| abstract |
The invention relates to a PTFE filter felt and a production process thereof, comprising the following steps: selecting PTFE short fibers and PVA short fibers, and uniformly mixing the two in proportion; adopting a production line of double-spread double-comb nonwoven needle-punched filter felt, The mixed fibers are opened and combed into a web; the PTFE filament base cloth is laid in advance, and the upper and lower surfaces are cross-laid; Thorn reinforcement; remove PVA short fibers from the pre-punched felt by weight reduction method; re-puncture the felt after removing PVA short fibers to form plain felt; heat-setting and singeing the plain felt; calendering treatment. The invention can shorten the process flow, increase the production speed, increase the production capacity, reduce the production cost and ensure the filtering effect of the filter felt. |