Plastic: forming Flashcards
1
Q
Deforming -> bending
A
Reforming -> extrusion
2
Q
Line bending
A
- transparent acrylic
- heat the plastic using hot wire or electric fire element
- 2D design
- use strip heater to bend along edges
3
Q
Vacuum forming
A
4
Q
Injection molding
A
Adv.
- high production rates are possible
- good finish & good quality
Dis.
- expensive set up
- tools (the dies/moulds are produced to high accuracy
5
Q
Extrusion blow moulding
A
Adv.
- high production rates
Dis.
- poor quality finish surface
6
Q
Extrusion moulding of a thermoplastic
A
Similar to injection moulding, for simple shapes, poor quality finish
7
Q
Vacuum forming thermoplastic
A
- making simple moulds -> thin sheet of thermoplastic
- high impact polystyrene sheet which is used in school, PVC can be use
- mould created from wood or epoxy resin
- the plastic sheet heated until become soft
8
Q
Compression moulding
A
- how thermosets are formed
- reaction occurs as granules are heated and compressed
- UF and MF are formed
