JP5048988B2 - Yarn splicing device and yarn splicing method - Google Patents

Description

  The present invention relates to a yarn splicing device and a splicing method for entanglement of yarns such as carbon fibers, and in particular, an end portion of one small tow of a carbon fiber precursor that is a collective tow that can be divided into a plurality of small tows in the width direction. The present invention relates to a yarn joining device and a yarn joining method for joining a yarn and a starting end portion of the other small tow.

Conventionally, in order to improve the operability in the production process (flame resistance process) of carbon fiber, the ends of the acrylic fiber, which is the precursor of the carbon fiber, are entangled and joined together. There is known a yarn splicing device for supplying yarn fibers to a carbon fiber production process.
As this yarn splicing device, for example, as disclosed in Patent Document 1, a pair of clamp means for holding a thread composed of a presser base and a presser bar, and a plurality of clamp means provided between the clamp means. In order to relax the yarn, there has been proposed one in which the interval between the clamping means is reduced.

  Further, there are provided three or more entanglement means in the longitudinal direction of the yarn in the entanglement processing chamber, and thread holding means supported on both sides of each entanglement means so as to be swingable in the direction transverse to the longitudinal direction of the yarn. A thread gripping means and a swing operation means for swinging the entanglement means are provided, and the distance between the entanglement means is 70 to 300 mm (for example, see Patent Document 2). The swing operation means for swinging the thread gripping means of the apparatus disclosed in Patent Document 2 grips the yarn with any one thread gripping means first, and then from the one thread gripping means. It has a mechanism for gripping the yarn sequentially by each yarn gripping means in the direction of leaving.

Furthermore, the ends of the two fiber yarns are aligned, and the same end is continuously ejected from the entanglement nozzle with the fluid, and the yarn is reciprocated at least once over the connection region of the two fiber yarns. A method of connecting the strips in a flat shape has been proposed (see, for example, Patent Document 3).
And the apparatus which entangles in a flat shape with the apparatus which has arrange | positioned several entanglement means between the holding | grip apparatus which hold | gripped the piled yarn, and the holding | gripping apparatus is proposed (for example, refer patent document 4).
Japanese Patent Publication No. 4-33711 Japanese Patent No. 3389624 JP 2002-302342 A Japanese Patent Application No. 2003-503871

  However, in the technique disclosed in Patent Document 1, the slack dimension between the clamping means is defined as a predetermined dimension. However, when a plurality of entanglement means are provided, each entanglement is performed only by providing a ballooning prevention plate. Since the slack allowance of the means is not individually regulated, there is a problem that the entanglement becomes uneven and a sufficient splicing effect cannot be obtained. In addition, there is a problem in that a portion having a high yarn density is locally formed and the high-density portion accumulates heat during the flameproofing process and may cause yarn breakage, so that the flameproofing treatment temperature must be lowered. .

  In the technique disclosed in Patent Document 2, entanglement means are provided between the yarn gripping means, and further, slack allowances are individually provided on both sides of the entanglement means by the yarn relaxation means by swinging. Since the gripping means and the yarn relaxing means are individually provided, there is a problem that the apparatus becomes large when a plurality of entanglements are required.

  Furthermore, in the technique disclosed in Patent Document 3, the yarn is relaxed by bringing the nips close to each other, and the entanglement nozzle moves to entangle the ends of the fiber yarns. Many entangled portions are formed at the initial stage of spraying, and then entanglement formation gradually decreases. For this reason, the entangled portions of the fiber yarns become uneven as a whole, and there is a problem that a sufficient splicing effect cannot be obtained. In addition, there is a problem in that a portion having a high yarn density is locally formed and the high-density portion accumulates heat during the flameproofing process and may cause yarn breakage, so that the flameproofing treatment temperature must be lowered. .

  In the technique disclosed in Patent Document 4, a plurality of entanglement means are arranged between the nips for gripping the yarn. However, the yarn is relaxed by bringing the yarn gripping device close to the nip, and the plurality of entanglement means simultaneously. In order to entangle, the individual entanglement becomes uneven, the splicing effect for the number of entanglements cannot be obtained, and there is a problem that the number of entanglements must be increased more than necessary.

Therefore, the present invention has been made in view of the above-described circumstances, and prevents yarn breakage of the fiber yarns during the flameproofing process by uniformly entangling the fiber yarns. A yarn splicing device and a yarn splicing method capable of reducing the drop width are provided.
Further, the present invention provides a yarn splicing device and a splicing method that are small in size and capable of uniformly entanglement of fiber yarns and can obtain a sufficient splicing effect with a small number of entanglements.

In order to solve the above-described problem, the present invention provides a pair of yarn clamping portions that overlap a part of two fiber yarns and clamp the overlapped portion in the front and rear, and between the yarn clamping portions. Provided with an entanglement device for injecting and entangled compressed fluid while holding the overlapped portion of the fiber yarns, and the entanglement device moves along the longitudinal direction of the fiber yarns to move the fiber yarns The fiber yarn is a collective tow that is bundled so as to be split in a width direction into a plurality of small tows, and the entangled device includes each of the divided small tows. A small toe holding part that holds the gap in the width direction is provided, and the entanglement device is configured to be able to entangle the overlapped portions of the divided small tows at the same time, and the yarn clamping part At least one of which is held by the confounding device Go multiple times overlapped portions of fiber yarns that are to impart relaxation amount, the number of movements is characterized in that it is set in accordance with the interlacing number.
In this case, the movement interval of the entanglement device may be set to 30 to 70 mm, and the relaxation amount may be set to 1 to 5 mm.

Further, the present invention is that the Rukoto the is held in a state where the starting end of the other of the small tows of one the small toe and the end portion of the small tows of the small tows into small tows holding section the superimposed Features.
Furthermore, the present invention is characterized in that the end portion of the one small tow and the start end of the other small tow are subjected to a flameproofing treatment in advance.

Then, the present invention holds collective tows bundled in a plurality of small tows so as to be capable of being divided in the width direction, and holds the small tows in a small toe holding portion at intervals in the width direction with the small tows being divided. The end portion of one small tow of the tows and the end portion of the other small tow of the tows are overlapped, and the overlapped portion is sandwiched in the front and rear by the yarn sandwiching portion, and between the yarn sandwiching portions. In the state where the overlapped portions of the fiber yarns are held, an entanglement device is provided to simultaneously entangle the compressed portions with the compressed fluid so that the entanglement device follows the longitudinal direction of the fiber yarns. In which at least three of the fiber yarns are entangled with each other, and at least one of the yarn clamping portions imparts a relaxation amount to the overlapped portion of the fiber yarns held by the entanglement device And the process of moving And repeating sequentially at least three times and a step of entangling the fiber thread by the interlacing device formed was relaxed portion nearer interlacing device as relaxation amount.

According to the present invention, at least one of the pair of yarn pinching portions moves to relax the fiber yarn, and the entanglement device moves along the longitudinal direction of the fiber yarn to move the plurality of fiber yarns. Since the portions can be entangled, the entire apparatus can be reduced in size.
In addition, since the number of movements of the yarn pinching portion, that is, the number of times of forming the relaxed portion in the vicinity of the entanglement device is set according to the number of entanglement, a certain amount of relaxation is applied to the overlapped portion of the fiber yarn for each entanglement. Can be granted. For this reason, the whole entangled part of the fiber yarn can be entangled uniformly. Therefore, it is possible to obtain a sufficient splicing effect with a small number of entanglements, to prevent the fiber yarns from being broken during the flameproofing process, and to reduce the decrease in the flameproofing temperature.

  In particular, in a collective tow that is bundled in a plurality of small tows so as to be split in the width direction, the entanglement device is provided with a small tow holding portion that holds the small tows spaced apart in the width direction. Therefore, one start end and the other end of each divided small tow can be reliably entangled.

Next, embodiments of the present invention will be described with reference to the drawings.
1 to 8 show a yarn splicing device 1 according to the present invention, which are arranged in order according to an operation procedure. In each drawing used in the following description, the scale of each member is appropriately changed to make each member a recognizable size.
As shown in FIG. 1, the yarn splicing device 1 includes a pair of clamping portions 3 and 4. The sandwiching portions 3 and 4 sandwich the overlapped portions of the end portion of one collective tow 2a and the start end portion of the other collective tow 2b in the front and back, and the one sandwiching portion 3 is overlapped. The set tows 2a and 2b are provided so as to be movable in the direction of loosening (direction of arrow B in FIG. 3). The sandwiching portions 3 and 4 are each composed of two sandwiching members 3a, 3b, 4a and 4b, and one sandwiching member 3a and 4a is provided so as to be able to contact and separate in the vertical direction with respect to the other sandwiching member 3b and 4b. It has been. The collective tows 2a and 2b are routed between the sandwiching members 3a and 4a and between the sandwiching members 3b and 4b, and are sandwiched between the sandwiching portions 3 and 4 without any slack.

  The collective tows 2a and 2b are obtained by bundling three small tows 5a and 5b in parallel so as to be divided in the width direction. As the collective tows 2a and 2b, acrylic fiber yarns are usually used. The acrylic fiber yarn is not particularly limited as long as it is an acrylic fiber containing acrylonitrile as a main component, but an acrylonitrile polymer containing 85% by mass or more of acrylonitrile units, more preferably 90% or more is used. Acrylic fiber is preferred. As this acrylonitrile-based polymer, a homopolymer or copolymer of acrylonitrile, or a mixed polymer of these polymers can be used. Furthermore, the acrylonitrile polymer is a copolymer of acrylonitrile and a monomer that can be copolymerized with acrylonitrile. Examples of monomers that can be copolymerized with acrylonitrile include methyl (meth) acrylate and ethyl (meth) acrylate. , (Meth) acrylic acid esters such as propyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, vinyl halides such as vinyl chloride, vinyl bromide, vinylidene chloride, (meth) acrylic acid, Acids such as itaconic acid and crotonic acid, and salts thereof, maleic imide, phenylmaleimide, (meth) acrylamide, styrene, α-methylstyrene, vinyl acetate, sodium styrene sulfonate, sodium allyl sulfonate, β-styrene Sodium sulfonate, methallyl sulfo Examples thereof include polymerizable unsaturated monomers containing a sulfone group such as sodium acid acid, and polymerizable unsaturated monomers containing a pyridine group such as 2-vinylpyridine and 2-methyl-5-vinylpyridine. It is not limited to.

Between the clamping parts 3 and 4, the entanglement device 7 is provided so as to be movable along the longitudinal direction of the collective tows 2a and 2b.
The confounding device 7 is for holding and overlapping the overlapping portions of the collective tows 2a and 2b. In the following description, the overlapped portion of the collective tows 2a and 2b held by the entanglement device 7 and entangled is referred to as an entanglement portion 6.

As shown in FIG. 10, the entanglement device 7 includes a first nozzle 8 and a second nozzle 9 that inject compressed air that is a compressed fluid, and the first nozzle 8 and the second nozzle 9 overlap each other. . The interlaced portions 6a, 6b, 6c of the collective tows 2a, 2b are accommodated in a state of being divided between the first nozzle 8 and the second nozzle 9 (a state for each of the small tows 5a, 5b). It has become.
The first nozzle 8 has a passage 10 into which compressed air is introduced. A compressed air introduction port 12 communicating with the passage 10 is provided on one side surface of the first nozzle 8, and the compressed air introduction port 12 is connected to a compressor (not shown).

On the mating surface 14 of the first nozzle 8 with the second nozzle 9, the small tow holding portions 15, 15, 15 for receiving and holding the small tows 5 a, 5 b correspond to the number of the small tows 5 a, 5 b. Three places are formed at intervals. Each small toe holding part 15 is concave and is formed along the longitudinal direction of the small tows 5a and 5b, and has a side surface 16 and a bottom surface 17, respectively.
Between the bottom surface 17 and the passage 10, a plurality of pores 18 are formed in a line at equal intervals so as to extend along the width direction. Compressed air is jetted from these pores 18 toward the second nozzle 9 side.

Here, the height H of the side surface 16 of the small toe holding part 15 is set to 2.5 mm, the width W between the side surfaces 16 is set to 19 mm, and the diameter of the pore 18 and the pore 20 described later is φ0.5 mm. The interval X between the pores 18 is set to 0.8 mm.
The width W between the side surfaces 16 is preferably 0.002 mm / tex to 0.005 mm / tex. When the width W between the side surfaces 16 is smaller than 0.002 mm / tex, twisting tends to occur when the small tows 5 a and 5 b are sandwiched between the sandwiching portions 3 and 4. For this reason, in the flameproofing process, the collective tows 2a and 2b are twisted to increase their thickness and easily store heat, and the collective tows 2a and 2b are liable to break or burn out, which is not preferable. In addition, when the width W between the side surfaces 16 is larger than 0.005 mm / tex, it is difficult to open the small tows 5a and 5b, unevenness occurs at the connecting portion (entangled portion), and the connection strength is increased. Since it falls, it is not preferable. The toe width WA of the collective tows 2a and 2b is the sum of the width of the small tows 5a and 5b having the width W of the side surface 16 and the wall width between the side surfaces 16 of the small toe holding portion 15.

The second nozzle 9 is superimposed on the first nozzle 8 so as to cover each small toe holding part 15 of the first nozzle 8. Similarly to the first nozzle 8, the second nozzle 9 has a passage 11 into which compressed air is introduced. A compressed air introduction port 13 communicating with the passage 11 is provided on one side surface of the second nozzle 9, and these compressed air introduction ports 13 are connected to a compressor (not shown).
A plurality of pores 20 are formed in portions corresponding to the pores 18 formed in the first nozzle 8 between the mating surface 19 of the second nozzle 9 with the first nozzle 8 and the passage 11. Compressed air is jetted from these pores 20 toward the first nozzle 8 side.

  Accordingly, the end portion of the one collective tow 2a and the start end portion of the other collective tow 2b are arranged in a state where the end portion of one small tow 5a and the start end portion of the other small tow 5b are overlapped with each other. 15 and each nozzle 8, 9 for each small toe holding part 15 in a state in which the periphery is surrounded by a side face 16 and a bottom face 17 of the small toe holding part 15 and a mating face 19 of the second nozzle 9. Are entangled in a flat shape (yielded).

Next, the yarn joining operation of the yarn joining device 1 will be described with reference to FIGS.
First, as shown in FIG. 1, the end portion of one collective tow 2a and the start end portion of the other collective tow 2b are divided (in this embodiment, three divisions), and the widths of the small tows 5a and 5b are respectively increased. Align. Then, the end portion of one small tow 5a and the start end portion of the other small tow 5b are respectively overlapped, and the overlapped portion is sandwiched between the front and the back so as not to be loose. Note that the end portion of the small tow 5a and the start end of the small tow 5b are preliminarily flameproofed.

Next, the small tows 5a and 5b are set in the confounding device 7 installed between the sandwiching portions 3 and 4. As a setting method, small tows 5 a and 5 b are respectively accommodated in small tow holding portions 15 formed in the first nozzle 8 of the entanglement device 7, and then the second nozzle 9 is overlaid and fixed on the first nozzle 8. To do.
Next, as shown in FIG. 3, one clamping part 3 is moved in the direction (arrow B direction) in which the small tows 5 a and 5 b are loosened to form a loosened part in the vicinity of the entanglement device 7. At this time, it is preferable that the movement distance (relaxation amount) L1 of the clamping part 3 is 1-5 mm. When L1 is less than 1 mm, the entanglement is not sufficient and the piecing effect cannot be obtained. On the other hand, when L1 exceeds 5 mm, the thickness of the entangled part becomes thick, and, for example, the entangled part tends to accumulate heat during the flameproofing process, which may cause breakage or burnout.

Next, compressed air is injected from the nozzles 8 and 9 of the entanglement device 7 (see FIG. 10). Then, the entanglement part 6 (1st entanglement part 6a) currently hold | maintained at the entanglement apparatus 7 is entangled, and a relaxation part disappears.
In addition, it is preferable that the air pressure of compressed air is 0.3-0.6 MPa. If the air pressure is lower than 0.3 MPa, confounding may not be sufficient. If the air pressure exceeds 0.6 MPa, filament breakage may occur. Further, the jet time of the compressed air is preferably 5 seconds or more.

  Next, as shown in FIG. 4, the entanglement device 7 is moved along the longitudinal direction of the small tows 5 a and 5 b toward the clamping unit 3 (arrow C direction). Then, the clamping part 3 is moved again by a distance L1 in the direction of loosening the small tows 5a, 5b (see FIG. 5), and a relaxation part is formed in the vicinity of the entanglement device 7. Thereafter, compressed air is again sprayed from the nozzles 8 and 9 of the entanglement device 7, and the entanglement portion 6 (second entanglement portion 6b) held by the entanglement device 7 is entangled. The moving distance L2 (see FIG. 4) of the entanglement device 7 is desirably 30 to 70 mm. If the moving distance L2 is less than 30 mm, the entangled portions 6 overlap each other, and there is a possibility that a sufficient splicing effect cannot be obtained. On the other hand, when the moving distance L2 exceeds 70 mm, the connection length (yarn splicing length) is extended more than necessary, and the connection device (yarn splicing device 1) is connected with a decrease in connection and a decrease in workability. Since it becomes large, it is not preferable.

Similarly, as shown in FIGS. 6 to 8, the entanglement device 7 is moved again by a distance L <b> 2 along the longitudinal direction of the small tows 5 a and 5 b toward the clamping unit 3. And the clamping part 3 moves distance L1 toward the direction which loosens the small tows 5a and 5b, and forms a relaxation part in the vicinity of the confounding device 7. Thereafter, the entanglement unit 6 (third entanglement unit 6c) is entangled by the entanglement device 7.
As shown in FIGS. 9A and 9B, the gathered tows 2a and 2b spliced in this way are entangled at three locations 6 (first 1) each time the entanglement device 7 moves. The entangled portion 6a, the second entangled portion 6b, and the third entangled portion 6c) are in a uniform state.

Next, the embodiment of the present invention and a comparative example will be shown specifically to explain the yarn splicing method. In addition, the Example of this invention is not limited by the matter described below.
(Example)
First, two carbon fiber precursors that are aggregated tows (filament number: 150,000) in which three filament fibers of 1.2 dTex / filament and a number of filaments of 50000 are gathered are prepared. One carbon fiber The end portion of the precursor and the start end of the other carbon fiber precursor are treated as a flame resistant treatment in a furnace in which hot air at 240 ° C. is circulated for 70 minutes under a tension of 6.5 m / tex. The amount was 1.36 g / cm 3.

  Next, in one carbon fiber precursor, the toe width of the small tow at the terminal end is aligned to 17.5 mm, and in the other carbon fiber precursor, the tow width of the small tow at the start end is aligned to 18 mm, Were stacked and pinched by the pinching portions 3 and 4 of the yarn splicing device 1 so that there was no slack. In this embodiment, the small tow width is set to 17.5 mm and 18 mm, respectively, and the case where there is a slight error (0.5 mm error) in the tow width of each small tow to be overlapped is obtained. However, it is natural that each tow width should be the same.

  Next, the small tow was set in the small toe holding part 15 (see FIG. 10) of the entanglement apparatus 7, the clamping part 3 was moved, and the small tow was relaxed. In addition, the moving distance (relaxation amount) L1 of the clamping part 3 was 2 mm. Next, 0.55 MPa of compressed air is injected from the first nozzle 8 and the second nozzle 9 for 5 seconds, and the end portion of one carbon fiber precursor and the start end portion of the other carbon fiber precursor are entangled in a flat shape. I let you. In this example, this was repeated five times in succession to entangle five small tows. In addition, the moving distance L2 for each time of the entanglement device 7 was 60 mm.

  The carbon fiber precursor thus spliced (entangled) is subjected to a flame resistance treatment at a process tension of 24.5 mN / tex for 60 minutes in a flame resistance furnace in which hot air of 227 to 248 ° C. circulates, and 300 to 600 Carbonization treatment was performed at 5 mN / tex and 16 mN / tex for 1.5 minutes in a nitrogen atmosphere having a temperature distribution of 1 ° C. and 1150 to 1250 ° C., and the process passability was confirmed. As a result, there was no yarn cutting or the like even when there was some error in the toe width of the small tows that were superimposed.

(Comparative Example 1)
In contrast to the example, the moving distance (relaxation amount) L1 of the clamping unit 3 was set to 0.5 mm, and the other steps were performed under the same conditions as in the example.
As a result, the yarn was cut in the flameproofing step (entangled portion) where the yarn was joined. When the cut part was observed, it was clear at the entangled part.

(Comparative Example 2)
In contrast to the example, the moving distance L2 for each time of the entanglement device 7 was set to 20 mm, and the other processes were performed under the same conditions as in the example.
As a result, there was a portion where the entangled portion was loosened at the portion where the yarn was joined in the flameproofing step, but the flameproofing step could pass. However, the yarn was cut during the carbonization process. When the cut part was observed, it was clear at the entangled part.

Therefore, according to the above-described embodiment, even if the number of filaments of the small tows 5a and 5b of the collective tows 2a and 2b is 48000 or more, the small tow holding portion 15 of the entanglement device 7 reduces the number of filaments. A flat and flat entangled portion can be formed for each of the tows 5a and 5b. For this reason, for example, a small tow is twisted between a yarn feeding process for feeding a carbon fiber precursor to a flameproofing furnace and a flameproofing process for flameproofing the carbon fiber precursor in a flameproofing furnace. Can be prevented.
Further, since the small tow holding portion 15 can reliably entangle each small tow 5a and 5b, the yarn splicing operation of the yarns that can be divided into a plurality of pieces (for example, the collect tows 2a and 2b of the present embodiment) can be performed quickly. It is possible to eliminate the unevenness of the lengths of the yarns after the connection with the separable yarns (after the entanglement).

Furthermore, when the clamping part 3 moves, a relaxation part can be formed in the vicinity of the confounding device 7, and a certain amount of relaxation (1 to 5 mm per confounding part) can be given. And since the entanglement apparatus 7 entangles the entanglement part 6 (6a, 6b, 6c) for every formation of the relaxation part, the uniform entanglement part 6 (6a, 6b, 6c) can be formed. Therefore, heat storage of the entangled portion 6 during the flameproofing process can be prevented, and yarn breakage can be prevented.
Further, the end portion of one small tow 5a and the start end portion of the other small tow 5b are flameproofed in advance, and then entangled by the yarn splicing device 1 to ensure that the flameproofing process does not cause breakage or yarn breakage. The flameproofing process can be passed. Therefore, it is not necessary to lower the flameproofing treatment temperature.
Furthermore, since the entanglement device 7 can reliably and uniformly form the entanglement portions 6 (6a, 6b, 6c), a sufficient piecing effect can be obtained with a small number of entanglements, and one entanglement device 7 can be obtained. Since a plurality of entangled portions 6 (6a, 6b, 6c) can be formed only by this, the thread joining device 1 can be made compact and portable.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
In the above-described embodiment, for example, the case where the collective tows 2a and 2b are entangled at three places, and the case where the collective tows 2a and 2b are entangled at five places are described in the above-described embodiment. The number of entangled portions to 2a and 2b is not limited to these, and may be three or more.

In the above-described embodiment, for example, the case where the collective tows 2a and 2b are obtained by bundling three small tows 5a and 5b has been described, but the number of small tows is not limited to three.
In the embodiment described above, for example, the height H of the side surface 16 of the small toe holding part 15 provided in the first nozzles 8, 8, 8 of the entanglement device 7 is 2.5 mm, and the width W between the side surfaces 16. Is set to 19 mm, the diameter of the pore 18 and the pore 20 described later is φ0.5 mm, and the interval X between the pores 18 is set to 0.8 mm. However, the present invention is not limited to these shapes. Any shape that can hold the small tows at intervals and entangle the small tows can be used.

FIG. 5 is a plan view showing the yarn splicing device according to the embodiment of the present invention and showing a state in which the terminal end of one collective tow and the rear end of the other collective tow are overlapped and sandwiched. It is a top view which shows the yarn splicing apparatus in embodiment of this invention, and shows the state which set the confounding apparatus to the gathering tow clamped by the clamping part. It is a top view which shows the yarn splicing apparatus in embodiment of this invention, and shows the state which formed the loose part in the confounding apparatus vicinity. It is a top view which shows the yarn splicing apparatus in embodiment of this invention, and shows the state which moved the entanglement apparatus. It is a top view which shows the yarn splicing apparatus in embodiment of this invention, and shows the state which formed the loose part in the confounding apparatus vicinity. It is a top view which shows the yarn splicing apparatus in embodiment of this invention, and shows the state which moved the entanglement apparatus. It is a top view which shows the yarn splicing apparatus in embodiment of this invention, and shows the state which formed the loose part in the confounding apparatus vicinity. It is a top view which shows the yarn splicing apparatus in embodiment of this invention, and shows the state which made the gathering tow entangled three places. The gathering tow | toe in embodiment of this invention is shown, (a) is a side view, (b) is a top view. It is a longitudinal cross-sectional view of the entanglement apparatus in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Yarn splicing device 2a ... One set tow (fiber yarn)
2b ... The other set tow (fiber yarn)
3, 4 ... clamping part (yarn clamping part)
5a ... one small tow 5b ... the other small tow 6 ... entangled part 6a ... first entangled part 6b ... second entangled part 6c ... third entangled part 7 ... entangled device 15 ... small toe holding part L1 ... movement of the clamping part Distance (relaxation)
L2: Distance traveled by the confounding device

Claims (5)

A part of two fiber yarns are overlapped, and a pair of yarn clamping portions are provided to sandwich the overlapped portion in the front and back, and the overlapped portion of the fiber yarns is held between the yarn clamping portions. A splicing device for injecting a compressed fluid in a state to entangle it and moving the entanglement device along the longitudinal direction of the fiber yarn to entangle the fiber yarn in at least three places;
The fiber yarn is a collective tow that is bundled in a plurality of small tows so as to be split in the width direction, and the entanglement device has small tow holding portions that hold the divided small tows at intervals in the width direction. Is provided,
The entanglement device is configured to be entangled simultaneously with each of the divided portions of the small tows,
At least one of the yarn clamping portions moves a plurality of times so as to give a relaxation amount to the overlapped portion of the fiber yarns held by the entanglement device, and the number of movements is set according to the number of entanglements Yarn splicer characterized by.   2. The yarn splicing device according to claim 1, wherein a moving interval of the entanglement device is set to 30 to 70 mm, and the amount of relaxation is set to 1 to 5 mm. Claim 2, characterized in that it is held in a state where the the starting end of the other of the small tows of one the small toe and the end portion of the small tows of the small tows into small tows holding section the superimposed The yarn splicing device described in 1. 4. The yarn splicing device according to claim 3 , wherein the end portion of the one small tow and the start end of the other small tow are subjected to a flame resistance treatment in advance. Collected tows that are bundled in a plurality of small tows so as to be capable of being divided in the width direction are held in the small tow holding portion at intervals in the width direction in a state where each small tow is divided, and one of the small tows is small. The end portion of the tow and the end portion of the other small tow of the small tows are overlapped, and the overlapped portion is sandwiched in the front and back by the yarn sandwiching portion, and the fiber yarn is sandwiched between the yarn sandwiching portions. An entanglement device that simultaneously injects and entangles a compressed fluid to each overlapped portion while holding the overlapped portion is provided, and the entanglement device moves along the longitudinal direction of the fiber yarn to move the fiber A yarn splicing method for entanglement of at least three yarns,
A step of moving at least one of the yarn clamping portions so as to impart a relaxation amount to the overlapped portion of the fiber yarns held by the entanglement device, and a relaxation amount formed in the vicinity of the entanglement device thereby And the step of entanglement of the fiber yarns by the entanglement device is sequentially repeated at least three times.

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