The continuous sheet is directed through a chilling station where it is chilled and firmed such that {HEAD ~ the sheet} maintains {TAIL ~ its extruded cross sectional configuration} 
maintains
The continuous sheet is directed through a chilling station where it is chilled and firmed such that { HEAD ~ the sheet } maintains { TAIL ~ its extruded cross sectional configuration }
OTH OTH OTH OTH OTH 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 TAIL TAIL