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High-transparency and high-strength heat shrinkage film

A high-transparency, heat-shrinkable film technology, used in the field of packaging materials, can solve the problem of difficulty in achieving both strength and transparency of heat-shrinkable films, and achieve the effects of increasing heat shrinkage, improving stretchability, and saving raw materials.

Inactive Publication Date: 2017-07-21
杭州德雅包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a high-transparency and high-strength heat-shrinkable film, which solves the problem that the strength and transparency of the existing heat-shrinkable film are difficult to have at the same time

Method used

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  • High-transparency and high-strength heat shrinkage film

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment is a heat-shrinkable film with high transparency and high strength, which is composed of an inner layer, an outer layer and a middle layer. Wherein, by weight percentage, the inner layer and the outer layer are composed of 50% mLLDPE and 50% LLDPE, and the middle layer is composed of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.

[0030] In this example, the melt index of mLLDPE is 0.5g / 10min, and the density is 0.920g / cm 3 ;The melt index of LLDPE is 0.3g / 10min, and the density is 0.925g / cm 3 ; The melt index of LDPE is 0.3g / 10min, and the density is 0.923g / cm3.

[0031] The preparation method of the high-transparency and high-strength heat-shrinkable film is as follows:

[0032] (1) Weighing the raw materials of the inner layer, the outer layer and the middle layer respectively according to the preset weight percentage;

[0033] (2) After mixing the raw materials of the inner layer, the outer layer and the middle layer respectively, put them into th...

Embodiment 2

[0036] This embodiment is a heat-shrinkable film with high transparency and high strength, which is composed of an inner layer, an outer layer and a middle layer. Wherein, by weight percentage, the inner layer and the outer layer are composed of 60% mLLDPE and 40% LLDPE, and the middle layer is composed of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.

[0037] In this example, the melt index of mLLDPE is 0.3g / 10min, and the density is 0.946g / cm 3 ;The melt index of LLDPE is 0.11g / 10min, and the density is 0.944g / cm 3 ;The melt index of LDPE is 0.3g / 10min, the density is 0.920g / cm 3 .

[0038] The preparation method of this high-transparency and high-strength heat-shrinkable film is the same as in Example 1.

Embodiment 3

[0040] This embodiment is a heat-shrinkable film with high transparency and high strength, which is composed of an inner layer, an outer layer and a middle layer. Wherein, by weight percentage, the inner layer and the outer layer are composed of 70% mLLDPE and 30% LLDPE, and the middle layer is composed of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.

[0041] In this example, the melt index of mLLDPE is 0.2g / 10min, and the density is 0.950g / cm 3;The melt index of LLDPE is 0.5g / 10min, and the density is 0.920g / cm 3 ;The melt index of LDPE is 0.25g / 10min, and the density is 0.920g / cm 3 .

[0042] The preparation method of the high-transparency and high-strength heat-shrinkable film is the same as in Example 1.

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Abstract

The present invention discloses a high-transparency and high-strength heat shrinkage film, which comprises an inner layer, an outer layer and a middle layer, wherein the inner layer and the outer layers respectively comprise, by weight, more than or equal to 50% of mLLDPE and less than or equal to 50% of LLDPE, the melt indexes of mLLDPE and LLDPE are less than or equal to 0.5 g / 10 min, and the densities of mLLDPE and LLDPE are greater than or equal to 0.920 g / cm<3>. According to the present invention, the inner layer and the outer layer only comprise mLLDPE and LLDPE, and do not use auxiliary agents and other polyethylene materials, such that the formula is simple, and the raw materials are saved; and by using mLLDPE having low melting index and high density and LLDPE having low melting index and high density, the heat shrinkage film has advantages of high tensile strength (more than 30 N), good transparency (the mist degree is 8-15%), good heat-sealing strength (the heat-sealing strength of the existing heat shrinkage film is about 20-25 N while the heat shrinkage film of the present invention is 30-40 N), and good refractive index (more than 90%).

Description

technical field [0001] The invention relates to a packaging material, in particular to a heat-shrinkable film with high transparency and high strength. Background technique [0002] Heat shrinkable film is widely used in food, medicine, disinfection tableware, stationery, craft gifts, printed matter, metal and plastic products, telephones, electronic appliances and other products, especially in the combination of irregular shaped items or commodities In terms of traditional (cluster) packaging, the heat shrinkable film can not only meet the functions of moisture-proof and dust-proof, touch-proof, transparent display and other functions of the product, but also increase the attractiveness of the product appearance. This characteristic of heat shrinkable film makes it possible to replace various cartons for packaging products, which not only saves packaging costs, but also conforms to packaging trends. [0003] The Chinese patent application whose publication number is CN 101...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32
CPCB32B27/08B32B27/32B32B2250/03B32B2250/242B32B2307/412B32B2307/418B32B2553/00
Inventor 蒋招晓蒋招启
Owner 杭州德雅包装有限公司
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