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How to achieve the Moisture permeability?
2019/04/18
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Moisture permeability is achieved by laminating waterproof and moisture permeable membranes and PTFE films.
The water vapor molecule is 0.0004 microns in diameter, and the diameter of the rain water mist minimum diameter of 20 microns, the diameter of the drizzle has been as high as 400 microns, if can make the film pore diameters between water vapor and rain, so both waterproof and moisture can not be achieved? GORE, Inc., became the first company to make the film by using polytetrafluoroethylene (PTFE), which was laminated and laminated with a product called GORE-TEX. But because PTFE has very strong chemical inertness, there is hardly any material that can be well laminated with other fabrics, and the first generation fabrics have very poor fastness. Later, through continuous efforts, through other hydrophilic film layer together into a composite film, and in the membrane for special treatment, fastness greatly improved. Generally, Gore-Tex fabric pressure can reach 10000mm, washed 6-7 times pressure was decreased significantly; the moisture quantity can reach 10000g/sqm*24hrs, but this is not just out of the fabric can reach this value, need to go through a few times of washing, the washing part of glue, the available pore increased, moisture permeability increased.
PTFE fabrics are now mainly represented by Gore and Donaldson in the United states. Gore manufactures films and makes composite films. They don't sell films separately. They designate good clothing manufacturers to make clothing, and there are individual salespeople who work with them. Donaldson manufactures only films and makes composite compounds in japan. The competition between the two companies in the market is also very fierce. Domestic PTFE manufacturers are now gradually emerging, but they are based on a single component PTFE film, and no hydrophilic film composite, washing fastness generally only about five times. Last time, at an industrial fabric exhibition in Shanghai, I met an Indonesian manufacturer who allegedly washed about five times.
Although PTFE fabric waterproof breathable performance than other fabrics but also because of its excellent, the province's chemical inertness, film is difficult to be natural degradation, high combustion temperature up to 405 DEG C, large-scale application makes GORE-TEX gradually become environmental killer. Faced with such a difficult situation, GORE has established an abandoned clothing recycling mechanism known as the balanced project to reduce its environmental impact. Hope to protect the environment.
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