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:
[ Ссылка ]
A four-minute video of extrusion:
[ Ссылка ]
The link below, is to information and a worksheet about the extrusion:
[ Ссылка ]
If you find the information and worksheets useful, consider joining the World Association of Technology Teachers, the only international Design and Technology Association, with both Full Members and Advisor Members, ready to give advice (free to join):
[ Ссылка ]
New – join us on Facebook at: [ Ссылка ]
![](https://s2.save4k.ru/pic/k7lb-w7o06s/mqdefault.jpg)