Procedure and apparatus for the fabrication of a blank for a...

B - Operations – Transporting – 27 – N

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B27N 3/14 (2006.01)

Patent

CA 2229150

Procedure for the fabrication of a blank for a structural product, such as a blank for a structural board, from material (1) comprising longer (L) and shorter (S) particles and possibly also particles (F) smaller than these. The particles are mixed with a binding agent and possible additives and then passed into at least one blank former, from where the particles are brought onto a base (10). Longer particles (L) are brought onto the base (10) to form a first surface layer, onto which is brought at least one layer of smaller particles (F, S), and onto this layer is again brought a layer of longer particles (L) to form a second surface layer, the smallest particles (F) being so brought onto the base that they mainly end up in at least one middle layer in the cross-section of the blank while the amount of smallest particles (F) diminishes towards the surface layers as seen in the cross-section of the blank. The invention also relates to an apparatus implementing the procedure and to a blank for a structural product.

Cette invention concerne un procédé de fabrication d'une ébauche de produit structural, une ébauche de panneau structural par exemple, à partir d'un matériau (1) composé de particules longues (L), de particules courtes (S) et, dans certains cas, de particules (F) de dimensions inférieures. Les particules sont mélangées à un liant et, au choix, à divers additifs avant d'être acheminées vers au moins un formeur d'ébauche où elles sont déposées sur une base (10). Les particules longues (L) sont placées sur la base (10) pour former une première couche de surface qui reçoit au moins une couche de particules courtes et petites (S, F), laquelle reçoit à son tour une couche de particules longues formant la seconde couche de surface. Les plus petites particules (F) sont amenées sur la base de façon qu'elles se concentrent au coeur de l'ébauche et diminuent en quantité à mesure que l'on se rapproche des couches de surface comme indiqué par la coupe transversale de l'ébauche. Cette invention concerne également l'installation servant à mettre en oeuvre le procédé ci-dessus, ainsi que l'ébauche de produit structural obtenu.

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