This is the way to operate a can sealer: Prepare the fruits and vegetables as for any canning, following directions formerly given for cold-pack canning.
After the fruits or vegetables have been properly prepared, blanched and cold-dipped if necessary, place them in sanitary, solderless cans. Put water or sirup on, according to directions. Put the top on the can and place the can in the sealer.
Raise the can into the chunk by swinging the raising lever at the bottom of the machine against the frame. Turn the crank, rapidly at first, with the right hand, and at the same time push the seaming-roll lever very slowly with the left hand until it will go no farther. This is one of the most important steps in the use of the machine. Continue to give the crank several turns after the seaming-roll lever has gone as far as it will go. This completes the first operation or seam.
Continue turning the crank with the right hand, and with the left hand pull the seaming-roll lever until it will go no farther in this direction. After this has been done give the crank several more turns, and the second and final operation is complete. Bring the seaming-roll lever back to the middle position and remove the can. The can is then ready for sterilization.
Before sealing a new lot of cans or after changing for a different size of can, one or two of the cans about to be used should be tested for leaks. If this is done and the cans stand the test it will be unnecessary to test the remaining cans of that same lot. The following is a simple and safe test:
Put one tablespoon of water into an empty can and seal. Have on hand a vessel containing enough boiling water to cover the can. Set aside and, as soon as bubbles disappear from the surface, immerse the can in the hot water. This heats the water in the can and creates a pressure within the can. Keep the can under the surface for two minutes, and if by that time no bubbles rise from the can the can has been sealed air-tight.
ADJUSTING THE SEAMING ROLLS
If bubbles rise from the can the seam is not sufficiently tight. If this seam is not sufficiently tight the second seaming roll needs adjusting, provided the directions regarding seaming rolls given below have been observed. To set the rolls proceed as follows: Loosen the nut on the bottom of the seaming-roll pin. With a screw driver turn the seaming-roll pin counter clockwise—that is, from right to left. Turn very slightly and, while holding the seaming-roll pin with the screw driver in the left hand, tighten nut with the right hand, and test as before.
Occasionally it is well to compare the seam after the first operation with the sample can which is sent with the machine.
If seaming rolls cut into the can they are set too close, and the seaming-roll pin should be adjusted in the opposite direction from above.