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PS foams are produced by ________

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in Food Packaging Technology by (63.0k points)
PS foams are produced by ________

(a) injection moulding and extrusion moulding

(b) extrusion moulding only

(c) injection moulding only

(d) stretch blow moulding only

The question was posed to me in an interview for job.

Question is from Blow Molding in Thermoplastics in division Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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Right answer is (a) injection moulding and extrusion moulding

Explanation: Polystyrene foams are produced by Injection moulding and extrusion moulding. With injection molded foam, machines similar to normal injection molding machines are used, except that steam is injected to heat the beads that contain a foaming agent. Extruded PS foam is produced by free expansion of hot PS, blowing agents and additives through the slit orifice of a high L/D ratio extruder to about 40 times the pre-extrusion volume.

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