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Time to Learn About Data-Driven Decision Making with Process Analytics
Register today for the "Data-Driven Decision Making with Process Analytics - Making sense of big data in the pulp and paper industry" webinar held Thursday, October 27th 11:00 AM – 12:00 PM (ET).
Effect of fly ash-based calcium silicate on physical properties of cardboard paper, TAPPI Journal July 2023
ABSTRACT: This work reported the possibility of using fly ash-based calcium silicate (FACS) as filler for papermaking and waste fiber to synthesize cardboard paper. The adverse effects of FACS filler on paper strength were improved by using cationic starch modification, surface size, and interlayer-filled technology. Physical property tests indicated that the increase of filler content leads to a decrease in paper strength and an increase in bulk, but at the same content, the strength properties of paper modified by cationic starch were significantly improved, and the absorption resistance was lower. The paper had better absorption resistance than the original FACS paper after surface size. In addition, the absorption resistance and strength of the interlayer filling paper were better than the original FACS-filled paper, and the absorption resistance was the best. The results support the potential use of FACS as a low-cost filler for cardboard paper production.
Web instability in the open draw and the impact on paper machine efficiency, TAPPI Journal May 2022
ABSTRACT: Paper is most likely to break in the first open draw on a paper machine where it is unsupported, wettest, and weakest. Tension is applied to peel the web from the roll surface, as well as minimize web flutter in the open draw. The average tension is well below the breaking point and is often set by adjusting the speed difference between the press and the next machine element by visually observing the behavior of the web. However, machine direction variations caused by instabilities in the paper machine can cause tension swings that exceed the strength of the web. Measurement of the web’s release point from press rolls on pilot and commercial paper machines was used to identify the cause of tension instabilities. Variations in the speed of the paper machine drives and the work of adhesion from the press roll surface were identified as key factors. Fluctuations of paper moisture, which affects the elastic modulus and strength of the web, appear to be less important.
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Experiments and visualization of sprays from beer can and turbo liquor nozzles, TAPPI Journal February 2022
ABSTRACT: Industrial scale swirl-type black liquor nozzles were studied using water as the test fluid. Simple water spraying experiments were found to be very beneficial for studying and comparing nozzles for black liquor spraying. These kinds of experiments are important for finding better nozzle designs. Three nozzle designs were investigated to understand the functional differences between these nozzles. The pressure loss of nozzle 1 (“tangential swirl”) and nozzle 3 (“turbo”) were 97% and 38% higher compared to nozzle 2 (“tan-gential swirl”). Spray opening angles were 75°, 60°, and 35° for nozzles 1, 2, and 3, respectively. Video imaging showed that the nozzles produced sprays that were inclined a few degrees from the nozzle centerline. Spray patter-nation showed all the sprays to be asymmetric, while nozzle 2 was the most symmetric. Laser-Doppler measure-ments showed large differences in spray velocities between nozzles. The spray velocity for nozzle 1 increased from 9 m/s to 15 m/s when the flow rate was increased from 1.5 L/s to 2.5 L/s. The resulting velocity increase for nozzle 2 was from 7 m/s to 11 m/s, and for nozzle 3, it was from 8 m/s to 13 m/s. Tangential flow (swirl) directed the spray 6°–12° away from the vertical plane. Liquid sheet breakup mechanisms and lengths were estimated by analyzing high speed video images. The liquid sheet breakup mechanism for nozzle 1 was estimated to be wave formation, and the sheet length was estimated to be about 10 cm. Sheet breakup mechanisms for nozzle 2 were wave formation and sheet perforation, and the sheet length was about 20 cm. Nozzle 3 was not supposed to form a liquid sheet. Nozzle geometry was found to greatly affect spray characteristics.
Measurement of Microstickies, 2008 Engineering, Pulping and Environmental Conference
Measurement of Microstickies, 2008 Engineering, Pulping and Environmental Conference
Technical Review: Laboratory Testing and Boiler Trials Fail to Produce Evidence that Studs Mitigate Corrosion of Recovery Boiler Tubes, 2008 Engineering, Pulping and Environmental Conference
Technical Review: Laboratory Testing and Boiler Trials Fail to Produce Evidence that Studs Mitigate Corrosion of Recovery Boiler Tubes, 2008 Engineering, Pulping and Environmental Conference
Value Destruction, Creation and Capture, 2008 Engineering, Pulping and Environmental Conference
Value Destruction, Creation and Capture, 2008 Engineering, Pulping and Environmental Conference
Effects of Extractives from Mountain Pine Beetle-Attacked Lodgepole Pine on Kraft Mills, 2008 Engineering, Pulping and Environmental Conference
Effects of Extractives from Mountain Pine Beetle-Attacked Lodgepole Pine on Kraft Mills, 2008 Engineering, Pulping and Environmental Conference
SHORT-TIME COATING DEWATERING: A NOVEL TEST METHOD AND MODEL, 2008 Advanced Coating Fundamentals Symposium
SHORT-TIME COATING DEWATERING: A NOVEL TEST METHOD AND MODEL, 2008 Advanced Coating Fundamentals Symposium
Latex Dispersions as Carriers for Glucose Oxidase Oxygen Scavenging Systems, 2008 Advanced Coating Fundamentals Symposium
Latex Dispersions as Carriers for Glucose Oxidase Oxygen Scavenging Systems, 2008 Advanced Coating Fundamentals Symposium