WebAug 2, 2013 · First-pass retention values can be calculated from just two consistency measurements, the headbox consistency, and the white water consistency. There is a … WebOct 15, 2024 · First pass retention is defined by 100% × (HB-WW) / HB where HB is the filterable solids content at a given time in the headbox and WW is the filterable solids in the white water or “tray water” that flows through the forming fabric (WW is sometimes a combination of tray and press section filterable solids).
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http://www.papergrease.com/glossary/first-pass-retention/ WebDec 13, 2024 · First Pass Retention (FPR): All 10 machines noted an increase in FPR ranging from 5 to 20 percentage points. The magnitude of the increase depended upon the specific retention chemistries applied, the addition rate of those chemistries, and differences in process variables. ready lady chair
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WebFirst-pass retention (FPR) values are calculated from two consistency measurements: the headbox consistency and the white water consistency where cHB and cWW are the headbox and white water consistency, respectively. ABB KPM KC9 Optical Consistency Transmitters are designed for low consistency applications. WebTAPPI 200 om 89. The freeness degrees of SGW and KP, according to TAPPI 227 om 92, were determined as 58 oSR and 25 oSR, respectively. Anionic polyacrylamide with low charge density ... The first pass fines retention of sample was determined according to Equation 1: FPR= [1-[W ×(V/U)]/T] ×100 (1) Where T is the total fines amount in sample … WebJun 27, 2024 · For this purpose, 500 ml pulp suspension with certain consistency (0.5% (w/w)) was transferred to DDJ. Following the addition of chemicals, the filtrate was collected at 750 rpm agitation for 30 s. Finally, first pass retention was calculated according to TAPPI T261 cm-00. Transmission electron microscopy how to take althea pills