Water stains on cans after the washing process may be due to several factors. Here are some possible causes and solutions:

  1. Water quality: Make sure that the water used in the can washer is of good quality and does not contain minerals or impurities that may cause stains. If necessary, install a water treatment system to improve water quality.
  2. Pigmentation of sauces: If cans are filled with heavily pigmented sauces, such as tomato, mustard, curry and others, the wash water can quickly become stained. In this case, equip the can washer with two water storage tanks connected to the recirculation pump, so that if the water in one reservoir becomes pigmented, the other reserve tank can be enabled immediately without stopping the shutdown.
  3. Contamination by acidified brine: In the production of acid and acidified canned food, can wash water tends to acidify due to contamination with acidified brine (pH 2.2) that remains adhered to the body of the can. In this case, it is recommended that the turbidity and pH of the wash water be monitored and adjusted as necessary.
  4. Water temperature: Make sure that the water temperature in the can washer is adequate. If the water is too hot, it can cause water spots on the cans. Adjust the temperature according to the manufacturer’s specifications.
  5. Insufficient drying: If cans are not properly dried after washing, water spots may remain on the surface. Make sure that the drying system is working properly and that the cans are completely dry before continuing with the packaging process.

Review these factors and make the necessary adjustments to avoid water stains on the cans after the washing process.