Articles

Articles

Case studies and explanations from Tapio's specialists on roll hardness and winding, paper and board process variation, measurement methods, and dirt counting and print quality from scanned samples.

All articles

Measurement Technology & Analytics21 September 2026

PapEye Dirt Count in tissue and paper mills: scanned samples instead of manual dirt counting

The first PapEye Dirt Count deliveries to tissue and paper mills replace counting dirt by eye. Detectable speck sizes, scanner requirements and folder statistics.

Read article

Measurement Technology & Analytics20 September 2026

Measuring CD Mottling Profiles with PapEye Print Uniformity

A Tapio customer scans a set of sheets from known CD positions as one batch and measures them with PapEye Print Uniformity to produce a CD profile of mottling.

Read article

Roll Hardness & Winding10 June 2026

Roll Hardness Profilers for Paper, Board, Films and Foils Compared

Compare roll hardness profilers for paper, board, films and foils by measurement speed, profile detail, data handling and suitable applications.

Read article

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.

Read article

Measurement Technology & Analytics12 May 2026

Multiple Regression for Predicting Paper Basis Weight

A Tapio Measurement Technologies thesis study explores basis weight measurement using optical transmissivity and caliper data with regression analysis.

Read article

Roll Hardness & Winding23 April 2026

Hidden roll defects are costing you more than you think

Hidden roll defects pass regular quality control but cause web breaks, waste and instability in converting. Learn how roll hardness profiling helps reveal them.

Read article

Roll Hardness & Winding26 March 2026

Using Hardness Variation (CV%) to Identify Defective Rolls

Learn how CV% from roll-hardness profiles helps identify inconsistent rolls, compare production quality and establish practical warning limits.

Read article

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.

Read article

Roll Hardness & Winding15 January 2026

Finding soft plastic film rolls before converting with roll hardness profiling

A plastic film producer had about 25% of its rolls rejected in converting. Hardness profiles at the rewinder revealed a soft edge roll that visual checks missed.

Read article

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.

Read article

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.

Read article

Roll Hardness & Winding5 September 2025

Roll Hardness Profiles – What Can the Statistics Tell Us?

What mean, standard deviation, CV%, min, max and peak-to-peak tell you about a roll hardness profile, and how to use them to flag unevenly wound rolls.

Read article

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.

Read article

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.

Read article

Roll Hardness & Winding10 May 2025

Hidden defects in rolls: a closer look with Tapio RQP Live

Three roll cases measured with Tapio RQP Live: hardness variation consistent with uneven film tension, hardness following film thickness, and soft paper roll edges.

Read article