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Journal articles
Open Access
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
Open Access
1987 TAPPI bar code survey, TAPPI JOURNAL July 1988

1987 TAPPI bar code survey, TAPPI JOURNAL July 1988

Journal articles
Open Access
Optimization of filter washer operation and control, July 1988, TAPPI Journal 88JUN101

Optimization of filter washer operation and control, TAPPI JOURNAL June 1988

Journal articles
Open Access
Characterization of particles in liquid suspension, July 1988, TAPPI Journal 88JUN105

Characterization of particles in liquid suspension, TAPPI JOURNAL June 1988

Journal articles
Open Access
Phosphate Fertilizer Value of Paper Mill Residuals, TAPPI JOURNAL, April 2006, Vol. 5(4) (79 KB)

Phosphate Fertilizer Value of Paper Mill Residuals, TAPPI JOURNAL, April 2006, Vol. 5(4) (79 KB)

Journal articles
Open Access
Linking Pulp Variations to TMP Operation by Better Selection

Linking Pulp Variations to TMP Operation by Better Selection and Treatment of Process Data

Journal articles
Open Access
An examination of two hybrid top-wire former configurations for producing newsprint, TAPPI JOURNAL, October 2003, Vol. 2(10) (300KB)

An examination of two hybrid top-wire former configurations for producing newsprint, Solutions! & TAPPI JOURNAL, October 2003, Vol. 2(10) (300KB)

Journal articles
Open Access
Comparing the fiber flocculation behavior of several wet-end retention systems, Solutions! & TAPPI JOURNAL, April 2004 (251KB)

Comparing the fiber flocculation behavior of several wet-end retention systems, Solutions! & TAPPI JOURNAL, April 2004 (251KB)

Journal articles
Magazine articles
Open Access
Effect of pressure and time on water absorption of coated paperboard based on a modified Cobb test method, TAPPI Journal April 2024

ABSTRACT: This manuscript presents the study of water absorption by paperboard subjected to water at high hydrostatic pressure based on a modified Cobb tester. The new tester is based on TAPPI Standard Test Method T 441; however, the water column can reach up to 550 mm. The evaluation consisted of measurements of water absorption for coated and uncoated paperboard at different exposure times from 5 s to 45 s and water column heights from 10 mm to 500 mm (corresponding to hydrostatic pressures 98 Pa and 4.9 kPa, respectively). The coatings were formulated as a combination of styrene acrylate (SA; two binder levels) and two types of ground calcium carbonates (differing particle sizes) to form the two pre-coating structures: open and closed. The coating weight was 6 g/m2 applied on 210 g/m2 solid bleached board (SBB). In addition, 210 g/m2 uncoated boards were studied. Characterization of the coatings was performed with scanning electron microscopy (SEM), mercury intrusion, and roughness. It was found that the new device properly mimics the conditions of the current Cobb tester. The characterization of the coating also confirmed the presence of more open/larger pores of open coatings, confirming the desired coating structure. The absorption of boards was mainly driven by exposure pressure by comparing with exposure time. This was already evident after shorter periods of exposure time at 5 s and also 15 s exposure time. Paperboards with open coatings showed slightly higher absorption than other boards.

Journal articles
Magazine articles
Open Access
Dynamic out-of-plane compression of paperboard — Influence of impact velocity on the surface, TAPPI Journal February 2024

ABSTRACT: Processes that convert paperboard into finished products include, for example, printing, where the paperboard is subjected to rapid Z-directional (ZD) compression in the print nip. However, measuring and evaluating the relevant properties in the thickness direction of paperboard are not necessarily straightforward or easy. Measuring at relevant, millisecond deformation rates further complicates the problem. The aim of the present work is to elucidate some of the influences on the compressive stiffness. Both the initial material response and the overall compressibility of the paperboard is studied. In this project, the effect on the material response from the surface structure and the millisecond timescale recovery is explored.The method utilized is a machine called the Rapid ZD-tester. The device drops a probe in freefall on the substrate and records the probe position, thus acquiring the deformation of the substrate. The probe is also allowed to bounce several times on the surface for consecutive impacts before being lifted for the next drop. To investigate the time dependent stiffness behavior, the probe is dropped several times at the same XY position on the paperboard from different heights, thus achieving different impact velocities. The material response from drops and bounces combined allows study of the short-term recovery of the material. The material in the study is commercial paperboard. The paperboard samples are compared to material where the surface has been smoothed by grinding it. Our study shows that there is a non-permanent reduction in thickness and a stiffening per bounce of the probe, indicating a compaction that has not recovered in the millisecond timescale. Additionally, a higher impact velocity has an initial stiffening effect on the paperboard, and this is reduced by smoothing the surface.

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