What combination of processes does injection blow moulding involve?

Injection blow moulding is a two-stage process that combines two distinct manufacturing methods: injection moulding and blow moulding. In the first stage, raw plastic material is injected into a mould to form a preform. This preform is then transferred to a blow moulding stage, where air is introduced to expand the preform into the final shape of the container. This combination allows for the efficient production of hollow plastic parts, such as bottles, with high precision and uniform wall thickness.

The other processes listed do not accurately describe the combination involved in injection blow moulding. A single-phase moulding process would not allow for the complex shapes and efficiencies required for items such as bottles. Extrusion followed by injection is a different technique altogether that does not align with the blow moulding aspects. Lastly, blow moulding alone would not encompass the initial injection phase necessary for creating the preform in this specific context. Thus, the choice of injection moulding followed by blow moulding correctly captures the essence of the injection blow moulding process.