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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
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
Magazine articles
Open Access
Editorial: Looking back and looking forward: Paper physics and the paper industry, TAPPI Journal October 2018

Editorial: Looking back and looking forward: Paper physics and the paper industry, TAPPI Journal October 2018

Journal articles
Magazine articles
Open Access
Editorial: Remembering Phil Clark: A Coating “Master Man”, TAPPI JOURNAL July 2018

Editorial: Remembering Phil Clark: A Coating “Master Man”, TAPPI JOURNAL July 2018

Journal articles
Magazine articles
Open Access
Effect of pH and enzymes on strength of recycled fibers during refining, TAPPI JOURNAL July 2018

Effect of pH and enzymes on strength of recycled fibers during refining, TAPPI JOURNAL July 2018

Journal articles
Magazine articles
Open Access
Editorial: TAPPI Journal 2017 Best Research Paper Award recognizes recycling technology, TAPPI JOURNAL June 2018

Editorial: TAPPI Journal 2017 Best Research Paper Award recognizes recycling technology, TAPPI JOURNAL June 2018

Journal articles
Magazine articles
Open Access
Controlling porosity and density of nanocellulose aerogels for superhydrophobic light materials, TAPPI JOURNAL March 2018

Controlling porosity and density of nanocellulose aerogels for superhydrophobic light materials, TAPPI JOURNAL March 2018

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.

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