In short, the past few years, a large number of labels a large soft roll, Offset Printing convex plastic trend, especially in recent years, popular in the label industry intermittent web label offset press, due to the printing effect, , The cost of printing plate low, short paper machine transfer loss is low, you can also online screen printing, cold, polishing, die cutting and a series of advantages, Offset Printing has squeezed the label industry a lot of share. But because of its low production capacity, high technical requirements of the staff, printing quality is not flexo stability, Offset Printing or let more than 3,000 meters of large orders tend to flexo process.
1. Offset printing industry in China has occupied most of the country, Offset Printing many companies do stickers before the label business, Offset Printing it has been useful to print the experience of offset packaging. Therefore, there are still customers to take the box on the trademark effect to require the label printing business printing the same effect of the label, which is one of the typical situation of offset printing flexo.
2. The sample provided by the customer is printed with a flexo printing machine with an offset printing machine, and there is no similar printing machine, and the offset part must be changed to flexo.
3. Order hours, with offset printing proofing, but when the order quantity increases, Offset Printing beyond the expected, had to offset printing flexo.
4. Control of offset printing ink balance of the technical difficulty is high, Offset Printing the color stability is far less than flexo, customers often complain about the color error range exceeded, so to flexo to flexo.
Offset to flexo must be offset and flexo must have a full understanding, so that the heart of the end, in order to convert success. I follow the experience, sort out the following offset to flexo printing method.
Offset is the only one of the four printing methods indirect printing, no printing indentation. Flexo is a light kiss printing, the pressure is light, so it seems that offset printing flexo seems to be no problem. But some offset press long open flexo opportunities to habitually set the pressure is great, Offset Printing need to be prevented.
Offset due to the existence of ink balance, water and ink blend, Offset Printing edge emulsification, so the printed out of the network is not complete, the edge of the virtual. Coupled with the indirect printing, which brought low ink transfer rate, ink color unsaturation and other defects, Offset Printing resulting in the label industry, most of the offset label products shelf effect is not strong. Flexo is a kind of letterpress printing, ink layer thick. From this point of view, offset printing flexo should be no problem. But the flexo ink layer is too thick to cause blockage, the need for printing or printing twice.
Offset version of the line can easily reach 200lpi, Offset Printing the plate on the gradient to the zero point of the network can also be washed out, Offset Printing so the gradient to the net is extremely soft. Flexo printing lines are generally 175lpi, Offset Printing rarely done 200lpi. Flexo version of the network is too small, easy to invade the anilox roller network points, causing blocking version; network is too big network and too obvious, the gradient is not soft. Therefore, at this stage flexo to use high-definition network technology can be comparable to the offset gradient effect.