Cast polypropylene membrane

A polypropylene film, terpolymer polypropylene technology, applied in the direction of flexible covering, packaging, layered products, etc., can solve the problems of poor air tightness and inability to meet, and achieve good heat sealing strength and low sealing temperature. , the effect of high transparency

Active Publication Date: 2015-12-23
湖北宏裕新型包材股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, poor air tightness and chronic air leakage still exist after inflated packaging, which cannot meet the requirements of high-speed (≥180 packs / min) inflated automatic packaging

Method used

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  • Cast polypropylene membrane

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Embodiment Construction

[0018] Such as figure 1 As shown, the resin pellets are batched, dried, and stirred using the following ratio, and then added to the three-layer co-extrusion casting equipment, corresponding to the inner, middle, and outer three-layer screw machine hoppers.

[0019] Inner layer: 50% terpolymer polypropylene by weight, 37% propylene-based elastomer, 10% ethylene-vinyl acetate copolymer and 3% antiblocking agent.

[0020] Middle layer: 60% propylene-based elastomer, 40% metallocene polyethylene by weight

[0021] Outer layer: 100% random copolymer polypropylene resin by weight.

[0022] Among them, all the above-mentioned resins have a melt index of 3-8, are set to be extruded at a temperature of 160-270°C, and are treated with a cooling corona (the outer layer of corona is polarized with a guide roller type 2KV voltage, and the treatment intensity is 42-50 Dyne), after slitting, a modified CPP heat-sealing film with a thickness of 30 μm is formed. Then with the 18μm thick bi...

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Abstract

A cast polypropylene (CPP) membrane is formed by performing three-layer co-extrusion by a casting machine, and possesses a three-layer structure comprising an outer layer, a middle layer and an internal layer. The internal-layer material is formed by blending 50% by weight of terpolymerization polypropylene, 40% by weight of allyl elastomer and 10% by weight of vinyl-vinyl acetate copolymer. The middle-layer material is formed by blending allyl elastomer and metallocene polyethylene, wherein allyl elastomer accounts for 60%-90% by weight. The outer-layer material employs homopolymerization polypropylene or random copolymerization polypropylene resin. The fusion index of all of the above resin is 3-8, the inner-layer thickness is 10 mu m or more, the cast polypropylene membrane is formed through three-layer co-extrusion casting equipment and forms a composite packaging membrane. The airtightness, and toughening and compatibility technical problems of a conventional CPP material are solved. The modified atmosphere packaging high airtightness and high-speed pillow-type automatic packaging (HFFS) requirements are satisfied, and the membrane is especially suitable for baking foodstuff inflation pressure-resistant packaging.

Description

technical field [0001] This patent relates to the modification of a polypropylene film for inflatable food packaging, especially a preparation method of a high airtight polypropylene co-extruded cast film. Background technique [0002] At present, cast polypropylene (CPP) has been widely used in the packaging of food, medicine, daily chemicals, electronics and other fields due to its unique high transparency, fragrance retention performance and heat sealing performance. Existing co-extruded cast CPP films are mostly prepared from polypropylene through a three-layer or multi-layer co-extruded cast process. However, after the traditional CPP film is inflated and packaged, especially in the process of food high-speed pillow packaging (HFFS), due to the poor air tightness of the CPP cast film, the leakage rate is high (greater than 5 per thousand), which is extremely large. The shelf life of the food is affected, and the compressive strength and impact strength of the packaging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/30B32B27/32B32B33/00B65D65/40
CPCB32B27/08B32B27/30B32B27/306B32B27/308B32B27/32B32B27/327B32B33/00B32B2307/7242B65D65/40
Inventor 邓锐俞学锋李知洪梅海金邹家武
Owner 湖北宏裕新型包材股份有限公司
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