Extrusion

Question 1

What is extrusion?

Answer 1

Extrusion is used to create objects of a fixed cross section. A material is pushed through a die of the desired cross section. It can be done when the material is hot or cold

Question 2

What materials are extruded?

Answer 2

Metals, plastics, ceramics, concrete and play dough are extruded.

Question 3

What is the process of extrusion?

Answer 3

The material is heated and loaded into the container in the press. A dummy block is then placed behind it where the ram then presses on the material to push it out of the die.

Question 4

What are the advantages of extrusion?

Answer 4

It is low cost compared to their moulding processes. It mainly uses thermoplastics which can melt and harden. Left over material can be reused which means there is no wastage.

Question 5

What are the disadvantages?

Answer 5

It can be a problem guessing the expansion of the plastic and eliminates this method for precision parts manufacturing . Also there is a limit on what kind of products that can be manufactured.

Question 6

What is the difference between extrusion and injection moulding?

Answer 6

Extrusion is a method in which molten plastic or any other material is pushed through two dimensional die openings. Where as injection moulding is based on the molten die casting method