Rotational Moulding (Leaving Cert Engineering): Flashcards
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Rotational moulding definition
Rotational moulding definition
Process to create hollow plastic products without pressure
Key feature of rotational moulding
Key feature of rotational moulding
Pressure-free process
No. of stages in rotational moulding
No. of stages in rotational moulding
Four distinct stages
Stage 1 of rotational moulding
Stage 1 of rotational moulding
Charging - plastic powder loaded into mould
How many axes in heating rotation?
How many axes in heating rotation?
Two axes
Cooling methods in Stage 3
Cooling methods in Stage 3
Water spray or air cooling
Final stage of rotational moulding
Final stage of rotational moulding
Demolding - mould opened, product removed
% of rotomoulded products using polyethylene
% of rotomoulded products using polyethylene
97%
Main reason PE used in rotomoulding
Main reason PE used in rotomoulding
Melts easily at low temps & available as powder
Reason for low tooling costs
Reason for low tooling costs
No pressure used, so cheaper moulds possible
Wall thickness in rotomoulded products
Wall thickness in rotomoulded products
Uniform throughout due to rotation
Max capacity of water tanks by rotomoulding
Max capacity of water tanks by rotomoulding
Up to 50,000 litres
Marine products made by rotomoulding
Marine products made by rotomoulding
Kayaks, canoes, buoys, pontoons
Automotive rotomoulded products
Automotive rotomoulded products
Fuel tanks for cars and trucks
Purpose of dual-axis rotation
Purpose of dual-axis rotation
Achieve uniform wall thickness