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Jan 03, 2025
Horizontal belt filter cloths generally have a front side and a back side, and correct installation is crucial for stable operation and optimal dewatering performance. The front side (working side) should face the slurry material, while the back side faces the equipment.
Below are the key differences and identification methods summarized by Bolian Filtration.
Front side (working side):
Usually treated with special finishing processes such as calendering, resulting in a smoother and denser surface.
Back side (non-working side):
Typically remains in its original state, with a rougher and more open surface structure.
Front side (working side):
Comes into direct contact with slurry materials. The smooth surface helps the filter cake release easily and reduces adhesion, while the dense structure improves solid particle retention.
Back side (non-working side):
Contacts the vacuum box, support rollers, and other machine components. The rough surface provides better friction, helping maintain stable belt tracking.
If the working side faces the wrong direction:
Filter cake discharge becomes difficult, scrapers cannot remove cake effectively, and dewatering efficiency decreases. Incomplete cake removal also reduces the effective filtration area.
If the non-working side contacts the vacuum box:
Increased friction may accelerate wear on both the filter cloth and the vacuum box.
The smooth and glossy surface is usually the working side.
The rough and matte surface is the back side.
When rubbing both sides by hand, the side with less resistance is the working side.
Many filter cloths have brand names, model numbers, or arrows on the surface.
Arrows indicate running direction, not the front or back side.
Basic rule:
The smooth working side must face upward toward the slurry, while the rough side faces downward toward the vacuum box and support components.
Cloth connection:
When joining the filter cloth into a loop, ensure the front and back sides remain consistent. Incorrect alignment may cause uneven joints, belt misalignment, or damage.
In summary, vacuum belt filter cloth does have a front and back side, and correct installation is essential.
Remember the rule: “Smooth side toward material, rough side toward equipment.”
Proper inspection before installation and careful observation during operation can effectively prevent reduced dewatering efficiency and abnormal cloth wear.
If you are unsure about the orientation or encounter operating issues, Bolian can provide targeted technical support and professional guidance.
