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