Stephen J Rabinowitz, 81428 Spanish Moss Ln, Richmond Hill, GA 31324

3964534, Jun 22, 1976

Mar 4, 1974

5/448159

Stephen Rabinowitz - Huntington Woods MI

Ford Motor Company - Dearborn MI

B22C 1522
B22D 2900

164 7

A method for preparing sand cored parts is disclosed which is applicable to certain types of molding techniques where the mold cavity is at least slightly porous, such as shell molding, green sand molding, and most importantly, the cavityless method of molding. An impervious ply of highly formable consumable material, such as polyethylene plastic, is inserted or injected by blow molding to form an envelope conforming to the shape of the core box cavity. Unbonded sand is injected into the interior of the plastic ply to totally fill the same while being vibrated; the plastic envelope is then evacuated of air and sealed off to form a discrete package. The sand core, so packaged, is then removed from the core box and positioned within a molding cavity such as the cavity that might be formed in a consumable foam pattern or assembly whereby the complete cycle of casting may be carried out.