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Fiber-based characterization of pulp refining, TAPPI Journal September 2022

ABSTRACT: Fiber development in pulp refining can be characterized by three parameters: number of impacts on pulp, N; energy per impact, I, and bar force on fibers, F. These parameters enable comparisons of radically different refining conditions; determination of intensity for hardwoods and softwoods; assessment of effect of bar width on fiber shortening; and predictions of tensile strength increases.

Journal articles
Magazine articles
Open Access
Cellulosic ethanol byproducts as a bulking agent, TAPPI JOURNAL January 2017

Cellulosic ethanol byproducts as a bulking agent, TAPPI JOURNAL January 2017

Journal articles
Magazine articles
Standards
Open Access
On-machine visible dirt measurement on moving sheets and the relationships to standard laboratory methods, TAPPI Journal August 2020

ABSTRACT: There has been a proliferation of new sensors to measure on-machine dirt specks that employ different technologies and methodologies to perform measurements. The differences in the on-machine technologies are discussed in terms of the TAPPI and ISO standard laboratory test methods with respect to dirt detection using light reflected from, or light transmitted through, the sheet. Also discussed are the requirements for measuring sta-tistically representative areas of the sheet; the difference between the dirt physical size and Equivalent Black Area (EBA) size; and the implication of these issues when specifying cleanliness acceptance criteria.This technical brief describes on-machine visible dirt measurement’s relationship to standard laboratory testing.

Journal articles
Magazine articles
Standards
Open Access
Relating bending stiffness measurements across various free span lengths, TAPPI Journal August 2020

ABSTRACT: Bending stiffness should be an intrinsic property of a material, so it is puzzling that the TAPPI Standard Test Method T 836 “Bending stiffness, four point method” specifies span lengths when testing different types of corrugated fiberboard. These specified spans often limit the samples that can be measured with this method. To better understand the relationship between bending stiffness and span length, we performed measurements on a range of materials at different spans. The results provide a practical tool enabling comparison of bending stiffness measurements made at various span lengths. Additionally, this note discusses several areas that could serve as the foundation for more fundamental work exploring the bending behavior of corrugated board.

Journal articles
Magazine articles
Open Access
Magnetization of aminated lignin and characterization, TAPPI JOURNAL January 2019

Magnetization of aminated lignin and characterization, TAPPI JOURNAL January 2019

Journal articles
Magazine articles
Open Access
Editorial: TAPPI Journal reinstates the “Technical Brief” short-form research paper, TAPPI Journal June 2019

ABSTRACT: For many years, TAPPI Journal (TJ) accepted submissions of “Technical Briefs” (also known as Technical Notes or Brief Notes) in addition to the full-length papers peer-reviewed papers that you have typically seen in more recent years. The TJ Editorial Board is once again accepting these short-form papers, as readers may have noticed in the last issue with publication of Tom Lindstrom’s short nanocellulose re-view (TAPPI Journal 18[5]: 308[2019]). Another Technical Brief appears on p. 391 of the current issue.

Journal articles
Magazine articles
Open Access
Evaluating hardness and the S-test, TAPPI Journal March 2019

ABSTRACT: The corrugated industry typically quantifies crush resistance using the Concora corrugated medium test (CMT) on fluted medium or flat crush on combined board. These tests compress the materials until the point of complete failure of the flutes. Combined board elastically resists crushing forces until a certain point, the hardness of the structure, while additional load causes permanent damage and deformation. This study investigates how hardness can be measured directly from a load curve collected during CMT (or flat crush) testing and how it varies throughout the North American paper supply. It also explores how hardness corre-lates with the values obtained from the newly developed S-test. This new test method deserves further study as a potentially more appropriate specification for crush resistance of corrugated medium.

Journal articles
Magazine articles
Open Access
Controllable anisotropic properties of wet-laid hydroentangled nonwovens, TAPPI Journal March 2019

ABSTRACT: For nonwovens, fiber orientation distribution is an important structural characteristic that directly influences the anisotropic properties of the materials. Different Vslurry/Vbelt ratios were adopted to fabricate nonwovens during the wet-laid process. The results indicated that fiber orientation distribution of nonwovens can be regulated by adopting different Vslurry/Vbelt ratios owing to the web-forming principle of wet-laid techniques. Mechanical tests showed that both wet and dry tensile strength of nonwovens in different angle directions present anisotropy under different Vslurry/Vbelt ratio parameters. A liquid spreading distribution experiment proved that liquid spreading length and area of nonwovens could be manipulated using different Vslurry/Vbelt ratios in the fabrication process. Therefore, specific anisotropic properties of wet-laid hydroentangled nonwovens can be realized by controlling the process parameters for particular end-use applications.

Journal articles
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Open Access
Editorial: Concentrated content: TAPPI Journal special issues create research visibility, TAPPI Journal September 2024

You may have noticed that TAPPI Journal often brings readers special focused issues from time to time. Over the years, these issues have covered a range of topics, including wet-end technology, recovery cycle, foam forming, coating, additives, biorefinery, nanotechnology, lignin, pulping, recycling, university research, and more.

Journal articles
Magazine articles
Open Access
Pulping and bleaching of Malaysian oil palm empty fruit bunc

Pulping and bleaching of Malaysian oil palm empty fruit bunches, TAPPI JOURNAL June 2017

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