Heating element and method of manufacture

Details Heating element and method of manufacture Heating element and method of manufacture

H - Electricity

05

B

H05B 3/10 (2006.01) A41D 13/005 (2006.01) H01C 1/148 (2006.01) H01C 7/00 (2006.01) H01C 17/00 (2006.01) H05B 3/14 (2006.01) H05B 3/34 (2006.01) H05B 3/54 (2006.01)

Patent

CA 2236024

A soft and flexible thin heating element made of electrically conductive carbon carrying fabric is impregnated with a soft filling material. The heating element (29) is shaped by curing the soft filling material and cutting the treated fabric into a desired pattern. The electrical contacts (15) are attached to the ends of the serpentine strips which are electrically connected in parallel or in series. The fabric heating element core (29) is sealed to form a multi-layer assembly having at least two electrically insulating layers (12) which envelop each strip of the heating element core. The heating element is made of non-metallic yarns containing electrically conductive carbon/graphite containing fibers which are woven or stranded into the strips, ropes, sleeves or strands of threads. The selected areas of the heating element core are modified to impart additional electrical properties. An optional positive temperature coefficient (PTC) material is incorporated into said selected areas.

Un élément chauffant mince, doux et flexible, constitué d'un tissu porteur de carbone électroconducteur, est imprégné d'un matériau de remplissage doux. L'élément chauffant (29) est façonné par durcissement du matériau de remplissage doux et découpage du tissu traité selon le motif souhaité. Les contacts électriques (15) sont fixés aux extrémités des bandes en serpentin, lesquelles sont connectées électriquement en parallèle ou en série. L'âme (29) de l'élément chauffant en tissu est scellée de manière à former un ensemble multicouche ayant au moins deux couches électroisolantes (12) enveloppant chaque bande de l'âme de l'élément chauffant. Ledit élément chauffant est constitué de fils non métalliques contenant des fibres contenant du carbone/graphite électroconductrice, lesquelles sont tissées ou toronnées dans les bandes, des câbles, des manchons ou des cordons de fils. Des zones sélectionnées de l'âme de l'élément chauffant sont modifiées afin de conférer des propriétés électriques supplémentaires. On incorpore dans lesdites zones sélectionnées un matériau à coefficient de température positif facultatif.

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