How to choose ?
1. See the identification method. Check that the can seal is tight. Is the appearance clean?
2, hand pinch identification method. Check the cans for swelling. The bottom and lid of the can be pressed with a finger to observe the presence or absence of the expansion can.
3. Listen to the identification method. Check the quality of canned contents. Tap the center of the bottom cover of the can with your finger and listen to the sound. The sound of good canned food is crisp and sound. The secondary and inferior cans include insufficient contents, and the sound of large gaps is turbid and empty.
4. Air leak identification method. Check the cans for leaks. Sink the cans into the water and squeeze the bottom of the can. If there is a leak, small bubbles will be found.