One-Piece Molded Bag Filter

The One-Piece Molded Bag Filter is a high-efficiency, precision industrial liquid filtration solution engineered for global industrial applications. 

Unlike traditional bag filters that feature welded or spliced casings—prone to leaks, corrosion, and structural failure—this filter adopts an advanced seamless one-piece molding process (high-temperature injection molding or die-casting) for its entire housing and core structure, with zero welds or splicing gaps to eliminate hidden leakage risks.

Engineered with optimized fluid flow channels (optional top-in/bottom-out or side-in/bottom-out modes), it is fitted with a heavy-duty reinforced internal support basket to firmly fix filter bags and ensure uniform fluid distribution across the filtration area. This design supports both coarse pre-filtration and fine precision graded filtration, operating reliably in harsh working conditions including corrosive media, high-temperature fluids and conventional liquid treatment. It serves as a cost-effective, high-performance upgrade for traditional spliced bag filters and cartridge filters, addressing core pain points of industrial filtration systems worldwide.

Featuring a compact, space-saving structure and flexible installation modes, this filter can run as a standalone unit for small-scale treatment or be configured in parallel arrays for high-flow industrial processing. It fully caters to customized filtration demands of diverse production scales, delivering stable solid-liquid separation, efficient impurity interception and high-standard fluid purification for various industrial sectors.

Core Technical Features

Seamless One-Piece Integrated Construction: The fully molded, gap-free housing eradicates welds, structural weak points and leakage hidden dangers, boasting exceptional sealing performance and stable pressure resistance. This design eliminates liquid leakage, cross-contamination and structural damage prevalent in welded filters, making it perfectly suitable for high-pressure and strongly corrosive operating environments.

High-Grade Material Customization: Available in food/industrial-grade PP polypropylene and 304/316L stainless steel to match diverse application scenarios. PP models deliver superior resistance to strong acids, alkalis and organic solvents; stainless steel models excel in high-temperature, high-pressure and hygienic production environments, fully complying with strict global industrial hygiene and safety standards.

Wide-Range Precision Filtration: Compatible with custom-molded filter bags with a precision range of 0.5μm–300μm, supporting both coarse filtration for large particulate impurities and fine filtration for micro-impurities. The high-open-area support basket maximizes effective filtration area, enhances dirt-holding capacity, reduces clogging risks and prolongs filter bag service life.

Tool-Free Quick-Release Design: Equipped with a quick-open top cover or clamp seal, paired with corrosion-resistant silicone/FKM gaskets for a tight, reliable seal. Filter bag replacement and equipment cleaning can be completed in minutes without specialized tools, greatly simplifying daily maintenance. The smooth, crevice-free inner wall prevents residue buildup and bacterial growth, meeting hygienic production requirements.

Extreme Durability & Operational Stability: The one-piece molded structure offers outstanding impact resistance and deformation resistance, ensuring stable long-term operation even under heavy-duty, high-load conditions. The robust support basket keeps filter bags stable under high-flow and high-impurity fluid impact, reducing downtime and lowering maintenance frequency.

Unmatched Core Advantages

Zero Leakage, Consistent Filtration Quality: The seamless integrated structure eliminates medium leakage and cross-flow, maintaining stable filtration precision at all times. This safeguards product purity for quality-critical industries such as pharmaceuticals, food & beverage and electronics, avoiding product quality defects and unexpected production losses.

Lower Total Cost of Ownership (TCO): Tool-free maintenance cuts labor costs and equipment downtime significantly; most matched filter bags are cleanable and reusable, reducing consumable expenses. The ultra-durable construction minimizes full-unit replacement frequency, delivering superior long-term value compared to traditional filtration equipment.

Extensive Application Versatility: Fully customizable in material, filtration precision, flow rate and connection types (flange, quick-fit, threaded). It adapts to normal, high-temperature, high-pressure and strongly corrosive liquid conditions, suitable for small-scale laboratory testing and large-scale industrial production lines alike.

Space-Saving & Rapid Deployment: Compact design saves valuable workshop space, with flexible vertical/horizontal installation options and mobile unit compatibility. No complex civil engineering is required, enabling fast on-site installation and quick commissioning to shorten production startup cycles.

Global Regulatory Compliance: Meets strict international standards including food hygiene (FDA, EFSA), pharmaceutical GMP and environmental emission regulations, ensuring full compliance for cross-border industrial operations and hygienic production processes.

Key Technical Parameters Reference Table

Parameter Item	PP Polypropylene Model	304/316L Stainless Steel Model
Filtration Precision	0.5μm–300μm	0.5μm–300μm
Operating Temperature	-20℃ ~ 80℃	-20℃ ~ 150℃ (316L up to 180℃)
Working Pressure	≤0.6MPa	≤1.0MPa
Media Adaptability	Strong acids, alkalis, organic solvents, corrosive liquids	High-temperature fluids, hygienic media, neutral/weak corrosive liquids
Connection Type	Threaded/Quick-fit	Flange/Threaded/Quick-fit
Flow Rate Range	5–100m³/h (single/multi-bag configurable)	5–200m³/h (single/multi-bag configurable)

Wide Application Industries

This seamless one-piece molded bag filter is widely applied in liquid purification and solid-liquid separation across major global industries, covering core scenarios as follows:

Water Treatment: Municipal wastewater purification, industrial circulating water filtration, pure water pretreatment, electroplating/printing and dyeing wastewater treatment, reclaimed water reuse.

Chemical Industry: Chemical raw liquid filtration, organic solvent refining, coating/ink/adhesive impurity removal, chemical reagent purification.

Food & Beverage: Juice, wine, drinking water, syrup, edible oil and dairy product filtration, ensuring taste and food hygiene compliance.

Pharmaceutical & Biotechnology: Pharmaceutical liquid purification, biological agent filtration, bottle washing water treatment, GMP-compliant hygienic filtration.

Petroleum & Energy: Oilfield produced water filtration, lubricating oil purification, diesel/gasoline impurity removal, petrochemical liquid treatment.

Electronics & Surface Coating: Electroplating solution filtration, electrophoretic paint purification, ultrapure water preparation, electronic grade liquid treatment.

Frequently Asked Questions (FAQ)

Q1: How to select the right one-piece molded bag filter for my industrial application?

A1: Selection is based on three core parameters: 1)Medium properties: Choose PP for corrosive liquids, 304/316L stainless steel for high-temperature/hygienic media; 2) Flow rate & treatment capacity: Select single-bag or multi-bag parallel units based on daily processing demand; 3) Filtration precision: Match 0.5μm–300μm filter bags to impurity particle size. We provide free customized selection services for global customers to match your unique working conditions.

Q2: What is the replacement cycle of the filter bag?

A2: The replacement cycle depends on impurity content and continuous operating hours: 3–6 months for standard working conditions; for high-impurity applications, monitor the inlet-outlet pressure difference—replace or clean the filter bag when the pressure reaches 0.1–0.15MPa to maintain optimal filtration efficiency and avoid equipment blockage.

Q3: Can this filter handle high-temperature and highly corrosive liquids?

A3: Yes. The PP model operates stably at -20℃ to 80℃ for strong acid/alkali and organic solvent environments; the 316L stainless steel model withstands -20℃ to 150℃ for high-temperature hygienic media. We offer custom material and seal solutions to fit your specific medium and temperature requirements.

Q4: Is professional installation and maintenance required?

A4: No. The filter is equipped with standardized universal connectors, and installation only requires pipeline connection and fixed placement—no professional technicians needed. Routine maintenance only involves regular bag replacement/cleaning, which can be completed by general operators with simple product training.

Q5: Do you offer customized solutions for special industrial requirements?

A5: Absolutely. We provide full customization including flow rate (single/multi-bag units), filtration precision, connection types, dimensions, and supporting accessories (pressure gauges, quick-release devices, alarm systems) to meet your unique process and installation needs.

PP filter bag