How To Make Hotel Linen White As New?

Most of the linens used in the guest rooms of hotels and restaurants are mainly white, so the hotel staff attaches great importance to the whiteness of the linen in the guest rooms. If only bleaching is used, only a certain degree of whiteness can be obtained, but if you observe carefully, you You will find that there will be light yellow or brown on the linen. This is mainly because the fabric itself absorbs a small amount of blue light in natural light. white. So, how does the white linen look as white as new?

Purpose Of Bleaching

There are two main purposes of bleaching in the washing process. One is to remove the remaining dirt on the fabric that needs to be removed through oxidation or reduction so that it can achieve the original color of the fabric itself; The whiteness and brightness of the fabric make its color more bright and gorgeous.

Fabrics in the washing process (such as towels, bed sheets, tablecloths, etc.) go through rinsing, pre-washing, and main washing processes. Under the condition of reasonable program feeding, general conditions such as water-soluble dirt, oil-soluble dirt, and some solid dirt are fine. remove. However, for some pigmented dirt, special dirt that can only be removed by oxidation and reduction, conventional washing cannot be completely removed, and a bleaching program must be set during the washing process to achieve complete removal of dirt.

The length of time in the bleaching process is related to the release time of the bleach. In the ideal bleaching temperature and ideal pH value of the lotion (pH value 10.5), the bleaching agent is basically evenly dissolved in the lotion when the bleaching agent is added for one minute. At this time, the available chlorine is evenly released, and the chlorine is basically released in 6-8 minutes. At this time, the concentration of available chlorine in the solution is 10 ppm. The content of available chlorine should be lower than 10 ppm when draining water, so prolonging the bleaching time after the release of available chlorine is no longer effective.

Bleaching Time Setting

In the bleaching process, temperature is very important to the bleaching effect. In the bleaching process, oxygen bleaching or chlorine bleaching is used for bleaching, and a reasonable application can be selected according to the characteristics of the fabric to be bleached and the color of the fabric.

Effect Of Bleaching Temperature

The temperature during bleaching is very important for chlorine bleaching. Increasing the temperature of the bleaching liquid can increase the bleaching speed and shorten the bleaching time. In general, increasing the bleaching temperature by 10°C can shorten the bleaching time by one time. If chlorine bleach is used for bleaching, the bleaching temperature is generally selected below 65°C, otherwise, the fabric will be stained yellow and the fastness will be reduced. If you use an oxygen bleaching agent, you can choose 70 ℃ ~ 90 ℃ as well.

PH Value Of Bleaching Bath

The pH value of the bleaching bath has a great influence on the damage to the fabric's fastness. When the pH value of the bleaching bath is neutral 7, the damage to the fabric is serious. The bleaching speed is very fast under acidic conditions, but the damage to the fiber is serious, so it is not recommended to use it under normal circumstances. The optimal pH value of chlorine bleaching is about 10.2-10.5. In this case, the bleaching speed is average, but the damage to the fiber is small. Generally, the main washing and rinsing can be designed at the same time, which can not only maintain the pH value but also reduce the damage to the fiber. Achieve bleaching effect.