The polytetrafluoroethylene composite membrane has a microporous structure with staggered fibers, which is formed by biaxial stretching. It is prepared through high-temperature heat setting process and has a very stable microporous structure.
Too little glue amount will also lead to poor peel strength of the composite film. If the ink on the printed matter is falsely dry, large-area transfer of printing ink will occur after lamination, such as PET (polyester) film/PE film. The transfer of printing ink to the composite inner film often occurs, which is a typical phenomenon of the latter. In very rare cases, the composite film’s fastness is good in areas where there is ink, but the peel strength of the composite film in non-printed areas is poor. This may be caused by too much residual solvent from printing.
The filtration principle of polytetrafluoroethylene composite membrane is completely different from the depth filtration of ordinary uncoated filter materials. Its filtration principle belongs to surface filtration. The filter medium is a PTFE microporous membrane with high efficiency interception capability. This PTFE microporous membrane is pressed onto a special base material, and the selection of the base material should be consistent with the mechanical, temperature, and chemical requirements of the system. The working temperature is 260 degrees Celsius, and the highest instantaneous temperature is 285 degrees Celsius.
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