Hollow article molding method and molding apparatus and hollow article
AssigneeNissei Asb Machine Co., Ltd.
InventorsSoichiro Sato, Masayuki Usami
Life of this patent
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Abstract
A hollow article is molded in a state where an inner surface of a neck portion including an inner screw portion is held by an inner neck mold, and then, the hollow article is demolded from the inner neck mold by inserting an ejection rod into the hollow article to be engaged with an inner surface of the hollow article and rotating the hollow article together with the ejection rod.
Claims10
A method for molding a hollow article, the hollow article including a neck portion opened on one end side thereof and a body portion connected to the neck portion, and an inner screw portion being formed on an inner surface of the neck portion, the method comprising:
- molding the hollow article in a state where the inner surface of the neck portion including the inner screw portion is held by an inner neck mold, and then;
- demolding the hollow article from the inner neck mold by inserting an ejection rod into the hollow article to be engaged with an inner surface of the hollow article and rotating the hollow article together with the ejection rod.
An apparatus for molding a hollow article, the hollow article including a neck portion opened on one end side thereof and a body portion connected to the neck portion, and an inner screw portion being formed on an inner surface of the neck portion, the apparatus comprising:
- a molding part configured to mold the hollow article in a state where the inner surface of the neck portion including the inner screw portion is held by an inner neck mold;
- and
- a take-out part configured to demold the hollow article from the inner neck mold,
- wherein the take-out part includes an ejection rod including an engagement portion rotatably inserted into the hollow article and engaged with an inner surface of the hollow article during rotation.
A hollow article comprising:
- a neck portion opened on one end side thereof and to which an inner screw portion is formed on an inner surface thereof;
- a body portion connected to the neck portion;
- and
- a small-diameter portion having an inner diameter smaller than that of the neck portion entirely in a circumferential direction of the hollow article in a top view, the small-diameter portion being connected to the neck portion and the body portion,
- wherein an opening shape of the small-diameter portion is a non-circular shape.
Dependencies are inferred from the claim text.