New TAPPI Standard T582 – High Shear Capillary Viscosity of Coating Color on Paper and Paperboard

When it comes to paper and board coating, small things can make a big difference. One of those things is rheology – how the coating color flows under pressure. It’s a tricky subject, but understanding it is key to keeping your coater running smoothly and your product quality consistent. Now, with the release of a brand-new TAPPI standard, there’s a clear and reliable way to measure what really matters under high-speed conditions.

Why rheology matters in high-speed coating

Understanding coating color rheology is essential for quality control, product development, and optimizing coater runnability. Rheological properties are particularly important in high-speed industrial coating methods such as blade, film, and curtain coating, where coating colors experience extremely high shear rates.

These high shear conditions create complex deformations in the coating color, which must be properly controlled to maintain stable process performance and achieve consistent end-product quality.

A new standard for real-world measurement

To address this need, the newly published TAPPI Standard T582 introduces a method for measuring the viscosity of coating color at a process-relevant shear rate of 500,000 s⁻¹. The ACA AX-100 high pressure capillary rheometer is used to meet the technical requirements of the standard, providing accurate and repeatable results.

The development and approval of this standard are thanks to the valuable contributions of the Standard-Specific Interest Group (SSIG) members during the drafting and review process. This global standard supports the coating industry in developing more sustainable and efficient solutions, particularly in areas such as food packaging.

Read more about ACA AX-100

Please get your own copy of the official TAPPI standard T582 from here