Anilox BCM chart: choose volume by ink film, not LPI alone
Use an anilox BCM chart as a starting point—not a universal specification. Learn how volume, line count, ink, substrate, and measured roll condition determine the repeatable anilox choice.
An anilox BCM chart is useful for narrowing the starting range. It is not a universal recipe.
BCM means billion cubic microns per square inch. It describes the cell volume available to carry ink across a defined area of the anilox surface. Line count describes how many cell lines are engraved per inch. The two numbers work together, but they are not interchangeable: two rolls with the same LPI can carry different volumes and lay down different ink films.
A practical starting chart
Harper publishes this rough application map:
| Application | Typical line count | Typical volume |
|---|---|---|
| Heavy line and solids | 180–330 LPI | 4–9 BCM |
| Line and type | 200–400 LPI | 3–8 BCM |
| Vignettes | 360–500 LPI | 2.8–3.6 BCM |
| Process work | 500–1,200 LPI | 0.9–2.8 BCM |
Read those as starting ranges, not purchasing specifications. FTA notes that common narrow-web, wide-web, and preprint combinations can span roughly 360 LPI at 5.0 BCM to 1,400 LPI at 1.0 BCM, depending on the print requirement and substrate. Corrugated work commonly uses coarser counts and higher volumes.
Choose the ink film first
The job does not print with an LPI number. It prints with the ink film the roll transfers.
A higher volume can help solids, whites, coatings, or absorbent substrates reach coverage. Too much volume can increase dot gain, close reverses, muddy type, slow drying, and make fine process work harder to control. Lower volume supports thinner, cleaner films—but only if the ink still reaches the required density and color.
The useful question is not “Which BCM matches this LPI?” It is:
What is the thinnest repeatable ink film that still reaches the approved color and coverage on this press, with this ink and substrate?
A banded-roll test, run with the ink supplier and anilox supplier, is more reliable than choosing from a generic chart alone.
Nominal BCM is not always usable BCM
The engraving on the roll certificate is only the starting condition. FTA warns that plugged cells can transfer less than half of their designed volume, even when obvious wall wear is not visible. Wear can also make cells shallower over time.
That means a rerun can drift even when the operator mounts a roll labeled with the same LPI and nominal BCM. If the current measured volume, cleaning state, or roll identity is missing, prepress and press are not working from a complete print condition.
Put the validated combination on the job
For repeat work, record:
- press, station, and anilox roll or sleeve ID;
- nominal and measured BCM;
- line count and cell geometry;
- ink system, viscosity or other shop control, and substrate;
- plate screen ruling and screening condition;
- approved density, color, or coverage target;
- last audit, cleaning, and condition status.
This turns an anilox chart into what it should be: a way to choose a test range. The approved press condition—not operator memory—then becomes the specification for the next run.
Anilox BCM FAQ
What does BCM mean on an anilox roll?
BCM means billion cubic microns per square inch. It describes the cell volume available to carry ink over a defined area of anilox surface.
Is there a universal anilox BCM chart?
No. Published charts are starting ranges. Ink, substrate, cell geometry, line count, plate screen, target density, press condition, wear, and cleanliness all affect the usable choice.
Should volume or line count be specified first?
Start with the ink film the job needs, then select a compatible line count and geometry. LPI alone does not define how much ink a roll will transfer.
What belongs on the job ticket?
Record the press, station, roll ID, nominal and measured BCM, LPI, geometry, ink, substrate, plate screen, approved target, and the roll’s latest audit or cleaning state.
Sources and related reading
- Harper Corporation: Anilox Volume — BCM definition, application ranges, thin-film guidance, and banded-roll testing.
- Flexographic Technical Association: Shape, Volume, Count — industry ranges, cell geometry, substrate differences, wear, and plugged-cell effects.
- Anilox line screen selection — how LPI, volume, and plate screen ruling work together.
- Flexo ink consumption calculation — how anilox volume fits into an ink estimate without becoming a promise of transferred volume.
- Flexo printing defects — a plate-versus-press diagnostic for dirty print, poor transfer, and repeatable defect reporting.