| 摘要 |
PCT No. PCT/EP90/00561 Sec. 371 Date Sep. 30, 1991 Sec. 102(e) Date Sep. 30, 1991 PCT Filed Apr. 10, 1990 PCT Pub. No. WO90/11944 PCT Pub. Date Oct. 18, 1990.The end wall of a screw cap of rigid thermoplastics material is provided with a sealing ring of heat-polymerized plastisol and the cylindrical skirt of the cap has an internal multiple thread at its upper end, an intermediate opening tear-strip and a lower part with an internal annular engagement rib which snap-engages under an annular rib of triangular cross-section situated below the thread of the threaded neck of a rigid container. The annular rib of the cap is interrupted in a plurality of zones and the neck of the container has a corresponding plurality of projections which extend downwards from the base of the triangular rib and, upon completion of the first screwing on of the cap, are each positioned in one of the interrupted zones of the rib of the cap, so as to prevent both a limited accidental unscrewing of the cap and the overtightening of the cap, and thus prevent the seal of the closure from being compromised in both cases.
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