Synthetic resin container having pressure reducing/absorbing capability in the bottom

摘要

A synthetic resin container with a bottom structure in which forms, in the bottom portion thereof, an outer circumferential wall that is continuing from the body portion, an annular leg portion inclusive of a grounding portion and an inner circumferential wall, and a raised bottom portion positioned over the grounding portion on the inside of the inner circumferential wall of the leg portion. The raised bottom portion protrudes downward beyond the root portion where the leg portion is continues to the inner circumferential wall, a plurality of arcuate protuberances are formed in a spiral shape heading from the outer edge of the central portion of the raised bottom portion toward the outer circumferential side, and arcuate dents are formed among the arcuate protuberances that neighbor each other.

主权项

1. A synthetic resin container forming, in a bottom portion thereof, an outer circumferential wall that is continuing from a body portion, an annular leg portion inclusive of a grounding portion and an inner circumferential wall, and a raised bottom portion positioned over said grounding portion on the inside of the inner circumferential wall of said leg portion, wherein said raised bottom portion is protruding downward beyond a root portion where said leg portion is continuing to the inner circumferential wall, a plurality of arcuate protuberances are formed in a spiral shape heading from an outer edge of the central portion of said raised bottom portion toward an outer circumferential side, and arcuate dents are formed among the arcuate protuberances that are neighboring each other, and said arcuate dents have branched dents that extend in a direction nearly opposite the spiraling direction and toward the outer circumference on the outer circumferential side in the radial direction, and divided protuberances are formed between said arcuate dents and said branched dents.