| 摘要 |
PURPOSE:To fill a gypsum slurry to a matrix having steep slopes and to obtain an excellent roll-over gypsum model by subjecting alternately the matrix surface on which a parting material is coated to adhering of woven fabrics stuck with calcined plaster powder with coating of a gypsum slurry and coating of the gypsum slurry. CONSTITUTION:When the woven fabric 4a stuck preliminarily with the calcined plaster powder is adhered to the matrix surface right after coating of the gypsum slurry, part of the water in the gypsum slurry is absorbed in the calcined plaster powder and therefore the viscosity of the gypsum slurry increases and even if the matrix surface has the steep slopes, the gypsum sticks stably to the matrix surface without drooping. On the other hand, the fabric 4a stuck with the calcined plaster powder is progressed in curing by the moisture absorbed from the gypsum slurry by which the fabric is laminated and integrated to the gypsum slurry. The coating of the gypsum slurry and the adhering of the woven fabric stuck with the calcined plaster powder are further repeated a required number of times. Posts 5 are finally erected at suitable points and the molding is removed from the matrix surface, by which the roll-over gypsum model reinforced with the fabrics 4a, 4b is obtd. |
