After tearing the seal structural null closing membrane of the opening

摘要

PROBLEM TO BE SOLVED: To improve the sealing properties of a cap by forming a contact ring on a top face of the cap to be screwed on a tube mouth and bringing the contact ring into contact with an engaging section or a close film formed on the upper face of a base of a closed film continuing to the end face of the mouth. ;SOLUTION: A closing film 2 is formed on a mouth 1 of a tube 3 composed of aluminum, synthetic resin or the like, and a female screw of a cap 4 is screwed with a male screw of the mouth 1. A base 7 supporting the film 2 is formed below an end face 1a of the mouth 1, while an engaging section 8 is formed on the upper face of the base 7, and the film 2 is formed so as to continue to the lower end of the engaging section 8 and close the mouth 1. A contact ring 6 formed on a top face 15 of the cap 4 is positioned so as to be brought into contact with the engaging section 8 when the cap 4 is screwed. Namely, the contact ring 6 with its outer diameter slightly lower than the inner diameter of the end face 1a of the mouth 1 is brought into contact with the engaging section.;COPYRIGHT: (C)2000,JPO