Double Piston Screen Changer

Double Piston Screen Changer: Features two pistons working simultaneously. While one piston is changing the screen, the other remains in the melt flow—allowing screen changes to be performed without stopping the machine or interrupting the melt flow.

Introduction

The double piston screen changer comprises a main body, two pistons (each with 1 or 2 screens), a hydraulic station and other components, forming a complete filtering system. The two pistons operate simultaneously: while one is driven by a hydraulic or mechanical device to change the screen, the other remains in operation. Additionally, its unique material introduction and exhaust design enables screen changes without stopping the machine or interrupting the melt flow. Our double piston screen changers are available in double-screen and four-screen models.

Advantages of Double Piston Screen Changers:

1.Compared with plate screen changers, there is no need to reduce the extruder's working pressure or stop the machine during screen changes.
2.No interruption to melt flow during screen changes: The unique material introduction and exhaust design enables continuous flow during screen replacement.
3.Compared with plate screen changers, its longer flow channel is beneficial for plasticization.
4.User-friendly design: For double piston four-screen models, two screens remain in the melt flow at all times, while the other two are on standby. When a piston switches screens, there is no need to replace the filter immediately, providing more operating time and reducing errors.
5.Efficient filtration: The double piston screen changer can continuously filter impurities in the melt, enhancing efficiency.
6.Strong durability: Made of alloy material with nitriding treatment, it features a robust structure, high temperature resistance, and corrosion resistance, making it suitable for long-term high-load operation.
7.Strong adaptability: Suitable for various plastic, rubber, and polymer processing processes, and capable of handling melts with different viscosities and temperatures.
8.Adopts automated design: Reduces labor costs.
9.Easy maintenance: The modular design facilitates convenient maintenance and part replacement.
10.Energy-saving and environmentally friendly: Reduces waste and energy consumption.

Disadvantages of Double Piston Screen Changers:
Compared with plate screen changers, it requires a higher one-time investment and has a larger volume, demanding more installation space.

Specification:

Model	Screen Size (mm)	Filtration Area (cm2)	Production Capacity (Kg/h)	Heating Power (KW)	Working Pressure (Mpa)
SKB-Z2-120	φ100	157	110-350	7.2	≤25
SKB-Z2-160	φ135	286	300-700	10.4	≤25
SKB-Z2-200	φ155	377	400-1000	12.9	≤25
SKB-Z2-300	R85-45	606	500-1500	21	≤25
SKB-Z2-450	R90-110	904.6	550-1800	28	≤25
SKB-Z2-600	R115-80	1198	550-1800	31	≤25

Application:

The double piston screen changer enables screen changes without stopping the machine, reducing the extruder’s working pressure, or interrupting the melt flow. It can meet the production and filtration needs of most hot-melt materials, particularly in scenarios with high requirements for product quality and stability.
◆ Granulation production lines, suitable for polymer materials such as PP, PE, PET, and PA;
◆ Film production lines, suitable for polymer materials such as PET, CPE, BOPP, PE, and HDPE;
◆ Sheet and plate production lines, suitable for polymer materials such as PP, PE, PET, and ABS;
◆ Packing tape production lines, suitable for polymer materials such as PP and PET;
◆ Pipe production lines
◆ Melt blown/spunbond non-woven fabrics
◆ Granulation (strand and underwater granulation)
◆ Plastic recycling

Double Piston Screen Changer for Film

Double Piston Screen Chnager for Granulation

Double Piston Screen Chnager for Recycling

Double Piston Screen Changer

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