Resin-made storage container
View Patent ↗The object of this invention is to provide a container having a reduced area of vacuum-absorbing panels and thus acquiring improved appearance and having strength against a pressure drop, i.e., the strength enough to retain the shape of the container even when there is a pressure drop inside the container. A shoulder portion or a bottom portion of a resin-made storage container is molded by aligning one or two groups of three corners and one or two groups of three pillars vertically and in parallel to the central axis of the container. Each group of three corners is a part of the corners forming a cross-section of a regular enneagon and being connected to either the shoulder portion or the bottom portion, and the lines connecting these three corners form a regular triangle. Each group of three pillars is a part of the pillars belonging to the body and forming a cross-section of a hexagon, and the lines connecting these three pillars form a regular triangle. If there is a pressure drop inside the container due to a decrease in the temperature of the contents, stress builds up inside the body of the container in such a way that the body deforms into a regular triangular prism, with vertically aligned corners/pillars serving as the three angles. As a result, the container has an enhanced level of strength against the force coming from any direction. With the shape stabilized, the container has also high resistance to buckling.
1. A resin-made container, comprising:
a neck disposed in a top portion;
a sidewall connected to the neck; and
a bottom portion in a lower part of the sidewall,
wherein the sidewall comprises at least two parts disposed in upper and lower portions,
each part has a regular 3n-angular shape in a cross-section perpendicular to a central axis of said container where n is an integer of 2 or more, with an integer n in a part adjacent to each other being different from the integer n in an other part and being in a prime relationship with each other such that neither the integer n in the part or the integer n in the other part is an integer multiple of the other; and
the construction of the resin-made container is such that, in multiple, mutually adjacent parts including those parts disposed at least in the upper or lower portion of the body, three selected corners of a regular triangle formed by lines connecting these corners are a part of the corners of a regular 3n-angular shape belonging to respective parts, and are disposed along lines parallel to the central axis of the container.
2. A resin-made container, comprising:
a neck opened in a top portion;
a shoulder portion disposed under the neck and having a shape of a regular enneagon in a cross-section perpendicular to a vertically extending central axis of the container;
a body connected to said shoulder portion and having a shape of a regular hexagon in the cross-section perpendicular to the vertically extending central axis; and
a bottom portion connected to said body and having a shape of a regular enneagon in the cross-section perpendicular to the vertically extending central axis of the container,
wherein a group of three selected corners and a group of three selected pillars are aligned vertically and in parallel to the central axis of the container, said group of three selected corners being a part of the corners that belong to the shoulder portion and forming a cross-section of a regular enneagon, with lines connecting these selected three corners forming a regular triangle, and said group of three selected pillars being a part of the pillars that belong to the body and form a cross-section of a hexagon, with lines connecting these three selected pillars forming a regular triangle.
3. A resin-made container, comprising:
a neck opened in a top portion;
a shoulder portion disposed under the neck and having a shape of a regular enneagon in a cross-section perpendicular to a vertically extending central axis of the container;
a body connected to said shoulder portion and having a shape of a regular hexagon in the cross-section perpendicular to the vertically extending central axis; and
a bottom portion connected to said body and having a shape of a regular enneagon in the cross-section perpendicular to the vertically extending central axis of the container,
wherein a group of three selected corners and a group of three pillars are aligned vertically and in parallel to the central axis of the container, said group of three selected pillars being a part of the pillars that belong to the body and form a cross-section of a hexagon, with lines connecting these three selected pillars forming a regular triangle, and said group of three selected corners being a part of the corners that belong to the bottom portion and form a cross-section of a regular enneagon, with lines connecting these three selected corners forming a regular triangle.
4. A resin-made container, comprising:
a neck opened in a top portion;
a shoulder portion disposed under the neck and having a shape of a regular enneagon in a cross-section perpendicular to a vertically extending central axis of the container;
a body connected to said shoulder portion and having a shape of a regular hexagon in the cross-section perpendicular to the vertically extending central axis; and
a bottom portion connected to said body and having a shape of a regular enneagon in the cross-section perpendicular to the vertically extending central axis of the container,
wherein a group of three selected corners, a group of three selected pillars, and another group of three corners are aligned vertically and in parallel to the central axis of the container, said group of three selected corners being a part of the corners that belong to the shoulder portion and form a cross-section of a regular enneagon, with lines connecting these three selected corners forming a regular triangle, said group of three selected pillars being a part of the pillars that belong to the body and form a cross-section of a hexagon, with lines connecting these three pillars forming a regular triangle, and said another group of three selected corners being a part of the corners that belong to the bottom portion and form a cross-section of a regular enneagon, with lines connecting these three selected corners forming a regular triangle.
5. The resin-made container according to claim 1 , wherein the container is a PET bottle.
6. The resin-made container according to claim 2 , wherein the container is a PET bottle.
7. The resin-made container according to claim 3 , wherein the container is a PET bottle.
8. The resin-made container according to claim 4 , wherein the container is a PET bottle.