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Article | REF: AM3646 V1

Extrusion blow-molding of large hollow plastic bodies

Author: Serge Dupont

Publication date: April 10, 2013

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4. Parison forming

4.1 Continuous & batch extrusion

Fed by the extruder(s), the extrusion head channels transform a cylindrical flow of material into an annular flow which, after passing through a die, forms an envelope called the parison, the blank of the blown body. The diameter and thickness of the parison are determined by the dimensions of the punch/die tooling (see § 4.4).

For large hollow bodies, there are two types of extrusion head.

  1. Accumulation heads (figure 10 ): during the blowing cycle, material is progressively accumulated in a chamber (figure

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