Effect of stretching temperature on ptfe waterproof and breathable membrane

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 above 140°C, the base tape will not break even when the strain reaches 300%.

In the 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 transmitted to the middle area of the base tape in turn, and then the middle part of the base tape is stretched.

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

High-temperature stretching makes the film thinner more easily than low-temperature stretching.

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

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

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