JPS61186528A - Nozzee 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 fasicated spinning, and to obtain high-quality spun yarn, by making the shape of the nozzle for fasciated spinning at the side part of inlet into a specific shape. CONSTITUTION:In a nozzle for fasciated spinning set jut behind a pair of the front rollers 1a and 1b at the final part of a draft device, the shape of the this nozzle at the side end part of inlet is made into a shape where the two circular arcs 8a and 8b corresponding to the peripheral faces of the front rollers 1a and 1b are connected with a small circular arc face with the radius R of <=1.0mm.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to a nozzle for bundling and spinning, and in particular, to a nozzle for bundling that is characterized by a nozzle inlet facing a pair of 70 rollers, which are the final rollers of a drafting device. This relates to a spinning nozzle.

(Prior art) In bundle spinning, a fiber bundle continuously supplied from a drafting device is introduced into a false twisting nozzle, and a bundled spun yarn 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 (center fiber bundle) extending in the longitudinal direction of the yarn, and the strength of the yarn changes depending on the amount of binding fibers and the winding angle. Since the bundled □ fibers are derived from both ends of the fiber bundle supplied in the form of a wide ribbon from the front roller, they are easily affected by surrounding air currents. In bundle spinning, the yarn is spun at a high speed, and the front roller is correspondingly rotated at a high speed, generating a strong accompanying airflow. As shown in FIG. 6, a strong accompanying airflow A is generated on the nozzle arrangement side of the front roller 31 from both ends of the roller 31 toward the center. Since the false twisting nozzle is disposed immediately after the front roller 31, the peripheral fibers that are to be the binding fibers at both ends of the fiber bundle, which are being introduced into the false twisting nozzle in the form of a flat ribbon, are placed in the center. focused on
When subjected to the action of the air vortex flow from the false twisting nozzle, the difference in behavior between the peripheral fibers and the central fiber bundle becomes smaller, and during untwisting, the number of bundled fibers decreases and the yarn strength not only decreases, but also due to the accompanying airflow. There is a problem in that the surrounding fibers are disturbed and the appearance of the spun yarn becomes non-uniform.

Conventionally, various structures have been proposed for knot spinning nozzles, but none have taken into account the influence of the accompanying airflow of the front roller at the inlet. Slightly, December 5, 1963
Special Publication No. 1972-28250 or Showa 5
Japanese Patent Laid-Open No. 52-63439 published on May 25, 1987 describes the shape of the inlet side end face of a binding spinning nozzle disposed immediately after the front roller as two arcuate surfaces corresponding to the outer circumferential surface of the front roller. Although the figure shows a case in which the nozzle is formed into a shape that is a combination of the two, there is no description of the relationship between the shape of the nozzle end face and the quality of the spun yarn.

(Problems to be Solved by the Invention) This invention solves the problem that the strength of the spun yarn decreases due to the influence of accompanying airflow accompanying high-speed rotation of the front roller, resulting in uneven yarn appearance, etc. It is.

Structure of the Invention (Means for Solving the Problems) The binding and spinning nozzle of the present invention has a pair of front rollers that are the final rollers of a drafting device that supplies fiber bundles to the nozzle in the form of a flat and wide ribbon. The inlet side end face disposed at the rear of the roller is formed in a shape in which two circular arc surfaces corresponding to the pair of front roller circumferential surfaces are continuous, and the tip part where the hundred circular arc surfaces are continuous with each other is 1.0 +
It is formed in the shape of a small circular arc with a radius of less than m.

(Function) In the binding spinning nozzle of the present invention, the inlet end, which is formed in a continuous shape of two arcuate surfaces corresponding to the peripheral surfaces of a pair of front rollers, which are one final roller of the draft device, is connected to the outer periphery of the front rollers. Spinning is performed with the animals placed in close proximity. Therefore, as the front roller rotates, the accompanying airflow from both ends of the roller toward the center is suppressed, causing turbulence in the airflow at the inlet of the binding spinning nozzle (as a result, the strength of the spun yarn, the appearance of the yarn, etc.) In addition, since the continuous tip of the 100-circle arc surface is formed into a small arc shape with a radius of 1.011111 or less, the lI wire bundle introduced from the inlet may get caught, and the nozzle assembly may be difficult. There is no risk of injury to the operator during maintenance work.

(Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 4. Behind the front roller 1, which is the final roller of the drafting device that continuously drafts the fiber bundle and supplies it as a ribbon-shaped flat bundle 41i, 111, the ribbon-shaped Nozzle 2 that heats and untwists the continuously supplied fiber bundle to create a binding thread.
is installed.

From the upstream side to the downstream side in the traveling direction of the fiber bundle (
From left to right in Fig. 1): entrance section 3, small diameter hole section 4,
A fiber bundle passage consisting of the constricted part 4a and the large-diameter hole 5 is formed, and the fiber bundle passage is formed on the upstream side of the large-diameter hole 5 (near the connecting end with the constricted part 4a).
An air injection hole 7, which is provided on the outer periphery of the nozzle and has one end communicating with an air tank 6 connected to an external compressed air source (not shown), is inclined in a direction that promotes the advancement of the fiber bundle and has a large diameter hole 5. The opening is eccentric. Small diameter hole portion 4 of inlet portion 3
The diameter of the connection part with the small diameter hole part 4 is formed larger than the diameter of the small diameter hole part 4,
A stepped portion 3 a is formed between the small diameter hole portion 4 and the inner wall surface of the inlet portion 3 . Further, the downstream side of the large-diameter hole portion 5 is formed in a tapered shape that becomes wider toward the downstream side so as to promote exhaust of the injected air.

The inlet side end of the nozzle 2 is formed into a continuous shape of two arcuate surfaces 8a and 8b corresponding to the circumferential surfaces of the pair of front rollers. Then, a hundred circular arc surfaces (3a, (3b
The gap 81°$2 between the front roller 1 and the bottom roller 1 is arranged such that the gap S1 on the bottom roller 1a side is smaller than the gap S2 on the top roller 1b side. Also, the gap 81.82
The value of is set to approximately 1 ml or less. hundred circular arc surface 8
It is better to make the tip 9 where a and 8b are continuous so that it is sharp so as to get it as close to the front roller as possible in order to prevent the accompanying airflow A from both ends toward the center due to the rotation of the O seat roller 1, but if it is made too sharp In this case, fibers may get caught on both sides of the inlet section 3, resulting in yarn breakage, or when an operator is installing or maintaining the nozzle, the tip section 9 may become caught.
Therefore, the radius R of the small arc of the tip 9 must be 0.
The range of 1 to 1°Qmn+ is preferable.

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

The fiber bundle that is continuously supplied in the form of a flat ribbon from the front roller 1 of the drafting device is rotated by the air flow injected from the air injection hole 7 into the large diameter hole 5. It progresses along the path and is spun out as a bundled spun yarn.

In this device, the arcuate surface 8a on the inlet portion 3 side of the nozzle 2
, 8b are the bottom rollers 1a forming the front roller 1.
The front roller 1 is disposed close to the top roller 1b, and the tip 9, in which the arcuate surfaces 8a, 8b are continuous, is formed in a small arc shape. The oncoming accompanying airflow A is weakened. Therefore, the peripheral fibers that are to become binding fibers existing at both ends of the fiber bundle introduced into the inlet part 3 of the nozzle 2 in the form of a ribbon enter the small diameter hole part 4 in a stable state without being bundled to the center. will be introduced. Therefore, when subjected to the action of the air flow from the nozzle 2, the difference in behavior between the peripheral fibers and the central fiber bundle becomes large, and the fibers, which are free at one end and exist at both ends of the ribbon-shaped fiber bundle, become bundled during untwisting. Since the fibers are tightly wrapped around the central fiber bundle, the yarn strength is improved. Also, entrance section 3
Since there is almost no turbulence in the vicinity, the fiber bundle progresses in a stable state and the appearance of the yarn is improved. Furthermore, since the tip 9 is formed in an arc shape, even if the fiber bundle introduced into the inlet 3 comes into contact with the tip 9, the fibers will not be caught and damage to the threads will be prevented.

Furthermore, there is no fear that a worker will be injured by the tip 9 during assembly of the nozzle during work or maintenance work.

The table shows the evaluation results of the spun yarns obtained by carrying out spinning experiments with various changes in the radius R of the tip portion 9.

Polyester/cotton (65/35) Ne 45 per 1000 m of margin lightning From this table, it is clear that as the radius R of the tip 9 increases, the yarn strength and uniformity in the longitudinal direction of the yarn decrease. or,
The incidence of fluff also increases rapidly as the radius R increases. Therefore, the radius R of the tip 9 is 1.0 in terms of the quality of the spun yarn.
Must be less than 1.

In addition, in the device of this embodiment, the inlet portion 3 and the small diameter hole portion 4 are
Since the step part 3a is formed at the connection part with the second,
As shown in Figure 3, inflow from the inlet section 35. A part of the air flow becomes a small vortex near the stepped portion 3a, and due to the action of the vortex, the fibers with one free end that should become binding fibers at both ends of the ribbon-like fiber bundle float up from the center fiber bundle, temporarily. Since the fibers are not twisted together with the central fiber bundle when subjected to the twisting action, the fibers are tightly wound around the central fiber bundle as binding fibers during the untwisting action, further improving the strength of the yarn.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, a stepped portion 3 may be provided at the connection portion between the inlet portion 3 and the small diameter hole portion 4
The inlet portion 3 may be formed in a smoothly connected state without providing the a, the constricted portion 4a may be omitted, or the inlet portion 3 may be formed in a truncated conical shape. Further, in the above embodiment, an example was described in which spun yarn was produced by one nozzle, but as shown in FIG. It may also be applied to a knot spinning nozzle.

Effects of the Invention As detailed above, according to the present invention, the inlet side end face of the binding spinning nozzle can be arranged close to the outer circumferential surface of the front roller, so that the accompanying airflow generated as the front roller rotates at high speed is reduced. has almost no effect on the vicinity of the nozzle inlet, and the fibers with one free end that should become binding fibers that are present at both ends of the fiber bundle supplied in the form of a wide ribbon from the front roller rub against the center fiber bundle. It receives the heating action of the nozzle without being twisted, and during the untwisting action, it is effectively wound around the central fiber bundle as a binding fiber to improve yarn strength. In addition, since the nozzle tip is formed in an arc shape with a small radius, there is no risk of getting caught in the fiber bundle even if it comes into contact with the tip when the fiber bundle is introduced into the inlet, thereby preventing damage to the yarn. There isn't.

In addition, there is an excellent effect that there is no risk of injury to the operator at the tip during nozzle assembly work or maintenance work.

[Brief explanation of the drawing]

1 to 4 show an embodiment embodying the present invention, in which FIG. 1 is a side sectional view, FIG. 2 is an enlarged side sectional view of the main part, and FIG. 3 is an enlarged plane sectional view of the main part. 4 is a view taken from arrow 8 in FIG. 3, FIG. 5 is a sectional side view showing a modified example, and FIG. 6 is a schematic perspective view showing accompanying airflow generated on the nozzle arrangement side of the front roller.

Claims (1)

[Claims] 1. The inlet side end of the binding spinning nozzle arranged behind the pair of front rollers, which are the final rollers of the drafting device, is formed into a shape in which two arcuate surfaces corresponding to the circumferential surfaces of the pair of front rollers are continuous. At the same time, the nozzle for binding and spinning has a tip portion where both arcuate surfaces are continuous and formed into a small arc shape with a radius of 1.0 mm or less.