The synthetic fibers thus function as {TAIL ~ a reinforcing web} or backbone to maintain some mechanical integrity and {HEAD ~ strength} of the paper 
The synthetic fibers thus function as { TAIL ~ a reinforcing web } or backbone to maintain some mechanical integrity and { HEAD ~ strength } of the paper
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH