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Non Woven Filter Fabric

Non woven filter fabric Spunbond filtration media HVAC filter material Coolant filter cloth

We manufacture spunbond polypropylene non woven filter fabric for air and liquid filtration systems. The random fiber web traps particles throughout the fabric thickness — depth filtration — so the filter holds more contaminant before pressure drop forces a change-out than a surface-only woven mesh. Weights run 15–100 gsm for applications from respirator support layers to heavy coolant filter beds.

• Depth filtration structure: high particle-holding capacity

• 100% virgin PP; inert to solvents, oils, and alkalis

• 15–100 gsm matched to micron retention targets

• Hydrophilic or hydrophobic surface treatments

• High MD/CD tensile strength for pleating lines

• Slit rolls from 20 cm up to 2.4 m; no chemical binders

Service & Delivery

OEM & ODM accepted
Tensile and basis-weight test data per batch
Sample rolls available before bulk order

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Filter Fabric Specifications at a Glance

Parameter	Details
Material	100% virgin polypropylene (PP)
Process	Spunbond extrusion, thermally bonded (no chemical binders)
Filtration	Depth filtration for air and liquid media
Fabric Weight	15–100 gsm, set by micron retention target
Chemical Resistance	Inert to industrial acids, alkalis, and synthetic coolants
Strength	High MD/CD tensile strength for automated pleating
Treatments	Hydrophilic (liquid passage) / hydrophobic (air passage)
Width	Precision slit rolls, 0.2 m up to 2.4 m
Applications	HVAC air media, coolant filtration, dust collection, medical PPE
MOQ	1–2 tons per specification (roll format)
Lead Time	Samples: 3–5 days; Bulk: 20–30 days after sample approval and deposit

Filter Fabric Types We Make

Air Filtration: Retention Without Pressure Drop

Air filtration works only if the media traps particles without choking airflow. Our fabric is calibrated so the fiber density captures the target particle range while keeping air resistance low — the factor that determines an HVAC system's fan energy cost. The thermally bonded web also holds together through the rapid folding of automated pleating lines, where weaker media cracks along the crease and lets dust bypass the filter.

Liquid Filtration: Chemical Resistance in Coolant Systems

In metalworking, the filter fabric separates metal swarf from cutting fluid on continuous gravity-bed systems. The job is chemical as much as mechanical: synthetic coolants and oils attack many polymers, but PP stays inert. Porosity is set so the fabric removes fine sludge without restricting fluid return to the machine, which cuts fluid replacement cost and reduces hazardous waste volume. For water-based liquids, a the pore structure is engineered to pass water freely while holding solids.

Customization Options for Bulk Orders

Filter roll orders are custom projects. The following options can be combined freely — tell us which matter most to your system, and we will build around them.

Option	Available Choices
Width	Precision slit widths (e.g. 20 cm, 50 cm) from 2.4 m master rolls
Porosity	Fiber density set to your micron retention target
Surface Chemistry	Hydrophilic for liquid passage; standard hydrophobic for air
Roll Length	Continuous meter lengths set to your converter's uptime needs
Packaging	PE film-sealed rolls for a dust-free state in transit

Custom Filter Fabric Projects

About Changyuan Nonwoven

We are a nonwoven fabric and bag manufacturer based in Changzhou, China, running a full production line from raw material to finished goods since 2012. Our factory handles fabric extrusion, 7-color gravure printing, lamination, and bag making in-house, serving clients in 20+ countries with a daily output of 200,000 pieces.

Company factory how we work

FAQs

What is depth filtration?

Depth filtration traps particles through the full thickness of the fabric web rather than blocking them at the surface. Because the contaminant load spreads through the material instead of caking on top, the filter holds more particles and lasts longer before pressure drop forces a change-out.

Why is PP used for filtration instead of other polymers?

PP does not react with industrial solvents, synthetic cutting oils, or wastewater chemistry, so the media stays intact and does not contaminate the filtered stream. It also bonds thermally without chemical glues, which removes any leaching risk in sensitive processes.

Can the fabric filter water-based liquids?

Yes. Raw PP repels water, so standard fabric suits air and oil duty. A hydrophilic surface treatment changes the fiber surface so water passes through freely while solids are retained — the specification for water-based filtration.

Why does roll consistency matter on pleating lines?

Pleating lines run at high speed under constant tension. Thickness variation produces uneven folds, and fabric with weak MD/CD tensile values tears under line tension or bursts under operating pressure. Consistent slit width and per-batch tensile data are what keep converter yield up.

What customization options are available for filter rolls?

You can set the gsm to target a micron range, choose hydrophilic or hydrophobic surface treatment, and specify the exact slit width — down to the centimeter — cut from 2.4 m master rolls to match your framing equipment.

Does the bonding process add chemicals to the filtered medium?

No. The web is bonded by heat, not adhesives. No chemical binders are used anywhere in the structure, so nothing leaches into the air or liquid stream — a requirement in medical and food-contact filtration.

How to Specify Non Woven Filter Fabric for Air and Liquid Systems

Specifying filter cloth comes down to one trade-off: retention versus flow. Catch finer particles and the filter loads faster, drawing more energy to push air or liquid through; catch coarser particles and the system stays efficient but the fluid stays dirty. Fabric weight, porosity, and surface treatment are set around where your system needs to sit on that curve.

Depth Filtration Versus Surface Filtration

The structural difference between nonwoven and woven media explains most of the performance gap. A woven mesh blocks particles at its surface, so it blinds — clogs — quickly. Spunbond nonwoven traps particles through the full thickness of the web, holding several times the contaminant load before pressure drop forces replacement.

Mechanism	Characteristics	Typical Use
Depth (nonwoven)	Particles trapped through the web; slow pressure rise; long change-out interval	HVAC pleated panels, coolant beds, dust bags
Surface (woven)	Particles blocked at the surface; blinds quickly; needs frequent backwashing	Sieves, screens, wash-down applications

Why PP, and Why Weight Matters

PP is the default filtration polymer because it does not react with industrial solvents, synthetic oils, or wastewater chemistry, and because thermal bonding — not chemical glue — holds the web together, so nothing leaches into the filtered stream. Weight sets retention level: light grades protect rather than filter, medium grades handle general HVAC and cabin air duty, and heavy grades capture fine sludge in liquids.

Fabric Weight	Behavior	Recommended Use
15–30 gsm	High air permeability, low retention; protects inner media	Respirator and mask support layers
40–70 gsm	Balanced porosity and pleating strength	HVAC panels, cabin air filters
80–100 gsm	Dense web for fine capture in liquids	Coolant beds, heavy dust bags

What to Verify Before Ordering

Pleating lines punish inconsistency: thickness variation causes uneven folds, and weak MD/CD tensile values cause web breaks under line tension or bursts under operating pressure. Ask for per-batch tensile and basis-weight data before comparing prices, and specify slit width to your framing equipment — trimming on the line is where most converters lose yield.