Melt Filter Cartridge – For Nonwoven & Strapping Band Industries
Product Overview
Melt filter cartridges are core filtration elements engineered for high‑temperature, high‑pressure, and high‑viscosity polymer melt filtration. They are manufactured from micron‑grade metal fibres through nonwoven lapping and high‑temperature sintering. The multi‑layer metal fibre felt forms a gradient pore structure that enables precise filtration control and provides excellent dirt‑holding capacity.
This series is specifically designed for spunbond/meltblown nonwoven production lines and PET/PP strapping band manufacturing, ensuring clean melt for stable processing and superior end‑product quality.
Application Fields
Nonwoven Industry
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Melt filtration in spunbond nonwoven lines
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Polymer melt purification in meltblown nonwoven production
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Melt filtration for PET staple fibre and FDY filament manufacturing
Strapping Band Industry
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Melt purification before PET/PP strapping extrusion
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Removal of impurities, gels, and unmelted particles in strapping production
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Filtration for recycled material pelletising
Other Applications
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Chemical fibre & textile: PET chips, staple fibre, filament melt filtration
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Plastic extrusion/injection: pelletising, film, pipe production
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Petrochemical: polypropylene, polyethylene polymer melt purification
Product Specifications
| Model | Diameter (mm) | Length (mm) | Typical Application |
|---|---|---|---|
| D35×L425 | 35 | 425 | Standard for small/medium lines |
| D35×L485 | 35 | 485 | Extended length for longer service life |
| D35×L525 | 35 | 525 | Extra‑long for high‑capacity lines |
| D50×L507 | 50 | 507 | Large flow for big nonwoven lines |
| D60×L507 | 60 | 507 | Extra‑large flow for ultra‑high output |
Note: Custom diameters, lengths, and filtration ratings are available upon request.
Technical Parameters
| Parameter | Specification |
|---|---|
| Maximum Operating Pressure | ≤31.7 MPa |
| Maximum Operating Temperature | ≤300 °C |
| Filtration Precision | 0.5 – 300 μm (selectable) |
| Filter Media | Stainless steel sintered felt / woven mesh |
| Material | Stainless steel (316L) |
| Structure | Hollow tubular, multi‑layer gradient |
| Connection Types | Thread / 222 / 226 / M20*1.5 |
Key Advantages
| Advantage | Description |
|---|---|
| High Filtration Precision | Three‑dimensional porous structure retains ≥95% of particles from 0.1 to 100 μm. |
| Heat & Pressure Resistance | Operates reliably up to 300 °C and 31.7 MPa. |
| Large Dirt‑Holding Capacity | Gradient pore design offers significantly higher capacity than single‑layer felts. |
| Reusable | Can be cleaned and reused, reducing operating costs. |
| Excellent Permeability | High porosity ensures low pressure drop and high flow rates. |
| Corrosion Resistance | 316L stainless steel withstands aggressive polymer melts. |
Working Principle
The cartridge operates on the depth filtration mechanism. Molten polymer flows from the outside inward through multiple layers of metal fibre felt with progressively finer pores. Contaminants – such as solid particles, gels, carbonised residues, unmelted polymers, and metal debris – are trapped layer by layer. The outer layers capture larger particles while inner layers remove finer impurities. This gradient structure delivers a perfect balance of high filtration accuracy and extended service life.
Why Do Nonwoven & Strapping Lines Need Melt Filter Cartridges?
For Nonwoven Production
In spunmelt processes, the melt filter removes impurities to provide clean polymer for spinning. This protects the spinning pump, prevents spinneret blockages, reduces fibre breakage, and extends the life of downstream components. Unfiltered melt leads to defects, downtime, and poor product quality.
For Strapping Band Manufacturing
PET/PP strapping demands tight dimensional tolerances and high mechanical strength. Impurities and bubbles in the melt create visible defects and weaken the band. Precision filtration removes these contaminants, ensuring smooth extrusion and consistent product performance.
Selection Guide
| Line Type | Recommended Model | Remarks |
|---|---|---|
| Small nonwoven or strapping line | D35×L425 | Standard flow, cost‑effective |
| Medium nonwoven line | D35×L485 / D35×L525 | Longer cartridges for extended life |
| Large nonwoven production | D50×L507 | Larger diameter for higher throughput |
| Ultra‑high output line | D60×L507 | Maximum flow capacity |
Ordering Information
To ensure accurate selection, please provide the following details:
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Model: D35×L425 / D35×L485 / D35×L525 / D50×L507 / D60×L507
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Filtration Precision: _____ μm
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Connection Type: Thread / 222 / 226 / other
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Material: 316L or special requirement
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Quantity: _____ pieces
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Application: Nonwoven / Strapping / Other
