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Two stage stretch blow moulding is also known as _________ method.

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Two stage stretch blow moulding is also known as _________ method.

(a) Extrusion

(b) Reheat and blow method

(c) Thermoforming

(d) Injection

This question was addressed to me in examination.

I need to ask this question from Blow Molding in Thermoplastics in chapter Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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Correct choice is (b) Reheat and blow method

To elaborate: Two stage stretch blow moulding is also known as reheat and blow method method. In this, the parisons are first injection molded in a completely separate stage and stored at ambient temperature until required. Then, they are are then reheated to between 90°C and 110°C and blown to their final shape.

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