| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem in prior art regarding a lid member having an opening mechanism by a breaking line and a pull ring, and to suppress decrease in barrier properties due to a seal wall without impairing easy-breakability of a breaking line formed on the seal wall. <P>SOLUTION: In a synthetic resin lid member densely covering an opening of a container, the lid member includes: a seal wall covering the opening and defining a removal plate part by surrounding it by a breaking line thinly formed so as to be breakable; and a pull ring connected to the removal plate part via a connecting pillar extending upward with a peripheral edge part of the removal plate part as a base end. A barrier property film layer is laminated at a lower surface side of the seal wall so as to cover a region including the breaking line, and a slit or a hole is formed through the barrier property film layer in a breaking line portion positioned immediately adjacent to a base end of the connecting pillar. <P>COPYRIGHT: (C)2013,JPO&INPIT |
