| 摘要 |
PURPOSE:To enable to mold a bubbleless synthetic resin block, by injecting molten resin into a mold, which is covered with a heat insulating material and heated beforehand, through a pouring hole of the bottom part of the mold by an extruding machine. CONSTITUTION:Molten resin 15 is poured through a pouring hole 7 of the bottom of a simple mold 1 preheated by a nichrome wire heater by an extruding machine 14. The simple mold 1 is put into a case made of plywood which is in about 90mm thick. A for the simple mold 1 heat retaining properties of heating by the nichrome wire heater 3 fitted to a top and bottom side plates 2 and the temperature of the resin poured are kept on by a case made of short fiber glass wool 8 and the plywood put between ribs and the resin is extended over up to the top without being cured. After pouring of the resin has been completed, the same is heated by the nichrome wire heater of the upper side plate for 20-30min. After the mold 1 has been left for appropriate hours of more than 24hr as it is, the simple mold 1 is taken out of the case made of the plywood and a resin block is taken out. As for the resin block taken out, one, which is foamless, possesses a uniform thickness and is warpless, can be obtained. |
