Inside EPS raw beads, there’s the blowing gas called pentane. After steaming, pentane starts to expand so the bead size also grows bigger, this is called expanding. EPS raw beads cannot be used to make blocks or packaging products directly, all beads need to be expanded first then make other products. Product density is decided during Preexpanding, so density control is done in Preexpander.

EPS Batch Pre-expander is functioned to expand EPS raw material to required density. Material filling and expanding is done batch by batch, so it’s called Batch pre-expander. EPS Batch Pre-expander is a type of full automatic EPS machine, all steps are working automatically like EPS material filling, weighing, material conveying, steaming, stablizing, discharging, drying and expanded material conveying.  

Comparing with Continuous Preexpander, EPS Batch Preexpander can give more accurate density, easier operation, and more energy saving.

EPS Batch Pre-expander completes with Screw Conveyor, Weighing System, Vacuum Conveyor, Expansion Chamber, and Fluidized bed Drier