US 10,065,233 B2Granted

Method for manufacturing cap

AssigneeNippon Closures Co., Ltd.

InventorsKatsuhito Ichimura, Mitsuo Kumata

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method for manufacturing a cap, which can insert a sheet member easily into a predetermined position of an upper part inside a cap body, without causing deformation to the sheet member or the cap body. The sheet member does not separate when a container is brought to reduced pressure. An annular protruding portion protruding on a lower surface side is formed in an annular flat region of a sheet member of an inside plug. After or at the same time that the sheet member is inserted into and installed at a predetermined position within a cap body, the annular protruding portion is pressed axially toward a top panel wall and deformed so as to become close to a flat shape, to enlarge the outer diameter of the sheet member. The inside plug is thereby held to be inseparable from inside a skirt wall and to be axially movable.

Claims11

Dependent claims

A method for manufacturing a cap comprising a cap body, an inside plug, and a synthetic resin liner, said cap body having a circular top panel wall and a cylindrical skirt wall extending downwardly from a peripheral edge of the top panel wall, said inside plug including a circular metallic sheet member having an annular flat region in an outer peripheral part thereof, and said synthetic resin liner being disposed by press-forming on a lower surface of the sheet member, wherein an inside plug holding protruding portion protrudes radially inwardly from an upper end part of the skirt wall of the cap body, said method comprising:

inserting and installing, via a setting machine, the sheet member inside the skirt wall of the cap body so as to be positioned inside a plug holding region located above the inside holding protruding portion, said sheet member having an annular protruding portion formed on the annular flat region and protruding on a lower surface side or an upper surface side of the annular flat region of the sheet member;
and
at the same time, or after the inserting and installing, pressing, with the setting machine, the annular protruding potion in an axial direction of the cap body toward the top panel wall and deforming the annular protruding portion,
wherein the deforming causes:
the annular protruding portion to assume close to a flattened shape;
and
an outer diameter of the sheet member to be made larger than an inner diameter of the inside plug holding protruding portion to a point wherein the inside plug is retained inside the plug holding region so as to be axially retained between the inside plug holding protruding portion and an inner surface of the top panel wall, wherein, when the cap is in an installed state defined as the cap being mounted on a container, the inside plug is prevented from being brought into intimate contact with the cap body and from rotating together with the cap body at the time of unstopping.

4 more elements

inserting and installing, via a setting machine, the sheet member inside the skirt wall of the cap body so as to be positioned inside a plug holding region located above the inside holding protruding portion, said sheet member having an annular protruding portion formed on the annular flat region and protruding on a lower surface side or an upper surface side of the annular flat region of the sheet member;
and
at the same time, or after the inserting and installing, pressing the annular protruding portion in an axial direction of the cap body toward the top panel wall and deforming the annular protruding portion;
and
compressing, with a forming tool, molten resin on the lower surface side of the sheet member so as to form a liner on the lower surface side of the sheet member,
wherein the deforming causes:
the annular protruding portion to assume close to a flattened shape;
and
an outer diameter of the sheet member to be made larger than an inner diameter of the inside plug holding protruding portion to a point wherein the inside plug is retained inside the plug holding region so as to be movable between the inside plug holding protruding portion and an inner surface of the top panel wall, wherein, when the cap is in an installed state defined as the cap being mounted on a container, the inside plug is prevented from being brought into an intimate contact with the cap body and from rotating together with the cap body at the time of unstopping.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/387,723Filed 5 Mar 2013
Priority: JP 2012-07894730 Mar 2012
Published: US 2015/0135508 A121 May 2015
Granted: 4 Sep 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B21D 51/44
Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures: making closures, e.g. caps
B21D 39/00
Application of procedures in order to connect objects or parts
B21D 51/46
Making closures, e.g. caps: placing sealings or sealing material
B21D 51/50
Making closures, e.g. caps: making screw caps