Hangzhou Epsole Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of eps styrofoam pre expander in China. We warmly welcome you to buy high quality eps styrofoam pre expander for sale here from our factory. Good service and reasonable price are available.
EPS Batch Pre-expander Machine – Density Tolerance ≤±2.5%, 50% Energy Saving, CE Certified
The EPS automatic batch pre-expander is the first and most critical machine in any EPS production line. It transforms expandable polystyrene (EPS) beads into uniformly expanded foam beads at precise target densities through a fully enclosed steam expansion process. Unlike continuous pre-expanders that operate with constant material flow, batch pre-expanders process discrete batches using an electronic weighing system that precisely controls the amount of raw material for each cycle. This per-batch weighing capability delivers superior density consistency, making it the preferred choice for wholesalers and manufacturers who require tight density control for downstream molding and cutting processes.
At Epsole, our batch pre-expanders are engineered with a fully enclosed constant-pressure foaming barrel, 304 stainless steel construction, PLC+HMI automatic control, and an integrated fluidized bed dryer for automated post-expansion processing. The machine supports primary expansion from 8–40 kg/m³ and secondary expansion down to 4.5 kg/m³, enabling production of ultra-lightweight beads for Geofoam and specialty applications.
| Parameter | Epsole Machine | Industry Benchmark | Customer Value |
|---|---|---|---|
| Primary Expansion Density Range | 8–40 kg/m³ | 8–30 kg/m³ | Covers packaging, insulation, and high-density applications |
| Secondary Expansion Density Range | 4.5–11 kg/m³ | Typically lacks secondary foaming | Ultra-low density for Geofoam and lightweight fill applications |
| Density Tolerance | ≤±2.5% (±0.3kg/m³ accuracy) | ±3–5% | Superior batch-to-batch consistency; reduces downstream scrap rate |
| Energy Saving | 50%+ vs. continuous pre-expanders | - | Significant reduction in steam operating costs |
| Steam Consumption | 25–40 kg steam per 100kg EPS | Industry average: 50–60kg | Lower operating costs; faster ROI |
| Barrel Material | 304 stainless steel (inner + outer) | Carbon steel or single-layer stainless | Corrosion-resistant; contamination-free; hygienic |
| Control System | PLC + 10″ HMI touchscreen | Manual or basic control | Fully automatic; recipe storage; one-touch changeover |
| Weighing Accuracy | ±0.05 kg controlled deviation | ±0.1–0.2 kg | Precise per-batch weighing; consistent density |
| Level Control | Vibration-type foam induction controller | Photoelectric or basic sensors | Accurate detection of foam particles; density deviation control at ±1% |
| Fluidized Bed Dryer | Integrated drying, screening, crushing & conveying | Natural ventilation only | Automated post-processing; reduces manual labor |
| Certifications | CE + ISO 9001:2015 | Varies by supplier | Hassle-free customs clearance; global compliance |
Core Advantages
Precision Density Control
The vibration-type foam induction controller accurately detects the rising degree of foam particles, making the pre-expanded bead density more uniform.
Fully Enclosed Constant
The closed constant-pressure design ensures foaming pressure remains constant, significantly increasing thermal efficiency.
Secondary Expansion
With secondary expansion, the machine can produce ultra-lightweight beads for Geofoam cement aggregate blends, and specialty lightweight applications.
Fluidized Bed Dryer
The machine is equipped with a fluidized bed dryer that automatically completes drying, screening, crushing, and conveying of expanded beads to aging silos.
PLC + HMI Automatic Control
The operator can set feeding weight and other relevant parameters according to different materials and their different densities, and the settings can freely.
Branded Core Components
This eliminates rust and contamination common with carbon steel barrels, and is suitable for food-contact packaging and cold-chain logistics applications.
why choose us
Quality Assurance
ISO 9001:2015 certified CE certified – compliant with EU Machinery Directive
Fast Logistics
Factory located in Hangzhou, just 2 hours from Shanghai Port
After-Sales Support
On-site installation & commissioning Operation & maintenance training
Flexible Payment
TT, L/C at sight. Trade terms: EXW, FOB Shanghai, CIF.
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