A plug is used in the thermoforming process to contact the sheet and position {HEAD ~ the sheet} within {TAIL ~ a die} 
within
A plug is used in the thermoforming process to contact the sheet and position { HEAD ~ the sheet } within { TAIL ~ a die }
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