AS - Graphics - Rotational Moulding

This document covers rotational moulding

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AS-Level ­ Graphics ­ Rotational
Moulding
Rotational Moulding is also known as `rotomoulding' is basically used for the
creation of hollow materials.
The way rational moulding works is that the hollow mould is filled with a charge of
material then slowly rotated causing the softened plastic to disperse around the
walls of the mould.
To increase the thickness of the plastic throughout, the mould will continue to rotate
at all times during the creation to avoid deformation during the cooling stage as well.
The equipment used range in size. The main parts of a Rotational Moulding machine are:
- Oven
- Cooling Chamber
- Mould Spindles
The mould parts are usually created out of aluminium and the finish is usually related to the quality of the
mould itself.
The oven is used to hat the part while it's being rotated then the cooling chamber is used for the product to
set and the spindles are used to make sure that there is an equal cover of plastic in the mould.
Rock and roll machines are a single arm machine. It rotates the mould 360 degrees in one direction and tips
and rocs the mould at 45 degrees above and sometimes below horizontal in the other direction. These
machines are best used for large parts.
Clamshell machines is an single arm rotation machine. This arm is usually reported by other amrs on both
ends. This machine heats and cools the plastic in the same chamber. More than one mould can be attached to
one arm.
Made By Richard Francis - http://getrevising.co.uk/members/richard_francis1

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Up and Over rotational machine between the heating and cooling areas. These machines can vary in size
from small to medium and these machines take up much less space than multi-arm machines.
Shuttle machine is the most commonly used machine in the industry. It has up to 6 arms and also is available
in a wide range of sizes. The fixed machines have 3 arms. One for heating, one for cooling and one for
loading/unloading.…read more

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Products that can be created from
Rotational Moulding include:
Bins
Footballs
Helmets
Rowing Boats
Advantages:
Rotational mouding offers design advantages over other moulding processes. It requires less tooling and so
that be put into production much sooner. Rotational Moulding is also mostly used for short runs or rush
deliveries.
Limitations:
There can be low pressure process. Meaning it will be hard to get into certain areas of the mould.
Another limitation could be the mould itself.…read more

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