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Calibration Print Job

This is the same test familiar to the eye of the average printer that print shop owners are asked to print. This test also identifies some defects in the sheet transfer system and the perfecting device. But mostly this test shows the technological problems of a particular printing house, such as incorrect ink selection, dampening, humidity in the printing room, etc.

Printing Test 3

Print Process Test

Print in 4 CMYK colours from our Process Calibration file to produce a colour image with various printing process controls. To check the performance of the spectrophotometric colour control and to supplement and confirm the results of the Karo test.

Important: this test alone does not give a complete picture of the technical condition of the machine, as the print parameters to be checked are mainly related to the technology and consumables used by the print shop.

Why This Test Is Important?

The calibration scale is the same test that is familiar to the average printer and requested by printing house owners.

This test is used to calibrate the printing process and calibrate the printing machine control device, such as Axis Control, Image Control, Densitronic S, and LITHEC Lithoscan Professional.

Of course, this test also reveals some defects in the sheet transfer system and the turning device. However, it is not suitable for testing a used machine – it primarily demonstrates the technological features of a particular printing house.

Procedure:

During test printing, achieve optimal registration alignment and check the operation of the spectrophotometric device and powder sprayer. Pay attention to additional printing parameters. Set aside at least 5 test sheets and mark them as in the previous tests.

Test duration: 1-2 hours

Amount of paper: The required number of sheets is 100-150 per unit.

Requirements: Blankets tension checked with a torque wrench.
BCMY ink order.

If a perfector unit is present, it is mandatory to use units before and after it. Printing in 4+0 mode.

Printing is performed from the file issued by us. Applicable screening is 150 l/inch.

Printing speed 70% of the maximum press speed.

Required amount of paper 200-250 sheets per unit.

Don't Forget That...

Colouristic characteristics of different printing inks

When testing the spectrophotometric devices of printing machines, it must be taken into account that printing inks from different manufacturers have different colour characteristics. The use of different pigments in the production of inks means that the machine must use different colour profiles to achieve the desired colour.

This problem has been recognised for a long time. At one time, GretagMacbeth specialists conducted a number of tests, compiled the colour characteristics of the different paints available at the time, and created a spectrum map.
The diagrams show the comparison of different colours with the ISO-12647-2 standard when measured on black and white.

https://pressinspection.com/wp-content/uploads/2024/10/coloristic-min-scaled.jpg

https://pressinspection.com/wp-content/uploads/2024/10/cyan.jpg

https://pressinspection.com/wp-content/uploads/2024/10/magenta.jpg

https://pressinspection.com/wp-content/uploads/2024/10/yellow.jpg

Measurements on all colours are taken at the maximum achievable grey balance with an even gradation characteristic.
Measurements were made on Gretag Macbeth Spectrolino, D50, No filter

© Alexander Pylsky, Mikhail Sartakov, cielab.xyz

PressInspection.com - Inspections of the machines for printing, technical assessment if you buy on Pressxchange, PressDepo or Roepa, for print shops and machinery dealers

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Printing Test 2

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The task of the test is to determine the condition of the sheet transfer system as a whole and between individual units. With the help of decoding of this test the general condition of the sheet transfer system at all - grippers and the perfecting device.

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Printing Test 3

Calibration Print Job

The task is to produce a colour image with various printing process control elements. This test alone does not give a complete picture of the condition of the press, because parameters are mostly related to the technology and the consumables used.

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