EXPANDABLE CONTAINER WITH LID FOR CONTROLLING VOLUME OF FREE SPACE IN FOOD BANK

摘要

Expanding container with lid to control the amount of free space in the food jar. The invention relates to lids for cans for placing food products that must be subjected to heat treatment at temperatures above 50 ° C for sterilization or at least pasteurization. The lid (1) has a ring (2) attached to the body of the can and made with the possibility of durable and hermetic fastening to the rim of the body of the can and to the closing panel (3) which is hermetically located (13) on this ring. The ring contains a flat strip (6), directed to the vertical central axis (8) of the lid, and inclined (11) in the axial direction outwards relative to the horizontal plane (15). The cover panel (3) is attached to a flat inclined strip by a radially outer annular strip (3a). The central portion (3b), surrounded by an annular band, is pressed inward to give it a cup-shaped or dome-shaped shape and, thereby, is stabilized. After closing the can, it undergoes heat treatment. When the pressure in a closed jar changes during such heat treatment, the burying panel changes shape from a preformed position (3b) to an outwardly convex cup-shaped or domed position (3b '). After cooling the cans, the closing panel (3) returns, at least basically exactly, to its original position.