Plastic extrusion

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PROCESS In extrusion process, molten material passes through a die that forms a continuous straight profile which is cooled and solidified. Usually, this process is cost-effective for simple profiles and for high volume of production. The principal advantage of this process is that is possible create long length parts. Another one is that is possible manufacture pipes with integrated coupler including rubber seal. On the downside say that the plastic does not dissipate heat as well as metals so water baths or cooling rolls are required to achieve a correct cooling rate. The more common polymers extrusion processes are: Blown film extrusion: This process combines extrusion and blowing to produce a tube of thin film. It begins with extrusion of tube that is drawn upward with rollers and simultaneously expanded by air inflated into through a die mandrel. Plastic film for shopping bags and continuous sheeting are manufacturing by this process.