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What Is The Difference Between Injection Molding And Blow Molding?

Release time:2020-10-14

Blow' target='_blank'>' target='_blank'>molding is widely used to inflate a hot parison that is closed in a mold into a hollow product by gas pressure, or a method in which a tube parison is inflated into a tube film. This method is mainly used in the manufacture of various packaging containers and tubular membranes. As long as the melt index is 0.04~1.12, it is a relatively good hollow blow molding material, such as polyethylene, polyvinyl chloride, polypropylene, polystyrene, thermoplastic polyester, polycarbonate, polyamide, cellulose acetate and Polyacetal resin or the like, in which polyethylene is most used.

Injection blow molding is carried out by injection molding into a bottomed parison, and then the parison is moved into a blow mold to be blown into a hollow product.

In extrusion blow molding, the plastic is first formed into a bottomed parison by extrusion, and then the parison is moved into a blow mold to be blown into a hollow product. Stretch blow molding is a blow molding of biaxially oriented stretching by first stretching the form longitudinally and then inflating with compressed air to achieve transverse stretching. Stretch blow molding can greatly improve the transparency, impact strength, surface hardness and rigidity of the product, and is suitable for blow molding of polypropylene and polyethylene terephthalate (PETP).

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