After Operating A Washing Factory For So Many Years, Do You Really Understand The Washing Process?

- Aug 22, 2020-

Linen washing is a meticulous job. There are many bosses. The washing factory has been open for several years, but many operations and washing processes are still unknown, such as: linen pre-washing, water neutralization, softening, deliming and bleaching.

After the fabric passes through the main washing and bleaching, the washing comes to an end, but in order to make the clean fabric need to be chemically treated according to different purposes to meet the people's best use of the fabric, it needs to be treated after washing. . The post-washing treatment includes six processes: watering, softening, neutralizing, whitening, sizing and dehydrating.


1. Over water

Whether it is household laundry or industrial laundry, the overall washing quality must be guaranteed. In addition to the control of the main wash and the supplement of bleaching, the over-water link should not be ignored.

Generally, in the washing process, in order to maintain a sufficiently large concentration gradient between the water and the washing residue contained in the fabric to be washed, and to improve the water passing efficiency, a high water level is usually used. The number of times of water passing is closely related to the performance of the fabric and the performance of the detergent used. Pure cotton fiber has excellent water absorption performance. During the washing process, it absorbs many times more lotion than others. The same cotton fiber fabric has different water absorption properties due to different structures. Green towel fabrics are better than plain weave structures. Cotton fiber fabrics have excellent water absorption properties. For fabrics washed with detergents containing a large proportion of alkalis, because alkalis have poor rinsing performance, relatively many times of water are required. Experimental data shows that a 50 kg washing machine After the towel is washed with high water level, the towel contains 16.7% of the residual lotion after the first washing, 3.23% after the second washing, and 0.108% after the third washing , After the fourth pass, it was 0.0117%. Therefore, 3 to 4 passes are generally applicable to most fabrics.

After the main wash, the fabric needs a certain amount of thermal energy to pass the water, but there is a principle to choose the temperature, and the water temperature should be reduced in proportion to each time. For example: the main wash temperature is 80%, then the first water temperature is 70%, the second water temperature is 55%, and the third water temperature is 35%.

When using high water level, the time should be 1.5-3 minutes, the time of washing machine under 50 kg class can be 1.5-2 minutes, and the time above 50 kg can be 2-3 minutes. Dongguan three-legged cat linen detergent manufacturer


2. Soft

After finishing the main washing and bleaching, for some comfortable, soft and fluffy fabrics, it needs to go through the softening process after washing to achieve the purpose.

Softness: After the main washing and bleaching of the fabric, although it has achieved good cleanliness, it is not very soft. The softening process is to use a softener, which is dispersed in water and has a proper affinity for the fabric to make the fabric fiber And the process of internal smoothness to a good state, softness, fluffy and antistatic effect,

Softening process: When the fabric is passed through the water for the last time, add softener from the feeding port when the water temperature reaches normal temperature 20 degrees, and keep the water level soft and wash for about 5 minutes.

Softness requirements: when softening, it should be used strictly according to the amount specified in the softener product description. Excessive use will cause fabric dyes to change color. At present, softeners are all cationic softeners and must not be used together with fluorescent whitening agents. The time must be alternated.


3. Neutralization

Dongguan three-legged cat linen detergent manufacturer, due to the alkalis, chlorine and calcium substances contained in the washing liquid during the main washing and bleaching, when it is heated and treated with water. Due to the influence of washing machine and other factors, it cannot be absolutely guaranteed that these substances will not remain in the fabric, which will cause the white fabric to turn gray or yellow, affect the color vividness of the colored fabric, and make the fabric feel hard. In order to eliminate these remaining substances, it is necessary to carry out the washing treatment process of neutralization. The neutralizing acid agent is used to reduce the alkali substances, so that the pH value of the fabric surface is maintained between 5.8-6.5, and a comfortable feeling is produced. Neutralization removes calcium oxide and calcium chloride, while whitening the fabric to achieve a soft feel. At the same time, adding neutralizing acid when passing water will reduce the number of times of water passing and save energy.

Neutralization process: the second or third pass of water, when the water temperature is 30 to 40 degrees, add an appropriate amount of neutralizing acid from the feeding port, and wash for 3 to 5 minutes.

Requirements: The amount of neutralizing acid is generally controlled at 0.2 to 0.3%. In actual operation, it is necessary to test the pH value of the lotion after washing with neutralizing acid to ensure the exact amount of acid in it, so as to avoid heating and cooling of the fabric to corrode equipment and adhesion of the fabric after drying.


4. Sizing


Dongguan three-legged cat linen detergent manufacturer, the paddle step is mainly for tablecloths, napkins, some uniforms and other cotton fabrics or mixed fiber fabrics in the catering industry. The sizing treatment can make the surface of the sizing fabric stiff, prevent the fiber from fluffing, and have a good look and feel. At the same time, it also provides a protective layer on the surface of the sizing fabric, which prevents the penetration of dirt to a certain extent, and can also make the sizing fabric due to The bonding effect of the sizing agent can give the fiber a certain strengthening effect, and it can play a certain role in extending the service life of the fabric.

When the fabric is sizing, due to the wetting and penetration of the slurry, the relative slippage of the fiber when subjected to external forces is prevented, and due to the cohesion and absorption and diffusion of the slurry itself, the wetting and penetration of the slurry makes the slurry and the fabric The bonding ability between the fibers will form a firm layer on the surface of the fabric when subjected to a certain amount of heat. Dongguan three-legged cat linen detergent manufacturer

There are many types of sizing agents. In view of the characteristics of fabric fibers, the frequently used sizing agents should have the following characteristics:

1. It has high cohesive force and certain adhesive force, which can form a layer on the fiber surface.

2. Has a certain ability to enhance fiber strength

3. It is easy to wash off and there should be no peculiar smell

4. After sizing, the surface color of the fiber fabric will not be affected.