Manufacturing method of cap and manufacturing apparatus of cap

Patent metadata

Field	Value
Publication number	US-11034114-B2
Application number	US-201916270668-A
Country	US
Kind code	B2
Filing date	Feb 8, 2019
Priority date	Feb 9, 2018
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A manufacturing method of a cap ( 100 ) includes: supplying a first resin material to a molded product ( 111 A) having a top plate portion ( 121 ) and a skirt portion ( 122 ) integrally formed on the top plate portion ( 121 ) through a corner portion ( 123 ); molding the first resin material of the molded product ( 111 A) disposed in a first lower mold ( 21 ) into a sliding layer ( 141 ) with a first upper mold ( 22 ); supplying a second resin material to the sliding layer ( 141 ); molding the second resin material of the molded product ( 111 A) disposed in a second lower mold ( 31 ) into a sealing layer ( 142 ) with a second upper mold ( 32 ); taking out a sealing member ( 112 ) in the molded product ( 111 A); and inserting the sealing member ( 112 ) into another molded product ( 111 A).

First claim

What is claimed is:

1. A manufacturing method of a cap, comprising:
supplying a first resin material to a molded product having a top plate portion and a skirt portion integrally formed on the top plate portion through a curved corner portion having an annular shape;
molding the first resin material of the molded product disposed in a first lower mold into a sliding layer having a predetermined shape with a first upper mold;
supplying a second resin material to the sliding layer;
molding the second resin material of the molded product disposed in a second lower mold into a sealing layer having a predetermined shape with a second upper mold;
taking out a sealing member including the sliding layer and the sealing layer in the molded product;
performing a predetermined molding on the molded product; and
inserting the sealing member into another molded product different from the molded product on which the predetermined molding is performed.

2. The manufacturing method according to claim 1 , wherein the first lower mold and the second lower mold each include a cylindrical fixed mold and a columnar movable mold which is disposed in an opening of a center of the fixed mold and constitutes a recess having a shape of the top plate portion and the corner portion of the molded product together with an upper surface of the fixed mold on the upper surface,
the movable mold reciprocates between a position constituting the recess and a position which is flush with the upper surface of the movable mold and the upper surface of the fixed mold,
the upper surface of the fixed mold and the upper surface of the movable mold are flush when the molded product is placed on the first lower mold and the second lower mold, and
when the first resin material is molded with the first upper mold and when the second resin material is molded with the second upper mold, the fixed mold and the movable mold constitute the recess.

3. The manufacturing method according to claim 1 , wherein the second upper mold includes a cylindrical first molding portion and a columnar second molding portion provided at a center of the first molding portion,
the first molding portion is movable with respect to the second molding portion, and
after molding the sealing layer, the first molding portion protrudes from the second molding portion, and gas is ejected from a gap between the first molding portion and the second molding portion.

Assignees

• Daiwa Can Co Ltd

Inventors

• Fujishige Eiji
• Matsumura Junji
• Araki Eiji
• Takagi Kenji
• Kawada Takashi

Classifications

• B29D99/0096 Primary

  Producing closure members for containers, e.g. closure caps or stoppers · CPC title

• B65D41/34

  Threaded or like caps or cap-like covers {provided with tamper elements formed in, or attached to, the closure skirt} · CPC title

• B65D41/3428 Primary

  the tamper element being integrally connected to the closure by means of bridges · CPC title

• B65D41/325

  with integral internal sealing means · CPC title