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Plastic bottles plastic bottle molding process is mainly extrusion blow (shampoo bottle kind) and injection blow molding (Coke bottle that). Extrusion blow molding and injection blow molding process for plastic bottles two differences are: injection molding, for molding plastic bottles to include male and female mold. By an injection machine under high pressure melt the plastic into the mold cavity, the cavity is opened, the male mold must be removed from the female mold to the top of the bottle. In extrusion blow molding, extrusion die to be molded preform. Blow mold consists of two mold half shade structure, generally without the male die by injection of compressed air blown parison. Compared with injection blow extrusion blow extrusion blow molding is characterized by: low (1) blow molding machinery (especially blow mold) cost, for example, when the same product molding, blow molding machinery, injection molding machines cost about one-third or one-half of production costs are lower. (2) on the blow molding, the parison is molded at low pressure through the extrusion die and at low pressure (mostly 0.2-1.0Mpa) lower inflation, and therefore a smaller residual stress products, tensile resistance, impact high performance, bending and various environmental strain, with better performance. In injection blow molding, the plastic melt to the high pressure (15-140Mpa) under through mold runner and gate, which leads to uneven distribution of stress. (3) blow molding grade plastics (such as PE) is much higher than the molecular weight of the plastic injection molding grade. Such blow molding products having high impact toughness and high resistance to environmental stress cracking resistance, which produce large volumes of plastic bottles is very favorable. (4) Due to the blow mold composed of only the die, so you can change the wall thickness of the bottle by simply adjusting the nose die gap or extrusion conditions, this product can not be accurately calculated in advance the desired wall thickness is very advantageous. The injection molding is necessary to change the thickness of the product cost is much higher.

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