When a four-color offset printing machine prints a large-area field version of a product, the printed matter is often scratched and given dirt by the delivery roller. Since most of the used printing presses (such as manroland, Heidelberg, Komori, etc.) have their anti-adhesive papers (or anti-sticking nets) damaged, and the corresponding equipments are not complete, handling the sticky papers is a frustrating one. Let's talk about our experience in using imported four-color offset printing machines to print large-area field prints for reference.
1. In the printing sequence, try to arrange the full version on the ground in the fourth group to reduce the impact of the printed product.
2. The fluidity of the ink in the field version should be greater than normal. In winter, the combination of red dry oil and varnish is suitable, and the proportion is about 8%. This kind of ink is used for printing copper plate paper and white cardboard. Ordinary paper printing inks can be blended in normal proportions.
3. When replacing the new release paper still does not solve the problem, it is recommended to install 3 to 5 springs (circumferential direction) with a diameter of about 6 mm on the delivery roller. Without a suitable spring, find a few diameters with a plastic sheath. It is also possible to replace the wire with 2mm or so, but the effect is slightly worse.
4. The non-solid part of the printed product is attached to the corresponding part of the take-up roller by a small piece of 5mm thick foam, which raises the distance between the delivery roller and the printed product. If the field version is arranged in the first few groups, the thickness of the foam must be controlled within the range that does not affect overprinting.
5. When printing with manroland four-color machine, the ground plate is arranged in one or two groups, and the middle transfer tooth row will also touch the dirty printing product due to ink deposit. So long as it is cleaned frequently, it can solve the problem.
6. Some manroland machines have only a few take-up wheels on the delivery roller. If you often print copperplate paper, it is best to refer to the domestic 08 machine's take-up roller to modify it, and it is easier to do it.
During the printing process, pay attention to the above points and basically solve the problem of bumps when printing large-area solid prints.
1. In the printing sequence, try to arrange the full version on the ground in the fourth group to reduce the impact of the printed product.
2. The fluidity of the ink in the field version should be greater than normal. In winter, the combination of red dry oil and varnish is suitable, and the proportion is about 8%. This kind of ink is used for printing copper plate paper and white cardboard. Ordinary paper printing inks can be blended in normal proportions.
3. When replacing the new release paper still does not solve the problem, it is recommended to install 3 to 5 springs (circumferential direction) with a diameter of about 6 mm on the delivery roller. Without a suitable spring, find a few diameters with a plastic sheath. It is also possible to replace the wire with 2mm or so, but the effect is slightly worse.
4. The non-solid part of the printed product is attached to the corresponding part of the take-up roller by a small piece of 5mm thick foam, which raises the distance between the delivery roller and the printed product. If the field version is arranged in the first few groups, the thickness of the foam must be controlled within the range that does not affect overprinting.
5. When printing with manroland four-color machine, the ground plate is arranged in one or two groups, and the middle transfer tooth row will also touch the dirty printing product due to ink deposit. So long as it is cleaned frequently, it can solve the problem.
6. Some manroland machines have only a few take-up wheels on the delivery roller. If you often print copperplate paper, it is best to refer to the domestic 08 machine's take-up roller to modify it, and it is easier to do it.
During the printing process, pay attention to the above points and basically solve the problem of bumps when printing large-area solid prints.
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