Toyo Seikan Kaisha, Ltd.

Japan Crown Cork Co Ltd.

Nobu Utsunomiya

Kashiwa Murayama

Masakazu Tatsuta

Noriyuki Imagawa

Compression molding apparatus

A compression molding apparatus for forming a plastic grip ring and simultaneously linking it integrally to a linking protruding piece of a container closure body. The apparatus includes a mold composed of a first mold portion and a second mold portion adapted to be opened or closed by being moved relative to each other in a predetermined direction. The first mold portion has an accommodating space for receiving the closure body and a first mold cavity extending in a ring-like shape. At least the free end portion of the linking protruding piece of the closure body to be received in the accommodating space is projected into the first mold cavity. The second mold portion has a main part consisting of a second mold cavity extending in a ring-like shape and a conduit hole extending in said predetermining direction from the second mold cavity and a compression rod to be slidably inserted into the conduit hole. A plastic material fed into the conduit hole is compressed by the compression rod and molded into the grip ring having a shape corresponding to a molding space defined by the cooperation of the first and second mold cavities.

A closure having a metal shell (2) and a synthetic resin liner (4). The liner has at least one annular projection (10). The diameter of the liner is less than the diameter of a skirt (8) depending from a top surface (6) of the shell so that a space is formed between the skirt and the liner. A tab (16) extends into the space.

Growing community of inventors

Hiratsuka, Japan

Nobu Utsunomiya