Toyo Seikan Kaisha, Ltd.

Japan Crown Cork Co Ltd.

Masakazu Tatsuta

Kashiwa Murayama

Yoshiharu Shibata

Hideki Yajima

Hiroshi Sato

Tateo Kubo

Yuji Kano

Nobu Utsunomiya

Kinji Fuchie

A molding system for molding a plastic grip member and, at the same time, linking it to a linking protruding piece of a container closure body. The molding system comprises a rotary container closure body conveyor apparatus and a compression molding apparatus. The container closure body conveyor apparatus is provided with a rotary disc that has a plurality of container closure body-receiving portions formed therein and a rotation preventing mechanism that prevents the rotation of the container closure bodies held in the receiving portions. The compression molding apparatus has a mold constituted by a first mold portion and a second mold portion. The first mold portion includes a moving member that moves between a mold position and a separated position. The moving member has a supporting surface for supporting the skirt wall of the container closure body and a support projection for supporting the linking protruding piece of the container closure body. A moving member-moving mechanism is disposed to selectively move the moving member to the mold position or to the separated position.

Apparatus for forming plastic grip member of container closure

A container closure is disclosed having a metallic body and a plastic grip piece. The body includes a top panel wall, a skirt wall extending down from the perepheral edge of the top panel wall, and a linking protruding piece that protrudes from the lower end of the skirt wall. The grip piece includes a linking base portion that covers at least both surfaces of the end portion of the linking protruding piece of the body, and a grip portion that extends from the linking base portion. The grip piece is formed and is, at the same time, linked to the linking protruding piece of the body by flowing a plastic material from one side of the linking protruding piece that positions in the space of the mold. A plastic material inflow groove that extends from the free end thereof toward the lower end of the skirt wall is formed on the side of the other surface of the linking protruding piece of the body.

Container closure having metallic body and plastic grip piece

Compression molding apparatus

A compression molding apparatus includes a rotatable supporting member and circumferentially spaced molds mounted on the rotatable supporting member. The molds are conveyed successively through a plastic material feed zone, a compression molding zone and a discharge zone by the rotation of the rotatable supporting member. A plastic material in a heat softened state is fed into the molds which are disposed within the plastic material feed zone. Each of the molds include a first mold portion and a second mold portion which defines a mold cavity. The mold is opened and closed by moving the mold portions relative to each other in a predetermined direction. A conduit hole extending from the mold cavity is formed in the second mold portion. Each mold includes a compression rod which slides in the conduit hole. The conduit hole has a plastic receiving portion opened frontwardly in the rotating direction of the rotatable supporting member. The plastic material feeder includes an extruder which has an opening opposite to a passage for conveying the plastic. The extruder is constructed such that the heat softened plastic material extruded from the extrusion opening is received in the plastic receiving portion of the conduit hole and cut. The extrusion opening is elongated in the conveying direction of the plastic receiving portion and has a portion progressively wider downstream as viewed in the conveying direction.

Growing community of inventors

Hiratsuka, Japan

Masakazu Tatsuta