2, for sheets, covers, pillowcases and other light dirt linen, in the washing process when choosing bleaching agent, should choose bleaching powder is not chlorine bleaching powder. Because chlorine bleaching powder is a strong oxygenating agent, it will cause the chemical reaction of impurities in the fabric to produce chlorine, which remains in the fabric fibers and is oxidized in the air by ironing or drying machine, causing the fabric to yellow.
3, in the process of washing, over is very important. When linen is washed, a mixture of detergent and dirt forms in the solution after the dirt is washed off. The mixture also has a temperature. During the process, if it is cooled directly, it will cause the cloth to shrink, locking the dirt of the mixture firmly into the fibers. Over time, the linen will develop dirt deposits.
4, in the washing, can not well grasp the washing procedure, it is also easy to make yellow, gray, hard, so strictly in accordance with the standard washing procedure is quite important, especially class.
Washing linen needs attention:
⑴ Soft agent must be added when the main washing;
The best bleaching powder;
(3) Out of date as much as possible heat transfer washing;
(4) When post-treatment, neutralizing acid powder must be added. Without neutralizing agent for a long time, it will become hard.
⑸ Add soft powder to the right amount, add too much will make yellow;
The ⑹ will turn grey if not completely. To make the linen wash well, each washing procedure should be treated strictly, otherwise, as long as there is a link wrong, it will affect the overall washing effect. The increase of linen by bleaching agent to complete, but must be reasonable bleaching agent. Oxygen bleaching agent is relatively harmful to the fabric, can keep the fabric bright for a long time, but it is not easy to remove some plain stains. The advantage of oxygen bleaching agent is that it can extend the life of the fabric and prevent premature gray. Chlorine bleaching powder has certain damage to the fiber fastness of cotton products (). If used for a long time, the fabric will be gray and dark, but the removal of plain dirt on the fabric is more thorough.
Washing experience, for reference only: Seven days a week of washing, the first four days of oxygen bleaching powder to rinse, after three days of chlorine bleaching powder to bleaching (because all turnover washing less three days), on oxygen bleaching powder or chlorine bleaching powder, when adding the machine, when the temperature reaches 55℃-60℃, will dilute the good bleaching agent in the drum forward and add the blanking, in order to avoid the damage caused by more concentrated bleaching powder to linen. It is best to choose oxygen bleaching powder to increase the washing of the new fabric. The above bleaching type not only reduces the damage of bleaching powder to the fabric, effectively ensures the removal of dirt, and effectively prevents the appearance of gray and dark phenomenon of the fabric.
Linen washing: some hotels, hotel rooms are based on linen, so the degree of attention. If you drift, you can only get a fixed degree. But on closer inspection, there is also light yellow or brown, mainly because the fabric absorbs a small amount of blue light from natural light. Therefore, to make the observation of the fabric, it will be found that there are light yellow or brown, mainly because the fabric has a trace of blue light in the natural light absorption. Therefore, to make the fabric to an ideal state, can be implemented on a regular quantitative increase in linen. There are two ways to implement fabric enhancement: blue enhancement and fluorescence enhancement.
1, add blue - why by adding quantitative blue reaction? Different wavelengths of light produce different sensations. It is normal to see that when the light passes through the prism, it is dispersed into multiple spectral bands. In dyeing and finishing, there is a complement, chacha yellow and blue complement each other. When these two colors are mixed, the feeling can be given, because there is a definite yellow and brown on the fabric, and a certain amount of blue is added to adjust the yellow on the fabric to make it appear. The complementary principle of color, some blue or blue purple disperse dyes, so that it evenly adsorbed on the fabric to remove the yellow or brown, which is the principle of blue increase. When adding blue treatment, different dyes should be selected according to different fabrics in order to achieve the best results. a, direct fast blue: can be used in cellulose fiber fabric, the general amount of 0.006g - 0.003g/l, five minutes. b. Disperse blue dye: It can be blended with polyester and cotton, the amount is 0.005 g/l, the time is 5 minutes and the temperature is 40℃. Before adding, the dye should be fully dissolved and then neutralized. The appearance (degree) of the fabric after this treatment is relatively beautiful.
2, fluorescent enhancer: the invisible ultraviolet light into blue or purple visible light, increase the reflectivity of the fabric, give a clean and pure feeling, fluorescent enhancer is a kind of paint, and fibers have affinity, therefore, adsorption on the fabric fastness and increase effect is good. Often fluorescent enhancers have the following kinds: a, VBL: in cellulose fiber, light yellow powder, but not suitable for negative separation surfactant at the same time. b, DT: light yellow needle, increased in polyester fiber fabric, good chlorine resistance. c, WS: powder, in, cotton fiber, polyester and other fabrics, stable to acid and alkali solution. Each fluorescent enhancer has a specific yellowing value, which will reduce the degree value, so it is necessary to control the amount, temperature and time when using, and use it in the last pass. Fluorescent enhancers cannot represent normal washing and bleaching. If the unbleached fabric makes the fluorescence increase or the blue increase mentioned above, the effect is not good. Therefore, good degree is the basis. After bleaching, the effect of the above method and the above method is obvious.