STANDING COLLAPSIBLE CONTAINER FOR LIQUID MATERIALS Russian patent published in 2010 - IPC B65D21/08 

FIELD: packing industry.

SUBSTANCE: container consists of body in the form of closed side surface made of elastic water impermeable material with side folds, also from rigid bottom and cover. At the same time body is arranged with height that varies depending on volume of material in container and is characterised with full expansion in case of filled container and adjacency of cover to bottom in case of empty container. Side folds of body are arranged in the form of horizontal corrugation in circumferential direction along whole height of body, which represents bellows working for stretching with initial condition of complete compression with absence of elasticity forces. In upper part of body, along its whole contour, there is flat float fixed, physical-geometrical parametres of which are selected as based on the following ratio: F^P≥F_el, where F_el is maximum elasticity force of fully extended body; F^P is pushing force from the side of liquid placed into container and acting at float, having minimum density.

EFFECT: container has simple design, which is stable in standing filled condition and fully collapsible in case of emptying.

3 dwg