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PulpEye installs online analyzer at kraft pulp mill to measure crill

November 30, 2020  By P&PC Staff

PulpEye has now installed 30 of its CrillEye online analyzers around the world since launching the technology in 2013.

The 30th installation was completed recently at a kraft pulp mill in Europe.

The technology, developed in cooperation with Innventia, makes it possible to measure the amount of crill in a pulp suspension.


This helps to calculate and control tensile, tear, burst, Scott Bond, z-strength bulk and density in combination with fibre data.

Crill consists of fibrils that are about 100 times thinner than fibres, and that are invisible for traditional camera technology.

Even though crill represents only approximately one per cent by weight of the particles in a suspension, it may contribute to as much as 50 per cent of the free surface.

The more crill found on and around fibres, the better binding ability they have, which in turn results in a stronger paper and board.

The original technology was invented at Innventia, now a part of the Swedish research institute RISE, and in 2013 the cooperation between Innventia and PulpEye resulted in the CrillEye module.

The introduction of CrillEye and the ExtractEye software has led to PulpEye’s PulpOnTarget concept, now in use in more and more pulp and paper mills.

PulpOnTarget makes it possible to use analysis data to run the pulp production closer to quality targets with less deviations, making the pulp quality more consistent and also easier to switch between different pulp grades.

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