JPS61186527A - Nozzle for fasciated spinning - Google Patents

Abstract

PURPOSE:To eliminate bad influence caused by an air flow accompanied by rollers set in front of a nozzle for fasciated spinning, and to obtain high-quality spun yarn, by making the shape of the nozzle for fasciated spinning at the side end part of inlet and the shape of yarn passageway in the nozzle into specific shapes. CONSTITUTION:In a nozzle for fasciated spinning which is set just behind a pair of the front rollers 1 at the end part of draft device, and provided with a yarn passageway consisting of the inlet part 6, the small diameter hole part 7 and the large diameter hole part 8 in the interior of the nozzle, and supplied with the spray hole 11 to jet air in the direction to promote advance of yarn bundle eccentrically to the large diameter hole part 8, the shape of this nozzle at the side end part of inlet is made into a shape where two cicrular arcs corresponding the front rollers 1 are connected, and the shape of the inlet part of the yarn passageway is processed into a shape which has its diameter reduced from the inlet to the small diameter hole part 7, and has the diameter of the connected part 6a larger than the inner diameter of the small diameter hole part.

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a nozzle for binding and spinning, and is particularly characterized by a nozzle entrance portion facing a pair of front rollers that are the final rollers of a drafting device. This invention relates to a nozzle for binding and spinning.

(Prior art) In bundle spinning, a fiber bundle continuously supplied from a draft device is introduced into a false twisting nozzle, and a bundle spinning system is produced by heating and untwisting the fiber bundle by the air vortex inside the false twisting nozzle. be done. Binding spun yarn is formed by wrapping binding fibers around a core fiber that extends in the longitudinal direction of the yarn.
The strength of the yarn changes depending on the amount of bound fibers and the winding angle.

Since the bundled fibers are derived from both ends of the ism bundle supplied in the form of a wide ribbon from the front roller, they are easily affected by surrounding air currents. Furthermore, in bundle spinning, the yarn is spun at a high speed, and the front rollers are rotated at a correspondingly high speed, resulting in a strong accompanying air current9. Since the false twisting nozzle is disposed immediately after the front roller, the accompanying air current disturbs the fiber bundle being introduced into the false twisting nozzle in the form of a flat ribbon and affects the winding effect of the bundled fibers, resulting in the spinning. There is a problem in that the quality of the yarn varies.

Hitherto, various structures have been proposed as nozzles for binding and spinning.
As shown in Figure 10, Publication No. 857 or Publication of Utility Model Application Publication No. 58-56878 published on April 18, 1988,
A nozzle 33 is disposed such that a small diameter hole 32 serving as a thread passage faces the front roller 31. However, it is difficult to directly and smoothly introduce the fiber bundle supplied in the form of a wide ribbon from the front roller 31 into the small diameter hole 32. Furthermore, fiber loss tends to increase when the effect of accompanying airflow accompanying the high-speed rotation of the front roller 31 is large. On the other hand, as shown in FIG. The shape of the end face on the inlet side of the binding spinning nozzle disposed immediately after is formed into a shape that combines two circular arc surfaces corresponding to the outer circumferential surface of the 70 controller, and gradually shrinks toward the small diameter hole 32 side. A nozzle 33 is proposed that has an inlet portion 34 that has a diameter and is smoothly connected to a small diameter hole portion 32 . In the case of this nozzle, the ribbon-shaped fiber bundle supplied from the front roller 31 is smoothly introduced into the small-diameter hole 32 through the inlet section 34, but the fiber bundle is smoothly introduced into the small-diameter hole 32 as a thread passage. Because the connection is too smooth, the fibers at both ends of the ribbon-like fiber bundle that are free at one end and should become binding fibers are merged into the center fiber bundle, and when they are heated by the air flow from the nozzle 33, the center fiber bundle There is a problem that there is little difference in behavior between the fibers and the fibers free at one end, and the fibers free at one end are not tightly wrapped around the central fiber bundle during untwisting, and the number of bound fibers is insufficient, resulting in a decrease in yarn strength.

(Problems to be Solved by the Invention) This invention solves the problem of deterioration of yarn quality due to the influence of accompanying airflow around the front roller rotating at high speed, or the inner free TIgM at both ends of the fiber bundle supplied in the form of a flat ribbon. This solves the problem that the yarn strength of the spun yarn decreases due to being merged into the center Jim bundle.

Structure of Kojimei (Means for solving the problem) In order to solve the above problem, in this invention, the inlet end of the binding spinning nozzle is connected to the circumference of a pair of front rollers, which are the final rollers of the drafting device. Two arcuate surfaces corresponding to the surface are formed in a continuous shape and are disposed close to the front roller.

Further, the diameter of the inlet portion of the nozzle decreases from the front roller side to the small diameter hole side, and the diameter of the joint portion with the small diameter hole portion is formed to be larger than the inner diameter of the small diameter hole portion.

(Function) In the binding spinning nozzle of the present invention, the inlet side end of the nozzle disposed immediately after the front roller is formed in an arc shape along the outer circumference of the front roller, and is arranged close to the outer circumference of the front roller. Therefore, the influence of the accompanying air current generated due to the high speed rotation of the front roller is suppressed from reaching the inlet of the nozzle, and the appearance of the spun yarn is improved.

Furthermore, due to the step provided at the connection between the inlet section and the small diameter hole section, a small vortex is generated in this section, and the bundle 1 at both ends of the fiber bundle fed from the front roller in the form of a flat ribbon is generated.
Since 48M, which is free at one end to become aM, acts to lift up from the central fiber bundle, the binding effect during untwisting is enhanced and the yarn strength is improved.

(Example 1) A first example embodying the present invention will be described below with reference to FIGS. 1 to 3. A first nozzle 2 is arranged near the rear (downstream side in the II fiber traveling direction) of a front roller 1, which is the final roller of a drafting device that continuously drafts a fiber bundle and supplies it as a ribbon-like flat fiber bundle. It is set up. A second nozzle 3 is located behind the first nozzle 2, and a horizontal space S is formed between the outlet side end face of the first nozzle 2 and the inlet side end face of the second nozzle 3, and both nozzles 2, 3 are arranged so that the central axes of the thread passages are bent within the same plane.

The first nozzle 2 includes a nozzle housing 4 made of an easily processable material such as metal or plastic, and a nozzle body made of a wear-resistant material such as ceramics and fixed to the nozzle housing 4 from its outlet side. It consists of 5. The nozzle housing 4 has an inlet end formed in a continuous shape with two arcuate surfaces corresponding to the outer peripheral surface of the front roller 1, and a truncated conical inlet part continuous with the nozzle body 5 in the center. 6 is formed. A yarn passage is formed in the nozzle body 5 from the upstream side to the downstream side in the fiber bundle traveling direction, and consists of a small diameter hole section 7, a large diameter hole section 8, and an outlet section 9. An air injection hole 11 (near the connecting end with the hole 7) is provided on the inner periphery of the nozzle housing 4 and has one end communicating with an air tank 10 connected to an external compressed air source (not shown). It is inclined in a direction that promotes this and is eccentrically opened in the large diameter hole 8. The yarn passage walls of the large-diameter hole 8 and the outlet 9 are formed into smooth surfaces with low frictional resistance in order to enhance the swirling effect of the first nozzle 2. Further, the outlet portion 9 is formed in a tapered shape that widens toward the downstream side in order to promote exhaustion of the injected air.

The diameter of the connection part of the inlet part 6 with the nozzle body 5, that is, the connection part with the small diameter hole part 7, is formed to be larger than the inner diameter of the small diameter hole part 7, and there is a gap between the small diameter hole part 7 and the inner surface of the inlet part 6. A stepped portion 6a is formed on the surface. If the difference in level is too large, the passage of the fiber bundle becomes excessively smooth, so it is not preferable to provide a difference in level that is too large. Further, the end of the small diameter hole 7 on the side of the inlet 6 is formed into a suitable arc shape to prevent damage to the fibers that come into contact with it.

The yarn passage of the second nozzle 3 consists of an inlet section 12, a small diameter hole section 13, a constriction section 14, a large diameter hole section 15, and an outlet section 16. 1 nozzle 2
One end of a plurality of (two in this embodiment) air injection holes 17 are opened so as to generate a swirling flow that has a heating effect in the opposite direction to the fiber bundle. . The other end of the air injection hole 17 communicates with an air tank 18 provided on the outer periphery of the nozzle. The inlet portion 12 is formed in a truncated conical shape that slightly widens toward the upstream side.

The reason why the inlet part 12 is hardly expanded compared to the inlet part 6 of the first nozzle 2 is that the inlet part 6 of the first nozzle 2 introduces a flat ribbon-shaped fiber bundle. The inlet part 12 of the second nozzle 3 is for introducing the thin fiber bundle that has already been bundled into a thread shape by the first nozzle 2, and if the inlet part 12 is expanded too much, the exhaust from the first nozzle 2 will be introduced into the second nozzle. This is because they get mixed into the yarn path of the nozzle 3 and interfere with the operation of the second nozzle 3. Further, the outlet portion 16 is formed to expand toward the downstream side in order to smoothly exhaust the air flow injected into the yarn passage from the air injection hole 17.

Next, the operation of the nozzle configured as described above will be explained.

The ribbon-shaped flat fiber bundle that is continuously supplied from the front roller 1 of the drafting device is caused by the air flow injected into the large diameter holes 8, 15 from the air injection holes 11.17 into the first
The nozzle 2 and the second nozzle 3 advance the yarn along the yarn path while being affected by swirling flows in opposite directions, and are spun out as a bundled spun yarn. Since the fiber bundle advances while contacting the inlet part 12 of the second nozzle 3 and being bent, the second nozzle 3
The twist applied to the fiber bundle is largely prevented from propagating to the first nozzle 2 side, and the swirling flow of the first nozzle 2 acts in the direction of untwisting the fiber bundle at the second nozzle 3. , the number of twists in the central fiber bundle is reduced, and one end that is not twisted into the central fiber bundle promotes the derivation of free fibers. Furthermore, it is presumed that the swirling flow of the first nozzle 2 has the effect of rotating the fibers with one end free in a direction opposite to the rotating direction of the central fiber bundle, and winding them around the central fiber bundle at an opposite twist angle. Since this winding in the opposite direction coincides with the direction in which the bundled fibers are wrapped after passing through the second nozzle 3, the binding effect is significantly enhanced. or,
The exhaust airflow from the first nozzle 2 is smoothly diffused from the wedge-shaped space S, and the exhaust airflow does not interfere with the operation of the second nozzle 3.

The binding fibers that have a great influence on the yarn strength of spun yarn are the first
The fibers, which are free at one end and are not twisted into the central fiber bundle when subjected to the false twisting action by the nozzle 2, are formed by being wound around the central fiber bundle when subjected to the untwisting action from the second nozzle 3. The fibers that are free at one end and are not twisted into the central fiber bundle are present at both ends of the fiber bundle supplied from the front roller 1 in the form of a flat ribbon. When the fiber bundle is introduced into the small-diameter hole 7 through the inlet 6, if the inlet 6 and the small-diameter hole 7 are smoothly continuous as in the conventional device, the bundle existing at both ends of the fiber bundle Fibers whose one end is free to become fibers are easily merged into the central fiber bundle, and when they are affected by the air flow from both nozzles 2 and 3, the difference in behavior between the peripheral fibers and the central fiber bundle is reduced, resulting in an untwisting effect. Sometimes, the number of bound fibers decreases and the strength of the yarn decreases. However, in this device, since a stepped portion 6a is formed at the connecting portion between the inlet portion 6 and the small diameter hole portion 7, a small vortex is generated at the connecting portion as shown in FIG. The fibers, which are free at one end on the periphery and should be bundled tiA#f1, are lifted up from the center IIN bundle. Therefore, when subjected to the action of the air flow from the nozzle 2.3, the behavior of the central fiber bundle and the peripheral fiber bundle #A is different, and the second
During the untwisting action by the nozzle 3, the peripheral fibers are tightly wound around the central fiber bundle as binding fibers, improving yarn strength.

Furthermore, since there is a step between the inlet part 6 and the small diameter hole part 7, even if a balloon of the fiber bundle is generated, the inner wall surface of the inlet part 6 and the fiber bundle do not come into contact with each other, and the inlet part 6 is formed. Even if the material of the nozzle housing 4 is not a wear-resistant material, damage due to friction with the 4M wire bundle can be prevented. Furthermore, when the front roller 1 is rotated at high speed, an accompanying airflow A is generated from both ends of the roller 1 toward the center, as shown in FIG. The entrance portion 6 side is formed into a continuous circular arc surface corresponding to the outer circumferential surface of the front roller 1, and is disposed in close proximity to the front roller 1, so that the entrainment from both ends of the front roller 1 toward the center is formed. Airflow A is weakened. Therefore, the influence of the accompanying airflow A is extremely weak near the entrance part 6, and the ribbon-shaped fiber bundle supplied from the front roller 1 is smoothly introduced into the first nozzle 2 in a stable state, increasing the yarn strength of the spun yarn. At the same time, the yarn appearance becomes uniform and the yarn quality becomes stable.

A nozzle in which the end of the nozzle is formed into a continuous arcuate surface, and is equipped with a truncated conical inlet part 6, a small diameter hole part 7, a large diameter hole part 8, an outlet part 9, an air injection hole 11, and an air tank 10. It is very difficult to manufacture the nozzle housing 4 from a wear-resistant material such as ceramics, but in this embodiment, the nozzle housing 4 is formed from a material that is easy to process such as metal or plastic.
The first nozzle 2 is constructed by forming the nozzle body 5 having a thread passage in contact with the fiber bundle with a wear-resistant material such as ceramics, and fitting and fixing it into the nozzle housing 4. Therefore, the first nozzle 2 is manufactured. becomes easier.

(Example 2) Next, a second example of the present invention will be described with reference to FIGS. 5 to 7. In the device of this embodiment, the shape of the inlet portion 6 of the first nozzle 2 is different from that of the previous embodiment. That is, the inlet portion 6 is formed in a flat fan shape that expands along the front roller axis from the small diameter hole portion 7 side to the front roller 1 side. A stepped portion 6a is formed at the junction between the inlet portion 6 and the small diameter hole portion 7, as in the previous embodiment. If the width W at the tip of the inlet portion 6 is too wide, the suction airflow into the inlet portion 6 will be weak and, moreover, the airflow caused by the high-speed rotation of the fund roller 1 will cause thread spots to occur. On the other hand, if the width W is too narrow, the introduction of the ribbon-like fiber bundle will not be smooth, and in particular, the fibers that are free at one end and should become binding fibers at both ends of the fiber bundle will be disturbed.
During untwisting, the fiber bundle may not be effectively wrapped around the center fiber bundle, resulting in a decrease in yarn strength, or in some cases, the balloon of the fiber bundle may be stuck at the entrance 6.
It comes into contact with the wall surface and damages the wall surface, as well as causing thread breakage. Therefore, there is a certain suitable range for the nozzle width W. Width W of the tip of the entrance section 6 and the small diameter hole section 7 of the thread passage
The table shows the yarn characteristics of the spun yarns obtained by performing spinning experiments with various ratios of d to the diameter d.

◆ Polyester/cotton (50150) Ne 30 or less per 1000 m of yarn Margin From this experimental result, the entrance width W is 7 to 7 of the diameter d of the small diameter hole 7.
17 times is suitable. Further, in order to spin a large-count yarn, it is necessary to increase the diameter of the small-diameter hole 7, and it is preferable to correspondingly increase the inlet width.

In the nozzle of this embodiment, the width W of the inlet end can be widened to expand the supply width of ribbon-shaped fibers, and the difference in behavior between the peripheral fibers and the central fiber bundle becomes large, the number of bundled fibers increases, and the number of bundled fibers increases. Increases strength. Moreover, since the longitudinal length of the entrance part is short, the suction force into the entrance part 6 does not decrease, and the appearance of the yarn is improved.

Note that the present invention is not limited to the above-mentioned embodiments. For example, as shown in FIG. 8.9, the inner wall of the entrance portion 6 may be formed with a convex or concave surface, It may be formed into an arbitrary shape that expands toward the target. Furthermore, in both of the above embodiments, a bundle spinning nozzle consisting of two nozzles in which the heating directions for the fiber bundle are opposite to each other has been described; The present invention may also be applied to a bundled spinning nozzle configured to arrange the above in a straight line.

Effects of the Invention As detailed above, according to the present invention, the inlet section is formed to have a larger diameter as it approaches the front roller, and the inlet end of the yarn passage is formed to have a smaller diameter than the inlet section, so that the connecting section with the inlet section has a larger diameter. Because of the difference in level, the ribbon-like fiber bundle supplied from the front 0-layer is smoothly introduced into the yarn passage without contacting the wall surface of the entrance portion, so yarn breakage is reduced and yarn quality is stabilized. Further, due to the step, a small vortex is generated in the air flow flowing into the yarn passage from the upstream side of the nozzle, and the outer peripheral fibers that are to become binding fibers at both ends of the fiber bundle are lifted up from the center fiber bundle and twisted into the center fiber bundle. This prevents the binding effect during untwisting and improves the strength of the yarn.

Furthermore, since the inlet end of the nozzle is formed into two continuous arcuate surfaces corresponding to the circumferential surface of the front roller and is placed close to the front roller, the influence of the accompanying airflow due to the rotation of the front roller at the speed of This has the effect that the fiber bundle is introduced into the nozzle in a stable state by preventing it from going backwards, and it is possible to obtain a uniform yarn with an excellent yarn appearance.

[Brief explanation of drawings]

1 to 3 show the first embodiment, in which FIG. 1 is a side sectional view, FIG. 2 is an enlarged sectional view taken along the line A-A in FIG. 1, and FIG. 3 is an enlarged sectional view of main parts. 4 is a perspective view showing the accompanying airflow generated on the nozzle arrangement side of the front roller, and FIGS. 5 to 7 show the second embodiment, and FIG. Figure 6 is a sectional view taken along line B-B in Figure 5, Figure 7 is a sectional view taken along line CC in Figure 6, Figures 8 and 9 are side sectional views of main parts showing modified examples, and Figure 10 is a conventional view. A partially cutaway side view of the device, and FIG. 11 is a side sectional view of another conventional device. Front roller 1, first nozzle 2, nozzle housing 4
, nozzle body 5, inlet part 6, small diameter hole part 7, width of inlet end W1 diameter of small diameter hole part d0 Patent applicant Toyota Industries Corporation Representative Patent attorney On 1) Hironobu Figure 5 Figure 7 Figure 9 Figure IT

Claims (1)

[Claims] 1. Disposed behind a pair of front rollers, which are the final rollers of the draft device, from the upstream side to the downstream side in the traveling direction of the fiber bundle, at least an inlet portion, a small diameter hole portion, and A binding spinning nozzle comprising a yarn passage consisting of a large-diameter hole and an air injection hole that opens eccentrically in the large-diameter hole in a direction that promotes the advancement of the fiber bundle, the inlet side of the nozzle The end portion is formed into a continuous shape with two circular arc surfaces corresponding to the circumferential surfaces of the pair of front rollers, and the entrance portion has a diameter that decreases from the front roller side to the small diameter hole side and is connected to the small diameter hole portion. A nozzle for binding and spinning that is formed so that the diameter of the joint is larger than the inner diameter of the small diameter hole. 2. The knot spinning nozzle according to claim 1, wherein the inlet portion is formed in a truncated conical shape. 3. The bundle spinning nozzle according to claim 1, wherein the inlet portion is formed in a flat fan shape along the front roller axis. 4. The bundle spinning nozzle according to claim 3, wherein the width in the axial direction of the roller at the front roller side end of the inlet portion is 7 to 17 times the inner diameter of the small diameter hole.