Injection blow moulding is used for manufacturing large quantities of hollow parts, e.g. bottles, jars and other containers. There are three stages to the process – injection, blowing and ejection.
Injection – First a perform needs to be made. Molten plastic is injected into a hollow, pre-heated mould which forms the external shape. This is clamped around a mandrel (core rod) which forms the internal shape. This perform is produced with a fully formed neck of the bottle or jar.
Blowing – The mould opens and the core rod is clamped into a chilled blow mould. The core rod opens allowing compressed air into the perform inflating it to the finished shape.
Ejection – Once cooled the mould opens and the finished item is stripped off the core rod. As with injection moulding, the perform and blow moulds can have multiple cavities.
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