Patent ID: 7137520
Filing Date: 2006-11-21
Classification: B65D

Abstract:
1. A container suitable for containing liquid and having at least one controlled deflection panel for accommodating pressure change induced in the container, said flex panel having longitudinal and transverse extents defining a plane of said flex panel, said flex panel having a flexure region positioned towards a first longitudinal end of said flex panel and a flexure initiator region positioned longitudinally away towards an opposing end of said flex panel, said flexure initiator region having a flatter arc of curvature projecting away from said plane than said flexure region to provide a longitudinal change of curvature, said regions merging together within the panels so that said initiator region can flex inwardly relative to said plane in response to pressure changes, wherein in response to pressure changes the amount of arc changes and causes said flexure region to progressively flex in response to increasing pressure change in the container.