Patent ID: 6932144

Claim:
A method of lining riser openings in a graphite mold comprising the steps of: providing a graphite mold cope section having a plurality of riser openings, each of the riser openings having an inner surface, inverting the cope section such that a top of each riser opening faces downwardly, and that a bottom of each riser opening faces upwardly, inserting a mandrel into the upwardly facing bottom of each riser opening, the mandrel having an outer surface and each riser opening having an inner surface and sealing the downwardly facing top of each riser opening, placing a vented plate assembly adjacent the upwardly facing bottom of each riser opening in the cope section, injecting an insulating material through the vented plate assembly between the outer surface of the mandrel and the inner surface of each riser opening, and injecting a curing agent to contact the insulating material to form a layer of cured insulating material on the inner surface of each riser opening.