ROPP Capper, ROPP Cap Sealing Machine

The simple answer is roll on pilfer proof closure. Simply put it is an unthreaded aluminum shell that is placed on and pressed down onto the bottle neck while thread forming wheels spin around the shell and press against it to conform to the existing threads of the bottle and locking ring. In many respects a ROPP capper resembles a chuck capper although since it is not torquing a cap there is no clutch mechanism required. ROPP capping machines are available as a single head to multiple head high speed rotary systems. The big advantage of a ROPP capper machine is that it is sealing the product at the same time it is providing tamper evident security. The big disadvantage is that it is expensive to run more than one size cap. The neck and threads of the bottle must also be hard enough to withstand the pressure required to form threads such as glass or hard plastic.

Website: https://www.vkpak.com/what-is-a-ropp-capper.html

Roll-on-pilfer-proof (ROPP) caps are made from aluminium. Capping heads are available to suit a wide range of cap sizes and are usually made specific to each size of cap. Capping heads are interchangeable allowing you to run different sizes of cap with the same machine. Suitable for a wide range of cap and bottle sizes from 18mm diameter up to 38mm diameter. Typical bottle sizes of 50ml to 1000ml are handled as standard and bottles as small as 10ml can be handled by using pucks to hold the bottle during capping.