In addition, printing also varies from simple single-color printing to At present, demonstra-tion is proceeding, and the first target is gravure-print-ed film. Solvent ink and water-based ink are used in gravure printing, but the former ink seems to be more difficult to remove. However, as a countermeasure, the problem is solved by adjusting the cleaning speed.multi-color printing with 10 colors. but it is particularly difficult to remove mul-tiple layers of ink, and single-color ink is easier to remove even if the ink sur-face is large. In addition, there seems to be a slight difference in ink proper-ties removal due to the different physi-cal properties of the ink depending on the ink manufacturers. Anyway, they have accumulated test data to accom-modate a wide variety of printing films.In Orient Sogyo, the deinking in 600mm cleaning width was verified by the testing equipment in various cases, and the plan of the equipment which doubled the cleaning width to be 1240mm for the sales has already been prepared. The cleaning check is currently being visually judged. How-ever, it is said that appropriate number of cycles of reuse as lead film will be verified. Is it ideal if it can be used ap-proximately 5 to 6 times? In terms of printability, wettability may be one in-dicator.The targets for the sales of cleaning equipment are those who print in large quantities, those who handle industrial waste, and those who have incinerated waste, and it is hoped that a recycling scheme will be created.And, there is not only printing but also coating which adds value to the film surface. The hurdle from ink clean-ing to coating film cleaning is likely to be infinite, but there are many inquiries about it.Photo 6 Film after passing through a dryer. When viewed from the side of the equipment, the film was removed cleanly (photo 4-6).Photo 5 View of the film after ink was removed in the cleaning unit and rinse unit. The surface is wet before drying.has gloss without color (ink) remaining.Photo 7 Ink residueThe cleaning liquid regeneration device filters and removes ink compo-nents from the washed liquid pumped from the cleaning unit, and the re-moved ink residue (photo 7) is recov-ered, and the filtered cleaning liquid is repeatedly used.14Difficulty of cleaning inkThe cleaning solution pro-vided by JPMA was dripped onto the printed film and verified whether the ink is re-moved by rubbing. Whether it could be removed on-line was left to the verification of the machine manufacturer.It is possible to dissolve a certain amount of ink with only the cleaning solution, but if it is dissolved at a line-speed such as 50m/min, it is not possible to simply apply the cleaning solution, and it is difficult to respond to the required speed even if it is exposed to ultrason-ic waves. Therefore, SAWA prepared many types of brushes that differ in hard-ness, diameter, and thick-ness, and chose the ap-propriate one among them. However, as long as the ink can be removed, it does not mean that any brush is good. Because of contact with the film, consideration must be given to minimizing scratches, even if the appli-cation after ink removal is to be used as a lead film.About the futureOn May 31, 2019, the Plastic Resource Recycling Strategy was formulated, and Japan, a major consumer of plas-tics, has entered an era where the issue of waste plastics cannot be ignored.
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