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Plastic Forming Tech and Review
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Compression molding heats and presses plastic into a mold. Name one example.
Outer castings
Injection molding introduces melted thermoplastics into the mold. Name one example.
Household containers, toys, certain parts of cars or planes
Blow molding uses air to mold plastic. Name one example.
bottles, toys, hollow objects
Name one use of vacuum forming
ice trays, plastic bathtubs, car dashboards
Name one step of vacuum forming
1. A sheet of thermoplastic material is placed over a mold 2. heated until soft 3. vacuum created for shape 4. sheet cooled and removed
Name one use of calendering
Counter tops and cupboards
What happens in calendering?
Thermoplastic materials are passed through rollers to make thin sheets
Name one use of extrusion
water pipes, insulation of cables, plastic films
Name one step of extrusion
1 Thermal plastic material is added to a machine where they melt and form liquid. 2. the plastic is shaped 3. put in cool water to harden
Name one plastic forming technique
Extrusion, calendering, vacuum forming, molding
Name one elastomer
Natural rubber, synthetic rubber, neoprene
Kitchen countertops, dishes, and food containers are made of what type of plastic?
Melamine
Electrical plugs are made of what type of plastic?
Bakelite
What is an example of polyurethane?
sponges, foam, glue, varnish, transmission belts, frictions wheels, insulators
How many times can thermosetting plastics be heated?
Once
Name an example of hard polystyrene (PS) OR expanded polystyrene (PS)
transparent films, dairy product containers OR Packaging, insulations
Name a property of hard polystyrene (PS) OR expanded polystyrene (PS)
Transparent, can be colored OR Porous, soft
Name an example of PP (Polypropylene)
Bottles, bumpers, household appliances, ropes
Name a property of PP (Polypropylene)
Flexible, resistant to chemicals, hard surface
Name an example of HDPE OR LDPE
Buckets, containers, bottles OR Plastic bags
Name a property of HDPE OR LDPE
rigid, resistant OR Soft, light, transparent
Name an example of PET
Transparent bottles, water, oil, cosmetics
Name a property of PET
Rigid, transparent
Name a property of PVC
strong or waterproof
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