JPS59112036A - False twist nozzle for spinning - Google Patents

Abstract

PURPOSE:The titled nozzle for preventing the propagation of false twist to the front roller side and promoting the occurrence of free fibers, wherein the smallest diameter part is formed at the downstream of a small diameter part and a channel for fiber bundle is windingly made between the upper stream part of the small diameter part and an inlet part. CONSTITUTION:In a false nozzle for spinning provided with the inlet part 5, the small diameter part 6 and the large diameter part 7, the opening air jetting hole 8, the smallest diameter part 11 having the minimum cross-sectional area among channels for fiber bundle is formed at the end of the downstream side of the small diameter part 6. A channel for fiber bundle is windingly formed between the upper stream part of the small diameter part 6 and the inlet part 5, rotation of the fiber bundle is prevented, occurrence of balooning is suppressed, end breakage is reduced, and variability of strength in the longer direction of yarn is lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an air false twist nozzle used in knot spinning and the like.

In conventional knot spinning, a bundled spun yarn is produced by heating and untwisting a fiber bundle supplied from a front roller while being suctioned by a false twisting nozzle. Generally, this type of false twisting nozzle has an inlet section, a small diameter hole section, and a large diameter hole section from the upstream side to the downstream side in the traveling direction of the fiber bundle, and the large diameter hole section has a large diameter hole section in the large diameter hole section. It has a structure in which one end of the air injection hole extending tangentially and toward the downstream side is open. If the suction force at the inlet of the false twisting nozzle is insufficient, problems (such as the generation of fluff and fiber wrapping around rollers) will increase. In order to prevent such troubles, there are various methods for increasing the suction force of the false twist nozzle, but the most effective method is to enlarge the diameter of the small diameter hole.

However, if the diameter of the small-diameter hole is simply enlarged, the effect of the injected air flow (thus promoting the ballooning of the rotated fiber bundle, making the running of the fiber bundle unstable, and the strength of the resulting yarn) (In cases where variations occur or are severe, thread breakage may occur.) Therefore, it is necessary to restrain the balloon without reducing the suction force that passes through the inlet.

JP-A-52-634.39 discloses a false twist nozzle in which the large diameter hole itself is bent.

When the large-diameter hole is bent in this way, the fiber bundle comes into contact with the bent portion, which has the effect of suppressing the balloon, but the fiber bundle moves away from the axial position of the large-diameter hole, causing air flow. When it comes into contact with the wall of the large diameter hole, the applied rotation is stopped and the heating power is insufficient. There was a problem with that.

Purpose This invention was made in order to solve the problems of the conventional device, and its purpose is to prevent the propagation of the temporary mold toward the front roller by preventing the rotation of the fiber bundle, thereby preventing the generation of free fibers. By preventing the formation of balloons and stabilizing the shape of the balloons, the running condition of the thread is stabilized and thread breakage is reduced. An object of the present invention is to provide a false twist nozzle for spinning that can reduce directional unevenness.

FIRST EMBODIMENT A first embodiment embodying the present invention will be described below with reference to FIGS. 1
A false twisting nozzle 3 is disposed Q behind the front roller 4 in order to heat and untwist the binding yarn 2. The false twisting nozzle 3 has fibers formed of an artificial part 5, a small-diameter hole part 6, and a part of large-diameter holes 7 from the upstream side to the downstream side in the traveling direction of the fiber bundle 1 (from left to right in FIG. 1). A bundle passage is formed, and the symmetrical position on the wall near the upstream end of the large diameter hole 7 is located at the large diameter hole 7.
An air injection hole 8 is formed which is eccentric to the fiber bundle 1 and opens in a direction that promotes the advancement of the fiber bundle 1. The number of air injection holes 8 is not particularly limited, but 2 to 7, preferably 3 to 5. The other end of the air injection holes 8 is provided on the outer periphery of the false twist nozzle 3 and An air tank 9 (in communication with this) is connected to an air source (not shown). Also, the downstream side of the large-diameter hole 7 is formed in a tapered shape that widens on the downstream side to encourage exhaustion of eruption air. .

The inlet section 5 is formed into a flat fan shape in order to smoothly introduce the fiber bundle 1 supplied in the form of a ribbon from the front roller 4.The small diameter hole section 6 is connected to the downstream end of the inlet section 5. , the axes of the inlet section 5 and the small diameter hole section 6 intersect near the connection section, and the fiber bundle passage is bent at the connection section. (acute angle) is in the range of 10° to 90°, preferably 30° to 60°
is suitable. Although there is no particular limitation on the number of bending directions, it is preferable to bend within a plane perpendicular to the rotation axis* of the front roller 4 as shown in the drawing. If the fiber bundle is bent in a plane parallel to the rotation axis, the widthwise expansion of the fiber bundle may be lost and the bundling effect may be hindered. The contact portion 10 inside the bent portion is formed of an arcuate surface with a small radius in order to prevent damage to the fiber bundle 1 that comes into contact with it. Contact part 10
Otherwise, a step-like, uneven connection may be used.

A minimum diameter portion 11 having a smaller hole diameter than the small diameter hole portion 6 is formed at the downstream end of the small diameter hole portion 6 . The downstream end of the minimum diameter portion 11 projects into the large diameter hole 7, and the projecting end and the hole end of the large diameter hole 7 are connected by a slope forming a connecting portion wall surface 12. When the hole diameter of the minimum diameter portion 11 is d, the hole diameter of the hole end of the large diameter hole portion 7 is D, and the hole diameter of the air injection hole 8 is a, it is formed so that d≦D −2a.

Next, the operation of the false twisting nozzle 3 configured as described above will be explained. The air injected into the large diameter hole 7 of the air injection hole 8 becomes a vortex within the large diameter hole 7 and advances in the downstream direction. This vortex Q is induced, and a suction airflow is generated which flows from the inlet portion 5, through the small diameter hole 6, the smallest diameter portion 11, and into the large diameter hole 70. Further, the vortex has the effect of rotating and heating the fiber bundle 1. In the false twisting nozzle 3, the fiber bundle passage is bent at the connection part between the inlet part 5 and the small diameter hole part 6, so the fiber bundle 1 advances while being forced into contact with the contact part 10. Therefore, the twist caused by the heating effect of the eddy current is prevented from propagating from the contact part 10 to the front roller 4 side, and a large number of free fibers are generated that are not caught in the center of the fiber bundle 1 that is being falsely twisted. The binding effect when the false twist is untwisted in the diameter hole 7* is enhanced and the strength of the yarn is improved.

By shaping the downstream end of the small diameter hole section 6 to form the minimum diameter section 11, the ballooning of the fiber bundle 1 is suppressed (the shape of the balloon is stabilized, the running stability of the yarn is increased, and the yarn is The strength also improves.The reason for this may be as follows. (
1) The provision of the minimum diameter portion 11 increases the contact resistance with the fiber bundle 1, hinders the rotation of the fiber bundle 1, prevents the propagation of false twist to the upstream side, increases free fibers, and causes the above-mentioned problem. Together with the effect of the bent portion, it contributes to improving the yarn strength. (2) The smallest diameter portion 11 acts as a node of the balloon to suppress the vibration of the binding thread 2 in the large diameter hole 7 and stabilize the running of the binding thread 2.
The pressing action of the fiber bundle 1 against the abutting portion 10 is stabilized, the derivation of free fibers is stabilized over time, and strength unevenness in the longitudinal direction of the binding yarn is reduced. (3) Fixing the traveling point of the fiber bundle 1 near the center point of the large diameter hole 7 (this makes it easier to stably receive the action of the vortex generated in the large diameter hole 7. In other words, the fiber bundle When the fiber bundle 1 runs along the inner wall surface Q of the fiber bundle passage in the large diameter hole 7, it is subjected to the action of a vortex in the large diameter hole 7 where it should be heated, and the fiber bundle becomes insufficiently heated. The fibers no longer bind together tightly.

In addition, since the minimum diameter portion 11 is formed so that d≦D-2a, the air flow introduced from the artificial portion 5 through the minimum diameter portion 11 to the large diameter hole 7 is directed to the air injection hole. Since the eruption airflow (from The binding is tight (the strength of the thread is improved).

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. The false-twisting nozzle 3 of this embodiment has an exhaust hole 13 opened at one end on the downstream side of the air injection hole 8, and an exhaust passage 14 that communicates with the large diameter hole 7 through the exhaust hole 13. The structure is largely different from the previous embodiment. Further, in this embodiment, the downstream end of the minimum diameter portion 11 is inside the large diameter hole 7 (this is not formed to protrude, but the downstream end of the minimum diameter portion 11 or the hole end of the large diameter hole 7 is inserted into the large diameter hole 7). The air erupted from the air eruption hole 8 into the large diameter hole 7 is not only discharged from the hole end of the large diameter hole 7, but also a part of it is connected to the fiber bundle 1. After being heated, it is immediately discharged to the outside through the exhaust passage 14 and the exhaust hole 13. Therefore, the flow rate of air introduced from the artificial part 5 together with the fiber bundle 1 increases, and the free fibers are directed forward and untwisted. When the yarn is tied tightly, the strength of the yarn is improved, and the occurrence of fluff around the entrance section 5 is reduced.

In addition, since the air erupted from the air eruption hole 8 and turned into a vortex flows more than necessary (this air accompanies the fiber bundle and does not disturb the arrangement of the outer peripheral fibers of the fiber bundle, the yarn appearance / "L" is improved). Become.

As in the first embodiment, the large-diameter hole 7 can be formed into a tapered shape that expands on the downstream side to promote exhaust, but if the hole diameter becomes too large, the balloon will become violent and the binding yarn will become loose. This is undesirable as it makes driving unstable.Others:
Even if a narrow groove with one end open at the downstream end of the false-twisting nozzle 3 is provided in the wall surface of the large diameter hole 7, evacuation is promoted and the same effect can be obtained. Smoothing the inner wall surface of the diameter hole 7 reduces yarn defects and improves the yarn appearance.

Note that the present invention is not limited to the above-mentioned embodiments Q, and for example, a narrow vertical groove 15 may be provided in the inner wall surface of the minimum diameter portion 11 as shown in FIGS. 6 and 7. In this case, the narrow grooves 15 provide resistance to the rotation of the fiber bundle 1 to encourage the generation of free fibers, and the aperture area is substantially expanded to increase the amount of air flowing in from the inlet portion 5, thereby improving yarn strength. In addition, the shape and structure of each part can be changed without departing from the spirit of the invention, such as bending the bent part not only at the connection between the inlet part 5 and the small diameter hole part 6 but also in the middle of either one. It is also possible to change it arbitrarily.

Effects As detailed above, the present invention forms a minimum diameter portion having the smallest cross-sectional area in the fiber bundle passage at the downstream end of the small diameter hole, and an inlet from the upstream portion of the small diameter hole. By forming the fiber bundle passage in a curved manner between the ends of the fiber bundle, the heating effect of the eddy current (the twist caused by the twisting) is prevented from propagating to the front roller side, and the fiber bundle is free from being caught in the center of the fiber bundle that is being falsely twisted. A large number of fibers are generated, and the binding effect when false twisting is untwisted in the large diameter hole is enhanced, improving yarn strength.

In addition, ballooning of the fiber bundle is suppressed, the shape of the balloon is stabilized, the running state of the yarn is stabilized, the occurrence of yarn breakage is reduced, and strength irregularities in the longitudinal direction of the yarn are reduced.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a false twisting nozzle of the first embodiment embodying this invention, Fig. 2 is a right side view thereof, Fig. 3 is an enlarged side view of the main parts, and Fig. 4 is a second embodiment of the false twisting nozzle. FIG. 5 is a cross-sectional view of the false-twisting nozzle of the example, FIG. 5 is a cross-sectional view of A-Ail in FIG. 4, FIG. 6 is a vertical cross-sectional view of the false-twisting nozzle of the modified example, and FIG. FIG. Fiber bundle 1, false twist nozzle 3, inlet section 5, small diameter hole section 6, large diameter hole section 7, air injection hole 8, contact section 10, minimum diameter section 11° Patent applicant Toyota Industries Corporation. Reason
Person Patent Attorney On 1) Hiroshi Nobuo Figure 1 Figure 21! r Figure 3 M4 Figure 6 Figure 7 U/11

Claims (1)

[Scope of Claims] 1. A fiber bundle passage consisting of a small diameter part, a small diameter hole part, and a large diameter part, extending from the upstream side to the downstream side in the traveling direction of the fiber bundle; In a false twisting nozzle for spinning, in which an air injection hole is opened in a direction that promotes the advancement of the fiber bundle in the thick single-thread hole, the downstream end of the small-diameter hole is Before this, the fiber bundle passage is bent between the upstream part of the small diameter hole and the artificial part. A false twisting nozzle for spinning, characterized in that: 2. The downstream end of the minimum diameter portion is formed with a protrusion inside the large diameter (L portion). The false twisting nozzle for spinning according to this description. 3. The hole diameter of the minimum diameter portion is less than or equal to the value obtained by subtracting a value twice the hole diameter of the air injection hole from the child diameter of the large diameter hole. A false twist nozzle for spinning according to claim 1 or 2, characterized in that: