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Styrofoam EPS Pre-expander(Basic)

Styrofoam EPS Pre-expander(Basic)

  • Brief Introduction The purpose of pre-expansion is to p […]


Brief Introduction

The purpose of pre-expansion is to produce expandable polystyrene particles of the desired density. During pre-expansion, the EPS resins are fed to a vessel containing an agitator and controlled steam and air supplies, this vessel is called EPS Pre-expander, or EPS Batch Pre-expander Machine. The diameter of the particles increases while the density of the resin decreases. After exiting from the EPS pre-expander, the expanded beads will flow through a dryer to remove moisture, and then go to aging silo.

Body of EPS Batch Pre-expander

• Expansion chamber is made of SUS 304 stainless steel, cylindrical shape with insulation layer. 
• Agitator is made of SUS 304 stainless steel, rotation speed is fixed
• Discharge door located on the side of the vessel, to empty the chamber fast. 
• Safety fence to top.

Screw Loading system

A screw loading machine with a tank ( approx. 1.5 m3 volume , 1200kg EPS beads) is using to load EPS resin to Dosing unit. And then filling to the expansion chamber by gravity. 

Fluid bed dryer

Inside floor parts made of aluminium with slots, The dryer is equipped with a steam-air heat exchanger inside, which avoid the beads from thermal shock. At the end of dryer, there is a Venturi tube system to send EPS beads to specified silos. 

2nd Expansion Unit

2nd expansion system is available for this EPS pre-expander to get lower density. The PLC control the 2nd expansion in a fixed volume. The filling from the silo to the machine is done by a vacuum fan.  

Control Panel

Main cabinet,with security lock,is equipped with Delta touch screen and PLC.
All parameters and recipes can be added, revised and saved in PLC.

Production capacity

EPS Batch Pre-expander, Model: SPJY1600P

• Chamber diameter: 1600mm,
• Chamber height: 2000mm,
• Tolerance: ±2%
• Output: 1200~1400Kg/h, @ density 15kg/m3

EPS Pre-expander Machine, Model: SPJY1600P

• Chamber diameter: 1600mm,
• Chamber height: 2500mm,
• Tolerance: ±2%
• Output: 1400~1600Kg/h, @ density 15kg/m3


• CE certificate
• Less investment with stable quality
• Multiple safety features.
• Pressure Reduction Valve from Japan is used for steam control
• All procedures are controlled by HMI & PLC, easy operation
• Fluid bed is equipped with heater to shorten aging time
• Second expansion is available for lower density
• Automatic EPS Silo System is available to work with EPS Pre-expander together.

Main parts

• Touch Screen + PLC: Delta/China
• Temperature sensor: Jiamin/China
• Electronics:Schneider/France
• Agitator motor: Guomao/China
• Butterfly valve: ABC valve/Singapore
• Angle valve: ESG/China
• Weight sensor: Keli/China
• Pressure Reduction valve: Yoshitake/Japan
• Pneumatic parts: Airtec/China
• Photo sensor:Autonics/Korea

EPS Automatic silo system

The silos are controlled by PLC & Touch Screen, level sensors and pneumatic valve. Silo body made of square steel pipe and nylon net(anti-statics); Galvanized pipe used for EPS transportation, each silo equipped with one inlet pipe (DN200 or 250) and one outlet pipe (DN200 or 250).

While one silo is full during feeding, the system would stop feed this silo and automatically switch to feed another silo. While one silo is empty during discharge, the system would stop suck this silo and automatically switch to suck another silo.

It works with EPS Pre-expander to increase plant automation & keeps the plant clean.

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