TAPPI

Why Paper Coefficient of Friction Measurement Matters Paper surfaces interact dynamically during production and application processes. The static COF measures the force required to initiate sliding between two sheets, while the kinetic COF refers to the force needed to maintain movement at a constant speed. A paper that is too slippery may lead to misfeeds, […]

Importance of the Ink Rub Test The ink rub test determines whether inks can endure mechanical stress without transferring, smearing, or fading. TAPPI T830 covers several variations, including: These assessments are vital for industries where packaging and labeling carry essential product and brand information. Strong rub resistance ensures the printed image remains intact, protecting both