What are the reasons for the damage of hotel linen?

1. chemical analysis of the reasons for the damage and gray of hotel linen

(1) Hotel linen washing water requirements: pH 6.5-7; The total hardness does not exceed 50ppm and the iron does not exceed 0. 1 mg/l; When manganese is less than 0.05mg/L, calcium and magnesium in hard water are positively charged when washing, forming calcium-magnesium soap, which will be deposited on the fabric, making white plants gray, lose luster and discolor, and even causing fiber brittleness, fracture and low color fastness.

(2) The linen washed in the hotel is unclear, leaving chemicals in the linen fiber. Alkaline chemical residue. Although alkaline chemicals are safe to cotton fibers during washing and will not damage flax fibers, alkaline detergents will remain in flax fibers under the condition of unclear water. Linen will turn gray and harden after drying, and its softness will decrease. As we all know, the use of hotel linen is completely different from tablecloths and sheets. Table cloths and sheets are used under static conditions, while linen is used under dynamic conditions. Frequent twisting requires linen to be soft, and the firmness of linen may be reduced for any reason.

(3) residual chlorine bleach. Chlorine bleach is a strong oxidizing washing chemical. Its bleaching function can remove most of the pigments distributed in the rinsing process, but it will cause some damage to cotton fibers. When the dosage is reasonable, the ph value 10.5 and the temperature are controlled below 70 degrees, which is relatively safe and normal. However, when the dosage and temperature are not properly controlled, chlorine bleach residue will be formed, which is undoubtedly harmful to the fabric. It is best to use oxygen bleaching, which is less harmful to plants. 90% of the dirty linen in the hotel does not need oxidation treatment. Hotel laundry rooms can be cleaned regularly with detergent rich in ions. It can prolong the service life of pure cotton hotel linen, reduce linen loss and save energy.

(4) Neutralizing agent is the chemical used in the last step in the normal washing process, which can neutralize a small amount (≤ 10ppm) of alkaline chemicals and chlorine bleach left in the cloth after the previous washing step and water washing, and dissolve some metal ions in the water. The correct dosage can adjust the PH value of the fabric between 5.5 and 6.5, which is basically consistent with the PH value of the human body and is safe. The fabric will still be in normal service life, but improper use of neutralizer will make the fabric sour, thus reducing the fastness of the fabric.

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2. Physical analysis of the reasons for the damage and graying of hotel linen.

(1) The linen washing time in the hotel is too long. When linen is washed in the water washing machine, most of the time it is constantly rubbing up and down, resulting in rubbing movement, which is an important factor in washing linen. Because dirty linen can't be washed only by soaking in the washing liquid, this movement not only plays the role of washing linen, but also wears fibers and reduces the fastness of linen, so a reasonable washing time is very necessary, which can reduce unnecessary wear and thus ensure the normal washing life of linen.

(2) The dehydration speed is too high (some automatic washing machines are too high, and the dehydration machine is too high). Excessive centrifugal force makes flax cotton fiber loose, just like when we twist flax by hand, the weaving structure becomes loose, which leads to the middle part or the whole flax becoming loose and damaged. Normal damage starts from the side.

(3) When drying, the temperature shall not exceed 80 degrees, and it shall be 80% dry and cooled to 40 degrees with cold air. Some dryers have broken cold air, which will cause excessive drying of linen. Because the wet strength of cotton fiber is higher than the dry strength, drying too dry will reduce the fastness of flax. If flax is baked too hot, it will also cause the fiber to become brittle and the strength of flax will decrease obviously.