02,05,2026 16 views
HBzhan Content Introduction: In industries such as coal preparation, metallurgy, chemical engineering, and environmental protection in China, disc vacuum filters, cylinder vacuum filters, centrifuges, belt filters, and plate and frame filter presses are commonly used for solid-liquid separation of suspensions. Most of these methods involve the use of multifilament woven filter cloth and non-woven needle punched filter blankets, which were introduced to foreign equipment in the 1990s.
However, since the 1990s, single fiber filter cloth has been used for solid-liquid separation, significantly improving efficiency. However, due to the high price of imported monofilament filter cloth, only a few domestic units with high requirements for solid-liquid separation technology use imported monofilament filter cloth.
Monofilament filter clothperformance
Monofilament filter cloth is made of synthetic fibers and woven from nylon (PA), polyester (PET), polypropylene (PP), and ethylene (PE) monofilaments. The weaving technology of ordinary monofilament filter cloth is not complicated, and most domestic industrial filter cloth manufacturers can produce it. However, in order to produce high-density special monofilament filter cloth that can meet the requirements of solid-liquid separation process, currently only Sifang Special Filter Cloth Co., Ltd. in Wuxian City, Jiangsu Province can produce it.
The Z53 monofilament nylon filter cloth produced by the company was tested by the Suzhou Textile Quality Supervision Institute CMA in 1996. The main technical parameters of the product, such as fracture strength, fracture elongation, thickness, air permeability, wear resistance, and bursting strength, are all comparable to similar domestic products. After analysis by experts from China University of Mining and Technology, it is believed that the technical level of this product is close to that of similar imported single fiber filter cloth.
Comparison of the performance of several commonly used filter cloths
Due to the rapid wear and fuzzing caused by the medium during solid-liquid separation, the service life of the multifilament woven filter cloth is very short. The non-woven needle punched filter blanket is composed of a polypropylene fiber layer, with a reinforced mesh woven with nylon fibers added to the inner layer. A thin layer of optical film is formed on the surface layer by hot pressing, which increases the strength, improves the dialysis and smoothness compared to the multifilament woven filter cloth, thereby improving the dehydration filtration effect and the service life of the filter cloth to a certain extent. However, it hinders the movement of materials during use.
The author analyzes the designer's concept for two reasons: firstly, from a mechanical perspective. Using angle steel instead of flat steel is simply to increase the strength of the compression plate. Based on the author's actual experience, the probability of the pressure plate breaking is very small; The second is to analyze the process effect. Attempting to increase the resistance of material movement on the screening surface and reduce the speed of material layer movement to improve screening and dewatering efficiency, but this is not always the case in actual production. Due to the excessive thickness of the material layer, the dialysis effect weakens and the screening efficiency actually deteriorates.
In the general coal preparation process, after using screening machinery for the dewatering of fine coal, a centrifuge is also used for secondary dewatering. According to our factory's testing, the moisture content of the vibrating screen product is 17% to 19%. After passing through a centrifuge, the moisture content of the product can be reduced to 6% to meet user needs. Therefore, for the introduction of foreign technology, we should not only see its progressiveness, but also summarize experience, find problems and make improvements in production practice. Through practice, understanding, re practice, and re understanding, we strive to achieve technological rationality day by day.
Suggest the design and manufacturing departments to modify the ZKX2460 screen pressing device. After a fixed cycle, the calendering film wears down, the surface smoothness decreases, and the filter cake is less likely to fall off. Due to the thicker texture of the non-woven filter blanket, the mechanical capacity is reduced, which lowers the efficiency of solid-liquid separation. Monofilament filter cloth has the advantages of smooth surface, thin texture, fast permeability, and high resistance to damage. When used, it not only increases the disposable capacity of the filter machine, but also reduces the clogging of the mesh holes and the automatic detachment of the filter cake, thereby improving the efficiency of solid-liquid separation and reducing the labor intensity of manual cake removal.
Taking Z53 monofilament nylon filter cloth as an example, this product uses 50.25mm nylon monofilament as raw material, weaves five pieces of three fly satin weave, and then undergoes special high-temperature post-treatment to shape its net hole position. It not only has a smooth and shiny surface, but also has a thin texture. The filter cloth has a bearing strength of over 100N per square centimeter, and can withstand tens of thousands of repeated wear and tear under normal use, thereby extending the service life of the filter cloth.
