Vacuum Preexpander
stable, fast, efficient

The hetech preex vacuum enables precise EPS pre-expansion with improved stabilization and reduced storage times. By integrating a vacuum system into the pre-expansion process, it ensures improved bead stabilization, consistent densities, and reduced storage times.

The system is particularly suited for applications where high material quality and process stability are essential.

The preex vacuum system enhances the conventional pre-expansion process by applying vacuum during and after expansion.

• raw material is expanded using controlled steam input
• the vacuum system supports rapid pressure reduction
• this leads to improved drying and stabilization of the beads
• reduced residual moisture enables shorter aging and storage times

As a result, the material reaches a processable state faster, while maintaining consistent quality.

• Process type: steam-based pre-expansion with vacuum support
• Density control: precise and repeatable
• Stabilization time: reduced due to vacuum process
• Moisture reduction: improved drying performance
• Pentane handling: minimized collection points

• EPS packaging applications
• insulation materials
• applications requiring fast material availability
• production environments focused on high throughput and efficiency

• shorter storage due to faster stabilization
• more consistent densities with minimal tolerance
• improved mechanical properties of the material
• reduced moisture content after expansion
• minimized pentane collection points, improving process handling
• overall higher process stability and efficiencyImproved material properties