Blow Moulding (thermoplastics)

Question 1

Describe the 5 step process of blow moulding briefly

Answer 1

1. Thermoplastic is extruded through a die opening to form a hollow closed tube called a parison.
2. The two sides of the split mould are closed around the parison.
3. Air is blown in to the parison through the shape of the mould.
4. The parison inflates to takes the shape of the mould.
5. The split mould is opened to eject the product.

Question 2

What is blow moulding used to produce?

Answer 2

Hollow products with thin walls such as plastic bottles, containers, tubs, fuel tanks

Question 3

Define blow moulding

Answer 3

Blow moulding inflates a tube of a plastic inside a mould to make hollow shapes such as bottles