Platemaking process
There are two kinds of plate making methods: ordinary and computer-to-plate (CTP). This section will provide guidelines for both processes.
General process
For good print reproduction, it is crucial to precisely transfer images from the film to the plate. Improper exposures on the negative working plate will result in excessive dot gain. Here are some guidelines:
Follow the manufacturer's specifications to maintain the plate and developer.
Use the test image at least once a week to evaluate the exposure effect of the plate, such as: UGRA, RIT Microline, or GATF Plate Control.
Use a Stouffer ruler every day to maintain exposure.
When the plate control bar is physically damaged or discolored, it should be replaced promptly. The cycle schedule for replacement depends on how each control bar is used and stored. Manufacturers should provide guidelines on the maintenance and life cycle of the control strip.
All plates use hard dot negatives for printing.
In order to obtain the accurate printing effect, the vacuum control of the printing plate is very important.
Computer-to-plate (CTP)
The computer-to-plate process prints digital files directly onto the media rather than paper or film. The platesetter directly outputs the documents onto the plate as if the traditional imagesetter had exported the documents to film or paper. The rules for file preparation and management described above are not only suitable for film output, but also for CTP output. However, there are two major differences between the output film and the output plate. First, even with a perfectly calibrated digital prepress system and platesetter, plates with CTP technology cannot achieve the same dot gain/Tone Value Addition (TVI) as compared to plates that are made with film printing. Second, because the CTP system does not have proofs printed, proofs cannot be made for the final document.
The following is a guide to the CTP process:
With suitable proofs, the exposure and development conditions of digital plates are checked weekly, for example: digital UGRA images, color scales provided by RIP suppliers. Obey CTP manufacturer's suggestion, use the density meter to measure the color value on the printing plate, just like the printing sheet on the test press. Use a suitable reflection densitometer, or other replacement equipment, to test the dot value on the plate.
Due to the elimination of contact exposure, there is usually a 3% to 5% dot gain/total value increase (TVI) on CTP plates. In the CTP process, the dot gain/TVI value can be controlled from RIP
There are two kinds of plate making methods: ordinary and computer-to-plate (CTP). This section will provide guidelines for both processes.
General process
For good print reproduction, it is crucial to precisely transfer images from the film to the plate. Improper exposures on the negative working plate will result in excessive dot gain. Here are some guidelines:
Follow the manufacturer's specifications to maintain the plate and developer.
Use the test image at least once a week to evaluate the exposure effect of the plate, such as: UGRA, RIT Microline, or GATF Plate Control.
Use a Stouffer ruler every day to maintain exposure.
When the plate control bar is physically damaged or discolored, it should be replaced promptly. The cycle schedule for replacement depends on how each control bar is used and stored. Manufacturers should provide guidelines on the maintenance and life cycle of the control strip.
All plates use hard dot negatives for printing.
In order to obtain the accurate printing effect, the vacuum control of the printing plate is very important.
Computer-to-plate (CTP)
The computer-to-plate process prints digital files directly onto the media rather than paper or film. The platesetter directly outputs the documents onto the plate as if the traditional imagesetter had exported the documents to film or paper. The rules for file preparation and management described above are not only suitable for film output, but also for CTP output. However, there are two major differences between the output film and the output plate. First, even with a perfectly calibrated digital prepress system and platesetter, plates with CTP technology cannot achieve the same dot gain/Tone Value Addition (TVI) as compared to plates that are made with film printing. Second, because the CTP system does not have proofs printed, proofs cannot be made for the final document.
The following is a guide to the CTP process:
With suitable proofs, the exposure and development conditions of digital plates are checked weekly, for example: digital UGRA images, color scales provided by RIP suppliers. Obey CTP manufacturer's suggestion, use the density meter to measure the color value on the printing plate, just like the printing sheet on the test press. Use a suitable reflection densitometer, or other replacement equipment, to test the dot value on the plate.
Due to the elimination of contact exposure, there is usually a 3% to 5% dot gain/total value increase (TVI) on CTP plates. In the CTP process, the dot gain/TVI value can be controlled from RIP
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