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gordo , I have just read again your blog print-guide. And I understand your advice about rosette drift. 45 or 90 could not be exact 45 and 90 degree on the plates. Then I will get rosette drift in printout even trying to do as good registration as possible. Remedy could be shift the screen...

We had tried to print this job on the other machine (older machine) then the result is worse. The machine which we are using to print this job is a brand new famous German sheetfed machine. It is a good machine, and has been qualified by test jobs. I dont think any mechanical issue in it. The...

Dear Gordo, Thank you for your explanation! Now I understand clearly, and will try to find the way to deal with this. best regards, DeltaE

Alois, You are right, all answers are YES. rgds / deltaE

My problem is the grey of picture in lower left, lower right and upper right are same, but the grey in upper left is more yellowish than others. regards, DeltaE

gordo Please explain more about "...Another possibility is rosette drift. That is the result of the halftone screen not being optimized for the plate size. Rosettes are high frequency moirés. If the frequency of the moiré is not optimized for the size of the plate then the rosette will drift...

Hello! I have an issue with a job (please check the attached picture for more detail) - sheet size 750 x 540 mm, 157 gsm, coated paper. - CMYK job with color sequence KCMY - We print on a sheeted offset machine, just installed 4 months ago. - I let machine run stable and take a sample sheet. -...

Today I have printed that job with strong GCR as Gordon s advice. The color is much stable then before. I am very appreciated with your comment and advice. Once again Thanks a lot! Regards, DeltaE

I mean the uniform of the dots is very important for printing. I an dealing with some gray tone jobs and it is very sensitive to any difference of dot shape and the color registration. I am using AM round 175 lpi screen angle C 75, M 45, Y 90, K 15, exposed by a CtcP. I just would like to know...

Hello Guys, Could please tell me your opinion and your experience when comparing between CTP (thermal) and CtcP (visible). About the plate quality, the uniform of the dot area and the distortion of the plate due to effect from heat (when exposing). Which one has more influence to the print...

Thank you Mr. Gordo! That's the thing I am trying to use GCR to apply on the image via Photoshop. When I check on PDF file (the file for plate making), I can found that separation value of the gray area is changed from: C 49%, M 35%, Y35%, K 0% to C 29%, M 15%, Y 12%, K 38% I will try on press...

Hello Sirs, I am a print manager of a CD102 brandnew. And I am facing to a problem of gray tone. Could you please spend sometime to read and give me some advice? when I print a gray tone with AM, there is color variation between sheet and sheet. There is no doubling and slurring on it. The...

Ink density variation during printing process always happens. But you can control it: - run enough make-ready sheet then take sample sheet. Check it by visual or by spectrometer, correct it if you want. Repeat until you accept with the color. Then full speed ahead. So you have only 1 kind of...

Congraz guy! I think the coating suppier should add some wax to make the coating layer more flexible after dried.

So can you firgure out what the problem is from? Can you share it?

Story now is clearer. In my opinion, I think you should make the list of things which can have influnce to your each batch: - Vicosity of UV coating - Ink coverage - Type of UV ink - Speed of printing and coating machine - Power of UV curing system - Power of IR drying system (If usage) - etc...

If I right understood, you got the cracking on the printing ink layer and coating layer. So you need to reduce to the IR dryer as low as possible to minimize the heat inside ink layer. The other reason is too thick ink film. You can ask prepress or designer to reduce to ink film thickness; you...

BTW, could you pls tell me how the Landa's nanography now?

I mean the leakage from broken hoses could cause insufficient suction force of sheet brake. That's true it should be easy to adjust the XL75 delivery if that is new machine. But your machine is used, so I think its delivery need to be checked by service guys. Hope you fix your issue soon...

Are you running 60 gsm material? If it is true, you do not need to use 100% suction air of sheet brake. Please check the suction air of each sheet brake! I have had this kind of problem with thin material in the past, then I firgured out that there was no suction force from sheet brake. The...