How does white hotel linen generally whiten?
2023-12-24 11:09:58
What methods do white hotel linens generally whiten? The linen used in the guest rooms of most hotels is mainly white, so the importance of whiteness is very important. If only bleaching is used, only a certain degree of whiteness can be obtained. But when you look closely, you will find light yellow or brown, which is mainly because the fabric itself absorbs a small amount of blue light in natural light. Therefore, in order to achieve a desired white color of the fabric, the whitening of the linen can be quantitatively performed on a regular basis. Xiaobian takes you to understand the whitening method and precautions:
Light waves of different wavelengths will produce different color perceptions. People with normal color vision can see that after natural white light passes through the prism, it will be dispersed into a multi-colored spectral band. In the study of dyeing and finishing, there is a complementary color, and just yellow and blue are complementary colors. When the two colors are mixed, it can give a white feeling, because the white fabric has a certain yellow and brown color, and a certain amount of blue color is added to adjust the yellow color on the white fabric to make it appear white. Using the principle of color complementarity, some blue or blue-purple disperse dyes are used to uniformly adsorb on the white fabric to remove the yellow or brown color on the fabric. This is the principle of Garland whitening. When performing garland treatment, different dyes should be selected according to different fabrics in order to achieve the best results.
a. Direct Lightfast Blue: It can be used for cellulose fiber fabrics. It is generally recommended to use 0.006g-0.003g/L for five minutes.
b. Disperse blue dye: It can be used in polyester-cotton blending, the dosage is 0.05 g/L, and the temperature is 40 °C in five minutes. Before whitening, the dye should be thoroughly dissolved in water and then used in the water level. The appearance of the white fabric (whiteness) thus treated is relatively beautiful.
(2) Fluorescent whitening agent whitening converts invisible ultraviolet light into blue or purple visible light, increases the reflectivity of the fabric, gives a clean and pure white feeling, and the fluorescent whitening agent is a coating, The fiber has an affinity and, therefore, has good fastness and whitening effect on the fabric.
Commonly used fluorescent whitening agents are VBL: for cellulose fibers, light yellow powder, but not suitable for use with anionic surfactants.
Light waves of different wavelengths will produce different color perceptions. People with normal color vision can see that after natural white light passes through the prism, it will be dispersed into a multi-colored spectral band. In the study of dyeing and finishing, there is a complementary color, and just yellow and blue are complementary colors. When the two colors are mixed, it can give a white feeling, because the white fabric has a certain yellow and brown color, and a certain amount of blue color is added to adjust the yellow color on the white fabric to make it appear white. Using the principle of color complementarity, some blue or blue-purple disperse dyes are used to uniformly adsorb on the white fabric to remove the yellow or brown color on the fabric. This is the principle of Garland whitening. When performing garland treatment, different dyes should be selected according to different fabrics in order to achieve the best results.
a. Direct Lightfast Blue: It can be used for cellulose fiber fabrics. It is generally recommended to use 0.006g-0.003g/L for five minutes.
b. Disperse blue dye: It can be used in polyester-cotton blending, the dosage is 0.05 g/L, and the temperature is 40 °C in five minutes. Before whitening, the dye should be thoroughly dissolved in water and then used in the water level. The appearance of the white fabric (whiteness) thus treated is relatively beautiful.
(2) Fluorescent whitening agent whitening converts invisible ultraviolet light into blue or purple visible light, increases the reflectivity of the fabric, gives a clean and pure white feeling, and the fluorescent whitening agent is a coating, The fiber has an affinity and, therefore, has good fastness and whitening effect on the fabric.
Commonly used fluorescent whitening agents are VBL: for cellulose fibers, light yellow powder, but not suitable for use with anionic surfactants.
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