Square bottle
A peripheral groove is defined by a bottom surface, an upper side surface, and a lower side surface, and, in at least one of the upper side surface and the lower side surface, a radially outer end edge of an end portion positioned at a circumferential end portion of a panel surface portion is further away in a bottle axis direction from the bottom surface toward an adjacent corner surface portion when viewed from the outside in the radial direction.
1. A square bottle comprising a mouth portion, a shoulder portion, a body portion, and a bottom portion which are provided to be continuous in this order from a top to a bottom in a bottle axis direction, wherein
a plurality of panel surface portions are provided in the body portion to be continuous with corner surface portions therebetween in a circumferential direction around a bottle axis and a peripheral groove is formed in the body portion,
the peripheral groove is defined by:
a bottom surface facing outward in a radial direction of the bottle intersecting the bottle axis;
an upper side surface extending upward from an upper end of the bottom surface outward in the radial direction; and
a lower side surface extending downward from a lower end of the bottom surface outward in the radial direction, and,
in at least one of the upper side surface and the lower side surface, a radially outer end edge of a portion positioned at a circumferential end portion of each of the plurality of panel surface portions extends toward each adjacent corner surface portion such that the radially outer end edge is further away in the bottle axis direction from the bottom surface when viewed from the outside in the radial direction,
each corner surface portion is formed in a strip shape having a width in the circumferential direction and a length in the bottle axis direction, and
in at least one of the upper side surface and the lower side surface, a radially outer end edge of a portion positioned in each corner surface portion has a convex curved shape protruding in the bottle axis direction toward the bottom surface to reduce a groove width of the peripheral groove when viewed from the outside in the radial direction.
2. The square bottle according to claim 1 , wherein
the bottom surface has a shape that is formed such that a linear portion positioned on each of the plurality of panel surface portions and extending linearly and a curved portion positioned in each corner surface portion and having a convex curved shape outward in the radial direction are alternately provided to be continuous in the circumferential direction in a cross-sectional view perpendicular to the bottle axis, and
both circumferential end portions of the curved portion are positioned to protrude toward each of the plurality of panel surface portions adjacent to each corner surface portion having the curved portion positioned therein on both sides in the circumferential direction.
3. The square bottle according to claim 2 , wherein, in at least one of the upper side surface and the lower side surface, the radially outer end edge of the portion positioned at the circumferential end portion of each of the plurality of panel surface portions extends toward each adjacent corner surface portion from a circumferential position at which a connection portion between the linear portion and the curved portion is positioned such that the radially outer end edge is further away in the bottle axis direction from the bottom surface when viewed from the outside in the radial direction.
4. The square bottle according to claim 3 , wherein
a bottom wall portion of the bottom portion includes:
an annular ground contact portion positioned at an outer circumferential edge portion,
a cylindrical upright circumferential wall portion which is continuous with the ground contact portion from a radially inward side and extends upward, and
an annular movable wall portion extending radially inward from an upper end portion of the upright circumferential wall portion and provided to be movable upward about a connection portion with the upright circumferential wall portion.
5. The square bottle according to claim 2 , wherein
a bottom wall portion of the bottom portion includes:
an annular ground contact portion positioned at an outer circumferential edge portion,
a cylindrical upright circumferential wall portion which is continuous with the ground contact portion from a radially inward side and extends upward, and
an annular movable wall portion extending radially inward from an upper end portion of the upright circumferential wall portion and provided to be movable upward about a connection portion with the upright circumferential wall portion.
6. The square bottle according to claim 1 , wherein
a bottom wall portion of the bottom portion includes:
an annular ground contact portion positioned at an outer circumferential edge portion,
a cylindrical upright circumferential wall portion which is continuous with the ground contact portion from a radially inward side thereof and extends upward, and
an annular movable wall portion extending radially inward from an upper end portion of the upright circumferential wall portion and provided to be movable upward about a connection portion with the upright circumferential wall portion.