Sewing Threads for Filter Bag Production
Premium Sewing Threads for Industrial Filter Bag Manufacturing
Description
High-Performance Sewing Threads for Filter Bag Manufacturing
PTFE, PPS, Meta-Aramid & More — Designed for Industrial Filtration Systems
Our industrial-grade sewing threads are engineered to meet the toughest demands in dust collection and filtration systems. Offering exceptional strength, durability, and resistance to heat and chemicals, they are ideal for sewing filter bags used in cement plants, steel mills, power stations, and chemical industries.
Split-Film PTFE Thread – Built for High-Speed Automatic Sewing
At Ningbo Trans Envirotech, we supply split-film PTFE sewing thread purpose-built for automatic filter bag production lines. With breaking strength up to 68N and stable performance at speeds of 10–12 meters per minute, this thread is the best solution for high-temperature filter media like PPS, PTFE, fiberglass, and aramid.
✅ Key Advantages:
- High strength and flexibility for automated sewing
- Smooth surface, low friction – no skipped stitches or thread breaks
- Leak-proof seams, even under reverse pulse cleaning
- Excellent resistance to heat (up to 260°C) and chemicals
- Long service life, fewer production interruptions
What Is Split-Film PTFE Thread?
Unlike traditional extruded PTFE thread, split-film PTFE is made by:
- Casting high-purity PTFE resin into thin films
- Mechanically splitting the film into microfibers
- Twisting them into soft, strong multi-filament thread
This results in superior softness, tensile strength, and machine compatibility — ideal for high-speed sewing of advanced filter bags.
Extruded vs. Split-Film PTFE Thread – Structural Comparison
🔹 Extruded PTFE Thread
Process:
PTFE resin → extrusion → stretching → drying → cutting or twisting
Structure:
- Monofilament
Thick, stiff, and hard to form consistent stitches; rarely used in sewing - Multifilament
More flexible, but surface tends to be rough, with high friction
✅ Most extruded PTFE threads in the market are multifilament,
but they often suffer from thread breakage, skipped stitches, and poor compatibility with automatic sewing machines.
🔹 Split-Film PTFE Thread
Process:
PTFE film → mechanical splitting → microfibers → multi-filament twisting
✅ Always multifilament – cannot be monofilament.
Its structure resembles traditional textile fibers (like PPS or aramid), making it ideal for high-speed automated filter bag sewing.
📌 Summary:
Split-film PTFE thread offers higher softness, lower friction, and superior compatibility with automated sewing lines, outperforming conventional extruded threads in every key metric.
Split-Film vs Extruded PTFE Thread – Technical Comparison
| Parameter | Split-Film PTFE Thread | Extruded PTFE Thread |
|---|---|---|
| Structure Type | Multifilament only | Mono- or multifilament |
| Softness | ✅ High | ❌ Low |
| Surface Friction | ✅ Smooth | ❌ Rough |
| Suitable Sewing Speed | ✅ 10–12 m/min | ❌ ≤5 m/min |
| Breaking Strength | ✅ Up to 68N | ❌ 25–30N |
| Stitching Stability | ✅ Consistent | ❌ Prone to breaks/skips |
✔️ Recommended for automated sewing of high-temperature filter bags.
Sewing Thread Product Range Overview
| Thread Type | Temperature Resistance | Breaking Strength | Key Features |
|---|---|---|---|
| High-Tenacity Polyester | ≤150°C | ≥60N ±5% | Strong, abrasion-resistant |
| High-Tenacity Polyethylene | ≤100°C | ≥55N ±5% | Lightweight, chemical-resistant |
| Split-Film PTFE | ≤260°C | ≥68N ±5% | Heat & chemical resistant, smooth sewing |
| Acrylic Thread | ≤280°C | ≥25N ±5% | Chemically stable, good heat resistance |
| PPS Thread | ≤190°C | ≥25N ±5% | Hydrolysis- and oxidation-resistant |
| Meta-Aramid Thread | ≤200°C | ≥25N ±5% | High strength and thermal stability |
| Fiberglass Thread | ≤280°C | ≥25N ±5% | Excellent high-temp performance |
Industry Applications
Our sewing threads are trusted in a wide range of demanding filtration environments:
- Dust Collector Bags – Cement kilns, steel plants, incinerators
- Filter Press Cloths – Used in chemical, pharmaceutical, and food industries
- High-Temperature Filtration – Power plants, asphalt mixing plants, metal smelters
- Liquid Filter Bags – Compatible with both sewn and welded bags
Contact Us for Samples & Technical Support
If you’re looking for high-performance threads for automated sewing of filter bags, we’re here to help.