to a polyethylene film for GB / T4456-2008 plastic composite flexible packaging and a blow molding method thereof. Background technique [0002] In the plastic composite flexible packaging industry, polyethylene film as a composite film substrate is often due to its single or unscientific formula. When responding to the packaging of different products in the market, sometimes the high heat sealing temperature causes the bag surface to be uneven or the film surface is crystalline. Or coke particles affect the aesthetics, sometimes due to insufficient strength, it is easy to break or puncture during transportation, and sometimes due to poor openings, which affect the labor efficiency of downstream enterprises. Summary of the invention [0003] In view of the above-mentioned shortcomings in the prior art, the present invention provides a polyethylene film and its blow moldi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B29D7/01B29C55/28
Inventor 蒋昌勇蒋芙蓉蒋小东
Owner CHENGDU XINGHENGTAI PRINTING
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