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Sublimation Transfer Printing Process Principles And Characteristics

Sublimation transfer printing process principles and characteristics
Sublimation transfer printing appeared in the 1930s and 1970s popular in Europe and the United States, Japan and other countries and regions, from historical data, its development process is rather special. Neither as optimists predicted, with amazing share of textile printing is also not as pessimists say, slow growth, or even stagnation, decline it. Sublimation transfer technology in the development of our country relatively quickly wide range of applications. In addition, because of its low investment, pollution, conservation of resources, the effect of outstanding printing characteristics, caused the relevant government departments. Currently, dye-sublimation transfer printing processes have been included in China’s State Economic and Trade Commission in key industries cleaner production technology-oriented directory (first batch) at No. 45 among the country’s prospects very promising.
First, the process principle and characteristics
Sublimation transfer printing is a way by printing special printing dye printed onto the 
sublimation paper, then through the heating / pressurizing, the dye transfer technology to the fabric. Specifically, it is based on sublimation properties of disperse dyes, disperse dyes selected sublimation temperature range of 180 ~ 240 ℃, the slurry was mixed with color inks, depending on the pattern / design requirements. Printed way color ink printed onto the sublimation transfer paper. The printed patterns, patterns of the dye sublimation paper in intimate contact with the fabric, the handle 10 ~ 30s transfer printing machine at 200 ~ 230 ℃, after diffusion into the interior of the fabric, to achieve the purpose of coloring. In addition to the dye sublimation process directed diffusion tend to the floor under the dyed side Sublimation inkmainly from South Korea and Italy imports expensive) applications and the introduction of digital printing technology sublimation transfer technology more increasingly widespread. To sum up, dye-sublimation transfer technology has the characteristics of the following four areas:
1. Good printing results. Uses dye-sublimation technology transfer printed fabric patterns fine, colorful, rich layers and clear, high art, three-dimensional sense, it is difficult to do other methods of printing. And can print photography and painting style pattern.
2. Printing soft, long service life. The most important feature is the sublimation transfer dye can diffuse into the polyester or fibers, printed materials feel very soft and comfortable, feel the presence of a basic ink layer. Furthermore, since the ink had dried in the transfer process, the image of life and clothing as long as life itself, will not affect the fabric printing graphic appearance of wear situation.
3. Simple process. Less investment in equipment, high flexibility authentic. When sublimation transfer printing can be a multi-color pattern without having to spend, and can print jobs in a short period of time according to the customer’s individual requirements.
4. Saving and environment-friendly resources. Different from traditional textile printing, dye-sublimation transfer printing without steaming, washing and other post-treatment process, saving a lot of water, but no sewage, saving resources and protecting the environment.
Two quality factors
(A) ink
Sublimation ink sublimation transfer technology is the key material is mainly composed of disperse dyes, binders, solvents and a small amount of additives. To dye sublimation transfer and has good permeability. And reach a certain fastness molecular weight of 230 ~ 380, sublimation temperature of 180 ℃ ~ 240 ℃ commonly used dye transfer printing anthraquinone dyes, azo dyes and cationic dyes. Binder to dye affinity is small, easy to dye release gases and have appropriate printability, preservation and thermal transfer adaptability, commonly used binders are low viscosity ethyl cellulose, ethyl cellulose, ethyl Trail (EHEC), long oil modified alkyd resin. Commonly used solvents are turpentine, terpineol, high boiling alcohol, aromatic hydrocarbons, cellosolve.
(B) temperature and time
Sublimation transfer process requirements to control the temperature in the range of 180 ℃ ~ 230 ℃, time is about 10 ~ 30s, keeping in mind a reasonable allocation of temperature and time.
Pressure is also one of the important parameters of sublimation transfer process. The fabric sublimation transfer printing, for example, if the pressure is too small, a large gap between the fabric and transfer paper, yarn round, a lot of ink and air gas molecules Fugitive collision, resulting in poor printing results, but also easy to ink blurs the lines thicker, leaving a pattern, pattern blur visual effect of variation; if the pressure is appropriate, flat yarn was between the fabric and transfer paper suitable gap, the transfer coloring effect, a clear pattern, smooth lines fine: If the pressure is too large, prone to deformation, fluff and heavy fabrics morphological change and other issues, resulting in stubby and coloring superficial shortcomings. Therefore, the control pressure for improved print printed pattern, a clear pattern, visual effects is critical.
(4) Other
In addition to the ink, temperature, time and pressure will affect the quality of sublimation transfer, the actual production of the production process there are some issues worthy of our attention. First is the choice of the transfer paper, stable quality, high credibility of the supplier of choice is printed Enterprise: Secondly, we must realize that in the pre-transfer dye inks (before heating and pressurizing the pattern on the transfer paper) and a transfer after (transferred to the pattern on the fabric) colors vary widely, generally pre-transfer dye inks look dark and dull, relying on high temperature about 200 ℃ restore true color, so that printing proofing is necessary to carry out pre-production : Finally, when the thermal transfer, to ensure that the hot surface of the transfer paper and substrate surface are connected closely, there is no gap, otherwise the transfer may occur graphic blurred.
Three technical breakthroughs
(A) Low cost
At present, gravure printing is one of the main thermal transfer printing paper, printing advantage of this model is simple, flower-type transition level strong sense of three-dimensional nature, the disadvantage is expensive plate {each edition containing version of the base cost for the 3000 ~ 50O0 yuan), the production cycle is longer, so it suited personalized strong, low-volume, variety and diverse production requirements. In order to reduce the cost of plate making cost savings with offset printing, screen printing, flexo gravure become most vendors instead of the development of ideas. With the development of digital printing technology, dye-sublimation transfer is no version to digital direction, sublimation inkjet printing technology enables sublimation transfer printing free version of the objectives are achieved. Sublimation inkjet printing technology refers to small desktop inkjet printer or large-format inkjet wide-format inkjet machine pictorial machine or by sublimation ink and sublimation transfer paper, the pattern or image transfer printing or direct printing material in the end on heat transfer machine and then subjected to solid or solid-color color processing, dye-sublimation transfer printing. This technology eliminates the need to spend a lot of time producing a printing plate so greatly shorten the production cycle, but also saves the cost, widely used in personalized strong, low-volume printing jobs, such as T-shirts, uniforms, advertising banners, mouse pads, mugs, carpet.
(B) Paperless
Paperless heat transfer printing most notable feature is the transfer substrate can be reused. First; regret dye made printing paste, and then by way of printing a pattern printed on a special substrate, and then stick with the fabric through a hot zone. Pattern on the substrate will be transferred and fixed on the fabric to give the finished printing. Traditional transfer technique requires a lot of expensive transfer paper, and the use of new substrate paperless transfer paper thermal transfer technology is eliminating the cost of greatly reduced costs, but also by eliminating the paper and recycling waste paper water and wastewater problems caused for conservation of water resources and protecting the ecological environment has a very positive meaning. Paperless thermal transfer process by the Beijing Institute of Clothing Technology Department of Materials Engineering Laboratory proposed thermal transfer, after nearly a decade of research, made a breakthrough paperless regard. They propose to replace the transfer paper studies have shown that not only can aluminum foil aluminum foil substrates like paper patterns, designs, and can pattern, the pattern is transferred to the fabric, and after the thermal transfer, can be reused. Therefore, a good development trend of paperless transfer printing, paperless technology will get a bigger breakthrough.
(C) make repeat
Contains graphic information is often only transfer a thermal transfer paper, graphic information once transferred to the substrate, it can not be transferred again. For this reason, many studies can be released to control thermal transfer printing technology on paper dyes, dye transfer quantitatively to achieve multiple transfer printing has become the subject of many scientific institutions. Efficient use of multiple transfer printing can be relatively expensive thermal transfer paper saves transfer costs. Domestic professionals in a number of technology transfer has been a breakthrough, Donghua University Chemistry and Chemical Engineering Luo Yan et al., Using microencapsulated disperse dyes for transfer printing technology research. The use of microencapsulation technology wrap disperse the microcapsules may be viewed as a small warehouse dyes, controlled release properties (i.e. sustained release), every time it is transferred release an amount of dye transferred several times to reach a constant color effect, in order to achieve multiple transfer purposes. Studies have shown that the disperse dye sublimation transfer ink content determinants of the number of transfers, and high levels, the number of transfers and more content is low, the transfer times less. Ink Materials and Chemical Engineering, in cooperation with the Tianjin-Hing Ink Co., Ltd. developed the content of disperse dyes Tianjin Polytechnic University, up to 40% ink transfer 21 times, the optical density of the sample is still up to O. 62 were able to meet the quality requirements of the transfer.
In summary, dye-sublimation transfer printing process technological breakthrough will be very beneficial to our fabric dyeing and printing industry in the application, especially sublimation inkjet printing technology, will become personalized strong, short cycle, low-volume, variety the preferred method of printing live parts. This article identified by the China Network collected more information, please visit Logo Business School.