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Journal articles
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Open Access
Case study: Paper mill power plant optimization—balancing steam venting with mill demand, TAPPI Journal June 2020

ABSTRACT: Most Power departments are tasked with generating steam to support mill wide operations, generate electricity, and reduce operating costs. To accomplish these tasks, power boilers generate high pressure steam that is reduced to intermediate and low pressures for process utilization in the mill by means of steam turbine generator extraction or pressure reducing valves. The most economical method to reduce steam pressure is the use of steam turbine generators, as electricity is generated from the steam when it is reduced in pressure. Electricity that is produced by these generators provides a substantial financial benefit and helps offset overall operational costs. To achieve tangible financial gains, the mill must evaluate the overall cost of steam production and the price of electricity.The current work provides a case study of power plant optimization that evaluated electricity production and steam production costs balanced with mill steam demand. Process and cost optimization led to a significant reduc-tion in low pressure steam venting, resulting in reduced fuel consumption and reduced operating cost.

Journal articles
Magazine articles
Open Access
Multifunctional barrier coating systems created by multilayer curtain coating, TAPPI Journal November 2023

ABSTRACT: Functional coatings are applied to paper and paperboard substrates to provide resistance, or a barrier, against media such as oil and grease, water, water vapor, and oxygen, for applications such as food packaging, food service, and other non-food packaging. Today, there is increasing interest in developing recyclable and more sustainable approaches for producing these types of packages. This paper focuses on water-based barrier coatings (WBBC) for oil and grease resistance (OGR), water, moisture vapor transmission rate (MVTR), and oxygen barrier performance. The main goal is to create coated systems that can achieve more than one barrier property using multilayer curtain coating (MLCC) in a single application step. One advantage is in optimizing coating material cost with the use of functional chemistry in confined layers where performance is balanced within the coating layered structure. This allows simultaneous application of layers of different polymer types in one step to achieve the appropriate performance needs for a given barrier application. This paper provides working examples of using MLCC to create coating structures with multiple barrier properties in a single application pass. Barrier polymers studied include styrene butadiene, styrene acrylate, starch-containing emulsions, and polyvinyl alcohol. The paper also shows the effect of increasing the pigment volume concentration with platy clay or fine ground calcium carbonate on MVTR and OGR barrier properties.

Journal articles
Magazine articles
Open Access
Surface energy considerations for offset printing of coated paper and paperboard, TAPPI Journal November 2023

ABSTRACT: Offset printing of coated paper involves the complex interactions of ink with a surface that is characterized by three major properties: roughness, porosity, and related pore network structure and surface chemistry (related to surface free energy [SFE]). The effects of porosity and roughness are relatively well understood and are documented in the literature, whereas the influence of surface chemistry is much less studied and therefore the focus of this paper. The key results shown include: i) Coating porosity has a negligible effect on SFE determination by contact angle using two fluids. ii) The chemistry of the latex polymer in the coating formulation dominates the influence on SFE compared to pigment, with any surface energy differences present in the pigment being almost completely masked by latex. iii) Wetting agent and corona treatment can impact water absorption rate and surface spreading of water, resulting in small differences in printability. Increasing the concentration of the surfactant on a coated surface indicates switching orientation of the surfactant molecules, giving a “step wise” printing result. When looking to improve offset printability by selection of different pigments, the variation in SFE is less important than variation in either surface roughness or porosity.

Journal articles
Open Access
Comparing papermaking wet-end charge-measuring techniques in kraft and groundwood systems, TAPPI JOURNAL, November 1995, Vol. 78(11)

Comparing papermaking wet-end charge-measuring techniques in kraft and groundwood systems, TAPPI JOURNAL, November 1995, Vol. 78(11)

Journal articles
Open Access
Separation of fiber and ash in deinking effluents: a case study, TAPPI JOURNAL, May 1995, Vol. 78(5)

Separation of fiber and ash in deinking effluents: a case study, TAPPI JOURNAL, May 1995, Vol. 78(5)

Magazine articles
Open Access
'Advancing through cooperation' in printing and graphic arts, TAPPI JOURNAL, May 1995, Vol. 78(5)

'Advancing through cooperation' in printing and graphic arts, TAPPI JOURNAL, May 1995, Vol. 78(5)

Magazine articles
Open Access
Promoting safety in the workplace, TAPPI JOURNAL, November 1995, Vol. 78(11)

Promoting safety in the workplace, TAPPI JOURNAL, November 1995, Vol. 78(11)

Magazine articles
Open Access
Yankee dryer crevice corrosion evaluation, TAPPI JOURNAL, November 1995, Vol. 78(11)

Yankee dryer crevice corrosion evaluation, TAPPI JOURNAL, November 1995, Vol. 78(11)

Journal articles
Open Access
A new headbox design featuring consistency profiling decoupled from fiber orientation response, TAPPI JOURNAL, November 1995, Vol. 78(11)

A new headbox design featuring consistency profiling decoupled from fiber orientation response, TAPPI JOURNAL, November 1995, Vol. 78(11)

Magazine articles
Open Access
Thermal spray coatings reduce wear and corrosion on calender rolls, TAPPI JOURNAL, October 1995, Vol. 78(10)

Thermal spray coatings reduce wear and corrosion on calender rolls, TAPPI JOURNAL, October 1995, Vol. 78(10)

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