In the transverse stretching direction of the ptfe biaxially stretched 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? It is also generally higher than the 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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