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Under the tensile force of the PTFE biaxially stretched film, 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 sequence, and then the middle part of the base tape is stretched.
Therefore, the biaxially stretched PTFE film shows a tendency of being thin on both sides and thick in the middle.
PTFE biaxially stretched film 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; Stretching When the temperature is 90°C, the base tape breaks when the strain reaches 100%; when the tensile temperature is above 140°C, the base tape does not break even when the strain reaches 300%.
In actual processing of ptfe biaxially oriented film, the transverse expansion is usually around 170°C.
Suzhou New Material Technology Co., Ltd. is a high-tech enterprise specializing in the research, development and production of fluorine material film technology. The company adheres to the quality policy of “keep improving and striving for excellence” and continues to innovate in product development and production to ensure Its unique stable performance occupies a dominant position in the market.
The biaxial stretching process of our ptfe microporous membrane can make the film have good void characteristics. After the film is stretched in different directions, the structure of the micropores and agglomeration of the film changes, and at the same time the mechanical properties of the film are improved. Performance has anisotropic characteristics.
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