Heating device for sheet material

H - Electricity – 05 – B

Patent

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Details

H05B 3/16 (2006.01) G03G 15/20 (2006.01) H05B 3/12 (2006.01) H05B 3/20 (2006.01) H05B 3/26 (2006.01)

Patent

CA 2188251

A heating device (1) according to the present invention includes a substrate (2) made of a heat-resistant insulating material, a heating resistor layer (3) formed on the substrate (2), and a protective layer (6) formed on the substrate (2) to cover the heating resistor layer (3). The protective layer (6) is formed of glass to which alumina powder having a grain size of no greater than 5 µm is added. The addition proportion of alumina powder is 3-30Wt%, preferably 3-22Wt% and particularly 10-22Wt%. The addition of alumina powder remarkably increases the dielectric strength of the protective layer (6).

Un dispositif de chauffage (1) selon la présente invention comprend un substrat (2) fait d'une matière résistant à la chaleur, une couche électriquement résistante (3) produisant de la chaleur et formée sur ce substrat (2), et une couche protectrice (6) formée sur le substrat (2) de manière à couvrir cette couche électriquement résistante (3) qui produit de la chaleur. La couche protectrice (6) est faite de verre avec addition de poudre d'alumine ayant une grosseur de particules inférieure ou égale à 5 mu m. La proportion de poudre d'alumine est de 3 à 30 % en poids, de préférence 3 à 22 %, et tout particulièrement 10 à 22 %. L'addition de poudre d'alumine augmente remarquablement la rigidité diélectrique de la couche protectrice (6).

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