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EXAMINATION QUESTION - VACUUM FORMING

V. Ryan 2004 - 2009

 

The dish shown opposite has been designed to be made in a type of plastic.

1. Name a suitable plastic for the manufacture of the dish.

NAME:   POLYSTYRENE

 

2. List four properties / qualities of the plastic you have named.
 
A. PROPERTY / QUALITY 1:
Polythene is manufactured in a range of colours.
B. PROPERTY / QUALITY 2:
Polythene is manufactured in a range of thicknesses.

C. PROPERTY / QUALITY 3:

Polythene can be formed under heat and pressure.
D. PROPERTY / QUALITY 4:
Polythene is resistant to corrosion.
   
 
 

3. In the four spaces below draw a diagram to represent the manufacture of the plastic dish. Underneath each diagram add explanatory notes.

   
STAGE ONE

  STAGE TWO

NOTES:  The former (mould) is placed inside the vacuum forming machine and lowered.

 

NOTES:  A polythene sheet is placed above the former and the heater is turned on.

STAGE THREE

  STAGE FOUR

NOTES: The polythene warms up and becomes flexible.

 

NOTES: The former is moved upwards and the air removed from below. Atmospheric pressure presses the polythene on to the mould

 

 

   

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