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Packaging polyolefin film and preparation method thereof

A polyolefin and film technology, applied in the field of polyolefin biaxially oriented film and its preparation, can solve the problems of poor physical and heat-sealing properties of PP stretched film, easy shrinkage, etc., and achieve excellent heat-sealing characteristics, low shrinkage rate, high intensity effect

Active Publication Date: 2013-05-08
ZHEJIANG ZHONGCHENG PACKING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PE is very easy to shrink after biaxial stretching, so it is mainly used for heat shrinkable films, and shrinkage will occur at the heat seal when the packaging composite film is applied
PP stretch film has extremely poor physical and heat sealing properties, so it is mainly used for printing substrate films

Method used

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  • Packaging polyolefin film and preparation method thereof
  • Packaging polyolefin film and preparation method thereof
  • Packaging polyolefin film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment

[0065] The BOPE stretched composite film is produced on a 5-layer co-extrusion tubular film biaxial stretching equipment, and its structure is shown in Table 1 below. Films 9 and 10 are PE films produced by conventional blow molding, and their structures are shown in Table 2.

[0066] The structure of the film (total thickness: 35 μ) of the present invention is shown in Table 1:

[0067] Table 1: Thin film structure of the present invention

[0068]

[0069] Table 2: Comparative film (total thickness: 50 microns) structure

[0070]

[0071]

[0072] The details of the materials used are shown in Table 3:

[0073] Table 3: Raw materials used

[0074]

[0075] The production of film 1-8 is produced on the production line of tubular film biaxial stretching process, and the specific process is as follows:

[0076] 1. Extrusion of polyolefin raw materials;

[0077] 2. Forming a circular first tube membrane through the ring head;

[0078] 3. The cooling water se...

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Abstract

The invention provides a coextruded biaxially-oriented polyolefin film. The coextruded biaxially-oriented polyolefin film comprises a composite layer, an intermediate layer and an heat sealing layer, wherein the composite layer, the intermediate layer and the heat sealing layer are in coextruded structures and contain propylene polymer, ethylene polymer and the blend or mixture of the propylene polymer and the ethylene polymer respectively. The ratio of the longitudinal elongation of the biaxially-oriented polyolefin film to the transverse elongation is less than 1:6, and the ratio of the longitudinal elongation to the transverse elongation is less than 8% at the temperature of 90 DEG C. The invention further provides a composite packaging structure with a substrate and the biaxially-oriented polyolefin film and a method for preparing the biaxially-oriented polyolefin film.

Description

[0001] This application is a divisional application of the Chinese patent application (National Application No. 201110127215.6) with the application date of May 18, 2011, entitled "Polyolefin Film for Packaging and Its Preparation Method". technical field [0002] The invention relates to a multi-layer co-extruded polyolefin biaxially stretched film for packaging and a preparation method thereof. Background technique [0003] Polyethylene film (PE film) has the advantages of light weight, non-toxic, moisture-proof, and excellent heat-sealing performance. It is widely used in the packaging of food, medicine, daily light industry, and sanitary products. One of the main uses of polyethylene film is to use it as a composite base film in the flexible packaging industry to provide heat sealability, physical strength, such as puncture resistance, drop resistance and other properties. [0004] Composite structures are widely used in the flexible packaging industry. Biaxially orient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/06B29C69/00
Inventor 陈大魁
Owner ZHEJIANG ZHONGCHENG PACKING MATERIAL
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