Method and device for applying a synthetic binder to an...

Details Method and device for applying a synthetic binder to an... Method and device for applying a synthetic binder to an...

B - Operations, Transporting

27

N

B27N 1/02 (2006.01)

Patent

CA 2577923

A method and a device to be used in the process of manufacturing plates, such as fibreboards or the like boards, where the raw material in form of biomass particles, such as wood fibres or the like, applied with a thermosetting binder is spread onto a forming belt to form a mat, and where said mat by means of a hot press is compressed into the desired thickness of the finished plate and the thermosetting binder is hardened. According to the invention the thermosetting binder is applied to the dried biomass particles in an airborne process, where the intense and homogeneous contact of the biomass particles and the droplets of fluent binder are facilitated by the use of ultrasound generated by the use of compressed air, water steam or another gas. Further measures to intensify the contact between the biomass particles and the binder droplets utilizing the dipole moment of the biomass particles, at the same time preventing the binder to stick to the walls of the device, as well as measures and to control moisture content and temperature of the binder-loaded particles are disclosed.

L'invention concerne un procédé et un dispositif à utiliser dans un processus de production de plaques, de type panneau de fibres ou panneaux analogues, selon lequel la matière première se présente sous forme de particules de biomasse, de type fibres de bois ou analogues, appliquées avec un liant thermodurcissant étalé sur un tapis de formage afin que soit formé un mat, ledit mat étant compressé au moyen d'une presse à chaud pour présenter une épaisseur désirée de plaque finie, et le liant thermodurcissant étant durci. Selon l'invention, le liant thermodurcissant est appliqué sur les particules de biomasse séchées dans un processus aérien, le contact intense et homogène des particules de biomasse et des gouttelettes de liant liquide étant facilité au moyen d'ultrasons générés à l'aide d'air comprimé, d'un flux aqueux ou d'un autre gaz. L'invention concerne également d'autres mesures permettant d'intensifier le contact entre les particules de biomasse et les gouttelettes de liant qui impliquent le moment dipolaire des particules de biomasse, ces mesures empêchant également le liant de coller aux parois du dispositif ; ainsi que des mesures permettant de réguler la teneur en humidité et la température des particules chargées par le liant.

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