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Journal articles
Open Access
On-site aerobic treatment at high and varying process water temperatures, TAPPI JOURNAL, Online Exclusive, May 2003, Vol. 2(5) (248KB)

On-site aerobic treatment at high and varying process water temperatures, TAPPI JOURNAL, Online Exclusive, May 2003, Vol. 2(5) (248KB)

Journal articles
Open Access
A review of gas flows in fiber suspensions, TAPPI JOURNAL, Online Exclusive, November 2003, Vol. 2(11) (775KB)

A review of gas flows in fiber suspensions, TAPPI JOURNAL, Online Exclusive, November 2003, Vol. 2(11) (775KB)

Journal articles
Open Access
Spectroscopic characterization of extractives isolated with MTBE from straws, TAPPI JOURNAL, November 2003, Vol. 2(11) (130KB)

Spectroscopic characterization of extractives isolated with MTBE from straws, Solutions! & TAPPI JOURNAL, November 2003, Vol. 2(11) (130KB)

Journal articles
Open Access
Recovery of water-soluble acetylgalactoglucomannans from mechanical pulp of spruce, TAPPI JOURNAL, November 2003, Vol. 2(11) (145KB)

Recovery of water-soluble acetylgalactoglucomannans from mechanical pulp of spruce, Solutions! & TAPPI JOURNAL, November 2003, Vol. 2(11) (145KB)

Journal articles
Open Access
Behavior of certain components in the vacuum drum washer after the first D stage in ECF bleaching, TAPPI JOURNAL, September 2003, Vol. 2(9) (172KB)

Behavior of certain components in the vacuum drum washer after the first D stage in ECF bleaching, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (172KB)

Journal articles
Open Access
Selective refining actions on repulped long-fiber kraft paper, TAPPI JOURNAL, Online Exclusive, September 2003, Vol. 2(9) (856KB)

Selective refining actions on repulped long-fiber kraft paper, TAPPI JOURNAL, Online Exclusive, September 2003, Vol. 2(9) (856KB)

Journal articles
Open Access
Mechanism of hydrogen peroxide decomposition by manganese dioxide, TAPPI JOURNAL, September 2003, Vol. 2(9) (193KB)

Mechanism of hydrogen peroxide decomposition by manganese dioxide, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (193KB)

Journal articles
Open Access
Pulp yield loss in alkaline peroxide bleaching of aspen CTMP Part 1: Estimation and impacts, TAPPI JOURNAL, September 2003, Vol. 2(9) (145KB)

Pulp yield loss in alkaline peroxide bleaching of aspen CTMP Part 1: Estimation and impacts, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (145KB)

Journal articles
Magazine articles
Open Access
Prehydrolysis kraft pulping of jute cutting and caddis mixture for rayon production

ABSTRACT: Jute cutting, jute caddis, and cutting-caddis mixtures were prehydrolyzed by varying time and temperature to get about 90% prehydrolyzed yield. At the conditions of 170°C for 60 min of prehydrolysis, the yield for 100% jute cutting was 76.3%, while the same for jute caddis was only 67.9%. But with prehydrolysis at 150°C for 60 min, the yield was 90% for jute cutting, where 49.94% of original pentosan was dissolved and prehydrolysis of jute caddis at 140°C in 60 min yielded 86.4% solid residue. Jute cutting-caddis mixed prehydrolysis was done at 140°C for 30 min and yielded 92% solid residue for 50:50 cutting-caddis mixtures, where pentosan dissolution was only 29%. Prehydrolyzed jute cutting, jute caddis, and cutting-caddis mixtures were subsequently kraft cooked. Pulp yield was only 40.9% for 100% jute cutting prehydrolyzed at 170°C for 60 min, which was 10.9% lower than the prehydrolysis at 140°C. For jute cutting-caddis mixed prehydrolysis at 140°C for 45 min followed by kraft cooking, pulp yield decreased by 3.3% from the 100% cutting to 50% caddis in the mixture, but 75% caddis in the mixture decreased pulp yield by 6.7%. The kappa number 50:50 cutting-caddis mixture was only 11.3. Pulp bleachability improved with increasing jute cutting proportion in the cutting-caddis mixture pulp.

Journal articles
Magazine articles
Open Access
Lignin-based resins for kraft paper applications, TAPPI Journal November 2019

ABSTRACT: We investigated miscanthus (MS) and willow (W) lignin-furfural based resins as potential reinforce-ment agents on softwood and hardwood kraft paper. These resins might be sustainable alternatives to the commercial phenolformaldehyde (PF) resins. Phenol is a petrochemical product and formaldehyde has been classified as a carcinogen by the U.S. Environmental Protection Agency. The lignin used in this study was derived from hot water extraction (160ºC, 2 h) of MS and W biomass, and may be considered sulfur-free. These biorefinery lignins were characterized for their chemical composition and inherent properties via wet chemistry and instrumental techniques. The resin blends (MS-resin and W-resin) were characterized for their molecular weight, thermal behavior, and mechanical properties. Mechanical properties were measured by the resin’s ability to reinforce softwood and hard-wood kraft papers. The effect of adding hexamethylenetetramine (HMTA), a curing agent, to the resin was also examined. Mixtures of PF and lignin-based resins were investigated to further explore ways to reduce use of non-renewables, phenol, and carcinogenic formaldehyde. The results show that lignin-based resins have the potential to replace PF resins in kraft paper applications. For softwood paper, the highest strength was achieved using W-resin, without HMTA (2.5 times greater than PF with HMTA). For hardwood paper, MS-resin with HMTA gave the highest strength (2.3 times higher than PF with HMTA). The lignin-based resins, without HMTA, also yielded mechanical properties comparable to PF with HMTA.

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