Container for microwave oven

Patent metadata

Field	Value
Publication number	US-11447324-B2
Application number	US-202016903769-A
Country	US
Kind code	B2
Filing date	Jun 17, 2020
Priority date	Sep 30, 2014
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

An object is to provide a microwave container configured to precisely discharge vapor from a vapor-discharging part to avoid any vapor discharge from the remaining portions, and the microwave container includes: a container main body having an opening in its upper portion; a flange part formed to extend outwardly from the opening of the container main body; and a heat-seal part in a rib shape formed over the entire periphery of an upper surface of the flange part and heat-sealed to a film-shaped lid member for sealing the opening, wherein the heat-seal part includes a first heat-seal part for discharging vapor generated in the container main body by breaking the heat seal with the lid member when the vapor reaches a predetermined pressure, and a second heat-seal part wider than the first heat-seal part.

First claim

The invention claimed is:

1. A microwave container comprising:
a container main body having an opening in an upper portion thereof;
a flange part formed to extend outwardly from the opening of the container main body;
a heat-seal part formed over an entire periphery of an upper surface of the flange part and heat-sealed to a film-shaped lid member for sealing the opening, wherein
the heat-seal part includes
a first heat-seal part for discharging vapor generated in the container main body by breaking the heat seal with the lid member when the vapor reaches a predetermined pressure, and
a second heat-seal part other than the first heat-seal part,
the first heat-seal part is formed by a V-shaped pattern on the middle and forms an M-shaped pattern together with a lid-opening part formed by a reversed V-shaped pattern in a part of the second heat-seal part on both sides of the first heat-seal part,
a part in the second heat-seal part other than the lid-opening part is inclined so as to bend outward from the end on the opening side of the M-shaped pattern and is connected to the pair of outer ends of the V-shaped pattern.

2. The microwave container as described in claim 1 , wherein adhesion strength of the second heat-seal part is higher than that of the first heat-seal part.

3. The microwave container as described in claim 2 , wherein an adhesion strength per unit width of the second heat-seal part is higher than that of the first heat-seal part.

4. The microwave container as described in claim 1 , wherein
the second heat-seal part is wider than the first heat-seal part.

5. The microwave container as described in claim 1 , wherein the first heat-seal part is formed by a V-shaped pattern on the middle and forms an M-shaped pattern together with a lid-opening part formed by a reversed V-shaped pattern in a part of the second heat-seal part on both sides of the first heat-seal part,
the lid-opening part has a sharpened tip.

6. The microwave container as described in claim 1 , wherein the first heat-seal part is formed by a V-shaped portion widely opened to the outside in plan view, and
seal strength of the vapor-discharging part is weakened toward a tip located inside the V-shaped portion.

7. The microwave container as described in claim 1 , wherein the first heat-seal part is formed by a V-shaped pattern on the middle and forms an M-shaped pattern together with a lid-opening part formed by a reversed V-shaped pattern in a part of the second heat-seal part on both sides of the first heat-seal part,
the heat-seal part does not have the first heat-seal part and the lid-opening part in a portion other than the M-shaped pattern.

8. The microwave container as described in claim 1 , wherein the flange part is inclined while an extended end thereof points downward, and the heat-seal part is formed while an upper surface thereof is in a horizontal direction.

9. The microwave container as described in claim 1 , wherein the flange part has recess portions on opposite sides of the first heat-seal part in an outer area of the second heat-seal part.

10. The microwave container as described in claim 1 , wherein the container main body has a step portion on a side surface of the container main body, the step portion peripherally provided thereon and having a downwardly tapered diameter, and the side surface on the opening side is outwardly inclined from the step portion with respect to a vertical direction.

Assignees

• Kyoraku Co Ltd

Inventors

• Ishikawa Shinji
• MARUYAMA Kumio

Classifications

• B65D81/34

  for packaging foodstuffs {or other articles} intended to be cooked or heated within the package · CPC title

• B65D77/2036 Primary

  the seal having a stress concentrating portion · CPC title

• B65D77/20

  by applying separate lids or covers {, i.e. flexible membrane or foil-like covers} · CPC title

• B65D47/32

  with means for venting · CPC title

• B65D25/38

  Devices for discharging contents ({containers formed by folding or erecting paper blanks B65D5/72} ; incorporated in removable or non-permanently secured closure members B65D47/00; for discharging thin flat articles B65D83/08) · CPC title