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Effects of phosphogypsum whiskers modification with calcium stearate and their impacts on properties of bleached softwood paper sheets, TAPPI Journal September 2021

ABSTRACT: By combining the structural properties and characteristics of phosphogypsum whiskers, a preliminary study on the modification of phosphogypsum whiskers and their application in papermaking was carried out. The effects of reaction temperature, reaction time, and reaction concentration on the solubility and retention of modified phosphogypsum whiskers and the effects of phosphogypsum whiskers on the physical properties of paper under different modified conditions were explored. The research results show that, after the phosphogypsum whiskers are modified with calcium stearate, a coating layer will be formed on the surface of the whiskers, which effectively reduces the solubility of the phosphogypsum whiskers. The best modification conditions are: the amount of calcium stearate relative to the absolute dry mass of the phosphogypsum whisker is 2.00%; the modification time is 30 min, and the modification temperature is 60°C. The use of modified phosphogypsum whiskers for paper filling will slightly reduce the whiteness, folding resistance, burst resistance, and tensile strength of the paper, but the tearing degree and retention of the filler will be increased to some extent.

How to Build a Maintenance 4.0 Roadmap for the Pulp and Paper Industry, Paper360º September/October 2021

How to Build a Maintenance 4.0 Roadmap for the Pulp and Paper Industry, Paper360º September/October 2021

Industry 4.0: New Lexicon, No Limits, Paper360º September/October 2021

Industry 4.0: New Lexicon, No Limits, Paper360º September/October 2021

Learning From a Legacy: How OEM Knowledge Benefits Mills, Paper360º September/October 2021

Learning From a Legacy: How OEM Knowledge Benefits Mills, Paper360º September/October 2021

Plastic Replacements Create New Opportunities, Paper360º September/October 2021

Plastic Replacements Create New Opportunities, Paper360º September/October 2021

Smart Moisture Measurement Tech Optimizes Quality, Paper360º September/October 2021

Smart Moisture Measurement Tech Optimizes Quality, Paper360º September/October 2021

The Paper360° Top 75, Paper360º September/October 2021

The Paper360° Top 75, Paper360º September/October 2021

Furnishing autohydrolyzed poplar weakly alkaline P-RC APMP to make lightweight coated base paper, TAPPI Journal February 2022

ABSTRACT: This work investigated the effects of autohydrolysis pretreatment severity on poplar (Populus tomentosa Carr.) woodchips used to make a type of high-yield pulp (HYP) known as preconditioning followed by refiner chemical treatment, alkaline peroxide mechanical pulp (P-RC APMP). It also investigated the ratios for partially replacing sodium hydroxide (NaOH) with magnesium oxide (MgO) in the high-consistency (HC) retention stage of the P-RC APMP process on the obtained HYP’s properties. The results show that the pretreatment severity of autohydrolysis at combined hydrolysis factor (CHF) = 10.77 and the 50 wt% ratio for partially substituting NaOH with MgO were the optimum conditions for making light-weight coated (LWC) base paper. Compared to the conventional P-RC APMP, the optimized P-RC APMP had similar bulk and higher tensile, burst, and tear indices, as well as opacity, but a slightly lower ISO brightness. When the optimized P-RC APMP and commercial softwood bleached sulfate pulp (SBKP) were blended to make LWC base paper, the most favorable pulp furnish was comprised of 50% optimized P-RC APMP and 50% commercial SBKP. The obtained LWC base paper handsheet had better bulk, and its other properties could also meet the require-ments of LWC base paper.

Better Valves Improve Pulp and Paper Mill Safety, Paper360º July/August 2022

New Standards in Paper Production Water Use, Paper360º July/August 2022