CORDIS proporciona enlaces a los documentos públicos y las publicaciones de los proyectos de los programas marco HORIZONTE.
Los enlaces a los documentos y las publicaciones de los proyectos del Séptimo Programa Marco, así como los enlaces a algunos tipos de resultados específicos, como conjuntos de datos y «software», se obtienen dinámicamente de OpenAIRE .
Resultados aprovechables
Objectives of the project:
The manufacturing of paper from pulp requires a large amount of energy and a major part of the energy consumption is connected with de-watering (i.e. the removal of water from the pulp) and consolidation. A number of high-temperature wet pressing processes have been envisaged which could make a major impact on the efficiency of de-watering and consolidation. The introduction of such processes in paper manufacturing is expected to result in major energy savings, more efficient use of raw materials and a considerable reduction in the capital costs of new paper machines. They will also make it possible to enhance the quality of the products and even to develop new products using chemical reactions such as cross-linking (e.g. as are utilised in medium-density fibreboard pressing). The objective of this project has been to generate the necessary scientific and technical knowledge required for the understanding of new high-temperature wet pressing processes and for the proper design and operation of such processes.
Results achieved:
A good understanding of the physics of high-temperature pressing has been achieved. This understanding has led to the development of a mathematical model of high-temperature wet pressing The predictive capability of the model is quite good within the range of temperatures and linear loads of interest in high-temperature pressing. This has been demonstrated with help of data from extensive trials on EuroFEX. A calibrated model can give considerable information about changes in the state of the web as it passes through the nip. The information obtained from the model can give insights about the mechanisms that are active in the nip under specific design and operating conditions. Thus the model can be a valuable tool in the design and operation of high-temperature pressing.
The model developed requires information regarding the permeability and rheology of wet webs in compression. This information has been generated by the project with the help of specially designed equipment. In particular, two accurate permeameters (for wet fibre webs and press felts respectively) have been built. Databases have been designed containing data on permeability, rheology and heat transfer phenomena.
The original high-temperature pressing units on EuroFEX have been redesigned based on the results of many trials performed on EuroFEX. Both the shoe-element and the heated counter roll have been redesigned and the new designs installed on EuroFEX. Further trials on EuroFEX with new design high-temperature pressing units have shown that the new design resulted in more flexible and efficient operation.
Laboratory experiments indicate that the risk of delamination of the fibre web can be reduced if a thin metal band instead of a heated metal roll heats the web. The use of thin bands could also improve the total energy efficiency of high temperature pressing, and simplify the conversion of existing shoe presses to high temperature pressing units.
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