| 摘要 |
<p>PURPOSE:To improve sealing capacity by a method wherein a radius from the center of a lid to an inner surface of a standing portion which is heat- bonded is constituted to be larger than that from the inside of a cylinder to an inner surface of the cylinder which is heat-bonded, and the lid is press fitted into the cylinder. CONSTITUTION:A lid 1 is equipped with a base material 2 for a can-like vessel, a thermoplastic resin layer 3 laminated on the base material 2, a tab 4 made of synthetic resin mounted on the upper surface of the thermoplastic layer 3 for opening the lid 1 and a score portion 5 which enables the lid 1 to be opened with the tab 4. A radius Cr of the lid 1 which is made larger than a radius Br of a cylinder 6 is press-fitted and heat-bonded, with the cylinder 6 provided with a flange portion 602. This allows a sealed portion to be increased in size not only in side sealing but also in the top of the flange portion 602, improving sealing strength and improving sealing of the lid 1 and the cylinder 6.</p> |
