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MANUFACTURING TECHNIQUES - HDPE RECYCING BIN

BLOW MOULDING

V. Ryan 2009

 

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THE MANUFACTURE OF A PLASTIC DUST / REFUSE BIN
Blow moulding follows the same stages of manufacture as injection moulding. HDPE (high density polyethylene) is ideal for this typeof manufacturing technology (see diagram below). The HDPE granules / powder is placed into the hopper. It drops down on to a rotating thread and travels along its distance. During this process the granules / powder is heated and becomes fluid.

However, when it reaches the mould compressed air is also blown into the mould. This pushes the HDPE around the edges of the mould, forming a hollow shape, in this case the recycling bin.
 
 
 
 
 
 
When the HDPE is cool it is removed from the mould and excess HDPE is trimmed away - leaving the bin.
 
EXAMINATION QUESTION
 
 
 
 
 
 
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