Processes

Question 1

What is Injection Moulding?

Answer 1

Injection Moulding is the process of injecting molten material under high pressure into a mould or die to achieve a certain form. This process allows a range of complex shapes to be manufactured in high quantities. The quality of the finish means that each piece doesn’t require further finishing

+ Fast Production
+ High Repeatability
+ Precise
+ little to no plastic waste

• High Initial Cost
• Part design and size restrictions

1. Plastic resin is poured into a desired shape
2. The holding pressure is applied to increase density of the plastic.
3. The plastic is then cooled and solidified
4. The plastic is carefully released

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Question 2

What is Extrusion

Answer 2

Extrusion shapes objects with a fixed cross-section by pushing material through a die. Its used to make complex shapes that re consistent in length.

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Question 3

What is Laminating

Answer 3

Laminating is to apply a plastic/transparent film to the surface of the material.

This can create a composite material,
improving strength, stability, appearance or other
properties

Example - chipboard worktops with melamine veneer

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Question 4

Spot wielding

Answer 4

Works by placing workpiece between two copper electrodes, current is passed through metals via electrodes causing two sheets to fuse.

+cost effective
+speed,accuracy,reliability
+ welding is localised, rest of material isn’t effected