Plastic is a very light material with a very low temperature heating can soften it, want to make all kinds of shapes of things. Plastic colorful, light weight, not afraid of wrestling, economic and durable, it's come to people's lives not only brought a lot of convenience, and promote industrial development, but also to bring great threat to the human environment. Since plastics are extracted from petroleum or coal chemical petroleum products, once produced is difficult to natural degradation. And packing bag manufacture with products cheaper and more people in the 100 years that he does not need to buy too many things, this is not accompanied by moderate consumption concept of continuous improvement and plastics technology intensified. GE Plastics has five varieties, namely polyethylene, polypropylene, polyvinyl chloride, polystyrene and ABS. They are thermoplastic. 1 Polyethylene (PE) Plastics industry the highest yield varieties, is widely used in packaging, construction, agricultural, industrial and consumer markets, film, opaque or translucent, lightweight crystalline plastic, with excellent low temperature properties (lowest temperature up to -70 ? ~ -100 ?), electrical insulation, chemical stability, resistance to most acid-base erosion, but not heat. Polyethylene appropriateness of using injection molding, blow molding, extrusion and other processing methods. 2 polypropylene (PP) Obtained by the polymerization of propylene thermoplastic, is colorless, translucent solid, odorless, non-toxic, a density of 0.90 kg/m3 ~ 0.919 kg/m3, the lightest of the common plastic, the OPP Plastic Bag advantage is resistance in the water has cooking characteristics, corrosion resistance, strength, rigidity and transparency better than polyethylene, the disadvantage is poor low temperature impact resistance, easy to aging, but can be modified and add additives respectively, through to be improved. Polypropylene production methods slurry, liquid bulk and gas phase three kinds. 3 Polyvinyl chloride (PVC) Obtained by the polymerization of vinyl chloride plastic, by adding a plasticizer, the hardness can be greatly changed. It is made of hard products as well as soft products have a wide range of uses. Production of PVC suspension polymerization method, emulsion polymerization and bulk polymerization, a suspension polymerization based. 4 polystyrene (PS) Styrene polymers, transparent appearance, but there are shortcomings of crisp, therefore, polybutadiene can be made by adding impact-resistant polystyrene (HTPS). The main production methods polystyrene bulk polymerization, suspension polymerization and solution polymerization. 5.ABS resin Acrylonitrile / butadiene / styrene co-polymer product of three monomers, called ABS terpolymer. The plastic components due to A (acrylonitrile), B (butadiene) and S (styrene) in different proportions of the composition, and manufacturing method of the differences, OPP Plastic Bag wholesale which are very different nature. ABS is a combination of injection molding and extrusion, so its use is mainly produce two types of products.
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