Guide · 2 min read

Extrusion, Injection and Stretch Blow Moulding Compared

Three ways to make a plastic bottle.

Extrusion blow moulding

A molten tube is clamped in a mould and inflated. It is versatile, handles handles and large volumes, and suits HDPE and PP.

A preform is injected on a core rod, then blown. It makes small, precise, flash-free containers.

A PET preform is reheated, stretched and blown, orienting the molecules for strength and clarity.

Lasers or inkjet printers code bottles straight after moulding or at the filler.

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