Because the cavity is pressurized during {HEAD ~ the method} of the present invention, the escaping air prevents {TAIL ~ a burr} from forming internally by pushing the molten material back through the hole 
Because the cavity is pressurized during { HEAD ~ the method } of the present invention , the escaping air prevents { TAIL ~ a burr } from forming internally by pushing the molten material back through the hole
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH