Some tips to improve sublimation heat transfer prints
Sublimation transfer process requires temperature control in the 180 ℃ ~ 230 ℃ range, the time is about 10 ~ 30s, while paying attention to the reasonable allocation of temperature and time.
2, Sublimation ink
Sublimation transfer technology, the key material mainly by disperse dyes, connecting materials, solvents and a small amount of additives. Dyes should have good sublimation transfer ability and permeability. And reached a certain degree of fastness indicators, molecular weight of 230 ~ 380, sublimation temperature of 180 ℃ ~ 240 ℃ commonly used transfer printing dye anthraquinone dyes, azo dyes and cationic dyes and so on.
The connection material to the dye with a small affinity, easy to release dye gas, and the appropriate printability, preservation and thermal transfer adaptability, commonly used in the connection material for the low viscosity of ethyl cellulose, ethyl ethyl cellulose (EHEC), long oil modified alkyd resin. Commonly used solvents are turpentine, terpineol, high boiling alkanol, aralkane, cellosolve and so on.
Pressure is also one of the important parameters of the sublimation transfer process. For example, if the pressure is too small, the gap between the fabric and the transfer paper is large, the yarn is round, the ink gas molecules collide with the air and escape, resulting in poor printing effect, while the ink is also easy But the pressure is appropriate, the yarn is flat and the transfer paper between the gap is appropriate, the transfer coloring effect is good, clear pattern, smooth lines Fine: If the pressure is too large, it is prone to deformation, fluff and heavy fabric morphological changes and other issues, resulting in rough and color rendering and other shortcomings. Therefore, the control of the transfer pressure of rotary heat transfer machine on the printed pattern, clear pattern, visual effects and so very critical.
In addition to ink, temperature, time and pressure will affect the quality of sublimation transfer, the actual production process there are some things worthy of our attention.
The first is the choice of transfer paper, quality and stability, high credibility of the supplier is the first choice for printing enterprises.
Secondly, it is important to realize that the color of the dye ink before the transfer (the pattern on the transfer paper before heating and pressing) and after the transfer (the pattern transferred to the fabric) is very different. Dark and dull, relying on about 200 ℃ high temperature to restore true color, so that the production of pre-production proofing is necessary.
Finally, the thermal transfer, to ensure that the hot pressing surface, transfer paper and substrate surface closely close, no gaps, otherwise, there may be transfer graphics blurred phenomenon.
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