To put it simply, the core processing technology of ptfe biaxially oriented film is extrusion, calendering, stretching and sintering. A special extruder is used to extrude rod-shaped or strip-shaped polytetrafluoroethylene tapes, which are processed on the calender. It is rolled into very thin sheets, dried to remove the additives, and then biaxially stretched on a stretching machine.
Stretching ratio and stretching temperature have obvious effects on the tensile strength and elongation at break of the film. Compared with unstretched polytetrafluoroethylene tape, the strength of the film is doubled.
The tensile strength of PTFE biaxially stretched membrane increases with the increase of stretching temperature, while the elongation at break of microporous membrane decreases with increase of stretching temperature.
This is because as the stretching temperature increases, the molecular chain mobility becomes higher, the wafer becomes easier to unwind, and the orientation of the microfibers in the film becomes higher.
When the stretching ratio is small, the length of the microfibers is smaller and the orientation is lower. When the stretching ratio is larger, micropores with a more uniform size distribution can be obtained.
Although the degree of microfiber orientation increases, the larger microfiber size causes the microfibers to de-orient during the subsequent heat setting process, thus reducing the strength.
Suzhou New Material Technology Co., Ltd. is a fluorine material film manufacturer that integrates the R&D, production and sales of PTFE air filtration membranes, PTFE bubble point membranes, PTFE biaxially oriented membranes, Teflon films and coated filter materials.
The company has advanced PTFE film production lines, lamination and composite production lines, which are at the domestic advanced level.
The company’s products are widely used in various fields. The company has always implemented the purpose of “quality first, reputation first” to provide users with high-tech, high-quality, high-performance, and high-level products.
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