1. PLASTIC
Plastic and Processes Theory.
Knowledge and Understanding.

2. PLASTIC THERMOPLASTIC THERMOSETTING Recyclable
PLASTICS can be divided into TWO main categories THERMOPLASTIC and THERMOSETTING plastic .
THERMOPLASTIC
Recyclable
Don’t resist heat very well
Easily shaped and reshaped over and over.
Examples: Acrylic, ABS, Polystyrene and Polythene.
THERMOSETTING
Non-recyclable
Resists heat and fire very well
Hard to reshaped.
Examples: Epoxy resin, Urea-formaldehyde, Polyester resin.

3. MATERIALS POLYESTER NYLON
Polyesters (PET) is produced in numerous forms such as sheets and three-dimensional shapes.
thermoplastics may change shape after the application of heat, it is strong, lightweight and waterproof.
USE: home furnishings such as bed sheets, bedspreads, curtains, ropes, fabrics for conveyor belts, safety belts, coated fabrics and cushion padding.
NYLON
Durability: its high tenacity fibbers are used for seatbelts, tire cords, ballistic cloth and other uses.
High elongation, excellent abrasion resistance, highly resilient (nylon fabrics are heat-set)
High resistance to: insects, fungi and animals, molds, mildew, rot, many chemicals and rain

4. Plastic Theory. PLASTIC Thermoset plastic.
1. Plastics are divided into two groups, they are:
Thermoplastic
Thermo set plastic
2. Describe the difference between the two groups:
Thermoset plastics can only be heated and shaped once.
Thermoplastics can be heated and shaped many times .Making them ideal for recycling.
3. What type of plastic would you use for electrical products:
Thermoset plastic.
4. Give a reason for your choice:
Thermoset plastics can only be heated and shaped once making them more resistant to heat and electrical fires.
PLASTIC

5. Plastic Theory. Blow Moulding
5. Name and briefly describe two methods of shaping plastic:
Blow Moulding
FEED BACK
Parison
How are they made?
Blow moulding of plastic bottles.
A molten polymer is extruded into a hollow,
tube-shaped parison.
A split mould is closed around the parison, which is expanded against the sides of the mould by a stream of air.
Once the plastic has solidified, the mould is opened and the shaped bottle released.

6. Plastic Theory. Injection Moulding Polystyrene, nylon,
Materials used:
Polystyrene, nylon,
polypropylene and polythene.
Products made:
Electronic cases, mp3, Wii, etc,
How it works.
Granules of plastic are poured into a hopper.
2. A motor turns a thread which pushes the granules along the heater section which melts then into a liquid.
3. The liquid is forced into a mould where it cools into the shape.
4. The mould then opens and the shape is removed.

7. Plastic Theory. Vacuum Forming How is it works? FEED BACK Mould Facts.
The mould must have sloping side so that it can be easily removed later.
The mould should be greased before use for easy removal later.