Control drying temperature and time during book printing
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Use rounded corners to make the bottom, because the rounded thermosetting ink is liable to flow when it is melted at high temperature, so that the ink flows into the gap of the cloth. When the ink cools, it forms a whole with the cloth, which is firmly tied to the root in the mud. The same reason can not be pulled out, but the right angle will not flow when it is exposed to high temperature, so its fastness is slightly worse, but because of the performance of the right angle, it can print out the right angle effect of the knife cut, and the rounded ink Can't do it.
We analyze according to the principle in the first article. If the ink is thinned or scraped with a thin plate, the ink will definitely enter the gap of the cloth, so it is beneficial to use the thin plate to scratch the bottom or dilute the ink to enhance the ink and The firmness between the substrates.
The drying temperature and time directly determine the success or failure of thermosetting ink printing. Thermosetting inks are thermoplastic inks. When the temperature and time required by themselves are not reached, the resin and plasticizer are difficult to be completely polymerized and plasticized. The result is ink. The system is not very tight, but it is very loose. With the finger clasp, it will be buckled like a powder, so there is no fastness. Some printing manufacturers dry the ink to the surface and have brightness. It is considered that there is fastness. This is completely wrong. It is easy to have brightness. For example, it is very bright when it is blown for a dozen seconds with a high temperature gun, but this is the result of surface plasticization. In fact, it is not plasticized internally. There is no fastness at all. Generally speaking, the high temperature thermosetting ink plasticizing temperature is 180 degrees and 3 minutes, the medium temperature is 160 degrees and 3 minutes, and the low temperature is 135 degrees and 90 seconds. However, the drying furnaces of different manufacturers may not be consistent, and the printed patterns are also The thickness of the barbecue is also different, so this data is only for reference.