Compared with traditional ink printing, UV printing does have great advantages, but UV ink printing on the surface of plastic substrates is still a challenging task. The biggest problem of UV ink printing on plastic substrates is how to make UV ink adhere firmly to the surface of plastic substrates, that is, the problem of adhesion. During the curing of UV ink, the internal components undergo cross-linking polymerization, and the instantaneous volume change produces a large internal stress, which affects the adhesion of the ink to the printing material. Therefore, it is generally necessary to perform surface treatment on the plastic sheet before printing to increase the surface tension of the plastic sheet and increase the adhesion of the ink. Currently, corona treatment is used more often.
Although this problem can be improved by surface treatment or modification of the substrate, the fundamental solution is to seek and develop UV inks with good absorption, low shrinkage stress and low price. Registration is also one of the common problems in UV plastic printing. The plastic sheet is harder and less flexible than paper. It is easy to cause the problem of inaccurate registration during the printing process. In this regard, when positioning the plastic sheet, only the side push gauge can be used, and the side pull gauge can not be used to avoid the inaccurate overprint caused by insufficient pull gauge strength. In addition, the heat generated by the infrared ray during the startup of the UV lamp is also sufficient to deform the plastic sheet, resulting in inaccurate overprinting and unstable print size.
For this problem, Manroland uses eltosch's cold UV technology in its offset printing equipment. This technology uses a replaceable reflector to reflect the infrared rays generated when the UV lamp is started, and uses a cooling source to cool down during operation. The UV light emitted is then used to cure the UV ink. New progress in UV printing technology The latest domestic launch of UV stereo grating ink UV-1278N, mainly used for printing stereo grating diaphragm. Different from the traditional hot press molding process, the new process uses screen printing to print ink on a transparent diaphragm to form a columnar grating pattern directly; it can also print stereoscopic grating ink directly on the printed matter to form a three-dimensional pattern. Selective printing of patterns can make the parts three-dimensional, and the printed patterns have obvious three-dimensional effects, which are comparable to the hot-pressed grating plate, which opens up a new method for three-dimensional printing. Using this ink to print grating diaphragms can greatly reduce production costs and improve production efficiency. The printing substrate can be a transparent plastic film, such as PVC, PC, PET, or paper, metal, glass, ceramics, etc. The screen mesh is preferably 200-350 mesh. The ink is colorless and transparent, fast curing by ultraviolet light, the cured film does not yellow, good adhesion fastness and toughness.
Speedmaster CD74 offset printing machine for UV printing For speedy commercial printing companies, packaging and label printing companies that use a variety of substrates, and printing companies that use double-sided printing to produce greeting cards or book covers and other products, Speedmaster CD74 Double-sided printing machines are an ideal model. In addition to the standard models for single-sided printing and double-sided printing, the Speedmaster CD74 also has various specifications of printing unit and glazing unit configuration. It can be a model with dual glazing units, or integrate functions such as UV glazing. The models that come together can also be a model that finishes glazing before printing or glazing after printing in a single pass, which is completely configured on demand.
UV inks and varnishes have gained rapid popularity in the printing industry. They can better adhere to non-absorbent materials, not only are they not easy to fall off, but they also have a high gloss. Speedmaster CD74UV offset printing machine follows this development trend. At the same time, it is also the world's first offset printing machine awarded the title of "Best UV Printing" by the German printing and paper insurance and protection agency. All the elements related to UV printing are integrated by CD74. It can be said that CD74 opens up a precedent for production process, equipment operation and investment protection.
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