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Components
The image on the left shows the
components used in discontinuous production. The foam
application method and the sandwich press
itself also play an essential role in producing sandwich
elements. |
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Closed-mould foaming
The way the raw-material is injected
into the mould is of great significance in terms of the
sandwich elements' quality. The easiest and minimum cost
method is spot-shot injection at the side or end of the mould.
Multi-shot injection however will increase the foam's
quality and the additional use of a drawing technique will also
enhance pre-distribution of the reaction mix liquid.
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Open-mould foaming
Density distribution will be
excellent, if the raw material is dispensed into an open mould.
This method usually makes use of a fan-shaped casting rake that
will distribute the reaction mixture evenly across the entire
element width.
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Moving or stationary casting rake
Two casting rake
arrangements are possible. First, casting
rake plus mixhead are moved across the bottom
facing material in-side the press. Secondly,
the casting rake is fixed at the press'
inlet side and the bottom facing will then
be drawn underneath the rake as it enters
the press. Either one or two mixheads may
be used depending on individual output requirements.
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