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A Professional Supplier for One-Stop Purchasing of Star Hotel Linens Supplies.
At present, the common water washing process for linen is mainly carried out in the case of high pH. In this paper, the pH value control of linen after the main wash is analyzed in the rinsing and process procedures in order to discuss the quality of linen washing and to ensure that the linen is washed for the consumer's personal health and safety.
Factors that make the pH value of flax so high
The main washing of the linen washing process generally uses an alkaline detergent for cleaning and washing. During the washing process, from the point of view of linen protection, the best pH value is 6-8, but in order to improve the degree of cleaning linen, the pH value is usually kept between 8-10, which is not suitable for cleaning heavily soiled cloth, grass, the value of The pH is between 10 and 12. Both basic washing and rinsing are carried out in an alkaline solution, and if strong washing powder is added, the alkalinity of the washing solution is high, and the pH value is greater than 10, until it reaches 12-13. After washing the linen three times, the pH value of the aqueous solution remains above 7.5. If it is dried or ironed directly, the water will evaporate and the alkali concentration will be higher, which will directly cause the pH value of the flax to be very high.
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Effects of high PH of linen
1. The effect of high pH on the human body
The mixture of sweat and fat secreted on the surface of human skin has been tested and identified: the PH value of oriental skin generally ranges from 4.5 to 6.5, which are urea, uric acid, salt, lactic acid, fatty acids, free fatty acids and neutral fats secreted by human skin. acidity of the mixture. Because there are a lot of acidic substances on the surface of the human body, the average PH value of the skin is 5.75, which is a weak acid. It can prevent the intrusion of bacteria on the surface of the body, this bactericidal ability is called self-purification of the skin. The skin is alkaline, not only bacteria are easy to multiply, but the resistance to irritants is also reduced.
Detergents that have a strong alkaline residue remain on the linen, have generally strong degreasing power, and will neutralize the acidic substances of the leather. This reaction can dry out the skin and cause irritation, allergic reactions in humans, some skin diseases, and skin damage. Our skin is weakly acidic, and this weak acid is to protect our skin from foreign bacteria against the skin. If we touch and use flax with high pH value, it will destroy the original self-protective effect of our skin and directly affect our personal health and safety.
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2. Effect of high pH value on linen
(1) Residual effects of alkaline detergents on linen. Although alkaline detergents are safe for the cotton fibers during the washing process and will not damage the flax fibers, alkaline detergents remain in the fibers, making the linen gray and tough after drying or ironing.
(2) Effect of washing water quality. According to the survey, most of the laundry departments (companies) still use surface water, ground water, tap water and other hard water for washing, and hard water is rarely used for washing. Hard water is used for washing with water. Metal ions such as calcium and magnesium are easy to form in hard water and precipitate on linen when the pH value is high, causing white linen to turn gray, affecting whiteness and feel, and making of colored cloth. The grass darkens and loses its luster. Mineral ions such as calcium and magnesium are deposited on the flax, the adhesion to the fibers is very strong, and it is necessary to wash the mineral ions such as calcium and magnesium attached to the flax to make the white flax gray. In terms of conditions, it is very difficult to solve this problem when the linen is not lost.
(3) No metals develop color like iron in the form of minerals in water, but in the form of ions or ionic compounds. If this water is heated and washed with alkaline detergents or rinsed with oxidants, the pH value is relatively high. High will form chromogenic metallic compounds. For example, rust (iron hydroxide) is deposited on the flax and turns into some brown spots, which makes the white flax turn yellow as a whole, and makes the eye color lighter and darker.
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(4) Effect on softening effect of towels. Laxatives generally use cationic surfactants. When using, avoid using poor-quality water (such as water with a hardness of more than 100ppm equivalent to calcium carbonate), and try to wash the residual alkali (high pH value) and ionic active substances of the detergent remaining on the linen to avoid affecting the soft quality. The water is not clear, the water quality is very poor, alkaline detergents and anionic active substances are still present in the towel fibers, which dampens and compensates for the effect of the softeners.After the towel is dried, it will make the towel gray and hard. The soft effect is not good.
It is used for washing with water.Mineral ions such as calcium and magnesium in hard water facilitate the formation of insoluble salts and precipitate on the linen when the pH value is high, causing the white linen to turn gray, affecting the whiteness and feel, making the linen color, darkening color and lose luster. Mineral ions such as calcium and magnesium are deposited on the flax, the adhesion to the fibers is very strong, and it is necessary to wash the mineral ions such as calcium and magnesium attached to the flax to make the white flax gray. In terms of conditions, it is very difficult to solve this problem when the linen is not lost.
(5) No metals develop color like iron in the form of minerals in water, but in the form of ions or ionic compounds. If this water is heated and washed with alkaline detergents or rinsed with oxidants, the pH value is relatively high. High will form chromogenic metallic compounds. For example, rust (iron hydroxide) is deposited on the flax and turns into some brown spots, which makes the white flax turn yellow as a whole, and makes the eye color lighter and darker.
(6) Effect on softening effect of towels. Laxatives generally use cationic surfactants. When using, avoid using poor-quality water (such as water with a hardness of more than 100ppm equivalent to calcium carbonate), and try to wash the residual alkali (high pH value) and ionic active substances of the detergent remaining on the linen to avoid affecting the soft quality. The water is not clear, the water quality is very poor, alkaline detergents and anionic active substances are still present in the towel fibers, which dampens and compensates for the effect of the softeners.After the towel is dried, it will make the towel gray and hard. The soft effect is not good. However, the level of iron ions can only be 0.2ppm, and proper control of the PH value can reduce the mixture of iron ions and laxatives.
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3. Of course, the pH value control can not be too low, because hotel and guest house linen is generally cotton linen, and cotton fiber is not afraid of acid but not alkali, and it is easily damaged by acid. If the pH value of linen is controlled too low, the service life of the towel will be greatly shortened, and the ability of human skin to adapt to acidity is much worse than that of alkaline. The human body has a high pH value.
4. The use of neutralizing acid to control the PH value of linen is also very important, as it can compensate for the defects and defects of the previous washing process, so that the washing can achieve the desired effect.
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Not as long as the desired pH value can be achieved. It is not enough to neutralize with oxalic acid, because in a hard water bath, a precipitate of calcium and magnesium oxalate is formed, which will be absorbed on the flax, making the flax gray, hard and brittle. Using oxalic acid to remove rust is not clean and temporary. This reaction Fe3 + (brown) Fe2 + (light green) is a reversible reaction, the Fe2 + remaining on the flax is dried or oxidized in air or heated to become Fe3 + again. Oxalic acid is toxic, has a corrosive effect on the skin and mucous membranes, and is easily absorbed through the epidermis and mucous membranes to cause poisoning. Therefore, the pH value can only be controlled by adding acidic complexing agents and other rust removal compounds, as well as special acid neutralizing agents that are harmless to the human body.
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