JPH07197344A - High-strength sewing yarn - Google Patents

Abstract

PURPOSE:To obtain high-strength sewing yarns capable of obtaining such high- level sew line strength as to be hard to cause yarn breakage even in sewing operation under high tension. CONSTITUTION:This high-strength sewing yarn can be obtained by covering a high-strength yarn 2>=20g/d in tenacity with plural synthetic fiber yarns 1 through their twisting and by bonding both the high-strength yarn and synthetic fiber yarns with a thermally adhesive filament yarn 7. In this case, the synthetic fiber yarn is interlaced yarn having numerous loops on the surface by a fluid disturbance treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing thread in which a high-strength fiber thread is covered with a synthetic fiber thread and enables sewing under high tension.

[0002]

2. Description of the Related Art Conventionally, most sewing threads have been made of natural fibers such as cotton and silk, but in recent years, synthetic fibers such as nylon and polyester have become mainstream. There is.

When these synthetic fibers are used for a sewing thread, a filament thread is usually twisted. In particular, in order to make the entire sewing thread non-torque, after the lower twisting, the upper twisting and twisting are performed to balance the twisting and the heat is further applied. Some sets suppress torque development, and some also have a coating treatment with resin etc. after twisting.

However, these filament sewing threads have a poor strength surface. For example, when they are sewn with a sewing machine or the like, if they are handled at a high speed and under a high tension, they have a poor strength surface, which leads to thread cutting. ， In order to support sewing that requires high seam strength, the sewing thread must be thick,
Therefore, the sewing work is troublesome and the amount of thread used is increased, which is economically disadvantageous.

On the other hand, the spun sewing thread made of synthetic fiber has many fluffs and loops on the surface of the sewing thread, so that it fits well on the product to be sewn and has the advantage that there is little problem of pulling out, but it has a strong surface. Is less than filament sutures, and has drawbacks such as strength unevenness in the thread length direction.

High-strength fiber yarns are used as fibers for sewing threads that solve the problem of strength, and generally include aramid fibers, highly-oriented polyethylene fibers, and highly-oriented polyvinyl alcohol fibers. The use of these high-strength fiber yarns can solve the above-mentioned problems of the high-strength surface, but since these high-strength fiber yarns have a single rigid molecular structure in the axial direction, Therefore, when the thread is processed by a method such as a twisted thread like a normal thread or a resin coating, fluffing occurs, sufficient strength cannot be maintained, and the low elongation causes damage to the fibers, causing mutual interference. I can't get enough adhesion. On the other hand, in order to obtain mutual adhesion between the fibers by resin coating or the like, a large amount of resin must be impregnated, and as a result, the texture becomes hard and it is difficult to use.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a sewing thread which enables sewing under high tension. The purpose of the present invention is to provide a sewing thread which has a soft texture, fits well to the product to be sewn, and has little pull-out.

[0008]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the present invention provides a high-strength sewing thread characterized in that a high-strength fiber thread having a strength of 20 g / denier or more is covered by twisting of a plurality of synthetic fiber threads, and a high-strength fiber having a strength of 20 g / denier or more. A high-strength sewing thread characterized in that the thread is covered by twisting of a plurality of synthetic fiber threads, and the high-strength fiber thread and the synthetic fiber thread are bonded to each other by a heat-bonding filament thread, and further these sewing threads The high-strength sewing thread is characterized in that the synthetic fiber thread is a entangled thread having many loops on the surface.

The present invention will be described in detail below. The high-strength fiber yarn used in the present invention is a fiber having a strength of 20 g / denier or more, which highly orients the molecular chain of the fiber, reduces the entanglement of the molecular chain, and reduces the number of molecular chain ends to form a fiber. Highly oriented polyethylene fibers, aramid fibers, highly oriented polyvinyl alcohol fibers, etc. If the strength of the high-strength fiber yarn is less than 20 g / denier, the high-strength fiber yarn cannot serve as a substitute yarn for the tenacity value of the synthetic fiber yarn, and the tenacity cannot be endured in sewing under high tension, which causes a problem of thread cutting.

In the present invention, the synthetic fiber yarn for covering the high-strength fiber yarn with a twist is a multifilament yarn made of a thermoplastic polymer such as polyamide, polyester, polyacrylonitrile, polypropylene or polyethylene.

The present invention is intended to coat a high-strength fiber yarn with a twist of a synthetic fiber yarn so that the high-strength fiber yarn exhibits the strong properties and the twist of the synthetic fiber yarn protects the high-strength fiber yarn. It is only necessary to use a high-strength fiber thread having a thickness that can obtain the required strength by selecting the thickness, number of threads, and number of twists of the synthetic fiber thread so long as they can cover the high-strength fiber thread with twist. Good. Further, when the sewing thread of the present invention is obtained by ring twisting, it is advisable to devise the high-strength fiber thread so that it is in the center of the twisting thread.

The thermoadhesive filament used for adhering the high-strength fiber yarn and the synthetic fiber yarn is made of hot-melt resin which can be produced by melt spinning, and examples thereof include polyamide, polyvinyl butyral, and acrylic. Resins, polyesters, polyethylene-vinyl acetate copolymers, ethylene-acrylic acid ester copolymers, polyurethane resins, etc. may be used alone, or they may be used alone or as a rubber component such as butyl rubber or polyisobutylene or a natural resin. It is used as a mixture by adding rosin and the like.

The selection of the above heat-bondable filament yarn is
It may be determined according to the types of synthetic fiber yarn and high-strength fiber yarn. For example, when the synthetic fiber yarn is a polyamide fiber made of nylon 6 or nylon 66 and the high-strength fiber yarn is an aromatic polyamide fiber of aramid fiber, a polyamide copolymer resin or a polyurethane resin is preferable because the fiber affinity is high, When the synthetic fiber yarn is a polyethylene fiber and the high-strength fiber yarn is also a polyethylene fiber, polyethylene-vinyl acetate copolymer or ethylene-acrylic ester copolymer resin is preferable. In any case, the optimum thermo-adhesive filament yarn may be selected in consideration of the melting temperature, adhesiveness, feeling, and cost.

The use ratio of the heat-bondable filament yarn is preferably 1 to 30 wt% with respect to the entire sewing thread,
More preferably, 3 to 20 wt% is excellent in terms of adhesiveness and feeling. If the usage ratio is less than 1 wt%, the amount is insufficient to contribute to the adhesion between the synthetic fiber yarn and the high-strength fiber yarn, and the above-mentioned synthetic fiber yarn and high-strength fiber yarn cannot exert their strength at the same time when sewing with high tension. Therefore, there is a drawback that cannot be endured. On the other hand, if it exceeds 30 wt%, the synthetic fiber yarn and the high-strength fiber yarn can obtain a sufficient adhesive force, but the texture becomes hard, which is not preferable because it is difficult to use and is disadvantageous in cost.

The heat-bondable filament yarn is 80 to 140
Those having a wet heat melting temperature of ° C are preferable. When the wet heat melting temperature is less than 80 ° C., when the sewing thread is dyed, adhesion may already occur in the scouring step, and conversely, elution of these resins may occur during dyeing, resulting in a decrease in the adhesion effect. If the wet heat melting temperature is higher than 140 ° C., the damage of the synthetic fiber threads constituting the sewing thread due to heat during the bonding process becomes large, and it becomes difficult to perform the bonding process simultaneously during the dyeing process.

In the present invention, when a synthetic fiber yarn having a large number of loops formed on the surface thereof in order to improve the fitting property with a product to be sewn, an air processing machine using air as a fluid is used. Is used after being subjected to fluid perturbation under an overfeed condition. Although it is difficult to strictly control the size and number of loops formed by the fluid perturbation treatment, it is generally determined by the overfeed rate of synthetic fiber yarn, fluid pressure, processing speed, etc. The smaller the size, the better as the possibility as a sewing thread and the fit to the product to be sewn.

Next, an example of a method of obtaining the sewing thread of the present invention will be described. FIG. 1 is a schematic explanatory view showing a mechanism of a twisting machine used for producing the high-strength sewing thread of the present invention, in which the high-strength fiber thread is coated with a twist of synthetic fiber thread by using a ring twisting machine. Get the sewing thread. Figure 1 shows three synthetic yarns 1
Shows the case of covering the high strength fiber yarn 2 with the twist of
The three synthetic fiber yarns 1 are guided to the respective slit holes 4a (see FIG. 2) of the twisting guide 4 via the nip roller 3, and are twisted and wound up on the winding bobbin 5 via the traveler. The synthetic fiber yarn 1 supplied at this time may be pre-twisted in advance depending on the characteristics required for the application, and when pre-twisting, the pre-twisting is made opposite to the twisting direction applied here. The high-strength fiber yarn 2 does not pass through the nip roller 3 through a tension imparting device such as a rotary bearing guide, but directly passes through the slit hole 4b (see FIG. 2) of the twisting guide 4 and then the synthetic fiber yarn 1 described above. At the same time, it is wound up on the winding bobbin 5. It is preferable that the tension of the high-strength fiber yarn 2 sent to the twisting guide 4 is 1/5 or more of the tension of the synthetic fiber yarn 1. When the feeding tension is less than 1/5, when the synthetic fiber yarns 1 are twisted together, the high-strength fiber yarns 2 meander and enter, making it difficult to arrange them in the middle between the synthetic fiber yarns 1, 1, 1. Therefore, the maintenance of strength during sewing does not work as a uniform force among the synthetic fiber threads, leading to thread cutting.

Further, the high-strength fiber yarn 2 is replaced with the synthetic fiber yarn 1,
In order to dispose in the middle between 1 and 1, the above feeding force and the slit holes 4a and 4b of the twisting guide 4 shown in FIG.
Placement is important. The slit holes 4b through which the high-strength fiber thread 2 of FIG. 2 passes are the slit holes 4b through which the synthetic fiber thread 1 passes.
It is located at the center of a and each slit hole 4a is equally divided. The sizes of the slit holes 4a and 4b may be adjusted by the thicknesses of the synthetic fiber yarn 1 and the high-strength fiber yarn 2 that pass through. In this way, by adjusting the tension for feeding the high-strength fiber yarn 2 into the twisting guide 4 and using this twisting guide 4, the high-strength fiber yarn 2 is arranged in the middle of the synthetic fiber yarns 1, 1, 1. be able to.

FIG. 3 is an external view of the high-strength thread of the present invention obtained by the above method, and FIG. 4 is a sectional view of the high-strength thread of the present invention. 3 and 4, the high-strength sewing thread 6 of the present invention is obtained by covering the high-strength fiber thread 2 with the synthetic fiber thread 1, and the high-strength fiber thread 2 is located at the center of the high-strength sewing thread 6. I understand.

FIG. 5 is a schematic explanatory view showing a twisting mechanism when a thermo-adhesive filament yarn is used to bond the high-strength fiber yarn and the synthetic fiber yarn in the high-strength sewing thread of the present invention, The thermo-adhesive filament yarn 7 is directly supplied to the slit hole 4b of the twisting guide 4 together with the high-strength fiber yarn 2 using the same equipment as in FIG. It should be noted that the heat-adhesive filament yarn may be wound around the high-strength fiber yarn in advance by an ordinary covering machine or a twisting machine or twisted together, and supplied as the high-strength fiber yarn 2 by the mechanism of FIG. Good.

When the high-strength fiber yarn and the synthetic fiber yarn are bonded by heat fusion of the heat-adhesive filament yarn 7, when dyeing is required, the dyeing is carried out at the same time by an ordinary high-pressure cheese dyeing machine or a hanging type cassette dyeing machine. It is possible. On the other hand, even when dyeing is not required, the above method can be used, and the treatment can be performed by dry heat fusion or steam set. The high-strength sewing thread according to the present invention can maintain its strength by the high-strength fiber thread 2 inserted in the center of the twisted synthetic fiber thread 1, and the synthetic fiber thread 1 and the high-strength fiber thread 2 can be bonded by heat. By adhering the filament yarns 7 by melting, the strength can be further maintained.

FIG. 6 is a cross-sectional view of the high-strength sewing thread of the present invention when the heat-adhesive filament thread is used. In the present invention, when a synthetic fiber yarn having a large number of loops formed on the surface thereof is used to improve the fit with the product to be sewn, the synthetic fiber yarn 1 shown in FIG. A synthetic fiber thread may be used, and the appearance of the high-strength sewing thread 6 of the present invention obtained is shown in FIG. The high-strength sewing thread 6 has a large number of loops 8 on its surface.

In the case of a high-strength sewing thread using a synthetic fiber thread 3 in which a large number of loops 2 are formed on the surface by fluid disturbance treatment, the surface of the twisted thread is formed by loop 2 formation (see FIG. 7). The sewn product has excellent sewability and fit, and the high-strength fiber thread 4 inserted at the center of the twisted thread can be prevented from slipping or moving, and the thermo-adhesive filament thread 5 inserted in the same manner.
This loop of the high-strength fiber yarn 4 and the synthetic fiber yarn 3 acts as a bridge effect during the melt-adhesion, and a strong adhesive force can be obtained.

[0024]

[Working] The high-strength sewing thread of the present invention covers the high-strength fiber thread with the twist of the synthetic fiber thread and arranges it in the middle, so that it is possible to prevent the problem that the high-strength fiber thread is fluffed during processing or sewing. There is an advantage that the tenacity characteristics of the tenacity fiber yarn can be sufficiently exhibited. Further, among the high-strength fiber yarns, which are poor in light resistance, for example, aramid fiber or the like has an advantage of protecting the fibers by covering the surrounding synthetic fiber yarns. Furthermore, the high-strength fiber yarn and the synthetic fiber yarn are melt-bonded with the heat-bondable filament yarn, so that the strong properties of the high-strength fiber yarn can be more stably exhibited.

When a synthetic fiber yarn having a large number of loops formed on the surface is used as the synthetic fiber yarn, since the surface of the sewing thread has loops, the sewn product is excellent in sewability and fit. , In addition, the high-strength fiber yarn inserted in the center can be prevented from slipping or moving, and this loop acts as a bridge effect at the time of melt-adhesion of the heat-adhesive filament yarn that is also inserted, and the high-strength fiber yarn It will firmly bond with the synthetic fiber yarn.

[0026]

EXAMPLES The present invention will be described below with reference to examples. The performances of the samples in the examples were measured and evaluated by the following methods. (1) Mixing ratio (wt%) of the heat-bondable filament yarn It was calculated from the weight of the heat-bondable filament yarn with respect to the total weight of the sewing thread. (2) Sewing thread strength (kg) The sewing thread strength of the prepared sewing thread was measured using a self-recording tensile tester under the conditions of a sample length of 25 cm and a pulling speed of 10 cm / min.

(3) Thread breakage tension (g) Using a single-needle, lockstitch up / down feed sewing machine, width 48.8 mm, thickness
1.15 mm, weaving density is 172 warps / inch, weft 18.5 pieces / inch, two seat belts are stacked, and the sewing machine rotation speed is 3500 needles /
The maximum thread breaking tension when sewn at 12 minutes / 10 stitches was measured and evaluated with a Check Master Tensiometer manufactured by Kanai Koki Co., Ltd.

(4) Seam strength (kg) Using a 1-needle, lockstitch up / down feed sewing machine, two seat belts of the above item 3 are overlapped with a width of 5 cm, and the sewing machine rotation speed is 200
The stitch strength of the seatbelt sewn with 0 stitches / minute and 6 stitches / 5 stitches was measured, and the self-recording tension tester was used under the conditions of a pulling speed of 10 cm / min.

Example 1 Using a normal ring twisting machine, a nylon 6 multifilament 420d / 70f having a strength of 8.6 g / d was moved in the S direction 4 times.
The yarn was twisted at 50 T / M to obtain a lower twist yarn. Next, as shown in FIG. 1, each of the three lower twisted yarns is passed through a nip roller 3, and each slit hole (4 in FIG. 2) of the twisting guide 4 is inserted.
led to a). On the other hand, as a high strength fiber yarn, the strength is 22.4.
Aramid fiber 750d / 5 with g / d and breaking elongation of 2.5%
00f (manufactured by Enka Co., Ltd., trade name: Twaron) is guided directly to the slit hole (4b in FIG. 2) of the twisting guide 4 from the guide in which the rotary bearing guide is attached to the ring twisting machine, without passing through the nip roller 3. 350T / M is twisted in the Z direction together with the above 3 nylon 6 twist yarns,
A thread for sewing thread was obtained. At this time, the tension of sending the high-strength fiber yarn to the twisting guide 7 of the aramid fiber for the nylon 6 lower twist yarn was set to 1/3.

Then, this thread for sewing thread is wound around a cheese for dyeing with a usual soft winder at a winding density of 0.23 g / cm ³ , and a high temperature and high pressure cheese dyeing machine SAK-HK1 type (Sawamura Chemical Machinery Co., Ltd. Manufactured), scoured with the following formulation, and dyed.

[Scouring Formulation] Sanmol FL 1 g / liter (scouring agent, manufactured by Nika Kagaku Kogyo Co., Ltd.) Scouring temperature: 60 ° C. Scouring time: 30 minutes [Staining formulation] Suminol Fast Navy Blue R 1.0% owf ( Acid dye, Sumitomo Chemical Co., Ltd.) Acetic acid (pH adjuster) 1.5 cc / liter Dyeing temperature; 100 ° C Dyeing time; 60 minutes Bath ratio; 1: 5

Next, after washing with hot water, washing with water, dehydration, drying, and re-winding with a normal corn winder, 0.5% of Mary AF-715 oil manufactured by Marubishi Yuka Kogyo Co., Ltd. was used.
Then, the high-strength sewing thread of the present invention was obtained. The performance of the obtained sewing thread was measured, and the results are shown in Table 1.

Example 2 Nylon 6 multifilament 42 having a strength of 8.6 g / d
0d / 70f was twisted in the S direction for 450 T / M to obtain a lower twist yarn. Next, as shown in FIG. 1, the three lower twisted yarns were passed through the nip rollers 3 and led to the slit holes (4a in FIG. 2) of the twisting guide 4. On the other hand, as a high strength fiber yarn, the strength is 22.4 g / d and the breaking elongation is 2.5%.
The aramid fiber 750d / 500f (manufactured by Enka Co., Ltd., trade name: Twaron) is directly twisted from a guide in which a rotary bearing guide is attached to a ring twisting machine, not through the nip roller 3 and a slit hole (see FIG. 2). 4b) and, on the other hand, 100d / of a thermo-adhesive filament yarn made of polyamide copolymer resin having a wet heat melting temperature of 95 ° C.
Two 12f (manufactured by Unitika Ltd., trade name: Flor M), which are also directly twisted without going through the nip roller 3 and led to the slit hole (4b in FIG. 2) of the id 4 by aligning them with the high-strength fiber yarn. , 350 T / M was twisted in the Z direction together with the three nylon 6 lower twist yarns to obtain a yarn for sewing. At this time, the tension sent to the twisting guide 4 for aligning the aramid fiber of the high-strength fiber yarn and the heat-bonding filament yarn with respect to the nylon 6 lower twist yarn was set to 1/3.

Next, this thread for sewing thread is wound around a cheese for dyeing with a usual soft winder at a winding density of 0.23 g / cm ³ , and a high temperature and high pressure cheese dyeing machine SAK-HK1 type (Sawamura Chemical Machinery Co., Ltd. Manufactured) and scoured with the following formulation, and dyeing and fusion treatment were performed at the same time.

[Scouring Formulation] Sanmor FL 1 g / liter (scouring agent, manufactured by Nika Kagaku Kogyo Co., Ltd.) Scouring temperature: 60 ° C. Scouring time: 30 minutes [Staining formulation] Suminol Fast Navy Blue R 1.0% owf ( Acid dye, Sumitomo Chemical Co., Ltd.) Acetic acid (pH adjuster) 1.5 cc / liter Dyeing temperature; 100 ° C Dyeing time; 60 minutes Bath ratio; 1: 5

Then, after washing with hot water, washing with water, dehydration, drying, and rewinding with a normal corn winder, 0.5% of Mary AF-715 oil manufactured by Marubishi Yuka Kogyo Co., Ltd. was used.
Then, the high-strength sewing thread of the present invention was obtained. The performance of the obtained sewing thread was measured, and the results are shown in Table 1.

Example 3 Nylon 6 multifilament 420 used in Example 1
d / 70f using an air processing machine (AT-501EX type) manufactured by Aiki Co., Ltd. equipped with Hemajet 311 type (Heberline, air processing nozzle)
Overfeed rate 7%, air pressure 5kg / cm ² , yarn speed 15
The loop processing was performed by the fluid disturbing process at 0 m / min and a winding overfeed rate of -3% (that is, a stretch rate of 3%). The strength of the obtained loop processed yarn is 5.9.
It was g / d. The number of loops was 42 per 10 cm on average, and the size was 0.5 mm on average, with the diameter of 1.2 mm being large, considering the loop as a circle.

Then, in the same manner as in Example 1, three ordinary twisted yarns of this processed yarn were obtained by a normal ring twisting machine. on the other hand,
Using a covering machine manufactured by Nippon Boshoku Kikai Mfg. Co., Ltd. in advance, 1 around the aramid fiber 375d / 250f of high strength fiber yarn having a strength of 22.1 g / d and a cutting elongation of 2.5%.
A heat-adhesive filament yarn of 00d / 12f was wound around the aramid fiber 1 at a ratio of 1.3 with respect to the aramid fiber to obtain a covering yarn, and in the same manner as in Example 1. The above three twisted yarns of nylon 6 multifilament processed thread are respectively passed through the nip roller 3 and led to the respective slit holes 4a of the twisting guide 4, while on the other hand, a high-strength wound with a thermoadhesive filament thread is wound. The fiber yarn is guided directly into the slit hole 4b of the guide 4 without passing through the nip roller 3 and 350 T / M is twisted in the Z direction together with the above three lower twist yarns to obtain a yarn for sewing. . At this time, the tension sent to the twisting guide 4 for the covering yarn with respect to the nylon 6 lower twist yarn is 1 /
It was set to 4.

Then, this thread for sewing thread is wound up on a soft winder under the same conditions as in Example 2, subjected to scouring, dyeing and fusion treatment, and then subjected to a washing process with hot water, a washing process with water, a dehydration process and a drying process to obtain a corn winder. And rewound to obtain the high-strength sewing thread of the present invention. The winding density with the soft winder at this time is 0.26
g / cm ³ and oil application with corn winder is 0.7
%Met. The performance of the obtained sewing thread was measured, and the results are shown in Table 1.

Comparative Example 1 Using a normal ring twisting machine, 250 d / 170 f of aramid fiber having a strength of 20.5 g / d and a breaking elongation of 4.0% was twisted at 300 T / M in the S direction to obtain a lower twisted yarn. It was Next, as shown in FIG. 1, the three lower twisted yarns are respectively passed through the nip rollers 3 and guided into the slit holes (4a in FIG. 2) of the twisting guide 4, and the upper yarn of 200T / M is moved in the Z direction. Twisting was performed to obtain a thread for sewing thread.

Comparative Example 2 The strength of the high strength fiber yarn in Example 1 was 22.4 g.
/ D, aramid fiber with a breaking elongation of 2.5% 750d / 50
Aramid fiber 75 with a strength of 17.3 g / d and a breaking elongation of 2.3% in place of 0f (manufactured by Enka, trade name: Twaron)
A thread was obtained in the same manner as in Example 1 except that 0d / 500f was used. Table 1 also shows the characteristic evaluation results of the obtained sewing threads of Examples 1 to 3 and Comparative Examples 1 and 2.

[0042]

[Table 1]

As is clear from Table 1, the high-strength sewing threads according to the present invention of Examples 1 to 3 are obtained by covering the high-strength fiber threads with the synthetic fiber threads, whereby the thread strength, the thread breaking tension, the seam strength, etc. Excellent performance in all items. Further, the high-strength sewing threads according to the present invention of Examples 2 to 3 in which the high-strength fiber threads and the synthetic fiber threads are bonded by the heat-adhesive filament thread are more stable because there is no deviation between the high-strength fiber threads and the synthetic fiber threads. The characteristics are shown. Example 3 in which the synthetic fiber yarn was subjected to the fluid disturbing treatment had a large number of loops on the surface, had a soft texture, and had a good fit with the material to be sewn.
On the other hand, the sewing thread of Comparative Example 1 which is made of only the high-strength fiber thread and not covered with the synthetic fiber thread has a high thread strength, but is fluffed during processing or sewing, resulting in thread breakage tension and stitches. It was less powerful. Further, in Comparative Example 2 in which the strength of the high-strength fiber thread was low, the characteristics such as sewing thread strength, thread breaking tension, and stitch strength were poor.

[0044]

As described above, the high strength sewing thread of the present invention is
The high-strength fiber yarn is covered with the twist of the synthetic fiber yarn, and good sewability can be obtained even when sewing under high speed and high tension. In addition, the high-strength sewing thread of the present invention in which the high-strength fiber thread and the synthetic fiber thread are adhered can obtain more stable sewing property. Further, the high-strength sewing thread of the present invention having a large number of loops on the surface can obtain good sewability as well as being excellent in fit with a material to be sewn and capable of forming a more beautiful seam. Is.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a mechanism of a twisting machine used when manufacturing a high-strength sewing thread of the present invention.

2 is an enlarged plan view of a twisting guide 4 used in the twisting machine shown in FIGS. 1 and 5. FIG.

FIG. 3 is a schematic view showing the appearance of an example of a high-strength sewing thread of the present invention.

FIG. 4 is a schematic view showing a cross section of an example of the high-strength sewing thread of the present invention.

FIG. 5 is a schematic explanatory view showing a mechanism of a twisting machine used when manufacturing the high-strength sewing thread of the present invention.

FIG. 6 is a schematic view showing a cross section of an example of the high-strength sewing thread of the present invention.

FIG. 7 is a schematic view showing the appearance of a high-strength sewing thread obtained by subjecting the synthetic fiber thread of the present invention to a fluid disturbing treatment.

[Explanation of symbols]

 1 Synthetic Fiber Thread 2 High Strength Fiber Thread 3 Nip Roller 4 Twisting Guide 4a, 4b Slit Hole 5 Winding Bobbin 6 High Strength Sewing Thread 7 Thermal Adhesive Filament Thread 8 Loop

Claims (3)

[Claims] 1. A high-strength sewing thread, characterized in that a high-strength fiber thread having a strength of 20 g / denier or more is covered with twists of a plurality of synthetic fiber threads. 2. A high-strength fiber yarn having a strength of 20 g / denier or more is covered by twisting of a plurality of synthetic fiber yarns, and the high-strength fiber yarn and the synthetic fiber yarn are bonded to each other by a heat-adhesive filament yarn. High-strength sewing thread characterized by 3. The synthetic fiber yarn is an entangled yarn having a large number of loops on the surface thereof.
High-strength sewing thread described.