FIELD: production of chemical filaments. SUBSTANCE: apparatus has housing, at least one heated tubular chamber provided with insulating layer and arranged inside housing, device for supporting elongated material and conveying it through tubular chamber. Tubular chamber is equipped with working medium supplying device, volatile product suction device, detachable cover for condensing and settling of resinous products. Elongated material supporting device is joined with its inoperating surface to tubular chamber surface and is made of material whose thermal conductivity exceeds corresponding parameter of insulating layer. EFFECT: intensified thermal treatment process, improved quality of treated material and provision for uniform properties of material, increased service period between preventive cleaning and recovery procedures. 3 cl, 3 dwg
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