A method of fabrication in which a warm plastic parison (hollow tube) is placed between the two halves of a mold cavity and forced to assume the shape of that mold cavity by the use of air pressure Pressurized air is introduced into the inside of the parison through a blow pin thereby forcing the plastic parison against the surface of the mold that defines the shape of the product
A widely used process for the production of hollow thermoplastic shapes The process is divided into two general categories: extrusion blow molding and injection blow molding These processes are typically used to manufacture plastic bottles and containers (Modern Plastics Encyclopedia 1995) Extrusion Blow Molding: A parison or tube of plastic material is dropped or lowered from an extruder Mold halves close around the parison, which is then expanded against the cavity wall by the injection of air (Modern Plastics Encyclopedia 1995)
A method of fabrication in which a warm plastic hollow tube is placed between the two halves of a mold (cavity) and, by using air pressure, the hollow tube is forced to assume the shape of the cavity The air pressure is introduced through the inside of the hollow tube The air pressure forces the plastic against the surface of the mold that defines the shape of the container