PTFE waterproof breathable membrane stretch characteristics

Today I would like to introduce a new type of material to you, which is the ptfe waterproof and breathable membrane produced and developed by the company.

Let’s take a closer look below.

PTFE waterproof and breathable membrane can easily stretch out fibrils and nodes at a lower temperature (35°C), but when the strain reaches 25%, the base tape breaks and the tensile stress decreases rapidly; the tensile temperature When the tensile temperature is 90°C, the base tape will break when the strain reaches 100%; when the tensile temperature is above 140°C, even when the strain reaches 300%, the base tape will not break.

In actual processing of ptfe waterproof and breathable membrane, the lateral expansion is usually around 170℃.

Under the tensile force, the fibrils are pulled out from the PTFE resin particles. As the force increases, the length of the fibrils increases and the film becomes thinner.

When the fibril becomes no longer extensible, the force is transferred to the middle area of the base tape in turn, and then the middle part of the base tape is stretched.

Therefore, the biaxially stretched film tends to be thin on both sides and thick in the middle.

High temperature stretching is easier than low temperature stretching to make the film thinner.

In the transverse stretching direction of the film, in the area at the same distance from the edge, the pore size of the film stretched at high temperature is generally larger; at the same stretching temperature, the pore size in the area closer to the edge of the film is also generally larger than middle area.

The size and thickness of the film pores correspond to each other. In areas where the film thickness is small, the pores will be larger due to the larger fiber elongation, and vice versa.

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