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