BLOW MOULDING

BLOW MOULDING

Process:-

Blow moulding is a process of forming hollow articles from a soften plastic tube. The process consists of forming a tube of the melt (called parison) and introducing air into the parison to expand, either to a free blown object or against a mould to form it to a definite size and shape.

The equipment used to accomplish this job often consists of an extruder to plasticize the resin; a cross head with die and core to create desired tube or parison, an air source to inflate the tube, and a press to open and close the mould.

Theoretically any thermo plastic resin can be used for a blow moulding operation. However, only those materials which show high hot strength and good stretch properties at the extrusion temperature and suitable for formation of a parison and a subsequent blowing can be used. In all cases the extruder should have an L/D ratio of at least 20: 1 to ensure complete and thorough plasticization of the melt.

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