Should screw bands be left on jars of canned foods during storage?
Jar rings, or screw bands, should definitely be removed before storing jars because some spoilage organisms produce gas causing the lid to swell and come unsealed. If jar rings are removed before storage, it is easy to see if lids have come unsealed. Additionally, if enough internal pressure is present and rings are left on, jars may burst. Remember not to remove rings or disturb jars in any way for 12 to 24 hours after heat processing. The vacuum inside jars gets stronger over the 12 hours after heat processing. Leaving the ring on during this period helps the vacuum form.
Barbara Willenberg, Nutritional
Sciences, University of Missouri-Columbia
Last update: Tuesday, May 05, 2009