The reinforcing frame rib extends around {HEAD ~ the entire casing} for fixing the casing in a predetermined form, whereby {TAIL ~ detrimental deformation} of the casing , when washing the paper pulp at overpressure, is prevented 
The reinforcing frame rib extends around { HEAD ~ the entire casing } for fixing the casing in a predetermined form , whereby { TAIL ~ detrimental deformation } of the casing , when washing the paper pulp at overpressure , is prevented
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH