Apparatus for heat treatment of continuous textile products

Apparatus for heat treatment of continuous textile products, such as yarn, ribbon or strip material, comprising an arrangement of vertical furnaces through which the product successively passes, each furnace having two vertically extending horizontally spaced ducts defining a space therebetween, air blowing nozzles and suction nozzles alternately supported, in pairs, within said space by respective ducts and being connected to said ducts, the upper part of the ducts of a furnace being respectively connected to a blowing fan and to an exhaust fan, the last furnace having means adapted to constitute a height adjustable partition which divides each of the two ducts of this last furnace into an upper part for hot air treatment and a lower part for cold air treatment, said lower part being also equipped with a blowing fan and an exhaust fan, wherein said means is constituted by a series of horizontal first baffles distributed throughout the height of the corresponding duct and selectively operable such that one of said baffles in a closed position forms said movable partition, the other baffles being in an open position.