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Journal articles
Open Access
An overview of ferrography and its use in maintenance, TAPPI JOURNAL, August 1991, Vol. 74(8)

An overview of ferrography and its use in maintenance, TAPPI JOURNAL, August 1991, Vol. 74(8)

Journal articles
Open Access
Alternative methods for bleaching post consumer waste papers, TAPPI JOURNAL, August 1991, Vol. 74(8)

Alternative methods for bleaching post consumer waste papers, TAPPI JOURNAL, August 1991, Vol. 74(8)

Journal articles
Open Access
Bleaching of nonwood pulps: can sodium hydroxide be replaced with sodium carbonate in the alkaline extraction of nonwood pulps?, TAPPI JOURNAL, August 1991, Vol. 74(8)

Bleaching of nonwood pulps: can sodium hydroxide be replaced with sodium carbonate in the alkaline extraction of nonwood pulps?, TAPPI JOURNAL, August 1991, Vol. 74(8)

Journal articles
Open Access
On-machine maintenance, TAPPI JOURNAL, August 1991, Vol. 74(8)

On-machine maintenance, TAPPI JOURNAL, August 1991, Vol. 74(8)

Journal articles
Open Access
Fine paper properties and the effects of wet-end starch when using deinked recycled fiber in an alkaline system, TAPPI JOURNAL, May 1991, Vol. 74(5)

Fine paper properties and the effects of wet-end starch when using deinked recycled fiber in an alkaline system, TAPPI JOURNAL, May 1991, Vol. 74(5)

Journal articles
Magazine articles
Open Access
Editoral: Investing in the future: Writing and peer-reviewing for TAPPI Journal, TAPPI Journal July 2024

ABSTRACT: Those who actively participate in TAPPI realize how much there is to gain from the networking, educational resources, career development, and other opportunities that come with this involvement. One important opportunity is the ability to share your work and expertise with others in your field, and an excellent way to do this is by taking part in the TAPPI Journal peer-review process, either as an author or a reviewer or both.

Journal articles
Magazine articles
Open Access
Tetraethyl orthosilicate-containing dispersion coating — water vapor and liquid water barrier properties, TAPPI Journal September 2021

ABSTRACT: An aqueous styrene-butadiene latex dispersion coating containing in-situ processed tetraethyl orthosilicate (TEOS) applied on paperboard demonstrated improved water barrier performance. Coatings containing TEOS equivalent to 0.8% silicon dioxide (SiO2; dry basis) exhibited water vapor performance of < 25 g/m2/day (23°C, 50% relative humidity [RH]) and liquid water barrier performance Cobb 1800 s of < 6 g/m2, when applied as a single-layer 18 g/m2 coating. Cobb 1800 s barrier performance was still good (< 11 g/m2) at coat weights of 7•10 g/m2. The use of filler materials such as kaolin improved the vapor barrier properties of the coating, but this was not critical to the liquid water barrier properties.

Journal articles
Magazine articles
Open Access
Commercially relevant water vapor barrier properties of high amylose starch acetates: Fact or fiction?, TAPPI Journal September 2021

ABSTRACT: Starches have recently regained attention as ecofriendly barrier materials due to the increased demand for sustainable packaging. They are easily processable by conventional plastics processing equipment and have been utilized for oil and grease barrier applications. While starches have excellent oxygen barrier properties and decent water barrier properties at low relative humidity (RH), they are moisture sensitive, as demonstrated by the deterioration of the barrier properties at higher RH values. Starch esters are chemically modified starches where the hydroxyl group of the starch has been substituted by other moieties such as acetates. This imparts hydrophobicity to starches and has been claimed as a good way of retaining water vapor barrier properties of starches, even at high RH conditions. We studied the water vapor barrier properties of one class of starch esters, i.e., high amylose starch acetates that were assumed to have good water vapor barrier properties. Our investigations found that with a high degree of substitution of hydroxyl groups, the modified starches did indeed show improvements in water vapor response as compared to pure high amylose starch films; however, the barrier properties were orders of magnitude lower than commercially used water vapor barriers like polyethylene. Even though these materials had improved water vapor barrier response, high amylose starch acetates are likely unsuitable as water vapor barriers by themselves, as implied by previous literature studies and patents.

Journal articles
Open Access
A financial analysis of north american pulp, paper and packaging firms, TAPPI JOURNAL, September 1999, Vol. 82(9)

A financial analysis of north american pulp, paper and packaging firms, TAPPI JOURNAL, September 1999, Vol. 82(9)

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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