CPT Printing & Decoration Technologies 3

Question 1

Digital inkjet printing in packaging is best suited for which production scenario?

Accepted Answer

Short runs with variable data and fast changeovers

Answer

Digital inkjet excels at short runs and variable data printing because it requires no plates and can change artwork job to job.

Question 2

In offset lithography, the image and non-image areas of the plate are separated by:

Accepted Answer

Chemical differences exploiting oil-water repulsion

Answer

Offset litho plates are chemically treated so image areas accept oil-based ink while non-image areas accept water and repel ink.

Question 3

Which substrate surface characteristic most significantly affects ink adhesion?

Accepted Answer

Surface energy (dyne level)

Answer

Surface energy, measured in dynes/cm, must be higher than the ink's surface tension for proper wetting and adhesion.

Question 4

Laser scoring and laser ablation in packaging decoration are examples of which decorating category?

Accepted Answer

Subtractive surface modification

Answer

Laser processes remove or alter material from the surface (subtractive), creating effects like matte windows or hinge lines without adding ink.

Question 5

The term 'misregister' in multicolor packaging printing describes:

Accepted Answer

Misalignment between successive color layers

Answer

Misregister occurs when color separations do not align precisely, producing blurry edges or color fringing on the printed image.

(CPT) Certified Packaging Technologist Practice Test