The laundry industry generally divides the stains on clothing into two categories, which are general stains and special stains.


General stains

That is to say, when people wear clothes, clothes are accidentally contaminated with substances that are difficult to fall off, and traces appear on the surface of the fabric. Normally, there are the following types:

1. Lipid stains
Lipid stains include animal and vegetable oils, waxes, motor oils, and mineral oils, which are belong to hydroxide. Once the fabric is stained, it is not easy to remove. Ordinary detergents cannot be removed, and chemical treatment agents must be used to partially dissolve the stains before washing.

2. Pigment lipid stains
It is fatty substances containing pigments, including paints, inks, colored oils, ink pad oils, ballpoint pen oils, etc. These types of stains are much more difficult to remove than colorless fatty stains. Especially if it is not treated in time after contamination, it will be more difficult for the pigment molecules to penetrate into the fiber and combine with the fiber for a long time to remove.


3. Pigment acid stains
Most of them are various fruit juice stains. Their common feature is that they all contain pigmented acid lipids. The dye is relatively strong on the clothes. Chemical treatment agents should be used to neutralize the organic acid in the fruit juice.

4. Proteins
Includes protein-containing substances such as blood and milk stains. Generally soluble in water, but afraid of high temperature. Once exposed to high temperature, the protein will become a modified protein and will be firmly combined with the fabric fibers, making it difficult to remove.

5. Pigment stains
Pure pigments include various pigments and inorganic substances with pigments. It is difficult to wash off the pigment, especially the pigment on white clothes. It must be removed by chemical treatment or physical treatment with appropriate chemical agents.

6. Other types of stains
These include asphalt, iodine, rust, ointment, etc. Because there are so many types of stains and their properties are different, the treatment agents and treatment methods used in the treatment are also different.

Special stains

Specific stains are caused by poor technical skills during the washing operation, rather than inherent stains on the fabric itself. Moreover, most of the accidents caused by improper handling during the washing process are color problems.

1. When white clothes are mistakenly placed on colored clothes after washing, it will cause accidents called dark color, color matching, printing color or cross color.


2. Some light-colored clothes have parts of dark-colored fabrics. If the colors are not clarified during washing and apply improper operation will result in inter-dyeing of various colors, which will destroy the original color of the fabric surface and cause cross-color problems.

3. When the rinsing is not thorough enough and all kinds of residual liquid (soap lye), residual stains, soap scum, etc. are not cleaned, it will cause stains such as yellow spots on clothes after drying and ironing.




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Post time: Nov-16-2022