Nowadays, the competition in the daily cosmetics market is very fierce. Manufacturers do their best to find new and attractive packaging to highlight the inherent quality of the products and the attractiveness on the shelves. There are so many products on the shelves of retailers, forcing manufacturers to make every effort to make their products look different on the packaging. At present, the use of crystal-clear packaging materials has become a popular trend. Transparent packaging is commonly used in daily cosmetics markets in Europe, America, Japan, etc. The clear and transparent packaging is more fashionable.
With the improvement and development of UV printing technology, transparent folding plastic boxes have gradually become popular in the market due to their obvious advantages in product performance, resistance, and anti-counterfeiting, and are increasingly used in daily cosmetics. package. At present, the production of transparent folding plastic boxes mainly uses PVC (polyvinyl chloride), PET (polyester) and PP (polypropylene). Because the price of PVC is relatively low, and the surface printing performance is better than PET and PP materials, transparent folding plastic boxes made of PVC are more common. However, due to the poor environmental performance of PVC, industry insiders predict that as people's environmental awareness increases, the amount of PVC will gradually decrease and may be replaced by PP and PET. The advantage of UV printing is that the plastic sheet is easy to soften and deform when heated. Therefore, the transparent folding plastic box cannot be dried by hot air after printing, but should be UV cured. Correspondingly, the printing ink must be offset UV ink or screen UV ink. In order to ensure the smooth progress of printing.
UV printing has the advantages of increased production speed, improved product performance, quality optimization, environmental protection standards, cost reduction, cold curing on heat-sensitive substrates, reduced energy consumption, reduced loss, less space occupation, and product chemical resistance such as solvents or cleaning agents Enhance and many other advantages. UV curing does not require a heat source, does not contain solvents, and can be cured quickly (cure time can be less than one second), especially suitable for printing non-absorbent printing materials, but also particularly suitable for multi-color high-speed printing. UV curing The entire curing system is a solvent-free system, that is, 100% solvent-free formula and no VOC (Volatile Organic Compound). This aspect adapts to the requirements of environmental pollution regulations. At the same time, due to the elimination of dusting, the work has been greatly improved surroundings. And reduce the machine wear caused by powder spraying. On the other hand, UV curing can bring economic benefits to investors, such as high productivity and high process output, and can reduce the storage of raw materials and finished products. The use of screen printing UV inks to print plastic sheets can produce special effects such as wrinkles and frosting, and the field printing effect is very good, but the reproduction effect of the mesh tone image is poor, because screen printing is not suitable for printing fine patterns, resolution Achieving 80 lines / inch is good. The UV offset printing method is very beneficial for the reproduction of mesh-tone images, and its resolution can reach more than 200 lines / inch, which is almost the same as the quality of paper printing. If you are printing cosmetic packaging with many images of people, it is best to use UV offset printing.
Common problems of plastic box UV printing
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.
With the expansion of the transparent folding plastic box packaging market, in order to increase communication between upstream and downstream enterprises in the field of plastic box processing, the printing and molding technology of transparent folding plastic boxes has been improved to a new level, May 16, 2006 , The magazine held the first South China transparent folding plastic box processing technology seminar. The conference had a heated discussion on the topics of plastic box design, plastic box post-press molding technology, plastic box materials and glue selection, plastic box spraying system, etc. End users of well-known daily chemical industry also gave a speech on the spot. The development of transparent folding plastic boxes is still in its infancy, and its processing technology still needs to be continuously improved and improved, in which the development and exploration of enterprises themselves are particularly important. From the meeting, in addition to the application of UV technology to print plastic boxes, some companies also used ordinary offset presses + quick-drying ink to print plastic boxes, and the quality is not bad.
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