Views:266 Author:Site Editor Publish Time: 2019-07-22 Origin:Site
Elastic nylon yarn is a polyamide filament that undergoes physical processing such as high-speed twisting and high-temperature setting to produce elastic fibers. It has the characteristics of high strength, good wear resistance, light weight, good fabric fullness, beautiful appearance and hairy feeling. Therefore, it has developed rapidly in recent years and has been widely used as a textile raw material.
The dye selection of elastic nylon yarn in dyeing is the same as that of other fibers, not only from the aspects of dye leveling and vividness, but also the fastness after dyeing. Neutral dyes or acid dyes or acidic, neutral complex dyes are preferred, wherein red dyes can be used as reactive dyes, and dark greens can be used as direct dyes, such as direct dark green B. If you want to get excellent fastness, you must also distinguish the dyes and strictly control the amount of dyes.
In the dyeing of disperse dyes, the dye dosage can be controlled within the following range, and the fastness can reach three or more levels.
When dyeing with neutral dyes, some dyes should be light-colored or dark-colored, and should not be fixed after dyeing. Its color fastness is also very good, such as: Liner heart brown RL, Lena heart Gray BL, Lena Heart Blue BL, Pula Dark Blue B, Karp Absolute Green 5GS, Neutral Grey 2BL.
Some neutral or acid dyes, when dyed in light and medium colors, do not require fixing treatment after dyeing, and their color fastness is also good. However, when the dye is used up to the following limit, after dyeing, it must be subjected to fixing treatment to achieve color fastness of three or more levels.
According to the current popular horizontal and vertical jet dyeing machines and liquid dyeing machines, as well as dyeing machines such as dip dyeing machines, the dyeing of elastic nylon yarns is preferably an upright jet dyeing machine. Regarding the finishing equipment, such as the wire opener is designed according to the special state of the elastic yarn. In fact, due to the tight arrangement of the dyeing and silking, the impact of the dyeing liquid on the silk is minimized, the silk fiber is not damaged, and the other is On the one hand, because of the high strength of the nylon yarn itself, the effect of finishing with a wire opener is not significant, but in terms of knitting yarn, in order to make the yarn slack, it is still popular to use a wire opener.
Dyeing liquid circulation problem, according to the structure and operation of the vertical jet dyeing machine, the flow direction of the dyeing liquid dyed by elastic nylon yarn is better in the direction of single inner jet, because the dyeing penetration of this fiber is better than other fibers. good. If it is sucked out by suction, it tends to cause the tow to be inserted into the eyelet of the nozzle, causing the yarn to be disordered and damage the silk.
The process of softening and drying after dyeing is handled according to the use of the yarn. Generally, the softness of the knitting yarn is higher than that of the woven silk because the chance of contact with the machine is better than that of the weaving. Since there are many wires, the knitting yarn must be softened after dyeing, and the woven yarn can be reduced or not softened.
Regarding the drying problem, since the water absorption rate of the elastic nylon yarn is relatively small, it is easy to gene rate static electricity. Therefore, it is extremely difficult to dry at a high temperature, and it is suitable for natural drying. Generally, if the water content after dehydration is 20% or less, it may not be dried. Directly turn over, weaving, if dyed, the subsequent process can not be temporarily connected, it needs a period of storage, can be dried for 8~24 hours, and then packed for use.
Due to the difference in fiber content, the amount of dye absorption is different when dyeing. According to the test results, when the same dye amount is dyed, the fine fibers are shallower than the coarse one, and the monofilament is deeper than the multifilament fiber. Therefore, when dyeing, the sample should be prepared in advance to prevent the drawbacks in dyeing.