| 摘要 |
PURPOSE:To shorten molding hours and obtain a molded product whose external appearance is favorable by a method wherein a liquid epoxy resin composite is injected with pressure into a mold holding coil parts or a transformer and is in a state of low pressure. CONSTITUTION:Coil parts 3 or a transformer is sealed with a liquid epoxy resin 4 composite by injecting the same into a mold holding the coil parts 3, obtained by winding a conductive wire round a bobbin, or the transformer. The liquid epoxy resin composite is obtained by mixing up liquid epoxy resin with a curing agent, an accelerating agent, a filling agent and/or a fire retardant and it is preferable to contain the filling agent up to 70wt.% and further the fire retardant up to 30wt.%. A degree of vacuum within the mold set up at a temperature not exceeding 140 deg.C is made not exceeding 0.6 Torr and it is preferable since bubbles are not left behind when the degree of vacuum within the mold is regulated at 1-5 Torr simultaneously with starting of injection of the liquid epoxy resin composition. |
