Steam pre-heating in oriented strand board production

B - Operations – Transporting – 27 – N

Patent

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Details

B27N 3/04 (2006.01) B27N 3/18 (2006.01) B27N 3/24 (2006.01) B32B 21/02 (2006.01) B32B 21/13 (2006.01)

Patent

CA 2308547

Oriented strand board (10) is produced using a continuous belt press (22) and using an isocyanate binder with steam exposure of the mat (18) of wood material prior to entry into the press. The steam exposure provides moisture which softens wood fibers and enhances lignin flow in the mat. In addition, the moisture reacts with isocyanate binder to produce polyureas from the isocyanate binder (e.g. the preferred binder is pMDI); thereby reducing the cure conditions (i.e. temperature, pressure and time) required for the press to fuse the mat and binder together. The isocyanate binder also reacts with hydroxyl groups in the cellulose and hemicellulose strands of the wood material to allow both chemical and physical bonds to be created with the wood material. The oriented strand board exiting the press has a higher moisture content and more resistant thickness swell under humid conditions.

L'invention porte sur un panneau (1) à copeaux orientés produit au moyen d'une presse (22) à courroie continue et d'un liant d'isocyanate, par exposition à la vapeur du mat (18) de bois avant son introduction dans la presse. L'exposition à la vapeur génère de l'humidité qui assouplit les fibres ligneuses et intensifie l'écoulement de lignine dans le mat. De plus, l'humidité réagit au liant d'isocyanate en formant des polyurées à partir du liant (le liant préféré étant pMDI), ce qui réduit les conditions de durcissement (température, pression et durée) nécessaires à la presse pour faire fusionner le mat et le liant. Le liant d'isocyanate réagit également à des groupes hydroxyle dans la cellulose et les fibres d'hémicellulose du bois de manière à permettre la formation de liaisons chimiques et physiques avec le bois. Le panneau à copeaux orientés sortant de la presse a une teneur en humidité très élevée et un gonflement en épaisseur plus résistant dans des conditions humides.

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