Calculate headbox consistency
WebThe consistency in the headbox is typically under 0.4% for most paper grades, with longer fibers requiring lower consistency than short fibers. Higher consistency causes more fibers to be oriented in the z direction, while lower consistency promotes fiber orientation in the x-y direction. Higher consistency promotes higher caliper (thickness ... WebPaper Machine Headbox Calculations The paper machine headbox is an equipment that supply very low consistency stock into the forming section uniformly. The formation and uniformity of the final paper product depends on the dispersion of the fiber and fillers. The furnish delivery system varies on the construction of the Read more.
Calculate headbox consistency
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WebHeadbox <1.0->1.0 It is the desire of every pulp maker to keep pulp at the highest possible consistency to minimize dilution water usage and which ends up as effluent. Higher consistency also helps in reducing the bleaching chemical consumption. But there are practical limitation of handling pulp at higher consistency such as high viscosity ... WebApr 15, 2015 · The Concept IV-MH headbox. The Concept IV-MH Headbox uses the same basic components as the Converflo headbox, but adds innovations that improve its ability to deliver a uniform cross-directional stock flow to the slice. In addition to the basic Converflo headbox components, the Concept IV-MH includes a parabolic inlet header, redesigned ...
WebWet end stability on any paper machine depends on minimizing the variability of conditions such as headbox and white water consistency, first-pass retention, and sheet ash content.Using a retention measurement and control system that incorporates sensors that can accurately measure both total consistency and ash consistency, can greatly … 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 …
WebCalculating the critical headbox consistency based on the furnish constituents and compare the results with the operating conditions. Calculating the ideal trailing sheet weights in Converflo type headboxes and compare the results with the existing condition for eliminating pulsation problems. Client Testimonials
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 very wide diversity of first-pass retention on different paper machines, from less than 50% to almost 100%. The key rules that papermakers follow are that (a) first-pass retention … chemical basis of plant leaf movementWebfurnish, particularly the fibers. Consistency is a measure of the percent solids in the stock slurry. The typical consistency at the headbox is around 0.5-1.0%. The turbulence … flight 2530WebFaculty Sites flight 2534WebDec 16, 2024 · The headbox jet velocity can be calculated from the following Bernoulli’s equation: V 2 = 2gh Where, ‘V’ is the jet velocity (m/s) ‘g’ is the acceleration constant, … flight 2533WebJun 14, 2024 · A reduction in softwood kraft fiber coarseness from 0.21 to 0.17 mg/m, associated with a reduction in fiber grammage from 6.2 to 5.2 g/m ² , was found to have no significant effect on formation at... flight 2533 southwestWebHeadbox, whitewater flotation deinking Clarifier, clear white water 1-5% Low Consistency 0.1-1.0% Very Low Consistency 0.01-0.1% Ultra Low ... • In theory it is possible to calculate consistency from the density difference between water and cellulose fibres. • … flight 2533 southwest airlinesWebFor special grades, one alternative is a rectifier roll headbox, which can be run either over or under-pressurized to obtain the correct slice flow. This also provides good formation, small basis weight variation and efficient pulsation dampening in … flight 2536