Sublimation thermal transfer inks include sublimation offset printing inks, sublimation screen printing inks, sublimation gravure inks, sublimation inks 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 different design patterns, the thermal transfer printing is printed on the thermal transfer paper by the printing machine, and then the pattern is printed. The transfer paper of the pattern is in close contact with the fabric. Under the condition of controlling a certain temperature, pressure and time, the ink sublimates in a gas phase state from the printed paper to the fabric, and enters into the fabric through the sublimation and diffusion of the gas phase to achieve color purpose.
The pattern of thermal transfer printing is rich in layers, bright in color, small in color difference, and wear-resistant and light-fast, so sublimation thermal transfer products have more durable advantages. At present, the products that have been maturely developed using thermal transfer technology include: clothing, cloth bags, hats, pillows, mouse pads, coasters pennants, mirror boxes, and other hundreds of products.
Sublimation thermal transfer inks are widely used in the printing of high-end products because of their obvious advantages. However, sublimation thermal transfer inks often appear greasy, dirty, and floating ink. In order to troubleshoot problems and increase user benefits, Yinmao Ink Experts, based on the industry's best service platform, analyzed the causes of the above faults of sublimation thermal transfer inks and proposed methods for troubleshooting. Four points are summarized.
1. Printing plate problem. When the printing plates that used sublimation thermal transfer ink were dried, due to insufficient exposure or insufficient development, the photolysis of the blank part was not complete or the photosensitive layer of the blank part was not washed off. Dirty spots on the thick plate, dirty spots on the glass of the plate-making machine, the plate surface is thoroughly cleaned or the protective agent is unevenly coated before baking, and uneven rubbing will cause greasy. When the greasiness is serious, you can only reprint. If the greasiness is light, or there are only very few parts, you can reduce the fat of the printing plate and put some gum arabic in the fountain solution.
2. Too much pressure between the printing plate cylinder and the rubber cylinder will also make the ink dirty during sublimation thermal transfer printing, because the pressure between the cylinders is too large, the friction force on the plate surface increases, and the plate surface becomes dirty, if The unreasonable distribution of the packing lining leads to an increase in the amount of slippage between the rollers. The packing lining should be arranged reasonably; if the compression amount is large and the pressure is high, the compression amount should be adjusted appropriately. The scientific processing data obtained from the practical experience of the cat cat printing machine housekeeper is that the soft lining is controlled at about 0.25mm, the neutral lining is controlled at about 0.15mm, and the hard lining is controlled at about 0.08mm.
3. The pressure between the inking roller and the printing plate is too large, and the sliding friction increases, which will affect the durability of the sublimation thermal transfer ink printing plate, the dots will expand, and it will form 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 rubbing will make the blank part oleophilic and form greasy. The pressure of the inking roller can be adjusted one by one with a plug gauge. 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 monochrome lithographic printing machine from the inking roller to the ink receiving roller and the printing plate is generally 6mm, 5mm, 4mm, 4mm; the multicolor lithographic printing machine is generally 4mm, 4mm, 3mm, 3mm.
4. The inking roller is pressed for a long time to roll and contact with fountain solution and ink. It is easy to age and the elasticity becomes smaller. The effect of the ink transferred during sublimation thermal transfer will become worse, and the blank part of the printing plate will change from dirty to greasy. After each color change, the remaining ink skin and ink marks on the surface of the ink roller must be washed. The pressure of the inking roller should be appropriate. If the aging layer is found, it should be wiped away. In severe cases, remove the ink roller and put it on the grinder to wipe the hardened surface layer.
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