Internal inflation process

Laminating the two halves, then using the internal inflation process with wet-in-wet laminates (see Fig. 15.29). 

Sequences of the production of a rib according to choice 2, internal inflation process. 

Film blowing (blown-film extrusion). The process of forming thermoplastic film wherein an extruded plastic tube is continuously inflated by internal air pressure, cooled, collapsed by rolls, and subsequently wound into rolls on thick cardboard cores. The tube is usually extruded vertically upward, and air is admitted through a passage in the center of the die as the molten tube emerges from the die. An air... 

In the blown sheet extrusion process, after leaving the extmder, gear pump and screen pack, the resin moves to a circular spiral mandrel die in which a tube of molten material is formed and inflated with air from the inside. The tube is then lifted in a haul-off tower up to 40 m high where it is cooled by an internal and external flow of cool air. It then proceeds to... 

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