subject: Pressing Fixing Reactive Dyes Process Practice - Reactive, Pressure Hot - Especially Indian Silk [print this page] Now printing products throughout the printing and dyeing products accounting for about 25%, printing of new technology and new equipment continue to emerge. Special printing a little glue (epoxy), Transfer ( Heat Transfer ), Bronzing, hot silver, gold and silver powder, luminous, three-dimensional printing, sticky beads, etc., printing equipment used screen Printing machine , Transfer printing Machine, flocking printing machine, digital jet printing machines, Pressing Machines. Pressing machine, with the T shirt transfer printing technology and development of the industry and developed.
As people-oriented, sustainable development concept deeply rooted among the eco-textiles for the growing consumer demand, printing and dyeing enterprises in the manufacturing process required to adopt environment-friendly reactive dyes printing. Reactive bright color, easy to use, chromatography is complete, good fastness, soft, solid color, printed more than fixing by steaming process, which for lack of steam equipment companies use the technology will be limited. Therefore, reactive dye printing methods and printing technology research and improvement, it will have an important significance. T-shirts printed on the case by using the hot press method of fixing reactive dyes for the new Technology Practice.
Process Graphic design Photographic plate / modulation paste printing drying pressure hot water washing fixing cold hot water soaping cold water washing drying ironing and finishing.
Equipment Requirements Manual pressure hot machine is primarily used in heat transfer printing and heat transfer, is widely used in T-shirts, bags, handbags, shoes, hats, socks, gloves and other designs. Pressing machine size of 40 60cm, the maximum temperature can reach 399 , the maximum adjustable time to 60s. The longest time because the equipment is only adjustable 60s, so, dye fixation must be rapid in a short time.
Dyes Dyes are reactive dyes, dyes of the types of X type, ME type, KN Type, K type, etc., present in the international and domestic have received wide attention, and have continuously developed new dyes and applied to production so that fixation be greatly enhanced. Reactive chromatography is complete, application, and soaping fastness, abrasion fastness, meet the T shirt in the course of the regular washing to need a good soaping fastness requirements. As with the reactive dye printing, should have high solubility and high solid color, low direct, good stability, good light fastness and resistance to washing fastness, good compatibility and repeatability. Good stability in the choice experiment ME-type, KN type and K type reactive dye process carried out experiments. As the printing process are higher, and should choose the high rate of dye fixing.
Paste composition Reactive dye printing paste usually, resist salt S, urea, sodium alginate paste, a small soda (or soda), water composition, use of steam fixation. As a result of pressure hot fixing the time is short, the choice of the alkali agent, consider increasing the alkaline, reducing fixation time, increase fixation. To this end, experiments used ME-based, KN type dye colorant selected Soda, K type reactive dye colorant selected soda ash, caustic soda, paste composition of dye, sodium alginate, sodium carbonate (or soda) and water.
Recipe using reactive dyes: 1% ~ 10%; alginate paste (6%): 60%; soda ash: 2%; or sodium hydroxide (36 Baume degrees): 4ml/100g.
Process prescription and the choice of process conditions Pressure hot temperature to determine
With cotton twill weave fabric bleach, select the activity of black KBR, activity and activity of black KNB Red M-3BE, time for the 60s were conducted comparative experiments show that with increasing temperature, fixation rate, color significantly deeper; when the temperature at 190 and above, the fabric began to turn yellow. Therefore, the proposed maximum control pressure hot temperature 180 .
Pressing time determination 1) KBR reactive black dye used to caustic soda as the alkali agent in the temperature of 180 , the experiment proved that when the time is less than 40s when, with the growth experiments, color was deepened, over 40s, over time growth, significantly lighter color.
2) Reactive Black KNB dye used to soda ash as the alkaline agent, at a temperature of 180 , the experiment, when the time less than 40 seconds, with the growth experiments, color was deepened, more than 40 seconds, with the time of growth, marked reddish shade.
Selection of alkali Reactive black dye used
KBR, the temperature is 180 , time for the 40s to experiment, that alkaline increased significantly deepen the color. However, the application of caustic soda in the dye concentration is high, the pH value of more than 11 color paste to paste unstable and form a gel. Choice recommend alkali soda.
Experimental analysis Seen from the above comparative test, pressure hot fixing method to play the role of reactive dyes, color fastness and very good solid, white, and does not stain, not paint and logo is attached to the fabric as the surface dye penetration into the fiber, touch feel good, wash, wear. Pressing the process but to pay attention to temperature and time control, temperature increase, fixation rate, as the temperature increase and deepen the color, but the temperature exceeds 180 , the fabric began to turn yellow, showing that this temperature is not appropriate. Fixation rate also increased with time and the color will deepen. During the experiment, we found that dye Pressing law requires rapid fixation within a short time, also the longest 40 seconds, than the steaming method greatly reduces the time and energy. Pressing reactive method has its advantages and shortcomings of course, reactive dyes on the dark poor reach the end of the fabric covering the effect of color saturation. This method is only suitable for shallow fabric, if it is not obvious dark color fabric printing. Reactive hot pressing method proved feasible by experiments, which filled the dyes in clothing, hand-cut pieces on the screen for the new technology of printing platen.
Effect of process
Reactive hot pressing method of fixing to avoid the use of steam of reactive printing solid colors as condensate drip stains, reactive hot pressing method is simple and does not need fixing heavy machinery equipment, only manual pressure hot machine can, it is simple, flexible, process short, solid-color high bright color without the addition of urea resist salt, reducing agents and dyeing auxiliaries consumption, lower printing costs, energy and water conservation. At the same time, reactive dyes have few structures containing harmful aromatic amines, making it the production of cellulose fiber of choice for eco-textile dyes, fabric feel good, fabric washing fastness, rubbing fastness is good, fabric printing process by the tension and pressure hot fixing method is particularly suitable for small printing businesses, such as T-shirts and clothing printed pieces
