In most paper mills, cooking, bleaching, and papermaking are the core processes that are repeatedly mentioned, while... “ Wash grouting ” This step often remains hidden at the margins of process flow diagrams. Yet in reality, this procedure determines the pulp’s cleanliness, energy consumption metrics, chemical usage, fiber recovery rate, and even the paper’s physical properties.
And one of the key components that ensures the stable and efficient operation of the entire washing and grouting process is— —— Industrial filter cloth and filter mesh belts 。

As the papermaking industry continues to evolve toward higher cleanliness, higher whiteness, and lower energy consumption, belt press filters have become one of the standard pieces of equipment in many modern paper mills, and the performance of filter cloths is even regarded as... “ Can the grouting wash be successful? ” The decisive factor.

Xiamen Xiadis ( Faster As a leading brand in the research and manufacturing of technical fabrics for domestic filtration materials (mesh belts), we have accumulated extensive application experience with belt press filters in the paper-making industry. We continuously provide high-performance industrial filter cloths and filter mesh belts for production lines handling bleached pulp, chemi-mechanical pulp, recycled pulp, and other similar materials.

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

The core tasks of washing and grouting include:

• Remove black liquor and soluble impurities.
• Improve pulp cleanliness and enhance subsequent bleaching performance.
• Increase the pulp concentration to improve papermaking efficiency.
• Recycle fibers and chemicals to reduce production costs.

Although traditional vacuum pulping equipment (such as vacuum drum pulpers and disc filters) is well-established, it is gradually failing to meet modern papermaking requirements in the following aspects:

• Limited dehydration efficiency
• High water consumption
• Thin pulp layer, high fiber loss
• Difficult to adapt to high-concentration, high-viscosity slurries.

In comparison, the belt press filter ( Belt Press Filter ) By virtue of its sectional pressing (wedge-shaped zone — Low-pressure area — High-pressure zone) and a continuous dehydration structure, achieving:

• High washing efficiency
• Capable of handling high-concentration slurries
• The solid content of the filter cake is stable.
• Continuous production, high output.
• Low energy consumption, lower maintenance costs.

But the key foundation for all efficiency ultimately rests on something that seems simple yet is actually highly technically sophisticated. “ Filter cloth ” Above.

II. Industrial Filter Cloth / The core role of the filter mesh belt in washing and slurry pressing

In a belt press filter, the filter cloth serves not only as the filtration medium but also as an integral part of the pressing system. “ Operating platform ”。

Its core function can be summarized as:

1.  Filtration and Retention

The filter cloth must effectively separate the fibers from the black liquor in the slurry as the pressure is gradually increased.
The filter layer structure must simultaneously possess:

• Rapid fluid drainage
• High retention rate
• Uniform filter cake formation

If the filter cloth is too dense, it will lead to difficulties in dewatering; if it’s too sparse, it will cause fiber loss and affect the pulp yield.

2.  Continuous Conveying and Mechanical Support

The belt press filter is... “ Filtering, conveying, and pressing simultaneously. ” A continuous system.
The filter cloth needs to withstand:

• High tension
• Long-term flexion
• Roller friction
• Filter cake peeling impact

Any structural instability, deviation, or uneven expansion and contraction will cause the entire line to shut down.

3.  Anti-clogging and self-cleaning

The pulp used in papermaking contains colloidal substances, fine fibers, and filler particles, which readily adhere to the surface of the filter cloth.
Therefore:

• Surface structure
• Backwash effect of clear water
• Fabric layer thickness
• Surface flatness

Both determine whether the filter cloth can maintain long-term operation.

4.  Filter cake forming quality

A good filter cake determines the efficiency of water flow exchange in the washing stage.
An uneven filter cake can cause:

• Insufficient local compression
• Dehydration rate decreases
• Backmixing, back black liquor

This, in turn, affects the quality of subsequent bleaching and the brightness of the paper.

III. Typical Challenges in the Papermaking, Washing, and Pressing Processes

The complexity and variability of pulp make stringent technical demands on filter cloths:

● High viscosity, high black liquor content

Bleached pulp or recycled pulp contains large amounts of lignin and hemicellulose, which can cause surface blockage.

● Fibers vary in length.

The filter cloth must not only trap long fibers but also effectively control the loss of fine fibers.

● The pressure zones have a large span.

The wedge-shaped area requires flexible filtration, while the high-pressure area demands a robust and durable structure.

● Complex operating conditions

High-speed operation +  High-humidity environment +  Chemical residues—any material fatigue can lead to failure.

Therefore, industrial filter fabrics must strike an optimal balance among filtration performance, strength, and stability—and this is precisely the technical expertise that Xiadis excels in.

IV. Core Advantages of Xadias Industrial Filter Fabrics and Filter Mesh Belts in the Papermaking Industry

As a leading brand in the domestic filtration materials and technical textiles industry, Xiamen Xiadis ( Faster ) Filter cloth for belt press filter machines / In terms of mesh belts, we have over 30 Years of experience and participation in the development of relevant technical standards.
Its products exhibit extremely high compatibility and stability in the papermaking industry.

The following advantages are the main reasons why paper-making customers choose Xadias:

1.  Highly stable filter structure design

Based on the characteristics of paper-making pulp, Xadias designs a specialized filter layer structure that enables the filter cloth to simultaneously:

• Fast dialysis rate
• High fiber retention rate
• The surface is smooth and the filter cake is uniformly formed.
• Strong water-wash recovery ability

Whether it's bleached pulp, recycled pulp, or chemi-mechanical pulp, all can maintain stable dewatering performance.

2.  Excellent anti-blocking performance and long-term operational capability

Xiadis filter cloth features an optimized structural design that reduces pulp blockage from multiple angles, including fabric layer thickness, surface texture, and drainage channels.

In actual use:

• Wash even more thoroughly.
• Not easily compacted
• Long service life
• Cleaning cycle extended
• Effectively reduce downtime

It is particularly well-suited for handling pulp systems with high black liquor content and a large proportion of fine fibers.

3.  Optimized tension adaptability and resistance to slippage.

One of the most common problems with belt press filters is:

• Deviate
• Uneven stretching
• Edge wear

Through advanced weaving technology and reinforced edge structures, Xadias filter fabrics achieve:

• High-tension stability
• Edge-reinforced design makes it difficult to tear.
• More stable running trajectory
• Adapt to high-pressure pressing environments

Significantly reduce misalignment alarms and unnecessary downtime.

4.  Longer service life and lower total cost

Industrial filter cloth is often not “ Price determines value. ” , but rather “ Lifespan determines cost. ”。
Via Xadias:

• High-wear-resistant fiber structure
• Precise organizational design
• Fatigue resistance performance for high-pressure rollers

This results in filter cloth lifespans that are generally longer than the industry average, and for some customers, the service life has been significantly extended. 30% ~ 50%。

5.  Customization available for various belt press filters.

Xia Días can cover all common device brands, including:

• ANDRITZ
• Voith
• Valmet
• Various types of belt press machines available domestically
• Paper mill's self-made equipment

And offers a variety of processing methods:

• Edge wrapping
• Custom connector
• Precise size cutting
• Special cleaning device matching
• Optimized Design of Fluid Properties
• OEM / Supplied by the equipment manufacturer as a package.

Many paper-making equipment manufacturers’ very first original filter cloths came from Xadias.

V. Typical Application Scenarios for Washing and Pressing Slurry with Belt Press Filters

In the papermaking industry, filter cloth. / The mesh belt is mainly used in the following process stages:

1.  Bleaching pulp washing ( Bleached Pulp Washing )

The slurry has high whiteness, but the black liquor has high viscosity, requiring strong water permeability and anti-clogging performance.

2.  Washing of recycled pulp ( Recycled Pulp )

It contains many impurities and has short fibers, requiring high precision in the structure of the filter cloth.

3.  Mechanical pulp dewatering ( CMP/CTMP )

It has high fiber adhesion and requires a high-strength support layer as well as excellent abrasion resistance.

4.  White water recycling and environmentally friendly dewatering

For processes such as sludge dewatering and filler recovery within the plant, high wear resistance and stability are required.

These applications share the following common characteristics:
The filter cloth is required to operate stably for a long period under high-pressure, high-speed, and highly polluted conditions.
This is precisely the reason why Xadias has earned a long-standing reputation in the industry.

VI. The Profound Impact of Filter Cloth Selection on Paper Mill Costs

Choosing the right filter cloth can bring:

• Improved washing efficiency 5% ~ 20%
• Increased slurry recovery rate
• Reduced water consumption
• Reduced chemical usage
• Steam consumption decreased.
• Reduced equipment downtime and cleaning frequency
• Overall line energy consumption optimization
• Ultimately, paper brightness and cleanliness are improved.

For a paper mill, this isn't just a piece of cloth—it's a systematic efficiency asset.

And Xadias' strengths lie in:
Not only do we provide filter cloths, but we also offer... “ A complete filtration solution tailored for papermaking processes ”。

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

In papermaking, the washing and pressing process often determines the energy balance point of the production line, the amount of chemicals used, and the cleanliness of the pulp.
As the core washing equipment in modern paper mills, the performance of the belt press filter hinges crucially on this very belt. “ Seems ordinary ” filter cloth.

Xiamen Xiadis, with thirty years of experience, a sophisticated technical fabric system, and over... 400 The capability to develop industrial filtration media, coupled with our deep-rooted expertise in the field of filter mesh belts, is making us an increasingly trusted long-term partner for more and more papermaking companies.

In the future, amid the overarching trend toward energy-saving, efficient, and green papermaking, the value brought by high-performance industrial filter cloth far exceeds that of the equipment’s surface layer. ——
It determines the efficiency boundary of the entire production line.