Common Curtain Coating Problems: Causes, Detection and Correction

Curtain coating is the deposition of a functional coating of a wax-based hot melt on a combined board surface by transporting the board through a falling film or “curtain” of the molten material.

As with any converting operation, various problems can arise, causing operational difficulties, and product defects.

The purpose of this Technical Information Paper is to identify common curtain coating problems, including how to detect those that may not be readily apparent, to list some of their causes, and to recommend corrective measures.