Quality Control Systems (QCS)

2017-01-08T00:14:27+00:00 Categories: Control Systems|Tags: , , , , , , , |

Quality Control System (QCS) 9.2.1 Quality Measurements Scanning Measurement Most paper quality measurements in the paper machine are scanning measure¬ments. In various locations so called “scanners” with usually one upper and one lower measurement head are found (Fig. 9.2). Both measurement heads move synchronously across the paper width. One scan takes about 20 to [...]

Aluminum Compounds for Paper

2011-12-02T21:43:43+00:00 Categories: Chemical Additives|Tags: , , , , |

Aluminum compounds are widely used in the paper industry: in rosin sizing, as drainage and retention aids, and as fixing agents for anionic trash (dissolved or­ganic compounds e. g. extracts from wood fibers, degraded starch). Important ap­plications are the treatment of circuit water and effluents or the thickening of sludge, where the flocculation and precipitation [...]