FR2651806A1 - METHOD AND DEVICE FOR CENTRIFUGAL SPINNING OF AT LEAST ONE TEXTILE YARN AND AN INSTALLATION COMPRISING SAID DEVICE - Google Patents

Abstract

The invention relates to a method and a device for centrifugal drying of at least one textile yarn impregnated with a liquid, avoiding the problems inherent in the centrifugal dewatering of spools of yarn, in particular after a dyeing operation, as well as installation comprising this device. The wire (1) is scrolled continuously in an axial duct (3) of a rotating tubular element (10), and an off-center path (1 ') is imposed on the wire, by means of a guide hole (42). Preferably, this orifice (42) has a first centered position, to allow introduction of the wire (1) by means of an axial air stream. Then the orifice is moved by the effect of centrifugal force to a position (42 ') remote from the axis of rotation (4). Application to the dewatering of textile threads which have been impregnated with a liquid, in particular a dyeing solution.

Description

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  The present invention relates to a centrifugal spinning process of at least one textile thread impregnated with a liquid, in particular a solution of

dye exhausted or not.

  The invention also relates to a device for centrifugally spinning at least one continuously drawn textile yarn, for the implementation of this method.

  method, and an installation comprising this device.

  A known technique for centrifugally spinning a textile yarn, impregnated with a liquid, in particular between a thread bobbin dyeing operation and a drying operation of this yarn, consists in centrifuging the yarn packages on spinning centrifugal spinning machines. speed. This centrifugation technique has various disadvantages. First of all it requires special machines, relatively heavy and expensive. The reels must be manipulated several times, from dyeing to centrifugation, then from centrifugation to drying, then to reeling. Finally, there are troublesome phenomena of differential migration of the dyes inside the coil, so that the wire is not dyed in a manner

uniform.

  To avoid these drawbacks, there are continuous spinning processes, for example pneumatic spinning textile son that is passed through a small conduit in which at the same time injected compressed air. However, this requires a very large amount of compressed air, often making the process unusable economically. In addition, this spin has a primarily superficial effect and often leaves color differences between the core and the outside of the wire. On the other hand, processes using centrifugation have the advantage of ensuring a substantially uniform wringing in any

the thickness of the wire.

  This is why the present invention aims to provide a method and a device for continuously spinning one or more textile threads.

by centrifugation.

  For this purpose, the method according to the invention is characterized in that the wire is passed continuously along a path passing through a rotary guide means about an axis, and in that the guide means is rotated so as to keep the wire away from the axis of rotation and thereby subject it to centrifugation on a portion of

his journey.

  Preferably, the method may comprise an initial pneumatic threading step, into which an end of the thread is introduced into the guide means from an axial lead for feeding the thread, by means of

  of an air jet in this axial duct.

  The guiding means may advantageously comprise a movable orifice which is maintained, during the initial threading step, in a first position close to the axis of rotation, and which is then placed in a second remote position. of the axis to perform the centrifugation continuously. The movable orifice can be brought into its second position by

a centrifugal force effect.

  The movable orifice may be part of a rotatable member, and said rotary member may be rotated at a first speed, lower than a predetermined limit speed, during the initial threading step, and then at a second higher speed. at this limiting speed during centrifugation. In such a process, it is possible to scroll together several

son along said path.

  The device according to the invention is characterized in that it comprises a rotatable element about an axis, traversed longitudinally by a wire and coupled to means for driving in rotation, and in that this rotary element comprises a section of tubular inlet duct of the wire -3- and a section of tubular conduit output of the wire, these two sections being centered on the axis, and at least one guide orifice disposed on the path of the wire between these two sections and arranged to keep the thread at

  distance from the axis of rotation on part of its course.

  According to a particularly advantageous embodiment, the rotary element comprises an axial tubular conduit comprising said input and output sections of the wire, as well as an intermediate section provided with a lateral opening, and the device comprises pneumatic means of threading the wire into the rotary member by injecting air into the axial tubular conduit. Said pneumatic threading means may advantageously comprise a stationary tubular element centered on the axis of rotation and placed upstream of the rotary element on the course of the wire, said stationary element being provided with means

  injection of compressed air towards the axial tubular conduit.

  According to a preferred embodiment, the rotary element comprises a disc centered on the axis of rotation and provided with at least one opening having an end close to the axis and extending to near

from the periphery of the disc.

  In an advantageous embodiment, the guide orifice may be defined by a movable part mounted on the rotary element, this orifice having a first position close to the axis and at least one

  second position away from the axis.

  A particular embodiment provides that in said first position, the guide orifice is in said intermediate portion of the axial duct, and that said movable piece has a cover covering said lateral opening in this first position, so

  to facilitate pneumatic threading.

  Said moving part is a pivoting arm mounted on the disk and biased by a spring towards the first position of the guide orifice, this arm being arranged to pivot to the second position of said orifice under the effect of the force centrifugal, against the force of the spring. Preferably, the second position of the guide orifice is defined by an adjustable stop mounted on the disc and cooperating with the

swivel arm.

  Said spring is preferably prestressed so as to apply to the pivoting arm, in the first position of the guide orifice, a centripetal force which holds the arm in this position at a first speed of rotation lower than a given speed beyond which the arm pivots outward under the effect of the centrifugal force and submits

the wire to the centrifugation.

  Preferably, the balancing arm is pivotally mounted on the disk and connected to the pivoting arm by a mechanism synchronizing the movements of the two arms so that their respective masses are

  balanced with respect to the axis of rotation.

  The guide orifice may be formed by said opening of the disc, this opening having a first end located near the axis of rotation and corresponding to a wire threading position, and a second end located near the periphery. of the disc and

  corresponding to a centrifugation position of the wire.

  The installation comprising the centrifugal spin-drying device according to the invention is characterized by a rotating head continuously depositing the wire in the form of turns on conveying means, and a housing of

  continuously drying, traversed by said conveying means.

  Preferably, the rotary head is coaxial and integral in rotation with the rotary element of the mechanical dewatering device, this head containing an oblique duct for the passage of the wire of said duct.

  tubular axial to an outlet located at a distance from the axis.

  The present invention and its advantages will become more apparent in the

  following description of various embodiments presented as

  non-limiting examples and with reference to the accompanying drawings, in which Figure 1 is a schematic longitudinal sectional view showing an embodiment of a continuous centrifugal spin drying device according to the invention, combined with a rotating head depositing the continuous wire in the form of coils sliding along a guide, Figure 2 is a schematic cross-sectional view along arrow II of Figure 1, - Figure 3 is a view similar to Figure 2, showing in a more detailed manner a slightly different embodiment, - Figure 4 is a side view along arrow IV of Figure 3, and - Figure 5 is a view similar to Figure 2, showing

  schematically another embodiment.

  The device illustrated in Figures 1 and 2 is arranged to continuously spin a textile thread 1 unwound from a reel 2 having dyed, or simultaneously several son unwound in parallel of several respective coils. The device comprises an axial duct 3 centered on a rectilinear axis 4 and formed by several successive tubular elements traversed by the wire I. A first tubular element 5 is stationary and has oblique air injection holes 6, connected to a source compressed air 7 via a valve 8, to create in the duct 3 a stream of air in the direction of the arrow A in a

  initial step of introducing the wire into the conduit.

  Beyond a seal 9 located at the end of the element 5, the tubular elements defining the duct 3 are rotatable about the axis 4. A second tubular element 10 is supported in a frame (not shown) by a ball bearing and is rotated by a mechanism

  suitable, schematically illustrated by a belt transmission 12.

  The element 10 is provided with a lateral opening in the form of a longitudinal slot 13, so that in this element, the axial duct 3 comprises three different successive sections, namely a section-6 of inlet 3a closed on its periphery, an intermediate section 3b open

  laterally and an outlet section 3c closed around its periphery.

  In the region of the section 3b, the element 10 comprises a circular disk 14 having a V-notch 15 facing the opening 13 and a balancing slot 15 'on the other side. This disc rotates with item 10

  in the direction indicated by the arrow B and it can be one room with him.

  Downstream of the section 3c with respect to the direction of the arrow A, the element 10 is fixed at one end of a third tubular element 16 which is mounted in a bearing 17 supported by a not shown frame, and whose other end is attached to a rotary guide 18 having a conduit

  oblique 19 which connects the axial duct 3 to an off-center outlet 20.

  The rotary guide 18 is part of a deposition head 21 of known type, arranged to continually deposit the wire 1 (or wires) in the form of turns 22 on a guide member 23 along which the turns advance while being driven by an endless conveyor belt 24 with pins 25, guided and driven by rollers 26. The guide member 23, sometimes called saber, does not rotate; it is centered by a bearing 27 on an axial pin 28 fixed in the guide 18. A roller 30, rotating in the direction indicated by the arrow, and provided with a rubber band 31, drives the wire turns by friction between the 20 and the guide member 23. The deposition head 21 may be for example at the entrance of a continuous drying chamber 32, which is shown schematically a wall 33. In this chamber 32, the turns of wire 22 are exposed to a hot air stream in a closed or open circuit (not shown), which continuously dries them before the wire is taken up from the guiding member 23 and rewound

by a winder of known type.

  As shown in Figure 2, the disk 14 carries two eccentric and diametrically opposed studs 34 and 35, on which are mounted respective pivoting arms 36 and 37 which are connected by springs 38 and 39 to rods 40 and 41 attached to the disk. . These springs tend to hold both arms in a first position, shown in solid lines in the figures. One end of the arm 36 has a guide orifice 42 of the same diameter as the conduit 3. In the first position of the arm 36, this orifice is centered on the axis 4 so that, when a wire I is introduced, in the axial duct 3, this wire necessarily passes through the guide orifice 42. An elongated lid 43 disposed on the arm 36 closes the slot 13 in this position, in order to prevent air leakage and inadvertent passage of the wire in this slot during his introduction in the

leads 3.

  A second position 36 ', 37' of the arms 36, 37 is shown in broken lines in Figures 1 and 2, and is defined by respective stops 44, 45 can be adjustable on the disc 14 to define different centrifugation rays . In this second position of the arm 36, the guide orifice 42 occupies an eccentric position 42 'relatively far from the axis 4, and it thus forces the wire 1 to follow an eccentric path 1', represented in dashed lines and coming out of the axial duct 3 through the slot 13. When the device rotates at high speed about the axis 4, this subjects the wire to a centrifugal spinning energetic along the path 1 '. Meanwhile, the arms 36 and 37 are held in their second position by the centrifugal force, at

  against the traction of the springs 38 and 39.

  So that the two arms 36 and 37 rotate in synchronism and to the same extent, that is to say that their masses balance each other during rotation, the studs 34 and 35 which carry them are connected to each other. the other by a link mechanism 46, located on the other side of the disc 14 relative to the arms, upstream of the side slot 13 by or passes the wire. These rods are not shown in FIG.

to clarify - the drawing.

  The device described above is used as follows to

  treat one or more son I leaving for example a dye bath.

  In a first step, the rotating part of the device is rotated, in particular the elements bearing the numbers 10, 14, 16 and 18 at a restricted speed, below a limit speed below which the initial tension of the springs 38 and 39 is sufficient to hold the movable arms 36 and 37 in their first position. It is then possible to introduce the wire 1 into the axial duct 3 by advancing it by means of the air current controlled by the valve 8, until the end of the

  The thread touches the rubber band 31 of the roller 30 and is driven by it.

  The wire then begins to form the turns 22 which are driven by the band 24 on the guide member 23. At this stage, the injection of compressed air can be stopped, and simultaneously increase the speed of rotation beyond the speed limit, which can be for example 5 400 rpm. The movable arms 36 and 37 then undergo a centrifugal force which moves them from the axis 4 to their second position in which the arm 36 causes the spinning of the wire while the arm 37 simply serves to balance the rotating masses. The rotational speed may vary for example between 7500 and 400 rpm, particularly depending on the size of the wires, which may range from metric number 5 to metric number 25 in a device. of the type described above. By adjusting the degree of opening of the arm 36, by means of the abutment 44, and thus the centrifugation radius, depending on the size of the wire, it is possible to avoid subjecting fine wires to

too high traction.

  FIGS. 3 and 4 show a more elaborate embodiment of the device according to the invention, more particularly the part of the device corresponding to the zone of the rotary tubular element 10 and the rotary disk 14 of FIGS. 1 and 2. The construction and operation of the device of Figs. 3 and 4 are similar in principle to those of the device of Figs. 1 and 2, but similar reference numerals, but increased by 100, have been used for corresponding elements of both devices. For example, the disk 114 of Figure 3 replaces the disk 14 of Figure 2 and has symmetrical notches 115, 115 'which are wider than the notches 15, 15' to lighten the disk. In addition, it is noted that the adjustable stops 144, 145 for retaining the pivot arms 136, 137 are rods provided with knurled buttons 151, 152 disposed on the other side of the disc. They can be displaced by insertions in different holes such as 144 'and 144 ", formed in the disk 114. In FIG. 4, two sliding rings 153, 154, for example

  ceramic, serving as support for the wire 1 centrifuged on the course 1 '.

  9- A difference between the two embodiments mentioned above is that the link mechanism 46 is replaced by a toothed belt mechanism I55, passing on two gears 156, 157 fixed to the respective studs 134, 135 carrying the pivoting arms 136,

137.

  FIG. 5 schematically illustrates an embodiment in which the disks 14 or 114 described above are replaced by a disk 60 devoid of moving parts. The disc 60, which rotates with the tubular member 10 in the direction indicated by the arrow B, has an elongate wire guide opening 61, having a spirally curved slot shape between a first end 62, close to the axis. 4 but slightly offset from it, and a second end 63 close to the periphery of the disc. For the pneumatic threading of the yarn, a guide funnel (not shown) can be provided in front of the eccentric end 62 of the opening 61. The threading is done at a restricted speed of rotation, then the speed is increased. The wire passing through the opening 6I is then pushed outwards, by the centrifugal force and by the convex spiral edge 64 of the opening, to the end 63 where it is retained radially as well as the speed rotation is big enough. It should be noted that any suitable geometry can be given to the opening 61, in particular a spiral shape much longer than that of FIG. 3 and forming a much more pronounced angle with the radial directions.

  corresponding of the disc 60, to better push the wire outwards.

  The present invention is not limited to the embodiments described above, but it extends to any modification or variant obvious to a person skilled in the art. In particular, it may design various variants of the movable guide member mounted on the rotary member and provided with a guide orifice arranged to move from a centered position to a position remote from the axis of rotation either under the effect of centrifugal force or by means of a control provided

for this purpose.

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Claims (15)

claims   1. A method of centrifugally spinning at least one textile thread impregnated with a liquid, in particular an exhausted or non-exhausted dyeing solution, characterized in that the thread (1) is passed continuously along the length a path passing in a guide means (42, 61, 142) rotatable about an axis (4, 104), and in that the guide means is rotated so as to keep the wire at a distance of the axis of rotation and thus subject him to   centrifugation on a part (1 ') of its course.   2. Method according to claim 1, characterized in that it comprises an initial step of pneumatic threading, in which one end of the wire is introduced into the guide means from an axial duct (3,   103) for feeding the wire, by means of an air jet in this axial duct.   3. Method according to claim 2, characterized in that one uses a guide means having a movable orifice (42, 142) and in that one maintains, during the initial step of threading, this orifice in a first position close to the axis of rotation, and then placed in a second position (42 ') away from the axis to perform said centrifugation. 4. Method according to claim 3, characterized in that the movable orifice (42, 142) is brought into its second position by a centrifugal force effect. 5. Method according to claim 4, characterized in that the movable orifice (42, 142) is part of a rotary member (36, 136) and in that said rotary member is rotated at a first speed, less than a predetermined limit speed, during the initial threading step, then at a second speed greater than this limit speed during the centrifugation.   6. Process according to claim 1, characterized in that   scroll together several threads along said path. - I1 -   7. Centrifugal wiping device of at least one textile thread continuously driven, for carrying out the method according to claim 1, characterized in that it comprises a rotary element (10, 110) about an axis. (4, 104), longitudinally traversed by a wire (1) and coupled to rotational drive means (12), and in that said rotatable element (10, 110) comprises a section of tubular inlet duct of the wire (3a) and a tubular lead section of the wire outlet (3c), these two sections being centered on the axis, and at least one guide orifice (42, 61, 142) disposed on the path of the wire between these two sections (3a, 3c) and arranged to keep the wire away from the axis of rotation on a part (1 ') of his career.   8.- Device according to claim 7, characterized in that the rotary member (10, 110) comprises an axial tubular duct (3, 103) comprising said inlet (3a) and outlet (3c) sections of the wire, as well as an intermediate section (3b) provided with a lateral opening (13, 113), and in that the device comprises pneumatic means (5 to 8) for threading the thread into the rotary element by injection of air in the axial tubular duct (3, 103).   9. Device according to claim 8, characterized in that the pneumatic threading means comprise a stationary tubular element (5), centered on the axis of rotation and placed upstream of the rotary element (10) on the path of the wire, said stationary element (5) being provided with means (6) for injecting compressed air towards the tubular conduit axial (3).   10. Device according to claim 7, characterized in that the rotary element (10, 110) comprises a disc (14, 60, 114) centered on the axis of rotation (4, 104) and provided with at least one opening (15, 61, 115) having an end near the axis and extending to near the periphery of the disc.   He. Device according to claim 7, characterized in that the guide orifice (42, 142) is defined by a movable part (36, 136) mounted on the rotary element (10, 110), this orifice (42, 142). having a first - 12 -   position near the axis (4, 104) and at least one second position (42 ') away from the axis.   Device according to claims 8 and 11, characterized in that,   in said first position, the guide orifice (42, 142) is in said intermediate section (3b) of the axial duct, and in that said movable part (36, 136) comprises a cover (43, 143) covering said lateral opening (13, 113) in this first position, so   to facilitate pneumatic threading.   Device according to claims 10 and 11, characterized in that   said movable member is a pivoting arm (36, 136) mounted on the disc (14, 114) and biased by a spring (38, 138) towards the first position of the guide orifice (42, 142). This arm being arranged to pivot to the second position (42 ') of said orifice under the effect of the   centrifugal force, against the force of the spring.   14. Device according to claim 13, characterized in that the second position (42 ') of the guide orifice is defined by an adjustable stop (44, 144) mounted on the disc and cooperating with the pivoting arm (36, 136). ). 15. Device according to claim 13, characterized in that said spring (38, 138) is prestressed so as to apply to the pivoting arm (36, 136), in the first position of the guide orifice (42, 142), a centripetal force that holds the arm in that position at a rotational speed, below a given speed beyond which the arm pivots outward under the effect of centrifugal force and submits the wire centrifugation.   16. Device according to claim 13, characterized in that it comprises a balancing arm (37, 137) pivotally mounted on the disc and connected to the pivoting arm (36, 136) by a mechanism synchronizing the movements of both arms so that their respective masses are   balanced with respect to the axis of rotation. - 13 -   17. Device according to claim 10, characterized in that the guide orifice is formed by said elongated opening (61) of the disc (60), this opening having a first end (62), located near the axis of rotation (4) and corresponding to a position of thread threading, and a second end (63) located near the periphery of the disc   and corresponding to a position of centrifugation of the wire.   18. Apparatus for continuously drying at least one textile yarn, characterized in that it comprises a centrifugal wiping device according to claim 7, a rotary head (18) continuously depositing the wire in the form of turns on conveying, and an enclosure (32)   continuously drying, traversed by said conveying means.   19. Installation according to claim 18, characterized in that said rotary head (18) - is coaxial and rotatably connected to the rotary member of the mechanical dewatering device, this head containing an oblique duct (19) for the passage of the wire of said axial tubular duct   (3) to an outlet port (20) remote from the axis.