Canning lids twisting
doing hot bath for sauerkraut. Cleaning jar rims, adding more salt water to 1 inch of top, putting new lids and rings on jars. Screwing rings on tight. Put jars in canning, filling with cold water and bring to rolling boil for 30 minutes. When we turn off stove and remove lid to canner we are seeing most of the lids have bent in upward position. WHAT IS MAKING THIS HAPPEN?
Best Answer
You should not put the bands on "tight".
From Fresh Preserving Water Bath Canning
CLEAN mason jar rim and threads of jar using a clean, damp cloth to remove any food residue. Center lid on jar allowing sealing compound to come in contact with the jar rim. Apply band and adjust until fit is fingertip tight. Place filled jars in canner until recipe is used or canner is full. Lower rack with jars into water. Make sure water covers jars by 1 to 2 inches.
Fresh Preserving Problem Solver
Condition: Lid buckles, appearing to warp or bulge upward under the screw band. If spoilage is evident, do not use.
When buckling is apparent immediately after heat processing, cause is overly tight application of screw bands. Using your fingers, screw bands down until resistance is met, then increase to fingertip tight. Do not force. Do not use a lid wrench to apply bands.
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Why are my canning lids warping?
Canning rings too tight As the filled jar is heated, headspace pressure increases until excess air is vented from the jar. When the band is applied too tightly, there is no way for air to be exhausted from the jar. Consequently, the pressure build-up warps the lids and disrupts the seal formation.Are buckled canning lids safe?
The Washington State University Extension Service says: If the food was processed correctly and the lids remain sealed, then even if the lids buckle, the safety of the home canned food will not be affected. I'd be careful about that, though. Best to keep any jars with buckled in the fridge until they are used.How do you get a twisted lid unstuck?
You can try draping a textured hand towel or a silicone trivet over the lid for better friction. You can also use a rubber cleaning glove or even try stretching a rubber band around the outside of the lid. All of these will give you a better grip on the lid, making it easier to twist off.What happens if you over tighten canning lids?
During processing, air is forced out of the jar. If the screw band is too tight, air cannot escape. Air must be able to escape from the jar during processing; if it cannot, it can buckle lids. Buckled lids are deformed in some way by air in the jar trying to force its way out; they may not seal properly.Twist off lids production canning jar lids equipment workshop
More answers regarding canning lids twisting
Answer 2
It's a somewhat common problem relating to the lids being screwed down too tight. They need to be tight but certainly not cranked on as hard as possible. I usually tighten to the point where the ring is no longer spinning easily and then give maybe another 1/8 of a turn. I believe Ball also sells a ring tightener that is said to put the rings on "just right".
The buckling itself is caused by the air being forced out during the waterbath (or pressure can) process. If the lid is too tight there is no room for the air to "squeak" out where it normally would under the rubber on on the lid. The pressure builds until it is enough to actually bend the metal of the lid to make a space in which to evacuate the jar.
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