| 摘要 |
A screw cap of synthetic resin that always develops a reliable stable function of preventing unjust unsealing. It comprises a bottle mouth cylinder (18) constituting an outlet port in a bottle body, the bottle mouth cylinder being provided with a cap main body (2A) serving as a cap section having threadedly closely fitted thereon a cylindrical wall (3A) serving as a cylindrical wall section, and with a second locking section (12) locked from below across a first locking section (20A) formed around the outer peripheral surface of the bottle mouth cylinder (18), and a sealing ring (11) connected to the lower end of the cylindrical wall (3) through a plurality of easily breakable pieces (7), wherein a plurality of second press slope sections (14) are disposed on the upper end of the sealing ring (11) so that they are closely opposed to a plurality of first press slope sections (9) disposed on the lower end of the cylindrical wall (3), so as to slidably abut thereagainst in an unscrewing direction and at a slope angle (b) that is a larger acute angle than the lead angle (a) of the thread ridge (19A) of the bottle mouth cylinder (18), the sealing ring (11) being forcibly depressed by abutment between both press slope sections during the unscrewing operation of the cap main body (2A). |
