How to Solve the Problem of Greasy and Dirty Sublimation Thermal Transfer Ink

Sublimation thermal transfer ink includes sublimation offset printing ink, sublimation screen printing ink, sublimation gravure ink, sublimation ink and other products. Applicable to different models.

It is an emerging printing ink. According to the sublimation characteristics of the thermal transfer ink, according to the requirements of different design patterns, the thermal transfer ink is printed on the thermal transfer paper by the printing machine, and then printed with patterns. The patterned transfer paper is in close contact with the fabric. Under the control of a certain temperature, pressure and time, the ink is sublimated in the gas phase and transferred from the printing paper to the fabric. Purpose.

Thermal transfer printing has rich patterns, bright colors, small color difference, and wear resistance and light resistance, so sublimation thermal transfer products are more durable. At present, the products that have been maturely developed using thermal transfer technology include: clothes, cloth bags, hats, pillows, mouse pads, coasters, pennants, mirror boxes, and hundreds of other products.

In order to increase the benefits, we analyze the reasons for the failure of sublimation thermal transfer ink, and propose methods for troubleshooting. Four main points are drawn.

Solutions:

1. The printing plate problem. When drying the printing plate using the sublimation thermal transfer ink, due to insufficient exposure or insufficient development, the photodecomposition of the blank part is not complete or the photosensitive layer of the blank part is not washed off. There are dirty spots on the thick plate, dirty spots on the glass of the plate-baking machine, before the plate is baked, the plate is thoroughly cleaned or the protective agent is applied unevenly, and the uneven rubbing of the glue will cause greasy. When it is very greasy, it can only be reprinted. If the oil is light, or there are only a few parts, you can reduce the fat on the printing plate and put some gum arabic in the fountain solution.

1. The pressure between the plate cylinder and the blanket cylinder is too large, which will also make the ink dirty during sublimation heat transfer printing. Because the pressure between the rollers is too large, the friction on the layout increases, and the layout becomes dirty. The unreasonable distribution of the lining leads to an increase in the slippage between the rollers. The lining should be arranged reasonably; if the compression amount is large and the pressure is large, the compression amount should be adjusted appropriately. The scientific processing data obtained by the housekeeper of the printing cat screen printing machine through practical experience is that the soft lining is controlled at about 0.25mm, the neutral lining is controlled at about 0.15mm, and the rigid lining is controlled at about 0.08mm.

1. The pressure between the inking roller and the printing plate is too large, and the sliding friction increases, which will affect the printing durability of the sublimation thermal transfer ink printing plate, the dots will expand, and it will also cause dirt and greasy. At the beginning of printing, only dirt is formed, and the blank foundation of the printing plate is not damaged. If it is not adjusted in time, continued friction will make the blank part lipophilic and form greasy. The pressure of the inking roller can be adjusted one by one with a plug gauge, and the pressure on both sides of the inking roller should be the same. The contact width can also be measured. The contact width of the monochromatic lithographic press from the inking roller to the inking roller and the printing plate is generally 6mm, 5mm, 4mm, 4mm; the multi-color lithographic press is generally 4mm, 4mm, 3mm, 3mm.

1. The ink roller is pressed and rolled for a long time in contact with the fountain solution and ink, which is easy to age, and the elasticity becomes smaller. The effect of the ink transferred during the sublimation thermal transfer will become worse, and the blank part of the printing plate will turn from dirty to greasy. After each color change, the residual ink skin and ink marks on the surface of the inking roller must be cleaned. The pressure of the inking roller should be appropriate, and the aging layer should be wiped off.

Conclusion

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