FIELD: electricity; heating.
SUBSTANCE: heater contains frame (6) with in-built cylinder (9) made of refractory heat-conducting material, additional cylinder (11) made of refractory material and circumjacent cylinder (9) coaxially, heating resistance element (12) mounted on the cylinder (9) in spiral groove, electrical and heat insulating layer (10) arranged between additional cylinder (11) and frame (6). Heating resistance element (12) is designed as wire on the cylinder (9) in spiral groove. In the second version of heater wire is fixed in spiral groove by means of locating fixture mounted on surface of the cylinder (9) above spiral groove and wire of heater providing air clearance between it and additional cylinder (11). Heater can be designed as separate sections. Separate sections can be parallel interconnected.
EFFECT: heating of long-measuring products for following shape change.
10 cl, 5 dwg
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