The technology of waterproof and breathable membranes was first introduced from European and American countries. However, the production processes of domestic products are diverse, and the quality of products from various manufacturers is uneven, failing to form a unified quality standard.
In fact, waterproof and breathable membranes mainly consist of three layers: PP spunbond non-woven fabric, PE polymer breathable membrane, and PP spunbond non-woven fabric.
The main function of spunbond non-woven fabrics is to enhance tensile force and hydrostatic pressure and protect the middle layer (breathable film). Real breathability mainly relies on the middle layer PE polymer breathable film.
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