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Three-layer co-extrusion heavy packaging film and preparation method thereof

A three-layer co-extrusion, packaging film technology, used in packaging, wrapping paper, transportation and packaging, etc., can solve the problems of poor stiffness and thermal deformation, high heat sealing temperature, package rupture, etc., and achieve good stiffness. , The effect of high friction coefficient and low heat sealing temperature

Active Publication Date: 2020-08-04
GUANGZHOU XINWEN PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, heavy packaging film products have only been trial-produced in China since 2001, and are still in the initial stage of application. The product formula is not yet mature and is still in the process of continuous improvement and perfection. The quality of the product fluctuates greatly. Lack of special resin grades
At present, the domestic heavy packaging film is mainly produced by LLDPE / LDPE blended resin and various additives as raw materials. Due to the variety of blended resins and additives, this method is easy to cause difficult production, high cost, and uneven product quality.
In addition, the blending of LDPE / LLDPE to produce heavy packaging film is prone to low mechanical strength and heat sealing strength, poor stiffness and thermal deformation, resulting in frequent accidents such as slow filling speed and package body rupture. In severe cases, it is difficult to use Automatic packaging line maintains fast production
At the same time, heavy packaging films also have application problems such as palletizing and sliding, and high heat sealing temperature, which affect the use of heavy packaging films.

Method used

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  • Three-layer co-extrusion heavy packaging film and preparation method thereof
  • Three-layer co-extrusion heavy packaging film and preparation method thereof

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preparation example Construction

[0071] The preparation raw materials of the inner layer, the middle layer and the outer layer of the present invention are weighed and configured separately to obtain the mixture of the inner layer, the middle layer and the outer layer, and then the inner layer mixture and the middle layer are mixed according to the weight ratio of the inner layer, the middle layer and the outer layer material and outer layer mixture.

[0072] The standards of the parts by weight of the inner layer, the middle layer and the outer layer are different in the present invention.

[0073] The second aspect of the present invention provides a method for preparing a three-layer co-extrusion heavy-duty packaging film, which includes: respectively transporting the preparation raw materials of the inner layer, the middle layer and the outer layer to three extruders. After being plasticized in the exiting machine, they are transported to the same three-layer blown film die head, and the inner layer, midd...

Embodiment 1

[0078] Embodiment 1 of the present invention provides a kind of three-layer co-extrusion heavy packaging film, and it comprises inner layer, middle layer and outer layer three parts that are arranged sequentially from inside to outside; By weight, the preparation raw material of described inner layer comprises 20 parts of low-density polyethylene, 30 parts of metallocene polyethylene, 15 parts of polyolefin elastomer, 0.5 part of open smooth masterbatch; by weight, the preparation raw materials of the middle layer include 10 parts of metallocene polyethylene, 10 parts of Low-density polyethylene, 5 parts of high-density polyethylene, 2 parts of color masterbatch; by weight, the preparation raw materials of the outer layer include 20 parts of low-density polyethylene, 30 parts of metallocene polyethylene, 15 parts of polyolefin elastic body.

[0079] In the inner layer, the melt index of the low-density polyethylene is 0.25g / 10min, which is purchased from Shanghai Kaiyi Plastic...

Embodiment 2

[0085]Embodiment 2 of the present invention provides a kind of three-layer co-extrusion heavy packaging film, and it comprises inner layer, middle layer and outer layer three parts that are arranged sequentially from inside to outside; By weight, the preparation raw material of described inner layer comprises 50 parts of low-density polyethylene, 31.5 parts of metallocene polyethylene, 45 parts of polyolefin elastomer, 5 parts of open smooth masterbatch; by weight, the preparation raw materials of the middle layer include 40 parts of metallocene polyethylene, 30 parts of Low-density polyethylene, 35 parts of high-density polyethylene, 10 parts of color masterbatch; by weight, the preparation raw materials of the outer layer include 50 parts of low-density polyethylene, 31.5 parts of metallocene polyethylene, 45 parts of polyolefin elastic body.

[0086] In the inner layer, the melt index of the low-density polyethylene is 0.75g / 10min, which is purchased from Suzhou Pengran Pla...

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Abstract

The invention relates to the field of packaging films, in particular to a three-layer co-extrusion heavy packaging film and a preparation method thereof. The three-layer co-extrusion heavy packaging film comprises an inner layer, a middle layer and an outer layer which are sequentially arranged from inside to outside. The three-layer co-extrusion heavy packaging film provided by the invention hasthe advantages of good stiffness, high surface friction coefficient of the heavy packaging film, no stack slipping, low heat-sealing temperature, wide heat-sealing window, heat-sealing temperature aslow as 100 DEG C and heat-sealing window of 140 parts + / -40 DEG C, can meet the requirements of enterprises with special downstream packaging requirements, and realizes on-line continuous rapid packaging. Compared with a traditional heavy packaging bag, the packaging bag can be used in areas requiring low temperature and large heat sealing environment change difference.

Description

technical field [0001] The invention relates to the field of packaging films, more specifically, the invention relates to a three-layer co-extruded heavy packaging film and a preparation method thereof. Background technique [0002] As we all know, heavy packaging film has become a common heavy packaging material in developed countries such as Europe and the United States. It is a new type of packaging material developed in China in recent years. A new type of packaging film product with multiple processes and operations such as material, heating and sealing. This kind of film can meet the needs of high-speed filling, large-scale storage and transportation, and automatic palletizing of large-scale production automatic packaging lines. cost. At present, with the rapid increase in the scale of synthetic resin plants in China, traditional paper composite films and woven bags are far from meeting the needs of today's large-scale industrial production. Heavy-duty packaging fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32B32B33/00B65D65/40
CPCB32B27/08B32B27/32B32B33/00B65D65/40B32B2307/31Y02W30/80
Inventor 陆伟錩
Owner GUANGZHOU XINWEN PLASTIC
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