Causes of ink delamination or ink "dissolution"

After the compounded flexible packaging material matures, most of the ink layer is transferred to the aluminized surface. Most of this phenomenon occurs on PET printed films, and the probability of occurrence on OPP printed films is relatively small. The possible causes are as follows.
(1) The occurrence of OPP printing films is mostly related to the polyamide type inks used. This phenomenon will disappear when the chlorinated polypropylene type ink is used. In addition, the phenomenon that OPP surface tension cannot meet the use requirements will also cause this phenomenon. .
(2) There are three factors affecting the delamination of PET printing film.
â‘ There is a certain relationship with the chlorinated polypropylene ink used, and it can be solved by changing to the special ink for polyester and nylon.
â‘¡Related to the influence of residual solvent, as long as the residual solvent amount in the printing process is reduced, the transfer phenomenon will be reduced.
â‘¢It is related to the quality of PET film products. If the corona treatment of the PET film is excessive, it will damage the surface of the film, and ink transfer will occur.
(3) In the solvent-free compounding process, the ink edge may become flowered or the ink "dissolve" occasionally. This is mainly because the solvent-free adhesive itself has the lowest molecule, which is relatively close to the ink molecule, resulting in mutual solubility. In general, this phenomenon uses ink produced by a smaller ink manufacturer or is adjusted by the flexible packaging manufacturer. The ink used will remain stratified for a period of time; if this phenomenon is encountered, it is recommended to replace a certain production scale. Ink production Ink produced by the old manufacturer or printed by the ink manufacturer to adjust the spot color.
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