| 摘要 |
PURPOSE:To obtain a molded form, in which no defective molding is generated and a surface of which is coated excellently with a sheathing material, by arranging a thermosetting material A having slow curing speed to a section near the periphery of a mold and a thermosetting material B having fast curing speed to a section near a center. CONSTITUTION:A plurality of thermosetting materials having different curing speed are disposed in such a manner that the central upper section of a thermosetting material A is hollowed and a thermosetting material B is inserted into an indentation. Or the thermosetting material B having a small area is superposed at approximately a central section on the thermosetting material A having a large area. The thermosetting material B is buried completely at approximately the central section of the thermosetting material A. The thermosetting material A is superposed onto a superposed body. Another thermosetting material C having different curing speed is superposed onto the superposed body. A thermosetting material 10 arranged to a mold is pressed under fixed conditions, the temperature of the mold is elevated to 130-160 deg.C, mold clamping pressure is increased to 70-150kgf/cm<2> and a mold close time is brought to 10-300sec. A sheathing material is injected at high pressure from a filler hole 15 when the curing of the thermosetting material in the mold properly progresses-for example, during a time when the mold is being closed immediately after the peak temperature of heat generation by curing. |
