Fire retardant cellulose preservative treatment process

B - Operations – Transporting – 27 – K

Patent

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B27K 3/02 (2006.01) B27K 3/18 (2006.01) B27K 3/32 (2006.01) B27N 3/00 (2006.01) B27N 9/00 (2006.01)

Patent

CA 2460990

A method for not only preserving cellulose material from deterioration and from fire, but also for producing plywood, chip and particle board with an inexpensive and environmentally acceptable adhesive is described. The cellulose material is processed by spraying, immersing or being subjected to vacuum and pressure application in two steps. One step processes the cellulose material with a sodium silicate preservative solution. Another step processes the cellulose material with a gaseous carbon dioxide. Pressure application, moreover, can be varied in a range not to exceed 250 psi to improve product quality. Moistened cellulose material, treated in the foregoing manner, is coated with a comminuted protein, e.g. soybean meal, and pressed into a cellulose product, typically plywood and chip board.

L'invention porte sur un procédé servant non seulement à préserver les matériaux cellulosiques de la détérioration et du feu, mais également à produire des panneaux de particules et de contre-plaqué à l'aide d'un adhésif économique et favorable à l'environnement. A cet effet le matériau cellulosique de base est traité par pulvérisation, immersion, ou dépression puis compression, en deux étapes: traitement à l'aide de d'une solution protectrice de silicate de sodium; traitement à l'aide de CO¿2? gazeux. On le soumet ensuite à une pression pouvant atteindre 250 psi pour en améliorer la qualité, puis il est revêtu à l'état humide d'une poudre de protéines, par exemple de la farine de soja, et comprimé pour donner des produits cellulosiques, tel que des panneaux de contre-plaqué ou de particules.

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