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Polyethylene film, packaging composite film and preparation method thereof

A polyethylene film and composite film technology, applied in the field of packaging materials, can solve the problems of unfavorable applications, the impact of packaging barrier properties and mechanical strength, and the limitations of laser easy-to-tear lines, so as to achieve long-term surface tension value and facilitate compounding Good peeling force and tearability

Inactive Publication Date: 2014-12-10
HUANGSHAN NOVEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the laser easy-to-tear line of this packaging has relatively large limitations. It is only a line, and it has a significant impact on the barrier property and mechanical strength of the packaging, which is not conducive to the application

Method used

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  • Polyethylene film, packaging composite film and preparation method thereof
  • Polyethylene film, packaging composite film and preparation method thereof
  • Polyethylene film, packaging composite film and preparation method thereof

Examples

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preparation example Construction

[0052] Correspondingly, the present application also provides a method for preparing the packaging composite film described above, comprising the following steps:

[0053] 1) Composite the polypropylene film and the polyamide film by using the first adhesive to obtain a composite film;

[0054] 2) Composite the polyethylene film and the composite film by using the second adhesive to obtain a packaging composite film.

[0055] see figure 1 , figure 1 The production process flow chart of the packaging composite film provided in the embodiment of this application. In the embodiment of the present application, the first adhesive is used to carry out dry compounding (referred to as dry compounding) of BOPP printing film and KPA film. This is the first compounding (abbreviated as one compounding). BOPP / KPA composite film.

[0056] In the embodiment of the present application, the BOPP printing film is made by printing BOPP, and the KPA film is made by coating K layer with PA. W...

Embodiment 1

[0067] Add the raw materials for the corona layer, the middle layer and the heat-sealing layer respectively into the three barrels of the co-extrusion machine. The formulas of each raw material are as follows:

[0068] Corona layer: 50kg of LLDPE with brand 7042 manufactured by Yangzi Petrochemical and 50kg of HDPE with brand F920;

[0069] Middle layer: 25kg of LDPE with grade 150BW and 75kg of HDPE with grade F920;

[0070] Heat-sealing layer: 25kg Yanshan Petrochemical LDPE with brand 100AC, 75kg mLLDPE with brand SP0510, 1kg silicone slip agent with brand MBSI-002P, 1kg anti-blocking agent with brand AB20LD and 0.2kg with brand 100991-K opening agent.

[0071] Set the first-stage heating temperature of each barrel to 120°C-130°C, the second-stage heating temperature to 130°C-140°C, the third-stage heating temperature to 140°C-150°C, set the die head temperature to 140°C-160°C, and control extrusion The melt pressure is less than 45MPa; the raw material particles in the a...

Embodiment 2

[0074] The difference between this example and Example 1 lies in the raw materials of the corona layer, the intermediate layer and the heat-sealing layer, and the PE film is prepared. The raw material formula of each layer of the present embodiment is as follows:

[0075] Corona layer: 45kg of LLDPE with brand 7042 manufactured by Yangzi Petrochemical and 55kg of HDPE with brand F920;

[0076] Middle layer: 20kg of LDPE with grade 150BW and 80kg of HDPE with grade F920;

[0077] Heat-sealing layer: 80kg Yanshan Petrochemical LDPE with brand 100AC, 20kg mLLDPE with brand SP0510, 1kg silicone slip agent with brand MBSI-002P, 1kg anti-blocking agent with brand AB20LD and 0.2kg with brand 100991-K opening agent.

[0078] The PE film includes a corona layer, an intermediate layer and a heat-sealing layer in sequence, and the thickness ratio of the three layers is 1:1:1, which has good heat-sealing strength and good straight-line tearability.

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Abstract

The invention provides a polyethylene film. The polyethylene film orderly comprises a corona layer, a middle layer and a heat sealing layer; the corona layer is prepared from such raw materials as 45wt%-50wt% of linear low density polyethylene and 50wt%-55wt% of high density polyethylene; the middle layer is prepared from such raw materials as 20wt%-25wt% of low density polyethylene and 75wt%-80wt% of high density polyethylene; the heat sealing layer is prepared from such raw materials as 75wt%-80wt% of metallocene linear low density polyethylene and 20wt%-25wt% of low density polyethylene; the polyethylene film is formed by virtue of co-extrusion blow molding of the raw materials of the corona layer, the middle layer and the heat sealing layer; the blowup ratio of the co-extrusion blow molding is less than 2. The invention also provides a packaging composite film and a preparation method thereof; the packaging composite film comprises the polyethylene film, has excellent straight tear property in addition to good heat sealing strength, and can be applied favorably.

Description

technical field [0001] The present application relates to the technical field of packaging materials, in particular to a polyethylene film, a packaging composite film and a preparation method thereof. Background technique [0002] With the development of packaging technology, plastic films are more and more widely used in the food packaging industry. Among them, high-barrier plastic packaging composite films are one of the fastest-growing functional films. High barrier film refers to the packaging film material that protects the contents of the package, prevents the penetration of pollutants and small molecules such as oxygen, water vapor, liquid and odor, and can also prevent the contents of the package from seeping out. However, the main disadvantage of the high-barrier composite film is that it cannot be torn open in a straight line after being packaged into a bag. [0003] The packaging material that can be torn and opened in a straight line has a linear tearing perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/32B32B27/18B32B7/12B32B37/12
Inventor 江继忠鲍祖本潘健汪学文张和平陈旭
Owner HUANGSHAN NOVEL
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