EPS Batch Pre-Expander Machine

An EPS Batch Pre-Expander Machine is a specialized piece of equipment used in
the manufacturing process of expanded polystyrene foam products, particularly
in the context of the Lost Foam casting technique. EPS Batch Pre-Expander
Machine adopts the most advanced PLC technology, and the pre-heating beads are
uniform. It is composed of automatic electronic weighing (optional) or
quantitative feeding system, pressurized foaming barrel of foaming machine,
computer control system, discharging system and fluidized buffer bed. The
EPS Batch Pre-Expander Machine can be turned on with one key, automatic
feeding, fool-like operation, unattended.
 EPS Batch Pre-Expander Machine Structure
　　1. Pre-launch machine host
　　2. Electromagnetic heating system
　　3. Fluidized bed
　　4. Automatic quantitative system (optional automatic weighing system)
　　5. Feeding system (fan*3)
Lost Foam White Zone Equipment Main functions and advantages
One-key start, fully automatic operation, universal for EPS and STMMA
(copolymer). The pre-expanded beads have uniform size, low moisture content, no
dead particles, and basically no agglomeration. It is easy to install and
occupies a small area.
Fully automatic control: realizes the parameterized control of a series of
steps such as automatic feeding, automatic weighing, pre-loading, automatic
unloading, etc., and automatic operation, and the manual operation program is
reserved in the system, which is convenient for small batch trial production
and maintenance. Humanized settings, flexible and convenient conversion of the
two operation methods.
Pre-foaming Process:
In the process of manufacturing Expanded Polystyrene (EPS), the raw material in
the form of granules is transported to a pre-expander. Inside the pre-expander,
the granules are exposed to wet steam, which heats them up. The heat from the
steam softens the polystyrene beads and triggers the blowing agent that was
dissolved in them. As a result, the blowing agent evaporates, causing the
softened beads to expand.
The density of the final EPS product can be adjusted based on two factors: the
weight of the raw material used and the volume of foam created during the
expansion process. Once the EPS beads have been pre-expanded, they are then
cooled and stabilized in a fluidized bed, which is supported by an air cushion.
After this step, the pre-expanded beads are transferred using a blower and a
rotary feeder into the silos for further processing.
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