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