EASY OPEN CONTAINER AND ITS MANUFACTURING METHOD

摘要

PURPOSE:To obtain a container having a pressure resisting sealing performance and easy to open and not requiring a precise matching in position at the time of heat sealing by a method wherein dot-like small recess parts having a specific pitch and depth are formed on a flange at a specific width all around the periphery of the flange from the innermost circumference of the flange formed of a multilayer sheet to its outer peripheral extremity. CONSTITUTION:A container 1 has a lamination strength of 300-2000g/25mm between a seal layer 4 and its adjoining layer 5, a thickness of the seal layer of 1-70mum, the seal layer formed of a multilayer sheet 1 and a flange 2 formed thereon. The flange 2 is provided at a width of 1-3mm from its innermost circumference to the outer peripheral extremity all around the periphery thereof with dot-like small recess parts 7 formed at a pitch of 0.3-0.8mm and having a recess depth d=1t-10t (wherein (d) is recess depth and (t) is the thickness of the seal layer). The entire surface of the flange 2 is heat sealed to a lid in such a manner that seal strength between the flange surface and the lid becomes equal to and exceeds that between the seal layer and the adjoining layer of the container body.