How to thoroughly wash away dirt in hotel linen washing?

The linen washing in hotels and restaurants is a large-scale and high-quality work. Not only should the dirt on the linen be thoroughly washed off, but also the service life of the linen should be prolonged. In order to achieve the ideal effect, scientific washing methods and reasonable washing procedures must be adopted. Through years of exploration, I have a deep understanding of the washing time, the type and dosage of detergent, the washing water level, its temperature and PH value in each step of linen washing. Now I will introduce these to my colleagues for further discussion.

First, flush

Washing is the first step of washing. Its purposes are: firstly, wetting flax and expanding fabric fibers are beneficial to washing away dirt and removing it; The second is to use water and mechanical force to wash away the water-soluble dirt in the washed linen as much as possible to reduce the consumption of detergent in the process. This process does not need any dosage, and can be realized only by using the washing program, which is very important for the following steps and reducing the washing cost. At present, many laundry rooms do not have washing water, or think that washing water is only used to wet linen. So the linen drained as soon as it was soaked. In fact, at this time, the linen has not been fully soaked, and it is impossible to achieve the purpose of removing water-soluble dirt and dirt adsorbed on the surface by flushing. Therefore, it is not advisable not to rinse or only soak linen.

The flushing water level should be medium. Many flushes use high water levels. Practice has proved that although the high water level is more sufficient, it will weaken the mechanical effect of excessive water on the rotation of washing machine drum, and will not form enough water impact force, which will affect the flushing effect. If you choose the middle water level, you can improve the impact of water and give full play to the mechanical function of the drum. Therefore, it is appropriate to "flush" with medium water level. The washing time is 2-3 minutes, and the water temperature can be set at 30℃-40℃. When the water temperature is too low, the fabric fiber expansion is not obvious, which is not conducive to cleaning dirt. If the water temperature is too high, some dirt will be strengthened on the linen. For example, the dirt containing protein will deteriorate and condense under the action of high temperature, and it is quite difficult to remove it. The flushing frequency is 1-2 times.

Second, pre-washing

The purpose of pre-washing is to loosen the dirt on linen and provide favorable conditions for the core decontamination stage. Because of the tension of water and the law of dirt removal, light water can't wet most dirt. Especially for some heavy and dirty linen, some special wetting agent or detergent with high wetting agent content should be added in this step to wet some dirt, so as to ensure the pre-washing effect. At present, there are not many laundry rooms that can correctly use the "pre-washing" program. Some laundry rooms do not have pre-washing, and some often combine this step with flushing, thinking that flushing is pre-washing; Some do not add pre-washing agent during pre-washing, which has a bad influence on the washing effect. The water level and its temperature time in the pre-washing stage should be the same as that during washing, and the number of pre-washing times is generally 1.

Third, the main washing

Main washing is the core stage of linen washing, and it is also the key step to determine the washing effect. In this process, using water as the medium, the chemical action of detergent, suitable water temperature, time and other factors are closely and reasonably combined to achieve a relatively ideal decontamination environment and peel off the dirt adsorbed on linen, thus achieving the purpose of removing dirt and cleaning linen. This is a complicated reaction process. In this process, the design of main washing program and the selection of detergent are very important. In the main washing process, detergent should be selected according to the dirt of linen, and washing time should be designed according to washing temperature and pollution degree. The water level in the main washing stage is usually low to improve the concentration and effectiveness of detergent. The washing temperature is 62℃-75℃. If the washing temperature is too high, the surfactant acting on linen will form colloid, which will affect the decontamination ability of detergent. For pure cotton fabrics, the temperature can be slightly higher. The PH value should be controlled between 10- 1 1.5. The washing time is generally 8- 10 minutes. The time is too short, and all kinds of actions and reactions can not meet the requirements, thus affecting the decontamination rate; Excessive time increases the wear rate and energy of flax.

Fourth, bleaching.

The purpose of bleaching is to eliminate the residual oxidizable or reducible pigments and dirt on flax and purify the surface of flax. If white flax keeps good whiteness, colored flax plays a role in brightening. The effect of flax bleaching is closely related to the quality, pH value, temperature and time of bleaching agent. In the past, it was basically controlled by experience, but now it can be measured, and the use method of bleach can be determined according to the concentration and maintenance time of bleach. In practice, I insist that bleach can only be added when the washing water temperature reaches the set temperature. It can be quickly and evenly dissolved in water to avoid local damage and flower washing caused by uneven distribution of linen. The low water level is to maintain the high concentration of bleach and make it fully play its role. The water temperature is controlled at 65℃-75℃ (note: chlorine bleach), the PH value is generally below 1 1, and the time is generally 6-8 minutes.

Fifth, water.

The purpose of water supply is to make the residual detergent put on the linen in the previous washing procedure and the washing liquid containing dirt diffuse into the water by mechanical force under the condition of high water level, and then discharge it with the water. The stage of passing water is an important link to ensure the quality of washing linen. The water level should be high, the water temperature should be 30℃-40℃, and the number of times of water crossing should be 2-3 times.

Sixth, back office

The purpose of post-treatment is to physically and chemically treat the washed linen according to different uses, so as to meet people's requirements for the use of linen. For example, "neutralization" is to adjust the pH of linen, offset the residual alkali in linen and the sodium bicarbonate, rust and calcium soap that may exist in water, and make it closer to the pH of human skin, thus increasing the comfort of use. Post-treatment processes include softening and sizing. Water temperature: generally about 30℃, and the PH value should be controlled between 6.5 and 6.5.

Seven, dehydration

Dehydration is the last step of flax washing. With the high-speed rotation of the washing equipment, the moisture content in the washed flax is minimized. Time: 8- 10 minutes is generally appropriate.

To sum up, the standard linen washing procedure and method is the organic combination and dialectical unity of chemical action, physical action, time, temperature and water, and finally achieves a balance. Only by using a scientific and pragmatic attitude and constantly exploring and summarizing in practice can we continuously discover, improve and make progress.

Shenzhen Xiangxing Washing Co., Ltd. specializes in cleaning sheets, clothes and towels. There are professional disinfection and isolation workshops, dry and wet washing workshops, ironing and laminating workshops, sorting and packaging workshops, etc. Adhering to the business philosophy of high quality, considerate, safe and fast, our company specializes in laundry, linen washing, uniform cleaning, towel cleaning, quilt cover cleaning, work clothes cleaning and hotel linen cleaning services. Xiangxing Washing pays attention to market innovation, people-oriented management, pursues sustainable development, and realizes the balance of interests of enterprises, customers and employees and the progress of * * * *.