CAPATCH^®

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The Flexo industry

Summary of how it works

The Capatch is a cell volume tester for anilox and gravure full coating rolls.

Capatch is a use-one-time tool that works by contact with the roll as a kind of sticker. A calibrated amount of indicator fluid contained within a capsule on the sticker is forced across the roll under the Capatch sticker when the user runs across the surface with a blade, known as the doctor blade. The blob of indicator fluid breaks through the front of the capsule and is pushed into the open cells of the roll by the doctor blade. The liquid blob first fills the cells nearest the capsule, decreasing in volume as it is pushed forward, until the entire volume of the blob has vanished into the roll cells. The length of the liquid track determines the current volume of the open cells of the roll. Since the volume of the indicator fluid is constant in all Capatch strips, the length of the track is inversely proportional to the ink, adhesive or coating volume of the roll cells.

A scale is printed on the Capatch and enables the user to read the volume directly against the track.
Three different scales:

• low volume 2 to 7 cc/m2 and 1.25 to 5 BCM/inch2 (green - orange strip)
• medium volume 5 to 25 cc/m2 and 3 to 15 BCM/inch2 (blue - orange strip)
• medium volume 5 to 25 cc/m2 and 3 to 15 BCM/inch2 (light blue - orange strip)
• high volume 15 to 70 cc/m2 and 10 to 50 BCM/inch2 (red - orange strip)
• tri-helical volume 4 to 70 cc/m2 and 2 to 50 BCM/inch2 (brown - orange strip)

Units of BCM/sq inch are used in United States of America while CC/m2 are used throughout the entire rest of the world.