TERMIUM Plus®

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OPTICAL BLEACHING AGENT [1 record]

Record 1 1998-08-12

English

Subject field(s)
  • Pulp Preparation (papermaking)
  • Measuring Instruments (Engineering)
DEF

Optical devices, which, by measuring the colour changes in pulp as delignification progresses, can continuously monitor the degree of bleaching or brightness of a pulp slurry at different stages along the bleaching operation so that the flow of bleaching agent required in a bleaching stage can be controlled either manually or electronically. The optical information obtained can be used to control flows upstream from the measuring point, which is called a "feedback" system, or the information can be used to control flows downstream from the measuring point, which is called a "feed forward" system.

French

Domaine(s)
  • Préparation de la pâte à papier
  • Instruments de mesure (Ingénierie)
DEF

Dispositifs optiques, qui, en mesurant les changements de couleur de la pâte à mesure que la délignification progresse, permettent d'évaluer le degré de blancheur de la pâte liquide à différents stades afin que le débit d'agent de blanchiment requis à un stade puisse être contrôlé à partir des débits en amont du point de mesure (contrôle par rétroaction), ou pour contrôler les débits en aval de ce point (contrôle par prédiction).

Spanish

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