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A packaging and composite film technology, applied in the field of edible packaging, can solve the problem of high product cost, and achieve the effects of good mechanical properties, good environmental protection, and excellent heat sealing performance.
Active Publication Date: 2016-09-28
永新股份(黄山)包装有限公司
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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 certai
Method used
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preparation example Construction
[0026] The preparation method of the polyethylene layer is as follows: add the composite layer resin, the middle layer resin and the heat-sealing layer resin into the three barrels of the extruder, and heat each barrel in three stages, and the heating temperature of each barrel is 120 ~130℃, the second-stage heating temperature is 130-140℃, the third-stage heating temperature is 140-150℃, the die temperature is 140-160℃, 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 and formed into a tube blank. After the tube blank is stretched, compressed air is blown out from the center of the extruder die head to inflate the tube blank into a bubble film, and the bubble The shaped 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-sealing layer has excellent heat-seal...
Embodiment 1
[0031] Add the composite layer resin raw material, the intermediate layer resin raw material and the heat-sealing layer resin raw material into the three barrels of the co-extrusion machine. The formula of each resin raw material is as follows:
[0032] Composite layer: 25kg of 150BW, 50kg of 5100G;
[0033] Middle layer: 25kg of 150BW, 25kg of 5100G, 25kg of F920A;
[0035] After the polymer particles in the above three barrels are co-extrusion blow-molded to obtain a polyethylene layer, dry composite with the PET / Al semi-finished product formed by dry composite to form the composite film of the present invention.
Embodiment 2
[0037] The resin raw material formula is as follows:
[0038] Composite layer: 22.5kg of 150BW, 52.5kg of 5100G;
[0039] Middle layer: 22.5kg of 150BW, 26.25kg of 5100G, 26.25kg of F920A;
[0040] Heat sealing layer: 24.32kg Exxon 100AC, 50.16kg 5401G, 1.52kg AB-20LD. The rest is the same as in Example 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 edible 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. More and more consumers have higher and higher requirements for functional packaging of fast-moving consumer goods. At present, in the domestic and foreign milk powder packaging market, there are many types of packaging, mainly divided into canned and bagged. Filled milk powder has a long shelf life, but the packaging cost is relatively high. The packaging cost of bagged milk powder will drop significantly. However, due to the unreasonable material structure selected, 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 the Chinese Patent Application No. 201310493815.3 discloses a high barr...
Claims
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Application Information
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