Container and method for manufacturing container

Patent metadata

Field	Value
Publication number	US-11479399-B2
Application number	US-201816499041-A
Country	US
Kind code	B2
Filing date	Mar 28, 2018
Priority date	Mar 29, 2017
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

There is provided a container that makes it possible to suppress intrusion of bacteria from the tip of a pleat part into the inside of the container. The container includes: a main body that includes a body part defining a containing portion and a flange part extending outward from an upper portion of the body part; and a lid that is joined to the flange part of the main body via an outer edge seal portion so as to cover the containing portion, the lid being formed by a lid member folded back at a fold-back portion such that portions of the lid member overlap each other. The lid has: a pleat part that includes the portions of the lid member overlapping each other and that extends from an edge of one side to an edge of the other side of the lid in a first direction; and a first lid part and a second lid part that are formed by the lid member and that are arranged on opposite sides of the pleat part. The pleat part includes: a pleat seal portion in which inner surfaces of the portions of the lid member are joined together and that extends from the edge of the one side to the edge of the other side of the lid in the first direction; and a steam passing portion that includes a through hole or a cutout formed in the pleat seal portion. Seal strength of the pleat seal portion is lower than that of the outer edge seal portion.

First claim

The invention claimed is:

1. A container having a containing portion for containing contents, comprising:
a main body that includes a body part defining the containing portion and a flange part extending outward from an upper portion of the body part; and
a lid that is joined to the flange part of the main body via an outer edge seal portion so as to cover the containing portion, the lid being formed by a lid member folded back at a fold-back portion such that portions of the lid member overlap each other, wherein
the lid has: a pleat part that includes the portions of the lid member overlapping each other and that extends from an edge of one side to an edge of the other side of the lid in a first direction; and a first lid part and a second lid part that are formed by the lid member and that are arranged on opposite sides of the pleat part,
the pleat part includes: a pleat seal portion in which inner surfaces of the portions of the lid member are joined together and that extends from the edge of the one side to the edge of the other side of the lid in the first direction; and a steam passing portion that includes a through hole or a cutout formed in the pleat seal portion,
seal strength of the pleat seal portion is lower than that of the outer edge seal portion,
a bottom member constituting the main body includes at least a thermoplastic resin layer constituting an inner surface located on the containing portion side; and a base material laminated on the thermoplastic resin layer, and
the base material of the bottom member includes a stretched film.

2. The container as claimed in claim 1 , wherein a maximum distance between inner edges of the outer edge seal portion opposed in the first direction D 1 is smaller than a maximum distance between the inner edges of the outer edge seal portion opposed in a second direction orthogonal to the first direction.

3. The container as claimed in claim 1 , wherein
the flange part includes a first edge portion and a second edge portion opposed to each other in a second direction orthogonal to the first direction, and
the pleat part extends in the first direction on a side nearer the first edge portion than a center point of the containing portion of the main body.

4. The container as claimed in claim 3 , wherein L 2 /L 1 is between 0.3 and 0.6, where L 1 represents a maximum distance in the second direction between the center point of the containing portion of the main body and the inner edge of the outer edge seal portion extending along the first edge portion and L 2 represents a maximum distance in the second direction between a base portion of the pleat part and the inner edge of the outer edge seal portion extending along the first edge portion.

5. A container having a containing portion for containing contents, comprising:
a main body that includes a body part defining the containing portion and a flange part extending outward from an upper portion of the body part; and
a lid that is joined to the flange part of the main body via an outer edge seal portion so as to cover the containing portion, the lid being formed by a lid member folded back at a fold-back portion such that portions of the lid member overlap each other, wherein
the lid has: a pleat part that includes the portions of the lid member overlapping each other and that extends from an edge of one side to an edge of the other side of the lid in a first direction; and a first lid part and a second lid part that are formed by the lid member and that are arranged on opposite sides of the pleat part,
the pleat part includes: a pleat seal portion in which inner surfaces of the portions of the lid member are joined together and that extends from the edge of the one side to the edge of the other side of the lid in the first direction; and a steam passing portion that includes a through hole or a cutout formed in the pleat seal portion,
seal strength of the pleat seal portion is lower than that of the outer edge seal portion,
wherein seal strength of the pleat seal portion with a width of 15 mm at 25° C. is 12N or less,
the seal strength is measured by using test pieces, and
the test pieces are cut out from a portion of the manufactured container.

6. The container as claimed in claim 1 , wherein
an A axis is shorter than a B axis, where the A axis is an axis that passes through the center point of the containing portion and has a minimum distance when connecting two points in an outer edge of the outer edge seal portion and the B axis is an axis that passes through the center point of the containing portion and connects two points in the outer edge of the outer edge seal portion so as to be orthogonal to the A axis, and
the pleat part traverses the containing portion and extends along the B axis.

7. The container as claimed in claim 6 , wherein a ratio of the length of the B axis to the length of the A axis is between 1.2 and 3.0.

8. The container as claimed in claim 1 , wherein the bottom member further includes a print layer.

9. The container as claimed in claim 1 , wherein tensile strength of the bottom member is 40 MPa or more.

10. A container having a containing portion for containing contents, comprising:
a main body that includes a body part defining the containing portion and a flange part extending outward from an upper portion of the body part; and
a lid that is joined to the flange part of the main body via an outer edge seal portion so as to cover the containing portion, the lid being formed by a lid member folded back at a fold-back portion such that portions of the lid member overlap each other, wherein
the lid has: a pleat part that includes the portions of the lid member overlapping each other and that extends from an edge of one side to an edge of the other side of the lid in a first direction; and a first lid part and a second lid part that are formed by the lid member and that are arranged on opposite sides of the pleat part,
the pleat part includes: a pleat seal portion in which inner surfaces of the portions of the lid member are joined together and that extends from the edge of the one side to the edge of the other side of the lid in the first direction; and a steam passing portion that includes a through hole or a cutout formed in the pleat seal portion, and
seal strength of the pleat seal portion is lower than that of the outer edge seal portion,
the container further comprising
a notch or a scar group formed in at least the flange part,
wherein tear strength of the main body and the lid is 15N or less.

11. The container as claimed in claim 10 , wherein
the flange part includes a first edge portion and a second edge portion extending parallel to each other, and
the opening means is configured to facilitate tearing of an area of the flange part extending along the first edge portion at a position more inside than the outer edge seal portion extending along the first edge portion.

12. A method for manufacturing a container including: a containing portion that contains contents and a steam passing portion that is configured to communicate the containing portion with outside when pressure of the containing portion increases, the method comprising:
a main body preparation step of preparing a main body that includes a body part defining the containing portion and a flange part extending outward from an upper portion of the body part;
a step of filling contents into the body part of the main body;
a step of preparing a lid for covering the containing portion; and
a step of forming an outer edge seal portion by joining the lid to the flange part of the main body, wherein
the step of preparing the lid comprises:
a step of pr

Assignees

• Dainippon Printing Co Ltd

Inventors

• Takahashi Makiko
• Watanabe Kaoru
• Ishikawa Hiroshi
• Takimoto Satoshi

Classifications

• B65D51/1638

  by means of an element bursting upon a predetermined pressure in the container being exceeded · CPC title

• B65D77/2056

  the cover being weakened · CPC title

• B65D77/2032 Primary

  by peeling or tearing the cover from the container · CPC title

• B32B2439/70

  Food packaging · CPC title

• B32B27/08

  of synthetic resin · CPC title