Moulding Flashcards
Within plastics, which type is usually moulded?
- CT
Thermoplastics
What are the disadvantages of rotational moulding?
- CT
It is labour intensive and requires longer per part than any other method.
What material is used for the method of extrusion?
- CT
Plastic granules
Where do you place the plastic granules in an extrusion method?
- CT
In the hopper.
What mould is used for extrusion blow moulding?
- CT
A two part mould
What type of plastics are almost always used for moulding?
-HB
Thermoplastics.
What are three checks that need to be made for the mold before vacuum forming?
-HB
No undercuts or negative draft angles which
would prevent the mould being removed.
Radiuses where possible to allow easy release of
the mould.
A high quality surface finish on the mould to
transfer onto the plastic.
What is the specific name of the screw used in extrusion?
-HB
Archimedes screw.
Why is injection moulding suited for mass production?
-HB
It is an expensive process that uses specifically designed molds.
What type of manufacturing process is moulding?
-HB
Deformation/Reformation
i think
What are the two types of blow moulding? -FW.
Injection and Extrusion.
What is a sprue? -FW.
A little lump left by injection moulding.
What does extrusion force the plastic through? -FW.
A die.
What kind of screw does extrusion use? -FW.
An Archimedes’ Screw.
What part does injection moulding require, but not extrusion? -FW.
A mould and a Ram.
