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Casting polypropylene (CPP) membrane for paper packaging and preparation method thereof

A technology for film and paper products, applied in the field of CPP film for paper product packaging and its preparation, can solve the problems of poor heat-sealing and printing adaptability, reduced heat-sealing performance, too hard texture, etc., and achieve good double-sided heat-sealing performance , high smoothness on both sides and satisfactory mechanical properties

Active Publication Date: 2011-02-09
HUANGSHAN NOVEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] First of all, the hardness of this kind of film is too high. As a paper packaging material, it feels too stiff, which is not conducive to consumers' judgment on the softness and quality of paper products.
[0007] Secondly, after corona treatment of homopolymerized PP, its heat sealing performance is greatly reduced, and the heat sealing conditions of the film corona surface are relatively high.
[0008] Finally, the addition of slip agent will greatly accelerate the decline of the surface tension value of the homopolymer PP film, which also reduces the adhesion of the film to the ink and increases the difficulty of printing.
[0009] Therefore, the existing homopolymer PP film is not only too hard, but also has poor heat sealability and printing adaptability.

Method used

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  • Casting polypropylene (CPP) membrane for paper packaging and preparation method thereof
  • Casting polypropylene (CPP) membrane for paper packaging and preparation method thereof
  • Casting polypropylene (CPP) membrane for paper packaging and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0039] The present invention also provides the preparation method of the above-mentioned CPP film for paper product packaging, comprising:

[0040] a) co-extruding the outer layer resin, the middle layer resin and the inner layer resin at 210°C to 250°C to obtain a hot-melt film including the outer layer, the middle layer and the inner layer in sequence;

[0041] b), casting and cooling the hot-melt film;

[0042] c), corona treatment is carried out on the outer layer of the film after casting cooling and setting, and the CPP film used for paper product packaging is obtained;

[0043] Wherein, the outer layer resin includes 98wt% to 99.5wt% terpolymerized polypropylene and 0.5wt% to 2wt% slip agent; the middle layer resin is homopolypropylene; the inner layer resin includes 98wt% to 99.5wt% binary copolymerized polypropylene and 0.5wt%-2wt% slip agent.

[0044] In the present invention, the outer layer resin, the middle layer resin and the inner layer resin are preferably re...

Embodiment 1

[0049] Add the outer layer resin raw material, the middle layer resin raw material and the inner layer resin raw material respectively into the three barrels of the co-extrusion machine, and the formulas of each resin raw material are listed in Table 1.

[0050] The raw materials in the three barrels are co-extruded and then enter the casting station to cool and shape. Temperature: 245° C.; the surface temperature of the casting roll is set at 30° C. in the casting process. Air knife up and down position: 90%; air knife speed: 50%; vacuum box wind speed: 35%; air knife horizontal position: 18%; air knife pressure: 5.2mbar; vacuum box pressure: 1.2mbar.

[0051] Carry out corona treatment on the outer surface of the cast film after corona treatment, set the corona treatment power to 8.5KW, and the corona roller pressure to 3bar. After corona treatment, a paper packaging CPP film is obtained. The thickness ratio of the layer, middle layer and inner layer is 1:8:1.

Embodiment 2～ Embodiment 5

[0053] The preparation process of the CPP film of the above example is the same as that of Example 1, the raw material formula is listed in Table 1, and the process parameters are listed in Table 2.

[0054] The total thickness of the films prepared in the above four examples is 40 μm, wherein the thickness ratio of the film outer layer, middle layer and inner layer prepared in Example 2 is 1:6:1

[0055] The thickness ratio of the film outer layer, middle layer and inner layer prepared in embodiment 3 is 1: 9: 1;

[0056] The thickness ratio of the film outer layer, middle layer and inner layer prepared in embodiment 4 is 1: 7: 1;

[0057] The thickness ratio of the outer layer, middle layer and inner layer of the film prepared in Example 5 is 1:8:1.

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Abstract

The invention provides a casting polypropylene (CPP) membrane for paper packaging. The membrane is characterized by comprising a corona layer, an intermediate layer and an inner layer, wherein the corona layer comprises 98 to 99.5 weight percent of terpolymerization polypropylene and 0.5 to 2 weight percent of slip agent; the intermediate layer is homo-polymerization polypropylene; and the inner layer comprises 98 to 99.4 weight percent of binary polymerization polypropylene and 0.5 to 2 weight percent of slip agent. The invention also provides a preparation method of the membrane. Both surfaces of the CPP membrane for paper have high heat-seal performance, and high printing adaptability and moderate flexibility.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a CPP film used for paper product packaging and a preparation method thereof. Background technique [0002] CPP film is a polypropylene film produced by a cast extrusion process, also known as unstretched polypropylene film. Compared with polyethylene film, polyester film and polyvinyl chloride film, CPP film not only has lower cost, but also has the characteristics of high gloss, good flatness, balanced vertical and horizontal properties, easy heat sealing and easy metallization treatment. Moreover, CPP film can also be aluminized, printed or compounded with other materials after corona treatment. Therefore, CPP film is widely used as packaging materials for food, daily necessities and electronic products. [0003] In addition to the above advantages, CPP film also has excellent barrier properties to moisture and odor, and has high transparency, which is especially suitable f...

Claims

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Application Information

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IPC IPC(8): B65D65/40B32B27/32B32B27/18B32B27/08
Inventor 江继忠鲍祖本潘健张和平
Owner HUANGSHAN NOVEL
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