SYNTHETIC RESIN CONTAINER

• US 20110011873A1
• Filed: 03/19/2009
• Published: 01/20/2011
• Est. Priority Date: 03/25/2008
• Status: Active Grant

• Current Assignee: TOYO Seikan Kaisha Limited (Toyo Seikan Group Holdings, Ltd.)
• Original Assignee: TOYO Seikan Kaisha Limited (Toyo Seikan Group Holdings, Ltd.)
• Inventors: Miura, Masaki, Matsukiyo, Kazushi
• Granted Patent: US 9,139,328 B2
• Time in Patent Office: Days
• US Class Current: 220/609
• CPC Class Codes: B65D 1/0284 having a discontinuous contact surface, e.g. discrete feet
• CPC Class Codes: B65D 1/44 Corrugations
• CPC Class Codes: B65D 79/0081 in the bottom part thereof

Abstract

A synthetic resin container, in which the bottom part 4 having a bottom plate part 41 which is present at the center of the bottom part and a peripheral part 42 which is positioned at the periphery of the bottom plate part 41, in the peripheral part 42, a grounding part 422 having an inside slope 422a which rises outwardly of the container with the outer peripheral edge of the bottom plate part 41 being the start point and an outside slope 422b which continues to the side surface of the bottom part 4 is formed, and when a load is applied in the axial direction in the state where the container stands upright on the grounding surface G, the shape of the bottom part 4 changes reversibly such that the bottom plate part 41 is depressed inwardly to the container. As a result, it is possible to avoid deformation of a container into an unintended shape by buckling or the like even if a load is applied to a container in the axial direction, and to ensure the rigidity of a container against a load in the axial direction.

Claims

1. A synthetic resin container comprising a mouth part, a trunk part and a bottom part, the bottom part having a bottom plate part which is present at the center of the bottom part and a peripheral part which is positioned at the periphery of the bottom plate part,

wherein, in the peripheral part, a grounding part having an inside slope which rises outwardly of the container with the outer peripheral edge of the bottom plate part being the starting point and an outside slope which continues to the side surface of the bottom part is formed, and

when a load is applied in the axial direction in the state where the container stands upright on the grounding surface, the shape of the bottom part changes reversibly such that the bottom plate part is depressed inwardly to the container.

2. The synthetic resin container according to claim 1, wherein a plurality of groove parts which extend towards the side surface of the bottom part with the outer peripheral edge of the bottom plate part being the starting point are formed in the peripheral part, whereby the grounding part is divided into a plurality of part along the circumferential direction.

3. The synthetic resin container according to claim 1, wherein a plurality of groove parts which extend in the radial direction with the outer peripheral edge of the bottom plate part being the starting point are radially formed in the peripheral part, whereby the grounding part is divided into a plurality of parts along the circumferential direction at almost equal angular intervals.

4. The synthetic resin container according to claim 3, wherein, in an overlapped virtual surface obtained by rotating a first virtual surface which comprises the axial core of the container or the axial core of the bottom part and divides the grounding part into two parts in the circumferential direction and a second virtual surface which comprises the axial core of the container or the axial core of the bottom part and divides the groove part into two parts in the circumferential direction around the axial core of the container or the axial core of the bottom part, when the intersection of the inside slope of the grounding part and the groove part is taken as A, the intersection of the outside slope of the grounding part and the groove part is taken as B, the intersection of the grounding part and the grounding surface is taken as C, and projections relative to the grounding surface of the intersections A and B which are parallel with the axial core of the container or the axial core of the bottom part are taken as D and E, the ratio (BE/AD) of the length of the line BE to the length of the line AD is 0.2 to 12, and the ratio (CE/DC) of the length of the line CE to the length of the line DC is 0.5 to 1.5.

5. The synthetic resin container according to claim 4, wherein the angle formed by the intersections A, C and B (∠

ACB) is obtuse.

6. The synthetic resin container according to claim 4, wherein, when the intersection of the axial core of the container or the axial core of the bottom part and the grounding surface is taken as O, the ratio (OC/OE) of the length of the line OC to the length of the line OE is 0.5 to 0.9.

7. The synthetic resin container according to claim 6, wherein the ratio (2OC/dmax) of the double of the length of the line OC to the maximum trunk diameter (dmax) of the container is 0.5 to 0.9.

8. The synthetic resin container according to claim 6, wherein the ratio (OD/OE) of the length of the line OD to the length of the line OE is 0.2 to 0.8.

9. The synthetic resin container according to claim 4, wherein, when the line CF connecting the point F on the groove part and the intersecting point C in the overlapped virtual surface orthogonally crosses a tangent for the groove part at the point F in the overlapped virtual surface, the angle formed by the tangent and the grounding surface is 3 to 20°

.

10. The synthetic resin container according to claim 4, wherein, in the overlapped virtual surface, when the middle point of a section AB formed along the groove part which is defined by the intersecting points A and B is taken as M, a point L is taken at a position which is separated by 45% of the length of the section AB from the middle point M along the groove part to the side nearer to the intersecting point A, and a point N is taken at a position which is separated by 45% of the length of the section AB from the middle point M along the groove part to the side nearer to the intersecting point B, the angle of inclination relative to the grounding surface of the section LN formed along the groove part which is defined by the points L and N is fixed or variable in a range of 3 to 20°

.

11. The synthetic resin container according to claim 2, wherein the bottom part of the groove part at least contains a part which has a fixed or variable inclination angle relative to the grounding surface along the direction in which the groove part extends within a range of 3 to 20°

.

12. The synthetic resin container according to claim 2, wherein the bottom part of the groove part, excluding a part which is in vicinity of the part which is connected to the bottom plate part or a part which is in vicinity of the part which is connected to the side surface of the bottom part, has a fixed or variable inclination angle relative to the grounding surface along the direction in which the groove part extends within a range of 3 to 20°

.

13. The synthetic resin container according to claim 1, wherein a step part is provided concentrically with the bottom plate part at a position nearer to the center than the outer peripheral edge of the bottom plate part.

14. The synthetic resin container according to claim 1, wherein the bottom plate part is formed such that it protrudes inwardly of the container.

15. The synthetic resin container according to claim 3, wherein the bottom part of the groove part at least contains a part which has a fixed or variable inclination angle relative to the grounding surface along the direction in which the groove part extends within a range of 3 to 20°

.

16. The synthetic resin container according to claim 3, wherein the bottom part of the groove part, excluding a part which is in vicinity of the part which is connected to the bottom plate part or a part which is in vicinity of the part which is connected to the side surface of the bottom part, has a fixed or variable inclination angle relative to the grounding surface along the direction in which the groove part extends within a range of 3 to 20°

.