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News > Dynamic industry > Printing-related operations

Printing-related operations

(1) the relationship between characteristics of nylon fiber printing fastness.
With different natural fibers, nylon or polyester synthetic fibers belong, their basic features are very close molecular structure, water absorption is very small or entirely non-absorbent, and the fiber surface is very smooth. Thus, the printing paste paint can not penetrate inside the fiber, but adhered to the surface of the fabric fibers. It depends entirely on the adhesive fastness (resin) mechanical properties of the fiber surface adhesion and resin film itself. So, nylon or polyester fabric printing fastness far behind natural fibers.
(2) the difference between the impact analysis for water resistance and water repellency printing fastness.
People in life, usually waterproof fabric and water repellency confused. In fact, dyeing and finishing technology, both of which are two different concepts both connections and differences. The so-called water-repellent is not wet meaning, like water on a lotus leaf, the drops can be formed roll, which indicates that there is a strong water-repellent lotus leaf. If the nylon cloth water repellent finish, it will be like a lotus leaf as having water repellency. The so-called water repellency is impervious meaning, such as single-sided adhesive nylon cloth poncho, heavy rain can not permeable. If both do waterproof nylon cloth, and do water repellent finish, you can get with a water repellent, waterproof, windproof, warm and multifunctional products. Typically, waterproof nylon fabric printing is not printed on gummed side, but do not glue printed on one side. Therefore, water resistance of the printing fastness little or no effect, is affecting the water repellency of the printing paste on the fiber surface adhesion. The greater the water repellency, the greater the impact. In the dyeing process, the fabric often used for water repellent finishing agent of organic silicon compound, is precisely the kind used to process Tuomo transfer printing paper from film. One can imagine, printed nylon or polyester fabric water repellency, whether printing fastness to it caused much difficulty. Nylon cloth printing, because different varieties of nylon, dyeing and finishing them, some only had water, some only a water repellent, and some both waterproof and water repellent, and some neither waterproof nor water repellent. So, before printing, the need for actual identification, in order to be treated differently, according to the strength of the fabric water repellency to determine the selection of the printing paste and technology conditions.
(3) Select the appropriate printing paste.
Currently serving as nylon or polyester fabric printing paste, whey mainly water-based printing inks and solvent printing two types. To their resin component, the main polyacrylates and polyurethanes. These two types of resin, can provide an aqueous whey, can be made solvent inks. In the process the application, which is divided into two one-component and two-component. For printing fastness is where solvent ink is better than the aqueous whey, polyurethane polyacrylate is better than the two-component better than the single-component. Thus, the solvent of two-component polyurethane ink fastness best. Of course, in the actual production, we should also consider the issue of labor and environment. Therefore, the choice of printing paste should try to make it practical and feasible.
(4) a reasonable selection of a crosslinking agent.
Crosslinking agents, also known as cross-linking agent, usually divided into two types of water and oil, they can be an aqueous or solvent inks whey blending use respectively. But in practice it is not very strict, for example, the oil and aqueous whey fight cross-linking agent is also feasible and effective to use. In the printing process, the crosslinking agent may occur by itself or with a printing resin crosslinking reaction, forming a huge network structure, thereby enhancing the bond strength of the fabric fibers, and to improve the mechanical properties of the resin film, so that a substantial printing fastness increase. Single component of the printing paste, printing can be directly used, and can also fight together with a crosslinking agent, and the two components of the printing paste, you must use the blending together with the crosslinking agent. It is noted that the amount of crosslinking agent should not be too large, otherwise it will affect the feel of fastness and no benefits. When using oil-based cross-linking agent, formulated to be immediate printing paste ink runs out, if the time in the past, will deteriorate traits, even coagulation failure.
(5) Note that technology and printing operations.
Printing industry production features mostly small-volume, multi-species, multi color, especially some special printing products more complicated. There is currently a lack of uniform industry standards. For printing fastness of nylon fabric is generally hand-rubbing and adhesive tape test method. Hand scrub including dry rub and wet rub (the cloth dipped in water or soap regularly, and then rub destructively) to observe the resin film is broken and can withstand scrub frequency. Currently, the general printing industry production, printing after the drying process, mainly natural drying, low temperature drying and hot air drying or drying at high temperature before baking or hot pressing. These three processes, by drying or drying after high temperature curing or drying process Pressing its printing fastness best, because the high temperature treatment of water or solvent can evaporate, while the ink in each print paste component fully react, but also allows the resin film and fabric fibers bonded more closely, which for improving the fastness, particularly resistant to rub fastness, has an extremely important role. It should be noted, during the high-temperature treatment, to strictly control the temperature and time. If the temperature is too high or too long treatment time, can cause yellowing of white fabrics colored fabrics or thermal dye migration and the emergence of pan-color phenomenon, resulting in damage to the resin film, so fastness decline, collapsing or might even fabric coking. Therefore, before the formal production shall be carried out in all aspects of practical tests to preferred printing paste ink technology to determine a reasonable condition. In addition, the printing operation, the platen printing use, stencil, squeegee shape, hardness and stress, affects not only the surface effect flower shape, but also has some influence on the fastness, the key is to control the proper pulp ink amount, in order to avoid over-thick resin film formed on the surface of the fabric rubbing fastness influence.

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