Exercise sub unit 5.2 Polymer Processing

Below are types of polymer processing EXCEPT

• Blow molding

• Extrusion

• Slip casting

• Injection molding

In polymer processing, during cooling..

• material soften and melt

• material solidified and retain the shape

• material ejected

• molten metal fill in the mold cavity

In injection molding, function hopper is

• To feed raw material

• To inject molten metal into mold

• To remove the product from mold

• To heat raw material in the barrel

Below are the advantages of injection molding EXCEPT

• Higher production rate

• Close tolerance

• Low cost tooling

• Can produce complex shape

Injection molding suitable for type of raw material

• Thermoplastic only

• Thermosetting only

• Thermoplastic and Thermosetting

• None of the above

In compression molding, pressure applied to force material into contact with mold

• True

• False

Which one is the disadvantages of compression molding

• Low production rate

• Reject part can be processed

• Low setup cost

• Maximize wastage of material

In compression molding, the mold must be heated

• True

• False

Both injection molding and compression molding can produced complex

shape of part

• True

• False

The input/feeder material can be in the form of.............EXCEPT

• Granule

• Powder

• Pallet

• liquid/slip