| 摘要 |
PURPOSE:To shorten a vulcanization time by a method wherein suction-back is performed until nozzle-back after injection filling and the nozzle-back is performed at the point of time when the vulcanization of the rubber material received in a nozzle part advances to a certain degree and vulcanization is performed continuously. CONSTITUTION:When a rubber product is molded, a rubber material is injected from a nozzle 6 to fill a cavity 10 through a sprue part 8 and a runner part 9 to immediately perform suction-back and a screw 7 is allowed to recede in an actual dimension of about 1mm. The apparatus concerned is constituted so as to vulcanize the rubber material allowed to fill the cavity 10 within 60 - 100 sec and, when a time 1/3 - 1/2 (20 - 50 sec) this necessary vulcanization time is elapsed, nozzle-back is performed to continue vulcanization for the remaining time. By molding the rubber product by this method, the dripping or build-up of the rubber material is prevented and a vulcanization time is limited to the time necessary for the vulcanization in the part (product part) of the cavity and the extension of a time is made unnecessary. |
