{HEAD ~ A supported membrane} is a membrane cast on {TAIL ~ a substrate}, preferably a nonwoven fabric 
{ HEAD ~ A supported membrane } is a membrane cast on { TAIL ~ a substrate } , preferably a nonwoven fabric
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH