To execute direct production at a high yield by packing a metal granular material into a metallic tube, pressurizing this and deforming the metallic tube into a sheet shape together with the packed material.
A metal granular material F is packed into a metallic tube 3 with a circular shape in the cross-section, which is rolled by forming rolls 7 and the metallic tube 3 is deformed into a thick plate or a thin sheet shape together with the packed material 6 in plural stages. Then, at a guide roll 8, a metallic tube 5 formed into a thin sheet shape is separated from a green sheet material A and is removed. The rolling by the forming rolls 7 can be executed together with the metallic tube 3 to a desired thickness but the outer circumferences of the both side parts crushed into the sheet shape of the packed material 6 to a final thickness are constrained by the crushed metallic tube 3. Thus, this part can not freely stretch, in a stretching way similar to that in the center part, the peripheral parts also stretch to form into a green sheet material A having an approximately uniform thickness over the whole width and cracks are not generated in the side edge parts.
CHIYOU TOU
YAMAJI KENKICHI
KATO YOJI
SAKURADA HISASHI
KAGA HISASHI
NIPPON SOZAI KK
YAMAJI KENKICHI
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