Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Committees
Collections
Journal articles
Magazine articles
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
Magazine articles
Evaluation of soap recovery efficiency from black liquor — analytical tools, TAPPI Journal April 2023
ABSTRACT: Soap skimmings (“soap”) are typically recovered from black liquor in kraft mills that process a high percentage of softwood. In many mills, the recovery of soap is inefficient, negatively impacting performance of evaporators and recovery boilers and resulting in loss of potential revenue. A thorough evaluation of soap recovery performance in a kraft mill requires measurement of soap content in black liquor at various sampling locations, especially around the soap skimmer.The standard laboratory method for evaluating soap content in black liquor is a complex, multi-step process that relies on solvent extraction and titration; most mills send these samples to an outside laboratory for this analysis. In this study, 100 black liquor samples, with a wide range of soap concentrations, were tested by the standard solvent extraction method. After additional dilution, each sample was also tested for surface tension with a bubble pressure tensiometer. The results were found to correlate very closely with the solvent extraction tests results. This alternate method, using surface tension measurements of diluted black liquor samples, produces rapid results and can be easily implemented in most kraft mills, which would facilitate much more frequent in-house evaluations of soap recovery performance.
Journal articles
Characterization of refined papermaking pulps using hydrodynamic parameters from filtration analysis, TAPPI JOURNAL May 2015
Characterization of refined papermaking pulps using hydrodynamic parameters from filtration analysis, TAPPI JOURNAL May 2015
Journal articles
Valves: corrosion and maintenance, TAPPI JOURNAL, August 1993, Vol. 76(8)
Valves: corrosion and maintenance, TAPPI JOURNAL, August 1993, Vol. 76(8)
Journal articles
A systems approach to consistency control and dry stock blend, TAPPI JOURNAL July 1988
A systems approach to consistency control and dry stock blend, TAPPI JOURNAL July 1988
Journal articles
Women in the industry-Still rare, women are working hard to progress, TAPPI JOURNAL July 1988
Women in the industry-Still rare, women are working hard to progress, TAPPI JOURNAL July 1988
Journal articles
Methodology and approach for understanding and optimizing existing plant thermal cycles, TAPPI JOURNAL July 1988
Methodology and approach for understanding and optimizing existing plant thermal cycles, TAPPI JOURNAL July 1988
Journal articles
On-line measurement of wood chip size, TAPPI JOURNAL July 1988
On-line measurement of wood chip size, TAPPI JOURNAL July 1988
Journal articles
The role of use-attainability analysis in determining standards for water quality-The Androscoggin River (Maine) case study, TAPPI JOURNAL July 1988
The role of use-attainability analysis in determining standards for water quality-The Androscoggin River (Maine) case study, TAPPI JOURNAL July 1988
Journal articles
Optimization of filter washer operation and control, July 1988, TAPPI Journal 88JUN101
Optimization of filter washer operation and control, TAPPI JOURNAL June 1988