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 A relatively new variant of injection moulding which improves strength.
Unlike injection moulding two injection units is used for injection of plastic.
Whilst one unit is pushing plastic into the mould, the other one is pulling.First the cavity is filled by the first unit, then pressure and new melt plastic is injected from the second unit causing the melt to be in motion while it cools off. The process is then reversed. The advantage is that the molecular structure of the part is very uniform and
that internal weld lines is reduced (with two or more sprues). |
| RELEVANTE VIRKSOMHEDER
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This page was last updated on 29.07.1996, Torben Lenau, Thomas Nissen, DTU.
GENERAL DESCRIPTION