| 摘要 |
PURPOSE:To manufacture a foamed product of uniform hardness by providing a communicating component of foamed shape with a number of communicating paths on an open section of an insert, injecting foamed resin through communication components, impregnating the communicating components with foamed resin at the time of foaming and blocking the open section. CONSTITUTION:An insert 1 is disposed in a top force 2 in a manner that an open section 10 is communicated with a runner 20 and foamed resin is in injection from the runner 20 with the pressure of approximately 2kg/cm<2> after closing mold. Then, the foamed resin passed through a number of communicating paths of communicating components 6 and can be injected easily between the insert 1 and a skin material 4. When the give quantity of foamed resin is injected, the injection of foamed resin is discontinues and the foamed resin starts to foam. Reaction is advanced together with foaming to increase molecular weight, and the foamed resin impregnating the communicating components 6 starts to be solidified. Together with the advancement of foaming, therefore, the communicating paths of communicating components 6 are blocked to prevent gas from exhausting from the open section 10 to the runner 20, and cells are prevented from getting broken to make the whole uniform hardness. |
