JP6320119B2 - Toothed belt fabric - Google Patents

Description

  The present invention relates to a fabric used for a tooth surface of a toothed belt.

  Toothed belts are used in a variety of applications ranging from industrial applications such as driving fuel pumps of automobiles to household appliances. Many tooth portions are arranged along the longitudinal direction of the belt in the belt body in which the core wire is embedded. In order to protect the contact surface with the pulley gear, the tooth surface and the tooth bottom are covered with a woven fabric or the like. The belt body is made of rubber such as urethane rubber, chloroprene rubber, hydrogenated nitrile rubber or the like. The woven fabric is composed of wefts arranged along the length direction of the belt main body and warp yarns arranged in the width direction crossing the weft. This fabric initially has a length that substantially matches the circumference of the toothed belt, but when forming the meshing teeth, it needs to have a length along the tooth profile of the toothed belt, The weft constituting the woven fabric is required to easily extend in the length direction of the toothed belt.

  Therefore, the yarn used as the weft must be stretchable, have a strength that does not break when stretched, and have a durability that does not break when in contact with the pulley gear. In addition, as the performance of automobile engines increases, toothed belts operate under high heat and high load. In order to meet these requirements, wefts of fabrics are generally stretchable. A fabric woven using a non-stretchable yarn such as a nylon yarn is used for the warp of the fabric. Furthermore, in recent years, in order to enable the design of compact automobiles and the like that are more environmentally friendly, it has been demanded to make the engine room compact and, in turn, save space for parts such as gears. Therefore, higher strength, stretchability, and wear strength at the time of contact with the pulley gear are required so that the toothed belt can withstand long-time operation even if the gear is downsized.

  As a woven fabric used for the tooth surface of a conventional toothed belt, for example, Patent Document 1 discloses a coating obtained by winding the crimped yarn around a para-aramid fiber filament crimped yarn or a stretched urethane-based elastic fiber. A woven fabric in which yarns are woven using wefts is disclosed. However, when crimped yarn is used, the stretchability of the fabric in the longitudinal direction of the belt body is imparted, but the tensile strength at the single yarn level is reduced by crimping, and the strong surface and wear strength are reduced. It is insufficient. Moreover, many processes, such as winding and covering the crimped yarn around the stretched urethane elastic fiber, are necessary, and there is a problem that the processing cost is high.

  Patent Document 2 discloses that a stretchable twisted yarn obtained by twisting a urethane-based elastic fiber and a non-elastic fiber-crimped yarn obtained by applying a minute crimp to a para-aramid fiber or the like as a weft, a nylon yarn A woven fabric is disclosed that is woven by using for a warp. Since this woven fabric uses crimped yarn, there is a problem with the strong surface and abrasion strength of the yarn. Further, in the yarn processing method, an independent process for imparting a minute crimp to a para-aramid fiber and the like, and a non-elastic fiber crimp yarn obtained by imparting a minute crimp to a urethane-based elastic fiber and a para-aramid fiber, etc. It is a factor of cost increase that it consists of two independent processes in which the twisting is independent.

  Furthermore, in Patent Document 3, air entangled yarns of nylon and high-strength fibers are wound around urethane elastic fibers as yarns arranged along the length direction of the belt body, and further, nylon yarns are wound around the yarns. And a woven fabric woven using a yarn in which the air entangled yarn is exposed from between nylon yarns. When the meshing teeth of the toothed belt are engaged and disengaged under severe usage conditions, this fabric is greatly deformed in the meshing teeth, especially in a state where a high tension is applied to the fabric at the root of the meshing teeth. It has durability in situations where extremely large wear occurs due to contact and dissociation with the pulley. In other words, the intermediate yarn itself does not have elasticity, but since it is wound in a spiral shape, it can be extended by the extension of the spiral, and further, the anchoring effect of the loop of the air entangled yarn makes it possible to adhere to rubber. It aims to improve. However, since the production process of this yarn is complicated, there is a problem that it is difficult to obtain a yarn having an adjusted elongation at break while maintaining the strength of the yarn.

  Furthermore, in Patent Document 4, the overfeed rate of the core yarn and the sheath yarn is changed so that the core yarn is 1 to 6%, the sheath yarn is 25 to 75%, and the phase in the length direction is shifted partially. A yarn in which a fiber length difference is formed and concentrated to form a bulky processed yarn is disclosed. It is disclosed that a yarn using a polybenzazole fiber, which is a high-strength fiber, as a core yarn has high strength and adhesiveness due to the anchor effect of the loop, and is therefore used as a fabric for a toothed belt. However, since the polyurethane elastic yarn is not used, the breaking elongation of the yarn is as low as 3 to 5%, and it does not have sufficient extensibility to be used as a fabric for a toothed belt.

JP 2004-332160 A Table 2002-092894 JP 2002-168300 A JP 2001-336038 A

  In view of the background of the prior art, the present invention uses a stretchable entangled yarn formed by entanglement of a non-stretchable synthetic fiber filament yarn as a warp and a synthetic elastomer filament yarn and a high strength fiber filament yarn as a weft. In addition to providing excellent stretchability in the longitudinal direction of the belt body, high yarn strength, excellent abrasion resistance of the fabric, and providing a toothed belt fabric with improved adhesion to rubber. To do.

The present invention employs the following means in order to solve such problems.
That is, the present invention is as follows.
(1) A woven fabric for a toothed belt using a stretched entangled yarn as a weft and a non-stretchable synthetic fiber filament yarn as a warp, and the following (a), (b), (c) and (d) : A toothed belt fabric characterized by satisfaction.
(A) Stretch entangled yarn; Stretch entangled yarn formed by entanglement treatment of synthetic elastomer filament yarn and non-crimped para-aramid fiber filament yarn by fluid jet (b) Elongation ratio (B / A); 0.60 <(B / A) <0.97
A: Breaking elongation (%) of stretchable entangled yarn measured at an initial load of 0.00882 cN / dtex,
B: Elongation (%) of stretchable entangled yarn between stresses 0.00882 to 0.0882 (cN / dtex)
(C) A; 50 to 150 (%)
(D) The ratio of the synthetic elastomer filament yarn in the elastic entangled yarn is 7 to 23
mass%
(2) The woven fabric for toothed belt according to (1 ), wherein the entanglement degree of the elastic entangled yarn is 50 to 300.
(3) The toothed belt fabric according to (1) or (2) , wherein the synthetic elastomer filament yarn is a polyurethane elastic yarn.

  The toothed belt fabric of the present invention uses a non-stretchable synthetic fiber filament yarn as the warp and a synthetic elastomer filament yarn and a high strength fiber filament yarn as the weft, within a predetermined breaking elongation and elongation ratio range. Because the elastic entangled yarn that has been entangled is used so that the high-strength fiber filament yarn covers the surface of the synthetic elastomer filament yarn appropriately, the strength and elasticity of the toothed belt fabric In addition to improved durability, wear resistance, and durability, the anchoring effect of the entangled yarn dramatically improves the adhesion to rubber. Since the single fiber constituting the high-strength fiber filament yarn maintains high tensile strength even when entangled by the fluid jet, a high reinforcing effect is obtained for the teeth of the toothed belt. Therefore, the toothed belt fabric of the present invention is suitable for applications that require space saving and high performance, such as a toothed belt for an engine room of an automobile. In addition, high strength fibers such as para-aramid fibers have high heat resistance, and are therefore suitable for in-oil belts requiring high temperature durability.

It is a figure which shows an example of the SS curve of the elastic entangled yarn which concerns on this invention. It is the schematic which shows an example of the manufacturing method of the elastic entanglement yarn which concerns on this invention. It is the schematic of the durability testing apparatus of a belt.

The details of the toothed belt fabric of the present invention will be described below.
In the toothed belt fabric of the present invention, the elastic entangled yarn used as the weft is an elastic entangled yarn formed by entanglement treatment of a synthetic elastomer filament yarn and a high strength fiber filament yarn by a fluid jet. As the entanglement nozzle, a turbulent entanglement nozzle, a rectification entanglement nozzle, or the like can be used. The means for processing high-strength fiber filament yarns into stretchable entangled yarns is not a complicated process, only entangled by fluid jets in this way. Is maintained. Moreover, since the process of the elastic entangled yarn is completed in one step, it is efficient and advantageous in terms of processing cost.

  The synthetic elastomer filament yarn is preferably a polyurethane-based elastic yarn that can impart stretchability to the entangled yarn, is easy to entangle, and has high elasticity. The cross-sectional shape of the polyurethane elastic yarn is not particularly limited, and may be circular or flat. The fiber may be a monofilament or a welded multifilament. .

  The fineness of the polyurethane elastic yarn is preferably in the range of 40 to 940 dtex, and more preferably in the range of 100 to 350 dtex. If it is 40 dtex or more, there is no risk of thread breakage in the entanglement process and weaving process. On the other hand, if it is 940 dtex or less, the tooth surface when the tooth surface of the toothed belt is coated with the woven fabric. The uniformity of the above is not impaired.

  The breaking elongation of the polyurethane elastic yarn is preferably 300% or more, and if it is less than 300%, it becomes difficult for the stretchable entangled yarn to exhibit a predetermined breaking elongation.

  As the high-strength fiber filament yarn, a high-strength fiber filament yarn having a tensile strength measured according to JIS L 1013 8.5 of 17 cN / dtex or more is preferably used as a characteristic of the raw yarn. The reason why the tensile strength is set to 17 cN / dtex or more is that if it is less than this, a fabric for a toothed belt having high strength and high durability cannot be obtained. Preferably, it is about 17 cN / dtex to 35 cN / dtex.

  The fineness of the high-strength fiber filament yarn may be appropriately selected for the purpose of obtaining a thickness and strength necessary for a woven fabric for a toothed belt, but is preferably 55 to 3400 dtex. More preferably, it is 110-1000 dtex, More preferably, it is 110-500 dtex. If it is less than 55 dtex, it is difficult to obtain strength as a fabric for a toothed belt. When it exceeds 3400 dtex, it becomes a woven fabric exceeding the thickness normally used as a woven fabric for a toothed belt. The fineness of the single fiber filament constituting the high-strength fiber filament yarn is preferably 0.3 to 4 dtex, more preferably 1.0 to 2.5 dtex. If it is less than 0.3 dtex, the strength of the single fiber is low and the rubber reinforcement effect of the timing belt cannot be said to be sufficient. If it exceeds 4 dtex, the rigidity of the single fiber is high and the entanglement by the fluid jet is insufficient.

  Specific examples of the high-strength fiber include para-aramid fiber (polyparaphenylene terephthalamide fiber (trade name Kevlar (registered trademark) manufactured by Toray DuPont), copolyparaphenylene-3,4'-diphenyl ether terephthalamide fiber ( Teijin Techno Products, trade name Technora), polyarylate fiber (Kuraray, trade name Vectran), PBO fiber (Toyobo, trade name Zylon), etc. These high strength fibers may be used alone, Two or more kinds of fibers may be used, among which the thermal decomposition starting temperature is 400 ° C. or more and the limiting oxygen index (LOI) is 25 or more, and from the viewpoint of use as a fabric for toothed belts, heat resistance and cut resistance Para-aramid fibers with excellent creativity are desirable, and more preferably, they have a low shrinkage rate at high temperatures and excellent heat shrink characteristics. Because they are are polyparaphenylene terephthalamide fibers it is desirable.

  The elastic entangled yarn of the present invention formed by entanglement treatment of a synthetic elastomer filament yarn and a high-strength fiber filament yarn with a fluid jet has an elongation at break measured by an initial load of 0.00882 cN / dtex (FIG. 1). It is important that A) shown in the SS curve of the elastic entangled yarn is in the range of 50 to 150%. That is, the elongation from the low stress region to the fracture is important. The toothed belt fabric needs to have a length that extends along the tooth profile of the toothed belt when the meshing teeth are formed. However, if the breaking elongation of the elastic entangled yarn is less than 50%, the fabric The weft that constitutes may impair the extension of the toothed belt in the length direction. In addition, the elastic entangled yarn used as the weft when weaving the toothed belt fabric needs to be properly stretched and uniformly disposed on the fabric surface, but does not fully extend when the breaking elongation exceeds 150%. The portion may partially become a thick thread and appear on the fabric surface, which may impair the smoothness of the toothed belt fabric. The breaking elongation is more preferably 60 to 140%, particularly preferably 70 to 130%.

Furthermore, in the stretchable entangled yarn of the present invention, elongation in a low stress region is important when weaving a woven fabric for a toothed belt having smooth and uniform shrinkage. Fig. 1: A shown in the SS curve of the elastic entangled yarn is A, the elongation at break of the elastic entangled yarn measured at an initial load of 0.00882 cN / dtex, and B is the stress of the elastic entangled yarn, 0.00882-2. When the elongation is between 0882 (cN / dtex), the ratio of the elongation B in the low stress region to the breaking elongation A (elongation ratio; B / A) is 0.60 <(B / A) < It is important that it is 0.97. More preferably, 0.70 <(B / A) <0.96, and still more preferably 0.80 <(B / A) <0.95.

  The toothed belt fabric needs to have a length along the tooth profile of the toothed belt when it is formed into a meshed tooth, but if the elongation ratio (B / A) is less than 0.60, the fabric The weft that constitutes may impair the extension of the toothed belt in the length direction. On the other hand, the elastic entangled yarn used as the weft when weaving the toothed belt fabric needs to be properly stretched and uniformly disposed on the fabric surface, but the elongation ratio (B / A) is 0.97. If it exceeds the upper limit, the portion that does not stretch appears as a partial thick thread on the fabric surface, which may impair the smoothness of the toothed belt fabric.

The ratio of the synthetic elastomer filament yarn or the high strength fiber filament yarn may be adjusted so that the ratio of the synthetic elastomer filament yarn to the stretch entangled yarn is within the above range. Preferably in the range of 7-23 wt%. When the ratio of the synthetic elastomer filament yarn is less than 7 % by mass, the shrinkage stress of the elastic entangled yarn is insufficient, and it tends to be difficult to impart elongation to the elastic entangled yarn. On the other hand, when it exceeds 23 % by mass, the strength of the stretchable entangled yarn tends to decrease and the shrinkage stress tends to be excessive.

  The stretchable entangled yarn according to the present invention is manufactured using a fluid processing nozzle such as a known Taslan nozzle or interlace nozzle, and supplies a synthetic elastomer filament yarn and a high-strength fiber filament yarn to a processing apparatus equipped with a fluid processing nozzle. And entangled with a fluid jet. By increasing the degree of entanglement in the entanglement process, synthetic elastomer filament yarns with poor tensile strength are covered with high strength fiber filament yarns with excellent tensile strength, and the proportion of synthetic elastomer filament yarns exposed on the fabric surface is reduced. As a result, the abrasion resistance of the fabric and the durability of the belt can be improved. Moreover, adhesiveness with rubber | gum can be improved by increasing the number of loops moderately.

An example of the processing method of the elastic entangled yarn according to the present invention is shown in FIG. The synthetic elastomer filament yarn 1 is stretched between the feed roller 4 and the feed roller 5 and supplied to the fluid processing nozzle 7. The high-strength fiber filament yarn 2 is supplied to the fluid processing nozzle 7 through the feed roller 6, entangled with the synthetic elastomer filament yarn 1 by the air jet of the fluid processing nozzle 7, and wound through the delivery roller 8. It is wound around the package 3 by the take-up roller 9. The high strength fiber filament yarn 2 may be supplied from one raw yarn bobbin or may be supplied from a plurality of raw yarn bobbins. The high-strength fiber filament yarn 2 may be one type, or may be combined by supplying two or more different materials to the fluid processing nozzle. The ratio of stretching the synthetic elastomer filament yarn 1 is expressed by the draft magnification as follows.
Draft magnification = (surface speed of feed roller 5) / (surface speed of feed roller 4)

  The draft ratio of the synthetic elastomer filament yarn is 2.5 to 5, preferably 2.5 to 3.5. When the draft magnification is less than 2.5, the stretchable entangled yarn has a low elongation in the low stress region and is not suitable as a stretchable entangled yarn for a toothed belt fabric. When the draft magnification exceeds 5, the synthetic elastomer filament yarn is cut in the process of the elastic entangled yarn, or the shrinkage force of the elastic entangled yarn is too strong to be fully extended in the weaving process, and the toothed belt fabric is smooth. Inconveniences that impair the performance.

When the high-strength fiber filament yarn 2 is entangled integrally with the synthetic elastomer filament yarn 1 by an air jet in the fluid processing nozzle 7, a loose state is desirable. For this purpose, the surface speed of the delivery roller 8 may be made slower than the surface speed of the feed roller 6. Looseness is expressed as an overfeed rate. On the other hand, the overfeed rate of the synthetic elastomer filament yarn 1 is represented by a difference in surface speed between the feed roller 5 and the delivery roller 8.
Overfeed rate (%) = (Vf−Vd) × 100 / Vd
Vf: surface speed of feed roller 5 or 6
Vd: surface speed of the delivery roller 8

  In the production of the stretchable entangled yarn according to the present invention, the preferred overfeed rate is 10% or less for the synthetic elastomer filament yarn and the high strength fiber filament yarn. More preferably, it is 0.2-5%, More preferably, it is 0.3-3%. When the overfeed rate is 10% or more, the entanglement of the elastic entangled yarn is too strong, the elongation in the low elongation region is lowered, and may not be suitable as the elastic entangled yarn for the toothed belt fabric.

  The overfeed rate of the feed roller 5 and the overfeed rate of the feed roller 6 may be the same or different, depending on the entanglement state of the stretchable entangled yarn, workability, the rate of elongation in the low stress region, etc. Adjust it.

  The pneumatic pressure of the fluid processing nozzle is preferably in the range of about 0.2 to 1.0 MPa, preferably 0.4 to 0.6 MPa. In the entangled yarn by the fluid jet, the high-strength fiber filament yarns are entangled with each other and overlap to form a loop, so that the anchoring effect of the loop can improve the adhesion to rubber.

  As for the entanglement degree of the elastic entanglement yarn used for the fabric for toothed belts of this invention, 50-300 are preferable. More preferably, it is 80-250. When the degree of entanglement is less than 50, the high-strength fiber filament yarn single fibers are not entangled with each other, or the synthetic elastomer filament yarn and the high-strength fiber filament yarn are not sufficiently entangled. The yarn may break or the high-strength fiber filament yarn may become fluffy. When the entanglement degree exceeds 300, the entanglement between single fibers of the high strength fiber filament yarn or the entanglement of the synthetic elastomer filament yarn and the high strength fiber filament yarn is too strong, and the elasticity necessary for the fabric for the toothed belt is obtained. It may be damaged.

  The stretchable entangled yarn thus obtained is measured for tensile strength and elongation by a tensile test method described later. As the high strength fiber filament yarn before fluid processing, a high strength fiber filament yarn having a tensile strength of 17 cN / dtex or more is used. The high-strength fiber filament yarn before fluid processing is a state in which each single fiber filament constituting the yarn is aligned straight and has no sagging, and if necessary, a slight twist is applied to align each single fiber. A tensile test is performed to measure the tensile strength. However, in the stretchable entangled yarn processed by the fluid processing nozzle, each single fiber constituting the high-strength fiber filament yarn is entangled and sagging, so that the apparent tensile strength of the stretchable entangled yarn is low. When the tensile strength of the high-strength fiber filament yarn single fiber taken out from the elastic entangled yarn is measured, the strength close to the tensile strength before fluid processing is maintained.

  In the toothed belt fabric according to the present invention, the synthetic fiber filament yarn used as the warp is a multifilament composed of two or more single fibers, as long as it is nylon fiber, polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl alcohol. One type selected from fibers or a combination of a plurality of fibers can be used. Nylon fibers and polyester fibers are preferred because of their high strength and elongation. Of these, nylon fiber is most suitable from the viewpoint of tensile strength.

  The thickness of the synthetic fiber filament yarn may be arbitrarily selected according to the required characteristics of the finally obtained woven fabric, but considering that a high degree of durability is required by the toothed belt, A fineness of 30 to 3300 dtex is used. More preferably, it is 50-1000 dtex, More preferably, it is 100-500 dtex.

  When weaving the woven fabric for toothed belt of the present invention, the woven fabric may be woven into a woven fabric having a desired structure, such as plain weave, twill weave, and satin weave. Among them, a 2/2 twill weave structure is preferable because it is flexible and easily follows the tooth profile.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

  The evaluation method of each physical property was based on the following method.

[Tensile strength of yarn]
Measured according to JIS L 1013: 2010 Chemical fiber filament yarn test method 8.5.

[Tensile strength and elongation of elastic entangled yarn]
Measured according to JIS L 1013: 2010 chemical fiber filament yarn test method 8.5 tensile strength and elongation. In order to measure the elongation under a low load, the elastic entangled yarn was not twisted and the initial load was set to 0.00882 cN / dtex.

[Tensile strength of single fiber]
JIS L 1015: 1999 Chemical fiber staple test method 8.7 Tensile strength and elongation rate were used to measure single fiber tensile strength. The measurement conditions are a constant speed extension type testing machine, a grip interval of 20 mm, and a pulling speed of 20 mm / min.

[Degree of confounding]
JIS L 1013: 2010 Chemical fiber filament yarn test method The degree of entanglement was measured according to 8.15 degree of entanglement. However, the elastic entangled yarn contains synthetic elastomer filaments and has a large shrinkage under low load, making it difficult to measure the degree of entanglement. Therefore, the weight suspended from the grip of the sample drooping device 1 m below is 0.0882 cN / dtex was used. Degree of entanglement = 100 / hook descending distance (cm).

[Durability of belt]
The measurement was performed using a belt durability tester schematically shown in FIG. Hook the toothed belt on the driven pulleys 12 and 13, the driving pulley 11 and the auto tensioner 14, and rotate the driving pulley at a speed of 4000 (times / min) in an environment of 100 ° C to crack the teeth and chip the teeth. The time until the time when the belt function could not be performed was obtained.

Example 1
Polyurethane elastic yarn having a total fineness of 156 dtex and a breaking elongation of 530% (manufactured by Toray Operontex Co., Ltd., trade name “Lycra” (registered trademark)); 65 dtex) and a polyparaphenylene terephthalamide fiber (trade name “Kevlar” (registered trademark) manufactured by Toray DuPont Co., Ltd.) having a tensile strength of 20.3 cN / dtex are simultaneously supplied to a Taslan type nozzle. A stretchable entangled yarn having the tensile strength and breaking elongation shown in 1 was formed. Prior to the supply to the Taslan type nozzle, the polyurethane elastic yarn was drafted 3 times. The overfeed rate of the feed roller was 1.5% for both the polyurethane elastic yarn and the polyparaphenylene terephthalamide fiber. The air jet pressure was 0.6 MPa.

  Using a nylon 6 filament yarn having a tensile strength of 5 cN / dtex (total fineness of 230 dtex, number of filaments of 60) as a warp, using the above-described stretchable entanglement yarn as a weft, weaving a fabric of a fabric structure 2/2 twill, Scouring was performed by a conventional method at a scouring bath temperature of 95 ° C. to obtain a woven fabric having a warp density of 160 (lines / 5 cm) and a weft density of 130 (lines / 5 cm). This fabric was subjected to an epoxy treatment and then an RFL (resorcin-formalin-latex) adhesion treatment to prepare an adhesion-treated fabric.

  In addition, a belt core wire adjusted as follows was used. Three glass fibers of ECG150 are aligned, treated with RFL solution, air-dried and heat-treated at 280 ° C. for 1.5 minutes, and then twisted by twisting at a rate of 12/10 cm each in the S and Z directions. Eleven strands were prepared, and the strands with the lower twist in the S direction were twisted in the Z direction, and the strands with the lower twist in the S direction were twisted at a ratio of 8 times / 10 cm in the Z direction.

  The bonded fabric is made into an endless cylindrical shape with the weft yarn in the circumferential direction, set in a mold with a tooth cut, and wound around the fabric so as to alternately arrange S-twisted and Z-twisted core wires, Further, a rolled rubber sheet was wound from above and pressurized and vulcanized to produce a sleeve-shaped molded product. By cutting this to a predetermined width, the core wire is wound around a spiral in the belt circumferential direction at a pitch of 1.45 mm, and has a tooth width of 19.1 mm with a tooth number of 163 teeth and a tooth pitch of 8 mm. I got a belt.

  The durability time of the obtained toothed belt was 1140 hours, and the durability was good.

(Example 2)
A stretchable entangled yarn was formed under the same conditions as in Example 1 except that the total fineness of the polyparaphenylene terephthalamide fiber (“Kevlar” (registered trademark)) was 220 dtex. Using this stretchable entangled yarn as the weft, a toothed belt was obtained in the same manner as in Example 1. The durability time of the obtained toothed belt was 950 hours and the durability was good.

(Example 3)
A stretchable entangled yarn was formed under the same conditions as in Example 1 except that an interlace nozzle was used instead of the Taslan type nozzle. Using this stretchable entangled yarn as the weft, a toothed belt was obtained in the same manner as in Example 1. The durability time of the obtained toothed belt was 1120 hours and the durability was good.

(Comparative Example 1)
A stretchable entangled yarn was formed under the same conditions as in Example 1 except that the draft ratio of the polyurethane elastic yarn was set to 2. As in Example 1, as a result of weaving using nylon 6 filament yarn as warp and using the above-mentioned stretchable entanglement yarn as weft, this fabric is stretched in the belt length direction when the meshing teeth of the toothed belt are formed. The margin was insufficient, and elongation deformation along the unevenness of the meshing teeth could not be obtained, which was not suitable as a toothed belt fabric.

(Comparative Example 2)
A stretchable entangled yarn was formed under the same conditions as in Example 1 except that the draft ratio of the polyurethane elastic yarn was 5.5. As in Example 1, as a result of weaving using nylon 6 filament yarn as the warp and using the above-mentioned stretchable entangled yarn as the weft, the stretchable entangled yarn has high contractibility during weaving, so the weft is not uniformly stretched. As a woven fabric for a toothed belt, it became a woven fabric having inconvenient irregularities.

(Comparative Example 3)
Elastic entanglement under the same conditions as in Example 1 except that nylon 6 fiber (total fineness 460 dtex, number of filaments 120) was used instead of polyparaphenylene terephthalamide fiber (“Kevlar” (registered trademark)) A yarn was formed. Using this stretchable entangled yarn as the weft, a toothed belt was obtained in the same manner as in Example 1. The durability time of the obtained toothed belt was about 1/10 of that of Example 1.

  The results of Examples 1 to 3 and Comparative Examples 1 to 3 are summarized in Table 1.

  The fabric for a toothed belt of the present invention is useful as a fabric used for a tooth surface of a toothed belt used in various applications from industrial use to household appliances.

DESCRIPTION OF SYMBOLS 1 Synthetic elastomer filament yarn 2 High-strength fiber filament yarn 3 Package 4 Feed roller 5 Feed roller 6 Feed roller 7 Fluid processing nozzle 8 Delivery roller 9 Winding roller 11 Drive pulley 12 Drive pulley 13 Drive pulley 14 Auto tensioner

Claims (3)

A woven fabric for a toothed belt using a stretched entangled yarn as a weft and a non-stretchable synthetic fiber filament yarn as a warp, and satisfying the following (a), (b), (c) and (d) A woven fabric for toothed belts.
(A) Stretch entangled yarn; Stretch entangled yarn formed by entanglement treatment of synthetic elastomer filament yarn and non-crimped para-aramid fiber filament yarn by fluid jet (b) Elongation ratio (B / A); 0.60 <(B / A) <0.97
A: Breaking elongation (%) of stretchable entangled yarn measured at an initial load of 0.00882 cN / dtex,
B: Elongation (%) of stretchable entangled yarn between stresses 0.00882 to 0.0882 (cN / dtex)
(C) A; 50 to 150 (%)
(D) The ratio of the synthetic elastomer filament yarn in the elastic entangled yarn is 7 to 23% by mass The woven fabric for a toothed belt according to claim 1, wherein the entanglement degree of the elastic entangled yarn is 50 to 300. 3. The toothed belt fabric according to claim 1, wherein the synthetic elastomer filament yarn is a polyurethane elastic yarn.

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