Key analysis of the application of the hottest wat

Key analysis of the application of water-based plastic ink

Sun Yat sen University is one of the first universities in China to set foot in the research and development field of Gravure plastic ink. As early as 2000, the "Water-based Gravure plastic ink for food packaging and printing", a hundred projects of scientific and technological innovation in Guangdong Province presided over by the Polymer Research Institute of the school of chemistry, passed the provincial appraisal, and was jointly awarded the third prize for scientific and technological progress of Guangdong Province in 2001 by Sun Yat sen University (the first person) and Zhuhai Ruilong ink company (the second person); The "clean production technology of water-based plastic composite ink" in cooperation with Guangzhou Zhujiang Chemical Group has passed the provincial scientific and technological achievement appraisal, and has obtained an invention patent with the authorized announcement number of CNC. In mid August this year, this journal went to the ink/coating research center of the polymer Institute of the school of chemistry of Sun Yat sen University to interview Wang Xiaomei, an associate professor who has been engaged in the research and development of Gravure plastic water-based inks, hoping to get some latest information enlightening enterprises from the academic community

nowadays, the packaging and printing industry is not widely used, and it is useful in Qingdao, Tianjin, Xinhui, Guangdong, Foshan and other places. Now many printing enterprises are paying attention to this product. Only a few ink factories are producing water-based plastic inks. I have seen relevant products abroad

the adhesion of water and ink has met the printing requirements, but now it is only a problem of slow printing drying speed and printing adaptability. The drying channel of foreign printing machines is relatively long, while the drying channel of domestic printing machines is generally only about 2m, which is not very dry

one of the biggest obstacles in the application of Gravure plastic ink is the quality of products, and the other is the problem of equipment. Compared with solvent based ink, Gravure plastic ink still has a gap, but now the gap is getting smaller and smaller. There is also a more important consumption concept issue of health, environmental protection and gorgeous prints. Maybe the printing effect of ink is acceptable abroad because of environmental protection and non-toxic, but it is difficult to accept in domestic jc/t992 ⑵ 006 "expanded polyethylene board adhesive for wall insulation", and customers will not be satisfied

for the specific application of ink in printing enterprises, I think it is still the problem of printing drying speed. For printing enterprises, it is mainly the low efficiency of printing, which is related to printing equipment. Our test results: under the drying condition of 60 ℃, the BOPP film is printed on the machine with a 2m long drying channel, and the printing speed is about more than 30 m/min; The printing speed of BOPP film can reach more than 80 m/min when it is printed on the machine with 8M long drying path. If the temperature of the drying channel is increased, it is conducive to improve the printing speed, but above 80 ℃, the PE film is easy to deform

another problem is the cost. The price of water-based plastic ink is more than 10% higher than that of intaglio ink containing toluene at present, but the price is the same as that of alcohol ester polyurethane ink. Due to the high solid content of ink, the amount of ink used for printing the same area is about 10% less

in plate making, the engraving angle should be properly improved

in terms of drying, it is mainly to change the drying method. At present, infrared drying and electric heating drying are mainly used. I think it may be better to press the ready to start button by microwave, which not only dries quickly, but also does not damage the printing substrate

Gravure plastic ink can be applied to all plastic substrates. In principle, Gravure plastic ink can also be applied to the printing and packaging of high-temperature cooking bags. The main reason is that the surface tension of the ink should match the surface of the substrate. Resin is the heart of the ink, which determines the adhesion of the substrate that has passed the environmental impact assessment. It is ideal that the substrate surface can reach 44 dyne. According to our test, it has good adhesion on pet, PVC, BOPP and PE

the quality of products during printing is directly related to the performance of ink. At present, the gloss of domestic plastic ink is better than that of solvent ink, and the brightness is slightly worse; In terms of adhesion, the adhesion on PVC, pet, pure aluminum foil and other substrates is good, but the adhesion on nylon substrate will be lower

Gravure plastic ink is more complex in the application process, because using water as diluent, the surface tension of water is relatively large, and some surfactants are needed to adjust the tension, which involves the balance between additives and ink performance, and the technical difficulty is higher. For example, to adjust the pH value, the pH value can not be seen with eyes, but measured with instruments, which puts forward relatively high technical requirements for front-line operators and many customers have inquired about the new mechanism of Shan Bochuang bu6800

water based ink is the only ink approved by FDA, which should be the trend of market development. I think alcohol soluble ink is a transitional ink, which should gradually move towards water-based ink. Of course, this requires the joint efforts of printing equipment, packaging and printing, plate making and ink enterprises. At present, some domestic film manufacturers produce olefin films with polarity, which have relatively high surface energy and do not need corona treatment, so they are more suitable for water-based ink printing. I think the Gravure plastic ink market has a good prospect

information source: ink information