Container
Provided is a container that allows a portion where detachment starts to be fixed at a specified position in a more reliable manner, thus allowing contents to be discharged in a direction expected by a user, allowing eventually reduction in the amount of contents to remain in the container in the end. The container includes a container body holding contents therein and a lid member, the container body and the lid member being sealed by an annular seal portion formed along a flanged face of the opening. There is provided a detaching seal portion which is detached in response to increase of pressure inside the container body associated with deformation of the container body. The detaching seal portion includes a reverse-oriented annular seal portion which occupies a part of a width of the flanged face and which projects toward a radial inner side of the opening.
1. A container including a container body holding contents therein and a lid member for closing an opening of the container body, the container body and the lid member being sealed with each other by an annular seal portion formed along a flanged face of the opening;
wherein at a specified portion of the annular seal portion, there is provided a detaching seal portion which is detached in response to increase of pressure inside the container body associated with deformation of the container body; and
the detaching seal portion includes a reverse-oriented annular seal portion which occupies a part of a width of the flanged face and which projects toward a radial inner side of the opening;
wherein there is provided an auxiliary detaching seal portion which connects opposed ends on the radial outer side of the reverse-oriented annular seal portion;
wherein the reverse-oriented annular seal portion and the auxiliary detaching seal portion form a triangular shape in which the reverse-oriented annular seal portion comprises two sides of the triangle projecting toward the radial inner side of the opening and the auxiliary detaching seal portion comprises a base of the triangle connecting opposed ends of the two sides of the triangle on the radial outer side of the opening.
2. The container according to claim 1 , wherein:
an outflow channel for discharging the contents extends radially outwards from the detaching seal portion; and
at positions facing the outflow channel from the left and right sides thereof, there are provided non-detaching seal portions comprised of a plurality of annular seal portions extending along a circumferential direction.
3. The container according to claim 2 , wherein:
the detaching seal portion and the non-detaching seal portion are connected to each other via a pair of left and right connecting annular seal portions; and
between a portion of the pair of connecting annular seal portions and the outflow channel, there are provided a pair of auxiliary non-detaching seal portions facing each other across the outflow channel therebetween.
4. The container according to claim 2 , wherein at a position of the flanged face of the container body corresponding to the outflow channel, there is formed an outflow groove sunk toward the bottom of the container body.
5. The container according to claim 1 , wherein:
the annular seal portion is provided in the form of a groove sunk in the thickness direction of the flanged face by pressing the lid member against the flanged face via a seal bar having at its leading end an annular projection having a shape corresponding to the annular seal portion; and
the reverse-oriented annular seal portion is provided as an uneven sealing force groove having a smaller curvature radius on its radial inner side than its radial outer side.