Features of EPS pre-expanders

EPS pre-expanders have many unique features in the foaming production process, which will be introduced from different aspects below:

1. Automation and control
1. Use of advanced control system
- Many EPS pre-expanders use PLC programmable controllers and touch screens. For example, TD foam pre-expanders, this control system can achieve automatic feeding, automatic temperature control, quantitative pressurized feeding, and achieve the goal of fully automatic production. It makes the entire production process more accurate and efficient, reduces the errors that may be caused by manual operation, and improves the stability of production and the consistency of product quality.
- Like EPS high-precision pre-expanders, the weighing part uses a special weighing controller and load cell. The touch screen and PLC control can accurately control the amount of raw material input to minimize the deviation (±0.05kg), and the material level control uses a vibration foaming induction controller imported from South Korea, which can correctly sense the rise of the foaming particles and maintain the foaming specific gravity deviation to the minimum value (18-25g deviation value is ±1%).
2. Fault detection and response mechanism
- The touch screen control system of the EPS high-precision pre-expander can automatically detect faults and issue an alarm, informing the location of the fault and the repair method, making maintenance easier and faster. When the machine stops suddenly during operation (such as power outage or serious mechanical problems), the steam valve will automatically close immediately, and air will be automatically supplied to the material furnace to prevent the material from caking in the material furnace, providing double protection for the quality of the product.

2. Foaming quality
1. Accurate temperature control
- The TD foam pre-expander adopts high-precision imported air-controlled valve control components, which can control the temperature within ±1%, so that the EPS beads are consistent and the moisture content is extremely low. The pre-expander tank of the EPS high-precision pre-expander is equipped with a temperature control device, which can control the temperature change of the material furnace to a minimum, achieving the effect of saving heat energy. This helps to ensure the stability of the foaming process and make the quality of the foamed beads uniform.
2. Foaming density uniformity
- The correct feeding method of the TD foam pre-expander can make the density of the foamed beads very uniform. The heating base plate of the EPS high-precision pre-expander is made of high-quality stainless steel and uses precision laser cutting. The steam penetration during heating is smoother and more uniform, making the foaming density more stable and the particles more uniform. The steam system of Fangyuan Plastic Machinery's fully automatic EPS polystyrene foam intermittent pre-expander adopts a pressure reducing valve and a PID proportional control steam valve to achieve precise heating and foaming, which helps to improve the uniformity of the foaming density.

III. Production efficiency and stability
1. Efficient production
- The TD foam pre-expander has a relatively high production efficiency, stable operation and high performance ratio. Its continuous pre-expander has a more reasonable structure, and the machine automatically completes the feeding, screening, crushing, conveying and maturation bins. EPS intermittent pre-expanders such as Yujiang brand have a production capacity of up to 400 (kg/h), and Fangyuan Plastic Machinery's intermittent pre-expander has a production capacity of 85-220 (kg/h), which can meet the production needs of different scales.
2. Stable operation
- Many EPS pre-expanders have carefully selected parts and reasonable machine structures. For example, the carefully selected parts and reasonable machine structure of the TD foam pre-expander make the operation very reliable, more efficient and less maintenance. Fangyuan Plastic Machinery's pre-expanders have a one-year warranty for the whole machine to ensure the stable operation of the equipment.

IV. Equipment structure
1. High-quality materials and structures
- The inside and outside of the TD foam pre-expander barrel are made of stainless steel, and the interlayer has insulation measures. It has reliable performance, stable quality, high production efficiency and low energy consumption. The barrel of the continuous pre-expander is made of excellent stainless steel plate with a tight structure to avoid bead contamination caused by rust. The heating base of the EPS high-precision pre-expander is made of high-quality stainless steel and uses precision laser cutting. Fangyuan Plastic Machinery's fully automatic EPS polystyrene foam intermittent pre-expander foaming machine includes a stainless steel drying bed, a spiral feeder, feeding, screening and other devices. These high-quality materials and reasonable structural design contribute to the long-term stable operation of the equipment and the guarantee of product quality.
2. A variety of structural forms are available
- The continuous pre-expander of the TD foam pre-expander has a primary and secondary structural form, which is very convenient to use. You can choose different feeding forms to achieve the ideal foaming density. It can also be customized according to user needs with a heightened type and a fully automatic feeding device.