Scoring lines on anilox rolls

What is one of the worst problems that can happen in the flexo pressroom? One anilox roll damaged by scoring lines means stopping a production or accepting a print defect. Why do these scoring lines occur on the anilox surface? What happens in printing? What can we do to prevent this problem? I gathered [...]

2021-06-17T09:12:41+00:00Tags: , , |Comments Off on Scoring lines on anilox rolls

Oh no… Streaks again!

Have you ever experienced any problems like streaks, gearmarks, banding, bouncing and the like? In this short video I try to explain some of the most common causes at the origin of these defects in flexographic printing. Are you interested in customized training in flexography? Contact me! Don't miss flexo•expert news: subscribe to [...]

2021-05-17T11:06:43+00:00Tags: , , |Comments Off on Oh no… Streaks again!

Do you really think that dot dipping doesn’t exist?

I recently came across an interesting video that was published by one anilox rolls manufacturer that, in the attempt of promoting their technology, depicts dot dipping as an industry myth and illustrates flexo users, who believe that this problem exists, as troglodytes... "The industry myth that dot dipping is occurring within the anilox cells is impossible. Physics [...]

2018-07-28T10:27:46+00:00Tags: , , , |1 Comment

Dot bridging

Dots in midtones screened areas, that normally should appear separated on printing, bridge together causing a dirty aspect on printed product. Main addressable cause is anilox volume too high for the selected plate linescreen, or, viceversa, plate linescreen too high for the available anilox volume. The ink, collected by the printing surface of the [...]

2018-07-28T10:27:29+00:00Tags: , , |2 Comments

Plate cracking with water based inks

Plate is damaged with little cracks when using water based inks. Such fissures are evident both on plate surface and on printed product. This particular issue happened in a plant printing corrugated post-print with water based inks. The water based inks are characterised by the presence of amines in the formulation and have a [...]

2018-07-28T10:27:04+00:00Tags: , , , |Comments Off on Plate cracking with water based inks

Dot dipping (in anilox)

Dot dipping describes the condition whereby the smallest dots on a flexo plate dip into the cells of the anilox roll when forced by the impression between anilox and plate. Some dots of the plate, dipping in the cells, will carry more ink than what was expected, resulting in dirty printing in highlights, typically [...]

2018-07-28T10:26:48+00:00Tags: , , , , , |Comments Off on Dot dipping (in anilox)

Hollow dots, like donuts, perforate ink layers

Ink builds around small print elements like dots and small type creating hollow shapes like donuts. Inked dots perforate ink layers that were printed by previous printing groups. This happened on external print on plastic film, solvent based inks, flat-top plate, sequence YMCK. Combined action of excessive impression with high ink volume and [...]

2018-07-28T10:26:31+00:00Tags: , , , , , |Comments Off on Hollow dots, like donuts, perforate ink layers