Lecture 3 Flashcards
1
Q
thermoforming
A
- clamp sheet and heat to sag point
- force against mould surface using air
- cool and remove
2
Q
thermoforming - thermosets or thermoplastics
A
thermoplastics
3
Q
types of thermoforming
A
- vacuum forming
- pressure forming
- matched moulds forming
4
Q
vacuum forming
A
- sheet heated
- vacuum forces sheet into mould
5
Q
vacuum forming advantages
A
cheap, long lasting
6
Q
vacuum forming disadvantages
A
only simple shapes
7
Q
pressure forming
A
same as vacuum forming but with pressure
8
Q
matches moulds forming
A
similar to metal stamping
heated sheet formed between male and female mould
9
Q
casting polymers
A
polymer precursors place into mould and set at room temperature
10
Q
thermoplastic casting
A
- part formed after polymerisation
11
Q
thermoset casting
A
part formed after chemical reactions polymerise the materials
