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                Technical Analysis of Color Dots and Color Spots Produced by Dyeing Polyester Knitted Fabrics with High Temperature and High Pressure Dyeing Machine

                Date:2018-03-06Source:Shaoen Machinery
                ? ? ? ? There are two kinds of color spots and stains produced when high-temperature and high-pressure dyeing machines dye polyester knit fabrics:
                ? ? ? ? One is the color spots and stains caused by dye agglomeration, which can be repaired with a repair agent or stripped and then re-stained; the other is due to the generation of oligomers in the fibers that make it difficult to remove the color spots and stains.
                ? ? ? ? 1.1 The reasons for the color spots and stains produced by oligomers
                ? ? ? ? Oligomers are also called oligomers. It is a kind of low-molecular substance with the same chemical structure as polyester fiber existing in the polyester fiber. It is a polyester by-product of the polyester spinning process that contains 1% to 3% of oligomers. Most of the oligomers are cyclic compounds formed from 3 ethyl terephthalates when the temperature exceeds 120°C. The oligomers can be dissolved in the bath and crystallized out of solution. Combined with condensed dyes. When cooled, it deposits on the surface of machinery or fabrics to form stains, color spots, etc. Disperse dyes are generally kept at 130° C. for about 30 minutes to ensure dyeing depth and fastness. Light color can choose to keep warm at 120 °C for 30 minutes. Dark color must be pre-treated before dyeing. In addition, staining under alkaline conditions is also an effective method to solve the oligomers.
                ? ? ? ? 2.2 Causes of color spots and stains due to dye aggregation
                ? ? ? ? 2.2.1 Pretreatment
                ? ? ? ? ?Generally considered. The pretreatment of cotton knitted fabrics has a great influence on the dyeing quality. The emphasis on polyester dyeing is not enough. Slightly treat with a poor degreaser or do not handle direct staining at all. Dyeing quality problems are suspected and operators are not expected to operate properly. In fact, polyester is a by-product of raw material production and an oil agent in the weaving process. Dyeing quality problems can easily be caused. Such as color flowers, color, color, color spots, etc., so must be processed before dyeing. Select the appropriate oil removal agent to warm up to 90°C and keep warm for 10 minutes.
                ? ? ? ? ?2.2.2 Selection of dyes and additives
                ? ? ? ? ?A improper choice of dye
                ? ? ? ? ?When generally dark dyed. Due to the high temperature dyeing conditions of dye particles, the chance of thermal collision increases. Dye molecules tend to re-agglomerate to produce stains and color spots: At the same time, the use of a large amount of filler used in dyes can cause color spots and color spots.
                ? ? ? ? ?Inappropriate selection of B additives
                ? ? ? ? ?Poor quality dispersants condense on the surface of the fabric together with the impurities in the fibers and the dyeing jars at high temperatures to cause color spots and stains: different ionic auxiliaries are easily reacted to form demulsifiers. In order to form a precipitate on the fabric. Produce color spots, stains
                ? ? ? ? ?2.2.3 Fabric quality and fabric capacity
                ? ? ? ? ?When staining in the same stainer. High quality knitted fabrics are structurally tight. Dyes are not easy to enter inside the fiber. Knit fabrics with a mass of 300 oz. or more are more prone to produce spots and color points than those with 200 g/m2. When there is too much cylinder cloth. Poor operation, but also easy to produce spots, color points.
                ? ? ? ? ?2.2.4 bath ratio
                ? ? ? ? ?Dyeing bath ratio is small. Dye particles in the high-temperature high-pressure dyeing machine in the relatively high probability of thermal collision, easy to produce stains, color points.
                ? ? ? ? ?3. Measures to prevent color spots and stains
                ? ? ? ? ?3.1 100% of the fabric used before dyeing
                ? ? ? ? ? NaOH3%。Surfactant detergent 100%. Treat at 130 °C for 60 min. The bath ratio of 1:10 to 1:15 used a dyeing pretreatment method to erode polyester fibers. But it is extremely beneficial to remove the oligomers on polyester filament fabrics to reduce the "Aurora". Pairs of short fibers can improve pilling and pilling
                ? ? ? ? ?3.2 Control the dyeing temperature below 120. Use the proper addition of the vector staining method. Can reduce the production of oligomers. The same dyeing depth can be obtained
                ? ? ? ? ?3.3 Add dispersing protective colloidal additives when dyeing. Can produce leveling effect. It also prevents oligomers from depositing on the fabric
                ? ? ? ? ?3.4 After staining. The dyeing solution was rapidly discharged from the machine at a high temperature. Draining time up to 5rnin. Because the oligomers are evenly distributed in the dyeing solution at a temperature of 100-120°C. When the temperature is below 100°C, it easily accumulates and precipitates on the dyeings, but in doing so, some heavy fabrics tend to form folds.
                ? ? ? ? ?3.5 dyeing with alkaline conditions. Can effectively reduce the formation of oligomers. Remove the residual oil on the fabric. However, dyes suitable for alkaline dyeing must be used
                ? ? ? ? ?3.6 After dyeing, wash with reducing agent. Add 32.5% (380Be) NaOH 3-5mL/L. Insurance powder 3 ~ 4g / L, 70 °C treatment 30min, then cold wash, hot wash, cold wash, with acetic acid and.
                ? ? ? ? ?3.7 The bath ratio of high-quality knitted fabric dyeing is 1:10 or more. And select the thicker overflow dyeing machine in the dyeing machine if restricted by the machine. Must be dyed in a small bath dyeing machine. The amount of cloth should be reduced appropriately. Ensure the speed of the fabric
                ? ? ? ? ?3.8 For certain metal ion-sensitive dyes such as Red 3B (Red 60), use soft water for production. Prevent color spots
                ? ? ? ? ?3.9 Strengthen production site management. Specify the correct dye application procedure. Additives and dyes are added separately one by one. It is strictly forbidden to mix dyes and additives without dilution, and the dyes must be filtered before entering the tank.
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