A method of continuous production of lignocellulosic boards

B - Operations – Transporting – 27 – N

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B27N 3/18 (2006.01) B27N 3/08 (2006.01) B27N 3/24 (2006.01)

Patent

CA 2226508

A method for the continuous production of boards having a lignocellulosic fiber material wherein the material is broken up into particles and/or fibers that are dried, glued and formed and pressed to a finished board. The mat is pre-compressed while steam is introduced in such a limited amount during the pre-compression that the temperature of the fibrous mat increases to a value within an interval of 60-95 °Celsius. In this way, the spring back characteristics of the fiber mat is reduced so that its resistance to compression is reduced and the thickness can be reduced more in the pre-compression while the temperature is not so high to initiate a curing process.

L'invention concerne un procédé de fabrication en continu de planches composées de fibres de lignocellulose, dans lequel la matière est décomposée en particules et/ou en fibres qui sont séchées, collées, puis formées et comprimées en une planche finie. Le mat est précomprimé et, pendant cette phase de précompression, on introduit de la vapeur dans une quantité limitée au point que la température du mat de fibres augmente pour atteindre entre 60 et 95 DEG C. De cette façon, les caractéristiques de détente du mat de fibres sont réduites, ce qui permet de réduire également sa résistance à la compression et de diminuer encore l'épaisseur du mat dans la phase de précompression, tout en évitant une température élevée au point de déclencher un durcissement.

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