Effect of transverse stretching on ptfe waterproof and breathable membrane
The transverse stretching stage is a key step in controlling the microporous structure and thickness of ptfe waterproof and breathable membrane.
During the transverse stretching process, each part of the film along the transverse stretching direction is stretched unevenly, and transverse stretching is an uneven stretching process.
Compared with the two sides of the film, the stretch in the middle part is relatively small. Uneven transverse stretching causes the middle region of the film in the transverse stretching direction to have small pores and low porosity, while the two sides have large pores and porosity.
The difference in microporous structure in the transverse stretching direction of the film will affect the waterproof and moisture-permeable properties of the film and its laminated fabric.
????Fix the longitudinal stretching ratio, stretching temperature and other process conditions, and change the transverse stretching ratio.
As the transverse stretching ratio increases, the film porosity and average pore size increase.
At the same time, fibrils parallel to this direction also appeared in the transverse stretching direction.
After the water vapor condenses into water droplets in the ptfe waterproof and breathable membrane, the particles will become larger. In addition, the surface tension of the water droplets will act, and the water molecules will not be able to smoothly leave the water droplets, penetrate and reach the other side, that is, It is said that this process can prevent water penetration and allow the waterproof and breathable membrane to truly have a waterproof function.
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