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Composite film for milk powder packaging

A packaging and composite film technology, applied in the field of edible packaging, can solve the problem of high product cost, achieve good mechanical properties, ensure sealing, and ensure drop resistance.

Active Publication Date: 2018-02-06
永新股份(黄山)包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patent improves the barrier property of milk powder and prolongs the shelf life of milk powder to a certain extent, due to the use of double-stretched biaxially stretched polyamide film in the middle layer, the product cost is relatively high

Method used

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  • Composite film for milk powder packaging

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Experimental program
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Effect test

preparation example Construction

[0026]The preparation method of the polyethylene layer is as follows: the composite layer resin, the intermediate layer resin and the heat-sealing layer resin are respectively added to the three barrels of the extruder, and each barrel is heated in three stages, and the heating temperature of each barrel is 120°C. ~130°C, the second-stage heating temperature is 130-140°C, the third-stage heating temperature is 140-150°C, the die head temperature is set at 140-160°C, and the extrusion melt pressure is controlled to be less than 45Mpa. The polymer particles in the above three barrels are melted by the extruder to form a tube blank. After the tube blank is stretched, compressed air is blown out from the center of the die head of the extruder to blow the tube blank into a bubble-like film. The plastic film is cooled and shaped by an air ring to obtain a polyethylene layer.

[0027] The polyethylene layer composed of the aforementioned composite layer, intermediate layer and heat-s...

Embodiment 1

[0031] Add composite layer resin raw materials, intermediate layer resin raw materials and heat-sealing layer resin raw materials to the three barrels of the co-extrusion machine respectively. The formula of each resin raw material is as follows:

[0032] Composite layer: 150BW for 25kg, 5100G for 50kg;

[0033] Middle layer: 25kg of 150BW, 25kg of 5100G, 25kg of F920A;

[0034] Heat seal layer: 25kg Exxon 100AC, 50kg 5401G, 1kg AB-20LD.

[0035] After the polymer particles in the above three barrels are co-extruded and blow-molded to obtain a polyethylene layer, they are dry-composited with the PET / Al semi-finished product formed by dry compounding to finally form the composite film of the present invention.

Embodiment 2

[0037] The formula of each resin raw material is as follows:

[0038] Composite layer: 150BW for 22.5kg, 5100G for 52.5kg;

[0039] Middle layer: 22.5kg of 150BW, 26.25kg of 5100G, 26.25kg of F920A;

[0040] Heat seal layer: 24.32kg Exxon 100AC, 50.16kg 5401G, 1.52kg AB-20LD. All the other are with embodiment 1.

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Abstract

The invention discloses a composite film for a milk powder package, and the composite film comprises a polyester layer, an aluminium layer, and a polyethylene layer. The polyethylene layer comprises a composite layer, an intermediate layer and a heat-sealing layer in order, wherein the composite layer comprises 30-40wt% of low density polyethylene and 60-70wt% of metallocene polyethylene; the intermediate layer comprises 30-35wt% of low density polyethylene, 30-35wt% of metallocene polyethylene, and 30-35wt% of high density polyethylene; the heat-sealing layer comprises 32-35wt% of low density polyethylene, 63-66wt% of metallocene polyethylene, and 1.3-2.0wt% of an anti-blocking agent. The film has the PET / AL / PE three-layer structure, compared with the conventional four-layer structure, the cost is obviously reduced; at the same time, the composite film also has the advantages of excellent sealing performance, pressure resistance, and falling resistance, and the composite film is especially suitable for the milk powder package.

Description

technical field [0001] The invention relates to the field of food packaging, in particular to a composite film for milk powder packaging. Background technique [0002] In recent years, the fast-moving consumer food industry is gradually rising, and its demand is increasing day by day. More and more consumers have higher and higher requirements for the functional packaging of fast-moving consumer goods. At present, in the milk powder packaging market at home and abroad, there are many types of packaging, mainly divided into cans and bags. Filled milk powder has a long shelf life, but the packaging cost is relatively high. The packaging cost of bagged milk powder will be greatly reduced, but due to the unreasonable selection of materials and structure, the shelf life is often relatively short. The current conventional structure of milk powder packaging is Four-layer structure of PET / AL / BOPA / PE. [0003] Another example is that the Chinese patent application No. 201310493815....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/085B32B15/09B32B15/20B32B27/08B32B27/32B32B33/00B32B37/10B65D65/40B29D7/01C08L23/08C08L23/06
CPCB29D7/01B32B15/085B32B15/09B32B15/20B32B27/08B32B27/327B32B33/00B32B37/10B32B2307/50B32B2307/54B32B2307/5825B32B2307/734B32B2307/75B65D65/40C08L23/06C08L23/0815C08L2205/02C08L2205/025C08L2205/03C08L2207/066
Inventor 潘健胡继超张春生王卫民张军林镇海
Owner 永新股份(黄山)包装有限公司
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