Does the CTP plate need to be glued during the printing process? How to apply glue? Will the quality of the printed matter be affected after brushing? These manuscripts have been discussed in the printing industry. Next, the author will combine the practical operation experience in pre-press work to talk about the understanding of CTP plate glue.
Benefits of plate glue
In the printing process, the good printing plate will be printed on the machine immediately, whether it needs to be glued. I believe this is not very clear to the operators of many printing plants. Strictly speaking, the printing plate should be glued before it is printed on the machine. Here I will first introduce the benefits of plate glue.
(1) It can protect the fine sand on the surface of the base, enhance the abrasion resistance of the sand version, and improve the printing resistance.
(2) It can protect the hydrophilic layer of the plate base, improve the inking of the graphic parts, and help to quickly achieve the balance of water and ink during printing.
(3) It can protect the printing plate, avoid slight scratches or scratches, reduce waste of digital printing, and increase printing speed.
(4) It can effectively seal the sand and prevent dust from entering, and prevent the printing plate from being directly exposed to the air and causing the printing plate to oxidize too quickly.
It can be seen how important it is for the printing plate to be glued before printing. Everyone should have a clear understanding of this, and use the benefits of the printing plate glue as much as possible to quality control and improve the printing plate printing and printing quality.
How to apply glue to the printing plate
The printing plate glue is actually very simple, that is, after mixing the protective glue and water in a certain proportion and stirring evenly, the glue is formed on the printing plate to protect the printing plate.
It should be noted that when you use a manufacturer's printing plate, you can ask the manufacturer's technical staff to give instructions on the use of protective glue. Under normal circumstances, manufacturers will provide the appropriate glue for the printing plate to protect the printing plate. If the printing plate manufacturer really cannot provide the corresponding glue, or the printing enterprise wants to use better glue, the operator should first ask the printing plate manufacturer's technical staff: what brand of glue can be used when printing plate is glued, and in what proportion Wait. At present, the commonly used brands of plate printing glue are acquired by Nikken, Kodak, Fujifilm, etc. These brand glues can be applied to most printing plates on the market.
The methods of printing glue are generally divided into manual glue and machine glue. Hand glue is to use a brush and other tools to brush the matching glue on the printing plate used. Because it is a manual operation, it is necessary to brush the surface of the printing plate multiple times with a brush, and the effect is not uniform. Machine glue application is done with a machine. The glue application roller is smooth and elastic. The application time is faster and the thickness of the applied glue layer is relatively uniform. Most printing plants now use machine brushing. Next, the author will mainly talk about the problems that the machine needs to pay attention to when applying glue.
Matters needing attention in printing plate
There are a lot of things to pay attention to when you apply glue to the machine. First, you need to ask the following questions.
(1) When applying glue to the printing plate, is the glue ratio normal?
Under normal circumstances, the protective glue and water are proportioned according to a certain proportion. According to the choice of the protective glue brand, the amount of water required for the proportioning with water is also different. For example, when glue is selected, Fuji glue is selected, and the ratio of protective glue to water is 1: 3 to achieve the best state of the glue ratio. At this time, the glue protects other packaging of the printing plate and is easy to print. The water-ink balance is completed when the plate is printed.
(2) Is the top roller clean when printing?
If the glue roller is not clean when processing the plate, the operator needs to use a damp cloth to clean the glue roller. If there is glue accumulation and solidification on the glue roller, the glue on the printing plate and text passing here will be too thick. During machine printing, there will be a phenomenon of partial non-inking. If it is because the protective glue is not clean, you need to replace the dirty protective glue and use new protective glue.
(3) Is the pressure of the rubber roller normal when brushing?
Unfavorable, the operator must ensure that the glue layer on the surface of the printing plate is moderate and the glue is uniform. It is also important to apply thick, thin and even glue. If the glue layer is too thick, you need to use plate-cleaning liquid to wipe the printing education when printing on the machine.
(4) Is the drying temperature normal after brushing?
The temperature after glue application should not be too high or too low. The drying temperature is generally between 40 ℃ ～ 50 ℃. Too high may cause the chemical reaction of the photosensitive layer on the surface of the printing plate. If it is too low, the glue on the surface of the printing plate may not dry. .
(5) Is the operation correct when applying glue?
The author makes a small suggestion here, I hope to help everyone. Epson, when the operator is off work early in the evening, please clean the rubber roller with cloth first, and then pass 4 to 5 scrapped plates, and perform 1 cycle of cleaning; if you stop for more than 2 hours during work, you need to pass 2 to 3 Sheet scrap, check whether the layout is clean and cut after printing, to ensure that all the printing plates on the machine are clean and perfect.
(6) Do you usually maintain the glue circulation system?
Depending on the amount of publication, the glue circulation cycle, including glue rollers, transmission glue pipes, glue pumps, and glue storage barrels, should be thoroughly cleaned, usually once a week.
The above-mentioned experience hopes to remind the CTP system operators to have some knowledge of CTP plate gumming, and hope to help various printing companies. The printing enterprise can supply water / moisten the plate according to its actual situation, and process the printing plate reasonably after processing to improve printing efficiency and product quality.
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