Why do some ceramic tableware turn yellow after being used for a long time?

In the past period of time, the epidemic has spread. Many users have reported to the editor of ceramic tableware manufacturers that their ceramic tableware has turned yellow. The following editor will share with you 4 reasons why ceramic tableware tableware is yellow: Reason 1. The quality of tap water is different. We all know that a kettle that uses tap water to boil water will have a thick layer of limescale after a long time. The water purifier installed at home will be very clear. When the filter element is replaced every once in a while, you will see everything. The powdery yellow sand-like impurities on the surface of the disassembled PP cotton will make people feel sick. Ceramics have a certain degree of water absorption. Ceramic tableware absorbs various oil stains during use, and absorbs a certain amount of water during cleaning. When placed in a high-temperature disinfection cabinet, the water evaporates and the impurities in the water will attach to the tableware. On the surface of the glass, the phenomenon of yellowing and blackening is formed. Reason 2. We will find that there are some bowls that are not put in the disinfection cabinet. After a long time, a circle of yellow things will appear at the bottom of the bowl. In fact, this is the detergent we use when washing dishes. Residue. The dishwashing liquid is not cleaned after washing the bowl, and it accumulates on the bowl for a long time, and it will turn yellow after a long time. The main ingredients of detergent are sodium alkyl sulfonate, fatty alcohol ether sodium sulfate, foaming agent, solubilizer, flavor, water, coloring, preservative, etc., all of which are actually chemical ingredients. When the tableware is not sufficiently cleaned and there are cleaning residues, under the action of the high temperature of the disinfection cabinet, these chemical components will react at a high temperature and show traces. Reason 3. placement problem ① The temperature sensor is covered by the temperature sensor. The indoor tableware is placed too much and too densely, resulting in too much temperature difference between the temperature sensing device and the surrounding of the heating tube, and the tableware near the heating tube is heated too high; ②too close to the infrared heating tube. It is recommended that the tableware should be placed more than 10 inside the heating tube. Reason 4. is not resistant to high temperature, leading to national standard requirements: the high temperature of the two-star disinfection cabinet should be greater than or equal to 120 degrees Celsius, and the duration should be greater than or equal to 15 minutes. For different product models, the instructions will indicate which temperature-resistant tableware is suitable for the upper and lower layers. For example: tableware with a temperature resistance of less than 75 degrees Celsius should not be sterilized and dried with this product; tableware with a temperature resistance of less than 180 degrees Celsius can only be placed on the upper layer, and the tableware should be more than 100 mm away from the heating tube; the temperature resistance is 180-250 The tableware in degrees Celsius can be sterilized by the lower layer, and the tableware should be more than 100 mm away from the heating tube during disinfection; ceramic tableware that is not resistant to high temperature will react with the enamel on the surface of the tableware after high temperature disinfection, which will cause yellowing and discoloration, especially Some tableware with bright colors and more pigments. According to the above related reasons, in our daily use, pay attention to the water used to clean the ceramic tableware, purchase qualified detergent and high-temperature ceramic white porcelin dinnerware, drain the tableware before placing it in the disinfection cabinet, if you can use a clean dry towel Dry the water first, the effect will be better. When placing the shelves, follow the shelf arrangement and keep a smooth heat conduction space inside. Note that the distance between the tableware and the heating tube should be more than 10cm. This use can effectively avoid the yellowing of the ceramic tableware.

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