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时间:2024-03-22 来源:http://www.jnadx.com/


The quality of washing water can affect the graying and yellowing of linen


Because water extracted directly from wells or tap water can carry a large amount of yellow mud or fine sand and dust. After these unfiltered water containing sediment enter the washing machine, it will cause serious pollution to the linen, forming a visual graying, yellowing, and blackening. Due to the presence of inorganic salt ions in water, it poses a threat to the washing effect of fabrics. Calcium and magnesium ions in water, under washing and heating conditions, transform from soluble calcium bicarbonate and magnesium bicarbonate to insoluble calcium carbonate and magnesium carbonate. After they deposit on the fabric, it will cause the washed fabric to turn gray and yellow.


Ferrous ions, also present in a dissolved state in water, can deposit on fabrics as reddish brown iron compounds under main washing heating and alkaline conditions, causing the washed fabric to turn yellow, red, or even light brown. Inorganic salt ions in hard water can also form anionic detergents such as soap, which not only waste washing materials and reduce the cleaning efficiency of detergents, but also easily adhere to fabrics, causing secondary pollution to the fabric. After drying or ironing, the fabric often turns gray and dark, and it is also quite difficult to remove.


At present, filtration equipment is generally installed at the front end of pipelines or reservoirs to purify the water source and improve the cleanliness of washing water, in order to avoid the impact of water quality issues on the quality of linen washing.



The dosage and usage of 02 detergent are incorrect


Hotel linen


Chlorine bleach is a commonly used washing material for fabric washing. Under suitable temperature and pH conditions, chlorine bleach can not only remove color stains and bottoms on linen fabrics that cannot be washed away by commonly used detergents, increase fabric whiteness, but also have a certain antibacterial and disinfection effect. However, the amount of chlorine bleach added should be moderate. If the amount added is too much, or if chlorine bleach is unevenly distributed in the washing solution, it can not only cause the fabric to turn yellow after washing, but in severe cases, it may also cause fabric damage.


In addition, long-term use of laundry detergent fabrics containing fluorescent whitening agents, or excessive addition of fluorescent whitening agents and softeners during washing operations, can also cause the deposition of these materials on the fabric. After drying or high-temperature ironing, the fabric can turn yellow, dark, and black.


03 Operation process will cause the linen to turn gray, yellow, and black


After washing and bleaching, the fabric generally undergoes a medium or high-speed dehydration process to minimize the residual detergent in the washed fabric. Due to the fact that the laundry detergent remaining in the fabric fibers contains both alkaline detergents and dirt that has fallen off the fabric. In order to achieve better washing results, a certain amount of water is needed to dilute the washing solution in the fabric, and through the physical action of the washing machine, the detergent in the fabric and the dirt deposited on the fabric are further diffused into clean water.


This is the purpose of adding water to bleach washed fabrics. In order to accelerate the diffusion of residual detergent in the fabric and dilute the residual detergent as much as possible, high water levels are often used for adding water to washed fabrics, and multiple times are carried out to gradually reduce the concentration of residual detergent on the fabric. In order to facilitate the diffusion of detergent from the fabric fibers and maintain a continuous swelling state of the fabric fibers, the water temperature during water addition also maintains a gradient decrease. Although these operations are empirical, improper operation can cause the dirt in the detergent to re deposit on the fabric, which will inevitably cause the washed fabric to turn gray and yellow.