Abstract: A method and device for measuring at least one transverse dimension of a textile yarn using an optical system. The measuring device comprises a coherent light source which sends a beam (10) onto a cylindrical lens (11). Two axially movable plates (12, 13) are located on opposite sides of the yarn (14) and define two identical slots (15, 16) to form two secondary sources which are arranged to interfere with the coherent light source directed at a lens (17). The transverse dimension of the yarn is deduced from the spacing between the bands (18) of the resulting interference pattern.

Abstract: The present invention concerns a process and a device for optically measuring the twist of a textile yarn.The device comprises means (20) for lighting up the yarn (10) by a beam of light (11) to form a spot of light (12) which corresponds to the light diffracted by the surface fibres of the compact core of this yarn. The energy repartition of this spot is then analyzed by means such as a rotary analyzer (27) to define the angle of twist by determination of the maximum of energy in the said spot (12).

Abstract: A sealing unit for a heat treatment apparatus for textile threads comprises an upper roller (7) and lower roller (8) between which a conveyor belt (8) passes. The seal between the rollers and the frame (2) of the unit is formed by an upper (29) and lower sealing element (30) with PTFE covers (35) which slide along the rollers, and by two lateral plates (42) contacting the extremities of said covers and of the rollers. Each of said covers is divided into at least two elastically interconnected pieces (35a, 35b) so that the covering shortens when the lateral plates draw closer to each other due to wear against the roller extremities.

Abstract: A heat treatment chamber for textile threads continuously treats the textile threads utilizing forced circulation units of a treatment fluid. The circulation units are these units being crossed consecutively by a conveyor belt that carries a lap of threads. Each circulation unit is provided with a blower and a closed circuit or an open circuit for the treatment fluid (air or steam). A heat exchanger is positioned near the conveyor belt, in such a way that the fluid crosses it and takes the desired temperature immediately before crossing the lap of threads. The heat exchanger can be formed of longitudinal tubes criss-crossed by heating or cooling fluid. Such a chamber is usable either to preheat the threads, to maintain them heated, or to cool them.

Abstract: The present invention concerns a machine for continuously crimping textile threads. The machine (10) comprises a frame composed of a support plate (14) to which there are attached two upper blocks (17a and 17b) defining a compression chamber (18), two elements (19a and 19b) defining a decompression chamber (20) and two paddles (21a and 21b) defining an evacuation chamber (22). The threads are introduced into the compression chamber by two pulleys (25a and 25b). The decompression chamber (20) is supplied with steam through conduits (31a and 31b). The paddles (21a and 21b) are subject to the action of two spring blocks (33a and 33b). This machine is used to cause crimping and bulking of all kinds of threads, and for fixing the crimping and inflation.

Abstract: The invention concerns a sealing unit with rollers (7, 8) for the inlet (5) or the outlet of a treatment apparatus traversed by a conveyor belt (6) passing between the rollers, particularly an air and/or steam pressure apparatus. The sealing means between the frame (2) of the unit and the rollers are designed to be reliable, sturdy and easy to maintain. Specifically, they comprise an upper sealing device (29) and a lower sealing device (30), each one of which is in vertical contact with the corresponding roller (7, 8) and with a fixed element (27, 28). Each one of these devices may comprise a base plate (33) with a shaped slippery covering, consisting of a superficial strip (35) made of PTFE on a strip (34) of compressible flexible material. These devices may be removed without removing the rollers (7, 8). The contact means urging the sealing devices may have springs or hydraulic cylinders (31) or pneumatic cylinders.

Abstract: The object of the present invention is the free retraction of thread spirals placed on a perforated conveyor belt during a heat treatment such as heat retraction or heat fixing of dyes. The device applies shaking movements or vibrations to a vertical component of the perforated belt, especially inside a heat treatment enclosure. It consists of an oscillating rotatable shaft transversely disposed inside the enclosure and applied to the lower surface of the belt. The shaft may have one or more plane surfaces, for example a rectangular transverse section.

Abstract: Continuous process for dyeing a textile thread by impregnation under pressure, followed by fluid extraction. The dye solution is applied to the thread in an impregnation enclosure, the thread then passes into a fluid extraction enclosure under which liquid is recovered to regenerate it and reuse it as dye. A regeneration enclosure is connected to an automatic color analyzer and to a calculation unit controlling the dosing apparatus for colorants.

Abstract: The invention concerns an apparatus for continuous heat treatment of textile thread. The apparatus is designed as a modular unit so that its size may be adapted to each need and treatment parameters adjusted according to its application. The apparatus comprises a conveyor belt (1) transporting thread (13) through a pretreatment chamber (7) and a treatment chamber (8). Each of these chambers (7, 8) comprises one or more enclosure modules (20, 30) containing one or more forced circulation units (21, 31). In the pretreatment chamber (7), each unit (21) causes pretreatment fluid to circulate in a closed circuit. The units (31) in the treatment chamber (8) cause treatment fluid to circulate and may function as an open circuit. Such an apparatus is useful for continuous heat treatment of textile thread, particularly for heat fixing either the physical structure of the thread or dyes.

Abstract: Installation including a steaming chamber, a first, upstream cold chamber and a second, downstream cold chamber, with the length of the upstream cold chamber being at least equal to that of the downstream cold chamber. The upstream and downstream cold chambers may be connected by a pressure-equalized pipe. A fan may be provided to extract the stream at the top of the steaming chamber and reinject it, after reheating by a heating element, into a perforated steaming box from which jets of steam issue below the conveyor belt, which is also perforated. The upstream cold chamber and the steaming chamber may be provided with elements for creating an upstream or downstream temperature gradient to prevent the threads from being subjected to thermal shock during passage through the steaming chamber.

Abstract: Enclosure having a controlled atmosphere for the continuous treatment of textile yarns deposited on a continuous conveyor belt outside the enclosure and transported by the conveyor belt through the enclosure. The enclosure is at least partially sealed and includes an inlet and an outlet which are traversed by the conveyor belt, each having a sealing head with rollers, in which each sealing head includes at least one lower roller and an upper roller which are positioned transversely and across from one another below and above the conveyor belt, respectively. The sealing head is arranged to have a biasing force exerted by one of the rollers in the direction of the other in a manner so as to tighten the conveyor belt and yarns that it carries between them. The biasing arrangement includes at least one hydraulic jack connected to a hydraulic pressure source via a control and adjustment device.