WebIdentify the most important factors affecting first-pass retention and the rate of drainage of water from the fiber mat during paper formation. Identify classes of wet-end chemical additives that can be used to achieve paper property objectives in various grades. 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).
Advances in Papermaking Wet End Chemistry Application …
WebJun 15, 2005 · At a dose level of 0.5% cationic polyacrylamide, the zeta potential of the pulp was −1.3 mV, near zero, yielding maximum increase in retention and maximum improvement in drainage. At this dose level, improvement in drainage was 82% and first pass retention increased from 81.8 to 87.5%. 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 data centers in north texas
(PDF) Mass Balance Equations for Retention and Basis
WebAll drivers who fail to update their medical history or pass the annual physical examination within the established time limits (See Regulation 4140, Physical and Medical … 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 … Webfirst-pass retention evaluations.The control with no aid is an average of three tests.Figure 2shows the lab-oratory drainage rate results as per-centage improvement over no treat … bitlocker replace motherboard