SYNTHETIC RESIN CONTAINER

摘要

PROBLEM TO BE SOLVED: To provide a synthetic resin container, which can smoothly absorb deformation caused upon pressurization or depressurization of the container, so that a permanent deformation is not caused on the container even if its weight is reduced. SOLUTION: If the shapes of depressurization absorbing parts of the container comprise planes on which angles or lines concentrate on a certain point, the smooth move of the container is prevented. Therefore, the depressurization absorbing parts are formed into curbed planes or lines to absorb the deformation smoothly. In this connection, it is provided the constitution of the synthetic resin container such as follows. A plurality of the depressurization absorbing parts 12 deforming elastically in response to a pressure decrease inside the container are formed on a cylindrical trunk 11 in the circumference direction in such a way that the depressurization absorbing parts 12 are recessed inward and their centers 14 are recessed in deepest. Further, respective center longitudinal sectional shapes 13 of the depressurization absorbing parts 12 is made to form a curve having the crown of the center 14 and projecting toward the inside of the trunk 11. This curved longitudinal sectional shapes having deepest recessed centers eliminate a stiff part against deformation, making it possible to smoothly absorb the deformation caused by depressurization.