Technical Information

CTP is not only a plate making machine, but also positively affects the improvement of printing quality and efficiency. For example, it can avoid the defects of dot loss, deformation and expansion, reduce the loss of color and layer, shorten the time for ink color adjustment and registration adjustment, and the time for ink ink balance in the printing process, thereby greatly improving the printing quality and production efficiency.

From the perspective of color management, it is necessary to control dot gain, ink preset (CIP3/4), ink density, chromaticity (Lab), overprint, etc. These quality factors are closely related to the selection and use of CTP equipment. Therefore, we should not only select a good CTP, but also make good use of it.

How to select CTP?

Choose the first step of CTP photosensitive or thermosensitive?

In terms of CTP selection, we should first know what technologies are available in the market. In the technical camp, there are thermal CTP and photosensitive CTP. From the market share, there is no doubt that thermal CTP has occupied the mainstream and is unstoppable. More than 95% of printing plants choose thermal CTP. The reason is obvious: the most important thing is that the stable exposure control of thermal CTP, which means stable dot, is the basic condition for good color management.

　　

 

　　

 

Choose the square dot or round dot in the second step of CTP?

　　

 

　　

 

　　

 

It is obvious that square outlets are better than others in terms of tax and profit;

The frequency modulation screening of 10 microns can be achieved, which is also the unique ability of square laser dot technology. This is why square dot is basically selected for high-precision printing and 3D high-definition printing in the market.

Select the CTP third step edge detection function - maintain accurate registration

　　

 

Select CTP step 4 auto focus function - compatible with more plates/exception handling

How to adapt to plates with different brand quality in the market? Even in case of small dust or abnormality on the surface of the printing plate, if the automatic focusing function is provided, CTP will easily deal with it to ensure perfect exposure under various circumstances.

Select the CTP fifth step temperature compensation function to ensure accurate registration of the patched version

The aluminum plate can stretch 0.1mm when the temperature changes by 10 ° C. Then, how to ensure the registration of printing plates and make-up plates made at different times? The temperature compensation function can make up for these differences.

　　

 

Select CTP Step 6 FM screening - higher precision printing

　　

 

　　

 

When the following problems occur in production:;

　　

 

Or when higher precision printing is required, such as 3D printing and high-definition printing. FM screening will be a better solution.

　　

 

Choose the CTP Step 7 Rinsing free and environment-friendly CTP version - calmly deal with environmental issues

　　

 

How to make good use of CTP? The first step to make good use of CTP

State standardization of CTP and printing machine

-Set exposure according to plate characteristics

-Accurately set the printing speed and developer supplement

-Liquid medicine circulation setting

-Developer temperature and PH value are within the standard range

-Adjust brush pressure

-Regularly check and replace the filter element

-Check plate thickness/flatness

-Room temperature and humidity (temperature: 20-25/humidity: 50% - 60%)

　　

 

-Measuring instrument required: water tank detector, Hanna four in one recommended

　　

 

The second step of making good use of CTP is to correctly use the plate measurement and control strip

The measurement and control strip is a common tool to control the printing plate quality. The operator must understand the role of each control module on the measurement and control strip, correctly set the parameters of the CTP equipment, and understand the equipment status.

　　

 

Make good use of the third step of CTP: network expansion control printing plate

-The dot gain on the CTP printing plate should not exceed 1%, otherwise a linearization curve should be made to control the dot gain caused by CTP itself within 1%;

-Need plate curve correction tool

Kodak Harmony

-Measuring instrument required: Aiselei icplate II plate detector

　　

 

Make good use of the fourth step of CTP: dot gain control printing

-During the printing process, the press will deform the blanket to a certain extent when it is imprinted. In addition, the tension of ink and the adsorption force of paper will change the area of the dot, and the edge of the dot will expand around, forming a dot expansion. The state and material of each printing machine are different, so the dot gain is also different. When there is a certain gap between the measured dot gain and the printing standard, the printing plate curve correction tool should be used for dot compensation again.

-Expanded value of standard outlets:

　　

 

-Need plate curve correction tool

Kodak Harmony

-Measuring instrument required: Ashley eXact spectrophotometer

　　

 

　　

 

Make good use of the fifth step of CTP ink presetting - CIP3/4

The greatest progress of CTP is to digitize printing information;

1. The printing plate transfers graphic information and dot from pre printing to the printing machine;

2. The ink amount and ink level information required for printing are transferred to the printer through CIP3/4 files. At this time, the setting of CIP3/4 output before printing is very important;

　　

 

3. The printing work order information is continuously collected from the process of document production, typesetting and plate making, and finally transmitted to the printing machine, and the whole process is transmitted in JDF format;

　　

 

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