FIELD: heating.
SUBSTANCE: claimed furnace comprises a conveyor configured to displace the article processed at the displacement in the furnace. A primary air feed system is arranged to feed the heated flow of primary air. The secondary air feed system is arranged to feed the heated flow of secondary air. A treatment housing is arranged to receive and to retain the article and primary airflow. An insulated housing can receive the flow of the heated secondary airflow. The treatment housing can extend through the said insulated housing and heated secondary airflow. Besides, it can separate the primary airflow from the secondary airflow.
EFFECT: higher efficiency of fibre processing, elimination of further treatment of exhaust gas and simplified processing.
32 cl, 5 dwg
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