Articles

Paper & Board Process Diagnostics

Investigating MD and CD variation, barring and vibration, and their likely process and machine sources.

Articles on this topic

Paper & Board Process Diagnostics4 June 2026

Hidden variations in paper and board machines: when online scanners miss the real variation

Why a traversing scanner can miss variation that roll hardness profiles and laboratory CD and MD measurements show, and how to investigate the likely cause.

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Measurement Technology & Analytics26 March 2026

Continuous porosity profile measurement of paper, board and nonwovens

See how continuous porosity profiling reveals small-scale MD and CD variation in paper, board and nonwovens that spot measurements can miss.

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Paper & Board Process Diagnostics6 January 2026

How Tapio Analysis Helps Solve Barring Problems

Identify the barring frequency in MD caliper data, then compare sensor channels to see whether the wet end, pressing or coating is the likely source.

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Measurement Technology & Analytics26 November 2025

How Product Variations Can Cause Winder Vibration

Periodic thickness variation in paper can stack up in the roll and excite winder vibration. Findings from Tapio Analysis cases and research with Aalto University.

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Paper & Board Process Diagnostics31 July 2025

Optimizing paper and board machine CD profiles with Tapio Analysis

True CD profiles measured from CD strips, without MD distortion, reveal localized profile defects, edge regions and excess basis weight that QCS scanners can miss.

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Measurement Technology & Analytics10 May 2025

Find likely machine-element sources with Tapio MD Analysis

Use MD spectral analysis to match periodic variation in paper and board to rolls, felts, wires and pumps, then narrow down the source with multi-sensor data.

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