GMI Troubleshooting & Problem Resolution 2

Question 1

A print job shows banding artifacts running perpendicular to the paper feed direction. What is the most likely cause?

Accepted Answer

Clogged or misfiring inkjet nozzles

Answer

Horizontal banding perpendicular to paper travel is a classic symptom of clogged or intermittently firing inkjet nozzles that skip rows of dots.

Question 2

A customer reports that printed Pantone colors look correct on press but shift significantly when the job is laminated. What should be investigated first?

Accepted Answer

The laminate's optical brightener content and UV absorption

Answer

Laminates containing optical brighteners or UV-absorbing layers alter perceived color, particularly shifting neutrals and cool tones after application.

Question 3

When troubleshooting a flexographic press showing inconsistent dot gain across the web width, the technician should first check:

Accepted Answer

Impression pressure uniformity across the cylinder

Answer

Uneven impression pressure across the cylinder width creates differential dot spreading, producing variable dot gain from edge to edge.

Question 4

Color proofs consistently appear more saturated than the final press sheet. After confirming the proof substrate is correct, what is the next diagnostic step?

Accepted Answer

Verify the press ICC profile matches current press conditions

Answer

A press ICC profile that was built under different conditions will cause systematic mismatches between proof predictions and actual press output.

Question 5

A UV ink shows poor adhesion on a flexible plastic substrate even after curing. Which corrective action is most appropriate?

Accepted Answer

Apply corona or flame surface treatment to the substrate before printing

Answer

Flexible plastic substrates require corona or flame treatment to raise surface energy so UV inks can wet out and bond properly.

(GMI) Graphic Measures International Certification Practice Test

(GMI) Graphic Measures International Certification Practice Test

GMI Troubleshooting & Problem Resolution 2