Hangzhou Epsole Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of pre-expander eps auto machine in China. We warmly welcome you to buy high quality pre-expander eps auto machine for sale here from our factory. Good service and reasonable price are available.
EPS Automatic Batch Pre-expander – Precision Batch Foaming for Consistent, High-Quality EPS Beads
The EPS automatic batch pre-expander is a fully automatic industrial machine that transforms raw expandable polystyrene (EPS) beads into uniformly pre-expanded beads at precise target densities through controlled steam heating in an enclosed chamber. Unlike continuous pre‑expanders, this intermittent (batch) system offers batch‑to‑batch density precision (±1%), broader density flexibility (7–35g/L primary), and secondary expansion capability for ultra‑low density applications (4.5–11g/L). Its fully enclosed design ensures 50% less steam consumption, directly reducing operating costs. The pre‑expanded beads are then aged in silos before being molded into final products-making this machine the foundation of any quality‑focused EPS production line.
| Technical Parameters | Epsole EPS Batch Pre-expander Specifications | Industry Reference Level (Batch / Continuous) |
|---|---|---|
| Foaming Density Range (First Foaming) | 7–35 g/L(7–35 kg/m³) | Intermittent: 8–40 kg/m³ Continuous: 12–17 kg/m³ (Lower Limit) |
| Foaming Density Range (Secondary Foaming) | 4.5–11 g/L(Exclusive Capacity Expansion) | Batch: 4.5–11 kg/m³; Continuous: Not supported. |
| Density Tolerance Control | ≤±1%(Electronic Weighing + Level Sensor Dual Closed-Loop System) | Intermittent: ≤ ±2–3% Continuous: ±3–5% |
| Foaming Tank Body Material | 304 Stainless Steel + High-Efficiency Insulation Layer | Standard Carbon Steel or Stainless Steel |
| Weighing Control Accuracy | ±0.05 kg(High-Precision Weighing Controller + Load Cell) | Intermittent: ±0.1–0.2 kg |
| Temperature/Pressure Control Accuracy | PID closed-loop control; pressure fluctuation: ±0.02 MPa; temperature control: ≤±1°C. | Intermittent ±2–3°C |
| Specific Steam Consumption | Compared to continuous systems, it achieves energy savings of over 50% (featuring a fully sealed, constant-pressure foaming tank plus a high-efficiency insulation layer). | Continuous-mode energy consumption is more than 50% higher than that of intermittent mode. |
| Steam Consumption per Cycle | 8-12 kg/cycle(Ф1400-1660) | Batch-type: 8–15 kg/cycle |
| Capacity (approx. 12 g/L) | 300–600 kg/h | Batch-type: 200–500 kg/h |
| Control Architecture | Siemens / Mitsubishi PLC + 10-inch HMI Touchscreen | Domestic-brand or unbranded PLCs |
| Drying System | Standard Fluidized Bed Dryer (Drying + Screening + Crushing + Conveying) | Natural Ventilation or External Dryer |
| Fluidized Bed Dryer Power Consumption | Approximately 7.5 kW | 5–11 kW |
| Compressed Air Consumption | 0.5–1.0 m³/cycle | 0.8–1.5 m³/cycle |
| Secondary Foaming Expansion Capability | Standard Configuration Support | Non-standard or Unsupported |
| Compliance Certification | ISO 9001:2015 + CE | Depends on the supplier |
Technical Principles
Automatic Weighing & Feeding
High-precision electronic weighing system measures raw EPS beads and feeds them into the fully enclosed expansion chamber via screw feeding apparatus.
01
Steam Heating & Expansion
Wet steam is introduced into the rotating chamber, softening the beads and activating the blowing agent.PID steam and compressed air control maintains precise steam temperatures for different density requirements.
02
Constant Temperature & Pressure Holding
The fully enclosed barrel with high‑efficiency insulation maintains stable internal conditions, ensuring beads expand uniformly.
03
Vacuum Drying & Cooling
After expansion, the vacuum system rapidly removes surface moisture (final moisture ≤2%), reducing aging time.
04
Automatic Discharge & Fluidized Bed Drying
Expanded beads are automatically discharged to the fluidized bed dryer, which simultaneously performs drying, screening, crushing, and conveying to curing silos.
05
why choose us
Our products have been exported to over 30 countries and regions, with a cumulative delivery of more than 100 complete EPS production lines.
The entire production line features standardized equipment interfaces and synchronized process data, significantly reducing the coordination costs associated with managing multiple suppliers.
We provide on-site installation, commissioning, and operational training services overseas; our equipment complies with ISO 9001:2015 standards and EU CE directives.
We provide complete export customs clearance documentation, offer flexible trade terms, and accept payment via TT or Sight L/C.
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