Waterproof breathable fabric
Waterproof breathable fabric
Waterproof breathable fabric is a new type of textile fabric. Its composition is composed of polymer waterproof breathable material (PTFE film) and fabric. It is widely used in outdoor clothing, mountaineering clothing, windbreaker, raincoat, shoes, hats and gloves, cold jacket, sports goods, medical equipment and so on, and is gradually applied to fashion clothing.
Chinese name waterproof breathable fabric
Composition of Polymer Waterproof and Breathable Materials
Function waterproof, moisture permeability, air permeability, insulation
The working principle is that the water particles are very small in the state of water vapor.
Brief introduction of fabrics
The main functions of waterproof and breathable fabrics are waterproof, moisture permeability, air permeability, insulation and warmth preservation. Its moisture permeability is 16,000 g per square metre every 24 hours, waterproof pressure can reach 8,000-20,000 mm water column, insulation can reach up to 100,000 volts. The fabric can also maintain its best efficacy in harsh environments and can adapt to temperatures ranging from 427 degrees to 200 degrees below zero. In terms of manufacturing technology, the technical requirements of waterproof and breathable fabrics are much higher than those of ordinary waterproof fabrics, and in terms of quality, waterproof and breathable fabrics also have functional characteristics that other waterproof fabrics do not have. Waterproof breathable fabrics can enhance the air tightness and water tightness of the fabric, at the same time, its unique vapor permeability can make the water vapor inside the structure expel quickly, avoid the structure breeding mildew, and keep the human body dry all the time. It perfectly solves the problems of ventilation and windproof, waterproof and warmth preservation. It is a new type of healthy and environmental protection fabrics.
Under the condition of water vapor, water particles are very small. According to the principle of capillary movement, water particles can penetrate into the capillary to the other side smoothly, thus the phenomenon of vapor permeation occurs. When water vapor condenses into water droplets, the particles become larger. Because of the surface tension of water droplets (water molecules are “pulling and competing” with each other), water molecules can not escape from the water droplets and penetrate to the other side smoothly, that is to say, water penetration is prevented, so that the permeable film has the function of waterproof.
Water-resistant and waterproof are the main types of waterproof cloth, the former is divided into two types: fiber/cloth (not windproof but good air permeability) and permeable film (windproof but poor air permeability); the latter is generally permeable film type, two or three layers, windproof, two layers are softer than three layers, and the permeability is better than three layers. Stronger. Water-resistant or high-lywater repellent cloth can seep when applied under pressure, for example, when you sit on a wet stool wearing pants of this material.
The development of waterproof began in the late 1970s. Now the products of the 2nd generation are completely waterproof and wind-proof and maintain good air permeability. However, garments made of this material are not necessarily completely waterproof, mainly because of the seepage in the seams or zippers. To ensure that garments are completely waterproof, it is necessary to press glue at all seams (good garments use waterproof strips). This requires a lot of labor and cost, which is why such clothes are so expensive. One of.
1. Control cup method
1.1 Water vapor permeation method
1.1.1 positive cup method
A, China National Standard: GB/T12704-91B
B. ASTME96 Produce BandD
C. Japanese Industrial Standard: JISL-1099A2
D, Canadian Standard: (CGSB) – 4.2No.49-99
E, British Standard: BS7209-1990
1.1.2 pouring cup method (also called hygroscopicity method)
A. ASTM E96BW (1995 and 2000 editions)
1.2 desiccant method
1.2.1 positive cup method
A, China National Standard: GB/T12704-91A
B, Japanese Industrial Standard: JISL-1099A1
C, ASTME-96A, C, E
1.2.2 pouring cup method
A, Japanese Industrial Standards: JISL-1099B1, B2
C. Belgian UCB Standard: UCB Method
D, British Standard: B.T.T.G
2. Sweating hot plate method, also known as skin model method
A, ISO standard: ISO11092
B. Fire protection clothing test: NFPA1971
C. ASTM F1868-98B
D, German Standard: DIN54010T01-A
3. Sweating Dummy Law
Sweating dummy is somewhat like a hot dish, used to simulate the shape and size of a typical human body. Dummy test is more practical than Sweating Hot disk test, because it can consider more variables, including the surface area of clothing covering the human body, the number of layers of textiles and the distribution of air layer on the human body surface, loose or tight fit, skin temperature difference of different parts of the human body, body position and movement state, etc. However, no sweating dummy can be tested yet.
The test cost is higher than that of the hot disk method.
4. Other methods
A, Watkins method
B. Mernander Method