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Pre-expanders

The pre-expanders are automatic machines for expanding polystyrene beads.

Batch pre-expanders. Polystyrene expansion is performed in batches, to ensure more homogeneous density. The cycle can be repeated by means of the automatic density control system. Densities between 60g/l and 12g/l can be achieved with this type of pre-expanders in the first expansion. They can be fitted with a second expansion unit to achieve 10g/l.

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Continuous pre-expanders. In these machines, polystyrene expansion is performed with a continuous cycle. Densities between 30g/l and 15g/l can be achieved with this type of pre-expanders in the first expansion.

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Horizontal Expanders. In these machines, polystyrene expansion is performed with a continuous cycle. These are used to achieve light density (8÷10 gr/l) in the second or third expansion.

Documents: catalog.