Example 115 Biaxially oriented polypropylene film

日期:2020/1/10 9:24:27 / 阅读: / 来源:本站

Section 1

Example 115 Biaxially oriented polypropylene film

Biaxially oriented polypropylene film (BOP) has the advantages of light weight, transparency, non-toxicity, fullness, and water resistance. It has good thermal stability, chemical stability, and electrical properties. , Pharmaceutical, fruit juice, milk, textile and other packaging, as well as electrical appliances, adhesive tape production are widely used. In recent years, the production of BOPP has adopted seven new technologies to make BOPP evenly distributed in the central gas barrier layer with acrylonitrile-butadiene copolymer, effectively blocking oxygen, carbon dioxide, water vapor and other rotten substances The entry has greatly increased the anti-corrosion ability of the packaged materials and prolonged the storage period of the articles. Therefore, people have given this kind of BOPP film with a gas barrier layer a "packaging queen".

Main raw material

BOPP film is made of isotactic PP as the main raw material, and it is made of additive masterbatch with a mass fraction of 3% to 5% according to different products and uses. Raw materials should be selected from film grade PP homopolymer

And should have the following characteristics: ① melt flow rate is 1.5-4.0y10min; ② isotacticity

5% to 98%: ③ moisture content <0, 03%: ① ash <0.2x10. Additives are

や "The first film is used to support the ingredients. Generally, erucic acid amine lubricants, ethylene diamine antistatic agents, and antifreeze agents containing silica particles are generally used to improve the surface properties of the products.

2

Main equipment and basic process

The equipment is mainly manufactured by professional companies of BOPP automatic production line. Companies that can provide complete BOP equipment technology are: Japan's Mitsubishi Heavy Industries (MT-SUBISH) and Toshiba (TOSHIBA); France's CELLIER; Germany's BRUCKNER, LENZING and MARSALL Wait. Among these competitive technologies, Mitsubishi Heavy Industries and Bruckner are more advanced. Mitsubishi Heavy Industries' technology is characterized by tandem twin-screw extrusion and multi-roll cooling molding; Bruckner is known for multi-machine co-extrusion, twin-cylinder filtration of large roll water bath chilling, and reasonable use of additives. Mitsubishi Heavy Industries' twin-screw extrusion series, good plasticization of PP, uniform and stable pressure, small lateral shrinkage of thick slabs, good tolerances of thick slabs, but multi-roller cooling process conditions are narrow, cooling is slow, large-scale high-speed production is limited. Bruckner's multi-machine co-extrusion, using different combinations of extruders and matching dies, can produce light films and multilayer films: using a dual-cylinder filter device, which can remove filters while producing; using large roller internal cooling The external cooling of the water bath enables the molten magnetic material to quickly pass through the crystallization temperature zone and quench to room temperature.

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Production; using additives to adjust the formula, the product has great variability and good film properties. But the water bath is chilling

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