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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.

Quality Improvement from the Wet End for Board and Packaging Grades, 18PaperCon

Quality Improvement from the Wet End for Board and Packaging Grades, 18PaperCon

Importance Of Paper Machine Building Hall Ventilation: A Rigorous Approach For Evaluation And Problem Solving - Case Studies, 18PaperCon

Importance Of Paper Machine Building Hall Ventilation: A Rigorous Approach For Evaluation And Problem Solving - Case Studies, 18PaperCon

Using UV Technology to Generate Oxygen Radicals for Paper Mill Systems, 18PaperCon

Using UV Technology to Generate Oxygen Radicals for Paper Mill Systems, 18PaperCon

Treatment and Re-use of Mill Effluent using a Breakthrough Anaerobic Reactor, 18PaperCon

Treatment and Re-use of Mill Effluent using a Breakthrough Anaerobic Reactor, 18PaperCon

On Optimization of Paper Machines using Economic Model Predictive Control, 18PaperCon

On Optimization of Paper Machines using Economic Model Predictive Control, 18PaperCon

Mathematical Modeling and Simulation of Initial and Mechanical Dewatering of Paper Web in Paper Machine Sections, 18PaperCon

Mathematical Modeling and Simulation of Initial and Mechanical Dewatering of Paper Web in Paper Machine Sections, 18PaperCon

MULTI-FUNCTIONAL BARRIER COATING SYSTEMS CREATED BY MULTI-LAYER CURTAIN COATING, 2021 TAPPICon Live (21TAPL)

Print quality of flexographic printed paperboard related to coating composition and structure, TAPPI Journal January 2018

Print quality of flexographic printed paperboard related to coating composition and structure, TAPPI Journal January 2018

Viscoelastic web curl due to storage in wound rolls, TAPPI Journal July 2020

ABSTRACT: Winding is often the final operation in a roll-to-roll manufacturing process. Web materials, i.e., materials that are thin compared to their length, are wound into rolls because this form is the only practical means to store them. The resulting bending strains and associated stresses are large for thick webs and laminates. As many webs are viscoelastic on some time scale, bending stresses lead to creep and inhomogeneous changes in length. When the web material is unwound and cut into discrete samples, a residual curvature remains. This curvature, called curl, is the inability for the web to lie flat at no tension. Curl is an undesirable web defect that causes loss of productivity in a subsequent web process. This paper describes the development and implementation of modeling and experimental tools to explore and mitigate curl in homogenous webs. Two theoretical and numerical methods that allow the prediction of curl in a web are developed: a winding software based on bending recovery theory, and the implementation of dynamic simula-tions of winding. One experimental method is developed that directly measures the curl online by taking advantage of the anticlastic bending resulting from the curl. These methods are demonstrated for a low-density polyethylene web.