JP2003301369A - Method for detecting fuzz of traveling yarn and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuzz detector which has a shape scarcely interfering a threading work and hardly breaks a fuzz-detecting tip portion at the breakage of a yarn and can detect fuzz, even when the fuzz is not separated by a centrifu gal force. <P>SOLUTION: This fuzz detector is characterized by detecting the fuzz developed on a traveling yarn with a fuzz-detecting means disposed above a yarn guide. Specifically, the fuzz-detecting means is disposed above the yarn guide to surround the circumferential direction of the yarn Y, is inboard supported, and transmits the vibration of the fuzz contacted with the fuzz-detecting means to a vibration detector, whereby the fuzz and loops developed on the traveling yarn can be detected. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluff detecting method and apparatus capable of accurately detecting fluff generated on a yarn running at high speed in a yarn making process online.

[0002]

2. Description of the Related Art In recent years, in the manufacturing process of synthetic fibers such as polyester fiber and polyamide fiber, particularly in the manufacturing process of fibers for industrial materials such as tire cords, seat belts and airbags, the spun yarn is once wound. Instead, a direct spinning and drawing method of directly drawing is widely used.

In such a yarn making process, on the other hand, the yarn making speed is increased to 2000 m / min or more, and
On the other hand, harsh drawing heat treatment is required to produce high quality yarns such as high tenacity, high toughness and high durability. For this reason, single fiber breakage (fluff) is likely to occur due to severe and high-speed drawing heat treatment.

The generation of such fluff not only deteriorates the production process, but also causes a problem in terms of quality as a fiber for industrial materials. In addition, when the raw yarn produced in this way is subjected to a higher-order processing step for finishing into a final product such as a tire cord, a seat belt, an airbag,
There are often problems in handling.

Therefore, in the case where fluff occurs frequently, it is necessary to investigate the cause and take measures to reduce the fluff as quickly as possible in the process for producing the fluff-producing raw yarn. . From this point of view, when fluff is generated, a fluff detector for immediately monitoring the occurrence of fluff is required.As such a conventional fluff detector, in the manufacturing field of synthetic fibers, mainly electrostatic discharge is required. A non-contact type fluff sensor using a capacitive sensor and an optical sensor has been used.

Here, the non-contact type fluff sensor will be briefly described. The former one using the electrostatic capacitance type sensor forms a cylindrical electrostatic capacitance detection sensor through which a yarn passes. However, a change in the capacity of the yarn caused by the generation of fluff is captured as a change in the electrostatic capacity. In the latter one using the optical sensor, the light receiving section provided with a light receiving element such as a photodiode and the light projecting section are provided so as to face each other with a thread running therebetween, and fluff occurs in the running thread. It detects the change in the light amount when the light is turned on and off.

However, in such a conventional non-contact type fluff sensor, when the traveling speed of the yarn is slow, there is little problem in reproducibility and accuracy of measurement, but the traveling speed of the yarn is, for example, 2000 m. If the speed is increased to more than 1 minute, there will be a problem in the measurement accuracy.

In addition, it is difficult to adjust the sensitivity, and the mounting position and the operating environment are restricted (it cannot be used in a place where there is a lot of dust or where it is covered with oil). However, there is a problem that it is difficult to maintain a constant value at all times, and the current situation is that the management after installation is not successful and it cannot be fully utilized.

Therefore, instead of the non-contact type fluff detector as described above, Japanese Patent Publication No. 52-18819 and Japanese Unexamined Patent Publication No.
No. 00-199167 or Japanese Patent Publication No. 62-26
As proposed in Japanese Patent Publication No. 1 and the like, it has been considered to use a contact type fluff detector that detects fluff by directly contacting the fluff generated on the yarn with a fluff detection probe.

The conventional techniques will be briefly described. First, the fluff detector proposed in Japanese Examined Patent Publication No. 62-261 has a speed of about 4 m / sec as described in the embodiment. It is effective for surely detecting the fluff generated on the yarn running at a low speed. However,
In this technology, it is necessary to provide a fluff detection needle for contact detection of fluff in the vicinity of the traveling yarn, and if a yarn breakage occurs in the yarn traveling at high speed, the yarn end hits the fluff detection needle and the fluff detection needle is detected. There is a problem of bending and breaking. Furthermore, it is very dangerous when it breaks and flies around, and the higher the speed, the greater the danger.

Further, according to this technique, the fluff is well detected when the fluff is not too loose from the yarn main body or when the loose position of the fluff is opposite to the installation direction of the fluff detecting needle. There is a problem that you can not.
In particular, in a yarn traveling at high speed, this problem is serious because the yarn passes through the installation portion of the fluff detection needle in an instant.
Therefore, the fluff detection needle is not installed straight in the vicinity of the traveling yarn as proposed in the above publication, but
It is necessary to provide it around the traveling yarns, and the above-mentioned dangers are further increased in this respect as well.

For the contact type fluff detector which is effective in this low speed region, Japanese Patent Publication No. 52-18819 and Japanese Patent Laid-Open No. 2000-2000.
There is a contact type fluff detector that can detect fluff even in a high speed region proposed in Japanese Patent Publication No. 199167. The technologies described in these publications utilize centrifugal force generated when a yarn traveling at high speed changes its traveling direction, and separate the fluff from the yarn main body by the centrifugal force, and release the fluff. This is a technique for causing the detection end to collide and detecting the impact force generated at the time of the collision. According to this technique, the direction of the loose fluff becomes the direction of action of the centrifugal force, and the fluff detection end can be provided at this portion.
It is possible to solve the problem of the technique described in Japanese Patent Publication No.

By the way, according to the techniques proposed in Japanese Patent Publication No. 52-18819 and Japanese Patent Application Laid-Open No. 2000-199167, in order to obtain a centrifugal force for releasing the fluff from the yarn main body, the traveling direction of the yarn is It is necessary to combine with equipment for generating centrifugal force, such as rollers for changing the. Moreover, in order to accurately detect the fluff released from the yarn main body, it is necessary to install the fluff detection end extremely close to these devices.

However, if it is indispensable to provide the fluff detecting end and the roller in close proximity to each other as described above, these devices may become obstructed when the yarn is hooked on the device at the time of cutting the yarn or starting the yarn producing device. Also, the broken yarn end may be wound around the roller or the fluff detection end. For this reason,
The risk problem as pointed out in Japanese Patent No. 61 is still unsolved by this technique.

Furthermore, in this technique, the installation position of the fluff detection end also needs to be provided as a set with a roller or the like, so that the installation position is significantly limited. Therefore, there is a problem that such a technique cannot deal with the situation where a large number of fluffs occur on the downstream side after the installation position of the fluff detection end.

Furthermore, since these techniques essentially require changing the traveling direction of the yarn to obtain a centrifugal force, the fluff can be satisfactorily detected for the yarn traveling straight. It goes without saying that it has a fundamental problem that is difficult.

[0017]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. That is, there is little hindrance to the yarn hooking work, and the fluff detection tip portion is not easily damaged at the time of yarn breakage, and the fluff can be detected without separating the fluff by centrifugal force, and the installation position thereof is not limited, either. It is to provide a fluff detection device that can be installed at any position.

[0018]

The above objects can be achieved by the device and method of the present invention described below. That is, as a method for detecting the fluff of the running yarn of the present invention, "2000 m /
In a method for detecting fluff generated in a multifilament yarn traveling at a high speed of more than a minute, the yarn path of the yarn is restricted to a straight track so that the traveling direction of the yarn does not change,
The contact sensing member for contacting the fluff generated on the running yarn on the regulated yarn path is in a non-contact state with the yarn main body, but forms a state in which it is in contact with the fluff generated on the yarn. And a fluff detecting method for a traveling yarn, which detects that the fluff comes into contact with the contact sensing member.

At this time, in the method of the present invention, it is preferable that the contact sensing member has a plate-like shape, and furthermore, the filaments constituting the multifilament yarn are entangled with each other, and the entangled yarn is obtained. Leading to the contact sensing member is preferable for good detection of fluff generation. In addition, such a method is preferably used in the step of directly spinning and drawing the fiber for industrial materials.

Next, as the running yarn fluff detecting device of the present invention, "a yarn path regulation guide for regulating the yarn path of the traveling yarn to a constant straight path, the fluff generated on the yarn comes into contact. A travel including a contact sensing member provided in the middle of the yarn path on the upstream side of the yarn path regulation guide while maintaining a distance so as not to contact the yarn main body, and a fluff contact detector connected to the contact sensing member. A yarn fluff detection device "is provided.

At this time, the device of the present invention is preferably provided with a supporting member for supporting the contact sensing member. Further, the contact sensing member comes into contact with the fluff, but the yarn main body. It is preferable that the plate-shaped member is provided with an opening that does not contact with.

Further, it is preferable that the member connecting the contact sensing member and the fluff contact detector is a linear member,
It is preferable that the fluff contact detector includes a vibration detection sensor that detects a vibration generated when the fluff comes into contact with the contact sensing member via the linear member.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The process for producing synthetic fibers by the direct spinning and drawing method, to which the present invention is preferably applied, will be described in detail below with reference to the drawings. The device will be described in detail.

FIG. 1 is a schematic explanatory view illustrating a yarn making process to which the apparatus of the present invention can be suitably applied. In FIG. 1, 20 is a spin block, 21 is a spin pack, 22 is a spinneret, 23 is a heating cylinder, 24 is a heat insulating plate, 25 is a cooling air spinning cylinder, 26 is a cooling cylinder, 27 is an oil agent applying device, and 28 is The take-up roller and 29 represent the first entanglement imparting device, respectively, which constitute the spinning device 2 in the melt spinning process.

Reference numerals 301 to 304 each denote a pair of heating / drawing rollers, and these heating / drawing rollers 301
The stretching roller group 30 is constituted by ˜304. Further, 31 is a treatment agent applying device, and 32 is a second entanglement applying device, respectively, and these constitute the stretching device 3 in the stretching step. In addition, 4 is a winding machine for winding up the multifilament yarn Y finally obtained through the spinning process and the drawing process.

In the direct spinning and drawing step described above,
The fluff detection method and apparatus of the present invention can be installed at any position without significantly limiting the installation position unlike the conventional methods and apparatuses. However,
The fluff detection method and device of the present invention are the second entanglement imparting device 3
It is preferable to provide it between 2 and the winder 4. Because fluff is also generated in the second entanglement imparting device 32, in order to monitor the fluff generation in all the processes, the fluff is generated at the final stage of the yarn making process (immediately before the winding machine 4). This is because it is preferable to detect the occurrence of

The steps for applying the method and apparatus of the present invention will be described below in order from the melt spinning step. First, in a melt spinning step, a polymer such as polyester is first melted by a conventional method using a melt extruder (not shown), and a spinning pack 21 mounted on a pack dome of a spin block 20 by a metering means such as a gear pump. Send the polymer to. Then, the melted polymer is continuously discharged in a fixed amount from the polymer discharge hole group of the spinneret 22 provided in the spin pack 21.

Then, by heating the surface of the spinneret 22 with a heating cylinder 24 provided immediately below the spinneret 22, a delayed cooling control for delaying the cooling of the spun synthetic fiber yarn Y is performed. Then, the cooling air is blown from the cooling spinning tube 25 onto the spun yarn Y in the direction of the arrow in the figure, and once cooled to the glass transition temperature or lower.

After that, after the spinning agent is applied to the cooled yarn Y by the oil agent applying device 27, it is taken up by the take-up roller 28, and if necessary, the first air nozzle 2
At 9, the first-stage entanglement treatment for entangling the single fibers with each other is performed on the single fiber group forming the multifilament yarn Y.

The yarn Y melt-spun in this way is composed of a pair of heating rollers in which the stretching roller groups 30 are arranged in multiple stages (four stages in this example).
It is guided to the fourth stretching rollers 301 to 304 and is subjected to a stretching step of performing multi-stage stretching between the stretching roller groups 30.

At this time, the yarn Y guided to the stretching roller group 30 has a sufficient length of time for the yarn Y to come into contact with the stretching rollers 301 to 304, so that these stretching rollers 301 to 304 can be secured. It is wound several turns to 20 turns. Then, in this way, the yarn Y heated by the stretching roller group 30 has the stretching rollers 301 of each stage.
The stretch ratio is stretched to a predetermined stretching ratio in the range from ~ 304. In this example of the yarn making process, the treatment agent applying device 31
Is provided at the illustrated position between the third-stage stretching roller 303 and the fourth-stage stretching roller 304.

The yarn Y drawn by the drawing roller group 3 in this way is finally subjected to the entanglement treatment by the second air nozzle 32, and then, in the winder 4 through the fluff detector 1 of the present invention. Roll up.

Next, a method for detecting the fluff generated on the yarn Y in the above-described spinning direct drawing step will be described in detail with reference to FIG. 2A and 2B are schematic explanatory views illustrating the outline of the fluff detection device of the present invention. FIG. 2A is a front view, and FIG. 2B is a partial X of the front view.
FIG. 6 is a side view showing a partial cross section as viewed from the −X ′ arrow.

In FIG. 2, reference numeral 1 denotes a fluff detecting device main body of the present invention. The main body 1 is a yarn guide regulation guide 10, a contact sensing member 11, a contact force transmitting member 12, a fluff contact detector 1.
3, support member 14, main body fixing member 15, protection member 16,
Then, the fixing tool 17 and the like are included.

Here, the yarn guide restricting guide 10 plays a role of restricting the yarn path of the traveling yarn Y to a constant straight track, and further, the yarn passing through an opening provided in the contact sensing member 11. It also serves to maintain the Y yarn path at a fixed position.

The yarn guide regulation guide 10 and the contact sensing member 11 are fixed to a common support member 14 as shown in the figure. Therefore, although the contact sensing member 11 for contacting the fluff generated on the traveling yarn Y on the yarn path regulated by the yarn path regulation guide 10 is not in contact with the yarn body, it occurs on the yarn Y. It is possible to reveal a state in which the fluff comes into contact with the fluff.

At this time, the contact sensing member 11 maintains a constant distance from the yarn guide regulating guide 10 and avoids the propagation of a strong impact force to the yarn guide regulating guide 10. It is preferable to insert an elastic body such as a vibration-proof rubber as a spacer between the support member 14 and the fixing member 17 such as a hexagon socket head cap screw. The protective member 16 plays a role of a protective cover for preventing the broken yarn end from winding around the main body of the fluff detecting device 1.

Further, it is preferable to provide a fluff contact detector 13 via the contact force transmitting member 12 to the contact sensing member 11 formed of a plate-like material. This is because, if the contact sensing member 11 is a plate-shaped member, an opening having a planar spread surrounding the yarn Y should be provided regardless of the direction in which the fluff comes out from the yarn Y main body. This is because the fluff can be surely brought into contact with the plate-shaped material.
On the other hand, it goes without saying that such a linear fluff detecting needle as in the prior art disclosed in Japanese Patent Publication No. 62-261 cannot detect such contact of fluff in substantially all directions. .

Further, as described above, even if the thread ends cut by using the plate-like material collide at high speed, the linear material is not held in a cantilever manner as in the prior art, but the plate-like material is used in the present invention. Since it is possible to support the periphery of the material, it is possible to avoid the situation where the contact sensing member 11 is damaged.

In the present invention, the yarn path of the yarn Y is regulated by the yarn path regulation guide 10 so that the traveling direction of the yarn Y does not change in a straight path. Therefore, even if the yarn breakage occurs, the yarn end of the broken yarn Y can go straight as it is and smoothly pass through the fluff detection device 1, so that the yarn has an advantage that it is difficult to wind around the device body.

Further, in the present invention, the contact sensing member 11 is already supported by the support member 14, and the fluff contact detector 13 is further provided from the contact sensing member 11 via the contact force transmitting member 12. Connected to. For this reason,
Even if a large impact occurs, the impact force can be received by the support member 14 that supports the contact sensing member 11. For this reason, a large force is not directly applied to the fluff contact detector 13 having a delicate sensor for detecting the contact force. Therefore, also in this respect, the problem of equipment damage can be avoided.

On the contrary, since the small fluff generated on the yarn Y is sensitive to the slight contact force generated by contacting the contact sensing member 11, the contact force transmitting member 12 has a thin rigidity. It is preferable to use a linear material having a large diameter.
This point will be described with reference to FIG. 2, which illustrates an embodiment of the present invention. In the contact sensing member 11, thin and rigid contact force transmission members 12 and 12 are branched into two linear members. The two linear members 12, 12 are connected to each other.
In the portion 2a, one thin and rigid linear member is united and connected to the fluff contact detector 13.

By doing this, on the one hand,
As shown in the figure, the plate-like contact sensing member 11 is not easily damaged.
Detects the collision of the fluff on the other hand, and propagates the collision force through the contact force transmission member 12 made of a rigid linear material that does not cause the collision of the fluff to collide with the contact sensing member 11. The impact force generated on the fluff can be indirectly and satisfactorily propagated to the fluff contact detector 13.

Thus, on the one hand, the contact sensing member 11 is made of a plate-like material as described above to avoid the risk of breakage, and on the other hand, it is not affected by the directionality of the fluff. Combined with the characteristic that the collision of fluff can be detected, even if the fluff collides with the contact sensing member 11 at a high speed of 2000 m / min or more, the linear shape like a contact detection needle as in the prior art. Since the material is not formed into a shape, it is possible to detect the contact of the fluff with sufficient accuracy without fear of damage.

It should be noted that another reason why the fluff detecting device of the present invention is installed on the downstream side of the entanglement imparting device 32 in the direct spinning drawing process already described with reference to FIG. 1 is as described above. It is possible to enjoy the advantage that even the fluff generated in the device 32 can be detected.

As another reason, small fluff Ya
In the case where particularly large fluff is generated, the fluff becomes the fluff Yb as shown in FIG. 2B by the action of the compressed air blown out from the entanglement imparting device 32, unlike the case of No. Another point is that the sensing member 11 is more likely to collide with, and its impact force is increased, so that the fluff can be detected more reliably and satisfactorily.

Furthermore, it is preferable to install the fluff detecting device of the present invention on the downstream side of the entanglement imparting device 32 as described above.
In order to regulate the yarn path at the entrance and the exit of the yarn Y to the yarn 2, a yarn path regulation guide (in particular, a guide for regulating the yarn path on the exit side is important) is originally attached. Therefore, regarding the existing yarn path regulation guide provided in the entanglement imparting device 32 and the guide bracket for supporting this, the yarn path regulation guide 10 of the present invention is used as it is, instead of the existing yarn path regulation guide. The point is that it can be used.

By the way, the fluff contact detector 13 of the present invention
Can use a dynamic strain gauge or the like to detect the collision force of the fluff, but it is preferable to use a vibration detector that detects the vibration propagating through the contact force transmitting member 12, and the specific vibration As an example of the detection sensor, a commercially available vibration sensor manufactured by Keyence Corporation (sensor head model: GH-513, amplifier unit: GA-223) and the like can be preferably used.

In this case, the contact sensing member 11 is provided between the yarn guide regulation guide 10 and the contact sensing member 11 as described above.
It is preferable to fix the support member 14 to the support member 14 with a fixing tool 17 such as a hexagon socket head cap bolt so that a certain gap is formed via a vibration-proof rubber so as to vibrate due to fluff collision. When the fluff comes into contact with the contact sensing member 11 due to the gap thus formed, the contact sensing member 11 is pushed in the traveling direction of the yarn Y, and the amount of change (vibration) is detected by the vibration detector. It is preferable that the system be transmitted to 13.

Next, the relationship between the yarn guide regulation guide 10 and the contact sensing member 11 will be described in detail with reference to FIG. In addition, FIG. 3 shows the yarn guide regulation guide 10 shown in FIG.
FIG. 3A is a partially enlarged view in which a portion related to the contact sensing member 11 is enlarged, and FIG.
(B) shows the figure seen from the upper surface, respectively.

Here, in FIG. 3, although the shape of the dotted circle of the contact sensing member 11 depends on the shape of the yarn guide regulation guide 10, it goes toward the threading slit yarn guide regulation hole for convenience of threading. The U-shape formed is preferred. Further, it is necessary to change the size of the yarn path regulation hole of the yarn path regulation guide 10 according to the fineness of the yarn to be threaded, the number of filaments, and the size of the fluff to be detected. It is preferable that the radius of the U-shaped hole indicated by the dotted circle 11 (denoted by reference numeral O) is larger than the radius of the yarn path regulation hole of the yarn path regulation guide 10. By doing so, it is possible to prevent the filament Y from breaking due to abrasion when the yarn Y comes into contact with the contact sensing member 11 and causing a new fluff here.

The fluff detection signal processing uses a comparator function that a commercially available sensor amplifier has as a function, and when a vibration exceeding a specified vibration value occurs, a pulse signal is output as an output. I tried to output it. Then, the pulse signal was received by the counter and the number of fluffs generated was displayed. Depending on the case, this pulse signal is received by a personal computer, and the tabulation software etc. is used.
It is also possible to manage the number of fluffs generated for each weight or each duff. Further, by changing the specified vibration value, it is possible to improve the detection accuracy and efficiency by particularly focusing on large fluffs for detection, and it is also possible to detect as small fluff as possible.

The fluff detecting device according to the present invention described above is shown in FIG.
Although the direct spinning and drawing process as described above is used as an example, it is apparent from the spirit of the invention that it can be widely applied to a simple spinning process of multi-filament multi-filaments.

[0054]

As described above, according to the present invention, the fluff detecting device provided at the upper portion of the yarn path regulation guide detects the fluff generated in the running yarn. Is. Specifically, it is provided on the upper part of the yarn path regulation guide so as to surround the yarn Y in the circumferential direction, supports both of the means, and transmits the vibration of the fluff that comes into contact with the means to the vibration detection means. It is possible to detect fluff and loops generated in a multi-thread running yarn.

Therefore, unlike the prior art, it is not necessary to separate the fluff from the yarn by using centrifugal force, and there are few restrictions on the mounting position. Furthermore, the possibility that the fluff detecting means is damaged due to the occurrence of yarn breakage or the like can be significantly reduced, and a great effect can be exerted for stably detecting fluff.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view illustrating the configuration of a direct spinning and drawing process for applying the fluff detection device of the present invention.

FIG. 2 is a schematic explanatory view specifically illustrating the configuration of the fluff detection device of the present invention.

FIG. 3 is a schematic explanatory view specifically illustrating the configuration of the fluff detection device of the present invention.

[Explanation of symbols]

1 fluff detection device body 10 Thread guide regulation guide 11 Touch sensing member 12 Contact force transmission member 13 fluff contact detector 14 Support members 15 Main body fixing member 16 Protective material 17 Fixture

Claims (9)

[Claims] 1. A method for detecting fluff generated in a multifilament yarn traveling at a high speed of 2000 m / min or more, wherein the yarn path of the yarn is regulated to a straight track so as not to change the traveling direction of the yarn. However, the contact sensing member for contacting the fluff generated on the running yarn on the regulated yarn path is not in contact with the yarn main body, but is in a state of being in contact with the fluff generated on the yarn. A method for detecting fluff of a running yarn, which is formed and provided to detect that fluff comes into contact with the contact sensing member. 2. The running yarn fluff detection method according to claim 1, wherein the contact sensing member has a plate-like shape. 3. The method for detecting fluff of a running yarn according to claim 1, wherein the filaments forming the multifilament yarn are entangled with each other and the entangled yarn is guided to the contact sensing member. 4. The running yarn fluff detection method according to claim 1, which is used in a step of directly spinning and drawing a fiber for industrial materials. 5. A yarn path regulation guide that regulates a yarn path of a traveling yarn to a constant straight track, and a gap that maintains contact with the fluff generated on the yarn but not with the yarn main body. A fluff detecting device for a traveling yarn, comprising a contact sensing member provided in the upstream of the yarn path regulation guide, and a fluff contact detector connected to the contact sensing member. 6. The running yarn fluff detection device according to claim 5, further comprising a support member that supports the contact sensing member. 7. The running yarn fluff detecting device according to claim 5, wherein the contact sensing member is a plate-like member provided with an opening that comes into contact with the fluff but not the yarn body. . 8. The running yarn fluff detection device according to claim 5, wherein a member connecting the contact sensing member and the fluff contact detector is a linear member. 9. The running yarn according to claim 5, wherein the fluff contact detector includes a vibration detection sensor that detects vibration generated when fluff comes into contact with the contact sensing member. Fluff detector.