We shall work primarily with the roller-pressing of pine in combination with different preheating and cooling methods to steer the compression and lock the densified layer.
The primary goal
· Swedish pine (deal) is an attractive competitive material on both the national and international markets for floors and surfaces subject to wear, a material manufactured by the timber industry in Northern Sweden. To develop basic processes and make possible processes such as surface densification, steering of annual ring orientation, impregnation etc., which can take advantage of the value of high-quality pinewood,
Goals while the project is in progress
· A method for the densification and locking of a densified surface
· A process description from log to a finished densified product, including a financial analysis, adapted to one or more specific companies.
Goals when the project is completed
· An environment-friendly process for the surface densification of Swedish pine
· A process suitable for at least one product, e.g. flooring.
· At least one concept for the high-quality refining of slender pine.
The motivation for the project is the deteriorating market appeal of the high-quality northern pine, which is not only the basis of the local joinery industry but also an important export product from the northern sawmills. It is difficult to obtain payment corresponding to the intrinsic value of this high-quality material.
The causes are complex, and it is not possible to include all aspects in a single project. This project thus focuses on one of the major weaknesses of pine –its low hardness – and on one of its greatest assets – its aesthetic and tactile properties. In large marketing segments such as flooring and other surfaces subject to wear, the hardness of the surface is decisive for the function and aesthetic appearance, and this is the customer’s major concern. The hardness of wood is strongly linked to its density, and the relatively low density of Swedish pine is the reason for its lack of hardness. Hardness can be increased in different ways, but in this project the emphasis will be on the sawing pattern, brushing of the surface, and surface densification.
High-quality pine is associated with mature trees, but silvicultural methods require thinning, and the cutting of slender trees before they reach maturity. For both environmental and financial reasons, these slender trees must be utilised in a value-added manner, but they contain a large proportion of juvenile wood which can only with difficulty be used in high-quality products. This project will tackle the question of how these slender trees can be refined to give high-quality products.