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Description
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Process
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Uses
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Injection Moulding
Molten plastic is injected under high pressure
into a cooled, split mould to produce a high
precision moulding.
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Buckets
Telephones
TV cabinets
Gears
Toys
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Blow Moulding
A hot thermoplastic tube is inflated by
compressed air into a cooled split-cavity mould
to produce a hollow moulding
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Bottles
Drums
Carboys
Car fuel tanks
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Extrusion
Molten thermoplastic is extruded under high
pressure through a shaped die to produce a
continuous precision section.
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Drain pipe
Guttering
Water pipe
Roofing sheet
Window frame
Wire insulation
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Compression
Moulding
Thermosetting plastic powder is compressed and
heated in a matched die-set to produce a
precision moulding
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Fuse boxes
Lamp holders
Saucepan handles
Insulators
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Rotational Moulding
Thermoplastic powder is tumbled, heated and
cooled in a split, hollow mould to produce a
hollow mouding of simple shape
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Litter bins
Play balls
Traffic bollards
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Vacuum Forming
Thermoplastic sheet is heated and forced under
vacuum into contact with a cooled form-mould to
produce a simple shaped moulding
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Yoghurt pots
Vending cups
Fridge linings
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Dip Moulding
Temperature controlled mandrels are dipped
into a bath of plastic paste or fluidised powder
to produce a peelable skin (or durable coating)
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Protective-gloves
Balloons
Handle grips
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Calendering
Hot thermoplastic is passed through a series
of temperature controlled rolls with
progressively smaller gaps to produce a
continuous precision thin sheet (also embossed,
if required)
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Protective sheet
Shower curtains
Flexible film
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GRP Laminating
Layers of glass fibre matt are laid-up and
wetted with a thermosetting resin into a simple
mould to produce a large, strong structural
moulding
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Boats
Car bodies
Chemical plant
Cladding
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Structural Foam
Moulding (PU)
A two-part premix is introduced into a split
cavity mould where it expands to produce a strong,
lightweight moulding
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Computer housings
Casings
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Visit
www.pras.com/pras/materials_and_processes/processes
to see animated versions of some of the above processes. |