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1.4 Forming, Redistribution & Addition, Blow Moulding - Coggle Diagram
1.4 Forming, Redistribution & Addition
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Polymer Processes
Vacuum Forming
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Products - lightweight trays, box inserts and liners, takeaway coffee cups and yoghurt pots.
moulds are relatively easy to make, but need a draft angle, air holes and rounded corners.
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- Mould is placed on bed of machine-platen-which is lowered to bottom of machine
2.Polymer sheet is clamped over mould and heater is pulled over polymer sheet
- When sheet has softened, platen is raised into polymer and heat is removed
- Vacuum pump is switched on, which sucks polymer onto mould
- Once polymer has cooled and returned to solidified state, platen is lowered and vacuum switched off
- Mould is removed from moulding, excess polymer is trimmed off
Thermoforming
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Products - Bath, food packaging
Like vacuum forming, except an additional mould is pressed onto surface of polymer sheet at the same time vacuum is applied
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slow process, used in industrial production
Calendering
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Industrial production method, carried out by specialist manufactures
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