Such an unstable sheath in a working width of any length is then pulled onto a stable screen drum 11 to which a coarse screen fabric 12 has already been applied to provide a space between {HEAD ~ wall} 5 and {TAIL ~ screen drum} 11 
Such an unstable sheath in a working width of any length is then pulled onto a stable screen drum 11 to which a coarse screen fabric 12 has already been applied to provide a space between { HEAD ~ wall } 5 and { TAIL ~ screen drum } 11
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH