CTP plate making is a comprehensive, multidisciplinary product, it is a set of optical technology, electronic technology, color digital image technology, computer software and hardware, precision instruments and materials technology, automation technology, network technology and other new technology in the integration of high-tech technology.Which also easy to appear some problems, longyin printing group finishing the following solutions for you.
A, the dirty is refers to the plate on the graphic area and the graphic area have dirty points, lines or road, leading to print on the dirty things.Causes of plate in the dirty basically has the following several aspects.
(1) the CTP plate itself quality problems, such as production processes is not good, sand storage capacity is not enough, plate material batch fluctuations in performance, etc.
(2), the output of the CTP development links appear problem, lead to plate purpose.Therefore, at ordinary times should pay attention to check the exposure or potion aging degree;Protection of dilution ratio is appropriate, whether metamorphism;Whether retouching damage aluminum version of the base, etc.
(3) the education version printing machine use liquid and the plate does not match or the water in the tank deployment is not appropriate, acid on the high side.Ink viscosity is low, emulsified seriously;The ink roller ink loads or too much ink roller aging.
In front of the CTP version of the computer, some printing enterprise version will use clean fluid clean layout, prevent dirty on printing.But must ensure that the clean version of CTP coating no harm, otherwise it will lead to fall edition.Plate appeared on dirty, if can use the clean version of the liquid to erase show is floating dirty, is not caused by plate not rinse;If need to use pen retouching, off not rinse for specification plate.
Second, refers to the boot when the printing ink, plate picture and text area does not close the ink or ink on uneven, leading to the main factors of plate is not on the ink has the following several aspects.
(1) plate or potion itself quality problem;Overdevelopment, plate coating loss serious;Protection rubber coating too thick, need to clean it for a long time on water roll or wipe edition version of the liquid.
(2) press water;Ink viscosity is too large, causing the deinking or ink poorly;The paper off powder, galling.Education version fluid and the plate does not match or the ratio of the water in the tank is not appropriate.
(3) plate coating has wear or corrosion, not a good example, need to replace the new.
Three version, mainly appeared on the rotary press, because rotary press production speed, require plate in the direction of the cylinder size is very precise, plate grain (Graining direction) to work with version of roller axis vertical.And because sheet-fed printing machine production speed is slow, no request for plate grain direction.Other possible causes of plate broken version: version has a problem, bending version not founder, plate size is wrong, ladle lining is too short, etc.
Fourth, leave a version of the decline in the quality
Some printing is not high but need only printing work, in the pursuit of consistent color and cost savings, is often used to plate need to be preserved.Leave edition quality in addition to the related to plate itself performance, also had a lot to do with leave version methods and storage conditions.Experienced operator keep plate can be repeated use 2 ~ 3 times.Here provide general version of the process, printing enterprises can do some adjustment according to actual condition, suggested that it is best to use the machine operation.
(1) clean plate.After the plate to be removed from the printer should wash ink as soon as possible.Clean plate used in chemicals, must to plate coating damage is not big, otherwise the coating damage is serious, use again will soon fall edition.
(2) clean plate.After the ink on the plate clean water will be the columns of the chemical thoroughly clean, prevent the residual material damage plate coating.
(3) storage.After the completion of the first two steps, the layout of evenly coated with protective glue, after protecting glue dry, covered with paper backing, in a dry and ventilated environment.Note should choose to use a long-term protection capacity to protect glue, ordinary glue can only protect plate about 7 days.
No comments:
Post a Comment