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A low-temperature polyethylene shrink film and its blown film process

A low-temperature polyethylene and shrink film technology, applied in flexible coverings, packaging, layered products, etc., can solve the problems of high energy consumption, high shrinkage temperature, product performance, thickness, and strength are not stable enough to achieve temperature control. Accurate, high production efficiency and stable blown film process conditions

Active Publication Date: 2015-10-28
ZHENGXIN PACKAGING CO LTD DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The shrinkage temperature of the polyethylene shrink film produced by the existing technology is generally high, the energy consumption is large, and the performance, thickness and strength of the product are not stable enough. With the development of technology, various enterprises strive to meet the good physical, On the basis of mechanical properties, further reduce the production cost of polyethylene shrink film

Method used

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  • A low-temperature polyethylene shrink film and its blown film process

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Effect test

Embodiment 1

[0031] A low-temperature polyethylene shrink film, the low-temperature polyethylene shrink film is composed of three layers of co-extruded and bonded films, namely an outer layer, a middle layer and an inner layer;

[0032] The outer layer is composed of 50% high melting point blown film grade polyethylene, 25% coating grade polyethylene, and 25% metallocene polyethylene by weight percentage;

[0033] The middle layer is composed of 50% high-melt finger blown film grade polyethylene, 30% coating grade polyethylene, and 20% metallocene polyethylene by weight percentage;

[0034] The melt index of the high melting point blown film grade polyethylene ≥ 4g / 10min, density ≤ 0.925g / cm 3 , the present embodiment selects the high-melt index blown film grade polyethylene that the model is Yangzi BASF 2420K; The melting index of described coating grade polyethylene ≥ 7g / 10min, density are 0.910g / cm 3 ~0.930g / cm 3 , this embodiment selects the coating grade polyethylene whose model is ...

Embodiment 2

[0043] A low-temperature polyethylene shrink film, the low-temperature polyethylene shrink film is composed of three layers of co-extruded and bonded films, namely an outer layer, a middle layer and an inner layer;

[0044] The outer layer is composed of 70% high melting point blown film grade polyethylene, 5% coating grade polyethylene, and 25% metallocene polyethylene by weight percentage;

[0045] The middle layer is composed of 43% high-melt finger blown film grade polyethylene, 27% coating grade polyethylene, and 30% metallocene polyethylene by weight percentage;

[0046] The melt index of the high melting point blown film grade polyethylene ≥ 4g / 10min, density ≤ 0.925g / cm 3 , the present embodiment selects the 2426K high melting index blown film grade polyethylene that the model is China Sea Shell Petrochemical Co., Ltd; 3 ~0.930g / cm 3 , the present embodiment selects the coating grade polyethylene that model is Mitsui Chemicals 403; Said metallocene polyethylene refers ...

Embodiment 3

[0055] A low-temperature polyethylene shrink film, the low-temperature polyethylene shrink film is composed of three layers of co-extruded and bonded films, namely an outer layer, a middle layer and an inner layer;

[0056] The outer layer is composed of 60% high melting point blown film grade polyethylene, 10% coating grade polyethylene, and 30% metallocene polyethylene by weight percentage;

[0057] The middle layer is composed of 40% high-melt finger blown film grade polyethylene, 25% coating grade polyethylene, and 35% metallocene polyethylene by weight percentage;

[0058] The raw material composition of the inner layer is the same as that of the outer layer;

[0059] The melt index of the high melting point blown film grade polyethylene ≥ 4g / 10min, density ≤ 0.925g / cm 3 , the present embodiment selects the high-melt finger blown film grade polyethylene that model is Dow 5005 for use; The melting index of described coating grade polyethylene ≥ 7g / 10min, density are 0.910...

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Abstract

The invention relates to the technical field of shrink films, in particular to a low-temperature polyethylene shrink film and a blown-film process. , 5%~25% of coating grade polyethylene, 20%~30% of metallocene polyethylene; the middle layer is composed of 30%~50% by weight of high melting finger blown film grade polyethylene, 20% ~30% coating grade polyethylene, 20%~50% metallocene polyethylene; the inner layer is composed of 50%~70% by weight of high melting point blown film grade polyethylene, 5%~25% It is composed of high-grade coating grade polyethylene and 20%~30% metallocene polyethylene. The shrinkage temperature of the low-temperature polyethylene shrink film prepared by using the raw material of the invention can be reduced by 5-15°C, energy consumption can be reduced, production speed can be increased, and production cost can be reduced; film blowing process conditions are stable, temperature control is precise, and production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of shrink film, in particular to a low-temperature polyethylene shrink film and a film blowing process thereof. Background technique [0002] Shrink film is mainly used for sales and transportation of various products, and its main function is to stabilize, cover and protect products, so shrink film must have high puncture resistance, good shrinkage and shrinkage stress. The initial shrink film was mainly PVC. With the continuous improvement of the performance requirements of shrink film, PVC shrink film gradually decreased, while various polyethylene shrink films developed rapidly. Polyethylene shrink film is a kind of material with good toughness. It is widely used in the packaging of alcohol, cans, mineral water, various beverages, cloth and other products. The product has good flexibility, impact resistance, and Strong tear resistance, not easy to break, not afraid of moisture, large shrinkage. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B65D65/40B29C69/02B29C55/28B29C47/60C08L23/06C08L23/08
Inventor 黄镇荣黄卫东罗振华林城全明德
Owner ZHENGXIN PACKAGING CO LTD DONGGUAN
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