EXTRUSION OF PLASTICS
This is the fifteenth post from the World Association of Technology Teachers ([ Ссылка ]), on materials and associated industrial processes.

Materials such as polystyrene, nylon, polypropylene and polythene can be used in a process called extrusion. Thermoplastics can be heated and then pressured through a steel die they can be formed into different shapes and sections

A machine used to extrude materials is very similar to the injection moulding machine. A motor turns a thread which feeds granules of plastic through a heater. The granules melt into a liquid which is forced through a die, forming a long 'tube like' shape. The extrusion is then cooled to a solid shape. The shape and section of the die determines the shape and section of the tube.
A one-minute video showing the extrusion process as an animation:
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A four-minute video of extrusion:
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The link below, is to information and a worksheet about the extrusion:
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