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In the process of forming a film from a resin, PTFE is subjected to extrusion, biaxial stretching, heat setting, etc., and under different external forces, there are different degrees of dissociation and orientation to cause deformation. Deformation causes changes in the overall structural system of the polymer. The type and size of the change are related to the properties of the polymer and the processing conditions. The influencing factors include molecular weight, initial state of the polymer, stretching temperature, and stretching direction (one-way, two-way, Simultaneously, in sequence, and deformation rate and deformation size. This change directly affects the structure and properties of the film, including orientation distribution, crystallinity, thermal properties, optical properties, film thickness, pore properties, mechanical properties, and anisotropy.