String Wound Filter Cartridge 20 Micron 40 Inch: Wound Depth Filter For Industrial Liquid Filtration
Introduction:If you are sourcing String Wound Filter Cartridge 20 Micron 40 Inch for industrial liquid pre-filtration, chemical fluid clarification and raw water impurity removal, this yarn wound depth filter provides reliable 20 micron particle interception for medium and heavy contamination conditions. Constructed by tightly winding continuous polypropylene yarn around a rigid inner core, it forms a gradient density structure that traps sediment, rust, suspended solids and fibrous contaminants throughout the whole filter depth. It maintains stable flow rate and long service life under fluctuating water quality, effectively protecting RO membranes, ion exchange resin and precision processing equipment. This reusable cleanable filter element is widely used in chemical plants, electroplating workshops, food beverage production, power station water systems and general industrial liquid treatment projects.
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Product Overview
String Wound Filter Cartridge 20 Micron 40 Inch is a classic depth filter element widely adopted in industrial liquid filtration. It is made by winding continuous polypropylene yarn layer by layer onto a solid central support core. By controlling winding tension, the filter forms a gradient structure: loose outer layers and denser inner layers to realize depth filtration. Standard dimension is 40 inch length, outer diameter 60mm, inner diameter 30mm, compatible with all standard 40 inch filter housings. Different from disposable melt blown filters, this string wound cartridge can be cleaned and reused for several cycles under suitable working conditions, reducing long-term operational cost. It can withstand higher pressure and has good resistance to weak acid and weak alkali, suitable for many industrial aqueous liquids and some low-viscosity chemical fluids.
Working Principle
String Wound Filter Cartridge 20 Micron 40 Inch adopts outside-in depth filtration principle. When liquid flows through the wound yarn layers, large particles such as sand and rust flakes are trapped in the outer loose yarn layers. Medium suspended impurities are captured in the middle winding layers. Particles larger than 20 micron are intercepted by the compact inner yarn layers. The multi-layer winding structure distributes contaminants inside the entire filter body instead of only on the surface, so it can hold more dirt before pressure rises. The rigid inner core prevents filter collapse under differential pressure, guaranteeing stable filtration performance during continuous system operation.
Core Technical Specifications
| Item | Parameter |
|---|---|
| Model | String Wound 20μm 40" |
| Material | PP Yarn + PP Support Core |
| Filtration Rating | 20 μm |
| Length | 40 inch (1016 mm) |
| Outer Diameter | 60 mm |
| Inner Diameter | 30 mm |
| Flow Direction | Outside to Inside |
| Max Continuous Temperature | ≤60℃ |
| Max Differential Pressure | 2.0 bar |
| Structure | Gradient Wound Yarn, Rigid PP Core |
| Feature | Cleanable, high mechanical strength, good chemical resistance |
Core Advantages
Gradient wound yarn structure:
Large dirt holding capacity, delays pressure build-up and extends service cycle.
Reusable after cleaning:
Can be rinsed and reused multiple times under proper working conditions to cut filter replacement expense.
High mechanical stability:
Rigid PP inner core prevents deformation and collapse under high pressure.
Wide chemical compatibility:
Resists weak acid, weak alkali and many neutral industrial liquids.
Standard universal size:
Fits common 40-inch filter vessels, simple installation and on-site replacement.
Main Application Scenarios
Reverse osmosis and ultrafiltration system raw water pretreatment
Electroplating liquid, paint and chemical solvent clarification
Food and beverage production process water filtration
Power plant boiler feed water and cooling water purification
Oil-water separation pre-filtration and industrial wastewater treatment
Protection for ion exchange and precision membrane equipment
Compatibility & Cross Reference
| Model | Specification | Application |
|---|---|---|
| String Wound 20μm 40" | 40 inch,20μm PP wound filter | General industrial liquid filtration |
| String Wound 5μm 40" | 40 inch,5μm fine grade wound filter | Precision pre-filtration |
| String Wound 10μm 40" | 40 inch,10μm standard wound filter | Conventional water pretreatment |
| String Wound 20μm 20" | 20 inch short string wound filter | Small water treatment units |
FAQ
Q1: What is the difference between string wound filter and PP melt blown filter?
A1: String wound filter can be cleaned and reused, with better structural strength. Melt blown filter is disposable, normally with higher dirt holding capacity for sediment heavy raw water.
Q2: Can this filter be used for oil-containing liquid?
A2: It can handle low-concentration oily liquid pre-filtration. Heavy oil will quickly block the yarn layer and reduce cleaning efficiency.
Q3: What is the maximum working temperature?
A3: Continuous working temperature cannot exceed 60℃, high temperature will soften the polypropylene material.
Q4: Are other micron grades available?
A4: 1μm,5μm,10μm,20μm,50μm and 100μm are available, with 10/20/30/40 inch lengths for bulk orders.
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