Hollow blow molding is pided into injection blow molding, extrusion blow molding and stretch blow molding, injection blow molding is to make the material into a bottle embryo, and then move the embryo into the blow molding mold for next step blowing. From the die parting surface of the hole into the compressed air, so that the mold embryo blowing expansion and sticking to the mold wall and forming.

Keep pressure, after the product is cooled and set in the cavity, open the mold and take out the finished product. In the process of extrusion blow molding, the tube embryo is extruded directly from the extruder and hung vertically in the pre-separated cavity directly below the machine head; When the drooping embryo reaches the specified length, the mold is closed immediately and the tube embryo is cut off by the cutting of the mold.

The simple way to distinguish between blowing molding and injection molding (including injection blowing) is to observe the bottom of the product, the bottom of which has a navel-like injection molding point is injection molding or injection blowing molding, while blowing molding has a joint line at the product bottom.

For the hollow blow molding, the most commonly used raw materials are PET, HDPE, PP, PVC and thermoplastic polyester, etc., commonly used to form a variety of liquid packaging containers, which HDPE and PET material accounted for a large part. For high density polyethylene, commonly known as HDPE, with heat resistance, hardness, mechanical strength and good chemical resistance.

It is a non-toxic and safe material and is often used in the production of plastic food containers. For the Polyethylene terephthalate, also is referred to as PET, its application has developed from carbonated beverage to beer bottle, edible oil bottle, condiment bottle, medicine bottle, cosmetics bottle, and more applications are being developed.

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