40-inch Wire-wound Filter Cartridge: Filter Cartridge for Fiber Impurity Interception in Papermaking White Water and Sizing Liquid

Product Introduction

This 40-inch wire-wound filter cartridge is a heavy-duty industrial filtration component exclusively engineered for efficient fiber impurity interception in papermaking white water recycling systems and sizing liquid preparation processes, manufactured in strict compliance with papermaking industry industrial filtration standards and environmental protection recycling specifications. Crafted from high-strength polypropylene (PP) wire as the filtration medium and a rigid reinforced PP porous inner core, the cartridge features a standardized 40-inch length optimized for large-flow papermaking production lines, adopting a precision dense wire-wound spiral structure combined with an adhesive-free hot-melt integral sealing design at both ends. It is specially tailored for the characteristics of papermaking white water and sizing liquid—high fiber content, suspended solid impurities, and the demand for continuous large-flow filtration and water resource recycling—and efficiently captures free fiber scraps, fiber clumps, pulp residues, and insoluble solid particulate impurities from papermaking white water (including process white water, washing white water) and various papermaking sizing liquids (starch-based, synthetic resin-based sizing agents). The cartridge realizes high-efficiency impurity removal without altering the physical and chemical properties of white water and sizing liquid, effectively improving the cleanliness of recycled white water and sizing liquid, protecting subsequent papermaking equipment such as paper machines, sizing machines, and nozzles from abrasion and blockage, and promoting the recycling of papermaking water resources to reduce production water consumption. With high dirt-holding capacity, excellent anti-scouring performance and stable filtration efficiency, this product is perfectly matched with the large-flow filtration systems of papermaking enterprises, realizing long-term continuous and efficient filtration, reducing the frequency of filter cartridge replacement, and laying a solid foundation for improving papermaking product quality, ensuring continuous production of paper machines and achieving green and low-carbon papermaking production.

Filtration Precision

Targeting the differentiated fiber impurity interception requirements of papermaking white water recycling and sizing liquid preparation, as well as the quality requirements of different grades of paper products (cultural paper, packaging paper, specialty paper), this 40-inch wire-wound filter cartridge provides a full range of stable and industrial-grade filtration precision options, with nominal filtration ratings ranging from 10 μm to 120 μm—the core specification range for efficient fiber and solid impurity removal in the papermaking industry. The 10 μm, 20 μm and 30 μm high-precision models are suitable for fiber impurity interception in sizing liquid for high-grade papermaking (art paper, coated paper, specialty cultural paper) and fine white water recycling for high-quality paper production, achieving efficient interception of fine fiber scraps and micro pulp residues to ensure the uniformity and smoothness of sizing liquid coating, and avoid paper surface defects such as fiber spots and unevenness; the 40 μm, 60 μm and 80 μm medium-precision models are applied to fiber removal in conventional papermaking white water recycling (newsprint, offset paper) and general packaging paper sizing liquid, effectively capturing most free fiber scraps and suspended solid impurities to balance filtration precision, large-flow filtration demand and filter cartridge service life; the 100 μm and 120 μm coarse-precision models are designed for primary filtration of high-fiber-content raw white water and crude sizing liquid in bulk papermaking production, removing large fiber clumps, pulp lumps and massive solid impurities to protect subsequent fine filtration equipment and reduce the filtration load of high-precision filter cartridge models. All precision models maintain consistent and non-attenuating interception efficiency for fiber and solid impurities during long-term filtration of papermaking white water and sizing liquid, with zero impurity penetration and excellent resistance to the scouring of high-flow liquid with fiber impurities, fully meeting the stringent filtration quality requirements of the papermaking industry for fiber impurity removal in white water and sizing liquid.

Flux

The flux performance of this 40-inch wire-wound filter cartridge is fully optimized for the 40-inch standardized large-length design, the large-flow characteristics of papermaking production lines and the physical properties of papermaking white water and sizing liquid, with a pure water flux of 120-200 L/min·m² at 25℃ and 0.1MPa operating pressure—a high-flux design exclusively adapted to the large-volume filtration demand of papermaking enterprises. As a standardized 40-inch industrial filter cartridge, its initial pure water flux reaches 96-160 L/min, which perfectly matches the single/multi-core large-flow filtration housings in papermaking white water recycling and sizing liquid filtration systems, and is suitable for small, medium and large-scale papermaking production lines from small batch specialty paper production to mass industrial paper manufacturing. For low-fiber-content papermaking white water and low-concentration sizing liquid, the actual working flux is basically consistent with the pure water flux, and the flux attenuation rate is extremely low during long-term use due to the high dirt-holding capacity design; for high-fiber-content raw white water and medium-concentration sizing liquid, the actual initial flux is reduced by 30%-45% under the same working conditions, and the precision wire-wound spiral structure delays flux attenuation caused by fiber impurity accumulation, avoiding frequent flux reduction that affects the continuous operation of papermaking production lines. The low-resistance spiral wire-wound channel design ensures that the flux does not decrease sharply with the reduction of filtration precision, meeting the continuous large-flow filtration demand of papermaking white water recycling and sizing liquid preparation, without causing pressure loss or liquid circulation stagnation in the filtration system, and ensuring the normal production rhythm of papermaking enterprises and the efficiency of white water recycling.

Salt Rejection Rate

As a dedicated 40-inch wire-wound filter cartridge for fiber impurity interception in papermaking white water and sizing liquid, the product is designed only for the physical interception of insoluble fiber scraps, fiber clumps, pulp residues and solid particulate impurities in liquid, and does not have any desalination, ion removal or dissolved substance retention function, with a salt rejection rate close to 0%. It neither intercepts soluble inorganic salts, water-soluble sizing agents, starch hydrolysates, wetting agents and other functional chemical components in papermaking white water and sizing liquid nor affects the pH value, conductivity, solid content, viscosity and other key physical and chemical properties of the liquid, and has no impact on the sizing effect, paper forming performance and recycling efficiency of white water. The ion adjustment, chemical component control and concentration adjustment of papermaking white water and sizing liquid are completed in the pretreatment and formulation process; the core function of this filter cartridge is to remove insoluble fiber and solid impurities in the liquid during filtration, ensure the cleanliness of recycled white water and sizing liquid, avoid the blockage of paper machine wire parts, sizing nozzles and pipeline valves caused by fiber clumps, and prevent the abrasion of precision papermaking equipment. The abandonment of desalination design makes the cartridge adopt a high-flux, low-resistance wire-wound structure focused on fiber impurity interception, which is the key to realizing its efficient filtration performance adapted to the large-flow characteristics of papermaking production and the characteristics of fiber-rich liquid.

Pressure Drop

This 40-inch wire-wound filter cartridge adopts an optimized ultra-low resistance precision wire-wound spiral structure and high-fluidity high-strength PP wire medium, with an initial pressure drop of ≤0.009MPa at 25℃ and rated pure water flux for all filtration precision specifications—far lower than the industry standard for papermaking industrial filter cartridges. This ultra-low initial pressure drop effectively reduces the energy consumption of the delivery and circulating pumps in papermaking white water and sizing liquid filtration systems, avoids excessive pressure loss in the filtration link, and ensures the normal liquid delivery pressure and circulation efficiency, preventing the reduction of white water recycling efficiency and sizing liquid coating uniformity caused by insufficient pressure. During long-term filtration, the pressure drop of the cartridge increases in a slow and linear manner with the gradual accumulation of intercepted fiber and solid impurities, rather than a sudden sharp rise; the recommended terminal operating pressure drop is uniformly set to ≤0.08MPa for all precision models. The slow pressure drop rise rate is a core advantage of the dense wire-wound spiral structure, which allows for longer continuous use time, reduces the frequency of shutdown and filter cartridge replacement operations for the filtration system, and ensures the uninterrupted operation of papermaking white water recycling systems and paper machine production lines. Even for papermaking white water with slight fluctuations in fiber content, the pressure drop rise rate remains stable, avoiding sudden pressure changes in the liquid circulation system caused by rapid fiber impurity accumulation, and ensuring the stable operation of papermaking production processes.

Molecular Weight Cutoff (MWCO)

Combined with the filtration precision, 40-inch dense wire-wound density, fiber impurity characteristics of papermaking white water and sizing liquid and the demand for efficient impurity interception, the optimized Molecular Weight Cutoff (MWCO) range is 100,000 Da to 500,000 Da for this 40-inch wire-wound filter cartridge, specially tailored for the interception of macromolecular fiber aggregates and insoluble particulate aggregate impurities in papermaking liquid. This MWCO range is precisely designed for the physical interception of fiber-based insoluble impurities, and can effectively capture macromolecular impurities such as cellulose fiber aggregates, pulp residue clusters, fiber clump polymers and insoluble solid particulate aggregates (MW > 100,000 Da) in papermaking white water and sizing liquid, while allowing all small and medium molecular weight functional components (water-soluble sizing agents, inorganic salt additives, starch small molecular hydrolysates, surfactants) in the liquid to pass through smoothly and completely. For different filtration precision models, the MWCO range is adaptively and precisely adjusted based on the density of the wire-wound structure: the 10/20/30 μm high-precision models have a MWCO of 100,000 Da-250,000 Da for intercepting fine fiber aggregates and micro pulp residue clusters in high-grade papermaking sizing liquid and fine white water; the 100/120 μm coarse-precision models have a MWCO of 350,000 Da-500,000 Da for capturing large fiber clumps and massive pulp lumps in high-fiber-content raw white water and crude sizing liquid. The stable MWCO setting without deviation during long-term filtration achieves the dual goal of efficient fiber impurity removal and complete retention of liquid functional components, ensuring that the filtered white water and sizing liquid fully meet the application, recycling and papermaking production quality requirements.

Membrane Thickness

This 40-inch wire-wound filter cartridge adopts a reinforced gradient thickness filtration layer design specially adapted to the 40-inch large-length design, the high-fiber-content characteristics of papermaking liquid and the long-term filtration anti-scouring demand, with an effective functional filtration layer thickness of 8-15 mm—significantly thicker than conventional short-length wire-wound filter cartridges to maximize dirt-holding capacity and structural stability for fiber impurity interception. The cartridge adopts a standardized industrial outer diameter design matching the 40-inch length, fully compatible with the installation size of standard large-flow industrial multi-core filter housings in papermaking enterprises, without the need for additional modification of existing filtration and recycling equipment, complying with the standardized and large-scale production requirements of the papermaking industry. The filtration layer is formed by precision spiral winding of high-strength PP wire with gradient diameter on the reinforced inner core, composed of a loose and wear-resistant outer layer (4-6 mm) with relatively large wire spacing for the primary interception of large fiber clumps, pulp lumps and massive solid impurities in papermaking liquid, and resistance to the strong scouring of large-flow liquid with fiber impurities; a medium-density middle layer (2-5 mm) with moderate wire spacing for the secondary interception of medium-sized fiber scraps and suspended solid particulates, maximizing the dirt-holding capacity of the cartridge and delaying flux attenuation and pressure drop rise; and a dense and high-precision inner layer (2-4 mm) with fine wire spacing for the ultra-fine interception of fine fiber scraps and micro pulp residues, ensuring the filtration precision corresponding to different models. The whole filtration layer is formed by one-time precision wire winding and hot-melt fixing, with uniform thickness distribution, tight wire combination and excellent structural stability, avoiding local excessive pressure, wire loosening and filtration layer damage caused by the long-term scouring of large-flow fiber-rich liquid, and the reinforced thickness design significantly extends the service life of the cartridge in the filtration of papermaking white water and sizing liquid.

Replacement Cycle

The replacement cycle of this 40-inch wire-wound filter cartridge is scientifically designed according to the fiber content, impurity concentration, daily filtration volume and filtration precision of papermaking white water and sizing liquid, with a recommended normal replacement cycle of 4-10 weeks for the fiber impurity interception link—flexibly adjustable according to the actual production conditions of papermaking enterprises and the grade of paper products produced. For the filtration of low-fiber-content fine white water and high-grade papermaking sizing liquid (10/20/30 μm models) and small to medium daily filtration volume conditions, the replacement cycle can be appropriately extended to 8-10 weeks (especially for specialty paper and high-grade cultural paper production lines); for the filtration of conventional fiber-content papermaking white water and general sizing liquid (40/60/80 μm models) and large daily filtration volume of mass production lines, the replacement cycle is 6-8 weeks; for the primary filtration of high-fiber-content raw white water and crude sizing liquid (100/120 μm models) and ultra-large daily filtration volume of bulk packaging paper production lines, the replacement cycle is still maintained at 4-6 weeks for all operating conditions. The cartridge only needs to be replaced immediately when the terminal pressure drop exceeds 0.08MPa, the filtration flux drops by more than 30% of the initial value and cannot be recovered after backwashing, or papermaking products appear quality defects such as fiber spots, surface unevenness and sizing failure caused by unremoved fiber impurities; regular replacement is not required within the recommended cycle, which greatly reduces the replacement frequency of filter cartridges and the production downtime of papermaking lines, effectively controls the production and filtration cost of papermaking enterprises, and ensures the continuous and stable operation of white water recycling systems.

Features

40-inch standardized large-length industrial design: Adopts a customized 40-inch large-length structural design, matching the installation size of standard large-flow filter housings in papermaking enterprises, with strong universality and exclusive adaptation to the large-flow filtration demand of papermaking white water recycling and sizing liquid preparation, no need for additional equipment modification.
High-strength PP wire winding & reinforced inner core: The filtration medium is high-strength wear-resistant PP wire, matched with a rigid reinforced PP porous inner core, with excellent structural stability and anti-scouring performance, adapting to the long-term scouring of large-flow papermaking liquid with fiber impurities, no wire loosening, fiber shedding or inner core deformation during use.
Adhesive-free hot-melt integral sealing: Advanced one-piece hot-melt sealing process at both ends of the cartridge without any adhesives, binders or sealants, eliminating the risk of chemical additive leaching into papermaking white water and sizing liquid and secondary pollution, ensuring the purity of the liquid and the quality of papermaking products.
Gradient wire spacing spiral winding structure: The filtration layer adopts a gradient wire spacing spiral winding design from loose to dense, realizing multi-stage interception of fiber and solid impurities of different sizes in papermaking liquid, maximizing the dirt-holding capacity, avoiding rapid filter layer blockage and ensuring stable filtration efficiency for a long time.
Ultra-low initial pressure drop & high flux: Optimized low-resistance spiral wire-wound channel and high-fluidity PP wire medium design ensure ultra-low initial pressure drop and high filtration flux, reducing the energy consumption of papermaking liquid circulating and delivery pumps, and meeting the large-flow filtration demand of papermaking production lines.
Superior chemical compatibility with papermaking liquid: Resistant to water-soluble sizing agents, starch hydrolysates, inorganic salts, weak acids, weak alkalis and trace surfactants in papermaking white water and sizing liquid, maintaining stable physical and chemical properties without material dissolution or structural damage, adapting to all types of papermaking white water and sizing liquid filtration.
High dirt-holding capacity & slow pressure drop rise: The thickened filtration layer and gradient wire spacing design significantly improve the impurity storage capacity for fiber scraps and pulp residues, making the pressure drop rise in a slow linear manner during long-term use, extending the continuous service life and reducing filter cartridge replacement frequency.
High mechanical stability & pressure resistance: The integral reinforced structure has excellent compressive strength (resistant to 0-0.6MPa operating pressure), no deformation or structural damage under the high pressure of papermaking liquid delivery pumps, and can work stably in the temperature range of 0-70℃, adapting to the harsh industrial production environment of papermaking mills.
Backwashable & reusable: The PP wire filtration layer with spiral winding structure is easy to carry out physical backwashing with clean water or compressed air, and the cleaned cartridge can be reused for a short time, further reducing the filtration cost and resource consumption of papermaking enterprises.
Eco-friendly & recyclable: The monolithic pure PP material structure has no mixed materials, and the discarded cartridges can be recycled and reused in accordance with plastic waste treatment standards, meeting the green, low-carbon and circular economy development requirements of the modern papermaking industry.
Stable batch consistency & easy storage: The standardized industrial production process and strict quality inspection ensure the stable filtration performance of each 40-inch cartridge and high batch consistency, avoiding filtration efficiency fluctuations caused by filter cartridge differences; the sealed and moisture-proof packaging design is easy to store in papermaking mill workshops with harsh environmental conditions.

Application Fields

This 40-inch wire-wound filter cartridge is a dedicated industrial filter cartridge for fiber impurity interception in papermaking white water and sizing liquid, and is widely applied to the filtration and fiber impurity removal link of various papermaking production lines in the papermaking and paper processing industry, covering all core papermaking processes that require white water recycling and clean sizing liquid: fiber impurity interception in process white water and washing white water recycling systems of cultural paper production (art paper, coated paper, offset paper, newsprint); fiber and solid impurity removal in sizing liquid preparation for packaging paper production (corrugated paper, carton board, kraft paper); fine fiber removal in white water recycling and sizing liquid filtration for specialty paper production (thermal paper, carbonless copy paper, filter paper); fiber impurity interception in papermaking white water recycling of household paper production (toilet paper, facial tissue, kitchen paper); filtration and impurity removal of starch-based, synthetic resin-based and composite sizing liquid for all types of paper machines; and primary filtration of high-fiber-content raw white water in papermaking wastewater pretreatment and recycling. In addition, the product can also be used for the filtration of fiber-rich industrial liquid and the removal of solid particulate impurities in other light industry and printing and packaging fields with similar filtration requirements, complying with industrial filtration quality standards in all application scenarios, and is an indispensable core industrial filtration component for improving papermaking product quality, promoting water resource recycling and ensuring continuous papermaking production.

Conclusion

In summary, this 40-inch wire-wound filter cartridge is a high-performance professional industrial filtration solution custom-tailored for fiber impurity interception in papermaking white water and sizing liquid, with the core competitive advantages of 40-inch large-length high-flux design, high anti-scouring performance, ultra-low pressure drop, high dirt-holding capacity and strong compatibility with papermaking liquid—solving the industry pain points of papermaking filtration such as large-flow demand, high fiber impurity content, frequent filter cartridge replacement and low white water recycling efficiency. Based on high-strength PP wire winding and reinforced inner core, combined with an adhesive-free hot-melt sealing structure, the cartridge efficiently and continuously removes all insoluble fiber scraps, fiber clumps, pulp residues and solid particulate impurities in papermaking white water and sizing liquid during long-term filtration, on the premise of 100% retaining the functional components, physical and chemical properties and application performance of the liquid, ensuring the cleanliness of recycled white water and sizing liquid, avoiding the blockage and abrasion of paper machine, sizing machine and other key papermaking equipment caused by fiber impurities, and effectively reducing papermaking product defects such as fiber spots, surface unevenness and sizing failure, thus improving the overall quality of paper products. The 40-inch standardized large-length design realizes perfect matching with existing large-flow filtration and white water recycling equipment of papermaking enterprises, with strong universality and no need for additional modification; the ultra-low initial pressure drop and high flux design reduce the energy consumption of papermaking liquid circulation systems, and meet the large-scale production demand of papermaking enterprises; the high dirt-holding capacity and slow pressure drop rise rate extend the service life of the filter cartridge, reduce the replacement frequency and production downtime, and effectively control the production cost of papermaking enterprises. The excellent chemical compatibility and mechanical stability adapt to the filtration of various types of papermaking white water and sizing liquid and the harsh industrial production environment of papermaking mills; the backwashable and recyclable design further improves the cost performance and environmental protection of the product, and is in line with the circular economy development concept of the papermaking industry. As a dedicated industrial filter cartridge for the papermaking industry, it not only provides a reliable filtration guarantee for the cleanliness of papermaking white water and sizing liquid but also lays a solid foundation for promoting the recycling of papermaking water resources, reducing production water consumption and realizing green papermaking production. It is the first choice for fiber impurity interception in white water recycling and sizing liquid filtration in cultural paper, packaging paper, specialty paper and household paper production enterprises of all scales.

Related Products

10/20-inch Wire-wound Filter Cartridge for Papermaking: Same PP wire-wound structural design filter cartridges with different lengths, matching the small and medium-flow filtration demand of papermaking auxiliary processes and small-scale papermaking production lines.
PP Melt Blown Filter Cartridges for High-grade Papermaking Sizing Liquid: High-precision melt blown filter cartridges with 1-5 μm filtration precision, used for the fine filtration of high-grade specialty paper sizing liquid in conjunction with this 40-inch wire-wound cartridge.
Standard Large-flow Multi-core Stainless Steel Filter Housings: 40-inch matching filter housings with multi-core design (3/5/7 cores), compatible with this wire-wound filter cartridge, with high pressure resistance and corrosion resistance, suitable for papermaking white water recycling large-flow filtration systems.
Activated Carbon PP Filter Cartridges for Papermaking Liquid: Used in conjunction with the 40-inch wire-wound cartridge, adsorbing trace organic impurities, peculiar smell and residual solvents in papermaking sizing liquid, further improving the purity of the liquid and the surface quality of paper products.
Coarse Filtration Steel Mesh Filter Cartridges for Papermaking: 150-200 μm coarse filtration steel mesh cartridges for the pre-filtration of high-fiber-content raw white water, removing massive pulp lumps and fiber clumps, reducing the filtration load of this 40-inch wire-wound filter cartridge.
Industrial Circulating Pumps for Papermaking White Water: Anti-corrosion and anti-clogging large-flow circulating pumps matched with the 40-inch filter cartridge, with adjustable flow rate and head, adapting to the circulating filtration of papermaking white water with different fiber contents.

40-inch Wire-wound Filter Cartridge for Papermaking White Water and Sizing Liquid Fiber Impurity Interception Filter Cartridge