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Journal articles
Magazine articles
Open Access
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.

Journal articles
Open Access
Treatment of edta-containing pulp and paper mill wastewaters in activated sludge plants, TAPPI JOURNAL, February 1999, Vol. 82(2)

Treatment of edta-containing pulp and paper mill wastewaters in activated sludge plants, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Working in eastern europe: an engineer's experience paper industry, TAPPI JOURNAL, February 1999, Vol. 82(2)

Working in eastern europe: an engineer's experience paper industry, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Shop talk: dryer grinding in mills producing packaging and graphics paper, TAPPI JOURNAL, February 1999, Vol. 82(2)

Shop talk: dryer grinding in mills producing packaging and graphics paper, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Effect of Fiber Length and Coarseness on the Burst Strength of Paper, TAPPI JOURNAL, January 1999, Vol. 83(5)

Effect of Fiber Length and Coarseness on the Burst Strength of Paper, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Wet End Optimization for a Neutral PCC Filled Newsprint Machine, TAPPI JOURNAL, January 1999, Vol. 83(5)

Wet End Optimization for a Neutral PCC Filled Newsprint Machine, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Use of Mercury Porosimetry to Characterize Pore Structure and Model End-use Properties of Coated Papers - Part 1: Optical and Strength Properties, TAPPI JOURNAL, January 1999, Vol. 83(5)

Use of Mercury Porosimetry to Characterize Pore Structure and Model End-use Properties of Coated Papers - Part 1: Optical and Strength Properties, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Single-Site Catalyst Produced Polyolefin Plastomers for Extrusion Coating and Laminating, TAPPI JOURNAL, January 1999, Vol. 83(5)

Single-Site Catalyst Produced Polyolefin Plastomers for Extrusion Coating and Laminating, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Australia's Paper and Forestry Forum: A Preview of Significant Issues for 1998-2008, TAPPI JOURNAL, January 1999, Vol. 83(5)

Australia's Paper and Forestry Forum: A Preview of Significant Issues for 1998-2008, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Cutting Tool Materials, Manufacturing Processes, and Their Practical Effect on Sheeting and Slitting Quality, TAPPI JOURNAL, January 1999, Vol. 83(5)

Cutting Tool Materials, Manufacturing Processes, and Their Practical Effect on Sheeting and Slitting Quality, TAPPI JOURNAL, January 1999, Vol. 83(5)

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