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Chemical addition to wet webs using foam application, TAPPI Journal January 2023
ABSTRACT: In papermaking, the conventional way to add chemicals to the web is to dose them into the fiber stock and form the paper afterwards. However, in many cases, adding chemicals directly to the stock is challenging. For example, strength aids tend to increase flocculation in the stock, which limits the addition amounts of those aids. The need for better performance of paper (and paperboard) products has given rise to the need for functionalization of paper. Adding such functional chemicals to the stock is usually rather inefficient. Hence, novel methods are needed to add chemicals to the paper bulk. One such method is dosing chemicals to the wet web via foam application. In this study, we built a laboratory-scale sheetfed dynamic foam application device and utilized it to study addition of starch to wet bleached chemithermomechanical pulp (BCTMP) paper handsheets. The impact of parameters such as vacuum level, the amount of added chemical, and the viscosity of the foaming liquid on the penetration of starch into the wet web was explored. Starch penetration into wet webs was measured via iodine-potassium iodide staining, followed by image analysis. According to our results, controlling the viscosity of the foaming liquid gives the best possibility to control the penetration.
Journal articles
Magazine articles
Z-direction chemical analysis for new application methods, TAPPI Journal January 2023
ABSTRACT: In conventional wet-end chemical addition during paper production, chemical distribution through the z-direction of the sheet is usually not considered an important characteristic. With a nontraditional chemical dosing approach, such as foam-assisted additive addition, the chemistry can appear at different concentrations throughout the sheet, typically in a z-direction gradient. To fully understand the strength properties of the sheet, it is helpful to view or quantify the chemical distribution through the sheet in the z-direction. One qualitative method uses a dye technique along with confocal laser scanning microscopy to generate an image where the relative chemical concentration can be observed. A quantitative method involves compiling nitrogen analyses of layered subsections of the sheet into a composite graph of relative chemical concentration vs. the z-direction of the sheet. Chemical distribution analysis can be paired with traditional z-direction strength tests, such as Scott bond and z-direction tensile, to help one understand and improve the chemical addition process and its effects.
Baby Diaper trends around the world and How they affect raw materials suppliers, 2011 Innovative Nonwovens Conference
Baby Diaper trends around the world and How they affect raw materials suppliers, 2011 Innovative Nonwovens Conference
Transformation of the Insulation Industry through Green Building and Indoor Air Quality Standards, 2011 Innovative Nonwovens Conference
Transformation of the Insulation Industry through Green Building and Indoor Air Quality Standards, 2011 Innovative Nonwovens Conference
Industrial Nanofiber Needs of the Technical Textile Industry: A Case Study, 2011 Innovative Nonwovens Conference
Industrial Nanofiber Needs of the Technical Textile Industry: A Case Study, 2011 Innovative Nonwovens Conference
Soy Chemistry Fiber & Film Developments, 2011 Innovative Nonwovens Conference
Soy Chemistry Fiber & Film Developments, 2011 Innovative Nonwovens Conference
Latest Techniques for Web Imaging and Quality Control, 2011 Innovative Nonwovens Conference
Latest Techniques for Web Imaging and Quality Control, 2011 Innovative Nonwovens Conference
High Performance Nonwovens â?Š, 2011 Innovative Nonwovens Conference
High Performance Nonwovens …, 2011 Innovative Nonwovens Conference
Bicomponent Nonwoven Structures for Thermoplastic Composites, 2011 Innovative Nonwovens Conference
Bicomponent Nonwoven Structures for Thermoplastic Composites, 2011 Innovative Nonwovens Conference
Effect of Plasma Treatment on Cotton Nonwovens, 2011 Innovative Nonwovens Conference
Effect of Plasma Treatment on Cotton Nonwovens, 2011 Innovative Nonwovens Conference