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Examination Question

Injection / Blow Moulding

V. Ryan © 2005 - 2009

 

The manufacture of a plastic bottle is shown below. Each stage is described in detail. Study each stage and then attempt the question paper. (PDF FILE - CLICK HERE FOR QUESTION PAPER)

     

 

1. Granules of plastic powder (polystyrene, nylon, polypropylene and polythene) are poured or fed into a hopper which stores it until it is needed.

 

2. The heater is turned on. This warms up and melts the granular plastic. A motor turns a screw thread which pushes the granules along the heater section causing it to change to a liquid.

     

 

3. The liquid plastic is forced into a mould by pressure.

 

4. Pressurised air is ‘blown’ into the mould. This forces the liquid plastic against the sides of the mould. In this example it forms the shape of a plastic bottle.

     

   

5. The plastic is allowed to cool and the mould is ‘split’ and the plastic bottle removed. The entire process is repeated hundreds or thousands of times.

   
     

 

     

2a. Forming Plastics through Blow / Injection Moulding - Flow Chart

Complete the following flow chart or draw a new version.

 
PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET
 

    Click here for specimen answer to flow chart question.
     
 
     
3a. Explain why recycling is important
3b. Draw a suitable recycling logo.

Click here for sample answer to recycling questions.

     
     

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