INJECTION RUBBER MOLDING NOZZLE, INJECTION MOLDING MACHINE AND MOLDING METHOD

摘要

Rubber injection molding nozzle, and injection molding machine and method using the nozzle, mainly used for injection molding of rubber articles such as rubber vibration isolators for automobiles. At least part (6) of an injection channel (5) passing through the injection molding nozzle (1) has a non-circular cross section. For example, an orifice in the injection channel has a substantially elliptical flattened cross section, two faces of which form opposite curved interior walls meet to form an acute angle, at the ends of the cross section on the major axis. This construction enhances the effect of internal heat generation in the rubber passing through the non-circular cross-sectional part, facilitating the temperature increase even in the innermost part in the rubber. Thus, the vulcanization time is shortened thanks to the increase in the temperature of all of the rubber due to the internal production of heat.