Automatic EPS Pre-Expander Machine With Precise Density Control
Hangzhou Fuyang Dongshan Plastic Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of automatic eps pre-expander machine with precise density control in China, also supports customized service with low price. Welcome to wholesale high quality automatic eps pre-expander machine with precise density control for sale here from our factory. Contact us for pricelist.
Automatic Continuous Working Type EPS Pre-Expander Polystyrene Foam Maker for Styrofoam products Manufacturing

The Dongshan High Precision EPS Batch Pre-Expander is designed for the accurate and efficient pre-expansion of EPS beads, providing stable density control for the production of EPS insulation boards, packaging materials, ICF blocks, and other high-quality foam products. Combining intelligent automation with advanced density control technology, it ensures consistent bead expansion, high production efficiency, and reduced energy consumption.
The machine features a stainless steel expansion chamber that provides excellent corrosion resistance, stable heat transfer, and long service life. Its intelligent density control system continuously monitors the expansion process and automatically adjusts operating parameters to achieve precise bulk density with minimal deviation, ensuring consistent raw material quality for subsequent molding processes.
The advanced steam recycling system improves steam utilization while reducing energy consumption and operating costs. A Korean vibration measuring rod provides accurate material level detection, while the automatic weighing system ensures each production batch meets the required density specification. The optimized feeding and discharge system delivers stable material flow, minimizes bead damage, and improves overall production efficiency.
Designed for reliability, precision, and long-term performance, the Dongshan High Precision EPS Batch Pre-Expander is an ideal solution for manufacturers seeking high-quality EPS bead expansion, consistent product quality, and lower production costs. It can be seamlessly integrated into complete turnkey EPS production lines for modern, automated foam manufacturing.

Core Component & Performance Matrix
|
System |
Key Component / Brand |
Operational Advantage |
|
Pressure Regulation |
Batton (Germany) / Yoshitake (Japan) |
Constant-pressure stability; ±0.01MPa variance |
|
Thermal Logic |
Dual Proportional Valves |
Precise high-density expansion control |
|
Motion Control |
Frequency-Inverter Spindle |
Adaptive agitation for various material types |
|
Level Sensing |
Korean Vibration Sensors |
Uniform bead density and volume control |

High- Efficiency Flow Design: Large butterfly valve ensures stable vacuum and rapid discharging; DN 150 feeding valve reduces feeding time by 6- 8 seconds; vacuum cooling system with buffer tank improves pre- vacuum efficiency, significantly shortening the overall cycle.
Synchronous Operation: Dual- barrel vacuum feeding system enables simultaneous discharging and feeding, ensuring uninterrupted production.
Uniform Conveying: Four discharge ports for synchronous discharging; multi- port air supply in vacuum system ensures uniform ventilation of particles; wind- shielded feeding device (stainless steel) adapts to heavy materials, offering fast and durable performance.
Insulation & Stirring: Thickened insulation cotton reduces barrel heat loss; stirring spindle with frequency converter supports multi- speed adjustment, ensuring stable processes.

Precision Control & Stability Assurance
Sealing & Regulation: Four sets of discharge cylinders with imported sealing compo nents for long- term reliability; German Burkert proportional valves, pressure sensors, and temperature transmitters precisely control steam and cold air circuits, achieving constant tem perature and pressure foaming, suitable for multi- weight processes.
Air Supply & Temperature Control: Japanese SMC pressure reducing filter and sec ondary pressure stabilization system ensure stable compressed air; feeding fan with steam proportional valve maintains constant air temperature in various environments.
Production Efficiency
Protection System: Pipeline safety valves provide dual protection for steam pressure; stainless steel crushing and screening device intercepts agglomerates to prevent blockages.
Intelligent Functions: Automatic density weighing system displays real- time cycle weight and supports data interfaces; dual- vibration level gauge combined with viewport clean ing system avoids level misjudgment.
Durability & Maintenance: Key components use corrosion- resistant stainless steel; vacuum tank has inspection port, cooling system with imported hoses to reduce vibration and protect pumps.
Technical Specifications
| Number | ltem | Unit | DS1200 | |
| 1 | Expand Chamber | Chamber | mm | φ1200×1470 |
| Effective Volume | m² | 1.35 | ||
| 2 | Steam | Entry | inch | DN50 |
| Pressure | Mpa | 0.5-0.6 | ||
| 3 | Compressed Air | Entry | inch | DN40 |
| Pressure | Mpa | 0.55-0.7 | ||
| 4 | Drainage | Upper Vent | mm | DN150 |
| Down Vent | mm | DN100 | ||
| 5 | Capacity | 12g | KG | 600-800kg/h |
| 18gl | KG | 900-1200kg/h | ||
| 25gl | KG | 1100-1300kgh | ||
| 32gl | KG | 1200-1400kgh | ||
| 6 | Total Power | KW | 31.05 | |
| 7 | Expanding Tolerance | % | ≤±0.5% | |
| 8 | Overall Size(L×W×H) | mm | 2300×2300×6000 | |
| 9 | Weight | KG | 5500 | |
Product Applications
Building Insulation Field
Packaging Industry
Advertising and Decoration Industry
Cold Chain Logistics Field
Other Fields

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