Pre-expander for expanded polystyrene (EPS)
ALESSIO S.r.l.

Complete line of batch pre-expanders; they can expand all types of EPS material on the market with total control of the cycle. The range starts at 150-litre volume and goes up to a 4000-litre model.

The two largest size models are designed for companies that produce blocks and/or big quantities of low/medium density EPS.
The intermediate sizes are for companies that produce with any density.
These models may be fitted with an optional patented device which ensures a 50% quality increase in density tolerance of the expanded material.

The smallest model is designed for companies that produce safety items; it is complete with a patented system to obtain EPS with controlled and constant density and pearl size; the tolerance to medium/high density is less than 1 g/l.

Alessio also produces continuous pre-expanders and 2nd expansion systems.

All our pre-expanders are equipped with "automatic density control".
Screw-feeder or aspirator feed systems are available.
The silos' transfer system may be by Venturi tube or sector valve.
The layout of the various elements that make up the system may be customized on request.