Sökning: "Herbert Sixta"
Hittade 3 avhandlingar innehållade orden Herbert Sixta.
1. Aspects on Strenght Delivery and Higher Utilisation of the Strength Potential of Kraft Pulp Fibres
Sammanfattning : Studies on strength delivery and related fields have so far concentrated on finding the locations in the mill where fibres are damaged and what the damages consist of. However, fibres will invariably encounter mechanical stresses along the fibreline and in this thesis a new concept is introduced; the vulnerability of fibres to mechanical treatment. LÄS MER
2. Activation of dissolving pulps prior to viscose preparation
Sammanfattning : The conventional viscose manufacturing process is a mature process that needs to be improved with respect to its environmental impact and its production cost structure. Therefore a research study has been done with the aim to improve the reactivity of the dissolving pulp used, in order to reduce the chemical demand in the viscose process and thus reduce the cost and indirectly the environmental impact. LÄS MER
3. Conversion of Wood and Non-wood Paper-grade Pulps to Dissolving-grade Pulps
Sammanfattning : Dissolving-grade pulps are commonly used for the production of cellulose derivatives and regenerated cellulose. To obtain products of high quality, these so-called "special" pulps must fulfill certain requirements, such as high cellulose content, low hemicellulose content, a uniform molecular weight distribution and high cellulose reactivity. LÄS MER