EPS Pre-Expander Pre-Expander
Economic advantages all along the line
Advantages of Kurtz EPS Pre-ExpandersEPS Pre-Expander
Even density distribution
Homogeneous temperature distribution in the pre-expanding boiler
Stabilization of EPS-beads in the fluid bed
High material throughput
Low energy consumption
Pre-foaming process: first step to successEPS Pre-Expander
The EPS raw material is conveyed as granules to the pre-expander, where it is heated by means of wet steam. The hot steam softens the polystyrene beads and activates the blowing agent dissolved in them. This evaporates and causes the softened beads to expand. The bulk density can be adjusted by the weight of the raw material and the foamed volume. The EPS beads pre-expanded are then cooled and stabilized in a fluidized bed on an air cushion before being conveyed by blower via a rotary feeder into the silos.
Welding of the end products
During the subsequent intermediate storage, the blowing gas diffuses out of the pre-expanded polystyrene beads and air penetrates. This "packed air" is further processed on an automatic molding machine. To achieve low bulk densities, EPS can also be post-foamed in a second pass.
For expandable polypropylene (EPP), EPP/HP pre-expanders are available for lightweight foaming. This can significantly reduce logistics costs.
Technical DataEPS Pre-Expander
Prozess Optimisation
Density control
Electrical temperature control for high densities
Cellular wheel sluice for material transport to the silo
Options
After foaming facility for low densities
Overfill safety for fluid bed
Wedge wire sieve for big pre-expanders
Data memory
Automatic silo control
Applications
All EPS raw material
Copolymers with EPS percentage
