Flexo Highlight Dots

[SteveSuffRIT]

Print Process: Flexo, wide web
Substrate: White Poly film
Ink: Solvent based (heatset)
Anilox: 1,000 lpi
BCM: 2.0 billion cubic microns
% Dot Size (file): 1%
Lpi: 133
Quality: Too much pressure (anilox>plate, plate>film) causing hollow center dots (donuts) with halo ring fringe.
Measurement: Will traditional densitometer or spectrophotometer measure this correctly for Tone Value Increase (TVI)?

 

[gordo]

Print Process: Flexo, wide web
Substrate: White Poly film
Ink: Solvent based (heatset)
Anilox: 1,000 lpi
BCM: 2.0 billion cubic microns
% Dot Size (file): 1%
Lpi: 133
Quality: Too much pressure (anilox>plate, plate>film) causing hollow center dots (donuts) with halo ring fringe.
Measurement: Will traditional densitometer or spectrophotometer measure this correctly for Tone Value Increase (TVI)?

As you know, neither densitometers nor spectrophotometers measure dots - they just measure tones from which dot gain is calculated. So I don't see why densitometers or spectrophotometers wouldn't be able to be used to determine dot gain/tone value increase. The fact that the dots are doughnuts is irrelevant.
However, basing dot gain/tone value increase on a faulty press sheet is a problem - unless the printer prints with that fault as their normal print standard.

 

[nixsensorltd]

Agree with Gordo. Spectrophotometers and Densitometers will accurately measure the sample, but they will not provide any evaluation of the dot quality.