Process of waterproof and breathable membrane

(1) Cast compounding. This process relies on the viscous compounding of the plastic itself after thermal melting of plastic particles. The disadvantage is that it is hardly breathable. In 2014, there was no way around the world to use this process to produce a real high-breathability, high-temperature-resistant, waterproof and breathable membrane.
(2) Glue spraying or squeegee compounding (hot melt compounding). This process was first applied to sanitary napkins, diapers, and protective clothing. Almost all domestic manufacturers use this process to produce highly breathable waterproof and breathable materials. The disadvantage is that the air flow is relatively low, because the micropores in the middle air-permeable membrane are actually blocked by hot melt adhesive. In addition, the most fatal disadvantage is that the temperature resistance is very low, and it can only withstand a temperature of 60 degrees. Because this glue is actually a pressure-sensitive adhesive (self-adhesive). Simple example is exactly when winter, double-sided tape does not have viscosity almost, can delaminate, but to summer, the glue on double-sided tape surface can melt. The quality of the waterproof and breathable membrane made by this process can be imagined. During construction, as long as there is a certain temperature, the non-woven fabric will be glued and layered. Which construction company can guarantee that the roof will be built as soon as the waterproof and breathable membrane is laid during construction? Therefore, this waterproof and breathable membrane can only be a fake and shoddy product of a real waterproof and breathable membrane, and there is no market at all in European and American countries.
(3), hot pressing compound. The domestic market is mixed, and there are actually very few manufacturers that produce real waterproof and breathable membranes. Many factories or sellers say that their waterproof and breathable membranes are good. Almost most users have never thought that the waterproof and breathable membranes provided by some manufacturers are not waterproof at all. For example, one of our domestic counterparts deceived consumers into saying that it was an international company that used the technology and research and development achievements of a well-known international company. In fact, the hydrostatic pressure of the waterproof and breathable membrane they produced was only about 750px, but users did not know how to detect it. I only know that water is poured on the waterproof and breathable membrane, and the membrane is not leaking. In fact, users do not know that water is under pressure and will penetrate. hide. In fact, the real waterproof and breathable membrane should be highly breathable, high temperature resistant, anti-aging, and the hydrostatic pressure should reach more than 2 meters. The production process should be pure thermal compound technology, without glue, so it can reach a temperature resistance of more than 110 degrees, high strength and anti-aging. This is a domestic product that can truly meet the EU standard and is the latest domestic technology.