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Journal articles
Open Access
89AUG67

Advancing air pollution control technologies for burning coal, TAPPI JOURNAL August 1989

Journal articles
Open Access
89APR177

MD microstriations in paper: a two-sided shrinkage phenomenon?, TAPPI JOURNAL April 1989

Journal articles
Open Access
89APR59

Alkaline papermaking experience at Simpson Plainwell Paper Co., TAPPI JOURNAL April 1989

Journal articles
Open Access
89APR81

Predicting the potential print quality of newsprint, TAPPI JOURNAL April 1989

Journal articles
Open Access
89APR87

High-humidity hoods conserve energy and improve runnability, TAPPI JOURNAL April 1989

Journal articles
Open Access
89APR91

How do TAPPI members feel about their Associations?, TAPPI JOURNAL April 1989

Journal articles
Open Access
Binder selection for glass, polyester, and blended wet-lay nonwovens, TAPPI JOURNAL April 1989

Binder selection for glass, polyester, and blended wet-lay nonwovens, TAPPI JOURNAL April 1989

Journal articles
Open Access
Statistical process control based on function analysis, TAPPI JOURNAL April 1989

Statistical process control based on function analysis, TAPPI JOURNAL April 1989

Journal articles
Magazine articles
Open Access
Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer, TAPPI Journal November 2019

ABSTRACT: The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compo-sitions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

Journal articles
Magazine articles
Open Access
A novel predictive method for filler coflocculation with cellulose microfibrils, TAPPI Journal November 2019

ABSTRACT: Different strategies aimed at reducing the negative impact of fillers on paper strength have been the objective of many studies during the past few decades. Some new strategies have even been patented or commercialized, yet a complete study on the behavior of the filler flocs and their effect on retention, drainage, and formation has not been found in literature. This type of research on fillers is often limited by difficulties in simulating high levels of shear at laboratory scale similar to those at mill scale. To address this challenge, a combination of techniques was used to compare preflocculation (i.e., filler is flocculated before addition to the pulp) with coflocculation strategies (i.e., filler is mixed with a binder and flocculated before addition to the pulp). The effect on filler and fiber flocs size was studied in a pilot flow loop using focal beam reflectance measurement (FBRM) and image analysis. Flocs obtained with cationic polyacrylamide (CPAM) and benonite were shown to have similar shear resistance with both strategies, whereas cationic starch (CS) was clearly more advantageous when coflocculation strategy was used. The effect of flocculation strategy on drainage rate, STFI formation, ash retention, and standard strength properties was measured. Coflocculation of filler with CPAM plus bentonite or CS showed promising results and produced sheets with high strength but had a negative impact on wire dewatering, opening a door for further optimization.

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