String-wound filters are highly versatile depth filtration cartridges designed to effectively remove suspended particles, sediments, dirt, rust, and contaminants from liquids. Made by winding fibers in an overlapping pattern around a central core, these filters provide exceptional filtration efficiency while maintaining structural integrity, unlike surface filters that rely on a thin membrane to block contaminants, string-wound filters utilize their depth structure to trap particles at multiple levels. This makes them ideal for processes requiring thorough filtration without significant pressure loss
String-wound filters are a part of pre-filtration and fine particle removal processes across industries. Their combination of cost-efficiency, customizability, and high contaminant retention has made them a trusted choice in water and wastewater treatment(CETP,WTP,ETP,STP,Desalination and ZLD), chemical production, surface coating and plating applications and many other critical applications.
Gopani’s string-wound filters are made to meet the standards of performance, durability, and cost-effectiveness. Our filters are trusted across industries from water treatment to oil and gas, food and beverage, desalination plants, pharmaceuticals and more. Gopani’s string-wound filters deliver precision filtration tailored to your needs.
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Every string-wound filter begins with a sturdy, perforated central core. The core serves as the backbone of the filter, providing stability and supporting the yarn or fiber layers. Gopani’s filters utilize core materials like polypropylene for chemical compatibility and stainless steel for high-pressure applications, depending on the specific process requirements.
The “string” or yarn used in string-wound filters plays a critical role in their performance. Gopani uses premium-grade fibers, including:
Each material is selected to match its target application, ensuring optimal contaminant removal and product lifespan.
The yarns used in these filters are produced using techniques such as friction spinning, which convert fibers into yarns with specific structural characteristics. Friction spinning involves the high-speed rotation of drums to twist and bind fibers into a yarn. This method creates a yarn with an airy or fluffy texture, which directly impacts its filtration properties.
The fluffiness increases the void volume within the yarn structure. Void volume refers to the spaces between individual fibers within the yarn. A higher void volume enhances the yarn’s ability to capture and retain particles, as the increased surface area and gaps allow contaminants to be trapped effectively. This structure improves filtration efficiency without significantly hindering the flow of air or liquids through the filter media.
Moreover, yarns produced through friction spinning demonstrate improved resilience and flexibility, enabling the filter to perform consistently under varying operational pressures and conditions. These properties are critical for applications requiring precise and efficient filtration.
Fibers are wound tightly and in a gradient around the core in a controlled spiral/honeycomb pattern. This creates a graded density structure, where the outer layers capture larger particles, while the inner layers trap finer contaminants.
Gopani’s string-wound filters are manufactured with specific micron ratings, ranging from 0.5 micron to 100 microns. Whether your process requires removal of impurities or coarser contaminants, our filters can be tailored to meet those needs with precision.
The core is the central structural component of a string-wound filter cartridge. It serves as the foundation around which the filtration yarn or string is wound, providing strength and stability to the entire filter. The material of construction (MOC) of the core is critical, as it determines the filter’s durability, chemical compatibility, and temperature resistance. Selecting the right core material ensures optimal performance for specific filtration applications.
The core serves several essential purposes:
Gopani’s string-wound filters are manufactured with specific micron ratings, ranging from 0.5 micron to 100 microns. Whether your process requires removal of impurities or coarser contaminants, our filters can be tailored to meet those needs with precision.
Customised solutions for your filtration process with our string wound filters.
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Selecting the right core depends on several factors:
By carefully evaluating these factors, you can ensure optimal performance, longevity, and cost-efficiency for your filtration system.
End connections and gaskets ensure a secure fit between the filter cartridge and the housing, preventing leakage and maintaining process integrity. Common end caps include DOE (Double Open End), SOE (Single Open End), and customized fittings, while gaskets are typically made from elastomers like EPDM, silicone, or PTFE.
Importance and Function
End connections provide structural stability and compatibility with various filter housings, ensuring easy installation and replacement. Gaskets create a reliable seal, preventing bypass and ensuring that only filtered fluid passes through.
MOC of End Caps and Gaskets
Customised solutions for your filtration process with our string wound filters.
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The world is facing an acute water crisis, seawater desalination and clean water treatment are essential. String-wound filters are important for pre-filtration solutions in reverse osmosis (RO) systems. By removing sediments, silt, and particulate matter, these filters reduce membrane fouling, ensuring cleaner water output and extending membrane life.
Gopani’s string-wound filters ensure >90% removal of suspended solids, safeguarding critical downstream RO systems and improving overall process efficiency.
Wastewater treatment plants face the challenge of removing solids and contaminants to meet environmental discharge standards or enable water reuse. Gopani’s filters help reduce Total Suspended Solids (TSS) efficiently, acting as a reliable pre-treatment option before biological and chemical treatment stages.
Gopani filters are designed for high dirt-holding capacity, minimizing replacements and ensuring continuous, cost-effective operation.
In food and beverage production, maintaining product purity and quality is critical. Gopani’s string-wound filters remove impurities like sediments, rust, and particulates without compromising taste, texture, or product integrity. They are widely used for:
Key Stats
Why Gopani Filters?
Gopani’s filters offer desired filtration that are safe for food and beverage production, ensuring clean, compliant operations.
Oil field operations rely on filtration systems to remove contaminants from well fluids, fuels, and lubricants. String-wound filters helps in preventing equipment damage, reduce maintenance costs, and improve operational efficiency.
Industry Stats
Why Gopani Filters?
Gopani filters provide high-temperature resistance and durability for challenging oil field applications.
Power plants require high-quality feed water for boilers, turbines, and cooling systems. Even small impurities can cause scaling and corrosion, leading to efficiency loss and expensive repairs. String-wound filters are critical for pre-treating boiler feed water and protecting sensitive equipment.
Relevant Data
Why Gopani Filters?
Gopani’s string-wound filters ensure precise particle removal and steady flow rates, preventing downtime and saving energy costs.
Pharmaceutical industries demand high-purity water for drug formulation, laboratory applications, and sterile processes. Contaminants like particulates, rust, and bacteria can compromise product quality and safety. Gopani’s string-wound filters offer exceptional purity and reliability.
Key Insights
In the semiconductor industry, ultra-pure water (UPW) is essential for cleaning, etching, and manufacturing processes. Even microscopic contaminants can lead to product defects and operational losses. Gopani’s string-wound filters deliver precision filtration for ultrapure water systems.
Key Insights
Why Gopani Filters?
Gopani filters ensure reliable filtration of plating baths, providing the purity essential for defect-free production.
Customised solutions for your filtration process with our string wound filters.
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Gopani offers custom solutions to meet specific needs, including customized micron ratings, sizes, and material compatibility, ensuring optimal performance for every application.
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Filtration ensures consistency and removes impurities that can affect the quality of paints and inks.
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The manufacturing of string-wound filters involves a precise process to create reliable and effective filtration solutions. It starts with selecting high-quality yarns, such as polypropylene, cotton, or polyester, based on the intended application and the properties needed for filtration. These yarns are wound tightly around a sturdy central core made from materials like polypropylene or stainless steel.
The winding process is performed using specialized CNC machines to ensure even tension and consistent layering of the yarn. This method creates a graded density structure, which allows the filter to trap larger particles on the outer layers while capturing finer contaminants within the inner layers. The result is a durable and effective filter cartridge suitable for various industries, including water treatment, food processing, pharmaceuticals, and petrochemicals.
The winding process is performed using specialized CNC machines to ensure even tension and consistent layering of the yarn. This method creates a graded density structure, which allows the filter to trap larger particles on the outer layers while capturing finer contaminants within the inner layers. The result is a durable and effective filter cartridge suitable for various industries, including water treatment, food processing, pharmaceuticals, and petrochemicals.
The core is the central structural component of a string-wound filter cartridge. It serves as the foundation around which the filtration yarn or string is wound, providing strength and stability to the entire filter. The material of construction (MOC) of the core is critical, as it determines the filter’s durability, chemical compatibility, and temperature resistance. Selecting the right core material ensures optimal performance for specific filtration applications.
It provides strength to prevent the filter from collapsing under pressure.
Ensures the filter performs effectively in corrosive environments.
Maintains functionality at high or low operating temperatures.
Extends the operational life of the filter by resisting wear
Polypropylene Core:
Stainless Steel Core (SS304/SS316):
Tinned Steel Core:
Glass-Reinforced Polypropylene Core:
Polycarbonate Core:
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Selecting the right core depends on several factors:
By carefully evaluating these factors, you can ensure optimal performance, longevity, and cost-efficiency for your filtration system.
Filtration is essential for removing contaminants from chemicals and polymers
Filtration is a key process in refining and protecting equipment from fouling
Microelectronics manufacturing requires ultra-clean environments.
Filtration ensures consistency and removes impurities that can affect the quality of paints and inks.
Filtration of compressed air and gases is critical for removing oil, water, and particulate contaminants.
Get Customized filtration solutions for water treatment. Food and beverages, pharmaceuticals, and more. Get the perfect fit for your industry.
The yarns used in string-wound filters are a critical component, as they directly interact with the fluid being filtered. The material of the yarn determines the filter’s ability to retain particles, resist chemical degradation, and withstand varying temperatures. Different yarn materials are chosen based on the filtration application, ensuring compatibility with the liquid’s chemical properties and operating conditions.
Polypropylene
Cotton
Polyester
Nylon
Fiberglass
Selecting the right MOC for your process involves understanding the specific requirements of the application. Factors such as the chemical composition of the fluid, operating temperature, pressure conditions, and cost constraints must be carefully evaluated.
Whether handling aggressive chemicals or fine particulates, our filters are built to meet industry demands.
Choose precision, reliability, and performance for your filtration needs.
Selecting the appropriate yarn material depends on:
Selecting the right MOC for your process involves understanding the specific requirements of the application. Factors such as the chemical composition of the fluid, operating temperature, pressure conditions, and cost constraints must be carefully evaluated.
Micron rating is a parameter in filtration, representing the particle size a filter can remove from a fluid. It is expressed in micrometers (µm), with smaller micron ratings indicating finer filtration capability. This property directly impacts the efficiency and suitability of a filter for specific applications, from coarse sediment removal to ultra-fine filtration of contaminants.
The micron rating ensures compatibility between the filter and the application’s needs. Choosing the right micron rating enhances process efficiency, protects equipment from damage, and ensures the quality of the filtered product. For example, a high micron rating is ideal for removing large particles in preliminary filtration, while a low micron rating is necessary for critical processes such as pharmaceutical-grade filtration.
Gopani provides customizable micron ratings to meet specific requirements. Customers can select the desired micron size based on the type of fluid, nature of impurities, and operational demands, ensuring precise and efficient filtration.
Whether handling aggressive chemicals or fine particulates, our filters are built to meet industry demands.
Choose precision, reliability, and performance for your filtration needs.
The winding process involves wrapping yarn around a core to create the gradient density required for particle capture. Different techniques include tight winding, loose winding, and multi-layer winding.
The winding pattern directly influences the pore size and distribution within the filter. Tighter winding results in smaller micron ratings for finer filtration, while looser winding produces larger micron ratings for coarse filtration. By adjusting the tension and layering, manufacturers can achieve the desired filtration efficiency.
Gopani provides customizable micron ratings to meet specific requirements. Customers can select the desired micron size based on the type of fluid, nature of impurities, and operational demands, ensuring precise and efficient filtration.
End connections and gaskets ensure a secure fit between the filter cartridge and the housing, preventing leakage and maintaining process integrity. Common end caps include DOE (Double Open End), SOE (Single Open End), and customized fittings, while gaskets are typically made from elastomers like EPDM, silicone, or PTFE..
End connections provide structural stability and compatibility with various filter housings, ensuring easy installation and replacement. Gaskets create a reliable seal, preventing bypass and ensuring that only filtered fluid passes through.
Whether handling aggressive chemicals or fine particulates, our filters are built to meet industry demands.
Choose precision, reliability, and performance for your filtration needs.
With 3 decades of experience in designing high-performance filtration solutions, Gopani ensures reliability and efficiency in industrial processes.
Our filters are widely used in industries such as water treatment, pharmaceuticals, chemicals, oil and gas, and food and beverage, meeting the most stringent quality standards.
Designed with precision, the graded density structure captures contaminants of varying sizes, ensuring efficient filtration and extended service life.
Available in diverse materials such as polypropylene, cotton, and glass fiber, these filters cater to applications across industries like chemicals, oil & gas, food & beverage, and more.
Offering micron ratings from 1 to 100 microns and various cartridge lengths, Gopani ensures filters meet specific operational and process requirements.
Engineered for durability, the filters maintain high performance even in challenging conditions, reducing replacement frequency and downtime.
Optimized design minimizes pressure loss, ensuring smooth flow rates and operational efficiency.
The Clary Wound 3X variant is a patented design for ultra-efficient filtration. Its unique winding pattern enhances dirt-holding capacity and operational efficiency.
Ideal for industries demanding high filtration performance, including petrochemicals, pharmaceuticals, and electronics.
Whether handling aggressive chemicals or fine particulates, our filters are built to meet industry demands.
Choose precision, reliability, and performance for your filtration needs.
104 Kashi Parekh Complex, Swastik Cross Road, B/h Bhagwati Chambers, C. G. Road, Navrangpura, Ahmedabad – 380009. Gujarat, India.
Ph: +91-706 901 8049