METHOD OF REVERSE CURLING IN METAL CONTAINERS FOR BEVERAGES AND CONTAINERS FOR BEVERAGES WITH REVERSE CURLS Russian patent published in 2020 - IPC B65D1/02 

FIELD: package and storage.

SUBSTANCE: bottles (100) with inside upper parts near the bottle opening, methods and tools for making such bottles. Inner top parts create compression stresses in bottle material and can reduce probability of material splitting, since upper part can not be stretched to larger outer diameter, as in case of upper parts with curls to the outside. Topped inner parts can be formed using rollers (500) with inlet radius (504) located near outer diameter of bottle opening. Turn inside is formed when the material of the bottle enters the rollers near input surface (502) of the rollers, passes through working surface (506) of the rollers and leaves the roller on output surface (510) of the rollers.

EFFECT: resultant curl is in contact with bottle material edge near bottle inner surface.

20 cl, 5 dwg