First pass retention tappi
WebRetention definitions Define the meanings of the retention terms commonly used in the papermaking process: overall, true, and first-pass retention. Available for Subscriptions Add to Alert PDF Content Provider Technical … WebVariations due to retention efficiency can be minimized by such practices as aiming for a higher level of first-pass retention (reducing the fines content of the white water), online control of white-water solids, and online control of cationic demand. ... Hubbe, M. A., “Retention and Hydrodynamic Shear,” Tappi J. 69 (8): 116 (1986).
First pass retention tappi
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WebFirst-pass retention was measured in terms of TAPPI T261 cm-10 (2010). The white ledger stock was diluted to 0.5% using tap water. Next, the C-PAMs were diluted to a concentration of 0.1% with distilled water. ... (TAPPI T244 cm-99 1999) of the handsheets were measured. PEER-REVIEWED ARTICLE bioresources.com 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.
Webreliably predict first-pass retention in all pulp systems. As a starch manufacturer, our company is interested in optimizing wet-end. starch retention, since this would allow papermakers to use cheaper fibers and more filler. Our research on wet-end chemistry (6) has led us to formulate a few basic rules for optimizing first-pass retention WebAlmost any retention aid is apt to improve the drainage rate as fines and fillers are removed from the white water, which decreases the solids content of the white water; …
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%. WebChapter 7 - Control and optimization of retention 7-1 Retention of fine particles during paper forming 7-1-1 Whitewater 7-1-2 Calculating first pass retention 7-2 Factors impacting retention 7-3 Brief Overview of retention chemicals and their effects 7-3-1 Charge neutralization 7-3-2 Patching 7-3-3 Bridging 7-3-4 Complex and network flocculation
WebOct 1, 2024 · First pass retention is of ext reme importance to the papermaker because it influences paper machine runnability, material loss levels, an d chemical use effici encies.
WebMar 1, 2007 · first-pass retention, sizing, and other produc-tion goals. (24-25) ... for the feed water of retention aids,” Proc. Tappi. Papermakers Conf., T APPI Press, Atlanta, 2, 775-784 (2002). birds of paradise streamWeb3) VBA appraises all records and publishes their approved retention periods in the appropriate RCS VB-1, PART I & PART II. 4) VBA places the Records Program Office at … danbury ct garden clubWebAll 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 … danbury ct furniture storehttp://www.papergrease.com/glossary/first-pass-retention/ danbury ct dmv permit testWebfirst-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 … danbury ct fingerprintingWebJun 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 birds of paradise tattooWebAug 2, 2013 · First-pass retention gives a practical indication of the efficiency by which fine materials are retained in a web of paper as it is being formed. First-pass retention … danbury ct fire department