CTP printing plate in the printing process need to brush glue? How to apply glue? Does brushing affect the quality of prints? The manuscripts of these problems have been discussed in the printing industry. Below, the author will combine the practical experience in the prepress work to talk about the CTP plate gluing awareness.
The benefits of printing plate gluing
In the printing process, a good printing plate will immediately be printed on the machine. Whether it needs to be glued or not, I believe that for many printing plant operators, the answer is not very clear. Strictly speaking, glue should be applied before the plate is printed on the machine. Here I first introduce the benefits of printing plate gluing.
(1) It is possible to protect the fine sand on the surface of the substrate, and to enhance the abrasion resistance of the PS plate to improve the resistance to printing.
(2) It can protect the hydrophilic layer of the plate base, improve the ink receptivity of the graphic part, and help to quickly reach the ink-water balance during printing.
(3) The printing plate can be protected from minor scratches or scratches, wasteful digital printing can be reduced, and printing speed can be increased.
(4) It can effectively seal the sand and prevent dust from entering, preventing the plate from being directly exposed to the air and causing the plate to oxidize too quickly.
It can be seen how important it is for the printing plate to be pre-printed before printing. We must have a clear understanding of this, and use as much as possible the quality control of printing plate gluing to improve the quality of plate printing and printing.
How to brush the plate
In fact, the printing plate brushing glue is very simple, that is, the protective glue and the water are mixed according to a certain proportion, and after stirring, the glue brush is formed on the printing plate to protect the printing plate.
It should be noted that when you use a manufacturer's plate, you can ask the manufacturer's technical staff to give instructions on the use of protective glue. In general, manufacturers will provide the appropriate glue for the printing plate to protect the printing plate. If the plate manufacturers cannot provide the corresponding glue, or if the printing company wants to use better glue, the operator should first ask the technicians of the plate manufacturers: what brand of glue can be used when the plate is glued, and what proportion should be used Than other. At present, the commonly used plate glue adhesive glue brand has Japanese research, Kodak, Fujifilm and other acquisitions, these brands of glue can be applied to most of the printing plate on the market.
Printing brushing methods are generally divided into manual brushing and machine brushing. Manual brushing uses brushes and other tools to brush the matching glue on the used printing plate. Because it is a manual operation, it needs to brush the surface of the printing plate several times, and the brushing effect is not even. The machine's brushing is done by the machine, the brush roller is smooth and elastic, the brushing time is faster, and the thickness of the brushing layer is relatively uniform. Most printers now use machine gluing. Below, the author will mainly talk about the problem of machine brushing.
Plate Glue Precautions
There are many issues to be noted in the machine's brushing. First of all, it is necessary to ask the following questions.
(1) When the printing plate is glued, the plate material and the glue ratio are normal?
Under normal circumstances, the protective glue and water are proportioned according to a certain proportion. According to the selected protective glue brand, the amount of water required when matching with water is also different. For example, if the glue selected is Fuji glue, the ratio of the protective glue to water is 1:3 to reach the best state of the glue ratio. At this time, the glue not only protects the printing plate from other packaging, but also easily prints. The printing ink balance is completed during printing.
(2) Are the rollers on the plate clean?
If the gluing roller is not clean during stencil printing, the operator needs to use a damp cloth to wipe the squeegee clean. If the gluing roller is glued and solidified together, the glue on the printing plate graphic part passing there will become too thick. When the machine prints, it will appear that it is not inked. If it is because the protective adhesive is not clean, you need to replace the unclean protective adhesive with a new one.
(3) Is the pressure of the rubber roller normal when brushing?
Unfavorable, the operator must ensure that the surface of the printing plate is moderately adhesive and the glue is uniform. It is also important that the glue be thick and thin and even and moderately moderate. When the glue layer is too thick to print on the machine, it is necessary to use a cleaning solution for printing and printing. If it is too thin, it will not reach the effect of the printing plate.
(4) Is the drying temperature normal after brushing?
The temperature after brushing should not be too high or too low. The drying temperature is generally between 40 and 50°C. Too high may cause a chemical reaction on the photosensitive layer on the surface of the printing plate. If the temperature is too low, the surface of the printing plate may not be glued.
(5) Is the operation correct when brushing?
I hereby make a small suggestion and hope to help everyone. When the operator gets off work early in the evening, Epson, please use a cloth to clean the rubber roller first, and then use 4 to 5 scraps to recycle and clean it once. If you stop at work for more than 2 hours, you need to use 2 to 3 scraps. Edition, check whether the layout is clean after stencil printing to ensure that all printing plates are clean and perfect.
(6) Do you usually maintain the gluing cycle system?
According to the amount of publication, the gluing cycle should be regularly cleaned, including the rubber roller, the transmission of plastic pipes, the transmission of plastic pumps, storage barrels and other thorough cleaning, usually 1 week for the benefits.
The above-mentioned experience hopes to remind the CTP system operators to have some knowledge of CTP printing plates and also hopes to help various printing companies. Printing companies can supply water according to their actual conditions, and rationally deal with printing plates after printing to improve printing efficiency and product quality.
The benefits of printing plate gluing
In the printing process, a good printing plate will immediately be printed on the machine. Whether it needs to be glued or not, I believe that for many printing plant operators, the answer is not very clear. Strictly speaking, glue should be applied before the plate is printed on the machine. Here I first introduce the benefits of printing plate gluing.
(1) It is possible to protect the fine sand on the surface of the substrate, and to enhance the abrasion resistance of the PS plate to improve the resistance to printing.
(2) It can protect the hydrophilic layer of the plate base, improve the ink receptivity of the graphic part, and help to quickly reach the ink-water balance during printing.
(3) The printing plate can be protected from minor scratches or scratches, wasteful digital printing can be reduced, and printing speed can be increased.
(4) It can effectively seal the sand and prevent dust from entering, preventing the plate from being directly exposed to the air and causing the plate to oxidize too quickly.
It can be seen how important it is for the printing plate to be pre-printed before printing. We must have a clear understanding of this, and use as much as possible the quality control of printing plate gluing to improve the quality of plate printing and printing.
How to brush the plate
In fact, the printing plate brushing glue is very simple, that is, the protective glue and the water are mixed according to a certain proportion, and after stirring, the glue brush is formed on the printing plate to protect the printing plate.
It should be noted that when you use a manufacturer's plate, you can ask the manufacturer's technical staff to give instructions on the use of protective glue. In general, manufacturers will provide the appropriate glue for the printing plate to protect the printing plate. If the plate manufacturers cannot provide the corresponding glue, or if the printing company wants to use better glue, the operator should first ask the technicians of the plate manufacturers: what brand of glue can be used when the plate is glued, and what proportion should be used Than other. At present, the commonly used plate glue adhesive glue brand has Japanese research, Kodak, Fujifilm and other acquisitions, these brands of glue can be applied to most of the printing plate on the market.
Printing brushing methods are generally divided into manual brushing and machine brushing. Manual brushing uses brushes and other tools to brush the matching glue on the used printing plate. Because it is a manual operation, it needs to brush the surface of the printing plate several times, and the brushing effect is not even. The machine's brushing is done by the machine, the brush roller is smooth and elastic, the brushing time is faster, and the thickness of the brushing layer is relatively uniform. Most printers now use machine gluing. Below, the author will mainly talk about the problem of machine brushing.
Plate Glue Precautions
There are many issues to be noted in the machine's brushing. First of all, it is necessary to ask the following questions.
(1) When the printing plate is glued, the plate material and the glue ratio are normal?
Under normal circumstances, the protective glue and water are proportioned according to a certain proportion. According to the selected protective glue brand, the amount of water required when matching with water is also different. For example, if the glue selected is Fuji glue, the ratio of the protective glue to water is 1:3 to reach the best state of the glue ratio. At this time, the glue not only protects the printing plate from other packaging, but also easily prints. The printing ink balance is completed during printing.
(2) Are the rollers on the plate clean?
If the gluing roller is not clean during stencil printing, the operator needs to use a damp cloth to wipe the squeegee clean. If the gluing roller is glued and solidified together, the glue on the printing plate graphic part passing there will become too thick. When the machine prints, it will appear that it is not inked. If it is because the protective adhesive is not clean, you need to replace the unclean protective adhesive with a new one.
(3) Is the pressure of the rubber roller normal when brushing?
Unfavorable, the operator must ensure that the surface of the printing plate is moderately adhesive and the glue is uniform. It is also important that the glue be thick and thin and even and moderately moderate. When the glue layer is too thick to print on the machine, it is necessary to use a cleaning solution for printing and printing. If it is too thin, it will not reach the effect of the printing plate.
(4) Is the drying temperature normal after brushing?
The temperature after brushing should not be too high or too low. The drying temperature is generally between 40 and 50°C. Too high may cause a chemical reaction on the photosensitive layer on the surface of the printing plate. If the temperature is too low, the surface of the printing plate may not be glued.
(5) Is the operation correct when brushing?
I hereby make a small suggestion and hope to help everyone. When the operator gets off work early in the evening, Epson, please use a cloth to clean the rubber roller first, and then use 4 to 5 scraps to recycle and clean it once. If you stop at work for more than 2 hours, you need to use 2 to 3 scraps. Edition, check whether the layout is clean after stencil printing to ensure that all printing plates are clean and perfect.
(6) Do you usually maintain the gluing cycle system?
According to the amount of publication, the gluing cycle should be regularly cleaned, including the rubber roller, the transmission of plastic pipes, the transmission of plastic pumps, storage barrels and other thorough cleaning, usually 1 week for the benefits.
The above-mentioned experience hopes to remind the CTP system operators to have some knowledge of CTP printing plates and also hopes to help various printing companies. Printing companies can supply water according to their actual conditions, and rationally deal with printing plates after printing to improve printing efficiency and product quality.
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