Heating means for thermoplastic bonding

Details Heating means for thermoplastic bonding Heating means for thermoplastic bonding

B - Operations, Transporting

29

C

B29C 65/34 (2006.01) C09J 5/06 (2006.01) C09J 5/10 (2006.01)

Patent

CA 2131617

A heating element for providing localized heating during the thermoplastic bonding of thermoset composite structures is disclosed. Various construction details are developed which disclose an apparatus and method for uniformly heating a bond line. In one embodiment, a heating element (22) includes a resistance heating material (24) sandwiched between two layers of electrical insulation (25) and encased within a layer of thermoplastic material (26). Low resistance electrical leads (28), which extend across the width of the resistance heating material, and a power supply (30) provide electrical energy to raise the temperature of the resistance heating material.

L'invention se rapporte à un élément chauffant servant à produire un réchauffement localisé pendant le soudage thermoplastique de structures composites thermodurcissables. On a mis au point divers détails de constructions, qui permettent d'obtenir un appareil et un procédé pour chauffer uniformément une ligne de soudage. Dans un mode de réalisation, un élément chauffant (22) comprend un matériau chauffant à résistance (24) placé en sandwich entre deux couches d'une isolation électrique (25) et enfoui dans une couche de matériaux thermoplastiques (26). Des conducteurs électriques à faible résistance (28), qui s'étendent sur la largeur du matériau chauffant à résistance, et une source de courant (30) fournissent l'énergie électrique destinée à faire monter la température du matériau chauffant à résistance.

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