JP2000110040A - Detection of fluff of multiple running yarns and fluff- detection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for detecting fluff of multiple running yarns in a process for efficiently producing a high-tenacity thread composed of four or more yarns by direct spinning and drawing process at a spinning speed of as high as >=2,000 m/min, capable of detecting the fluff generated by single yarn breakage for each yarn in high accuracy and enabling easy maintenance of a detection apparatus and provide a fluff detection apparatus therefor. SOLUTION: Fluffs are separated from a moving thread 2 composed of multiple yarns by centrifugal force when the moving thread 2 changes the moving direction. The separated fluff is made to collide with the tip part (a) of a fluff detector 13 placed close to and crossing with the moving path 2 of the thread. The apparatus 13 is provided with two or more fluff-detecting tips (a) to enable the separate detection of the fluffs generated on two or more moving yarns at the same time. The fluff detection tips (a) are placed at positions corresponding to individual moving yarns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method and apparatus for accurately detecting the fluff of a running force yarn composed of multiple yarns, that is, a single fiber breakage in a yarn making process. In particular, the present invention relates to an improved method and apparatus for detecting fluff with high accuracy when producing high-strength yarns in an efficient process of multifilament and high-speed yarn production. More specifically, since the fluff of each traveling yarn can be individually detected, it is possible to classify the quality of the product, and it is also useful for pursuing the cause of fluff generation, searching for an improvement method, etc. The present invention relates to a detection method and a detection device.

[0002]

2. Description of the Related Art In recent years, in the field of textiles for industrial materials such as airbags, seat belts and heavy fabrics, rationalization such as partial omission of a weaving preparation process, further speeding up and speeding up of the weaving process has been promoted. ing. That is, non-twisting and non-adhesive warping are generally employed, and warping and weaving are being performed at a speed comparable to that of clothing fibers. For this reason, there has been a strong demand for high-grade fibers for industrial materials suitable for such process rationalization and speeding up.

[0003] Conventional fibers for industrial materials are most important in quality such as high strength, high toughness, and high durability. In the case of problems caused by the mixing of a small amount of fluff, the production efficiency of the high-order process is reduced, It can be said that it has been mastered by closing its eyes on the dignity of the person.

However, in recent years, not only in terms of the quality of fibers for industrial materials, but also ease of use in higher-order processes,
There is an increasing demand for improving the quality of finished products, and there is a need to supply a textile fiber-grade fiber, particularly a yarn having a low fluff level.

[0005] The generation of fluff in industrial material fibers, that is, the occurrence of breakage of single fibers, is likely to occur frequently due to severe drawing heat treatment especially for producing high-strength yarn, and it is extremely difficult to reduce the fluff. is there.

In order to reduce fluff, it is necessary to first investigate the cause of fluff. On the other hand, if any improvement measures are taken, there is a need for a means to evaluate the improvement effects.

[0007] In addition, when the production process capacity of the fiber for industrial materials is not sufficient and does not reach a satisfactory single fiber level, an action such as dividing the product according to the use of the fiber is required.

That is, since the evaluation of fluff is the most important first, there is a need to develop a method and apparatus for detecting fluff that is excellent in accuracy and accuracy and easy to use. Moreover, in recent years, the process for producing fibers for industrial materials has progressed to extremely efficient high-speed and multi-thread processes.
There is a need for the development of a fluff detection method and device that can be used on multifilament running yarns.

As a fluff detecting device conventionally used in a method for detecting a broken single yarn of a running yarn, an optical sensor, a capacitance type sensor, a device for electrically detecting mechanical displacement and the like can be mentioned.

[0010] Among them, an optical sensor and an electrostatic sensor are used as a device for detecting fluff in a warping machine which is a weaving preparation machine, and an optical sensor is generally generally used. This optical sensor is composed of a light emitting unit and a photodiode.
In this method, the aligned yarns are caused to travel between light receiving elements such as a pad, and the amount of received light is detected with and without fluff. Therefore, it is excellent and useful as a fluff detecting device for simultaneously running several hundred or more yarns at a relatively low speed, for example, several hundred m / min or less. However, for optical and electrostatic sensors, 2
The method and the device for detecting the fluff of a yarn running at a high speed such as 000 m / min or more were insufficient.

Therefore, as a method for detecting fluff for a running yarn of high-speed yarn production, a device and a method for detecting fluff mechanically and electrically converting the mechanical displacement to detect the fluff are accurate and have a high accuracy. It has been preferably adopted because of its simplicity.

[0012] As a conventional example of a method and an apparatus for electrically detecting the mechanical displacement of fluff as described above, those described in Japanese Patent Publication No. 52-18819 and Japanese Patent Publication No. 62-261 are known. I have.

The invention described in Japanese Patent Publication No. 52-18819 detects a collision force between a collision object provided above a multifilament running on a roller and a cut single fiber standing upright by centrifugal force. In this method, the collision force is used as an electromotive force, and the electromotive force is amplified and measured. It is also said to include a method of photoelectrically detecting a mechanical displacement due to a collision force.

On the other hand, the invention described in Japanese Patent Publication No. Sho 62-261 is arranged so as to intersect with the running path of the running yarn, approaches the normal running yarn, and contacts the detected fluff of the running yarn. The present invention relates to a fluff detecting device for a running yarn, which includes a vibration detector that detects the vibration of the fluff detecting needle generated by the contact with the fluff detecting needle as the fluff to be detected.

Although these conventional methods and apparatuses are excellent as methods for detecting the fluff of a yarn running at a high speed, there are some disadvantages in practical use as described below.

As one of them, if the running yarn is a yarn forming process of about one or two yarns, it is possible by applying the above-mentioned conventional method and apparatus, but it has recently become the mainstream. In the threading process, more than 4 threads, especially 6,
In the case of eight or more yarns, it is difficult to obtain fluff data for each yarn with the above-mentioned fluff detecting needle, which is inconvenient for use with multiple yarns. When this technique is dared to be adopted, for example, it is used only for the purpose of simultaneously measuring multiple yarns with one detector and knowing the average fluff level of the entire multifilament.

Another disadvantage is that, in the case of the above-mentioned conventional method and apparatus, the detected fluff sometimes winds around the fluff detecting tip portion. In the case of, the detection part is bent,
In addition, since it cannot be restored to the original state, it is difficult to always keep the position of the detection unit with respect to the running yarn constant and set, and there is a problem that the reliability of the measurement data is reduced. At the same time, there is a problem in that the maintenance and management of the detection unit are bothersome, or the replacement cost of the detection part is increased.

Therefore, the above-mentioned drawbacks of the prior art are improved to make the method suitable for a high-speed and multi-filament yarn-making process, and a method and apparatus for detecting fluff of a multi-filament running yarn which is easy to maintain. There was a constant need for development.

[0019]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art.
In the process of efficiently producing high-strength yarns of more than 4 yarns at a high speed of 2,000 m / min or more by direct spinning and drawing, fluff due to single fiber breakage is accurately detected for each running yarn. It is an object of the present invention to provide a fluff detecting method and a fluff detecting device for a running yarn for multiple yarns, which can perform the maintenance of the device easily.

[0020]

Means for Solving the Problems In order to solve the above problems, a method for detecting fluff of a multifilament running yarn according to the present invention mainly has the following configuration. That is, when the traveling yarn composed of multiple yarns changes the traveling direction, the centrifugal force separates the fluff from the traveling yarn, intersects the fluff with the traveling path of the traveling yarn, and Is a method of detecting the fluff by the impact force of the fluff detection tip portion of the fluff detection device arranged in close proximity to the fluff detection device, wherein the fluff generated on each traveling yarn of two or more yarns, A fluff detecting device is used which has a plurality of fluff detecting tips and which is arranged for each of the running threads so as to be individually and simultaneously detectable for each running thread. This is a method for detecting fluff of a multifilament running yarn.

In the method for detecting fluff of a multifilament running yarn according to the present invention, the running yarn is four or more yarns,
Detecting the frequency of fluff of each of these traveling yarns for each traveling yarn or for each of a plurality of traveling yarns; that the traveling speed of the traveling yarn composed of the multiple yarns is 2000 m / min or more; In the traveling yarn comprising the multi-filament yarn, the total fineness of each traveling yarn is 150 denier or more, the number of single fibers is 20 filaments or more, and the yarn strength is 7.0 g / d or more;
And a high-strength yarn having a fineness of 200 denier or more, a single fiber count of 30 filaments or more, and a yarn strength of 8.0 g / d or more in the traveling yarn comprising the multi-filament yarn. However, these are all preferable conditions, and more excellent effects can be expected by applying these conditions.

Further, the fluff detecting device for a multifilament running yarn of the present invention mainly has the following configuration. That is, it is arranged so as to intersect with the traveling path of the traveling yarn composed of multiple yarns,
When the traveling yarn changes its traveling direction, a plurality of fluff detection tips that detect fluff by the impact force of fluff separated from the traveling yarn by its centrifugal force, and are connected to these fluff detection tips. A fuzz detector that converts a fuzz signal generated by collision between each of these fuzz detection tips and the fuzz of the running yarn into an electric signal, a comparator that converts the electric signal generated by the fuzz detector into a pulse signal, and A fluff detection data processing device for processing the pulse signal data, wherein the fluff detector is brought close to the front of the yarn path changing roller, and each of the fluff detection tips is moved along the respective running direction. A fluff of a multi-filament running yarn, wherein the fluff is arranged so as to intersect with the running path of the yarn in correspondence with each yarn so that fluff generated for each of the running yarns can be detected. With the detection device That.

In the fluff detecting device for a multifilament running yarn according to the present invention, the fluff detecting tip has a needle shape, a rod shape,
It has any cross-sectional shape selected from hollow rod, plate, triangular, and hollow square, and has any tip shape selected from T-shaped, round, triangular, and hook-shaped The bending stiffness of the fluff detection tip is 2.0 Nm or more;
A bending deformation strength (bending moment resistance) at a connecting portion between the fluff detecting tip and the fluff detector is 1.0 Nm or more, and a length of the fluff detecting tip is a running yarn. It is a preferable condition that the length is longer than the sum of the width and the yarn sway width and shorter than the interval between the adjacent running yarns, and more excellent effects can be expected by applying these conditions. .

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fluff detecting method and a fluff detecting device of a multifilament running yarn of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a schematic view of a general multifilament spinning and drawing process, and FIG. 2 is an enlarged side view of a part A of FIG. 1 showing a side view of a fluff detecting device for multifilament running yarn of the present invention. 3 is a plan view of FIG. 2, FIG. 4 is a cross-sectional view showing a cross-sectional shape of a fluff detecting tip portion in the fluff detecting device for a multifilament running yarn of the present invention, and FIG.
FIG.

FIG. 1 shows a general multi-filament spinning and drawing process, for example, an eight-filament spinning and drawing process.
Running yarn 2 protected from eight spinnerets (not shown)
After passing through the spinning duct 1, an oil agent is applied by an oil supply device 3 provided in each of the spinning ducts 1, is stretched through a converging guide 4 and a roller 6, and is wound by a winding device 12.

In the case of multifilament stretching, for example, in order to guide eight yarns to one roller 6, a turn guide 5 is provided so that the yarns can be separated and wound by the rollers 6. In addition, for the same purpose, the spinneret may be arranged in advance not substantially in a line with respect to the arrangement direction of the prevention device but in a substantially parallel manner.

The traveling yarn 2 passing through the roller 6 is
First stretching rollers 7A, 7B, second stretching rollers 8A, 8
B, third stretching rollers 9A, 9B and fourth stretching roller 1
After multi-stage stretching between 0A and 10B and heat treatment as required, the running direction is reversed by the yarn path changing rollers 11A and 11B, and the winding is performed by the winding device 12.

A preferred yarn making process to which the method for detecting fluff of a multifilament running yarn of the present invention is applied is as follows.

That is, as a method of detecting the fluff of the multifilament running yarn, when the running yarn changes its running direction, the running yarn is separated from the running yarn by centrifugal force. A method in which the fluff is detected by a collision with a fluff detecting tip of a fluff detecting device disposed to intersect and approach a running path of a yarn, wherein each running of two or more yarns is performed. A plurality of fluff detecting tips are provided so that fluff generated on the yarn can be individually and simultaneously detected for each traveling yarn, and these fluff detecting tips are arranged for each of the traveling yarns. That is, a fluff detecting device is used.

When the traveling yarn changes the traveling direction, the traveling yarn 2 is connected to each of the stretching rollers 7A, 7B, 8 in FIG.
A, 8B, 9A, 9B, 10A, 10B, a yarn path changing roller (guide roller) wound around a heat treatment roller (not shown), a tension adjusting roller, or the like, or installed between rollers or between a roller and a winding machine. 11 means a part for changing the traveling direction.

Usually, a roller installed immediately before the winding machine, for example, a yarn path changing roller 11 or a tension adjusting roller 14
It is preferable to install it immediately after the yarn is wound around A and 14B. In FIG. 1, the fluff detecting device 13 is arranged close to the portion A, that is, the yarn path changing roller 11.

In the case of multi-filament yarn production of four or more yarns, when winding is performed by dividing the yarn into two or more winders, the yarn passes through guide rollers for distributing the yarns to the respective winders, Immediately after changing the direction of the running yarn, the fluff detecting device 13
Is preferably installed.

The angle (contact angle) at which the running direction of the running yarn 2 is changed may be an angle sufficient to separate the running yarn 2 from the fluff, and the speed of the running yarn, the number of single fibers, the single fiber Fineness,
What is necessary is just to adjust suitably according to the material of a single fiber, the cross-sectional shape of a single fiber, the rigidity of a single fiber, etc. Usually, it is preferable to set the angle to about 30 degrees or more.

Next, the fluff detecting device for a multifilament running yarn of the present invention will be described more specifically.

As shown in FIGS. 2 and 3, the fluff detecting device 13 of the multifilament running yarn of the present invention is disposed so as to intersect with the running path of the multifilament running yarn 2. When the traveling yarn 2 changes the traveling direction, a plurality of fluff detection tips a for detecting the fluff 2 'by the impact force of the fluff 2' separated from the traveling yarn 2 by the centrifugal force, and the fluff detection Each of these fluff detection tips a is connected to the tip a.
Detector b for converting a fluff signal generated by collision between the fluff 2 and the fluff 2 'of the running yarn 2 into an electric signal, and a comparator d for converting the electric signal generated by the fluff detector b into a pulse signal
And a fluff detection data processing device e for processing the pulse signal data.

Then, the fluff detector b is connected to the yarn path changing roller 1.
1 and the fluff detection tips a are arranged so as to intersect with each traveling yarn 2 so as to be able to detect the fluff 2 ′ generated for each traveling yarn 2. It is.

That is, as shown in FIG. 2, when the running direction of the yarn 2 traveling at high speed is changed by the yarn path changing rollers 11A and 11B, the fluff 2 'running simultaneously with the yarn 2 In other words, one of the broken single fibers is a single fiber that has been cut for some reason in the spinning process, and its cut end faces the yarn running direction, and the portion 2 ′ is separated from the yarn 2 by centrifugal force. , And travels in the yarn running direction while drawing a large arc. At this time, the separated fluff 2 'collides with the fluff detecting tip a of the fluff detector b of the fluff detecting device 13 installed according to the present invention, and the presence or absence of fluff is detected by the collision force. It becomes possible.

The fluff detecting tip a is attached to a fluff detector b for detecting a fluff signal, and the fluff detecting tip a and the fluff detector b are connected at a connecting portion c. It is fixed to a part with a fixing screw or an adhesive.

As the fluff detector b, for example, a commercially available detection head GH213 manufactured by KEYENCE CORPORATION can be used.
Such a vibration detector can be used.

The fluff detector b which has detected the fluff signal is connected to a comparator d, in which the electric signal from the fluff detector b is converted into a pulse signal.

The comparator d sets a threshold value for the electric signal, and generates a pulse signal when the electric signal exceeds the threshold value.

Next, the converted pulse signal is sent to the fluff detection data processing device e, and the generation of fluff 2 'for each yarn 2 is measured.

The fluff detector b and the fluff detecting tip a are each provided with a number corresponding to the number of multi-filament running yarns.
Are arranged in parallel in accordance with the distance between the running yarns, so that each fluff detecting tip a is substantially perpendicular to the turn portion of each running yarn by the yarn path changing guide 11, and is located at a required interval from each running yarn 2. Installed in

Fuzzy detecting device 1 for multifilament running yarn of the present invention
3 needs to have a function of detecting the fluff of running yarns of two or more yarns, preferably four or more yarns, for each yarn and at the same time. Since the tip portion a is preferably more compact, the entire fluff detecting device is configured as an integrated set. The processing devices d and e for the single fiber breakage signal process data for each running yarn 2, but a single processing device simultaneously processes multiple yarns, or further processes other yarns. It can also be processed together.

In the above description, the distance between the running yarn 2 and the fluff detecting tip a is preferably about 0.5 mm to 20 mm. If this interval is too small, the normal running yarn comes into contact with the fluff detecting tip a, so that a normal fluff state cannot be detected. On the other hand, if the interval is too wide, detection of small fuzz may occur, which is not preferable.

Further, by increasing the portion of the yarn path changing roller 11 where the traveling yarn 2 changes the traveling direction, that is, by increasing the yarn interval of the fluff detector b, at least each traveling yarn 2
Must be wider than the swing width of each running yarn 2,
Usually, it is preferably at least four times, preferably at least six times the width of each running yarn 2.

On the other hand, a sufficient distance between the running yarns 2 is advantageous from the viewpoint of easy detection of yarn breakage. It is not preferable because the merit as equipment is lost. Therefore, it is preferable to design near the lower limit or more.

In the multi-filament yarn making process, the number of single fiber breaks, that is, the number of fluffs increases, corresponding to the increase in the number of yarns, and the number of the fluff detecting tip portions a and fluff detecting portions b to be arranged. So that the broken single fiber filament wrapped around the fluff detecting tip a is not wrapped, and as a result, the single fluff detector b and the fluff detecting tip a connected thereto are not bent or damaged. Is required. That is, it is important that the fluff detection tip a be formed in such a shape that the filament that has been cut out of a single fiber is difficult to wind, and that the fluff detection tip a has such strength that it does not bend or be damaged even if wound.

For this reason, the fluff detecting tip a for detecting fluff, that is, the tip of portion B in FIG.
As shown in the above, any cross-section selected from needle-like (a), rod-like (b), hollow-rod-like (c), plate-like (d), triangular (e), and hollow-horn (f) Having a shape and T
Shape (I), Round (II), Triangle (III) and Hook (I
It is preferable to have any of the tip shapes selected from V).

Further, a fluff detecting tip a for detecting fluff
Regardless of the shape, the length must be longer than the sum of the yarn width and the yaw width of the traveling yarn and shorter than the distance between adjacent traveling yarns as described above.

The fluff of the target running yarn is surely captured,
Further, it is necessary to provide a dimension of the fluff detecting tip a which does not detect fluff of other yarns. Therefore, the length of the fluff detecting tip a is not less than the width of the traveling yarn a and less than four times, preferably less than six times the width of the traveling yarn.

The bending stiffness of the fluff detecting tip a is 2.
The bending deformation strength (bending moment resistance) at the connecting portion c between the fluff detecting tip a and the fluff detector b is 1.0 Nm or more. This is preferable in that it can be maintained and its damage can be prevented.

The material of the fluff detecting tip a is preferably made of a resilient metal such as a piano wire, but is not particularly limited as long as it has the above function.

The multifilaments to be covered by the present invention are a direct spinning and drawing process of two or more, preferably four or more, more preferably six or more.

That is, the present invention relates to the production of multifilament fibers for industrial materials such as polyamide, polyester, polyethylene, polypropylene, polyvinyl alcohol, polyaramid and polyphenylene sulfide at a high speed of 2000 m / min or more, preferably 300 m / min or more.
It is useful for a process of producing yarn at a high speed of 0 m / min or more and efficiently producing multi-filament yarns of 2 or more yarns, preferably 4 or more yarns.

The fibers for industrial materials have high strength, high toughness,
In order to achieve high durability, and especially important high strength,
Since the yarn is formed by the high-magnification stretching heat treatment, the single fiber is easily cut. However, especially for textiles, streamlined warping, efficiency and yield improvements in the weaving process and airbags,
It is an important issue to minimize the quality of final products such as seat belts and heavy fabrics, and in particular, to minimize defects caused by fluff of the original yarn (break of single fiber). Therefore, the present invention is particularly suitable for high-strength textile yarns, specifically, fineness is 150 denier or more,
The number of single fibers is 20 filaments or more, and the strength is 7.0 g / d.
Or more, preferably 200 denier or more, and the number of single fibers is 30
It is extremely useful as a method and an apparatus for detecting a fluff of a high-strength yarn having a strength of 8.0 g / d or more than a filament.

The method and apparatus for detecting fuzz of the present invention can be used for fibers having a fineness of less than 150 denier, a number of single fibers of less than 20 filaments and a strength of less than 7.0 g / d. Since the frequency of the fluff is extremely low, the usefulness of the fluff data obtained in this case is relatively small.

In other words, the higher the strength and the number of filaments, the more abundant fluff data can be obtained, and the effect of the present invention can be effectively exhibited.

By employing the fluff detecting method and the fluff detecting device of the multifilament running yarn according to the present invention, the single fiber breakage information for each running yarn can be obtained with high accuracy, and the cause of the single fiber breakage is investigated. In addition, the action for improving the breakage of single fiber can be taken early, and it can contribute to the improvement of the quality and quality of the fiber for industrial materials.

Further, when some single fiber breakage occurs regularly, it can be used as a method of classifying products according to the frequency level of single fiber breakage.

Further, as another effect, as compared with the conventional fluff detecting device, the single fiber has a shape in which the single fiber is hardly wound around the single fiber break detecting portion, and the fluff detecting tip portion is bent by the wound single fiber. It is easy to maintain because it has a strength that is hard to be damaged or damaged.

[0063]

Next, the contents of the present invention will be described more specifically with reference to examples.

Example 1, Comparative Examples 1 to 3 Nylon 66 chips having a sulfuric acid relative viscosity of 3.7 were melt-spun at 295 ° C. by an extruder type spinning machine. The base diameter is 0.3mm
The one in which two groups of 68 holes were arranged at φ was used. Eight yarns were spun from the four spinning packs having the spinneret, and a 420 denier, 68 filament nylon 66 raw yarn for airbag was produced by a direct spinning and drawing process.

That is, a pre-stretch-two-stage stretching heat treatment-relaxation process, that is, passing through an oil supply roller, a spinning take-up roller, a yarn supply roller, a one-stage stretching roller, a two-stage stretching / heat treatment roller, and a tension adjusting roller in order, After relaxing the 8 yarns at the same time, it is divided into 4 yarns at a time and 5100m with 4 cup type winder
/ Min.

In this case, the running yarn that passed through the relax roller changed the running direction of the yarn with a rotating roller installed above the winding machine, and was changed by a fluff detecting device of the type shown in Table 1 immediately after the direction change. The fluff of each running yarn was measured.

Here, the method of the fluff detecting device of the present invention is as described above, and the setting conditions are as follows. 1. Fluff detector: KEYENCE CORPORATION: Detection head GH
213, shock sensor GA-245 Cross-sectional shape size of fluff detecting end: rod shape (diameter 0.8m
m), tip shape: T type (length 12 mm) Distance between running yarn and detection end: 3 mm.

In the case of the conventional detection on the straight running yarn (Comparative Example 1), when the detection is performed by the single yarn type fluff detector (Comparative Example 2), the detection of the fluff of the multi-filament running yarn according to the embodiment of the present invention. Table 1 shows the results of comparing the advantages and disadvantages of the method and apparatus (Example 1) and the fuzz detection method and apparatus that do not satisfy the conditions of the present invention (Comparative Example 3).

The bending moment and the bending deformation strength in Table 1 each indicate the strength of the fluff detecting tip.
The bending of the detection tip indicates the presence or absence of the bending on each scale of ○: no, ×: present, and the connection durability indicates the stability of the connection between the fluff detection tip and the fluff detector. ○: stable,
X: It is shown on each scale of instability.

The detection accuracy indicates the detection result of each method as a degree of matching (%) with the number of fluffs detected manually.

[0071]

[Table 1] As is evident from the results in Table 1, the use of the fluff detecting method and the fluff detecting device for the multifilament running yarn of the present invention makes it possible to achieve desired functions and facilitate maintenance and maintenance.

[0072]

As described above, by employing the method for detecting fluff of a multifilament running yarn and the fluff detecting device according to the present invention, single fiber breakage information for each running yarn can be obtained with high accuracy. Therefore, the cause of the single fiber breakage can be easily determined, and the action of improving the single fiber breakage can be taken at an early stage, which can contribute to the improvement of the quality and quality of the fiber for industrial materials.

Further, when some single fiber breaks occur regularly, it can be used as a method of classifying products according to the frequency level of single fiber breaks.

Further, as compared with the conventional fluff detecting device,
The single fiber has a shape that makes it difficult for the single fiber to wind around the single fiber break detector,
In addition, since the wound single fiber has such a strength that the fluff detecting tip and the like are hardly bent or damaged, maintenance management is easy.

[Brief description of the drawings]

FIG. 1 is a schematic view of a general multifilament spinning and drawing process.

FIG. 2 is an enlarged side view showing an example of a fluff detecting device for a multifilament running yarn of the present invention.

FIG. 3 is an enlarged plan view showing an example of a fluff detecting device for a multifilament running yarn of the present invention.

FIG. 4 is a cross-sectional view showing an example of a cross-sectional shape of a fluff detecting tip in the fluff detecting device for a multifilament running yarn of the present invention.

FIG. 5 is a side view showing an example of a side shape of a fluff detecting tip portion in the fluff detecting device for a multifilament running yarn of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinning duct 2 Running yarn 3 Lubricating device 4 Convergence guide 5 Turn guide 6 Roller 7A, 7B 1st drawing roller 8A, 8B 2nd drawing roller 9A, 9B 3rd drawing roller 10A, 10B 4th drawing roller 11A, 11B Yarn Road changing roller 12 Winding device 13 Fuzz detection device 14A, 14B Tension adjusting roller a Fuzz detection tip b Fuzz detector c Connecting portion d Comparator e Fuzz detection data processing device

Continued on the front page F term (reference) 3B154 AB02 BA53 BA55 BA60 BB08 BB47 BB54 BB72 BB77 BC22 BC42 BC48 BF07 BF14 BF18 CA18 CA22 DA21 4L056 AA00 EA04 EA06 EA10 EA29 EA32 EA49 FB12

Claims (9)

[Claims] When a traveling yarn composed of multiple yarns changes the traveling direction, the centrifugal force causes the fluff to separate from the traveling yarn, intersects the fluff with the traveling path of the traveling yarn, and A method of colliding with a fluff detecting tip of a fluff detecting device arranged close to the traveling path and detecting fluff by the collision force, which is generated on each traveling yarn of two or more yarns. In order to detect fluff individually and simultaneously for each running yarn, a fluff detecting device having a plurality of fluff detecting tips and arranging these fluff detecting tips for each running yarn is used. A method for detecting fluff of a multifilament running yarn. 2. The method according to claim 1, wherein the number of the traveling yarns is four or more, and the fluff of each traveling yarn is detected for each traveling yarn or for each of a plurality of traveling yarns. 2. The method for detecting fluff of a running yarn for multifilaments according to 1. 3. The traveling speed of the traveling yarn comprising the multi-filament yarn is 2000 m / min or more.
Or the fluff detection method of the running yarn for multifilaments according to 2. 4. The running yarn comprising the multi-filament yarn has a total fineness of at least 150 denier and a single fiber count of 2 or more.
The method for detecting fluff of a running yarn for a multi-yarn according to any one of claims 1 to 3, wherein the filament has a strength of 0 g or more and a filament of 7.0 g / d or more. 5. The running yarn composed of the multi-filament yarn has a total fineness of at least 200 denier and a single fiber count of 3 or more.
The method for detecting fluff of a running yarn for a multi-yarn according to any one of claims 1 to 4, wherein the yarn is a high-strength yarn having a filament of 0 filament or more and a yarn strength of 8.0 g / d or more. . 6. A fluff which is disposed so as to intersect with a traveling path of a traveling yarn composed of multiple yarns, and which is separated from the traveling yarn by centrifugal force when the traveling yarn changes its traveling direction. A plurality of fluff detection tips that detect fluff by a collision force, and the fluff detection tips are connected to the fluff detection tips, and a fluff signal generated by a collision between each of the fluff detection tips and the fluff of the running yarn is converted into an electric signal. A fuzz detection device comprising: a fuzz detector for converting; a comparator for converting an electric signal generated by the fuzz detector into a pulse signal; and a fuzz detection data processing device for processing the pulse signal data. A device is arranged near the front of the yarn path changing roller, and each of the fluff detection tips is disposed so as to intersect the yarn traveling path corresponding to each of the traveling yarns. Hair generated every time A fluff detecting device for a multifilament, wherein the fluff is configured to be detectable. 7. The fuzz detection tip has a cross-sectional shape selected from a needle shape, a rod shape, a hollow bar shape, a plate shape, a triangular shape and a hollow square shape, and is T-shaped, round, The fluff detecting device for a multifilament running yarn according to claim 6, wherein the device has a tip shape selected from a triangular shape and a hook shape. 8. The bending stiffness of the fluff detecting tip is 2.0.
8. The multifilament according to claim 6, wherein a bending deformation strength (bending moment resistance) at a connecting portion between the fluff detection tip portion and the fluff detector is 1.0 Nm or more. 9. Fluff detecting device for running yarn. 9. The fluff detection tip portion according to claim 6, wherein the length of the fluff detecting tip is longer than the sum of the yarn width and the yaw width of the traveling yarn and shorter than the distance between adjacent traveling yarns. The fluff detecting device for a multi-filament running yarn according to any one of claims 1 to 8.