The pre-expander machine typically consists of a hopper, a steam chamber, an expansion chamber, a control system, and a discharge system. Here's a general overview of how the machine works:
Loading: EPS beads are loaded into the hopper of the pre-expander machine.
Pre-expansion: The beads are fed into the steam chamber, where they are exposed to steam. The steam causes the beads to expand as the heat softens the polystyrene and the pentane gas inside the beads vaporizes, creating a cellular structure within the material. This initial expansion process is called pre-expansion.




