| 摘要 |
PROBLEM TO BE SOLVED: To suppress bending deformation of a lower end portion of a column portion while preventing lowering of decompression adsorption capacity.SOLUTION: A body portion 13 is formed with a plurality of panel portions 24 recessed to inside in a diametrical direction at interval in a circumferential direction. A clearance between the panel portions adjacent in the circumferential direction is made to be a colum portion 31. The panel portion and the colum portion have a rectangular shape extending in a tilting direction of a pair of a bottle axis O direction and the circumferential direction, in a side surface view viewing the body portion from outside in the diametrical direction. The panel portion is divided by a pair of the colum portions respectively positioned at both ends in the circumferential direction in the panel portion, and a pair of beam portions 32a and 32b respectively positioned at both ends in a bottle axial direction in the panel portion and extending the circumferential direction. Of the pair of beam portions, on the lower beam portion 32a positioned on a bottom portion 14 side along the bottle axis direction, a penetrating groove 33 penetrating in the bottle axis direction is formed. The penetrating groove is formed at one end portion on an acute angle part 24a side of the rectangular shape formed by the panel portion in the side surface view, of both end portions in the circumferential direction at the lower beam portion. |
