THERMOPLASTIC STOPPER FOR BOTTLE Russian patent published in 1998 - IPC

FIELD: food industry. SUBSTANCE: stopper has body with concentric outer and inner tubular members, common bottom, circular projections on inner surface of outer tubular member and on outer surface of inner tubular member, belt with axial corrugations, circular groove with taper face forming profile with cross-section in form of acute wedge with point at side of axial corrugation belt. Axial corrugations of variable height are made on taper face and outer surface above circular projection. Stopper body is made of low and high pressure polyethylene. EFFECT: increased tightness and improved reliability of sealing, provision of good state of packed product. 3 cl, 4 dwg