In the printing industry, BCM is a key technical parameter representing one billion cubic micrometers (1 billion μm³); it serves as the base unit for measuring the ink volume capacity of the engraved mesh cells on an Anilox Roll in flexographic printing or on the plate carrier in gravure printing.
In other words, 1 BCM is defined as the amount of gravure material that can be accommodated per square inch of screen roller surface – specifically, 1 billion cubic micrometers of gravure material (conversion factor: 1 BCM ≈ 1.55 cm³/m², or approximately 1 microliter of volume).
- The core role of BCM in printing
The ink film thickness and color penetration determine the BCM value: the magnitude of the BCM value directly dictates the amount of ink that can be applied. BCM refers to the humidity level that the screen roller can convey and transfer to the printed substrate; this printed color humidity also influences the process.
Precise consumption control: An appropriate BCM ensures absolutely uniform printing or ink thickness. If the BCM is too low, it may result in exposed areas or insufficient ink transfer; if the BCM is too high, the ink may overflow, causing fine text to appear thicker, dots to expand, or even paper smudging.
- Common BCM configurations for printing applications
Different printing products have varying BCM requirements:
| Printing Type / Requirements | Recommended BCM range | applicable scene |
| High-precision dot matrix printing | Lower BCM (e.g., 1.5–3.0 BCM) | High-end labels, exquisite portrait images, or high-resolution digital image printing |
| Text and Line Printing | Medium BCM (e.g., 3.0–5.0 BCM) | Instructions on the packaging bag; oats; standard design |
| Large-area actual printing | Secondly, BCM (e.g., 5.0 – 8.0+ BCM) | Large base area for cardboard boxes; packaging boxes requiring color application. |
| Specialized robots / Finishing | Very high BCM (e.g., 10.0+ BCM) | Finishing oil (varnish), composite adhesive, white ink base coat |
Common industry misconception: BCM is not the same as the number of network cables (LPI).
During procurement or equipment relocation, there is often confusion between BCM and the LAN cable count (LPI, Lines Per Inch).
LPI (Line Per Inch): Represents the number of dots per inch, determining the print resolution.
BCM (Volume): Represents the total capacity of the mesh aperture.
A screen roller with an LPI of 800 may exhibit entirely different BCM values depending on the depth or shape of its screen apertures.