JP4898633B2 - Elastic cloth, cover cloth for toothed belt - Google Patents

Description

  The present invention relates to a stretchable base fabric used for a heat-resistant composite member such as a resin / woven fabric composite or a concrete / woven fabric composite.

  In a resin / woven fabric composite based on a woven fabric, such as a tarpaulin, a toothed belt, or a flat belt, the base fabric may be required to be stretchable. The reason why stretchability is required is to absorb the tension applied to the base fabric in the manufacturing process of the composite and fix the base fabric in a desired shape in the composite, or to give the composite itself stretchability, Is mentioned.

Examples of the former include a cover fabric for a toothed belt, a fabric bellows (bellows) fabric, a composite structural member for various structures such as aircraft and ships, and concrete reinforced with a woven fabric.
For example, a toothed belt is used in various mechanical devices because it reliably transmits rotational driving force. However, when it is used for high-speed driving in a high-temperature environment such as an automobile, heat resistance and low noise are required. The For this reason, in particular, a cover cloth for a toothed belt for a cover cloth embedded in a surface portion that is in direct contact with a pulley is required to have cushioning properties necessary for heat resistance and low noise. Furthermore, the cover fabric for a toothed belt is required to have stretchability that can follow the sharp bending shape of the tooth portion and the tooth bottom portion.

  For this reason, the use of heat-resistant functional fibers such as aramid fibers has been studied as a material for the cover fabric for toothed belts. In addition, since yarns made of heat-resistant functional fibers are generally highly elastic and not sufficiently stretchable, the use of filament false twisted yarn is disclosed in order to impart stretchability to the toothed belt cover fabric (for example, Patent Document 1). Alternatively, the use of a covering spun yarn using a urethane elastic yarn as the core yarn is disclosed (for example, see Patent Document 2).

  However, the filament false twisted yarn has a low bulk in a compressed state or in an extended state, and for example, the bulk is reduced and flattened due to the extension during the application process to the tooth portion and the tooth bottom portion, and the cushioning property is insufficient. Further, the covering spun yarn has a problem that the core yarn is deteriorated due to heat at the time of pasting and use because the core yarn has no heat resistance.

  Accordingly, there is a demand for a toothed belt cover fabric using a thread consisting only of spun yarns, which is excellent in heat resistance, stretchability and cushioning properties in the extending direction during processing.

  Examples of the latter include fabrics for membrane structures such as hoses, airbags, and tents used for fluid transfer, and fabrics for heat-resistant protective clothing.

The base fabric used for the above uses is required to have heat resistance as well as stretchability as described above, but the yarn made of functional fibers used for the base fabric is generally highly elastic and does not have sufficient stretchability. The stretchability of the base fabric used was not sufficient.
JP 2004-332160 A Japanese Patent Laid-Open No. 5-118387

  An object of the present invention is to provide a base fabric excellent in heat resistance and stretchability used for heat resistant composite members such as resin / woven fabric composites and concrete / woven fabric composites.

  The gist of the present invention is a base fabric used for a heat-resistant composite member, in which a plurality of span yarns made of heat-resistant functional fibers are combined and twisted in a direction opposite to the original twist direction of the span yarn. After heat setting, then combine a plurality of spun yarns made of heat-resistant functional fibers with one yarn over-twisted in the original twist direction, and heat set after twisting in the original twist direction of the span yarn Next, a woven fabric in which other yarns that have been untwisted in the opposite direction to the original twisting direction are alternately arranged every one or two yarns in at least one direction selected from warps and wefts. It is to be a stretchable cloth made of

  In the stretchable fabric, the one yarn may have a twist coefficient of 12 to 16 opposite to the original twist direction of the spun yarn, and a remaining twist coefficient of 2.5 to 3.5. Of the spun yarn may have a twist coefficient of 9 to 13 and a residual twist twist coefficient of 2.4 to 4.0.

  In the stretchable fabric, the cover factor of the one-way yarn may be 11.4 to 13.6, and the yarn of the direction intersecting the one-way yarn is set to 5N in the direction of the one-way yarn. The cover factor in the stretched state with a load of / 3 cm may be 3.0 to 5.5.

  In the stretchable fabric, an extension stress at 100% extension along the direction of the one-way yarn may be 3 N / 3 cm or less.

  The heat-resistant functional fiber may be a meta-aramid fiber, and the heat set may be due to steam heating.

  The gist of the present invention is a cover for a toothed belt comprising the stretchable fabric, wherein the one yarn and the other yarn are used as a one-way woven yarn selected from warp and weft. It is to be cloth.

  ADVANTAGE OF THE INVENTION According to this invention, the elastic cloth excellent in heat resistance and elastic property used for the base fabric of heat-resistant composite members like a resin / woven fabric composite and a concrete / woven fabric composite is provided.

  According to the present invention, for a toothed belt that does not include a material that is easily heat-degraded, using a thread consisting only of a spun yarn that has excellent heat resistance, stretchability, and cushioning properties in the elongation direction during processing. A cover fabric is provided.

The stretchable fabric of the present invention combines a spun yarn using heat-resistant functional fibers as a weft or warp, twists the spun yarn in the direction opposite to the original twist (usually the Z direction), and then heat sets One yarn over-untwisted in the original twist direction and another yarn that was spun and spun in the original twist direction and then heat-set and then over-twisted in the opposite direction to the original twist direction It consists of woven fabrics arranged alternately every other one or two. In the present specification, over-untwisting means twisting in a direction opposite to the twisting direction after twisting at a predetermined twist number T ₁ (T / 25.4 mm), including a combined yarn in which a plurality of yarns are aligned. It performed in the twist number T _{2 (T} / 25.4mm), so that its doubling in the beginning of the twisting direction opposite twisting means twisting the twist direction opposite to the direction as remain. The T ₂ and twist number over solutions. T ₂ -T ₁ is substantially equal to the remaining number of twists of the yarn after overtwisting.

  The number of twists of the yarn and the number of remaining twists are values measured under a predetermined tensile load. This load is 7.5 g when the yarn is 20S (cotton count), and is a load proportional to the linear density (reciprocal of the count) of the yarn.

  The stretchable fabric of the present invention is obtained by thermally shrinking a living machine woven using such a yarn as a weft or warp. This contraction may be free contraction. Alternatively, it may be contracted to a certain width using a tenter or the like. It is preferable that the heat shrinkage is caused by wet heat in order to shrink the living machine uniformly and the surface smoothly. More preferably, the shrinkage is caused by hot water or hot water of 40 ° C. or higher. Most preferably, the shrinkage is caused by hot water at 80 ° C. or higher. In the case of using other contraction means, it is preferable that the contraction means causes contraction with a contraction rate equivalent to that due to wet heat.

  Furthermore, the stretch fabric according to another aspect of the present invention can be obtained by thermally shrinking a raw machine woven using such yarns as wefts and warps.

  Further, in the present invention, when a fabric having a high basis weight or a large thickness is required, a multiple woven fabric structure (for example, 2 to 4 double woven fabric) can be applied.

  In this yarn, the spun yarn curls like a spring and has excellent stretchability, and the stretchable fabric of the present invention can be obtained using this yarn. Further, even if the yarn is compressed in the stretched state, the fiber bundle is not easily crushed. Therefore, the toothed belt cover fabric using the stretchable fabric has excellent cushioning properties. Furthermore, since there is no mixed material such as urethane fiber which is easily deteriorated by heat, there are very few symptoms of heat deterioration due to temperature during processing and use.

  When the stretchable cloth of the present invention is used as a cover cloth for a toothed belt, it has a stretchability capable of following a sharp bent shape of a tooth portion and a root portion. A belt having good durability is obtained. Furthermore, the cushioning property required for low noise properties can be obtained by the spun yarn structure. In this toothed belt cover fabric, it is preferable to use a normal non-stretchable spun yarn as the yarn intersecting with this yarn.

  In addition, the fabric using the spring-curled yarn tends to have irregularities on the surface. In the present invention, the Z-twisted yarn and the S-twisted yarn are alternately arranged in parallel every other one or two. Since an appropriate twisting condition and weaving density have been found, a stretchable fabric with less unevenness on the surface can be obtained. The state of being alternately arranged every other one or two alternates every other (SZSZ...), Every other two (SSZZSSZZ...), Every two every two alternates. (SZZSSZSZZSSZ ...) and the like.

  The spun yarn count used for the yarn is preferably 10 to 40S (cotton count). The number of spun yarns is preferably 2 or more, but may be 3 or more. The number of the spun yarn count and the number of the combined yarns are determined by the required fabric weight or thickness of the stretchable fabric.

  The number of twists in the case where the spun yarn before twisting is a single yarn (original twist: Z twist) with a count of 20S (cotton count) and twisted by twisting two of them will be described below.

The number S ₁ of twists in the S direction for obtaining the one yarn is preferably 30 to 51 T / 25.4 mm (twist coefficient: 9.5 to 16). S ₁ is more preferably 38 to 51 T / 25.4 mm (twisting coefficient: 12 to 16) in order to flatten the surface of the fabric. Preferable for it twist number Z ₁ over-untwisting after twisting in the S direction is 1.1 to 1.25 times the number of twisting of the S direction to flatten the surface of the fabric. In order to flatten the surface of the woven fabric, the number of remaining twists after over-twisting is preferably 7.6 to 10.2 T / 25.4 mm (twisting coefficient: 2.4 to 3.2). It is still more preferable that it is 8.1-9.4T / 25.4mm (twist coefficient: 2.5-3.0). The other twisting number _{Z 2} in the Z direction to obtain the yarn 25~41T / 25.4mm (twist coefficient: 7.9 to 13) is preferably. Z ₂ is more preferably 28 to 41 T / 25.4 mm (twisting coefficient: 9 to 13) in order to flatten the surface of the woven fabric. Preferable for it twist number S ₂ over-untwisting after twisting in the Z direction is 1.2 to 1.4 times the number of twisting the Z direction to flatten the surface of the fabric. In order to flatten the surface of the woven fabric, the number of remaining twists after over-twisting is preferably 7.6 to 12.6 T / 25.4 mm (twisting coefficient: 2.4 to 4.0). Still more preferably, it is 8.4 to 11.4 T / 25.4 mm (twisting coefficient: 2.6 to 3.5). The remaining number of twists is the number of twists required to twist back the yarn after overuntwisting to a state where the number of twists is zero.

S ₁ is 30T / 25.4 mm (twist coefficient: 9.5) is less than, the fabric along the direction of the one yarn after being free shrink at 90 ° C. or more hot water elongation (otherwise Unless otherwise noted, the following is simply referred to as the elongation of the woven fabric), which is not preferable because it is 100% or less. S ₁ is 51T / 25.4 mm (twist coefficient: 16) exceeds the yarn kink is generated undesirably. S ₁ is 38~51T / 25.4mm (twist coefficient: 12.0 to 16) in view of the other conditions that are able to elongation of the fabric than 160% preferred. Furthermore, _{S 1} is 46~49T / 25.4mm (twist coefficient: 14.6 to 15.5) and an elongation of the fabric in view of the other conditions can be from 250 to 300%, and The stretch load at the time of 100% stretching of the woven fabric along the direction of the one yarn can be 3N / 3 cm or less, and is most preferable. When the stretch load at 100% elongation of the woven fabric is 3 N / 3 cm or less, when the stretchable fabric of the present invention is used as a cover fabric for a toothed belt, the toothed belt processability is good and a sharp tooth shape is obtained. preferable.

  The elongation is represented by ((L2-L1) / L1) × 100 (%), where L1 is the length of the fabric load (initial load) at 500 mN / 3 cm and L2 is the length when stretched. Value.

If Z ₂ is less than 25T / 25.4 mm (twisting coefficient: 7.9), the elongation of the woven fabric after free shrinking with hot water of 80 ° C. or higher is 100% or less, which is not preferable. Z ₂ is 42T / 25.4 mm (twist coefficient: 13.3) exceeds the yarn kink is generated undesirably. Z ₂ is 30~41T / 25.4mm (twist coefficient: 9.5 to 13.0) in view of the other conditions that are able to elongation of the fabric than 160% preferred. Further, _{Z 2} is 36~41T / 25.4mm (twist coefficient: 11.4 to 13.0) to be in balance with other conditions can be the elongation of the fabric 250 to 300 percent, and The stretch load at the time of 100% stretching of the woven fabric along the direction of the one yarn can be 3N / 3 cm or less, and is most preferable.

S ₁ is 30~51T / 25.4mm (twist coefficient: 9.5 to 16), the yarn _{Z 1} is even 1.1 to 1.25 times the _{S 1,} having a torque in one direction, For example, a woven fabric using only a yarn that has been untwisted after twisting in the S direction as a weft or warp is unfavorable because it becomes a wrinkled shrinkage state after heat shrinkage and the elongation is less than 150%.

S ₁ is 30~51T / 25.4mm (twist coefficient: 9.5 to 16) even, _{Z 1} is When it is 1.1 times less than _{S 1,} after heat shrinkage of the surface of the fabric unevenness of This is not particularly favorable in terms of points. If it is a value exceeding 1.25 times, it cannot be said that it is particularly preferable in that the elongation of the fabric is low. Z ₁ is most preferably 1.14 to 1.2 times that of S ₁ in order to flatten the surface of the fabric after heat shrinkage.

Z ₂ is 25~41T / 25.4mm (twist coefficient: 7.9 to 13.0) even when _{S 2} is less than 1.2 times the _{Z 2,} after heat shrinkage fabric surface It is not particularly preferable in terms of unevenness. A value exceeding 1.4 times is not particularly preferable in that the elongation of the fabric is low. Z ₁ is most preferably 1.25 to 1.35 times that of S ₁ in order to flatten the surface of the fabric after heat shrinkage.

  When the spun yarn before twisting is a single yarn of 20S (cotton count) (twisted in the S direction), when the above-mentioned spun yarn is a single yarn twisted in the Z direction, Needless to say, the number of twists may be applied by reversing the twist direction in which the yarn is twisted.

  The yarn weaving density of this fabric using the above-twisted and over-twisted yarn (torque yarn) in one direction after heat shrinkage or after finishing including heat shrink treatment is It is preferable that it is 21-46 / 25.4mm (cover factor: 6.6-14.6). If the woven density is less than 21 pieces / 25.4 mm (cover factor: 6.6), the woven fabric has a noticeably undesirable wrinkled irregularity after heat shrinkage. If this weave density exceeds 46 / 25.4 mm (cover factor: 14.6), the shrinkage of the torque yarn during the hot water treatment is limited, and the elongation of the fabric is not sufficient. The woven density is most preferably 36 to 43 pieces / 25.4 mm (cover factor: 11.4 to 13.6) in order to flatten the surface of the fabric and increase the elongation.

  The number of twists when the number of spun yarns before twisting and the number of combined yarns are different are the total number of yarns after the combined yarns (for example, the number of the spun yarn before twisting (cotton count) divided by the number of combined yarns) It is preferable to employ the number of twists that is the same as the above case. As for the weaving density, it is preferable to employ a weaving density such that the cover factor is the same as that in the above case.

  That is, corresponding to the twist number N (T / 25.4 mm) of the above-mentioned case that uses 20 counts × 2 pieces, the twist number M (T / 25.4 mm) in the case of H count (cotton count) × P uses. ) Is M = N · √ (H / P) / √10. The twist coefficient K is given by K = N / √ (H / P). In addition, the weave density WX (lines / 25.4 mm) when using H count × P corresponding to the density W (lines / 25.4 mm) of the above case is WX = W · √ (H / P) / √10. Usually, it is preferable to use two single yarns of 15 to 30S. The cover factor CF is given by CF = WX / √ (H / P).

  That is, in the present invention, the density of the woven yarn in the direction crossing the torque yarn of the woven fabric after heat shrinkage or after finishing processing including heat shrinkage treatment is a cover factor of 9.5 to 15.2 (for example, 20 In the case of the use of 2S count yarn, 30 to 48 yarns / 25.4 mm) is preferable in order to obtain the smoothness and great elongation of the surface of the fabric after heat shrinkage. If the woven density is less than 6.6, the woven fabric is noticeably not noticeable after heat shrinkage. The cover factor is more preferably 11.1 to 13.3. When the woven density exceeds the cover factor: 14.6, the shrinkage of the torque yarn during the hot water treatment is restricted, and the elongation of the fabric is not sufficient. This weave density is most preferably a cover factor of 11.4 to 13.6 in order to flatten the surface of the fabric and increase the elongation.

  In consideration of heat shrinkage, the on-machine set weave density of the yarn in the direction intersecting with the torque yarn is preferably a cover factor of 1 to 10. If this cover factor is below the lower limit of this range, the fabric tends to be misaligned, and the strength in the direction crossing the torque yarn as the structural material base fabric may not satisfy the standard. When this cover factor exceeds the upper limit of this range, the shrinkage of the torque yarn during the hot water treatment is restricted, and the elongation of the fabric is not sufficient. In addition, generation of wrinkles after heat shrinkage of the fabric becomes remarkable. A cover factor of 2.5 to 7.6 is more preferable for obtaining smoothness and large elongation of the surface of the fabric after heat shrinkage. The cover factor is more preferably 3.0 to 5.5. As a result, the cover factor of the yarn in the direction crossing the torque yarn of the fabric after heat shrinkage when stretched in the direction of this yarn is 2.5 to 7.6. This is preferable in that the surface of the fabric is flat and the elongation is large. The range of 3.0 to 5.5 is most preferable in that the surface of the fabric after heat shrinkage is flat and the elongation is large. This stretched state of the fabric refers to a state in which the fabric is stretched with a load of 5 N / 3 cm. When the woven yarn in the direction intersecting with the torque yarn is a non-torque yarn, the woven yarn preferably has a heat shrinkage rate of 20% or less.

  In the present invention, the heat set after twisting may be dry heat using a false twisting apparatus and its hot plate, but is preferably performed at 110 to 135 ° C. with water vapor.

  In the present invention, twisting and untwisting may be performed in a plurality of stages. For example, the twisting in the S direction may be a mode in which twisting is performed on a double yarn. The twisting in the Z direction may be twisting in the direction of untwisting the twisted yarn. Alternatively, for example, the twisted single yarn or double yarn may be twisted in the Z direction after false twisting in the S direction using a false twisting apparatus and its hot plate.

  Examples of heat-resistant functional fibers used in the present invention include meta-aramid fibers such as Nomex (trade name), Conex (trade name), and Appier (trade name), Kevlar (trade name), Technora (trade name), and the like. Examples include para-aramid fibers, wholly aromatic polyester fibers such as Vectran (trade name), PEEK fibers, PPS fibers, polyimide fibers, fluorine fibers, and polyketone fibers. Among these, meta-aramid fibers are preferable because they have good heat setting properties due to water vapor and a high shrinkage rate due to hot water in the living machine.

  The material of the woven yarn in the direction intersecting with the torque yarn of the stretchable fabric of the present invention is preferably a heat-resistant functional fiber, but may be a normal fiber such as a polyester fiber. The woven yarn may be a filament.

  The stretchable fabric of the present invention can be used as a composite fabric having good heat resistance and stretchability by coating or impregnating synthetic rubber. This composite fabric also has excellent heat resistance, and the spun yarn of the stretch fabric is buried in a synthetic rubber coated or impregnated to act as an anchor. Even if it expands and contracts, the stretchable cloth and the synthetic rubber are difficult to peel off. In particular, when the above-described stretchable yarn is used for both warp and weft, it is suitably used for protective clothing and the like as a heat-resistant garment material having excellent curved surface forming ability. Moreover, it is suitably used as a canvas for a tent having good elasticity.

  The stretchable cloth of the present invention can be used as a transmission belt having good heat resistance and bendability or a conveyor belt by coating or impregnating synthetic rubber. Since the elastic cloth follows the deformation at the time of bending of the belt and expands and contracts, the belt can be easily bent and can withstand repeated bending. In addition, the spun yarn of the spun yarn constituting the elastic fabric is buried in the coated or impregnated synthetic rubber to act as an anchor, so that the elastic fabric and the synthetic rubber are not easily separated by repeated bending of the belt.

  The stretchable cloth of the present invention can be used as a bellows cloth having good heat resistance as a composite cloth coated or impregnated with synthetic rubber. The bellows cloth is used as an enclosure for a connecting part of a vehicle. The bellows cloth using the stretchable cloth of the present invention is such that when the composite cloth is bent at an acute angle and heated to fix the shape of the crease during the bellows processing, the stretchable cloth stretches and deforms following the folding. Extremely sharp bending can be performed.

  The stretchable cloth of the present invention is suitably used as a base cloth for a heat-resistant cloth-wound hose or a high-pressure hose for automobiles. The heat-resistant cloth-wound hose using the stretchable cloth of the present invention has good durability because the peripheral wall is deformed following the internal pressure of the fluid to be transported. Even if it is used, the hose inner tube and the base fabric are unlikely to cause poor adhesion, and the air tightness and liquid tightness due to this poor adhesion are unlikely to occur.

  The stretchable cloth of the present invention can be used as a reinforcing material for concrete for the purpose of reinforcement such as earthquake resistance of railways, roads, viaducts, and various buildings. In particular, it can be suitably used as a reinforcing cloth that is laid to follow a complicated curved surface by utilizing stretchability.

  The stretchable fabric of the present invention can be used as a base fabric for a heat-resistant composite material made of a resin reinforced with a woven fabric called a composite material. In particular, it is suitable for use as a base fabric for members of complex shapes that require an optimal arrangement of fiber directions in accordance with the shape, making use of stretchability and the anchoring effect of the flare to follow the complex shape. . This composite material is applied to airplanes, ships, casings for electronic devices, sports equipment, and the like.

Examples 1-10
Spun yarn (20S, 2.2dTex51mm used, Z twist) used by Conex (trade name) is used as the single yarn before drawing, and two of these are drawn and S direction twisted → Heat set by steam setter (120 (° C. × 30 minutes) → over-twisting was performed to obtain a spring yarn (S torque yarn). Further, Z direction twisting → heat setting with a steam setter (120 ° C. × 30 minutes) → over untwisting was performed to obtain a spring yarn (Z torque yarn). A double twister was used for twisting and overtwisting. The obtained yarn was used as a weft and was woven with a rapier loom using a commercially available polyester fiber 20 / 2S twine for warp to obtain a woven fabric. The obtained woven fabric was freely shrunk in hot water at 90 ° C. for 5 minutes to obtain a toothed belt cover fabric.

  In Examples 1, 2, 5, 6, 8, 9, and 10, S torque yarns and Z torque yarns were alternately driven one by one. In Examples 3, 4, and 7, S torque yarn and Z torque yarn were alternately driven in two cycles.

  In Table 1, the S direction twist number of the S torque yarn of Examples 1 to 10, the set condition, the Z direction twist number (over untwisted twist number), the Z direction twist number of the Z torque yarn, the set condition, S The directional twist number (over untwisted twist number), the weave structure, the on-machine set weave density, and the through-width are shown.

Comparative Examples 1-3
The single yarn similar to that in Examples 1 to 9 is used as the single yarn before being aligned, and two of these are aligned and subjected to S-direction twisting → heat setting with a steam setter → over untwisting, and spring yarn (S torque yarn) Was obtained using the same twister as in Examples 1-9. Using the obtained yarn as the weft, weaving was performed using the same warp with the same weaving machine as in Examples 1 to 9, and freely shrinking in the same manner to obtain a cover fabric for a toothed belt.

  In Table 1, in Comparative Examples 1 to 3, the S direction twist number of the S torque yarn, the set condition, the Z direction twist number (over untwisted twist number), the Z direction twist number of the Z torque yarn, the set condition, S The directional twist number (over untwisted twist number), the weave structure, the on-machine set weave density, and the through-width are shown.

Table 2 shows the weaving density of the fabric (covered fabric for toothed belt) after free shrinking and hot water of Examples 1 to 10 and Comparative Examples 1 to 3, and the fabric width of the fabric after free shrinking of fresh water and hot water. The warp density in a state where a load of 5 N / 3 cm is applied in the weft direction of the woven fabric after free hot water shrinkage is shown. In Table 3, the shrinkage ratio of the fabric width after free shrinkage based on the threading width, the thickness of the fabric after free shrinkage (thickness under load 0.5 mN / cm ² ), the tensile strength in the width direction, and the width direction Cutting elongation (elongation based on a measured length of an initial load of 500 mN / 3 cm), elongation stress at 50%, 100%, 150% elongation, surface condition, and overall evaluation are shown. The surface condition is markedly uneven. ×, the surface is slightly uneven. Δ △, the surface is uneven. Things are written as ◎. Comprehensive evaluation is that the unevenness is remarkable or the fabric is warped or the elongation is insufficient and is not suitable as a cover fabric for a toothed belt ... ×, whether the unevenness is seen or the elongation is low Slightly usable as a cover fabric for toothed belts ... △, with little unevenness and sufficient elongation, and usable as a cover fabric for toothed belts ... ○, with almost no unevenness and sufficient elongation What is excellent as a cover fabric for toothed belts.

Example 11
In the same manner as in Example 9, an S torque yarn and a Z torque yarn were obtained. The obtained yarn was used as a warp, and the weft was woven with a rapier loom using the same yarn as used for the warp in Example 9 to obtain a woven fabric. The warp yarns were alternately arranged with S torque yarns and Z torque yarns one by one. The on-machine weaving density of the woven fabric was 38 warps / 25.4 mm and 12 wefts / 25.4 mm. The obtained woven fabric was freely shrunk in hot water at 90 ° C. for 5 minutes to obtain a toothed belt cover fabric. It took time to process the warp breakage during weaving, and weaving was not good. The properties of the toothed belt cover fabric were inferior to the toothed belt cover fabric of Example 9 in terms of surface condition and elongation.

Example 12
Cover fabric for toothed belt in the same manner as in Example 9 except that a commercial spun yarn (20S) using Kevlar (trade name) was used as the single yarn before alignment, and the twist set was performed at 200 ° C. with wet heat. Got. Although the elongation was smaller than that of the toothed belt cover fabric of Example 9, there was almost no unevenness and it was usable as a toothed belt cover fabric.

Example 13
A cover fabric for a toothed belt was obtained in the same manner as in Example 9, except that the spun yarn (20S) using PPS fibers was used as the single yarn before drawing. The elongation was slightly smaller than that of the toothed belt cover fabric of Example 9, but there was almost no unevenness and it was usable as a toothed belt cover fabric.

Example 14
A commercial spun yarn (20S, 2.2dTex 51mm used, Z twist) used by Conex (trade name) is used as a single yarn before alignment, and two of these are aligned and twisted in the S direction in the same manner as in Example 1. → Heat setting by steam setter → Over untwisting was performed to obtain a spring yarn (S torque yarn). Further, similarly to Example 1, twisting in the Z direction → heat setting with a steam setter (120 ° C. for 30 minutes) → over untwisting was performed to obtain a spring yarn (Z torque yarn). A double twister was used for twisting and overtwisting. The obtained yarn was woven using a rapier loom as a weft and a warp to obtain a woven fabric. For each of the weft and the warp, S torque yarn and Z torque yarn were alternately arranged one by one. The on-machine set weave density was 12 × 37 (pieces / 25.4 mm). A stretchable fabric that stretches and contracts freshly was obtained by immersing the raw machine in hot water at 95 ° C. to shrink it.

This stretchable fabric was fixed in a stretched state of 50% and neoprene rubber was coated by a conventional method to obtain a canvas for a tent having a good stretchability (weight per unit: 250 g / m ² ).

Comparative Example 4
A polyester wooly yarn (84dTex / 1) was used as the weft, and weaving was performed using the same warp with the same weaving machine as in Examples 1 to 9, followed by free shrinking in the same manner to obtain a toothed belt cover fabric. The weaving structure is plain weaving, the on-machine weaving density is 12 x 74 (lines / 25.4mm), the threading width is 112cm, the warp density of the fabric after free shrinkage is 28 yarns / 25.4mm, the fabric after free shrinkage The width is 56.5 cm, the shrinkage rate based on the through-thickness width is 49.5%, the thickness of the fabric after free shrinkage is 0.85 mm, the tensile strength is 220 N / 3 cm, and the cut elongation is 178.1%. there were. The surface state of the obtained cover fabric for toothed belt was ○, but the thickness and strength of the fabric were slightly insufficient. Further, the weft was insufficient in heat resistance as a cover fabric for a toothed belt.

Comparative Example 5
A cover fabric for a toothed belt was obtained in the same manner as in Comparative Example 4 except that the woven structure was changed to 2/2 twill. The warp density after free shrinkage is 32.5 / 25.4 mm, the fabric width after free shrinkage is 48.5, the shrinkage rate based on the through-thickness width is 56.7%, and the fabric after free shrinkage The thickness was 1.00 mm, the tensile strength was 229 N / 3 cm, and the cut elongation was 194.1%. The surface state of the obtained cover fabric for toothed belt was ○, but the thickness and strength of the fabric were slightly insufficient. Further, the weft was insufficient in heat resistance as a cover fabric for a toothed belt.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (6)

A base fabric used for a heat-resistant composite member, wherein a plurality of span yarns made of heat-resistant functional fibers are combined, twisted in a direction opposite to the original twist direction of the span yarn, and then heat-set, and then the original twist direction A plurality of span yarns made of heat-resistant functional fibers and a plurality of spun yarns that are over-twisted to each other, heat set in the original twist direction of the span yarn, and then heat set, and in the direction opposite to the original twist direction An elastic fabric comprising a woven fabric in which other untwisted yarns are alternately arranged every one or two woven yarns in at least one direction selected from warps and wefts. The one yarn has a twist coefficient in the direction opposite to the original twist direction of the spun yarn of 12 to 16, the twist coefficient of the remaining twist is 2.5 to 3.5, The stretchable fabric according to claim 1, wherein the spun coefficient of the spun yarn in the original twist direction is 9 to 13, and the twist coefficient of the remaining twist is 2.4 to 4.0. The cover factor of the one-way yarn is 11.4 to 13.6, and the fabric of the yarn in the direction crossing the one-way yarn is stretched in the direction of the one-way yarn with a load of 5 N / 3 cm. The stretchable cloth according to claim 1 or 2, wherein a cover factor in a state is 3.0 to 5.5. The stretchable fabric according to any one of claims 1 to 3, wherein an elongation stress at 100% elongation along the direction of the one-way yarn is 3 N / 3 cm or less. The stretchable fabric according to any one of claims 1 to 4, wherein the heat-resistant functional fiber is a meta-aramid fiber, and the heat set is by steam heating. A cover fabric for a toothed belt, comprising the stretchable fabric according to any one of claims 1 to 5, wherein the one yarn and the other yarn are used as a unidirectional yarn selected from warp and weft. .