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String Wound Filter Cartridge manufacturer-LOONG FILTRATION
String Wound Filter Cartridge manufacturer-LOONG FILTRATION String Wound Filter Cartridge manufacturer-LOONG FILTRATION

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String Wound Filter Cartridge

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  • WPF

  • Microelectronics, Food & Beverage, Water Treatment

  • Depth Filters

  • PP, Glass fiber (GF)

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String Wound Filter Cartridge - High Dirt Capacity Depth Filtration for Water & Industrial Liquids


The String Wound Filter Cartridge is manufactured using precisely controlled winding technology to create a unique depth filtration structure. Textile fibers are tightly wound in a honeycomb pattern around a porous core, forming a gradient density profile (looser outside, denser inside) that maximizes dirt holding capacity. This three-dimensional construction provides extensive internal filtration surface area, effectively removing suspended solids, rust, and particulate matter from various fluids. As an economical pre-filtration solution, it offers excellent performance in particle retention, clarification, and security filtration applications across multiple industries including drinking water treatment, chemical processing, RO pretreatment, and industrial oil filtration.


APPLICATIONS
• Water Treatment: Pretreatment of drinking water; security filtration for RO/NF (Reverse Osmosis/Nanofiltration) systems; clarification of industrial water.

• Chemical Products: Particulate filtration of acid-base solutions, chemical reagents, photosensitive solutions, inks, and acrylic raw materials.

• Electroplating Baths: Removal of impurity particles in electroplating baths to improve the quality of plated parts.

• Industrial Oil Filtration:

    • Lubricating Oil Filtration: Used for circulating filtration of lubricating oil in equipment such as machine tools and compressors.

    • Hydraulic Oil Filtration: Removal of contaminants in hydraulic systems to protect precision hydraulic components.

    • Cutting Fluid Filtration: Extension of the service life of cutting fluid and improvement of processing quality.



BENEFITS OF STRING WOUND FILTER CARTRIDGE 

• Deep Filtration Structure

Honeycomb winding forms a gradient density with a hydrophobic exterior and dense interior, enabling true deep filtration and a large dirt-holding capacity.

• High Porosity & Permeability

The special winding process ensures high porosity, resulting in low operating pressure difference and large flow rate.

• Wide Chemical Compatibility

Different material fibers (PP, cotton, glass fiber, etc.) can be selected according to the properties of the liquid.

• High Cost-Effectiveness

As a pre-filtration cartridge, its cost is significantly lower than that of membrane cartridges, and it can effectively protect downstream precision equipment.

• Multiple Precision Options

Filtration precision ranging from 1 micron to 100 microns is available to meet different requirements.


MATERIALS OF CONSTRUCTION

Filter materials
Polypropylene (PP), Degreased cotton, Glass Fiber
Support
Polypropylene, Stainless Steel


PERFORMANCE CHARACTERISTICS

Max.  Temperature
PP＜60 ℃
Degreased cotton＜120 ℃
Glass Fiber＜200 
Max. Differential Pressure
＜2.0 bar, 25 ℃


DIMENSIONS

Outer Diamete
63 mm,115mm
Inner Diamete
28 mm,30mm
Length
9.87", 10", 20",30",40"


PORE SIZE RATING (μm)
1, 5, 10, 20, 30, 50, 75, 100





SERIES MATERIAL RATING(μm) END CAP LENGTH(in) SUPPORT
Electronics PP 1.0μm 222/Fin 10'' PP
Phamarmical cotton 3.0μm 222/Flat 20'' 304
Chemical
5.0μm 226/Fin 30''
Beverage
10μm 226/Flat 40''


20μm DOE/Flat

SERIES MATERIAL RATING(μm) LENGTH(in) SEAL SUPPORT
D-HFA PP 0.45μm 20'' SilFlange DN25icone PP

GF 1.0μm 30'' EPDM GF

PBT 5.0μm 40'' Butyronitrile PBT

304 10μm 60'' Viton Outer Cage

316L



SERIES MATERIAL RATING(μm) LENGTH(in) SEAL SUPPORT
D-HFA PP 0.45μm 20'' Silicone PP

GF 1.0μm 30'' EPDM GF

PBT 5.0μm 40'' Butyronitrile PBT

304 10μm 60'' Viton Outer Cage

316L




SERIES MATERIAL RATING(μm) LENGTH(in) SEAL SUPPORT
HFA PP 0.45μm 20'' Silicone PP

GF 1.0μm 30'' EPDM GF

PBT 5.0μm 40'' Butyronitrile PBT

304 10μm 60'' Viton Outer Cage

316L



download String Wound Filter from LOONG Filtration.pdf


Which type of filtering method is most suitable for industrial water treatment?

What you're aiming to remove will have a big impact onthe kind of filtration system you choose. For substances such as chlorine, you only need to use activated carbon filters. For water with too much hardness, the industrial water softening system is needed to deal with.For iron-removing or suspended sediments, the best way to deal with them is filtering through oxidation and depthor multimedia filters. For bacteria and viruses in water,reverse osmosis, sub-micron filtration, and ultraviolet sterilization are good choices.


What are the key factors in selecting the right filter cartridge?

Key factors include micron rating, flow rate, chemical compatibility, operating pressure, temperature, and the type of contaminants to be removed. Our engineers can help you choose the optimal filter element for your application.

 

How often should filter cartridges be replaced?

Replacement intervals depend on operating conditions, contaminant load, and pressure drop. Regular monitoring and our technical support can help optimize maintenance schedules and reduce downtime.

 

How do you ensure consistency in filter cartridge performance?

We use automated production, strict quality control, and batch testing to ensure every cartridge meets precise performance and durability standards.


Do you provide technical support and training?

Absolutely. Our engineers offer ongoing support, installation guidance, and training to help you maximize filter performance and operational efficiency.

 


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