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Valco Melton

By AICC Staff

January 28, 2021

Some quality managers will report that printing defects are not among the top three that they deal with throughout the year but with point of purchase boxes/trays it can be the number one complaint. In addition, print quality expectations of large key accounts are increasing and exceeding the ability of your flexo presses or operators to scrutinize output sufficiently to prevent future complaints.

The ClearVision® division of Valco Melton is introducing PrintChek™ – a camera-based tool for inspecting the entire width of every corrugated sheet in a Flexo-Folder-Gluer or Die-Cutter and analyzing it for print quality. From spots and hickeys to color registration problems, stripes, scratches and smeared, ghosted or missing print, PrintChek™ is able to compare each sheet to a standard and highlight areas of concern to be removed and inspected. Along with defect detection, PrintChek™ reads and evaluates barcodes for quality and assesses the geometry of the sheet for size, skew and trim.

width=662The principle involves several cameras installed above (top-print) or below (bottom-print) the sheet along with light modules to illuminate the sheet. Line-scanning cameras take images as the sheet passes and the image is re-assembled in order to evaluate. Minimum defects down to 2.0 mm are visible. Color measurements of a delta-E value of 3 can be resolved for accurate inspection of ink recipes and matching to desired corporate color standards. If there is no viable pdf standard available to compare to, a sample box can be run as a “golden standard.”

PrintChek™ uses the familiar ClearVision BoxChek 7 interface to activate desired inspection tests, set tolerances and view images. The live image is always visible on screen and defects are visible both as they occur and in the defect viewer. The defect viewer sorts images, provides close examination opportunities and highlights reasons for the defect being identified. Defect data are stored in SQL format and defect images are stored for later inspection.


Statistical Process Control Charts are available for select PrintChek measurements to assess machine capability and monitor how well operators are adhering to target values. The charts include all the normal SPC values plus CP and CPk reported throughout the order for various sample sizes.

MeasurementChek™ continues to serve as both a local and remote access point for production data, per box details and all of the data are stored on the local device, not the cloud.

Valco Melton is a leading supplier of gluing and inspection systems in the corrugated industry. Since 1952, Valco Melton has been selling and servicing equipment and providing robust solutions for the industry. ClearVision® products are dedicated to using vision for inspecting corrugated production and making removal of defects from the production stream possible.

Contact our sales team at 513-874-6555 or email