SCREW CAP WITH PREVENTION OF THREAD STRIPPING (VERSIONS) Russian patent published in 1999 - IPC

FIELD: packing. SUBSTANCE: proposed screw cap is designed to prevent twisting. Cap is provided with running-on member on end of inner thread pointed to cap bottom. This member, in case of twisting, comes into meshing with start of container neck thread. As a result, wall of cap is forced outwards in zone of running-on member, thus facilitating stripping in this zone. So cap at further twisting gets stripped only at one side on running-on member which makes it impossible to force out the cap. According to other design hold-open members are arranged in sealing zone. These members come into meshing with container neck at twisting owing to deformation of sealing zone. This provides ventilation of container along sealing line before stripping of thread . EFFECT: enhanced quality of sealing. 23 cl, 8 dwg