Abstract: The invention concerns a welded stainless steel tube for use in fluid evaporation techniques, particularly a food fluid, characterized in that it comprises, on its outer heat-exchanging surface, mostly smooth, localized means for accumulating and conducting condensations generated on the heat-exchanging smooth surface, means consisting of elevations in the form of shoulders extending over the length of the tube and capable of forming recesses distributed over said tube length.

Abstract: The invention relates to a device for the continuous treatment of a semi-worked filamentary of strand-like metal material of indefinite length, arranged helically, of which the turns, supported and driven by rotating horizontal shafts, are immersed in a treating agent.An apparatus of this kind comprises two capstans or winches fitted with idle satellites or rollers; two strands of material coming from delivery units are bent thereon and assume the shape of two helices supported and driven respectively by pairs of horizontal shafts, and immersed in a treatment agent contained in a tank. The two helices rotate in opposite directions their turns interpenetrating, so that they guide each other; the size of each turn is regulated at the same time, if it increases, by its possible contact with one of the shafts bearing the other helix, and by the distance, adjustable during operation, between the two shafts of the pair bearing it.

Abstract: An apparatus including combined means to control the size of helicoidal loops of an elongated flexible material and the linear speed of said material carried by horizontal rotary shafts and dipping into a treating agent inside a volume: the material inlet speed controls the speed of one of the shafts; it is positively driven up at the outlet; the effective linear speed inside the volume and the size of the loops are controlled by combined drives using different frictional properties of the material against the shafts and one wall sector of the volume, suitably covered for short temporary stopping contacts.