| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make it compatible to secure both the seal strength and easy seal breaking property, regardless of the shape of a receptacle. <P>SOLUTION: By placing an annular protrusion (1c), across its whole circumference, near close to the opening (1a) side of a flange section (1b), the seal portion S between the annular protrusion (1c) and the periphery portion (2a) of a cover 2 comes, across its whole circumference, located near the core of the resilient deformation of the flange section (1b), thus making it possible that when any portion of the whole periphery of the cover 2 is pinched and rolled up for unsealing, neither the flange (1b) at the unsealing side nor the annular protrusion (1c) is hard to be resilient deformed in the same direction, thus its tear-off power is concentrated on the sealing portion S, resulting in the seal portion starting to exfoliate even though the sealing portion is heat-sealed to provide a necessary sealing strength. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
