Sökning: "paper strength"
Visar resultat 26 - 30 av 564 avhandlingar innehållade orden paper strength.
26. Polyelectrolyte complexes : their preparation, adsorption behaviour and effect on paper properties
Sammanfattning : In this work, the formation of polyelectrolyte complexes (PECs) has been studied using a jet mixing method not previously used for mixing polyelectrolytes. The PECs were formed from two weak polyelectrolytes, i.e. LÄS MER
27. Experimental validation and numerical upscaling of linear network models for simulation of paper
Sammanfattning : Paper modeling results in complex geometries that lead to enormous numerical problems. The complexity lies in the material's microstructure. Individual paper fibers must be considered for useful material simulations in paper development, where wood composition and other fiber-based parameters are essential. LÄS MER
28. Dynamic Mechanical Studies of Wood, Paper and some Polymers Subjected to Humidity Changes
Sammanfattning : The dynamic mechanical response of several hygroscopic materials including wood (Scots pineveneer), paper (unbleached sulphate), cellophane, polyamide 6 (PA6) and poly(vinyl acetate)(PVAc) have been studied especially under conditions of a stepwise varying humidity in the atmosphere surrounding the samples. In all cases the in phase and out of phase components of the force necessary to achieve a given deformation were measured for various oscillation frequencies (from 0. LÄS MER
29. The Use of Lignin Derivatives to Improve Selected Paper Properties
Sammanfattning : Ved består huvudsakligen av tre typer av polymerer, cellulosa, hemicellulosa och lignin. Lignin bildas i naturen genom enzymatiskt initierad oxidativ koppling av tre olika typer av fenylpropan-enheter. Dessa bygger genom olika kol-kol- och kol-syre-bindningar upp en amorf tredimensionell polymer. LÄS MER
30. The effects of cellulosic fiber charges on polyelectrolyte adsorption and fiber-fiber interactions
Sammanfattning : The surface charges of cellulosic fibers contribute to several papermaking operations that influence the manufacture and final properties of paper. This thesis investigates the effect of the surface charges on wet-end chemistry, e.g. LÄS MER