• Industrial filter cloth and industrial filter mesh applications—belt press filter—papermaking industry—washing and pulp refining
  Filter type: Belt press filter
  Application industry: Papermaking
  Material handling description: Wash and grout
  Filter cloth model: 061R04

The Power of Industrial Filter Cloth in the Papermaking Industry:

From fibers to paper: How belt press filters are transforming the washing and pulping process.

On the production line in the papermaking industry, there’s one process that’s often overlooked yet crucially determines pulp cleanliness, energy consumption during production, and the final quality of the paper. —— Wash grouting ( Pulp Washing & Pressing ) 。
It's like a papermaking system. “ Clear the lungs ” Efficiently remove black liquor, fine fibers, and impurities from the pulp while maintaining an appropriate pulp consistency.
And one of the core components that truly drives the efficient operation of this stage is— Industrial filter cloth and industrial filter mesh 。

On belt press filters, they are not just a single layer. “ Filter medium ” Moreover, it defines the performance limits of the entire equipment: efficiency, stability, solids content in the filter cake, and production costs—all are closely linked to it.

I. Why can’t the papermaking industry do without belt press filters?

The pulp system in the paper-making industry is primarily composed of fibers, with impurities such as bleaching effluent residues, fillers, microfibers, and colloids mixed in.
Relying solely on natural sedimentation can hardly achieve solid-liquid separation. Although traditional disc filtration and vacuum washing are widely used, they are gradually falling behind the pace of modern papermaking lines in terms of concentration stability and pressing efficiency.

Belt press filter ( Belt Press Filter ) Just filled in this missing piece. “ Shortboard ”：

• Continuous operation, high productivity
• Controllable pressure zones, high dehydration efficiency
• The slurry flow is stable, making it suitable for large-scale industrial pulp washing.
• Low energy consumption, can replace some traditional clear water. / Dosage for the steaming and boiling system

But what truly unlocks the value of the belt press filter is that one layer on its surface. “ Industrial filter cloth ”。

II. Industrial Filter Cloth —— The unsung hero behind papermaking, washing, and sizing.

As the slurry passes through the filter belt, the filter cloth performs three critical tasks:

① Filtration and Retention

The structure of the filter cloth determines whether fibers in the slurry can be effectively retained, as well as the rate at which black liquor and impurities are discharged.
Too dense will cause blockage; too sparse will lead to leakage. The filter cloth must be... “ Through ” With “ Interception ” Find a delicate balance between them.

② Conveying and supporting the filter cake

Washing and grouting is a continuous mechanical pressing process, during which the filter cloth must withstand high tension, repeated bending, and walking under pressure for extended periods.
It serves as both a filtering medium and a conveyor belt.

③ Regenerative ability

Pulp is “ Sticky ” It is prone to clogging, especially after bleaching, when the pulp contains fine fibers and colloids.
Whether the filter cloth is easy to clean and whether its replacement cycle is long enough directly affects whether the entire production line can operate stably.

III. Challenges in Filtration During the Papermaking Wash and Pressing Process

Paper pulp is not simple. “ Solid + Water ” but rather a multiphase system with a complex structure:

● Large differences in fiber length

Long fibers are easier to web, while short fibers are more likely to pass through; therefore, a suitable filtration structure is needed to strike a balance.

● Black liquor has high viscosity.

In the treatment of bleached pulp or high-concentration pulp, black liquor often contains large amounts of soluble lignin, which can easily clog the filter surface.

● High pressure gradient for squeezing

Belt press filters are typically divided into a wedge zone, a low-pressure zone, and a high-pressure zone, with each zone having different requirements for the filter cloth.

● High speed, high wear resistance

The speed of the entire papermaking line is increasing steadily, and under high-frequency operation, filter cloths must maintain stable dewatering performance even more urgently.

These challenges all point to one fact:
Filter cloth / The design and performance of the filter mesh determine whether the washing and grouting process can truly achieve its intended efficiency.

IV. Filter Cloth on Belt Press Filters “ Key Performance Indicators ”

To help paper-making enterprises better understand the importance of filter cloths, they can be evaluated from the following perspectives:

● Filtrate permeability

Affects the discharge rate of the wash solution
→ It determines washing efficiency, energy consumption, and the final cleanliness of the pulp.

● Surface stability

The filter surface must be smooth, and the fibers must be evenly distributed.
→ Ensure the quality of filter cake formation.

● Anti-clogging and self-cleaning performance

Long-term operation is not prone to caking.
→ Reduce the frequency of shutdown and cleaning.

● Tension adaptability

The filter cloth must withstand continuous high tension without shifting or jumping.

● Wear-resistant lifespan

Continuous friction +  High-pressure squeezing
→ Determine the replacement cycle and cost.

● Peeling effect

Whether the filter cake is easy to peel off directly affects the slurry recovery rate and the hygienic condition of the equipment.

In the papermaking industry, many production lines have experienced... “ The slurry's moisture content is unstable. “” Decreased washing efficiency “” Equipment deviation ” Problems such as these often stem from the degradation of filter cloth performance or improper selection.

V. Application Scenarios of Belt Press Filters in the Papermaking Industry

In paper mills, belt press filters are used in several critical stages, such as:

1.  Bleaching pulp washing

The filter cloth needs to handle large volumes of high-viscosity black liquor while maintaining high permeability.

2.  Washing of regenerated fibers (waste pulp)

The slurry contains many impurities and fine particles, placing high demands on the filter cloth's anti-clogging performance.

3.  Dewatering of chemical pulp and semi-chemical pulp

The pulp fibers vary in thickness, so the filter cloth must simultaneously possess both supporting strength and retention capability.

4.  Gypsum and filler byproduct treatment

For the dehydration system used in environmental protection applications, the filter cloth must maintain consistent industrial strength.

The commonality of these processes is:
An industrial filter cloth system that can maintain long-term operational stability is required.

Six, why do paper mills ultimately choose professional filter cloth suppliers?

Because the working conditions in papermaking are extremely harsh, filter cloths are not only... “ Buy a piece of cloth. ” The issue affects:

• Washing water consumption
• Bleaching chemical consumption
• Steam consumption
• Slurry recovery rate
• Equipment utilization rate
• Paper Brightness and Cleanliness
• Factory-wide Capacity and Costs

In the papermaking industry, the performance of a filter cloth can directly determine the gap between production costs and product quality.

Equipment manufacturers of belt press filters often regard filter cloth as a key performance indicator.

Professional suppliers can provide:

• Customized filtration structure based on process requirements
• Structural Stability of the Longevity Destiny Path
• Edge Stability Technology for High-Pressure Operation
• Design for Filtration Performance Suitable for Slurry Viscosity and White Water Systems
• Faster delivery, more precise pre-sales support
• Structural Design for Adapting to Belt Press Filters of Different Brands

What a paper mill really needs is never just a roll of cloth—but rather a complete set. Can keep the device maintained. “ Maximum operating efficiency ” the filtering scheme 。

VII. Conclusion: The filter cloth determines the upper limit of wash pressing.

The paper-making industry is a high-energy-consumption sector, and the washing and pressing pulping process happens to be one of the areas where cost reduction and efficiency improvement can be most easily achieved through process optimization.

Equipment is being upgraded, production is accelerating, and processes are being optimized.
As the key operating surface of belt press filters, filter cloth acts as an amplifier of the overall efficiency of the washing and pressing pulping process.

The more a papermaking enterprise strives for high-quality pulp, low-energy production, and stable, continuous operation, the greater its emphasis on the performance and selection of filter cloths.

In the future, as more precise separation, smarter monitoring, and more efficient pressing technologies become widespread, industrial filter fabrics will no longer be merely consumables for equipment—they will instead become a key factor determining the competitiveness of paper mills.