Production process of waterproof and breathable membrane

1. Casting compound. This process uses plastic particles to heat-melt and relies on the viscosity of the plastic itself. The disadvantage is that it is hardly breathable. In 2014, there is no way around the world to use this process to produce real high-permeability, high-temperature, waterproof and breathable membranes.

2. Spray glue or squeegee compound (hot melt glue compound). 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 permeability is relatively low, because the micropores of the waterproof and breathable membrane in the middle 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). A simple example is that in winter, the double-sided tape is almost non-sticky and will delaminate, but in summer, the glue on the surface of the double-sided tape will melt.