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Journal articles
Open Access
Working in eastern europe: an engineer's experience paper industry, TAPPI JOURNAL, February 1999, Vol. 82(2)

Working in eastern europe: an engineer's experience paper industry, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Shop talk: dryer grinding in mills producing packaging and graphics paper, TAPPI JOURNAL, February 1999, Vol. 82(2)

Shop talk: dryer grinding in mills producing packaging and graphics paper, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Growing the forest in south africa, TAPPI JOURNAL, July 1999, Vol. 82(7)

Growing the forest in south africa, TAPPI JOURNAL, July 1999, Vol. 82(7)

Journal articles
Open Access
Modeling suction shoes in twin-wire blade forming: theory, TAPPI JOURNAL, September 1999, Vol. 82(9)

Modeling suction shoes in twin-wire blade forming: theory, TAPPI JOURNAL, September 1999, Vol. 82(9)

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
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)

Journal articles
Open Access
Tenacit , fracture mechanics, and unknown coater web breaks, TAPPI JOURNAL, February 1996, Vol. 79(2)

Tenacit , fracture mechanics, and unknown coater web breaks, TAPPI JOURNAL, February 1996, Vol. 79(2)

Journal articles
Magazine articles
Open Access
Measurement and control of extensional viscosity in barrier coating dispersions, TAPPI Journal November 2023

ABSTRACT: This study aimed to understand the effect of various rheological additives on the extensional viscosity of barrier coating dispersions, as well as to understand the role extensional viscosity plays in stabilizing a liquid curtain. The apparent extensional viscosity was measured using two devices that create accelerating flows: a capillary viscometer and an orifice rheometer. Additives tested include several polyvinyl alcohols, a high molecular weight polyethylene oxide, and carboxymethylcellulose. Extensional viscosity plays a significant role in stabilizing a liquid curtain, as it slows down hole expansion and prevents impurities and disturbances from causing holes in the first place. Some of the additives could substantially increase the extensional viscosity of the dispersions without increasing the shear viscosity outside the typical range of processability for a curtain coater. Some of the additives exhibited coil-stretch transition, meaning they start increasing extensional viscosity above a certain extension rate. Polymers with low chain lengths exhibited finite extensibility, which indicates the polymer chain has fully extended and cannot provide further extensional viscosity, even though the extending force is increased. Polymeric additives with stiff or branched chains significantly raised shear viscosity without increasing extensional viscosity. Both methods could reliably measure extensional viscosity in curtain coating barrier dispersions.

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
Open Access
On the effect of centrifugal force on winding, TAPPI JOURNAL, July 1995, Vol. 78(7)

On the effect of centrifugal force on winding, TAPPI JOURNAL, July 1995, Vol. 78(7)

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