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Journal articles
Open Access
Structure characterization of ground calcium carbonate flocs by fractal analysis and their effects on handsheet properties, TAPPI JOURNAL March 2013

Structure characterization of ground calcium carbonate flocs by fractal analysis and their effects on handsheet properties, TAPPI JOURNAL March 2013

Journal articles
Open Access
CFD-modeling of fume formation in kraft recovery boilers, TAPPI JOURNAL March 2013

CFD-modeling of fume formation in kraft recovery boilers, TAPPI JOURNAL March 2013

Journal articles
Open Access
Effect of carboxymethylcellulose and starch depressants on recovery of filler and fines in tertiary flotation, TAPPI JOURNAL March 2013

Effect of carboxymethylcellulose and starch depressants on recovery of filler and fines in tertiary flotation, TAPPI JOURNAL March 2013

Journal articles
Open Access
Editorial: TAPPI Fellows: A distinguished industry group, TAPPI JOURNAL May 2013

Editorial: TAPPI Fellows: A distinguished industry group, TAPPI JOURNAL May 2013

Journal articles
Open Access
Coat weight control in bent blade mode, TAPPI JOURNAL May 2013

Coat weight control in bent blade mode, TAPPI JOURNAL May 2013

Journal articles
Open Access
Current Pulp Production in Japan and its Research and Techno

Current Pulp Production in Japan and its Research and Technological Topics, 1994 International Pan Pacific Conference Proceedings

Journal articles
Open Access
Case Histories of Three Yankee Cracking Incidents Associated

Case Histories of Three Yankee Cracking Incidents Associated with Shell Edge Extensions, 1991 Engineering Conference Proceedings

Journal articles
Open Access
Electrochemical Removal of Color and Toxicity from Bleached

Electrochemical Removal of Color and Toxicity from Bleached Kraft Effluents, 1994 Environmental Conference Proceedings

Journal articles
Open Access
Progressive Deformation at the Crack Tip in Paper During Mod

Progressive Deformation at the Crack Tip in Paper During Mode 1 Fracture (Part 1 Bond Paper), 1991 International Paper Physics Conference Proceedings

Journal articles
Open Access
Aging and degradation of oil and grease barrier papers coate

ABSTRACT: The long-term performance and stability of bio-based barrier coatings are critical for sustainable packaging. In this study, the aging and degradation of a biobased starch•wax emulsion coating were examined on two different base papers. Coated samples were stored for 8 months at 23°C and 50% relative humidity (RH) in their original reels to minimize external exposure and isolate internal aging effects. Multiple aging intervals were analyzed using advanced methods to assess both chemical composition and physical structure. The water vapor transmission rate (WVTR) of both coated papers increased during the first 15 days, but after eight months, the WVTR dropped below the initial values. Fourier transform infrared (FTIR) results supported these trends by showing a marked rise in the polarity index (PI), occurring predominantly within the first 15 days. The overall observations, including increases in the PI, carbonyl index (CI), and absolute absorbance in the hydroxyl region, confirm that both hydrolysis and oxidation occurred during aging. The gradual increase in the aliphatic C•H stretching peaks indicated that wax components moved toward the surface over time. The non-uniform surface enrichment of oleophilic wax following migration contributed to the decline in Kit rating upon aging by facilitating oil and grease wetting and penetration. At the same time, increased wax concentration at the surface helped improve the water vapor barrier performance during long-term aging. Scanning electron microscopy (SEM) imaging revealed distinct surface cracks over time on the starch-wax emulsion coated papers. The FTIR analysis supported these observations through an increase in the conformational disorder index (CDI) with aging. Physical changes were further reflected in the barrier performance, as the heptane vapor transmission rate (HVTR) increased significantly for both coated papers over the 8-month period.

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