Search for dissertations about: "humidity effect paper"
Showing result 1 - 5 of 39 swedish dissertations containing the words humidity effect paper.
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1. Laboratory method for the study of moisture-induced waviness in paper
Abstract : Paper that is subjected to moisture undergoes dimensional changes. It expands during moistening and shrinks during drying. When the paper is under tension between rollers, the effects are complex since shrinkage and expansion are restricted in the width direction. Waves can then appear on the paper web. READ MORE
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2. Influence of paper properties and polymer coatings on barrier properties of greaseproof paper
Abstract : Greaseproof paper has a dense structure and therefore provides a natural barrier against materials like fat and oils. The barrier is obtained by extensive refining of the pulp. READ MORE
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3. Micro-mechanical mechanisms for deformation in polymer-material structures
Abstract : In this thesis, the focus has been on micro-mechanical mechanisms in polymer-based materials and structures. The first part of the thesis treats length-scale effects on polymer materials. Experiments have showed that the smaller the specimen, the stronger is the material. READ MORE
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4. Chemical Methods for Improving the Fracture Toughness of Paper
Abstract : Paper is a network material composed of a great number of fibers that interact with each other through fiber joints. In order to make a clear statement regarding observed changes being made in paper, it is vital to determine the structural level of paper that is being affected by chemical modifications. READ MORE
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5. The Use of Lignin Derivatives to Improve Selected Paper Properties
Abstract : 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. READ MORE