Abstract: A sliver can for accommodating a strand-shaped fiber material includes a can base and a peripheral side wall that delimits an accommodating space for the fiber material, the peripheral side wall at least partially transparent. A display element that transmits a signal indicating one or both of a quantity or a property of the fiber material is located in the sliver can and is configured within the sliver can such that the signal is visible through the peripheral side wall from outside the accommodating space. The invention also encompasses a sliver can base configured with the display element and a spinning mill machine in combination with the sliver can.

Abstract: A sliver guide for guiding a plurality of textile slivers in an entry region of a drawing frame, includes a first guide portion for guiding a first group of textile slivers, and a second guide portion for separately guiding a second group of textile slivers. In a side view of the sliver guide, the first guide portion and the second guide portion are spaced apart from one another. The sliver guide has a third guide portion spaced apart from the first guide portion and from the second guide portion. To at least one of the guide portions, lateral guide elements for laterally guiding textile slivers are assigned, wherein the mutual distance of the guide elements can be adjusted.

Abstract: Provided is an electro-spinning type pattern forming apparatus. The electro-spinning type pattern forming apparatus includes a nozzle, a stage, and a fiber guide part. The nozzle has a first voltage applied thereto and spins a spinning solution. The stage is disposed below the nozzle to support a substrate on which a pattern is to be formed and has a second voltage applied thereto. The fiber guide part is disposed between the nozzle and the stage, and transforms the electric field formed between the nozzle and the stage to apply a force, acting in a direction parallel to the stage, to nano-fibers spun from the nozzle. The electro-spinning type pattern forming apparatus can form a nano-fiber pattern arranged in one direction.

Abstract: A method for ring-spinning with pneumatic guiding and capturing includes steps of: respectively fixing a pneumatic guiding and capturing apparatus in front of each drawing system of a ring frame; twisting the ribbon-like strand outputted through a front roller nip to form a spinning strand, moving the spinning strand into a holder groove of a capturing holder; guiding ribbon-like strand edge fibers to closely contact with a spinning strand main body by negative pressure airflow in the holder groove; before the ribbon-like strand edge fibers enter an in-take opening, cohering the edge fibers with the spinning strand for being partly captured by the spinning strand stem; other un-captured edge fibers become spinning strand hairiness, which is then stretched and tightly wrapped onto the spinning strand stem by a negative pressure; the spinning strand is outputted from the holder groove outlet to get a high qualified spun yarn.

Abstract: An electric drive axle arrangement for a road vehicle comprises an electric drive motor (1), a differential mechanism (3, 4) for allowing different velocities of drive wheels driven by the drive motor, and a torque vectoring system (2, 6, 7) for controlling the distribution of drive torque between the two drive wheels. A torque vectoring motor (2) of the torque vectoring system is of the non-permanent magnet motor type.

Abstract: Described herein an apparatus and methods used to remove unwanted by-products of metathesis reactions.

Abstract: A device for compacting a fiber composite on a spinning machine includes consecutive drafting arrangement roller pairs. A compaction unit is pivotably mounted on the machine frame downstream of the delivery roller pairs with a pivot axis parallel to the rotational axes of the delivery roller pair, and includes a support with a suction drum rotatably supported on the support. At the end of a suction zone of the drum, a nip roller is fastened to the support to form a nip line. The support is spring-loaded to form a drive connection between the lower roller of the delivery roller pair and the suction drum, wherein the suction drum is moved against the lower roller. Guide means fix the compaction unit in position as mounted on the machine frame, and the spring element is mounted on the free end of the pressure lever.

Abstract: A compacting unit for compacting a fiber composite supplied by a drafting unit of a spinning machine has a beam on which at least one suction drum equipped with a suction zone is rotatably mounted on an axle. A clamping roller mounted on the beam is in contact with the suction drum to form a clamping line at the end of the suction zone under the action of a pressure element mounted on the beam. The clamping roller is mounted so it is rotationally movable on a pressure arm that is equipped with a spring element and is mounted on the beam so it can pivot over a pivot axis.

Abstract: Methods for making yarns are provided which include the steps of supplying continuous polymer filaments, detaching from at least a part of the continuous polymer filaments, and at least one continuous reinforcement filament, a plurality of discontinuous polymer fibers and of discontinuous reinforcement fibers to obtain a composite sliver, and twisting the composite sliver to obtain a roving from which yarn may be obtained. Yarns produced by such methods as well as textiles, fabrics and garments which include such yarns are also provided. Such yarns may be particularly useful in the production of, for example, protective gloves.

Abstract: The present invention relates to the production of textiles and more particularly pertains to a method for manufacturing cotton towels comprising the steps of: combining a yarn of 120S combed long staple cotton and a yarn of 10S combed long staple cotton by means of a double winder and winding onto a bobbin or bobbins after combining; feeding the bobbin or bobbins of the combined yarn into a double twister for plying; winding the plied yarn onto a bobbin and weaving into greige; impregnating the greige in the solution of a combined desizing, scouring and bleaching machine to be soaked and steamed for removing the sizes and the impurities in the cotton yarn; treating the greige by means of deoxidization, dyeing, enzymatic desizing, softening, relaxation drying and sewing into towels. The present invention adopts the 120S combed long staple cotton for plying which achieves a definitive binding effect on the loosened fibers on the surfaces of the yarn, thereby forming fewer fluffs on the surfaces of the towel.

Abstract: A pitch-based carbon fiber sliver providing a high-strength carbon fiber spun yarn is efficiently produced by providing a pitch-based carbon fiber mat comprising a mass of piled-up pitch-based carbon fibers of which fiber extension directions are aligned preferentially in one direction; and directly subjecting the carbon fiber mat to drawing and carding by means of a carding machine while moving the mat in said one preferential alignment direction. The thus-obtained carbon fiber sliver is drawn and twisted to produce a pitch-based carbon fiber spun yarn containing at least 3 wt. % of fibers having a fiber length of at least 150 mm, a number of primary twist of 50-400 turns/m and a tensile strength of at least 0.10 N/tex.

Abstract: In the case of an apparatus for a sliver-forming textile machine, especially a draw frame, flat card or the like, a fiber structure (fiber web) coming from the delivery rollers of a drafting system passes through a web guide and a sliver funnel with take-off rollers, the web guide has an inner wall (deflection and/or guide face), and a frictional resistance offered by the inner wall acts on the fiber structure. In order to allow in a simple manner an improved web guidance and sliver quality, and to permit the web guide to be adapted to different technical parameters, such as fiber material properties, working speed, a parameter relating to contact between fiber structure and inner wall is alterable.

Abstract: In a sliver conveying and depositing device, the sliver is guided from the carder through a draw frame to a can coiler. A first deflection device mounted on the free end of a pivotable arm is arranged between the last driven roller pair of the draw frame and the can coiler. The sliver is guided across the first deflection device and the arm exerts a counter pressure onto the sliver for maintaining sliver tension. The first deflection device is displaceable for compensating the sliver length between first and second end positions, wherein signal transducers emit a signal when the first or second positions are reached. The speed of the can coiler drive is changed when a signal is received from the signal transducers, wherein a time interval elapsed since the last signal has been received from one of the signal transducers is taken into account for changing the speed.

Abstract: An apparatus (20) and methods are provided for splicing selected portions of sliver (S) such as during yarn formation and processing. The apparatus (20) preferably includes a needle carrying member (35) having a plurality of needles (32) to engage silver (S) when positioned adjacent thereto and a needle engaging member (45) positioned to underlie the needle carrying member (35) and to receive the plurality of needles (32) from the first needle carrying member (35).

Abstract: Different improvements of a spinning preparation machine are proposed to measure the fiber sliver thickness or the fiber sliver cross-section of at least one fiber sliver by means of one or several microwave sensors. One improvement is characterized by compressing means and special mechanical guiding elements that can be installed before, after and/or in the microwave sensor. It is also proposed to install a pair of conveyor rollers after a microwave sensor that can be designed in particular as an input roller pair of the subsequent drafting equipment. Furthermore, proposals are made for the calibration of the (at least one) microwave sensor.

Abstract: A method of strengthening a conveyable fiber lap in an endlessly circulating conveying device is provided. The method includes conveying the fiber lap using first and second converging rollers, each roller having an outer surface, at least the first roller being provided with profile elements on its outer surface, the profile elements being non-continuous in an axial direction of the first roller; subjecting the fiber lap to a pressure when the fiber lap passes through a gap between the first and second rollers; and strengthening the fiber lap by exerting the pressure by the converging rollers and the profile elements.

Abstract: A coiler plate is provided for sliver coil depositing. The coiler plate has a rotational axis, a spatially curved sliver channel having a wall, an inside wall surface, a sliver inlet, and a sliver outlet. The sliver inlet is arranged substantially coaxial with the rotational axis, and the sliver outlet is arranged at a radial distance and an axial distance from the sliver inlet. The device has a field producer that produces at least one of a magnetic field and an electric field. The field is for acting on the sliver such that the sliver is positioned away from at least a portion of the sliver channel inside wall surface.

Abstract: A fiber processing machine includes an arrangement for producing a running fiber web having a width extending perpendicularly to the running direction; a roll unit having a roll axis and a roll surface engaging the running web; a web guiding element disposed downstream of the roll unit for laterally gathering the web for reducing the width thereof; and a web trumpet disposed downstream of the web guiding element. The web trumpet has an outlet opening for discharging the running web. The outlet opening has an outlet height and an outlet width greater than the outlet height. The outlet width is oriented to the roll axis at an angle other than zero for reorienting the width of the web during run thereof from the roll unit to the outlet opening. A calender roll pair is disposed downstream of the web trumpet.

Abstract: A carding machine includes a main carding cylinder and a doffer to which fiber material is transferred from the main carding cylinder and a fiber removing device positioned downstream of the doffer as viewed in an advancing direction of the fiber material through the carding machine. A gathering device including at least one gathering roll is disposed downstream of the doffer for effecting a negative draft on the fiber material between the doffer and the gathering roll.

Abstract: A coiler plate is provided for sliver coil depositing. The coiler plate has a rotational axis, a spatially curved sliver channel having a wall, an inside wall surface, a sliver inlet, a sliver outlet, and a plurality of air inlets in the sliver channel wall for introducing air into the sliver channel. The sliver inlet is arranged substantially coaxial with the rotational axis, and the sliver outlet is arranged at a radial distance and an axial distance from the sliver inlet. The sliver is subject to a tensioning draft, and the air introduced into the sliver channel is for acting on the sliver to reduce a frictional force between the sliver and the inside wall surface of the sliver channel.

Abstract: A condensing unit for condensing a bundle of textile fibers comprises a fixed tube of circular cross-section, which is common to several spinning stations located side by side, is connected to a suction source, and has a suction slot in each station. Filtering sleeves are mounted so as to be freely rotatable on the tube and have perforated portions which cover the corresponding slots. The tube has, in each spinning station, a recess which extends along an arc of the circumference of the tube. This recess has a pair of axially spaced-apart radial surfaces which cooperate with the sleeve in order to keep it in the correct axial position along the tube with the perforated portion over the slot.

Abstract: A fixed tube of circular cross-section, which is common to several-spinning stations located side by side, is connected to a suction source and has, in each station, a suction slot which is located on the path of the bundle of fibres and is elongate along the direction of movement thereof. Each slot is enlarged in its portion which is located downstream, with reference to the direction of movement of the bundle of fibres.

Abstract: A fixed tube of circular cross-section, which is common to several spinning stations located side by side, is connected to a suction source and has, in each station, a suction slot which is located on the path of the bundle of fibers to be condensed and is elongate along the direction of movement thereof. In each spinning station, the tube has a second suction opening located proximate to each suction slot.

Abstract: A fiber sliver producing apparatus includes an arrangement for making a running fiber web and a web gathering device which has a plurality of walls defining an inner space through which the fiber web runs in an advancing direction. The walls are stationary during operation of the apparatus. The web gathering device has a web gathering portion causing the running fiber web to converge and a web densifying portion, situated downstream of the web gathering portion as viewed in the advancing direction, for forming a running sliver from the web. The web densifying portion has an outlet opening of cross-sectionally rectangular outline and an opening width which is at least five times greater than the opening height. Upon discharge through the outlet opening, the sliver passes through cooperating rolls of a calender roll pair defining a bight in which the outlet opening of the web gathering device is disposed.

Abstract: The method and an apparatus provide for the automatic provision and transfer of a reserve lap (WR) from a reserve position (RP) to a working position (AP) in a machine (K1 to K3) for processing wound laps and for the automatic discharge of an empty tube (H) from the working position (AP). The conveying system (K, 4) is provided to convey wound laps (W) or empty tubes (H) individually or in groups between a lap-processing (K1 to K3) and a lap-forming machine (KV). The control unit (8) of the conveying system (K, 4) is connected with a central control unit (ST) which is connected with the control unit (21, 22, 23) of the respective lap-processing machine (K1 to K3), with a conveyor (T) in the lap-forming machine (Ky), as well as with the control unit (20) of the lap-forming machine (Ky), and a transfer device (58, 60, 61, 63) which can be controlled via the control unit (21,22,23) of the respective lap-processing machine (K1 to K3).

Abstract: In order to transport a fiber strand to be pneumatically condensed over a suction slit of a condensing zone of a spinning machine, a transport belt is provided which comprises, at least in the effective area of the suction slit, a porous area. The porous area can, for example, be created by dissolving granulate components from a fine-grained granulate blend.

Abstract: A top making apparatus is attached to a woolen card. Materials usually to be processed on a woolen card are fed and the delivered web is guided by the top making apparatus and ball tops are formed by the top making apparatus. This top is processed on cotton spinning system. Finer and even yarn can be spun with the top.

Abstract: A method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver includes the following steps: Obtaining at least three measured values of a quality-characterizing magnitude, such as the CV value, of the drafted sliver; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre-operational run of the draw unit; and numerically computing a function between the quality-characterizing magnitudes and application points of regulation from the measured values.

Abstract: A draw frame includes a transport roll pair for simultaneously guiding a plurality of slivers running in an advancing direction; and a series of drafting roll pairs spaced from one another in the advancing direction. One of the drafting roll pairs is a first drafting roll pair as viewed in the advancing direction. The first drafting roll pair is positioned downstream of the transport roll pair. A measuring device is contacted by the running slivers and includes a pressure-sensitive member exposed to a force derived from the running slivers for emitting a signal representing the force; and a deflecting arrangement for deflecting the running slivers for causing them to be partially trained about the deflecting arrangement to exert on the pressure-sensitive member a pressing force proportional to a tension of the slivers prevailing upstream and downstream of the pressure-sensitive member.

Abstract: An apparatus for introducing a plurality of slivers simultaneously to a sliver processing machine includes an arrangement for withdrawing the slivers from coiler cans; a creel; a plurality of supply rolls mounted on the creel and contacting the slivers; a drive, having at least one drive motor, for rotating each supply roll; a common converter connected to the drive; and an rpm setter for setting rpm's of the drive such that the drive has an rpm essentially corresponding to a desired rpm.

Abstract: A method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver, includes the following steps: obtaining a plurality of measured values of a quality-characterizing magnitude, such as a CV value, of the drafted sliver portion; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre-operational run of the draw unit; obtaining several measured values of a quality-characterizing magnitude based on an un-drafted sliver portion and determining the function between the quality-characterizing magnitudes and application points of regulation from measured values at the un-drafted sliver portion and at the drafted sliver portion.

Abstract: A top roller unit is arranged on a top weighting arm for a drafting apparatus of a spinning machine, which top roller unit has a holding device and two double top rollers and is arranged at two adjacent spinning stations. A first top roller of a spinning station borders a drafting zone which serves to draft a fiber strand, and a second top roller of a spinning station borders a condensing zone which serves to condense the fiber strand and which is arranged downstream of the drafting zone. The second top roller of each spinning station is driven via a drive by the first top roller, which drive takes the form of an intermediate gear which is common to all the top rollers of the top roller unit. The top roller unit is supported by a housing which encapsulates the intermediate gear.

Abstract: An air-permeable transport belt, drivable by a drive roller, is provided for transporting a fiber strand to be condensed over a sliding surface of a spinning machine condensing zone which includes a suction slit. The transport belt has at least one area arranged to contact the drive roller, which area differs in relation to its surface structure from an area arranged to contact the sliding surface and from an area arranged to contact the fiber strand.

Abstract: A fleece funnel is provided which is placed at a predetermined distance behind the output rolls of the stretch works of a textile machine, particularly a carding machine. The longitudinal side of the funnel is laterally closed by a baffle plate. The baffle plate borders a bulged impact plates, which, at the deepest part of the bulge possess an outlet opening for the reception of a funnel duct. The impact plates form an intersection line with a ramp located oppositely to the baffle plate. On the impact plate from any optional point of the intersection line, a decline is defined to the exit-opening of the funnel.

Abstract: A fiber sliver producing apparatus includes an arrangement for making a running fiber web and a web gathering device which has a plurality of walls defining an inner space through which the fiber web runs in an advancing direction. The walls are stationary during operation of the apparatus. The web gathering device has a web gathering portion causing the running fiber web to converge and a web densifying portion, situated downstream of the web gathering portion as viewed in the advancing direction, for forming a running sliver from the web. The web densifying portion has an outlet opening of cross-sectionally rectangular outline and an opening width which is at least five times greater than the opening height. Upon discharge through the outlet opening, the sliver passes through cooperating rolls of a calender roll pair defining a bight in which the outlet opening of the web gathering device is disposed.

Abstract: A machine (28, 201, K, 400) for processing textile material with at least one sliver-forming device (209, 41) and a coiler (42, KA) is provided with a drafting arrangement (2, 110, 213) in such a way that at least the coiler (42, KA) is formed by a subassembly of a draw frame (1, S) for doubling and drafting slivers (40, F, 52, 120), with the subassembly (1, S) also comprising the drafting arrangement (2, 213) of the draw frame.

Abstract: A draw frame includes a transport roll pair for simultaneously guiding a plurality of slivers running in an advancing direction; and a series of drafting roll pairs spaced from one another in the advancing direction. One of the drafting roll pairs is a first drafting roll pair as viewed in the advancing direction. The first drafting roll pair is positioned downstream of the transport roll pair. A measuring device is contacted by the running slivers and includes a pressure-sensitive member exposed to a force derived from the running slivers for emitting a signal representing the force; and a deflecting arrangement for deflecting the running slivers for causing them to be partially trained about the deflecting arrangement to exert on the pressure-sensitive member a pressing force proportional to a tension of the slivers prevailing upstream and downstream of the pressure-sensitive member.

Abstract: An apparatus for lengthening, to a determined extent, a free sliver end portion hanging on an exterior face and from an upper edge of a can containing sliver deposited in coils, includes a device for grasping and firmly holding the free sliver end portion; and an arrangement for moving the grasping device and the can away from one another for pulling an additional length of sliver from the can to lengthen the free sliver end portion.

Abstract: A method for making a pure buffalo yarn is disclosed and includes the steps of, scouring a buffalo fleece with detergent and water at a temperature of at least 80 degrees centigrade to clean the fleece, dehairing the buffalo fleece to remove unwanted course hair from the fleece to produce dehaired fine soft fibers, blending the dehaired fine soft fibers with an oil and water emulsion in a mixing picker to produce a mixed fiber, carding the mixed fiber at 50 weight percent of normal to produce a roving of straight and parallel fibers, spinning the roving to produce a yarn and twisting the yarn to increase the bulk and softness of the yarn.

Abstract: A fiber processing machine includes an arrangement for producing a running fiber web having a width extending perpendicularly to the running direction; a roll unit having a roll axis and a roll surface engaging the running web; a web guiding element disposed downstream of the roll unit for laterally gathering the web for reducing the width thereof; and a web trumpet disposed downstream of the web guiding element. The web trumpet has an outlet opening for discharging the running web. The outlet opening has an outlet height and an outlet width greater than the outlet height. The outlet width is oriented to the roll axis at an angle other than zero for reorienting the width of the web during run thereof from the roll unit to the outlet opening. A calender roll pair is disposed downstream of the web trumpet.

Abstract: An apparatus for lengthening, to a determined extent, a free sliver end portion hanging on an exterior face and from an upper edge of a can containing sliver deposited in coils, includes a device for grasping and firmly holding the free sliver end portion; and an arrangement for moving the grasping device and the can away from one another for pulling an additional length of sliver from the can to lengthen the free sliver end portion.

Abstract: A method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver includes the following steps: Obtaining at least three measured values of a quality-characterizing magnitude, such as the CV value, of the drafted sliver; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre-operational run of the draw unit; and numerically computing a function between the quality-characterizing magnitudes and application points of regulation from the measured values.

Abstract: A method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver, includes the following steps: obtaining a plurality of measured values of a quality-characterizing magnitude, such as a CV value, of the drafted sliver portion; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre-operational run of the draw unit; obtaining several measured values of a quality-characterizing magnitude based on an un-drafted sliver portion and determining the function between the quality-characterizing magnitudes and application points of regulation from measured values at the un-drafted sliver portion and at the drafted sliver portion.

Abstract: A fixed tube of circular cross-section, which is common to several spinning stations disposed side by side, is connected to a suction source and has, in each station, a suction slot arranged on the path of a bundle of fibres to be compacted and along its direction of advance. A cylindrical sleeve is freely rotatable on the tube and has a perforated portion which extends around a corresponding slot. The sleeve is rotated about the fixed tube by a pressure roller which presses the bundle of fibres against the perforated portion of the sleeve. The sleeve cooperates with an axially stationary retaining element which is separate from the tube and is arranged to limit the axial movements of the sleeve along the tube.

Abstract: A coiler can for accommodating sliver includes a vertical wall defining an inner can space and a can top through which sliver may be deposited into and withdrawn from the can space; a vertically shiftable bottom disposed in the inner can space; and a tension device connected to the shiftable bottom and exerting a pulling force thereto toward the can top.

Abstract: A fiber sliver producing apparatus includes an arrangement for making a running fiber web; a transverse web gathering device gathering the fiber web; and a sliver trumpet through which the gathered fiber web passes for being densified and discharged thereby as a running sliver. The sliver trumpet has a cross-sectionally rectangular outlet opening which has a width that is at least 10 times greater than its height. The apparatus further has a calender roll pair formed of two calender rolls through which the sliver passes after being discharged by the sliver trumpet. The calender roll pair defines a bight in which the outlet opening of the sliver trumpet is disposed.

Abstract: Downstream of a drafting unit of a spinning machine, a condensing zone is provided, in which a drafted fiber strand still in an untwisted state is condensed by bundling. The condensing zone comprises a stationary suction slit, over which the fiber strand to be condensed is transported by an air-permeable transporting element. The suction slit defines the direction of a suction air stream by a guiding edge, which extends diagonally to the direction of motion of the transport element. The air stream positions the fibers of the fiber strand diagonally to the direction of motion of the transport element and so condenses the fiber strand. The suction slit begins with a starting width, which seizes the fiber strand to be condensed in its entire width. Directly downstream thereof the suction slit graduates in the form of a delta into a narrower effective width. The guiding edge continues an edge of the delta without deformation.

Abstract: A condensing zone for condensing a drafted fiber strand is arranged downstream of the front roller pair of a drafting apparatus of a ring spinning machine. The condensing zone includes a stationary sliding surface having a suction slit, over which the fiber strand is transported by a perforated transport belt. The condensing zone is bordered on its exit side by a nipping roller which is disposed on the transport belt. The nipping roller drives the transport belt and is in turn driven by a friction roller. The friction roller is pressed, by means of a loading spring, onto the nipping roller as well as onto a roller of the front roller pair of the drafting apparatus.

Abstract: This invention relates to a method and apparatus for loading sliver onto a sliver tray placed in a designated location in a semi-truncated conical shape without using spindles. This invention enables sliver S spun out of a coiler system C to be accommodated in a semi-truncated conical shape and loaded onto the sliver tray T, which was already placed in a designated location. The device enables the accommodation of sliver S to be formed in a semi-truncated conical shape capable of standing independently and without requiring the use of spindles. The coiler system C has been removed from the drawing frame 11 so that the device is able to move in three directions X, Y, Z either front/rear, left/right, and upward/downward. These three directions can cross one another at right angles.

Abstract: A fixed tube of circular cross-section, which is common to several spinning stations disposed side by side, is connected to a suction source and has, in each station, a suction slot arranged on the path of a bundle of fibers to be compacted and along its direction of advance. A cylindrical sleeve is freely rotatable on the tube and has a perforated portion which extends around a corresponding slot. The sleeve is rotated about the fixed tube by a pressure roller which presses the bundle of fibers against the perforated portion of the sleeve. The sleeve cooperates with an axially stationary retaining element which is separate from the tube and is arranged to limit the axial movements of the sleeve along the tube.