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Journal articles
Open Access
Changes with aging in the surface hydrophobicity of coated paper, TAPPI JOURNAL May 2010

Changes with aging in the surface hydrophobicity of coated paper, TAPPI JOURNAL May 2010

Journal articles
Open Access
Converted bleach sequence improves pulp quality, TAPPI JOURNAL, July 1990, Vol. 73(7)

Converted bleach sequence improves pulp quality, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
A new wet-end control system with on-line sensors, TAPPI JOURNAL, July 1990, Vol. 73(7)

A new wet-end control system with on-line sensors, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
Pulping of southern pine under low water, alkaline conditions using supercritical carbon dioxide-sulfur dioxide mixtures, TAPPI JOURNAL, July 1990, Vol. 73(7)

Pulping of southern pine under low water, alkaline conditions using supercritical carbon dioxide-sulfur dioxide mixtures, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
Hydrogen-peroxide-reinforced oxygen delignification of southern pine kraft pulp and short sequence bleaching, TAPPI JOURNAL, July 1990, Vol. 73(7)

Hydrogen-peroxide-reinforced oxygen delignification of southern pine kraft pulp and short sequence bleaching, TAPPI JOURNAL, July 1990, Vol. 73(7)

Magazine articles
Open Access
Pump bearings: a new bearing system to improve reliability, TAPPI JOURNAL, March 1990, Vol. 73(3)

Pump bearings: a new bearing system to improve reliability, TAPPI JOURNAL, March 1990, Vol. 73(3)

Magazine articles
Open Access
Steam cycle passivation and corrosion protection, TAPPI JOURNAL, March 1990, Vol. 73(3)

Steam cycle passivation and corrosion protection, TAPPI JOURNAL, March 1990, Vol. 73(3)

Journal articles
Magazine articles
Open Access
Using novel DNA methods to achieve higher process efficiency and performance, TAPPI Journal January 2023

ABSTRACT: Uncontrolled microbiological activity is a challenge for recycled fiber (RCF) mills as it can have negative effects on production and end-product quality. The microbes that exist in these systems have been largely unknown, and the strategies employed to control microbiology have been non-specific. Understanding the specific microbial groups present in RCF mills, their properties, and where they exist, as well as having the ability to accurately measure the true troublemakers, are key to targeted control of the bad actors. In this study, we present the results of a global survey of over 40 RCF paper machines. The same RCF-specific problem-causing bacterial groups were found on different continents, including large densities of newly identified bacteria in paper processes. Those can degrade cellulose and starch, produce acids and odorous substances, and have a significant impact on fiber strength and additive consumption. We also demonstrate how modern DNA tools can quantify the impact of biocidal countermeasures against the actual troublemakers, including bacteria found to degrade cellulose during RCF pulp storage, which may be linked to a negative impact on end-product strength. These novel DNA tools give producers updated biocide program key performance indicators (KPIs) and actionable information to more effectively design and adjust microbiological control to achieve higher process efficiency and performance.

Journal articles
Magazine articles
Open Access
Advanced real-time digital microscopy of foaming processes, TAPPI Journal January 2023

ABSTRACT: The properties of aqueous foams play a major role in foam forming and foam coating. Inline real-time foam measurements provide highly desired opportunities for optimization and control of foaming processes. This paper presents inline digital microscopy measurements of aqueous foams in foaming processes. It presents methods for providing detailed information on foam quality parameters, such as foam density and foam homogeneity in real time from the process. In addition, this study evaluates the performance of transillumination and front-light illumination in imaging of foams. The tests show very good results for the transillumination approach. Limitations of the image-based optical technique are discussed, and the precision of bubble size distribution measurement is assessed with a certificated reference substance. The measured foam densities are compared against the reference foam densities in the range 100•300 g/L, providing a linear correlation with R2 value of 0.99. In the case of heterogenous foams with a wide bubble size distribution, the bubble size-dependent dimensionless depth of field must be taken into account to obtain accurate estimates of foam density. Bubble-scale foam homogeneity is described by the standard deviation of bubble size distribution in foam.

Journal articles
Magazine articles
Open Access
Chemical addition to wet webs using foam application, TAPPI Journal January 2023

ABSTRACT: In papermaking, the conventional way to add chemicals to the web is to dose them into the fiber stock and form the paper afterwards. However, in many cases, adding chemicals directly to the stock is challenging. For example, strength aids tend to increase flocculation in the stock, which limits the addition amounts of those aids. The need for better performance of paper (and paperboard) products has given rise to the need for functionalization of paper. Adding such functional chemicals to the stock is usually rather inefficient. Hence, novel methods are needed to add chemicals to the paper bulk. One such method is dosing chemicals to the wet web via foam application. In this study, we built a laboratory-scale sheetfed dynamic foam application device and utilized it to study addition of starch to wet bleached chemithermomechanical pulp (BCTMP) paper handsheets. The impact of parameters such as vacuum level, the amount of added chemical, and the viscosity of the foaming liquid on the penetration of starch into the wet web was explored. Starch penetration into wet webs was measured via iodine-potassium iodide staining, followed by image analysis. According to our results, controlling the viscosity of the foaming liquid gives the best possibility to control the penetration.

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