PTFE Filter Bags

Description

 

PTFE (polytetrafluoroethylene), also known as Teflon, is a polymer material with excellent properties. This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents. It is also resistant to high temperatures and has an extremely low friction coefficient.

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Feature of PTFE Filter Bags

• Excellent high temperature resistance: Withstands continuous operating temperatures up to 260°C (500°F) and can reach up to 300°C (572°F).
• Excellent acid and alkali resistance: PTFE can withstand almost all chemicals, making it an ideal material for filtering corrosive substances.
• High filtration efficiency: Low coefficient of friction helps prevent particles from sticking and effectively captures fine particles.
• Hydrophobicity: PTFE naturally repels water and other liquids, helping to control humidity in critical applications
• Durable: The service life can reach 6 years under normal operating conditions in the temperature range of 66°C to 204°C.

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Filtration Principle of PTFE Filter Bags

• Physical filtration: PTFE filter bag filters particles with its microporous structure, and its pore size is usually between 0.1 micron and 1 micron. When gas or liquid passes through the filter bag, larger particles will be blocked by the pore size of the filter bag, while smaller particles can pass through the pore size of the filter bag, thus achieving the purpose of filtration.
• Surface filtration: Its porous surface can capture and aggregate particles to form a dense filter layer to prevent smaller particles from passing through. When the filter layer formed in the early stage is thick enough, its filtration effect will be better.
• Inertial interception: Inertial interception refers to the inertia of particles in gas or liquid that prevents them from directly passing through the pore size of the filter bag and being intercepted. When particles flow through the filter bag, the inertial force will cause larger and heavier particles to deviate from the direction of the airflow and be intercepted on the surface of the filter bag.
• Electrostatic adsorption: Due to the charged nature of the surface of the PTFE filter bag, when there are charged fine particles in the gas, they will be adsorbed by the static electricity on the surface of the filter bag, thereby increasing the filtration effect.

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Physical Properties

Air permeability(L/m².s) @200pa	Tensile strength(N/5 cm)		Temperature(℃ / ℉)
	warp	weft	Operating	Ultimate
100~200	1000	1100	260 / 500	300 / 572

Chemical Properties

Acid Resistance	Alkali Resistance	Hydrolytic Resistance	Oxidation Resistance	Abrasion resistance
Excellent	Excellent	Excellent	Excellent	Moderate

Specifications

Heat resistance	Up to 300℃
Fabric	100% PTFE fiber
Length & diameter	No limited
Thickness	1.0-1.8mm
Air permeability	30-80mm
Area weight (g/m²)	700~800
Working lifetime	12000 hours and more
Breaking elongation (%)	(Warp): <40 (Weft): <60
Breaking strength	(Warp): >1350 (Weft): >1450

Surface Treatment of PTFE Filter Bags

There are 2 kinds of treatment : “PTFE film” and “PTFE dipping”

• PTFE film: Improve filtration precision: ≤10mg/m³, but lower the filtration efficiency; and a substantial increase in acid-base resistance property.
• PTFE dipping: Improve filtration precision: ≤25mg/m³, does not lower the filtration efficiency; and a small increase in acid-base resistance property.

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Applications

PTFE filter bags can provide excellent filtering effects in various harsh filtering environments. The application of this material not only improves the filtering efficiency, but also brings more possibilities to industrial production and promotes the progress and development of the industry.

• Chemical Processing: Used in environments where aggressive chemicals are handled.
• Pharmaceuticals: Ensures product purity and compliance with stringent industry standards.
• Food and Beverage: Maintains high standards of hygiene and product quality.
• Mining and Metals: Effective in dust collection systems where high temperatures and corrosive gases are present.
• Waste Incineration: Withstands high temperatures and corrosive gases produced during incineration.
• Cement Plants: Used in kiln and mill processes where temperatures are high.

 

How Filmedia® Improves The Performance of PTFE Filter Bags

• Advanced needle punching technology, cross-laying, the number of layers is controlled between 6 and 8. The frequency of needle punching reaches 21,000 needles/min.
• Thickened PTFE microporous membrane with a porosity of more than 80%, high-precision filtration and breathability.
• The modern professional filter material coating machine can film filter materials of all materials, and the coating is firm and even.
• In order to prevent dust from entering through the suture needle space, the sutures and interfaces are glued and sealed, and the bag body is film-breaking and hot-melted.
• Increase system filtration capacity by 50-150% as needed without major changes to the dust collector.

 

We Pay Attention to Every Processing Detail:

• Accurately design the size of the filter cloth required for the filter bag. The filter cloth will be larger than the actual design size to leave enough operating space.
• Choose the right filter bag accessories and check their quality.
• We draw, cut and sew the filter bags on an automatic production line. When the filter bag needs to be processed manually, we open it on the operating platform and use a certain pulling force to keep it flat.
• We maintain strict processing quality standards in accordance with design drawings and operating procedures. Our workers dress in compliance with safe construction requirements and are prohibited from smoking.