Method for hollow injection molding a shaft-unified type rotator and a molded article obtained thereby
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsNorihiko Furuya, Kimihiro Kubo, Masaaki Kondo
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Abstract
The present invention relates to a method for hollow injection molding. More particularly, it concerns a method for hollow injection molding a shaft-unified type resin rotator with excellent productivity. The molded article obtained by the present invention is excellent in dimensional accuracy, strength, surface appearance and recyclability of materials.
Claims28
A method for preparing a shaft-unified rotator comprising at least one shape required to perform a function by revolving on an axis of the shaft, wherein the rotator has a hollow part in the inside formed along the axis of the shaft, which method comprises, in a mold wherein a sprue, a runner, a gate, and a cavity are provided in this order along the flowing direction of a molten resin, arranging the mold having a gate equipped at the intersection of the axis of the rotator and an edge surface of a cavity so that the edge surface having the gate comprises the bottom of the cavity and the axis is vertical, and carrying out hollow injection molding.
A shaft-unified rotator having a hollow part in the inside, prepared by a method which comprises:
- arranging a mold having a gate equipped at the intersection of an axis of the rotator and an edge surface of a cavity so that the edge surface having the gate comprises the bottom of the cavity, and the axis is vertical;
- and
- carrying out hollow injection molding, wherein a single or plurality of corners is radiused or beveled and a groove is arranged on the surface of the rotator.
A shaft-unified rotator having a hollow part in the inside, prepared by a method which comprises:
- arranging a mold having a gate equipped at the intersection of an axis of the rotator and an edge surface of a cavity so that the edge surface having the gate comprises the bottom of the cavity and the axis is vertical;
- and
- carrying out hollow injection molding, wherein a ratio of the length of a hollow part along the axis to the whole length of the rotator is 80% or more, and a groove is arranged on the surface of the rotator.
Dependencies are inferred from the claim text.