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Blow moulding
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One characteristic feature of blow moulding, in contrast to injection moulding, is that hollow parts can be manufactured;
to a limited extent undercuts (see also mouldmaking) can also be produced without slides.
In comparison with injection moulding, variations in the wall
thickness
can only be achieved indirectly; thererfore the achievable tolerances
are greater.
Day-to-day examples of products machined in this way are bottles,
canisters, casks and drums. Their volume can vary between 0.05 and
10,000 litres. However,
technical parts such as air ventilation ducts,
gaiters (e.g. convoluted rubber gaiters for steerings or axes), half-shells
of suitcases, roof-mounted luggage
racks or fuel tanks can also be blow moulded. Larger toys (e.g. ride-on toys) are also often manufactured
using this technique.
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