PURPOSE:To enable production of products of slight-gage materials having various thicknesses by superposing =3 sheets of core materials which are coated with a release agent on the surfaces and are different in thickness, then rolling said stock by using pack rolling process. CONSTITUTION:For examples, the core material is formed of =3 sheets of Ti material and the release agent is coated on the surfaces of the respective Ti sheets to prevent sticking of the Ti to each other and the Ti to a steel sheet by rolling. The top and bottom of the core material 1 are sandwiched by cover materials 2 consisting of steel, etc., and the periphery thereof is enclosed with spacers consisting of the same material as the materials 2. The materials 2 and the spacers 3 are welded over the entire periphery. The atmospheric air or other gas is filled in the pack rolled stock or a vacuum atmosphere is maintained therein. The pack rolled stock cools from the outside in the case of superposing =3 sheets of the core materials having the same size and the same material quality; therefore, the outside core materials 1' among the laminated core materials cool down to the temp. lower than the temp. of the inside core material 1. the inside core is, therefore, finished to the thickness smaller than the thickness of the outside core materials.
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