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Application of polyallylamine as a dry strength agent for paper, TAPPI JOURNAL, December 2000, Vol. 83(12)

Application of polyallylamine as a dry strength agent for paper, TAPPI JOURNAL, December 2000, Vol. 83(12)

Effect of the paper structure and composition on the surface sizing pick-up, TAPPI JOURNAL, December 2000, Vol. 83(12)

Effect of the paper structure and composition on the surface sizing pick-up, TAPPI JOURNAL, December 2000, Vol. 83(12)

Great northern paper revitalizes millinocket mill, TAPPI JOURNAL, December 2000, Vol. 83(12)

Great northern paper revitalizes millinocket mill, TAPPI JOURNAL, December 2000, Vol. 83(12)

Pulping of aspen wood in acetic acid media: effect of operating conditions on yield and pulp properties, TAPPI JOURNAL, December 2000, Vol. 83(12)

Pulping of aspen wood in acetic acid media: effect of operating conditions on yield and pulp properties, TAPPI JOURNAL, December 2000, Vol. 83(12)

The business of research: strategies for the future, TAPPI JOURNAL, December 2000, Vol. 83(12)

The business of research: strategies for the future, TAPPI JOURNAL, December 2000, Vol. 83(12)

The forest products industry: a sustainable industry, TAPPI JOURNAL, December 2000, Vol. 83(12)

The forest products industry: a sustainable industry, TAPPI JOURNAL, December 2000, Vol. 83(12)

Influence of voids on the engineering constants of paper part 2: void modeling, TAPPI JOURNAL, December 1994, Vol. 77(12)

89APR177

MD microstriations in paper: a two-sided shrinkage phenomenon?, TAPPI JOURNAL April 1989

Research on flame-retardant paper prepared by the method of in-pulp addition of ammonium polyphosphate, TAPPI Journal May 2023

ABSTRACT: At present, the production of flame-retardant paper usually uses the impregnation method of phosphorus-nitrogen flame retardants in paper. There are few reports on the application of an in-pulp addition method. In this paper, the solubility of ammonium polyphosphate (APP) and its effect on flame-retardant paper were investigated for use in an in-pulp addition method. It was found that APP particles were square, with an average particle size of 21.88 µm. The particle size decreased significantly after immersion in water at 25°C for 24 h. Furthermore, most of the APPs were dissolved after immersion in water at 90°C for 0.5 h, and the residuals agglomerated and their shape turned into an amorphous form. The APP possessed strong electronegativity and could partially ionize in water. The solubility of APP was 0.18 g/100 mL water at 25°C and increased quickly when the temperature was higher than 30°C. Therefore, APP should be added to the pulp at temperatures below 30°C. The tensile strength of the paper initially increased with the addition of APP, and it reached the maximum value when the APP content was 10% and then gradually decreased. The limiting oxygen index (LOI) value of the paper was 28.7% when the added amount of APP was 30% and cationic polyacrylamide (CPAM) was 0.08%, reaching the flame-retardant level.

Dissolution of wood components during hot water extraction of spruce, TAPPI Journal May 2023

ABSTRACT: The purpose of this study was to investigate the autohydrolysis of softwood, which is the main chemical operation in both hot water extraction and steam explosion. Control of the process and monitoring its course were ensured by the careful choice of experimental setup and conditions: a milled spruce material was extracted in a small flow-through reactor to minimize degradation of the dissolved material and to enable analysis of the resulting liquors extracted at selected time points. The obtained liquid and solid fractions were analyzed for sugar composition and acetic acid concentration. The results showed that partially degraded hemicelluloses were extracted; hemicelluloses side chains were cleaved off and detected as monomers, while deacetylation was limited. Chain scissions of cellulose were observed as a result of autohydrolysis.