Abstract: A drawing/false twist texturizing process capable of being implemented during the treatment of the yarn. During the treatment, the point of striction is localized during the drawing phase by bringing about an abrupt break or modification in the trajectory of the yarn while it is rising in temperature in the texturizing zone. This is achieved by pressing on a surface or element allowing the twist imparted by the false-twisting spindle to be taken back as far as the first feed system. The modification in the trajectory of the yarn is achieved in the actual oven either while the yarn is rising in temperature or in the vicinity of the zone where it reaches its optimum treatment temperature.

Abstract: Device for the heat treatment of moving yarns, during, for example, a texturizing stretching operation. The yarn is subject to two successive treatments, one at a high temperature, the other at a normal treatment temperature. The device is one wherein these successive phases are obtained by means of a heating unit formed by a cylindrical assembly comprising two heating zones on either side of which are provided guide means for the yarn. The zones are heated by means of two resistance elements embedded inside the cylindrical assembly. The two resistance elements are mounted in parallel, offset with respect to each other along the length of the unit, and each associated with a thermocouple element enabling temperature to be regulated accurately.

Abstract: Method making it possible to control the temperature prevailing inside a high-temperature oven employed for the treatment of a synthetic yarn, especially during an operation of texturing by false twisting, said method consisting, in the case of a given substance (count and chemical composition), in modifying the temperature inside the oven as a function not only of the speed of travel of said yarn, but also of its count.It is characterized in that said temperature .THETA. in .degree.C. is determined from the general formula:.THETA.=aV+bin which:- V is the speed of travel of the yarn inside the oven in meters per minute (m/min);- a denotes a linear variation coefficient (or slope), itself a function of the count expressed in decitex (dtex);- b denotes a correction factor which is a constant whose value is also determined as a function of the count of the yarn in decitex (dtex).

Abstract: Process allowing the cooling of a yarn (2) in motion at the exit from a heater (5) before it passes through a treatment member such as a false twist spindle (7), consisting in passing the yarn inside a tube (10) through which a current of cool air or other gaseous product passes, the current of air being directed in a direction opposite to the direction of advance of the yarn. It is characterized in that during this cooling phase, the yarn is held in contact with a support or guide surface arranged coaxially inside the tube (10) through which the current of air which flows in the space contained between the external tube (10) and the guide surface.

Abstract: Device for heating a yarn in motion, of the type consisting of an insulating enclosure (15) which surrounds a heater block (E) with which it defines a lengthwise channel inside which the yarn (5) to be treated runs, means for guiding said yarn being provided to ensure its positioning, said heater block (E) consisting of a unit comprising at least two cylindrical sections (A, B) which have different diameters and are arranged one extending the other and which support, over their length, rings (1, 3, 4) equipped with guiding members making it possible to keep the yarn at a constant distance from the surface of small diameter, and making it possible to make the yarn describe a tangent helically with the cylindrical surface of large diameter.It is characterized in that one of the outermost faces (31) of the cowling surrounding the insulating enclosure and the heater block is removable and carries all the connections which make it possible to provide the electrical supply to the oven, its control etc.