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Journal articles
Open Access
Modeling coating structure development using a monte carlo deposition method part 2: validation of the model and case study, TAPPI JOURNAL, May 2003, Vol. 2(5) (262KB)

Modeling coating structure development using a monte carlo deposition method part 2: validation of the model and case study, TAPPI JOURNAL, May 2003, Vol. 2(5) (262KB)

Journal articles
Open Access
Fiber surface saturation as a strategy to optimize dual-poly

Fiber surface saturation as a strategy to optimize dual-polymer dry strength treatment, Solutions! & TAPPI JOURNAL, November 2003, Vol. 2(11) (156KB)

Journal articles
Open Access
Ring crush and short span compression for predicting edgewis

Ring crush and short span compression for predicting edgewise compressive strength, Solutions! & TAPPI JOURNAL, November 2003, Vol. 2(11) (113KB)

Journal articles
Open Access
A review of gas flows in fiber suspensions, TAPPI JOURNAL, Online Exclusive, November 2003, Vol. 2(11) (775KB)

A review of gas flows in fiber suspensions, TAPPI JOURNAL, Online Exclusive, November 2003, Vol. 2(11) (775KB)

Journal articles
Open Access
A new retention aid for the production of SC printing grades: pilot paper machine results, TAPPI JOURNAL, September 2003, Vol. 2(9) (255KB)

A new retention aid for the production of SC printing grades: pilot paper machine results, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (255KB)

Journal articles
Open Access
Potential of mimosa (albizia julibrissin ) for papermaking, TAPPI JOURNAL, September 2003, Vol. 2(9) (150KB)

Potential of mimosa (albizia julibrissin ) for papermaking, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (150KB)

Journal articles
Magazine articles
Open Access
The evolution of reel statistical methods, TAPPI Journal June 2019

ABSTRACT: Multiple statistical methods for calculating the variance partition analysis (VPA) of reel data have existed for decades. In the paper industry, VPA is also commonly known as reel statistics. VPA commonly consists of total variance (TOT) that is then divided into three components: cross direction (CD), machine direction (MD), and residual (RES). A common mathematical procedure is referred to as ANOVA (analysis of variance). TAPPI Standard Test Method T 545 “Cross-machine grammage profile measurement (gravimetric method)” addresses paper testing and includes the ANOVA equations that have also been used to analyze scanning data.In the 1990s, TAPPI published TIP 1101-01 “Calculation and partitioning of variance using paper machine scanning sensor measurements,” which contained simple formulas that were easy to implement and could be used by a nov-ice to generate statistics on a spreadsheet. All involved quality control system (QCS) suppliers agreed to support this common method in their QCS. TIP 1101 was recently revised, and this paper concerns the analysis of data collected from a scanning sensor in a QCS and the creation of a common method for the calculation of reel statistics by TAPPI’s Process Control Division.

Journal articles
Magazine articles
Open Access
Lignin-based resins for kraft paper applications, TAPPI Journal November 2019

ABSTRACT: We investigated miscanthus (MS) and willow (W) lignin-furfural based resins as potential reinforce-ment agents on softwood and hardwood kraft paper. These resins might be sustainable alternatives to the commercial phenolformaldehyde (PF) resins. Phenol is a petrochemical product and formaldehyde has been classified as a carcinogen by the U.S. Environmental Protection Agency. The lignin used in this study was derived from hot water extraction (160ºC, 2 h) of MS and W biomass, and may be considered sulfur-free. These biorefinery lignins were characterized for their chemical composition and inherent properties via wet chemistry and instrumental techniques. The resin blends (MS-resin and W-resin) were characterized for their molecular weight, thermal behavior, and mechanical properties. Mechanical properties were measured by the resin’s ability to reinforce softwood and hard-wood kraft papers. The effect of adding hexamethylenetetramine (HMTA), a curing agent, to the resin was also examined. Mixtures of PF and lignin-based resins were investigated to further explore ways to reduce use of non-renewables, phenol, and carcinogenic formaldehyde. The results show that lignin-based resins have the potential to replace PF resins in kraft paper applications. For softwood paper, the highest strength was achieved using W-resin, without HMTA (2.5 times greater than PF with HMTA). For hardwood paper, MS-resin with HMTA gave the highest strength (2.3 times higher than PF with HMTA). The lignin-based resins, without HMTA, also yielded mechanical properties comparable to PF with HMTA.

Journal articles
Open Access
Corrosion of Carbon Steel Tubes in the Mid-Furnance of Kraft Recovery Boilers--Environmental Characterization, TAPPI JOURNAL April 2009

Corrosion of Carbon Steel Tubes in the Mid-Furnance of Kraft Recovery Boilers--Environmental Characterization, TAPPI JOURNAL April 2009

Journal articles
Magazine articles
Open Access
Rheological characteristics of platy kaolin, TAPPI JOURNAL September 2019

ABSTRACT: Platy kaolin can provide significant value in the coating of paper and paperboard. It can be used in multiple applications and can provide benefits such as titanium dioxide (TiO2) extension, smoothness improvement, improved print gloss or ink set rates, calendering intensity reduction, and improved barrier properties. It is not a pigment that can be simply substituted for traditional hydrous kaolin without some adjustment to the coating formulation. These adjustments can be as simple as reducing solids, but may require binder changes as well. The coater setup may need to be adjusted because of the unique rheological behaviors these pigments exhibit.The unique rheological characteristics of platy kaolin are explored here. Measurements of the water retention of platy kaolin containing coatings confirm that water retention is not reduced in comparison to more blocky kaolin pigments, despite the lower coating solids at which they need to be run. This means that the rheological characteristics are the most important in understanding the runnability. An extensive analysis reveals some unique behaviors that need to be understood when utilizing these materials. Viscoelastic measurements indicate that, for this binder system, Tan d is mainly a function of solids. This may explain how weeping is initiated on a blade coater. The degree of shear thinning behaviors is investigated using the Ostwald de-Waele power law. The immobilization point was determined using the Dougherty-Krieger equation and related to the work of Weeks at the University of Maine on blade coater runnability. An indirect measure of particle shape and size synergy is also demonstrated using the Dougherty-Krieger equation parameters.

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