JP2012193484A - Method for producing heat-generating machine sewing thread - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a staple fiber blended thread in which metal fibers and synthetic fibers are uniformly distributed on the order of single fibers, and thereby to provide a heat-generating machine sewing thread significantly improved in machine sewing performance as compared to a conventional one.SOLUTION: A method for producing a heat-generating machine sewing thread, in which metal staple fibers and synthetic staple fibers are blended, includes feeding a metal fiber filament bundle and a synthetic fiber filament bundle arranged in parallel with each other to a stretch-breaking apparatus. In the method, the filament bundles are each opened to form flat threads. The flat threads are superposed in the thickness direction of the flat threads and are passed through two pairs of nip rollers having different peripheral speeds in the order of a pair of low-speed nip rollers and a pair of high-speed nip rollers, during which the flat threads are held between the nip rollers of each pair in the thickness direction so as to keep the flatness. The flat threads are stretch-broken between the two pairs of nip rollers and then passed through an air injection nozzle to be conjugated.

Description

  The present invention relates to a method for producing an exothermic sewing thread excellent in sewing performance by a sewing machine. More specifically, the present invention provides a heat-generating sewing thread that greatly improves the conventional sewability by forming a blended short fiber yarn in which metal fibers and synthetic fibers are uniformly dispersed in the order of single fibers. Regarding the method.

  Conventionally, the exothermic sewing thread (exothermic yarn) is a glove shown in Patent Document 1 (Japanese Patent Laid-Open No. 4-352802) or a planar shape shown in Patent Document 2 (WO99 / 026456 pamphlet). It is known to be used for heating elements. The exothermic yarn used in these patent documents consists of a blended yarn of conductive fibers and non-conductive fibers, and mentions the adjustment of the electric resistance value as the reason for blending the non-conductive fibers. The performance was not sufficient and improvements were required. In addition, in the explanation of the production method, there is no technical description for improving the sewing property by the sewing machine, and no knowledge that the sewing property is improved by blending synthetic fibers is not shown.

When a heat-generating yarn was actually manufactured according to the manufacturing method described in these patent documents and sewn normally with a sewing machine, thread breaks, stitch skipping, puckering, sewing needle damage, etc. frequently occurred. It has been found that there are still various problems in sewing sewing machines.
On the other hand, when a thread was prototyped using only metal fibers and sewed in the same manner, it was found that sewing needles were frequently damaged and thread breakage occurred, so that it was not possible to sew very normally.

  From these facts, the present inventor has found that when synthetic fibers are mixed with metal fibers, the sewing properties are considerably improved. In other words, metal fibers are easier to plastically deform and have a higher coefficient of friction than synthetic fibers, so it is extremely difficult to pass through the hole in the sewing needle at a high speed while receiving sharp bends and friction. It was found that when synthetic fibers excellent in property and deformation recovery are mixed, this problem is greatly reduced and sewing becomes possible. Therefore, when we looked at the exothermic yarn that was prototyped according to the manufacturing method described in these patent documents, there were frequently seen places where the metal fibers gathered together, and in such places, 100% of the metal fibers Since it was easily predicted that the situation would be the same as in the case, various manufacturing methods were examined as to how the agglomeration of the metal fibers can be prevented and the dispersibility can be improved.

  For example, according to the manufacturing method described in Patent Document 2, “the conductive metal wire and the nonconductive fiber are aligned and supplied to the check device, and the metal wire and the nonconductive fiber are both 100 to 800 mm in length. The method of making discontinuous fibers is preferably adopted ", or after being aligned," spanning several times to several tens of times, performing checkout processing, then entangled with a pressurized air nozzle to form a fiber bundle Is possible ”(page 10 of the patent document, etc.). By the way, when the manufacturing method of Patent Document 2 is applied to the manufacturing apparatus of FIG. 1 (1) described later used in the present invention, in FIG. 1, A is a conductive metal wire, B is a non-conductive fiber, and R1 is a supply A roller, R2 is a check roller, N2 is a pressurized air nozzle, and Y is an exothermic yarn. The conductive metal wire A and the non-conductive fiber B are simply aligned, and the apparatus shown in (1) of FIG. 1 (however, the opening guides G1 and G2 and the width adjusting guide G3 are not installed) is used. 4, cross-sectional schematic views of the sewing thread obtained by checking and tying are shown in (1) to (3) of FIG. 4 (1) to 4 (3) is a cross-sectional form when the conductive metal wire A and the non-conductive fiber B are aligned, and each lower row is being checked between the supply roller R1 and the check roller R2. The cross-sectional form of both fibers is shown. In each figure, black circles indicate single fibers of conductive metal wires, and white circles indicate single fibers of non-conductive fibers. As is clear from (1) to (3) in FIG. 4, both the conductive metal wire A and the non-conductive fiber B are arranged by simply aligning them, for example, the dispersion form of both fibers being checked changes depending on the alignment method. It can be easily understood that it is difficult to uniformly disperse the fibers in the order of single fibers, and it is also difficult to prevent the metal fibers from being agglomerated.

Thus, in the above-mentioned patent document, in the description of the manufacturing method, the knowledge to increase the sewing property by the sewing machine, the knowledge that the sewing property is increased by blending the synthetic fiber, the so-called metal fiber and so on No knowledge has been shown to increase the dispersibility at the time of blending synthetic fibers to the order of single fibers to improve the sewing properties.
In order to improve the sewing properties of conventional exothermic sewing threads with sewing machines, it is important to first prevent the agglomeration of metal fibers, and to improve the dispersibility evenly up to the order of single fibers. Finding a method is a challenge.

JP-A-4-352802 WO 99/026456 pamphlet

  The present invention provides a mixed spun fiber yarn in which metal fibers and synthetic fibers are uniformly dispersed in the order of a single fiber, and provides an exothermic sewing thread in which the sewing performance by the sewing machine is greatly improved as compared with the prior art. It is in.

  The present invention is a method for producing an exothermic sewing thread in which a long fiber bundle of metal fibers and a long fiber bundle of synthetic fibers are aligned and supplied to a check device, and the metal fibers and short fibers of the synthetic fibers are mixed. Each long fiber bundle is flattened into flat yarns, and they are overlapped in the thickness direction of the flat, and these are combined into two nip rollers with different peripheral speeds, a low-speed nip roller and a high-speed nip roller. In this case, the flat yarn is sandwiched and held in the thickness direction so that the flat state is maintained in any nip roller, and the flat yarn is sandwiched between the two sets of nip rollers. A method for producing an exothermic sewing thread is characterized in that the strip is checked and then entrapped through an air injection nozzle.

  According to the method for producing an exothermic sewing thread according to the present invention, a mixed spun fiber yarn in which metal fibers and synthetic fibers are uniformly dispersed in the order of a single fiber is obtained, and the sewing performance by the sewing machine is greatly improved as compared with the conventional method. An exothermic sewing thread is obtained.

(1) is a schematic diagram showing an example of an apparatus for carrying out the present invention, (2) is a stack of flat yarns in which long fiber bundles A and B are opened after passing through a guide G3 in (1). FIG. 5 is a perspective view of a portion that is supplied to the nip roller R1 together. It is the schematic diagram which showed an example of the side surface of the exothermic sewing thread | yarn obtained by this invention. (1) is a schematic diagram showing an example of a cross section of an exothermic sewing thread obtained by Example 1 of the present invention, and (2) is a cross section of an exothermic sewing thread obtained by Comparative Example 1 of the present invention. It is a schematic diagram which shows an example. In (1) to (3), the long-fiber bundle of metal fibers and the long-fiber bundle of synthetic fibers are simply drawn together, and the apparatus of (1) in FIG. 1 (however, the opening guides G1, G2, width adjustment) It is a schematic diagram which shows an example of the cross section of the conventional exothermic sewing thread | yarn obtained when processing by guide G3 is not installed).

The present invention is a method for producing an exothermic sewing thread having a plurality of long fiber bundles of metal fibers and long fiber bundles of synthetic fibers and excellent in both fiber mixing properties.
As the metal fiber, a known stainless fiber, copper fiber, nichrome fiber, or the like can be used, and a stainless fiber excellent in corrosion resistance and strength is particularly preferable.
The wire diameter of the metal fiber is preferably 8 to 15 μmφ. The thinner one improves the bending resistance, the flexibility or the uniformity of the checkout process. However, if it is less than 8 μmφ, it is difficult and expensive to produce metal fibers, whereas if it exceeds 15 μmφ, it is difficult to make the exothermic sewing thread thin. It is not preferable to make a tingling when touched. Further, the number of metal fibers in the long fiber bundle is preferably about 20 to 150.
The ratio of the metal fiber to the exothermic sewing thread is preferably 30 to 70% by weight because it is easy to balance electrical characteristics and sewing properties. If it is less than 30% by weight, the electrical resistance is high, whereas if it exceeds 70% by weight, the sewing properties are undesirably lowered.

On the other hand, as a material constituting the long and long fiber bundle of synthetic fibers, polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate and polytriethylene terephthalate, aliphatic polyamides such as nylon 6 and nylon 66, and aromatic polyamides Examples thereof include polyolefins such as polyethylene and polypropylene. Polyester is preferable.
The total fineness of the fiber bundle of the synthetic fiber is preferably 100 to 10,000 dtex, more preferably 500 to 5,000 dtex, and the single fiber fineness is preferably 0.1 to 20 dtex, more preferably. Is 0.5 to 10 dtex.
In addition, the number of filaments of the long fiber bundle of the synthetic fiber is about 20 to 20,000.

In addition, in order to facilitate checkability, both long fibers bundles of metal fibers and synthetic fibers are less crimped, twisted or entangled in fiber bundles, and fiber oil agents have less convergence, friction and static electricity. Is preferred.
In other words, if there is crimp, the fiber tends to stretch and contract easily, and the nip of the fiber end by the check roller becomes uncertain, and if there is a place where twisting, entanglement or convergence or friction due to oil is strong, stress concentrates there, and static electricity When this occurs, the fiber during check is disturbed, and in any case, it becomes a cause of check spots, which is not preferable.

  In addition, when supplying a long fiber bundle to a check device described later, for example, if the long fiber bundle is wound around a bobbin or the like, the bobbin is rotated while rotating the bobbin so that twisting does not occur during unwinding. Even after unwinding and feeding, the long fiber bundle may be rubbed against the side surface of the bobbin at the time of unwinding, and the S / Z may be twisted alternately. Thus, it is necessary to devise such as canceling the S / Z twist by taking an extension space of one traverse or more when winding the bobbin.

  In the present invention, a long fiber bundle of metal fibers and a long fiber bundle of synthetic fibers are each opened into a flat shape (tape shape) to form flat yarns, which are overlapped in the thickness direction of the flat shape, Two sets of nip rollers with different speeds are passed through a low-speed nip roller and a high-speed nip roller in this order, and the flat yarn is thickened so that the flat state is maintained in any nip roller. It is a method for producing an exothermic sewing thread characterized in that the flat yarn is clamped between the two sets of nip rollers, and then the flat yarn is checked between the two sets of nip rollers, and then knitted through an air jet nozzle. By this method, an exothermic sewing thread composed of a mixed fiber in which metal fibers and synthetic fibers are uniformly mixed at the level of a single fiber and the sewing performance by the sewing machine is greatly improved as compared with the prior art can be obtained for the first time.

That is, a plurality of long fiber bundles composed of metal fiber long fiber bundles and synthetic fiber long fiber bundles that are flattened and arranged in parallel are overlapped in the flat (tape-shaped) thickness direction. In order to maintain a flat state, a fiber bundle in which individual fibers are mixed apart without being formed into a large lump by gripping with a pair of low-speed nip rollers in the thickness direction of the flat. Is obtained.
In addition, even with a high-speed nip roller, the flat yarn made of two (or more) different types of long fibers fed from the low-speed nip roller is gripped in the flat thickness direction so that the flat state is maintained. At the same time, the flat yarn is checked between the nip rollers. At this time, corresponding to the peripheral speed ratio of the high-speed nip roller and the low-speed nip roller, the fibril lump of each fiber remaining in the flat yarn is reduced.
Furthermore, the flat yarn fed from the low-speed nip roller is held and checked one by one in the order of arrival at the high-speed nip roller, so that each fiber is mixed at the single fiber level. Is obtained.
In the present invention, after the above process, the fiber bundle sent from the high-speed nip roller is entrapped through the air injection nozzle, and even in this case, each fiber is disturbed by the air injection nozzle, and more A fine mixed state can be obtained.

As described above, in the present invention, the long fiber bundle of metal fibers and the long fiber bundle of synthetic fibers are individually passed through a fiber opening device so that the fiber bundle is thinly taped in the width direction and has the same width. After being opened, both are laminated in the thickness direction and supplied to the check area, and the check and draft are uniformly applied as it is.
In other words, when the fibers are spread and laminated as described above and then gripped by the high-pressure nip roller in the checkout area, a mixed fiber state in which each fiber is mixed in an alternating manner in the order close to a single fiber is obtained without becoming a large lump. It is done.

In addition, the mixed fiber bundle obtained in this way is gripped by another pair of high-pressure nip rollers whose peripheral speed is about 10 to 40 times faster than that of the high-pressure nip roller, and is further shredded, and further about 10 to 40 times. Therefore, each small fiber lump remaining in the mixed fiber bundle is further reduced to 10 to 40 times.
In addition, since the mixed fiber bundle is fiber-gripped one by one in the order of arrival at the high-pressure nip roller on the high-speed side, it is further finely dispersed, and a mixed fiber state of single fiber order is obtained.
Furthermore, the thin fiber bundles sent out from the high-pressure side high-pressure nip roller are conjugated by the high-pressure air jet nozzle, so that each fiber is disturbed and finer. A dispersed fiber state is obtained.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 (1) is a schematic view showing an example of an apparatus for carrying out the present invention, and FIG. 1 (2) is a long bundle of metal fibers A and synthetic fibers after passing through a guide G3 in FIG. It is the schematic which shows the perspective view of the part which piles up each flat yarn which opened the long fiber bundle B, and supplies it to nip roller R1.
That is, in FIG. 1, the long fiber bundle A of the metal fibers and the long fiber bundle B of the synthetic fibers are passed through the opening guides G1 and G2, respectively, and opened flatly and thinly, and then they are stacked in the thickness direction. After the alignment, the opened flat yarn is passed through the low-speed nip roller R1 and the high-speed nip roller R2 having a higher peripheral speed. At this time, the flat yarn is maintained so that both nip rollers maintain a flat state. Is held between the nip rollers, and the flat yarn made of the long fiber bundles A and B is checked between the nip rollers, and then checked using the air ejection nozzle N1 between the nip rollers R2 and the nip rollers R3. The cut fiber bundle is sucked, and the fiber bundle is conjugated using an air ejection nozzle N2, wound around a winder W, and the exothermic sewing thread Y of the present invention which is a mixed fiber is manufactured. Door can be. Note that an oiling device (not shown) may be provided after the nip roller R3 to apply the fiber oil.

In order to facilitate checking between the nip roller R1 and the nip roller R2, it is preferable that the yarn supplied to the nip roller R1 is not twisted or entangled as described above. In addition, a fiber oil agent may be applied to the yarn, but an oil agent that has little convergence and friction and hardly generates static electricity is preferable. That is, twisting, entanglement, static electricity, fiber oil agent convergence, friction, and the like are not preferable because check spots are likely to occur.
Further, as the opening guides G1 and G2, a plurality of known cylindrical or spindle-shaped rod-shaped guides in which the central portion is expanded are arranged in parallel, or a plurality of guides obtained by bending the rod-shaped guide into an arc shape are arranged. Can be used. As the opening guide, ceramic, metal or the like can be arbitrarily adopted.
In addition, if the guide G3 which restricts and reduces the width | variety of the opened flat yarn in the part just before the nip roller R1 behind the said opening guide is provided, the fiber density of a flat yarn end part will increase. The fiber wrapping around the nip roller R1 can be prevented, which is preferable.
Further, since the yarn guides such as the fiber opening guides G1, G2, and G3 may be twisted when applied obliquely in the length direction of the long fiber bundle, it is necessary to pay attention so that the yarn guides hit perpendicularly.

  In addition, when a long fiber bundle of metal fibers and synthetic fibers is thinly spread in the width direction in a tape shape and laminated in the thickness direction, the nip rollers R1 and R2 used in the checkout region are replaced with a rubber roller and a metal roller. If a pair of high-pressure nip rollers of a rubber roller and a metal roller are laminated so that metal fibers are arranged on the rubber roller side, static electricity generated in the synthetic fiber is Since it leaks into the fiber and the contact between the synthetic fiber and the rubber roller is cut off, the synthetic fiber is preferably prevented from being wound around the rubber roller.

The ratio of the peripheral speed of the nip roller R1 to the peripheral speed of the nip roller R2 is preferably 1: 8 to 1:40, and more preferably 1:10 to 1:30. That is, when the ratio of the peripheral speeds is less than 1: 8, it is necessary to increase the peripheral speed of the nip roller R1, so that the fiber end after the checkout is easily wound around the ratio. The thickness ratio of the check yarn due to spots increases, which is not preferable.
Moreover, it is preferable to provide the guide G4 which interrupts | blocks the accompanying flow of the air which generate | occur | produces on this roller surface in the nip roller R2 flow toward a roller edge part direction at a nip point. In other words, unless this accompanying flow is interrupted, the tip of the fiber sent out from the nip roller R1 tends to be difficult to stably nip with the nip roller R2, and therefore a check spot is likely to occur, Absent.

Further, as the air injection nozzle N1, a nozzle having a suction action is used so that the check fiber carried out from the nip roller R2 does not stick to the roller, but has a turning action simultaneously with the suction action. Use of a nozzle is preferable because fibers can be sucked more effectively.
On the other hand, as the air ejection nozzle N2, depending on the purpose, the fiber end is wound around the checked fiber bundle by a swirl flow and bound and conjugated, or the fibers in the checked fiber bundle are disturbed and entangled. Conjugates can be used.

  By the manufacturing method described above, a mixed fiber consisting of a plurality of long fiber bundles of metal fibers and long fiber bundles of synthetic fibers, each of which consists of fibers that have been checked out from the long fiber bundles, Heat generated from the mixed yarn as shown in FIG. 2 or FIG. 3 (1), which is excellent in the fiber mixing property in which the same type of single fiber does not exist as a bundle of five or more fibers in the cross section of the mixed yarn. Sexual sewing thread can be obtained.

  When a long fiber bundle of metal fibers and a long fiber bundle of synthetic fibers are spread in a thin tape shape in the width direction and laminated in the thickness direction, if the ratio of synthetic fibers is higher, the synthetic fiber If two long fiber bundles are used and the long fiber bundle of metal fibers is sandwiched between them and supplied to the check area, the disturbance of the metal fibers during check can be reduced and the check can be made uniform. The effect which can be obtained is acquired and it is preferable.

The average fiber length after checking the metal fibers in the mixed yarn (exothermic sewing thread) obtained in this manner is preferably 300 mm to 800 mm. If it is less than 300 mm, the contact between the metal fibers decreases, and the electrical resistance becomes high or easily fluctuates, which is not preferable. On the other hand, if it exceeds 800 mm, the distribution of check points is disturbed especially on the metal fiber side, and check spots are likely to occur, which is not preferable.
Moreover, as an average fiber length of the single fiber of the synthetic fiber which comprises an exothermic sewing thread | yarn, 5-150 cm is preferable, 10-30 cm is more preferable, and 10-25 cm is further more preferable. If the average fiber length is less than 5 cm, fluff is likely to occur, and the check yarn tends to be difficult to form. On the other hand, if it exceeds 150 cm, uniform mixing is difficult and exothermic spots are likely to occur.

  In addition, the mixed yarn (exothermic sewing thread) obtained in this way is, for example, subjected to a primary twist of 100 to 800 times / m in the mixed yarn, and further, two of these are combined to 150 to 800 Twist / m in the Z direction, the yarn is put into practical use as an exothermic sewing thread of twin yarn.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to this.
[Example 1]
Using the manufacturing apparatus shown in FIGS. 1 (1) to (2), a stainless steel fiber (manufactured by Yamanaka Sangyo Co., Ltd., Naslon) having a wire diameter of 8 μmφ and a number of fibers of 1,500 as the long fiber bundle A of metal fibers was synthesized. As the long fiber bundle B, polyethylene terephthalate fiber (Tetron, manufactured by Teijin Fibers Ltd.) with a total fineness of 1,000dtex and 1,334 fibers is used. Unwind in the direction and pass through the opening guides G1 and G2 respectively while reducing the twist and entanglement by putting a 2.3m extension space in the middle. At the same time, the spread width was regulated to about 7 mm using the guide G3 and supplied to the high-pressure nip roller R1.
Next, the laminated fiber bundle is uniformly checked and thinly drawn between the high-pressure nip roller R1 and the high-pressure nip roller R2 whose peripheral speed is 20 times faster than this, and subsequently between the high-pressure nip roller R2 and the nip roller R3. Conjugation is imparted to the composite fiber bundle using the suction air nozzle N1 and the conjugating air nozzle N2 utilizing a swirling flow, and the substantially equal untwisted fiber bundle of 330 dtex as shown in FIG. It was wound around a winder W as an exothermic sewing thread Y having a side surface form in which the ends were wound and bound and conjugated, and the ratio of metal fibers was 54 wt%. Moreover, the schematic diagram of the cross section of the obtained sewing thread | yarn is shown to (1) of FIG. Here, in (1) of FIG. 3, black circles indicate single fibers of metal fibers, and white circles indicate single fibers of synthetic fibers (hereinafter the same).

This exothermic sewing thread Y was subjected to a twist of 500 times / m in the S direction, and two of them were subjected to an upper twist of 450 times / m in the Z direction to obtain a double-ply exothermic sewing thread.
Using this two-ply exothermic sewing thread and embroidering a hand-shaped pattern on a textile base fabric made of polyethylene naphthalate fiber, the sewing speed can be reduced to 80% of a general embroidery sewing thread. It was possible to sew without any problems, and a seam quality without any problems was obtained.
Also, a vinyl chloride film is laminated on the front and back surfaces of this embroidery base fabric, inserted and fixed in the back side of the glove with five fingers, and electrodes are installed on both ends of the exothermic sewing thread. When finished as a cold work glove with a resistance of 1.3μΩm, when wearing a cold work glove in a -15 ° C freezer room and using a small and lightweight rechargeable battery with a voltage of 12V, a few seconds It generated heat at about 33 ° C and was able to work comfortably without biting with 5 fingers.

[Comparative Example 1]
In Example 1, the space for extending the long fiber bundle of metal fibers and the long fiber bundle of synthetic fibers, the opening guides G1 and G2, and the width adjusting guide G3 are removed, and they are simply pulled directly from the respective bobbins to the supply nip roller R1. Except that they were supplied only by aligning them, a heat-generating sewing thread was produced in the same manner as in Example 1 and sewing was performed in the same manner as in Example 1. When the sewing speed was reduced to 40%, The stitch skipped and sewing became possible, but sufficient puckering was still observed in terms of the quality of the sewing product, and sufficient quality could not be obtained. A schematic cross-sectional view of the exothermic sewing thread obtained in this way is shown in FIG.

<Consideration of Example 1 and Comparative Example 1>
As shown in FIG. 3, as shown in FIG. 3, the diameter XX ′ of the yarn perpendicular to the center of the cross section of each of the five exothermic sewing machine yarn length methods obtained in Example 1 and Comparative Example 1 was used. The number of single fibers of the metal fiber bundle on YY ′ was counted, and the average value Av and the range (difference between the maximum value and the minimum value) R were calculated. As a result, as shown in FIG. 3 (1), the exothermic sewing thread according to Example 1 had Av = 1.5 and R = 3, whereas the exothermic sewing thread according to Comparative Example 1 As shown in (2), Av = 2.8, R = 6, and the dispersibility of the exothermic sewing thread metal fiber and synthetic fiber by the production method of the present invention is greatly improved compared to the conventional product, and more It was found that the fibers were uniformly dispersed and blended in the order of single fibers.
Further, when the exothermic sewing yarns obtained in Example 1 and Comparative Example 1 were each knitted into a knitted fabric, it was difficult to knit the Comparative Example 1 product unless the speed of the cylinder knitting was set at 40% or more slower than that of the Example 1 product. In addition, the results obtained were similar to the sewing performance of the sewing machine, such as the variation in the size of the stitches, and the unevenness of the thickness of the yarn was conspicuous when viewed through the knitted fabric. It became clear that the characteristic sewing thread was improved not only in dispersibility but also in check and thickness.

According to the method for producing an exothermic sewing thread according to the present invention, it is possible to obtain a blended short fiber yarn in which metal fibers and synthetic fibers are uniformly dispersed on the order of a single fiber, so that the sewing performance by the sewing machine is greatly improved over the conventional product. An exothermic sewing thread is obtained.
At the same time, since the uniformity of the yarn is improved, the uniformity of heat generation and the appearance are also improved, and there is a possibility that the industrial application field can be greatly expanded as compared with the conventional products.

A: long fiber bundle of metal fibers B: long fiber bundle of synthetic fibers G1, G2: fiber opening guide G3: flat yarn width adjusting guide G4: air wake blocking guide R1: low speed nip roller R2: high speed nip roller R3 : Nip roller N1, N2: Air ejection nozzle W: Winder Y: Mixed yarn (exothermic sewing thread)

Claims (3)

  In a method for producing an exothermic sewing thread in which a long fiber bundle of metal fibers and a long fiber bundle of synthetic fibers are gathered and supplied to a check device and mixed with short fibers of metal fibers and synthetic fibers, each long fiber Open the bundle flatly to make flat yarns, and superimpose them in the thickness direction of the flat, and pass this through two pairs of nip rollers with different peripheral speeds, in the order of low-speed nip roller and high-speed nip roller. At that time, the flat yarn is sandwiched and held in the thickness direction so that the flat state is maintained in any nip roller, and the flat yarn is checked between the two sets of nip rollers. And then, the method for producing an exothermic sewing thread is characterized by being conjugated through an air injection nozzle.   When a long fiber bundle of metal fibers and a long fiber bundle of synthetic fibers are each flatly opened and laminated in the thickness direction, a pair of high-pressure nip rollers consisting of a rubber roller and a metal roller used in the check zone 2. The method for producing an exothermic sewing thread according to claim 1, wherein lamination is performed so that metal fibers are disposed on the rubber roller side.   When a long fiber bundle of metal fibers and a long fiber bundle of synthetic fibers are each opened in a flat shape and laminated in the thickness direction, two long fiber bundles of synthetic fibers are used, and a long fiber bundle of metal fibers is interposed between them. The method for producing an exothermic sewing thread according to claim 1 or 2, wherein the yarn is fed to the checkout region in a sandwiched state.