How about TPU composite fabric
What about TPU composite fabric
The difference between TPU composite fabrics and PTFE composite fabrics. Many jackets use PU and TPU composite fabrics/cloth materials. They are also waterproof and breathable, but in the actual outdoor environment there is a big difference with the E-PTFE composite fabric/cloth materials used by GoreTex. different.
The difference between E-PTFE composite fabric/cloth, TPU composite fabric/fabric, and PU composite fabric/fabric:
At present, some fakes and defective goods of famous brands and some clothes claiming to be waterproof and breathable in the domestic outdoor products market are marked with GOER-TEX. In fact, they mainly use PU composite fabrics/fabrics and TPU composite fabrics/fabrics. Only those products from foreign regular channels (marked with GOER-TEX) and domestic products (marked with DENTIK) use E-PTFE microporous membranes.
Judging from the test data, the current test standards mainly include American ASTME96BW (7 types) and Japan’s JIS1092B (6 types). TPU can achieve: water vapor transmission rate 5800g/m2/day, static water pressure 10000mmH2O, this data and E-PTFE is almost the same, but this test is conducted at normal temperature and static conditions. Moisture conduction is greatly affected by temperature, humidity and air pressure. TPU composite fabric/cloth and static temperature between 20 degrees and 30 degrees PTFE composite fabrics/fabrics are equivalent, but under dynamic conditions, with heavy exercise and increased sweating, TPU moisture conduction is limited, and it is too late to spit out when full. In low temperature conditions, the lower the temperature, the greater the difference. As the temperature drops, TPU composite The molecular mobility of the fabric/cloth decreases and shrinks. At 0 degrees Celsius, the moisture conductivity of the TPU composite fabric/cloth decreases exponentially. It is almost zero below 0 degrees Celsius. It becomes brittle and easy to break when it reaches minus 15 degrees Celsius. If boiling water is poured directly on it E-PTFE will deform when the temperature is high, but E-PTFE will not change at temperatures between minus 150 degrees and 300 degrees. Its moisture conduction capacity remains unchanged, and it can discharge water vapor faster, keeping you dry and comfortable. It also has strong corrosion resistance, strong acid and alkali resistance, and can protect against toxic chemicals. The micropores of E-PTFE are not a straight channel, but the channels form a network structure in the membrane, and wind cannot pass directly. When encountering obstacles, it changes direction and folds back to achieve windproof effect and at the same time keep warm. Therefore, E-PTFE composite fabric/cloth is an ideal material for use in harsh environments. Boil a pot of water and cover it with cloth. It is e-ptfe that can clearly and continuously see water vapor, not the glass on top. You can see water vapor on the glass because TPU composite fabric/cloth has a certain Breathable function, TPU is now made very thin, but in the actual outdoor environment, it is very different from the E-PTFE composite fabric/cloth material used by GoreTex.
Hot melt adhesive film mainly exists in two forms, namely hot melt adhesive film and hot melt adhesive web film, and their uses and properties are different.
Hot melt adhesive film:
Hot-melt adhesive film is made by melting hot-melt adhesive into a paper shape. It is seamless and has good waterproof properties. Although hot-melt mesh film is also paper-like, it has gaps in the middle, similar to “silk” connection, so the breathability of the hot-melt mesh is better.
Based on the above situation, it is conceivable that the stiffness of the hot melt adhesive film will have a great impact on the hardness of the cloth (or other materials) after bonding. It is not very tight, and its impact on the fabric is slightly smaller than that of film.
Hot melt adhesive film:
The manufacturing process of hot melt adhesive film and omentum are different. Under the same size, the weight of the omentum will be lighter because the omentum is not very tightly connected, while the hot melt adhesive film will be heavier.
4. Differences in viscosity
Based on the above situation, it is not difficult to see that the viscosity of the film is greater than that of the omentum. The hot-melt film adheres more firmly and has higher peeling strength. Therefore, when the air permeability requirements are not very high, hot-melt adhesive films are mainly used. For bonding applications, hot-melt mesh is mainly used for those with higher requirements on hand feel and breathability. mJQeb3td
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