Binding particulate materials to manufacture articles

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 31/08 (2006.01) B27N 1/00 (2006.01) B27N 1/02 (2006.01) B27N 3/00 (2006.01) B27N 3/08 (2006.01) B27N 5/00 (2006.01) B27N 7/00 (2006.01) B29C 31/00 (2006.01) B29C 31/04 (2006.01) B29C 35/00 (2006.01) B29C 35/02 (2006.01) B29C 39/00 (2006.01) B29C 39/24 (2006.01) B29C 39/38 (2006.01) B29C 67/00 (2006.01) B29C 71/00 (2006.01) D21J 1/00 (2006.01) D21J 3/00 (2006.01)

Patent

CA 2725371

Methods and apparatus are disclosed for binding of particulate materials to manufacture articles including continu-ous panels or sheets (22). Particulate feed materials arc mixed with a heat curable binder and the mixture (21) is fed to and compressed in a die (25). A radio frequency (RF) field is applied across electrodes (28, 29) between which the mixture is held com-pressed to inductively or dielcctrically heat and cure the binder. Prior to entering the die (25) the mixture is first fed to an intake zone (32) where the mixture is shaped into substantially the same shape as the shape of the mixture in the die so that any curing of the binder due to heating of the mixture in the intake zone (32) occurs while the mixture is in the desired final shape. Operating parameters including shape and dimensions of the intake zone, mixture advancement lengths, are disclosed.

L'invention porte sur des procédés et un appareil pour lier des matières particulaires pour fabriquer des articles dont des panneaux ou feuilles continus (22). Les matières particulaires de la charge d'alimentation sont mélangées avec un liant thermodurcissable et le mélange (21) est introduit et comprimé dans une matrice (25). Un champ de radiofréquences (RF) est appliqué entre des électrodes (28, 29) entre lesquelles le mélange est maintenu comprimé pour chauffer et faire durcir de façon inductive ou diélectrique le liant. Avant d'entrer dans la matrice (25) le mélange est d'abord introduit dans une zone d'admission (32) où le mélange est façonné pratiquement sous la même forme que celle du mélange dans la matrice de sorte que tout durcissement du liant dû au chauffage du mélange dans la zone d'admission (32) a lieu alors que le mélange est sous la forme finale souhaitée. L'invention porte sur des paramètres de fonctionnement comprenant la forme et les dimensions de la zone d'admission, les longueurs de développement du mélange.

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