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Customer case:

Preventing chemical overdoses with Valmet WEM at Drewsen

Drewsen Spezialpapiere GmbH & Co. KG is a manufacturer of uncoated wood free specialty papers such as security papers, technical specialty papers, and printing and publishing papers. When faced with a challenge of high number of web breaks, Drewsen decided to install a Valmet Wet End Analyzer (Valmet WEM).

 Retention and charge measurements on PM2
Summary
Location Lachendorf, Germany
Challenge

High number of web breaks.

Deposits and unplanned shutdowns.

Chemical overdosages with both existing and new paper grades.

Solution

Valmet Wet End Analyzer (Valmet WEM) was installed with retention and charge module.

Profound process analysis was based on WEM measurements.

Online consistency and retention measurement revealed key issues in the process.

Better control of clear filtrate in flotation.

Retention chemical dosing based on white water consistency measurement.

Results

Reduction in web breaks.

The mill was able to avoid chemical overdosages.

Unplanned cleaning downtime was prevented.

Reduction in cost of process chemicals.

Total savings are approximately €100,000.

Keywords Board and paper, Automation, Europe

Wet End Analyzer

Valmet WEM combines in a unique way all the relevant wet end variables for the total solution of wet end management. It measures simultaneously from up to six sample points.