A highly breathable coating amount of the nonwoven fabric filter, their preparation and their use in the coating apparatus

The present invention discloses a high air permeability of the nonwoven fabric covered media, their preparation and their use in the coating apparatus. High air permeability of the nonwoven fabric covered media, comprising a nonwoven fabric substrate and a microporous PTFE membrane, a nonwoven fabric base material has a bump, a microporous PTFE membrane composite in bumps. Production of high air permeability of the nonwoven fabric membrane filter media, non-woven fabric base material from the convex surface, and from the convex surface of the PTFE microporous film gap Hot Press, i.e., too. The present invention effectively solves low permeability membrane filter media, severe membrane damage, short service life; high air permeability of the nonwoven fabric of the present invention is high permeability membrane filter media, process air volume, long life with higher flexural properties; preparation method of the present invention is simple, and significantly reduce damage to the film; film device structure of the present invention is simple, easy to use, easy to control.