The principle of PTFE three-layer composite fabric, the function and use of PTFE three-layer composite fabric

The principle of PTFE three-layer composite fabric, the function and use of PTFE three-layer composite fabric, the technical indicators of PTFE three-layer composite fabric

Using special technology and equipment, it is made of three layers of 100% pure polyester thickened high-strength non-woven fabric and polytetrafluoroethylene (PTFE) microporous film. It has the functions of blocking viruses, antibacterial, anti-static, anti-blood penetration, waterproof and breathable. It has many functions such as moisture resistance, wind resistance, and warmth retention, and is comfortable and lightweight to wear. The anti-microparticle transmission rate is over 90%, making it impossible for viruses and bacteria to pass through.

Uses of PTFE three-layer composite fabric
◎ Nuclear, biological and chemical protection materials
Protective materials to protect against toxic chemicals usually consist of multiple layers of fabrics, including “gas resistance layer” fabrics that adsorb, absorb, detoxify or react with toxic gases, and “liquid resistance layer” fabrics that prevent harmful liquids from contacting the human body. The former is generally breathable , the latter has two types: breathable and non-breathable depending on the fabric used. When using stain-repellent finishing fabrics, although the fabric is breathable, aerosols and microparticles will pass through the fabric, and special objects will pass through under very small pressure, so the protective effect is poor; when using anti-fouling fabrics, not only aerosols and microparticles will pass through the fabric, but they will also be very small. Pressure will cause liquid to pass through, so the protective effect is poor; when using non-breathable coated fabric, the user will feel uncomfortable because water vapor cannot be discharged. PTFE composite membrane has the characteristics of selective water vapor permeability and can be used as a nuclear, biological and chemical protection material. This kind of protective clothing can have multiple functions such as waterproof, moisture-permeable, windproof, nuclear, biological and chemical protection at the same time. Traditional thermal underwear is made of polyethylene or polypropylene film and batt felt. This type of film is completely airtight and cannot drain sweat from the body. The three-layer fabric of knitted fabric and non-woven fabric of PTFE film can be used in thermal underwear. The underwear has the advantages of moisture permeability, windproof, and warmth retention.
◎ All-weather sportswear
PTFE three-layer fabric has waterproof, breathable, windproof and other functions, which greatly improves the wearing comfort and functionality of sportswear.
◎Special clothing
Used in medical staff’s work clothes, it can effectively prevent contamination by body fluids. Flame-retardant clothing can be made with three layers of flame-retardant fabrics.
◎ Shoe materials
The fabric or other porous outer material is bonded to the PTFE film and its microporous structure is maintained to obtain a waterproof and breathable upper. Standard testing found that the upper’s moisture vapor permeability is eight to ten times that of conventional coated waterproof uppers. This kind of upper can also use different fabrics, structures, colors, etc. according to needs. It can give the shoes the following functions: waterproof, moisture permeability, windproof, particle barrier, antibacterial, etc. In addition, the lining composed of PTFE membrane can also be joined with leather to make various waterproof leather shoes (boots) with beautiful appearance. Therefore, PTFE three-layer fabric can be widely used in many aspects such as military shoes, civilian shoes, fashion shoes (boots), etc.
◎Filter materials
The porosity of PTFE membrane is as high as 80%, with an average pore diameter of 0.2mm. It has dimensional stability, chemical resistance and high and low temperature resistance, making it occupy an important position in the application field of filter materials. PTFE membrane filter material has been widely used in flue filtration and hot air filtration in chemical plants, power plants, carbon black plants, cement plants, spray paint plants, etc. It can remove dust, resist the chemical erosion of smoke, and can recycle valuable materials. The membrane can also be used for filtration of certain liquids. Others
PTFE three-layer fabric is currently the best waterproof and breathable fabric in the world in all aspects. Judging from foreign development, it has been used in military protective clothing, tents, mountaineering clothing, space suits, all-weather sportswear, gloves, medical surgical clothing, etc. in extremely cold areas.

Technical indicators of PTFE three-layer composite fabric
1. Moisture permeability ≥12000g.m2.24h, moisture permeability (washed 50 times) ≥12000g.m2.24h (tested according to the dry cup method in GB/T12704-91)
2. Water pressure resistance ≥10m, water pressure resistance (washed 50 times) ≥5m (tested according to GB4744-84)
3. Air permeability ≤3×10-3 m3/(m2.s), air permeability (washed 50 times) ≤3×10-3 m3/(m2.s) (tested according to GB5455-85)
4. Peel strength ≥5.0N/2.5cm, peel strength (washed 50 times) ≥5.0N/2.5cm (tested according to GB11042-89)
5. Thickness 5-80mm
6. Thickness unevenness ≤20%
7. Large width ≥1600mm
8. Tensile strength ≥25N/mm2
9. Elongation at break ≤100%

Notes on PTFE three-layer composite fabric:
The fabric is divided into two-layer composite fabric and three-layer composite fabric. The two-layer composite fabric is made of outer fabric and TPU, PTFE film. The outer fabric is made of polyester, nylon or nylon-poly blended fabric, which is soft to the touch, wear-resistant, tear-proof, has good color and excellent waterproof , breathable, windproof effect, long durability. The surface of the fabric is treated with Teflon water-repellent treatment. When using second-layer fabrics to make garments, you need to hang a lining, or use a fleece thermal layer as a jacket. The three-layer fabric is made of outer fabric, TPU, PTFE film, and inner warp-knitted mesh. There is no need to hang the lining when making a ready-to-wear garment. The outer fabric is made of polyester, nylon or nylon-poly blended fabric, which has a light and thin feel, is tear-resistant, wear-resistant, has good color, has excellent waterproof and windproof effects, better breathability and long durability. The surface of the fabric is treated with Teflon water-repellent treatment. Technical performance of two-layer composite fabric: Technical performance of three-layer composite fabric: Water pressure resistance >10000mm Water pressure resistance >10000mm Moisture permeability >5000g/m2.24h Moisture permeability >6000g/m2.24h Windproof >100% Windproof >100% Scope of application: skiing, cycling, backpacking, mountaineering, golf, casual wear, etc. Scope of application: skiing, cycling, backpacking, mountain climbing, etc.

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