What are the methods for manufacturing the microporous structure of waterproof and breathable membranes?

Biaxial stretching method: When polytetrafluoroethylene (PTFE) is rapidly stretched, it becomes a strong, waterproof, breathable microporous material, which is the main component of GORE-TEX membrane. During the stretching process, the PTFE material has stable properties and is difficult to prepare and shape using conventional methods. However, the biaxial stretching method can be used to prepare the material.

Multi-directional stretching high-temperature sintering method: This is the preparation method of expanded polytetrafluoroethylene microporous waterproof and breathable membrane. By mixing PTFE raw materials and extrusion aids in a certain proportion using a self-made multi-directional tensile apparatus, and going through the process of molding with a flat vulcanizer, double-roller calendering, drying, stretching, sintering, and cooling, a white, soft and very rich product can be prepared. Good elasticity eptfe expanded polytetrafluoroethylene microporous waterproof and breathable membrane.

Laser drilling method: The process of drilling holes using high-power density laser beams. Advanced laser technology can drill holes without burrs, and all apertures are uniform. The advantages of this method are that there are no burrs, it is convenient to adjust the hole diameter and hole spacing, it is simple to operate, and it can avoid the impact of mold loss during long-term use, ensuring that the accuracy of each round hole is at the um level.