Upon {HEAD ~ completion} of {TAIL ~ foaming} and cross linking, the article is expanded while warm and cooled in the expanded state 
of
Upon { HEAD ~ completion } of { TAIL ~ foaming } and cross linking , the article is expanded while warm and cooled in the expanded state
OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH