Patent ID: 8034265

Claim:
A molding process for molding a mold using a dry mixture of an aggregate material prepared by the steps of: mixing aggregate materials, one or more kind of a water-soluble binder that is soluble by water at ambient temperatures, and water, to make a mixture; and evaporating the moisture within said mixture during said mixing step such that said mixture is dried and has single-grain structures; and wherein additional water is added to said dry mixture to form a molding material for molding a mold with said dry mixture, wherein said additional water has a normal temperature, and wherein said dry mixture has an ambient temperature, said process comprising the steps of: freezing said dry mixture with said additional water such that said single-grain structures in the mixture are maintained; charging said frozen mixture into a molding space; evaporating the moisture within said charged mixture to cure said charged mixture to mold a mold with said cured mixture; and removing said molded mold from said molding space.