Search results for "paperinvalmistus"

The Quest for Raw Materials in the British Paper Trade : The Development of the Bamboo Pulp and Paper Industry in British India up to 1939

2018

The British paper trade history was defined since the mid-1850s by a quest for a new raw material to replace rags. The requirements of the paper trade were first met by a discovery that esparto grass from Spain, and later from North Africa, could be utilised in British mills. Beginning in the late 1870s, the success of using esparto encouraged mill developments in British India. The increased dependence on imported wood pulp, the likelihood of a pulp famine, and the consequent increase in price for imported wood pulp drew attention to the possibility of making commercial volumes of good quality pulp from indigenous Indian grasses. Bamboo began being treated after the First World War, when t…

Technological Transformation in the Global Pulp and Paper Industry : Concluding Remarks

2018

The volume has provided us with illustrative, well-documented case studies of technological transformation in the global pulp and paper industry. The research has focused on the roles played by the availability of technology, knowledge, investments, and raw materials on the one hand and demand characteristics on the other, within local, regional, national and transnational organisational frameworks. It has dealt with the relationships between technology transfer, technology leadership, raw material dependence, and product variety on a global scale. The investigation has followed the tradition of in-depth and rich historical descriptions based on primary sources and secondary literature. The…

Technological Transformation in the Global Pulp and Paper Industry : Introduction

2018

At a high level of abstraction, the evolution of any industry is a function of changes in product market demand, availability and supply of capital, energy resources, raw materials knowledge and technology, the surrounding institutional framework and organisational solutions. New technological innovations emerge because of changes in product market demand or institutional framework that encourage entrepreneurs and firms to take advantage of new business opportunities. This contributed volume provides illustrative, well documented case studies of technological transformation in the global pulp and paper industry from the inception of mechanical papermaking in early nineteenth century Europe …

On the mechanical stability and out-of-plane dynamics of a travelling panel submerged in axially flowing ideal fluid : a study into paper production …

2011

Stability of Local Out-of-Plane Deformations of Orthotropic Sheet : Numerical Approach

2018

The stress-strain state and stabilization of viscoelastoplastic, imperfect moving web continuum

2014

Increasing the drying efficiency of cylinder drying

2011

This PhD Thesis concentrates on paper drying: first on the drying rate in a cylinder covered with fabric, enhanced using hot air impingement through the fabric, and its potential effects on paper quality, and second, on the heat transfer rate from hot steam to paper through the cylinder shell. Cylinder drying is a drying method where a heated surface in contact with paper causes water removal from the latter by evaporation. Impingement through the fabric of hot air has been suggested to cause increase in the water removal and drying of paper. Increase in the drying rate by impingement of hot air was confirmed by laboratory tests and by simulations. In laboratory tests the increase in the dr…

On modelling and stability of axially moving viscoelastic materials

2013

Analysis of stability of axially moving orthotropic membranes and plates with a linear non-homogeneous tension profile

2011

Determination of Fibre Orientation Distribution from Images of Fibre Networks

2003

We recall two categories of algorithms for estimating fibre orientation distribution from an image of a spatial fibre system. In the first algorithm, the estimate is a magnitude-weighted distribution from angles perpendicular to the directions of the gradients in the image. The second algorithm is based on the scaled variogram of grey values scanned along a sampling line and its relation to the fibre orientation distribution. Using lines in several directions and assuming a parametric model for the orientation distribution, the orientation parameters are estimated numerically from a least-squares type procedure. Two versions of variogram-based methods are used in this work. We compare the p…