How Did Forged Steel Valves Apply in the Textile Industry?

Glitter

The phenomenon of flashing is apparently the color hue dyed on cotton fiber and nylon fiber is inconsistent, that is, the hue is uneven. The fundamental reason is that some dyed cotton dyes are caused by competition dyeing of nylon. In actual production, the primary and secondary colors can make full use of competitive dyeing characteristics, so that cotton fibers and nylons can be dyed in a more pure color, the hue is flat, and the effect is good. However, it is difficult to dye the three colors (such as army green, iron gray, and brown) to the same hue on two fibers at the same time, and the flash color is serious. This is the most difficult problem encountered in the dyeing of cotton / nylon cross fabrics. The following will introduce some precautions. It is understood that the valves used in the textile industry mainly include traps, special valves for textile machines, and forged steel valves. However, this article briefly introduces some cautions of forged steel valves apply in the textile industry.

Compared with other valve products, the characteristics of forged steel valves are high temperature and high pressure resistance. It has a unique self-sealing design, the higher the pressure is, the more reliable the seal is. Due to the special performance technical characteristics and special working conditions, the products have also formed characteristics that other products cannot replace.

1. Dyes

Generally, dyes for dyeing cotton (such as reactive dyes and direct dyes) have certain competitive dyeing properties for nylon. Choosing new dyes that do not stain nylon can solve the competitive dyeing problem.

2. Auxiliaries

In order to prevent competition dyeing of nylon, special anti-dyeing agent for cotton /nylon cross dyeing can be used.

3. Process

Reactive dyeing is generally fixed at a pH above ll. The acid dyes used for dyeing nylon are usually best dyed at pH 5.5-6.0. That is, dyeing under acidic conditions. The diametrically opposed two process conditions make the reactive dyes that have been dyed on the cotton fiber stripped to varying degrees while dyeing nylon, which brings great difficulties to the color simulation. Choose neutral dyes with milder dyeing conditions instead of acid dyes. The PH value of neutral dyeing is about 6.5, which has little effect on reactive dyes, so that the three-color coloring of army green, iron gray, and brown can get a better same-color effect.

Color flower

The cotton / nylon cross fabric is dyed in medium and dark colors, and the active / acid two-bath method is used for dyeing. Generally, the cotton is dyed first and then the nylon. According to the characteristics of the process, the stage of producing colored flowers can be divided into two stages of dyeing cotton flowers and dyeing brocade flowers.

1. Control of colored flowers at the stage of dyeing cotton

①Pre-treatment

The pretreatment of cotton / nylon cross fabric is opaque, which is the main reason for dyeing cotton flowers. The pre-processing generally adopts the following three methods:

(1) Pre-treatment of roll dyeing machine: it has many advantages of large liquid volume, high rolling liquid temperature, low tension, not easy to produce wrinkles, and good scouring effect However, it should be noted that the temperature in the tank should not rise sharply except for the materials in place to avoid wrinkle defects on the nylon yarn. The temperature must be gradually increased from the first to the second to above 95 ℃. After being constant, the number of treatment channels is more than eight. After unwinding, fully wash on the flat washing machine to ensure the scouring effect.

(2) Pretreatment of cold reactor: its temperature is low, the reaction conditions are mild, and the treatment effect is not as good as that of the dyeing machine. However, if the amount of liquid is increased, the scenting effect can be improved by prolonging the storage and adding a short steaming process. It must be strictly controlled during short steaming, and is not suitable for steaming in crawler boxes, otherwise stacking and wrinkling will occur.

(3) Pretreatment of overflow dyeing machine: this is the traditional treatment method, the effect is more ideal, but the process must be strictly controlled. The temperature must be gradually increased at a rate of 1 ° C / min. The valves before and after the overflow dyeing machine must be moderately controlled, and the cloth speed should not be too fast, otherwise the local cotton fibers of the cotton / nylon cross fabric cloth will rub against the inner wall of the dyeing tank, causing local unevenness of the dyed cloth surface.

2. Dyes

Due to the different affinity of different dyes on the fiber, the difference in the dyeing rate of the dye on the fiber is caused. If coupled with improper control of various process conditions, color flower and cylinder difference will occur. Therefore, when formulating the dyeing process, the performance of the dye must be fully considered, as far as possible, dyes with good dye compatibility are used for color matching, and a leveling agent is added.

①Operation during dyeing

Due to improper operation, such as improper nozzle size, improper adjustment of the size of the front and rear water flow valve switches, etc., the fabric is not flowing smoothly in the tank, blocking the cloth, resulting in uneven dyeing on the fabric. Therefore, the operator adjusts the mechanical equipment according to the fabric specifications and formulates reasonable parameters to ensure that the fabric runs smoothly in the cylinder.

②Control of colored flowers at the stage of dyeing and brocade

(I)The cloth surface has alkali unevenness

The unevenness of the cloth surface caused the inconsistent dyeing of the acid dye on the cloth surface and the color flower. In view of this situation, before dyeing nylon in actual production, neutralize and wash with 2 ~ 3g / L detergent to make the pH value of the cloth uniform and weakly acidic, so as to avoid color unevenness caused by uneven alkali .

(II)PH value

PH value has a great influence on the dyeing rate of acid dyes. When the pH value is less than 3, the nylon will be hydrolyzed and its strength will drop. In actual production, if the pH value is controlled too high, if it is greater than 6, the dyeing will be slow, the time will be long, and it will be insufficient. When the pH value is less than 5, the dye is dyed quickly, and the uneven dyed flowers are easily produced. Therefore, controlling the pH at 5.5 to 6.0 can ensure uniform dyeing. Adding 0.5 ～ 1.5g / L dye stabilizer can reduce the fluctuation of pH value.

3. Temperature

The temperature of the dyeing bath is proportional to the dyeing rate of acid dyes. The higher the temperature, the faster the dyeing rate. Especially when the temperature reaches above 80 ℃, the dyeing rate will be faster, and color flowers are easily produced. According to the temperature characteristics, a heat preservation stage is added during the production of large goods. The light color is 50 ～ 60 ℃ and the heat preservation is 15 ～ 20min. The heating rate is preferably 1 ℃ / min.

4. Chelating and dispersing agent

If the water quality is good, no chelating dispersant is added. If the water quality is poor, 0.5 ～ 1.5g / L chelating dispersant can be added.

5. Levelling agent

Dyeing must be added leveling. 0 5 ~ 2g / L. Nylon levelling agent is zwitterionic and is an amphiphilic levelling agent. It can be combined with nylon to eliminate the difference in affinity of nylon fibers. It has good coverage of nylon dyeing stripes and can be combined with dye relaxation. It has good retarding and migration effects, and does not affect the final color yield. For color-striped fabrics, a nylon leveling agent pre-scouring process can be used. For dyed flowers and fabrics with severe chromatic aberrations, they can be dyed and repaired.

JAZZY was founded in 2005 as a company specialized in the designing and manufacturing of superior high-quality pipe fitting, brass fitting, forged fitting, sanitary fitting, stainless steel ball valve. If you have any interest, please click the following website to learn more.