GMI Equipment Maintenance 2

Question 1

Which cleaning solvent is most appropriate for removing dried UV-curable ink from a flexographic printing plate?

Accepted Answer

UV-compatible plate wash approved by the manufacturer

Answer

UV-curable inks require a UV-compatible plate wash specified by the manufacturer to avoid damaging photopolymer plate material.

Question 2

During a preventive maintenance inspection of a large-format inkjet printer, technicians discover that the encoder strip is dirty. What symptom would this most likely cause?

Accepted Answer

Banding or misregistration in the print output

Answer

A dirty encoder strip causes the carriage motor controller to misread position, resulting in banding or misregistration artifacts.

Question 3

A gravure press cylinder shows signs of pitting on the chrome layer. What is the recommended corrective action?

Accepted Answer

Re-chrome and re-engrave the cylinder

Answer

Pitting on a gravure cylinder's chrome layer compromises cell integrity and print quality, requiring re-chroming and re-engraving.

Question 4

What is the primary purpose of performing a nip pressure test on an offset printing press?

Accepted Answer

To ensure uniform contact between blanket and impression cylinder

Answer

Nip pressure tests verify that the blanket and impression cylinder make uniform contact across the full width, preventing uneven print density.

Question 5

An operator notices that the doctor blade on a flexographic press is leaving streaks. After replacing the blade, streaks persist. What should be checked next?

Accepted Answer

Anilox roller for damage or worn cells

Answer

Persistent streaking after doctor blade replacement typically indicates a damaged or worn anilox roller that must be inspected.

(GMI) Graphic Measures International Certification Practice Test

(GMI) Graphic Measures International Certification Practice Test

GMI Equipment Maintenance 2