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With China's sustained economic development, China has become the world's largest wool textile producer. In recent years, an annual import volume of 30 million tons of wool a cost of more than 10 billion dollars, of which 200,000 tons of Australian wool, wool production in the country accounts for about 30%. These products are made only a very small amount of wool exports, while the amount of wool fabric imports has been greater than exports. Thus, China has become the power consumption of wool products. However, in the domestic market except for some Printing Sweater, consumers could barely see the other printing wool textile products. In fact, according to the International Wool Secretariat and the former Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO) survey, printed wool fabric production accounted for a small proportion of production of wool products. Generate reasons for this are complex, but no more than the following: (1) small quantities: a high-end apparel fabrics, printed fabrics are mainly wool needs to be fashionable apparel production, design is much more varied pattern to reflect the personality of a small batch fashion requirements. The most advanced screen Printing machine Adapted to high volume production of high-speed operation, the batch processing of smaller wool fabric for printing, graphic design to go through. Description issued, screen making and other processes, not only the processing time is long, but the cost is not low. Meanwhile, the general printing companies do not have the wool fabric finishing conditions. This limits the production of printed wool fabric. (2) fabric you: as the object of printing processing, wool fabric is clearly much more expensive than other fabrics. In the screen printing process, it is necessary to achieve the accuracy of multi-color pattern of the flowers, it may result in large waste of 5 meters of fabric, this high-speed screen printing machines running very clear. Printing technology in the complex is more serious, such as discharge printing processing. Therefore, with batch processing of the waste and small, making printing difficult to improve the yield of wool fabrics. However, the printing of wool fabrics after all, there is market demand, especially with the rapid development of the domestic economy, the rapid rise of high-end fashion industry for wool printing some very good opportunities. In response to these problems, a good solution is to use digital jet printing technology. A digital jet printing of fabric preparation Before print fabric in preparation for chloride on the print quality has a very important role. Chloride not only increased the depth of color printing, printing to improve uniformity and brightness print patterns, and because chloride to bring the shrink, and improve the pattern definition, the follow-up processing to prevent the deformation pattern. Wool tops continuous chlorination process can be continuous or piece cloth processing, such as the Kroy UnshrinkableWoolLtd. Continuous production, but even most of wool textile printing dyeing and finishing business enterprises do not have this condition. In addition the approach is to use chlorine release agent sodium dichloroisocyanurate (DCCA) gap-type processing. Either way, destroy the wool chlorination scale structure of the surface increased the surface hydrophilicity of wool to improve the paste, or spray Ink Spread evenly in the wool surface, increase the steaming process of the dye in wool dyeing rate and dye content. Chlorination is generally carried out under acidic conditions, the complex chemical reactions occur, such as gaze intently acid oxidation, N-chloramine formation reaction, peptide bond cleavage reactions. These chemical reactions produce a lot of strong anionic groups, such as: R-SO-3, R-SHJ-3, R-COO-, and polarity of the groups R-SH, R-NHZ, and accompanied by disulfide bonds and peptide dissociation. Chlorination needs to be well controlled, otherwise, make a serious yellowing of wool fabrics. Style damage, strength damage. Of the bright colors for special requirements or white fabric do bleaching process, oxidation or reduction can be used on the Combination Treatment. Wool fabrics were chlorinated, the apparent color depth significantly increased, the reason is: the role of the chloride, the wool appearance of the cuticle layer removed, the wool of polarity and accessibility to increase, making wool more wet and expansion, greatly enhanced the absorptive capacity of the dye, making the depth of color printing increased by chlorination bleaching again after the apparent increase in color depth, because bleaching, the fabric background whiteness, is advantageous to light reflection so that K / S values increased. Can be seen from the above results, wool fabrics in the former before, fabric after bleaching chloride can improve the apparent color depth of printing. Second, digital ink jet printing For wool fabric digital ink jet printing, the current manufacturers are not many. Some large companies are mainly foreign production or activity of the acidic ink ink ink selection was mainly based on color yield, shade, color fastness and its nozzle flexibility. 3, digital jet printing formulation of pre-treatment process Pre-treatment process: modulation slurry - padding - drying - rolls (1) paste the selection Pre-treatment component in order to prevent the jet to the fabric dye penetration, and maintenance of printing patterns and access to some of the apparent clarity of color yield, the general method is to dip the fabric a certain amount of rolling or Scraping paste material. (2) acid releasers choice Join different interpretation of the acid, the definition did not significantly change the apparent color depth of both increased slightly. (3) hygroscopic agents on the effect of printing Pre-treatment agent to join the dehumidifying agents such as urea, may play a printed fabric in the steam when the moisture and promote the role of fiber extruded, is conducive to dye spread from the pulp to the fiber, can be seen from Figure 1, The wool fabric, the change of moisture concentration C (Green), M (magenta), Y (yellow), K (black) four-color printing color depths apparent effect was more obvious, thus increasing the depth and color brightness, When the urea concentration increased to a certain extent, the print clarity declined again. (4) rate of rolling over Can be seen from the above results over rolling rate of change in a certain range of color depth apparent on the stamp was not obvious. 4, digital jet printing process A wool fabric printing process requirements, in addition to sweaters and a few woolen, the majority of the thin high-grade fabric, such as varnish, and female clothing then, serge, etc.. The computer to complete the design of pattern completion by computer-controlled jet printing, the need for dyeing and finishing plant with worsted wool fabric to complete the printing process. General process is as follows: Health Maintenance - singeing - (Single boiling) (light milling) - wash it - cook it - chloride - bleaching - absorbent - drying - printing - steaming - wash it - water absorption - drying - in check - cooked Revised - brush - Shearing - steam it - finished. V. Conclusion (L) digital spray We are high quality suppliers, our products such as Hologram Projector Manufacturer , China Laser Light Projector for oversee buyer. To know more, please visits Laser Stars Projector.
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