Back to results
US 6,280,175 B1Granted
Nozzle for injection molding rubber products
AssigneeToyo Tire & Rubber Co., Ltd.
InventorsTomihiro Saki, Kanya Kogami, Toshihiro Watanabe, Tsuneo Kamada
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeToyo Tire & Rubber Co., Ltd.
InventorsTomihiro Saki, Kanya Kogami, Toshihiro Watanabe, Tsuneo Kamada
Estimating the term…
The present invention relates to a rubber injection molding nozzle, and an injection molding machine and method using the nozzle, used mainly for the injection molding of rubber articles such as rubber vibration insulators for automobiles. It is aimed to increase the molding efficiency and productivity of rubber products and to reduce production cost. At least one portion of an injection channel extending through the injection molding nozzle is formed as an orifice having a non-circular flattend cross section, such that, at least at around major axial ends, a dimension measured orthogonal to its major axis gradually decreases as either of major axial ends is approached. For example, in the cross section, two opposed curved interior wall faces join together to form an acute-angled corner, at major axial ends. This construction enhances the effect of the internal heat generation of the rubber passing through the non-circular cross-sectional portion, facilitating the temperature rise even at center core portion of the rubber. Thus, curing time is shortened thanks to temperature rise of the whole rubber due to the internal heat generation.
A rubber injection molding nozzle comprising an injection channel extending through the rubber injection molding nozzle including an orifice having a non-circular cross section, said cross section being flattened and being elongate along a major axis, and a dimension of the orifice measured along a minor axis, orthogonal to the major axis, gradually decreasing as either major axial end is approached from a center portion thereof.
Dependencies are inferred from the claim text.