The adhesive of PTP aluminum foil is coated on the inner side of the aluminum foil, and its function is to make the aluminum foil and the medicinal PVC hard sheet firmly heat-pressing together, so that the medicine inside the plastic hard sheet blister is separated from the outside world, and achieve the purpose of sealing the medicine. In the process of loading the medicine for heat sealing, the adhesive layer is activated by thermal pressure, so that it is firmly bonded to the PVC plastic hard sheet, which requires the adhesive layer and PVC resin should have good heat sensitivity and compatibility with the substrate.
When the ink with large viscosity needs to be diluted with a large amount of thinner, it should be stirred while adding the thinner, so that the thinner is evenly distributed in the whole ink. Measured by a dosimeter, it is about 20-30s. Indoor temperature and humidity have an effect on the ink concentration, it is best to use the ink concentration detector to determine the amount of solvent added, and according to the changes in temperature and humidity, every certain period of time to determine the ink concentration.
When using intaglio printing to print aluminum foil products, the ink concentration is too low, it will cause the color of the printed text pattern is not bright, and the screen pattern will produce the phenomenon of paste plate; the ink concentration is too high, it will produce the phenomenon of cracking at the coating, which is not only a waste of ink, but also prone to cause the printing surface is not flat, and it is also not beautiful. In addition, according to the speed of aluminum foil printing coating machine and printing gravure roller inking hole depth to choose the best ink.