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Journal articles
Open Access
Improving TMP pulp properites by sulfonation: optimization of sulfonation process alternatives, TAPPI JOURNAL October 1988 88OCT123

Improving TMP pulp properites by sulfonation: optimization of sulfonation process alternatives, TAPPI JOURNAL October 1988

Journal articles
Open Access
89JUN151

Modeling the chlorination stage in a pulp bleach plant, TAPPI JOURNAL June 1989

Journal articles
Open Access
89JUN157

Effects of oxygen extraction on organic chlorine contents in bleach plant effluents, TAPPI JOURNAL June 1989

Journal articles
Open Access
Dimensional stability of mechanical pulps - drying shrinkage and hygroexpansivity, TAPPI JOURNAL, June 1993, Vol. 76(6)

Dimensional stability of mechanical pulps - drying shrinkage and hygroexpansivity, TAPPI JOURNAL, June 1993, Vol. 76(6)

Journal articles
Open Access
Thermal analysis of recovery boiler deposits, TAPPI JOURNAL, June 1993, Vol. 76(6)

Thermal analysis of recovery boiler deposits, TAPPI JOURNAL, June 1993, Vol. 76(6)

Journal articles
Open Access
Formation of chlorinated dioxins during production of bleached kraft pulp from sawmill chips contaminated with polychlorinated phenols, TAPPI JOURNAL, March 1993, Vol. 76(3)

Formation of chlorinated dioxins during production of bleached kraft pulp from sawmill chips contaminated with polychlorinated phenols, TAPPI JOURNAL, March 1993, Vol. 76(3)

Journal articles
Open Access
Reductive degradation of residual chromophores in kraft pulp with sodium dithionite, TAPPI JOURNAL March 2012

Reductive degradation of residual chromophores in kraft pulp with sodium dithionite, TAPPI JOURNAL March 2012

Journal articles
Open Access
Two-sided drainage handsheet machine, TAPPI JOURNAL May 2012

Two-sided drainage handsheet machine, TAPPI JOURNAL May 2012

Journal articles
Magazine articles
Open Access
Combatting lime kiln ringing problems at the Arauco Constitución mill, TAPPI Journal July 2020

ABSTRACT: The lime kiln at the Arauco Constitución mill experienced severe ringing problems requiring it to be shut down for ring removal every 3 to 6 months. The mill controlled the problems by blasting ring deposits off during operation with its existing industrial shotgun and a newly installed Cardox liquid carbon dioxide (CO2) cartridge system. Various ring blasting procedures were tested to determine the optimum ring location and thickness to blast; the optimum depth to insert the CO2 cartridge into the kiln; and the most effective blasting frequency and sequence to employ. The best strategy was found to be the weekly blasting operation that alternated between the liquid CO2 cartridge and the industrial shotgun, with the CO2 cartridge inserted into the ring mass, 20 cm (8 in.) away from the refractory brick surface, and the shotgun aimed at rings at about 28 m (92 ft) from the kiln discharge end. With each blasting event removing considerably more rings than before, it takes a longer time for rings to rebuild, allowing the kiln to run continuously between annual maintenance shutdowns with only a few short (< 4 h) downtimes for ring removal. This substantially reduces the costs associated with ring removal and lime replacement during unscheduled shutdowns.

Journal articles
Magazine articles
Open Access
Viscoelastic web curl due to storage in wound rolls, TAPPI Journal July 2020

ABSTRACT: Winding is often the final operation in a roll-to-roll manufacturing process. Web materials, i.e., materials that are thin compared to their length, are wound into rolls because this form is the only practical means to store them. The resulting bending strains and associated stresses are large for thick webs and laminates. As many webs are viscoelastic on some time scale, bending stresses lead to creep and inhomogeneous changes in length. When the web material is unwound and cut into discrete samples, a residual curvature remains. This curvature, called curl, is the inability for the web to lie flat at no tension. Curl is an undesirable web defect that causes loss of productivity in a subsequent web process. This paper describes the development and implementation of modeling and experimental tools to explore and mitigate curl in homogenous webs. Two theoretical and numerical methods that allow the prediction of curl in a web are developed: a winding software based on bending recovery theory, and the implementation of dynamic simula-tions of winding. One experimental method is developed that directly measures the curl online by taking advantage of the anticlastic bending resulting from the curl. These methods are demonstrated for a low-density polyethylene web.

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