In the packaging industry, duplex boards play a vital role. Used widely in carton manufacturing, their quality directly impacts customer perception through factors like print fidelity and overall appearance.

This article, the second in the three-part series, explores the listed subsequent six (from 7 - 12) commonly encountered defects in duplex board production, delving into their causes and potential solutions. These are :- High or low bulk density, Fluff, High or low ink absorbency, Low brightness, Delamination and Shade variation.

Duplex boards, primarily used in carton manufacturing, significantly affect customer perception through their quality, printing, and overall appearance. Therefore, strict quality control is crucial at both the board mill and the printer-converter stages. This ensures the desired quality and aesthetics of the final carton.

While some argue that it's impossible to achieve ideal duplex board qualities using unconventional, short-fibered pulpable materials, it's possible to produce high-quality boards by implementing proper care, precautions, and control measures. This article marks the beginning of a three-part series that explores common defects in duplex boards and outlines potential control methods to minimize their occurrence and ensure optimal board quality

Grain refers to the direction of the fibers within paper and paperboard.