Common problems in the washing process of hotel linen
One is that the formaldehyde content of a few products exceeds the standard seriously. The second is that the washing size change rate item is unqualified. The third is that the color fastness item is unqualified. The fourth is that there are many product identification problems.
There are rust stains on the bed sheets (tablecloths). After they are treated with oxalic acid, they are washed in a machine. After washing, it was found that the rust stains had not been removed. Acidification is the last step in the laundry process, and the quality of acid is very critical in laundry products. It can make up for the defects and shortcomings in the previous process, make the laundry perfect and reach the ideal state.
Oxalic acid is often used in some laundry rooms, which is undesirable. In the unsoftened water, calcium oxalate precipitates will be formed, which will be adsorbed on the fabric, making the fabric gray, hard and brittle. Using oxalic acid to remove rust is impure and temporary. This reaction Fe+++ (brown) and Fe++ (light green) is a reversible reaction. After drying, the Fe++ remaining on the fabric will become Fe+++ again after air oxidation. Only when oxalic acid is added with other acidic complexing agents or other rust-removing compounds to form a stable complex or chelate can it be removed.