Plastic bottles are generally used in the production of hollow equipment, the production of plastic bottles called hollow extruder. Hollow machine production of products have a characteristic, in the middle is empty, is by blowing into compressed air. And the injection molding machine products if the middle is empty there must be a corresponding mold to form a cavity, there is bound to have a release of the problem. So, the bottle mouth of the plastic injection machine must be bigger than the inside, otherwise it can not be separated from the mold.

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