The bladder expends while applying {HEAD ~ a pressure} on {TAIL ~ the thermoplastic sheet} against the wall from the bottom portion to the top portion 
on
The bladder expends while applying { HEAD ~ a pressure } on { TAIL ~ the thermoplastic sheet } against the wall from the bottom portion to the top portion
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH