Abstract: A roll for guiding at least one yarn in a yarn processing operation and comprising a tubular roll sleeve which is mounted for free rotation on a support by a plurality of bearings. At least one of the bearings is constructed as a radially operative magnetic bearing, which comprises a plurality of bearing pole windings distributed in the circumferential direction of the roll sleeve and which have predetermined pole cross sections. At least one of the bearing pole windings has a pole cross section which is larger or smaller than the pole cross sections of one or more of the other bearing pole windings, so as to permit the load profile imparted to the sleeve by a running yarn to be balanced over the circumference of the sleeve.

Abstract: A godet for guiding at least one advancing yarn in a yarn processing operation. The godet comprises a tubular casing which is mounted for free rotation on a support by means of a plurality of bearings. At least one of the bearings is a radially operative magnetic bearing, which comprises a rotating part and a stationary part attached to the support, with a bearing gap formed between the parts. The stationary part includes at least one pole element with an excitation winding, and the rotating part is made of at least one laminated component of a magnetizable material which is fixed on the inner side of the tubular casing. The pole element and the laminated component cooperate for guiding a magnetic flux.

Abstract: A texturing machine for producing a crimped yarn and which has a plurality of serially arranged yarn processing units leading to a takeup device. A threading device is provided for threading a yarn for the first time before the start of a process. For this purpose, the threading device comprises at least one guide tube and an air injector connected thereto, with the guide tube including a suction inlet for receiving the yarn. In accordance with the invention, a cutting device is arranged in the region of the suction inlet of the guide tube, with the cutting device cutting the yarn while being threaded into the suction inlet.

Abstract: A false twist texturing apparatus for false twist texturing a plurality of synthetic yarns in a plurality of processing stations, which each comprise a plurality of feed roll systems, a primary heater, a cooling device, a false twist unit, a secondary heater, and a takeup device. For accommodating the takeup devices, a takeup module is provided, and a processing module is provided for accommodating the false twist units, with a doffing aisle being formed along the takeup module and a servicing aisle along the processing module. To realize a short yarn path, the processing module and the takeup module are joined to form a frame section arranged between the servicing aisle and the doffing aisle. In this arrangement, the yarn passage from the processing module to the takeup module is formed by the secondary heater which is horizontally oriented, so that the yarn is guided between the false twist unit and the takeup device on the frame section along a generally U-shaped path.

Abstract: A method and apparatus for producing a high-strength and low-shrinkage synthetic flat yarn. After melt spinning, the filaments are combined to a yarn and drawn. Subsequently, the yarn is compressed to form a plug under the influence of heat. This plug is transported over a certain distance, so that the yarn relaxes in a low-tension state and under the influence of the increased temperature. Finally the plug is disentangled under tension to form the flat yarn, which is wound into a package.

Abstract: A melt spinning apparatus for spinning a synthetic yarn, wherein the yarn is formed by combining a plurality of filaments and wound to a package by means of a takeup device downstream of the spinning apparatus. Downstream of the spinneret, an inlet cylinder with a gas-permeable wall and a cooling tube are arranged. The cooling tube connects to a suction device such that an air stream forms in the cooling tube in the direction of the advancing yarn. This air stream assists the advance of the filaments and leads to a delayed cooling. To ensure adequate cooling of the filaments within the cooling zone, an air supply device is provided for generating an additional cooling air stream which flows in the axial direction of the cooling tube for cooling the filaments downstream of the inlet to the cooling tube.

Abstract: A spinning apparatus for melt spinning a synthetic multifilament yarn, which includes a spin head having a plurality of narrowly spaced apart spin packs with spinnerets, through the nozzle bores of which the filaments are extruded. Downstream of the spinnerets, the filaments advance through cooling tubes, which connect to an air stream generator that produces an air stream in the direction of the advancing yarn. The cooling tubes are mounted for movement to a lowered servicing position, and sealing units are provided for connecting the cooling tubes to the spin head when in the raised operative position. The sealing units form a separating plane arranged on the side of the spin head and a separating plane arranged on the side of the cooling tube, and the separating plane on the spin head side is located on the spin pack. A very compact arrangement of the spin head and the cooling tubes is thereby enabled.

Abstract: A method and an apparatus for stuffer box crimping a multifilament yarn, wherein the yarn is conveyed into a crimping device in two steps. In the first step, the yarn is taken in by a conveying fluid stream of a first feed nozzle at a yarn intake speed. In the second step the yarn is advanced by a conveying fluid stream of a second feed nozzle at a second yarn conveying speed into the crimping device. In this process, the second yarn conveying speed is at least the same as or greater than the intake speed.

Abstract: A yarn false twist texturing machine for texturing multifilament synthetic yarns (4), wherein a heating device and a false twist unit are arranged within a false twist zone. An aftertreatment zone accommodates a second heating device and a countertwist device. The countertwist device is used to remove any residual twist that is left in the yarn by the false twist unit. To be able to perform a selective treatment by the countertwist device, a first embodiment provides for a twist imparting member yarn guide means for guiding the yarn (4) and being adapted for reciprocal movement between an idle position for not treating the yarn (4) or for threading it and an operating position for treating the yarn (4). In a second embodiment, the countertwist device comprises a movable twist imparting member (28, 29), which is adapted for reciprocal movement between an idle position for not treating or for threading the yarn (4) and an operating position for treating the yarn (4) by twisting it.

Abstract: A texturing machine for crimping an advancing yarn and which includes a plurality of processing units and a plurality of feed systems. At least one of the feed systems is formed by a driven feed roll and a rotatable guide roll mounted in cantilever fashion on a machine frame, and about which the yarn is looped. A threading device is associated with the rolls for an initial threadup of the yarn before the start of the process, and by which it is possible to lay the advancing yarn against the circumference of the rolls with a total looping greater than 360°.

Abstract: An apparatus and method for spinning a synthetic yarn, wherein a heated polymeric melt is extruded through a spinneret and the resulting filaments are combined and wound to a package by means of a take-up device located downstream of the spinneret. A cooling tube for the filaments is positioned below the spinneret, and an inlet cylinder which has a gas permeable wall is positioned between the inlet cylinder and the cooling tube. The cooling tube connects to an air stream generator in such a manner that an air stream develops in the cooling tube in the direction of the advancing yarn. The air stream is formed by a quantity of air that enters the cooling tube via the inlet cylinder, and the inlet cylinder is subdivided in the direction of the advancing yarn into several zones, each with a different gas permeability, for controlling the quantity of air entering the inlet cylinder. It is thereby possible to influence with advantage the precooling of the yarn and the formation of the air stream.

Abstract: A method and an apparatus for melt spinning a multifilament yarn from a thermoplastic material, wherein a spinneret extrudes the thermoplastic material to strandlike filaments, which are initially in liquid form and then cooled to cause their solidification. For purposes of cooling, the filaments are precooled in a cooling zone downstream of the spinneret in such a manner that the filaments do not solidify. Subsequently, the filament bundle advances by the action of a coolant stream directed in the direction of the advancing yarn into a tension zone and undergoes further cooling until the filaments solidify in a solidification zone within the tension zone. To maintain the location of the solidification zone within the tension zone in a predetermined desired range thereof, an adjustable cooling of the filaments within the cooling zone is provided.

Abstract: An apparatus and method for applying a lubricant to an advancing yarn, to facilitate the further processing of the yarn, and wherein the lubricant is composed of a plurality of components such as an emulsion of water and oil. The apparatus includes separate containers for the components of the lubricant, and a feed device for combining and mixing the components in a mixing chamber. The feed device also includes a pump for delivering the resulting lubricant to a wetting device which applies a metered quantity of the lubricant to the yarn. Provision is also made for maintaining a desired mixing ratio of the components of the lubricant.

Abstract: A method and an apparatus for continuously unwinding a yarn from a yarn package which may be associated with a method and apparatus for texturing the withdrawn yarn. The yarn is withdrawn from a feed yarn package supported in a creel, and the trailing yarn end of the feed yarn package connects to a leading yarn end of a second feed yarn package (reserve package) by a knot-type piecing to achieve a continuous advance of the yarn for its treatment or processing. A sensor is provided which detects and signals the yarn change from the feed yarn package to the reserve package after the feed yarn package is unwound, and the signal may be used to control the texturing process.

Abstract: A method and apparatus for controlling a machine for false twist texturing a plurality of synthetic filament yarns and which includes a plurality of side by side processing stations. The plurality of processing stations are divided into a plurality of sections, with each section comprising a plurality of processing stations. The processing stations of each of the sections are monitored and controlled independently of the processing stations of adjacent sections, so that the processing of the yarns in each section is independent of the processing of the yarns in adjacent sections.

Abstract: A method and apparatus for winding a continuously advancing yarn, wherein the yarn is wound on a driven tube to a cross wound package. The yarn is reciprocated by means of a traversing yarn guide within a traverse stroke which is variable in its length within the package width of the cross wound package. During the winding cycle, the traverse stroke is varied between a maximum length at the beginning of the winding cycle and an end length at the end of the winding cycle by a predetermined stroke function in such a manner that in the course of the winding cycle, a certain length is associated to each traverse stroke, with the lengths of the traverse strokes being smaller than the respective wound package widths then being formed.

Abstract: A yarn winding machine for winding at least one yarn and a method of controlling such a winding machine. In the winding machine, a plurality of rotatably driven components are used, whose drives are controlled via a controller. A data module is associated to at least one of the components, with the data module being writable and/or readable by the controller.

Abstract: A spinning apparatus for melt spinning a synthetic multifilament yarn, which includes a spin head having a plurality of narrowly spaced apart spin packs with spinnerets, through the nozzle bores of which the filaments are extruded. Downstream of the spinnerets, the filaments advance through cooling tubes, which connect to an air stream generator that produces an air stream in the direction of the advancing yarn. The cooling tubes are mounted for movement to a lowered servicing position, and sealing units are provided for connecting the cooling tubes to the spin head when in the raised operative position. The sealing units form a separating plane arranged on the side of the spin head and a separating plane arranged on the side of the cooling tube, and the separating plane on the spin head side is located on the spin pack. A very compact arrangement of the spin head and the cooling tubes is thereby enabled.

Abstract: A yarn texturing machine for texturing a plurality of thermoplastic yarns, each in a processing station. The yarns are guided and advanced in each processing station by a plurality of feed systems. One of the feed systems comprises a driven feed roll which is partially looped by the advancing yarn, and a guide member mounted for movement relative to the feed roll for movement between a threading position wherein the yarn is separated from the feed roll and an operating position wherein the yarn engages the feed roll.

Abstract: The invention relates to a spinning line for producing a plurality of endless synthetic filament yarns. The spinning line comprises a spinning apparatus for melt spinning the yarns and a takeup apparatus for winding the yarns. Between the spinning apparatus and the takeup apparatus, a yarn collection device is arranged which cuts and removes the yarns by suction upon occurrence of a disturbance in the yarn path of at least one yarn. To this end, the yarn collection device comprises a movable yarn guide with a yarn guide groove in the yarn advance plane, a cutting device, and a suction device. The cutting device and suction device are arranged in the yarn advance plane on one side of the yarn web. The yarn guide is arranged on the opposite side of the yarn web and moved in direction of the cutting device for cutting the yarns.