DE1115163B - Method and device for the pneumatic spinning of a thread - Google Patents

Description

The invention relates to a method for pneumatically spinning a thread from fibers in the Area of the vortex axis of an eddy current, the axial flow of which is opposite to the withdrawal direction of the spun thread is directed, in which the eddy current flowing through into a swirl zone Exhaust air is formed, in which the is in the helical outflow in the area between the feed point of the fibers and the twist zone (spinning zone) from the fibers forming loosely wound The fiber strand is drawn through the twist zone and thereby spun into the finished thread.

The invention also relates to a spinning device for carrying out this method.

In a known pneumatic spinning device are fed by a roller Sliver (roving) the fibers sucked tangentially into a housing by an air stream, in which a suction head rotates. A screw-shaped and spiral-shaped one is created on this rotating suction head Suction eddy current flowing into a fine opening of a sieve attached to the face of the suction head flows out. At this localized narrow point, the thread should be formed from the fibers by swirling will. The device according to this patent, in which the thread in the suction direction or in the flow direction the suction air is withdrawn, has the significant disadvantage that the fibers on the aforementioned The sieve get stuck and the suction opening of the sieve is quickly clogged.

A pneumatic spinning device is also proposed, in particular for spinning glass fibers which consists of a tube that has a tangential inlet channel over its entire length for the compressed air or hydraulic fluid supplied Has fibers. This tube is completely open on one end, while the other Front side is closed and only a small outlet opening for the spun pulled here Has thread. With this device, it is not possible to spin a thread that the provided Meets requirements, d. H. a sufficient evenness and especially a stronger one Twist and thus has a corresponding tear strength.

It is also a method of pneumatically spinning a thread with the fibers leading suction vortex flow has been proposed in which one by tangential air suction helical suction air flow is generated, the length of which is a multiple of its diameter

Method and device
for pneumatic spinning of a thread

Applicant:

Konrad Götzfried,

Göggingen via Augsburg,

Gabelsbergerstrasse 75

Konrad Götzfried, Göggingen about Augsburg,
has been named as the inventor

and its speed continuously decreases considerably, and with this suction vortex air flow at a distance from the suction point, the fibers are fed in with a further suction air flow and the thread that forms in a manner known per se against the axial air flow of the eddy current is deducted.

A device for performing this older procedure consists of a cylindrical mouthpiece, one axial outlet opening for the spun thread and one tangentially into the axial bore of the mouthpiece has opening air intake slot, one adjoining this mouthpiece longer spinning tube connected to a vacuum source and from one into the Spinning tube opening feed tube for the sucked fibers. That part of the axial bore of the mouthpiece, into which the tangential suction slot opens, is closed according to the older proposal a swirl chamber which is much larger in diameter and whose height is considerably smaller than their diameter.

In this process, there is only a very weak eddy current caused by constant fiber winding a continuous fiber strand around the freely ending rotating thread, which is only at a greater distance from the spinning zone is twisted into a tear-resistant yarn. Will the required high flow rate Generated in the swirl zone by suction air, this requires a very high negative pressure (in practice at least 650 mm water column), whereby not only the at the tangential suction slots of the swirl chamber required intake air flows, but at the outlet opening for the spun thread and ins-

109 708/232

3. . 4th

special at the nozzle of the sucking fibers axially connected by a stretching tube 6 at a distance,

additional unusable air currents arise, the spinning cone is at a distance from a mantle

which the axial flow in the spinning zone considerably enclosed tube 7, which is airtight at one end

increase and uneconomical fiber suction connected to a cylinder 30 and at the other end

lead up to 3O ⁰ / * of the supplied amount of fiber. 5 is connected to a suction line 29, which leads to a

The invention is based on the method of a vacuum source (suction pump or fan) leads, The type mentioned above and is characterized by the cylinder 30 has an axial bore and is characterized that the flowing into the swirl zone widens into a disc-shaped swirl chamber 4. The Compressed air forms a circular compressed air ring. Swirl chamber 4 has an outlet opening 37 for

In a known method, there is no printing io the finished spun thread 20 and several in the

air ring is generated, but only a compressed air spiral. Swirl chamber tangentially opening channels 5, the

This is due to the fact that only one pressure valve 8 has to be closed in the swirl zone. Of the

air duct opens tangentially. Cylinder 30 is surrounded by a compressed air chamber 9

A compressed air ring is only generated when z. B. connected to a compressed air line 10

several compressed air jets tangentially in the swirl zone 15 is closed. Due to the tangential inflow of

pour in. Accordingly, the compressed air blasting according to the invention through the channels 5 is formed in

According to one embodiment of the method, the swirl chamber 4 has a rotating compressed air ring

indicates that the circulating compressed air ring has a very high rotational speed, which is caused by

through several tangentially flowing into the swirl zone, the axial bore of the cylinder 30 and the

Mende compressed air jets is formed. 20 closing stretch pipe 6 with the removal of its

The negative pressure required to generate the speed helically in the spinning cone 1 Suction air flow, in the case of the flow according to the invention, amounts to itself with the fibers with it Process only about 70 to 100 mm water column. to unite leading suction air flow. It arises This prevents the unproductive flying away of the resulting whirling - rotating compressed air column, Avoid fibers from the spinning zone. Characteristic 25 whose speed is at a distance from the for the new method is that the pneumatic swirl chamber is significantly reduced. Those in the area Yarn twist completely independent of the spinning zone of the rotating fiber strand coming fibers greater distance with compressed air in the swirl zone, this takes place in a weak turbulent flow. This not only reduces the fiber curl, while at the same time stretching the loose fiber loss to a maximum of 5 ° / », but the yarn quality 30 strand is achieved. It becomes a cumbersome environment with regard to the tensile strength and even loops of the free-flying fibers at the free-end improved. rotating fiber lap achieved the suction

It is a device for whirling fibers with free-flying fibers through the air suction pipe 33 tangential compressed air inflow known. Which largely prevented, so that only a small part Compressed air is tangential into a cyclone - the fibers fed in are unused through the suction chamber introduced, at the outlet opening of which a tube 33 is sucked into a collecting container. Thread made of fibers introduced into this chamber. The piecing is after a brief throttle is formed. With this device, it is not the tangential compressed air channels 5 of the swirl chamber possible to make a tightly twisted thread. With hats of the rotary valve 8, which is through a the circling compressed air ring according to the invention 40 lever 36 is pivotable, only one thread end on the other hand, a swirl is to be introduced into the outlet opening 37 in the swirl chamber. At this already loosely spun fiber strand achieved. The thread end that is immediately sucked in is then formed in in particular, the winding formation of the new fiber strand, the direction known, centrifugally bulging then with gradually increasing rotation as fer-fiber balloon, by the action of the pressure 45 tiger thread through the pair of rollers 35 by one air creates a particularly strong twist of the yarn. V-shaped thread guide 34 are withdrawn around This fiber balloon forms in the twist zone that can. The spinning cone 1 through the suction tube 2 not actually for spinning, but only for the fed fibers 3 are through one at the end Twisting serves. seated suction nozzle 18 sucked.

An apparatus for practicing the invention is 50 In the embodiment shown in FIG

According to the spinning process, a fiber sliver 11 (e.g. carding

shown on a larger scale. It shows or stretching tape) is provided, which in itself is known

Fig. 1 shows a pneumatic spinning device in the ter way by a compressor 12 from a conveyor

vertical section, derwalzel3 on a polished plate 14 to a

Fig. 2 shows a cross section along the line H-II of the 55 driven screw-toothed plucking roller

Fig. 1, 15 is drawn with an endless over

3 shows a plan view of the plucking roller and the elastic conveyor belt guided by rollers 16 and 17

Fiber suction tube, 28 made of rubber or the like. Cooperates. With

4 shows a vertical section through the spinning roller 15, the fibers or small fiber tubes with a modified design of the air intake 60 tufts 3 plucked from the sliver 11, which from tube, the suction nozzle 18 are sucked. By accessing

Fig. 5 is a perspective representation of the circling interaction of the swirl chamber 4 coming from

Compressed air ring and the screw-thread outflowing compressed air vortex with the suction air flow

the compressed air. can the pneumatic spinning device with

The spinning cone 1 can be operated with its laterally converging 65 relatively low negative pressure,

the fiber suction tube 2, which is used to supply the freely

flying fibers 3 is used with a spacing system, with a negative pressure of

thereof arranged disc-shaped swirl chamber 4 only about 70 to 100 mm water column.

The diameter of the tangential inflow channels 5 for the compressed air in direction A depends on the overpressure of the compressed air, so that at a higher pressure the total opening has to be about 5 sqmm, with a lower overpressure of, for example, V ₂₀ atü, about 15 sqmm. When compressed air is introduced tangentially into the swirl chamber 4 of the cylinder 30, a very high rotational speed can be achieved with a relatively small amount of air, the swirl chamber 4 expanding in the shape of a disc to achieve a high rotational effect. In this embodiment, in the swirl chamber rotates a disk-shaped air ring which issues a pronounced balloon 20 in the swirl chamber the yarn c, creating a strong swirl effect is exerted on the thread in a conventional manner. Each revolution of the thread balloon causes a rotation in the thread, which is rotated around its axis like on the ring spindle and, due to its multiple curvature, completely or partially prevents the free-ending thread from being twisted backwards. A thread which is in rotation and which is guided at both ends normally untwists again by itself due to its reverse rotation force; However, the yarn is c 20 as shown in Fig. 1 illustrates, multiple curved, so the decline in rotational force is less than the Zudrehung. In addition, the thread 20 has a free end at 20 a. As a result of these air-induced thread curvatures, the thread is twisted to its full torsional strength many times faster than the thread's automatic untwisting or unwinding. With the adjustable air pressure in the chamber 9, the speed of rotation of the circulating air ring or the torsional strength of the thread can be regulated continuously. The thread balloon tension caused by the thread is neutralized by regulating the opposite thread tension in the stretching tube 6. For this purpose, the initially very powerfully rotating compressed air column is partially sucked out of the stretch tube 6 through an annular gap 38 which can be changed with the aid of the slide 6 a , which at the same time creates a weakly flowing compressed air column.

To form a uniformly loose fiber lap 20 a, it is important that the at 18 from the suction tube 2 sucked fibers 3 at the lowest possible speed at an acute angle to the spinning axis flow into the spinning cone 1 and also only a relatively small axial one in this spinning zone Vortex flow prevails. This low flow is also desirable in order to prevent the lap from forming to restrict a short free-ending area of the fiber strand 20 a, as illustrated in FIG. 1. To reduce the flow within the spinning zone 1, radial outlet openings are shown in FIG. 1 in the spinning cone 31 provided so that part of the eddy current air, as in the drawing with arrows indicated, is sucked radially from the air stream. As can be seen from the drawing Fig. 1 and 3, the arrangement is made so that the gap-shaped fiber suction tube 2 in the lateral and axial Direction opens into the spinning cone 1. By the measure described above, the of the conical nozzle 32 flowing compressed air vortex with the parallel to the spinning axis Suction air flow in weak turbulence, whereby due to the winding tendency of the freely rotating The fiber strand and the free-flying fibers continuously form a fluffy fiber lap. Since the If the axial speed of the suction air flow decreases significantly in the spinning zone, only a small amount is created Fiber loss, in order to reduce the latter even further, as indicated in FIG. 4, the spinning cone 1 serve as a safety gear. The fibers can according to FIG. 4 by means of an additionally increased The suction effect is retained here in the area of the spinning zone 1 from the freely rotating fiber strand captured and wrapped around it, practically avoiding any fiber loss.

The spinning cone 1, which is enclosed by a vacuum chamber 21, is controlled by a branching suction line 22 opened by a valve 23 with a conventional solenoid control 24 through a relay circuit and hermetically sealed. The relay circuit is triggered by a thread tension that is in operation causes a constant fiber congestion in the spinning zone 1 and in idle mode (i.e. when no thread is spun) allows the lap to flow through the suction tube 27 unhindered. If necessary, according to FIG. 1, narrow-striped plucking effected by a narrowing guide 25 of the sliver 11 with the plucking roller 15, the fibers through a narrow suction nozzle 18 with a low Amount of suction air can be extracted. According to another example, two spinning devices suction pipes 2 opening in the opposite direction can be connected to a single suction nozzle 18.

With an appropriate fiber feed and the infinitely variable take-off speed, the Thread size can be regulated.

In addition, it should be noted that with the softest possible fluffy fiber lap through the vibrating rolling motion creates a jointly aligned stretched fiber strand, which the The tensile strength of the twisted thread is increased.

Claims (12)

PATENT CLAIMS: - » 1. A method for the pneumatic spinning of a thread from fibers in the area of the axis of an eddy current, the axial flow of which is directed opposite to the withdrawal direction of the spun thread, in which the eddy current is formed by intake air flowing into a swirl zone, in which the is in the helical outflow in the Area between the feed point of the fibers and the twist zone from the fibers forming loosely wound fiber strand is drawn through the twist zone and thereby spun into the finished thread, characterized in that the compressed air flowing into the twist zone forms a circular compressed air ring as in a known false twist device. 2. The method according to claim 1, characterized in that the circulating compressed air ring is formed by several compressed air jets flowing tangentially into the swirl zone. 3. The method according to claim 1, characterized in that the circulating compressed air ring in the swirl zone is swirled inwards in a manner known per se. 4. The method according to claim 1, characterized in that the outer diameter of the Eddy current in the direction of the circulating compressed air ring to the helical outlet flow is narrowed as in a known false twist device. 5. The method according to claim I _5, characterized in that the helical outflow is reduced in quantity by suction at several points with increasing distance from the compressed air ring. 6. Spinning device for performing the method according to claim 1 with an axial one Outlet opening for the twist chamber having the spun thread, with one attached to it Swirl chamber connected stretch tube, which is at a greater distance with a spinning cone with Suction tube for sucking in the fibers is connected, and with one the spinning device at a distance surrounding jacket pipe which is connected to a suction line, characterized in that, that several compressed air channels (5) open tangentially into the swirl chamber. 7. Spinning device according to claim 6, characterized in that the tangential into the swirl chamber opening compressed air channels (5) with throttles, in particular with rotary slide valves (8) are provided. 8. Spinning device according to claim 6, characterized in that the swirl chamber (4), approximately Discus-shaped, opens axially into the stretch tube in a known manner. 9. Spinning device according to claim 5, characterized in that the spinning cone (1) is frustoconical is and that the stretch tube (6) in a known manner axially and the suction tube (2) with gap-shaped cross-section open into it. 10. Spinning device according to claim 8, wherein the suction tube at an acute angle to Spinning axis opens out, characterized in that the mouth is annular around the spinning cone (Fig. 3). 11. Spinning device according to claim 5, characterized in that between the swirl chamber (4) and the spinning cone (1) an adjustable annular gap (38) is provided for sucking off the air is. 12. Spinning device according to claim 5, characterized in that the spinning cone (1) has a plurality of suction holes (31) and extends in the direction of the suction pipe (33), with which it is connected, narrows. Considered publications:
German Patent Nos. 489 538, 166763;
British Patent No. 626,652;
U.S. Patent Nos. 2515299, 2451 504. Legacy Patents Considered:
German patents No. 1056 018, 1 062153. 1 sheet of drawings © 109 708/232 10.61