PP liquid filter bags are needle-felt or woven filtration media made from polypropylene fibers, designed for removing suspended solids from liquids.
Technical Parameter
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Raw material |
100% Polypropylene / PP NLMO |
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Grade of filtration |
1-200 μm |
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Final Surface Treatment |
Calendering |
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Working temperature:°C |
≤80 |
Peak Temperature: 94 |
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Resistance to acids |
Excellent |
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Resistance to alkali |
Excellent |
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Collar |
SS304 PP/PE |
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| Quality degrees | Excellent – Good – Medium - Less good – Not recommended (*) | |
This document and all information contained herein belong to KESKAY FILTER. It may not be copied, passed on to third parties or used for any other purpose without the written consent of KESKAY FILTER. KESKAY FILTER reserves the right to change specifications without notice.
Applications
Chemicals, wastewater, pharma, beverage.
Liquid Filter Bags, designed for efficient removal of solid impurities, particles, and contaminants from various liquid streams, are widely utilized across industries that demand precise liquid purification, process optimization, and compliance with quality or environmental standards.
petrochemical industry
In the petrochemical industry, they play a critical role in refining processes such as crude oil pretreatment, lubricating oil filtration, and fuel polishing. For instance, during crude oil processing, liquid filter bags with high-temperature resistance (up to 150℃) and chemical stability trap sand, rust, and asphaltene particles, preventing damage to downstream pumps, valves, and refining equipment. In lubricating oil maintenance, they remove metal shavings and wear debris, extending the oil's service life and ensuring the smooth operation of industrial machinery. Their filtration efficiency (down to 1μm particle retention) also helps meet the strict purity requirements for aviation fuel and automotive gasoline.
01
food and beverage industry
In the food and beverage industry, food-grade Liquid Filter Bags (compliant with standards like FDA 21 CFR Part 177 and EU 10/2011) are indispensable for liquid processing. In beverage production-such as fruit juice, beer, and soft drinks-they clarify liquids by removing pulp residues, yeast cells, and sediment, enhancing product clarity and taste while avoiding off-flavors caused by impurities. In dairy processing, they filter milk and whey to eliminate bacteria clusters and protein aggregates, ensuring compliance with food safety regulations. Additionally, in edible oil refining, they trap phospholipids, free fatty acids, and solid impurities, improving the oil's color and shelf life without altering its nutritional properties.
02
pharmaceutical industry
The pharmaceutical industry relies on high-purity Liquid Filter Bags for critical processes like drug formulation, API (Active Pharmaceutical Ingredient) purification, and sterile water treatment. These filter bags, often made of polypropylene or PTFE with ultra-fine pore sizes (0.2-5μm), remove microbial contaminants, colloidal particles, and undissolved drug residues from liquid formulations. During injectable drug production, they ensure the liquid meets sterility standards by trapping bacteria and endotoxins, preventing adverse reactions in patients. In herbal extract processing, they filter out plant fibers and cell debris, concentrating the active components while maintaining the extract's chemical stability-critical for ensuring consistent drug efficacy.
03
water treatment and wastewater management sector
In the water treatment and wastewater management sector, Liquid Filter Bags are used for both industrial wastewater pretreatment and municipal water purification. For industrial applications-such as printing and dyeing, metal plating, and electronics manufacturing-they remove suspended solids (e.g., dye particles, heavy metal precipitates, and silica fines) from wastewater, reducing the load on advanced treatment systems (like RO membranes or ion exchangers) and lowering operational costs. In municipal water treatment, they pre-filter raw water to eliminate sand, algae, and organic matter, protecting subsequent disinfection equipment (e.g., UV lamps or chlorine injectors) and improving the quality of tap water. They are also employed in cooling tower water systems to remove scale-forming particles, preventing pipe clogging and improving heat exchange efficiency.
04
Furthermore, Liquid Filter Bags find applications in the automotive and machinery industry (for coolant and hydraulic fluid filtration, removing contaminants that cause system leaks or component wear), the paint and coating industry (filtering pigments and resin particles to ensure a smooth, even finish), and the electronics industry (for ultrapure water filtration in semiconductor wafer cleaning, trapping ions and micro-particles that could damage sensitive circuits). Their versatility-available in various materials (polypropylene, nylon, PTFE), pore sizes (1-100μm), and configurations (sock-style, pleated)-along with low maintenance costs and easy replacement, makes them a reliable and cost-effective solution for liquid purification across diverse industrial scenarios.
Maintenance & Lifespan
1. Back flushing or gentle washing (avoid abrasive tools);
2. Lifespan depends on contaminant load: 3-12 months.
Workshop
Filter Material Workshop
The Filter Material Workshop has established a full-process quality control system and is equipped with advanced intelligent filter material testing instruments to conduct real-time monitoring of filter materials during the production process. The testing items cover key indicators such as air permeability, filtration precision, breaking strength, and elongation. The sampling inspection rate for each batch of products is not less than 8%, and the testing standards not only comply with relevant national regulations but also are higher than the enterprise's self-control standards which are above the industry average level, ensuring the stable and reliable quality of the filter materials leaving the factory.
Bag Workshop
Relying on the flexible adjustment capability of production lines, the workshop can quickly respond to personalized needs. For the high-temperature working conditions of blast furnace gas treatment, it customizes extended high-temperature filter bags and enhances the tightness of the bag mouth snap ring; for filter bags produced for waste incineration projects, an anti-corrosion coating treatment is added. At the same time, the deviation of the half-circumference and length of the filter bag is accurately controlled according to the model of the dust removal equipment, and the deviation value is strictly within the standard range.
Bag Cage Workshop
The workshop has established a full-process quality control system and is equipped with professional testing equipment such as diameter measuring instruments, coating thickness detectors, and tensile testing machines. Each batch of skeletons must go through four key links: appearance inspection (no burrs, flat welding spots), dimension inspection (diameter and length error ≤ ±1mm), coating test (adhesion meets Grade 1 standard of GB/T 9286-1998), and load-bearing test (no deformation under load ≥50kg). The sampling inspection rate is not less than 10%, ensuring that 100% of the delivered products meet the ISO9001 quality standard and the enterprise's internal control requirements.
Enterprise honor
Behind the honor of being a national-level high-tech enterprise is the enterprise's full-chain strength support from R&D to production. With an annual production capacity of 2 million filter bags and 3 million square meters of needle-punched felt, combined with automated production lines, the enterprise has transformed its technological advantages into industrial advantages, highlighting its leading position in the field of environmental protection filter materials.
Package
The packaging of our company's dust filter bags and cages fully complies with national industrial product packaging standards, environmental protection packaging specifications and relevant industry requirements, and strictly follows the principles of safety, environmental protection and standardization to ensure that the packaging is up to standard and compliant.
In terms of packaging materials, all packaging materials (PE bags, cartons, wooden boxes, buffer materials, etc.) meet national environmental protection standards, are non-toxic, tasteless and recyclable, avoiding environmental pollution; in terms of packaging process, we strictly implement the classification packaging specifications for industrial products, package products according to their specifications and materials, and strictly prohibit mixed packaging to ensure standardized and compliant packaging. At the same time, clear marks such as product name, specification, quantity, manufacturer, moisture-proof, handle with care and stacking limit are marked on the packaging, which meets the requirements of industry packaging marks. We can provide packaging compliance test reports and relevant certification documents according to customer needs to ensure that customers have no worries in the process of procurement, warehousing and transportation.
Transportation
Our company's transportation of dust filter bags and cages fully complies with national industrial transportation standards and relevant industry regulations, and strictly abides by the requirements of environmental protection and safe transportation.
In terms of packaging, we use environmentally friendly and non-toxic packaging materials that meet national environmental protection standards, avoiding pollution to the environment. In terms of transportation, we strictly implement the classification and isolation system, prohibit mixed transportation of hazardous materials, and ensure that the transportation process is safe and compliant. All transportation vehicles are equipped with professional safety facilities, and the drivers are trained professionally to master the correct loading, unloading and transportation methods of filter bags and cages. We will provide relevant compliance certificates according to customer needs to ensure that your procurement and use process is worry-free.
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