As discussed earlier, {HEAD ~ the glass sheet} 10 must also be heated to relieve any internal stresses resulting from the concentrated heat and prevent {TAIL ~ thermal fracturing} of the glass 
heated to prevent
As discussed earlier , { HEAD ~ the glass sheet } 10 must also be heated to relieve any internal stresses resulting from the concentrated heat and prevent { TAIL ~ thermal fracturing } of the glass
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH