Twist-Off Jar 212ml Deep

Twist-off lids are professional closures for mason jars with a TO finish. They are designed for machine filling, in which a constant pressure, an optimal temperature of the material and a precisely defined torque ensure perfect function.

Twist-off caps are not screw caps. The difference: they do not have a continuous thread, but projections, the so-called cams.

CAN TWIST-OFF CAPS ALSO BE USED IN HAND FILLING?

Jars with TO closures can, of course, also be used for manual filling - and are becoming increasingly popular in households thanks to their ease of use. In the case of manually attached twist-off closures, however, no guarantee can be given with regard to tightness and overtightening, since the pressure and torque are not always optimally matched to the lids.

In addition, in the case of lids with a button, it cannot be guaranteed that the vacuum button will always work during manual filling and that a loud 'plop' will be heard when the jar is opened.

TIPS FOR MANUAL FILLING

A common problem with hand filling is overtightening of the lids. The cams are damaged and the slide no longer closes properly. Especially when filling by hand, there is a tendency to screw the lid on the glass as tightly as possible. It is better to attach the lid with light pressure and turn just enough to feel resistance.

Whether the jar is tightly closed by the lid also depends on the temperature. The seal inside the cap becomes more flexible with heat and hugs the rim of the glass more easily. During machine filling, TO closures are heated to around 60 °C before they are used. When filling manually, it is advisable to preheat the closures in warm water and leave them in the water bath until use.