Blow molding is a process of placing a softened thermoplastic closed-end tube (Parison) and applying air pressure to inflate it.
In operation, the heated Parison is continuously extruded , cut to the proper length and sealed at one end, gripped in the two-piece mold and then air is injected to force the plastic against the walls of the water-cooled mold. The parts cools and then the mold is opened and the part is removed.
Production methods range from simple manual operations to relatively complicated automatic ones. Blow molded products include ducts and similar articles.
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