Moulding Processes

Question 1

EXTRUSION:

Draw and annotate an extrusion machine. What process is this similar to (except for the mould)?

Answer 1

Injection moulding

Question 3

LAYING UP:

First you paint a layer of ________ ______ and then place a layer of ______ __________ on top and _______. Used for ______ _______ production.

Answer 3

1) Polyester resin 2) Glass matting 3) Repeat 4) Small scale

Question 4

COMPRESSION MOULDING:

Draw and label a diagram of a compression moulding machine.

Answer 4

Question 5

CALENDARING:

Draw and label a diagram of plastic being calandered.

Answer 5

Remember that the ‘plastic dough’ can also be referred to as a slug. Also, the rollers can have patterns/grains on them.

Question 6

ROTATIONAL MOULDING:

Draw and label the process of rotational moulding. What type of product is made this way?

Answer 6

Hollow objects can be made like this.

Question 7

COMPRESSION MOULDING:

The main way of moulding _________ plastics. Under _ ______ of pressure.

Answer 7

1) Thermosetting 2) 5 tonnes

Question 7

BLOW MOULDING:

Draw and label the blow moulding process. This is how plastic bottles are made.

Answer 7

Question 8

INJECTION MOULDING:

It can mould _____ plastics. It cannot form ______ objects. The mould must be made from at least _ parts. The mould can also be called _ ___. The plastic is heated to _____.

Answer 8

1) Thermo 2) Hollow 3) Two 4) A die 5) 200*C

Question 9

INJECTION MOULDING:

Draw and label a diagram of the injection moulding process. Remember to include what state the polymer is in at each end of machine.

Answer 9

Question 10

CALENDARING:

The plastic starts this process in the form of a ___. Making plastic into _____ ______ can only be achieved through this process.

Answer 10

1) A slug 2) Thin sheets