| 摘要 |
PURPOSE:To manufacture an extrusion having a small cross-sectional form with favorable production efficiency by a method wherein a plurality of extrusions are simultaneously extruded in the state of being separated from one another and, after that, made into an integral body by fusing to each other in linear contact and the resultant integral extrusion group is continuously cured and finally the cured extrusion group is out into respective extrusion. CONSTITUTION:Rubber material M is kneaded in a screw type extruder cylinder 4b, and, after that, shaped by respective orifices 2 of a die 3 so as to be extruded in a group of extrusion 1, 1 and 1 under the state being separated from one another. At this time, the respective extrusions 1 are fused to each other in linear contact into an integral body by means of a pair of fusing rolls and carried to a hot air vulcanizing tank 7 and a microwave vulcanizing tank 8 in the order named. Because the integrally fused extrusions pass the central part, at which the heat distributions is flat, of the vulcanizing tanks 7 and 8, the scattering of vulcanization among the extrusion located at both sides and the extrusion located at the center of the group becomes small. Finally, the integrally fused extrusions are cut into respective extrusion with respective cutting rolls 11, 11 and 11. At this time, because the bonding between the respective extrusions 1 produced by fusing in linear contact is weak, the cutting is done so as to produce a clear cutting surface with no ruggedness. |
