The new arrival of the domestic tobacco industry has introduced a laser rainbow card hard pack cigarette case, which is refreshing. This kind of laser rainbow jam is mainly BOPP laser rainbow jam, PET laser rainbow jam. Product structure is "film + plastic + paper." The production process includes four steps of film holographic imprinting, vacuum aluminum plating, compound coating, and cutting. Due to the high technological content and difficult process of the previous process, the large-width laser rainbow version is lacking. At present, the laser rainbow aluminum plating film basically comes from Taiwan Province of China and European and American countries. The latter two processes are basically the same as the ordinary gold and silver cardboard production process. Since the laser rainbow paper must be tracked, the laser version must follow the proprietary version of the sewing seam, otherwise the appearance of the paper will be destroyed. Both PET and BOPP laser rainbow paper jam both have these common features: the laser image is basically the same. Under the dark conditions, the laser rainbow cardboard is similar to the ordinary aluminized composite paper, without any obvious pattern; but under the conditions of light reflection, the paper surface appears like a rainbow after rain, so it is called a rainbow. Film, rainbow jams; good laser rainbow jam images clear and colorful, colorful, even if printed on a large area of ​​deep black, dark red and other background can not cover the rainbow effect. At present, the internationally accepted visual inspection standard is: After lighting with a lighter near the paper, observe the bright spots reflected on the paper surface, usually nine bright spots arranged in a square. The brighter the brighter the spot, the better the quality of the laser treatment.
The laser plates used to make laser rainbow jams are all large and large, and there are no seams in the range of 787mm×546mm or even larger. The product itself has the same structure and appearance. Generally, the non-aluminized surface of the laser rainbow film is composited with the paper, and the aluminum-plated surface is treated as a printing surface after printability processing. Due to the differences in the characteristics of BOPP and PET films, different characteristics were also caused, leading to the following differences in the combined rainbow jams: BOPP laser rainbow jammed papers have lower temperature resistance, stretch resistance, and paper stiffness than PET laser rainbows. Paper jam. In particular, the printing of cigarette packs is generally glazing. For heating and longer lengths, BOPP laser rainbow paperboard tends to shrink into an arc shape; PET laser rainbow paperboard generally does not appear this phenomenon. Printing plants generally choose to print on the aluminized surface. Therefore, the level of adhesion between the aluminized layer and the film directly affects the print quality. In comparison, due to the poor polarity of the BOPP film, even after corona treatment, its dyne value is lower than that of the same corona treated PET film, resulting in significantly lower adhesion of the aluminum plating layer and film of the BOPP laser aluminum film. The adhesion of the aluminum coating and film on the PET aluminum coating.
Therefore, BOPP laser rainbow card printing adaptability is not as good as PET laser rainbow jam. Mainly BOPP laser paper printing is more difficult, prone to poor adhesion of the ink, especially after the die cut is more prone to the above defects. The thickness of PET film is generally 0.12mm to ensure its stiffness. This directly leads to a larger thickness of the BOPP laser rainbow jam, and the stiffness is not as good as a thinner PET laser rainbow jam.
At present, both PET and BOPP laser rainbow paperboard have been used in cigarette packaging, and the market is gradually expanding. This has played an important role in accelerating the development of new cigarette packaging materials and improving the research and development level of tobacco paper packaging.