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Journal articles
Open Access
The influence of paper surface energy on multicolor offset print mottling, TAPPI JOURNAL February 2013

The influence of paper surface energy on multicolor offset print mottling, TAPPI JOURNAL February 2013

Journal articles
Open Access
Margins-based planning applied to newsprint manufacturing, TAPPI JOURNAL January 2014

Margins-based planning applied to newsprint manufacturing, TAPPI JOURNAL January 2014

Journal articles
Open Access
Thin coatings for paper by foam coating, TAPPI JOURNAL July 2014

Thin coatings for paper by foam coating, TAPPI JOURNAL July 2014

Journal articles
Open Access
Nonwood fibers offer potential opportunity for papermakers

Guest Editorial: Nonwood fibers offer potential opportunity for papermakers, TAPPI JOURNAL June 2014

Journal articles
Open Access
Guest Editorial: TAPPIâ??s 2013 PEERS Conference: Pulp manufacturing highlights, TAPPI JOURNAL March 2014

Guest Editorial: TAPPI’s 2013 PEERS Conference: Pulp manufacturing highlights, TAPPI JOURNAL March 2014

Journal articles
Open Access
Qualification of Welding Procedures for Duplex Stainless Ste

Qualification of Welding Procedures for Duplex Stainless Steels, 1999 Engineering Conference Proceedings

Journal articles
Open Access
Steambox Comparator Experiments: Apparatus Validation and In

Steambox Comparator Experiments: Apparatus Validation and Investigation of Steambox Performance, 1999 Engineering Conference Proceedings

Journal articles
Open Access
Application of Spherical Hollow Calcium Carbonate Particles

Application of Spherical Hollow Calcium Carbonate Particles as Filler and Coating Pigment, 2002 Coating Conference Proceedings

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.

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