Development and Application of Lithographic Offset UV Fold Resistant Ink

In China's cigarette packaging, a large number of coated gold and silver coated cardboard and coated laser gold and silver cardboard are applied. The plastic film materials covered are: BOPP, PET, PVC. Backing paper, adhesive and film surface protection varnish It can be rapidly degraded in the natural environment, but these plastic films are difficult to degrade or naturally degrade in the natural environment for a long time, causing great pollution and destruction to the natural environment.

Now the State Tobacco Monopoly Administration and China Tobacco Company have realized this problem and have forced the use of green environmental protection packaging materials for cigarette factories in all provinces and cities—without the use of vacuum-coated aluminum-plated transfer paper, as the main packaging material for cigarette packs. To solve the problem of environmental pollution caused by the hard-to-degrade plastic film in coated gold and silver coated paper and coated laser gold and silver paperboard.

Foreign countries in Europe and the United States have already used green packaging materials such as white cardboard and vacuum aluminum-plated transfer paper to print cigarette packs. Since the cigarette pack printing in Europe and the United States is different from China, the printing patterns are simple and clear, most of them are local printing, and the folding of cigarette packs. The basic part is not printed, so do not have to consider offset printing ink folding problem, the general non-folding offset UV ink can be used. And China printing cigarette packs and foreign countries is different, is a full version of the large field printing, pay attention to magnificent, the entire smoke Box full version is printed with ink, if the vacuum aluminum plating transfer paper poor flexibility or poor offset printing UV ink resistance, then the cigarette folding parts of the ink is easy to burst dew white.

Therefore, a cigarette pack made of vacuum aluminum-plated transfer paper is required to start from two aspects if it is required to have good folding resistance. On the one hand, it is required that the flexibility and folding resistance of the paper be better, which involves four levels of problems. The first problem It is the flexibility of the backing paper that is better, that is, the flexibility of the paper fiber is better, the surface coating chemicals used in the bottom paper can not have a great odor, otherwise it will affect the smell of the whole cigarette pack. The second problem is the vacuum aluminum plating aluminum layer. The thickness should be appropriate, flexibility ductility is better. The third problem is that the adhesive between the backing paper and the aluminized layer is better, the glass transition temperature Tg of the binder resin used is lower, otherwise it is easy to brittle, resulting in Good flexibility in summer, poor flexibility in winter, adhesives can not have a great odor, otherwise it will affect the smell of the whole cigarette pack. The fourth problem is better flexibility of the protective layer of varnish on the surface of the aluminized layer, the use of binder resin The glass transition temperature Tg should be low, otherwise it will be brittle, resulting in good flexibility in the summer, poor flexibility in the winter, the surface protection varnish can not have a great odor, otherwise it will affect the smell of the whole cigarette pack.

On the other hand, it is required that the ink's flexibility and folding resistance must be good. There is no international standard and no national standard regarding the ink's resistance to philosophies. At present, there is only one universally established industry established and implemented by Yuxi Hongta Group. Internal standards, that is, 360 degrees folded three or more times, the ink does not burst dew, can be considered qualified. At the same time offset UV curing ink after the curing of the odor can not have a lot of residue, so as not to affect the smell of the entire cigarette pack.

After six years of research and development, the author has developed a large-volume safe use of offset UV folding ink, filling the domestic gap. The folding ink can be in Germany Heidelberg or manroland company 4+1,5+1,6+ 1 used on offset press, folding resistance: 360 degree folding, folding times> 5 times, ink does not burst, not white; printing speed: 8000----10000 sheets/hour; total curing power: 64KW; vacuum aluminum plating Adhesion on the transfer paper is very good, and it is basically odorless after curing; this folding ink can be safely used not only on the offset press, but also can be safely used after die-cutting, tobacco processing, pasting, etc. Crease-resistant ink burst white phenomenon; fold-resistant ink color: four-color red, gold red, red, four-color yellow, four-color blue, four-color black, special white; printing auxiliary materials: anti-folding agent (fill domestic blank) , Fold-resistant ink, folding and debonding agent, folding-resistant dumb oil, folding-resistant vertical water that is folding oil, folding silver oil.

I also developed another type of offset-resistant offset UV ink that has been mass-produced. The ink can be used on a 4+1, 5+1, 6+1 offset press in Heidelberg or Manroland, Germany. The printing speed is 8000- ---12000 sheets/hour; total curing power: >28KW; the ink has excellent adhesion on the coated gold and silver cardboard and coated laser gold and silver card paper, and the adhesion on the PVC plastic sheet and the plating PVC is also very good. Excellent, basically odorless after curing; Compared with other similar products at home and abroad, this ink is very outstanding in terms of flexibility, not only can be safely used on the offset printing machine, but also can be used in die-cutting, tobacco factory paste box packaging After the process is processed safely, there has never been a phenomenon of ink burst; the color of the ink: four-color red, gold-red, red-red, four-color yellow, four-color blue, four-color black, special white; printing auxiliary materials: Diversion agent, transfer ink, de-adhesive (filling domestic blank), ink fountain light oil, matte oil, where the vertical water (that is, transferred oil, transferred silver oil).

In summary, with the development of the cigarette pack industry, higher requirements have been put forward for offset printing UV inks and offset printing UV folding-resistant inks. No matter how it changes, green, low odor, and folding-resistant, it can be safely used. Paper and ink development and application principles.

Source: 21st Century Fine Chemicals Network