Compression Moulding

Question 1

What is compression moulding?

Answer 1

Compression moulding is a process in which plastic material is placed into a heated metal mould and is softened by the heat and made into the shape of the mould as it closes

Question 2

What is compression moulding used for?

Answer 2

It is used in manufacturing thermoset plastic parts. The raw materials usually come in the form of granules and are placed in an open heated mould cavity.

Question 3

What is compression moulding suitable for?

Answer 3

It is high volume method suitable for moulding high strength fibreglass reinforcements. It has the ability to mould large parts. It is cheaper than other methods.

Question 4

What are the advantages?

Answer 4

There is a lower cost of tooling as the process does not involve a transfer cycle. Tools can be made of low cost granules of steel to save money. It’s useful for small production runs.

Question 5

What are the disadvantages?

Answer 5

It’s consistency is quite poor and is not suitable for different types of parts. It is better suited to large basic shape productions.

Question 6

What materials are manufactured through compression?

Answer 6

Polyester fibreglass resin systems, vesper, poly and many grades of PEEK

Question 7

What are the six considerations to bear when using compression moulding?

Answer 7

1) proper amount of material.
2) minimum amount of energy required to heat the material
3) minimum time to heat the material
4) the right heating technique
5) the right force to ensure the perfect shape is achieved.
6) the mould has been made for rapid cooling