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What Are The Production Processes And Applications Of PTFE Film?

Sep 29, 2020

There are two main types of PTFE film: microporous film and turning film. The biggest difference between the two is that the microporous membrane is breathable, which is produced by biaxial stretching; the turned membrane is cut by a lathe, and it is not breathable. Here mainly talk about the microporous membrane.


1. Polytetrafluoroethylene (ptfe) film


It is made of polytetrafluoroethylene resin particles as the raw material, which is expanded and stretched to form a microporous film.


It is also divided into the following types: 1. Air filtration membrane Polytetrafluoroethylene filtration membrane can be used for atmospheric dust removal and air purification When the pore size of the membrane can be controlled at 0.2um, the porosity can reach more than 88%, and it can be combined with needle felt, machine-made cloth, non-woven fabric, glass fiber and other filter materials to obtain a coated filter material with surface filtration performance.


The PTFE coated filter material has the characteristics of high peel strength, large air permeability, and uniform pore size distribution.


As a dust bag or pleated dust filter cartridge installed in the dust removal equipment, it will quickly and effectively trap the ultrafine dust calculated in microns, the dust removal efficiency can reach more than 99.99%, the service life is up to 3 years, and the air permeability can reach 3- 6m/min, is currently the world's most advanced air filter material, the best choice for various vacuum cleaners, air filter elements, air purification equipment, high efficiency air filters, etc.


The technical parameters are as follows:


Thickness: 5um-15um


Air permeability: 80-100L/㎡•s


Width: ≤1800mm


Resistance: ≤80Pa Efficiency: 99.99%



2. Waterproof and moisture permeable microporous membrane


The PTFE waterproof and moisture-permeable microporous membrane is made by a special process and biaxially stretched. The surface of the membrane can reach billions of micropores per square inch, and the diameter of each micropore (0.1um-0.5um) is less than water.


The minimum value of the smallest light mist in the molecule (20um-100un), which is much larger than the molecular diameter of water vapor (0.0003um-0.0004um), which can allow water vapor to pass but water droplets cannot pass.


This kind of microporous structure can achieve excellent Water-proof and moisture-permeable function; in addition, because the holes are extremely small and the longitudinally irregularly curved arrangement, the wind cannot pass through, and it has the characteristics of windproof and good warmth.


The film has been continuously improved since its inception. Special treatment on the PTFE film has greatly improved its firmness and durability.


After being compounded with other fabrics, it is widely used in military clothing, medical clothing, casual clothing, fire protection, and fire protection.


Special protective clothing such as biochemical, anti-virus, and water immersion operations, accessories such as outdoor sportswear, shoes, hats, gloves, and materials such as sleeping bags and tents.


The technical parameters are as follows:


Thickness: 20um-50um


Moisture permeability: 16000g/㎡•24hr


Hydrostatic pressure: 6000mm


UV resistance: 97℅


Width: ≤1700mm


Gram weight: 5-10g/m2



3. Teflon bubble point film


It uses polytetrafluoroethylene (ptfe) as raw material to form a microporous film after expansion and stretching.


This film is laminated on various fabrics and substrates with a special process to become a new filter material. The membrane has a small pore size, about 0.2-0.5μm, uniform distribution and large porosity.


While maintaining air circulation, it can filter all dust particles including bacteria to achieve the purpose of advanced purification and ventilation. It is widely used in pharmaceuticals, Biochemistry, microelectronics and laboratory supplies and other fields.


Technical Parameters:


Thickness width bubble point


30um-50um 1600mm ≥1kg/cm2 (5.3m/s 127Pa)