A diaphragm deflectably spans and sealingly closes the open end of the chamber and urges the pressing roller and {HEAD ~ thus the sheet material} against {TAIL ~ the driven roller} with a force proportionate to the pressure prevailing in the chamber of the housing 
against
A diaphragm deflectably spans and sealingly closes the open end of the chamber and urges the pressing roller and { HEAD ~ thus the sheet material } against { TAIL ~ the driven roller } with a force proportionate to the pressure prevailing in the chamber of the housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD 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 OTH OTH OTH