Blow Molding

Name:
Blow Molding
Detailed information:
A technique for production of hollow thermoplastic products. It involves placing an extruded tube (parison) of the thermoplastic in a mold and applying sufficient air pressure to the inside of the tube to cause it to take on the conformation of the mold. Polyethylene is usually used, but a number of other materials are adaptable to this method, e.g., cellulosics, nylons, polypropylene, and polycarbonates. It is an economically efficient process and especially suitable for production of toys, bottles, and other containers, as well as air-conditioning ducts and various industrial items. The method is not limited to hollow products; housings can be made by blowing a unit and sawing it along the parting line to make two housings.