Unit 5D.2 Flashcards
(19 cards)
What does gauge mean?
Wall-thickness
As gauge increases, wall thickness _____________
decreases
What are plastic films?
Thin form of sheets which can be heated sealed to be airtight.
What does EPS stand for?
Expandedpolystyrene
Characteristics of EPS
- Waterproof
- Thermal insulator
- Shock absorbent
- Light-weight
- Chemically inert
Where is foam used?
- Softening seating
- Mattresses
- Floor coverings
.Thermal insulation
.Noise dampening
How do you connect plastics?
- Adhesives (glue)
- Welding
- Mechanical fixings
Why do you drill a pilot hole?
To prevent splits
Why do you drill a countersunk hole?
So screw head doesn’t stick out
What is a plastic butt hinge?
Standard for openings, can be glued, welded or bolted to a product.
What is a plastic fold hinge?
Extruded projectile holding two sheets of plastics, single centre layer allows flexing.
What is a butterfly hinge?
Decorative version of butt hinge, can be mounted on plastic with countersunk nuts and bolts.
Casting resin
An additive redistribution process
Laminating
Bonding strips or sheets of material together in layers.
What is stereolithography? (SL)
Using lasers to part cure the printed shape from a bath of liquid resin.
Cons of sterolithography
Expensive (but accurate)
Toxic fumes
What is fused deposition modelling?
Melt plastic filament with heat extrusion head.
Shapes built layer by layer
What is chemical welding?
Using solvents to dissolve the surfaces of two pieces of plastics before joining.
What is heat welding?
Involves using a special hot air gun to weld plastics together.
