| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cap seal having a top plate for a barrel-shaped container, in which a perforation is hardly broken when the cap seal is heat-shrink fitted to a mouth part of the container having a stepped part. <P>SOLUTION: The cap seal 1 having the top plate for the barrel-shaped container is fitted to a mouth part of the barrel-shaped container having a cylindrical mouth part with a stepped part formed on its outer peripheral wall, and is equipped with: the top plate 2; a cylindrical film 3 extending downward from a peripheral edge of the top plate 2 and heat-shrinkable in the peripheral direction; and a perforation 4 in which through-holes and non-penetration parts are alternately and continuously formed in the longitudinal direction of the cylindrical film 3. The cap seal is fitted to the mouth part of the barrel-shaped container by placing the top plate 2 on an upper face of the mouth part, and externally fitting the cylindrical film 3 to the outer peripheral wall including the stepped part. The top plate 2 and the cylindrical film 3 are formed of a polylactic acid polymer. A perforation 4x in an area facing the stepped part out of the perforation 4 of the cylindrical film 3 is formed to be 0.5-1.0 mm in vertical length of the through-holes, and the vertical length of the non-penetration parts is formed to be 0.5-2.5 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT |
