JP2009084725A - Reinforcing fiber cord for transmission belt and transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing fiber cord for a transmission belt, which has especially excellent transmission performance and belt traveling life, and to provide a transmission belt reinforced with the cord. <P>SOLUTION: The reinforcing fiber cord for a transmission belt has a spun yarn of a fiber having 95 mol% or more of a repeating units, composed of a polyketone represented by formula (1) and has an average fiber length of the spun yarn of 300-2,000 mm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcing fiber cord for a transmission belt and a transmission belt reinforced with the fiber cord, and more particularly, a transmission fiber reinforcing fiber cord excellent in transmission performance and belt running life, and a transmission belt reinforced with the fiber cord. About.

  The present applicant has previously proposed a spun yarn of a fiber composed of polyketone (hereinafter referred to as “polyketone fiber”) in Patent Document 1, and has high strength, excellent appearance and texture, It is a spun yarn excellent in processability such as process passability, and a check spun yarn having an average fiber length of 10 to 200 mm is disclosed as an example. The spun yarn is useful as a rubber reinforcing material such as a transmission belt, but no particular study has been made on improvement of the transmission performance of the transmission belt and the belt running life.

Japanese Patent Laid-Open No. 2003-082542

  An object of the present invention is to provide a reinforcing fiber cord for a transmission belt that is particularly excellent in transmission performance and belt running life, and a transmission belt reinforced with the cord.

（２）紡績糸が、牽切紡績糸であることを特徴とする上記（１）記載の伝動ベルト用補強繊維コード。
（３）上記（１）又は（２）記載の伝動ベルト用補強繊維コードで補強されたことを特徴とする伝動ベルト。 The inventor of the present invention has reached the present invention as a result of intensive studies to solve the above-mentioned problems.
That is, the present invention is as follows.
(1) Reinforcement fiber cord for transmission belt composed of spun yarn of fiber composed of polyketone represented by the following formula (1) with 95 mol% or more of the repeating unit, wherein the average fiber length of the spun yarn is A reinforcing fiber cord for a transmission belt, which is 300 to 2000 mm.

(2) The reinforcing fiber cord for a transmission belt according to (1), wherein the spun yarn is a check spun yarn.
(3) A transmission belt reinforced with the reinforcing fiber cord for a transmission belt according to the above (1) or (2).

  According to the present invention, a reinforcing fiber cord for a transmission belt and a transmission belt reinforced with the cord, which are particularly excellent in transmission performance and belt running life, are provided.

但し、Ｒは、エチレン以外の炭素数１〜３０の有機基であり、例えば、プロピレン、ブチレン、１−フェニルエチレン等の基であり、Ｒの水素原子の一部または全部が、ハロゲン基、エステル基、アミド基、水酸基、エーテル基で置換されていてもよい。もちろん、Ｒは二種以上であってもよく、例えば、プロピレン基と１−フェニルエチレン基が混在していてもよい。 The present invention will be specifically described below.
In the polyketone constituting the polyketone fiber of the present invention, 95 mol% or more, preferably 98 mol% or more, particularly 99.6 mol% or more of the repeating unit is represented by the above formula (1). The polyketone may contain a repeating unit other than the above formula (1), for example, one represented by the following formula (2) within a range of less than 5 mol%.

Where R is an organic group having 1 to 30 carbon atoms other than ethylene, for example, a group such as propylene, butylene, 1-phenylethylene, etc., and a part or all of the hydrogen atoms of R are halogen groups, esters It may be substituted with a group, an amide group, a hydroxyl group or an ether group. Of course, R may be two or more, for example, a propylene group and a 1-phenylethylene group may be mixed.

式中のｔ及びＴは、それぞれヘキサフルオロイソプロパノール（セントラル硝子（株）社製）及び該ヘキサフルオロイソプロパノールに溶解したポリケトンの希釈溶液の２５℃での粘度管の流過時間である。Ｃは、上記希釈溶液の濃度であり、ヘキサフルオロイソプロパノール１００ｍｌ中のポリケトンの質量（ｇ）である。 The intrinsic viscosity [η] of the polyketone is preferably 1 dl / g or more, more preferably 2 dl / g or more, particularly preferably 4 dl / g or more, preferably 20 dl / g or less, more preferably 15 dl / g or less, particularly Preferably it is 10 dl / g or less.
The intrinsic viscosity [η] is a value obtained based on the following definition formula.

In the formula, t and T are the flow times of the viscosity tube at 25 ° C. of hexafluoroisopropanol (manufactured by Central Glass Co., Ltd.) and a dilute solution of polyketone dissolved in the hexafluoroisopropanol, respectively. C is the concentration of the diluted solution, and is the mass (g) of polyketone in 100 ml of hexafluoroisopropanol.

The polyketone may contain additives such as antioxidants, radical inhibitors, other polymers, matting agents, ultraviolet absorbers, flame retardants, and metal soaps as necessary.
The shape of the polyketone fiber may be uniform or thick in the length direction, and the cross-sectional shape of the fiber may be round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, Yaba-shaped, flat (It has a flatness of about 1.3 to 4, including W type, I type, boomerang type, wave type, skewer type, eyebrows type, rectangular parallelepiped type, etc.), polygonal type such as dogbone type, many It may be a leaf type, a hollow type, or an irregular shape.

Next, as preferable characteristics of the polyketone fiber, the tensile strength is 5 cN / dtex or more, more preferably 10 cN / dtex or more, particularly preferably 15 cN / dtex or more, 30 cN / dtex or less, and the tensile elongation is 3%. Or more, more preferably 3.5% or more, particularly preferably 4% or more, 15% or less, more preferably 10% or less, still more preferably 8% or less, and particularly preferably 6% or less. Is 100 cN / dtex or more, more preferably 200 cN / dtex or more, particularly preferably 300 cN / dtex or more, and 1000 cN / dtex or less.
The preferred single yarn fineness of the polyketone fiber is in the range of 0.01 to 10 dtex, more preferably 0.1 to 3 dtex, and particularly preferably 0.5 to 3 dtex.

The present invention is a reinforcing fiber cord for a transmission belt using a spun yarn of such polyketone fiber, it is necessary that the average fiber length of the spun yarn is 300 to 2000 mm, preferably 350 mm or more, more preferably 400 mm or more, 450 mm or more is particularly preferable, and 1700 mm or less, 1500 mm or less, and particularly 1200 mm or less is preferable. If the average fiber length is less than 300 mm and more than 2000 mm, the object of the present invention is not achieved.
In the present invention, as the spun yarn, a check spun yarn is preferable, and when the average fiber length is L, it is preferable that short fibers having a length of 1.5 L or more have a ratio of 10 to 25%. The short fibers having a length of 1.5 L or more are 12% or more, particularly 15% or more, and preferably have a ratio of 23% or less, particularly 20% or less.
Here, the average fiber length L is a value obtained by dividing the number obtained by multiplying the fiber length and the number of fibers in the staple diagram by the total number of fibers, and 10 to 25% of short fibers having a length of 1.5 L or more. Having in proportion means that a value obtained by dividing the number of short fibers having a length of 1.5 L or more by the total number of fibers is 10 to 25%.

If the ratio of short fibers having a length of 1.5 L or more is less than 10%, the strength may be insufficient, and if it exceeds 25%, the transmission performance may be deteriorated.
Furthermore, it is preferable that the short fibers having a length of 0.5 L or less are 10% or more, particularly 15% or more, and preferably have a ratio of 25% or less, particularly 20% or less. If it exceeds 25%, it may be difficult to obtain high strength.
The total fineness of the spun yarn is preferably 30 to 1100 dtex, particularly preferably 55 to 800 dtex.
Further, the spun yarn may be used after being additionally twisted, and the twisting coefficient (K) of the additional twist may be selected within the range of 1000 to 10,000. In addition, it may be used in a conventional manner, for example, by twisting and then twisting to form a twin yarn or triplet, or by combining two or more spun yarns and then conjugating them using a swivel conjugation nozzle. A combination of can also be used. The twist coefficient (K) is a value represented by the following formula.
Twisting coefficient (K) = number of twists × total fineness of spun yarn (dtex) ^1/2

The spun yarn used in the present invention includes composite spun yarn such as silospan, silofil, and core yarn in addition to the spun yarn after fine spinning, and particularly a core-sheath structured yarn (sheath sheath) in which a polyketone fiber is disposed in the core. The part is preferably exemplified as the following mixed fiber.)
The spun yarn used in the present invention may be 100% polyketone fiber, but if necessary, it is preferably in the range of 50% by mass or less, other than polyketone fiber, for example, natural fibers such as cotton and wool, rayon. Cellulose fibers such as fibers, lyocell fibers, polyester fibers, polyamide fibers, aramid fibers (para and meta), polyvinyl alcohol fibers, wholly aromatic polyester fibers, poly (p-phenylenebenzobisoxazole) fibers, ultrahigh molecular weight polyolefins Various known fibers (long fibers or short fibers, which may be used in combination) such as fiber, carbon fiber, ceramic fiber, glass fiber, metal fiber, and the like may be mixed by twisting, mixing, etc. .

As a preferred method for producing the spun yarn used in the present invention, the one illustrated in FIG. 1 can be mentioned. While the polyketone fiber tow or multifilament A is drawn and overlapped in front of the supply nip roller 1, the supply nip is arranged. After passing through the roller 1, it is simultaneously torn in the shooter 2 by the check nip roller 3, and uniformly checked while being drafted to obtain a short fiber bundle. Next, after being torn off from the check-off nip roller 3 by the suction air nozzle 4, and further provided with a binding portion by winding the fluff of short fibers together with the swirling conjugating nozzle 5 and then by the delivery roller 6 It is taken up and becomes a yarn 7 in which the fluffs of short fibers are randomly wound.
Further, two series of steps illustrated in FIG. 1 are provided, and each of the swirling conjugation nozzles 5 is provided with a binding portion by wrapping the fluff of short fibers together with the entanglement, and then combining the two. It may be picked up by the delivery roller 6 after being conjugated by a swivel conjugated nozzle (not shown).

The spun yarn thus obtained is made into a twin yarn or triplet by a conventional method, for example, a lower twist and then an upper twist, or two or more spun yarns are combined, and then a swivel conjugated nozzle And may be used in combination.
Further, the short fiber bundle obtained by checking may be used as a spun yarn through a general drawing, roving, and spinning process according to a conventional method. Especially, the ring spun yarn has a softer texture. This is preferable.
Further, when checking, a conventional perlock type or turbo type may be used.
In the present invention, examples of a method of setting the ratio of short fibers having a length of 1.5 L or more to 10 to 25% include, for example, a method of setting a draft at the time of checking low, a supply nip roller 1 and a checking nip roller 3 is a method of providing a regular polygonal middle roller between the three.
This method is also suitable as a method for adjusting the ratio of short fibers having a length of 0.5 L or less to 10 to 25%.

The reinforcing fiber cord for a transmission belt of the present invention is made of spun yarn of such polyketone fiber, but when used as a reinforcing fiber cord for a transmission belt, it may be RFL-treated.
RFL treatment refers to treatment with a mixed solution containing resorcin, formalin and latex, and the preferred adhesion amount of the RFL resin is in the range of 1 to 10 mass%, particularly 2 to 7 mass% with respect to the fibers.
A preferred molar ratio (F / R) of formalin (F) to resorcin (R) is 1.0 to 2.2, particularly preferably 1.0 to 1.9, and resorcin to the solid content mass (L) of the total latex. And the ratio (RF / L) of the formalin total mass (RF) is preferably 5 to 25% by mass, particularly preferably 5 to 17% by mass, and the molar ratio of the total amount of sodium hydroxide and ammonium hydroxide to resorcin (R) (NaOH + NH ₄ OH / R) is preferably 0.21 or less.

The latex is preferably a latex corresponding to the rubber composition used for the transmission belt. For example, styrene-butadiene-vinylpyridine terpolymer, chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM). ), Hydrogenated acrylonitrile rubber (HNBR), epichlorohydrin, natural rubber, styrene-butadiene rubber (SBR), chloroprene rubber, olefin-vinyl ester copolymer, ethylene-propylene-diene rubber (EPDM) and the like. .
Prior to the RFL treatment, pretreatment with an epoxy or isocyanate compound may be performed.
As a method of RFL treatment, it may be applied to a spun yarn of polyketone fiber, or it is treated with RFL treatment in a state where a long fiber of polyketone fiber is twisted as necessary, and then cut to obtain a short fiber for spinning. It can be used as a thread. The twist number is preferably 100 to 700 in terms of the twist coefficient (K1) represented by the following formula, but may be about 30000.
T1 = K1 / D ^1/2
T1 = Number of twists (T / m), D = Fine fineness (dtex) of the yarn supplied for RFL
Further, after forming a reinforcing fiber cord for a transmission belt or a reinforcing cloth for the transmission belt, RFL treatment may be performed.

The present invention uses such spun yarn as a reinforcing fiber cord for a transmission belt, and is woven into a plain weave, twill weave, satin weaving, etc. using this reinforcing fiber cord and used as a reinforcing cloth for a transmission belt. The object of the invention is achieved. Further, the reinforcing fabric may be a wide angle in which the intersection angle between the warp and the weft is about 90 to 120 °.
The reinforcing fabric is preferably composed of 100% reinforcing fiber cord for transmission belt according to the present invention, but if necessary, other reinforcing fiber cords (in the above-described spun yarn of the present invention) within a range of 50% by mass or less. For example, it may be used for either warp or weft, or may be used alternately for one or several warps and / or wefts.

In the present invention, a V belt, a flat belt, and a toothed belt are preferable as the transmission belt, and a V-ribbed belt, a low-edge type V belt, and a wrapped type V belt are preferable. Further, a friction transmission belt having a compressed rubber layer may be used, and the friction transmission belt may have an adhesive rubber layer. For example, it is composed of a compressed rubber layer, an adhesive rubber layer in contact with the compressed rubber layer, and a rubber-attached canvas in contact with the adhesive rubber layer (reinforced fabric is subjected to RFL treatment, and a rubber composition is friction-coated). Examples include a core wire embedded in the adhesive rubber layer along the longitudinal direction of the belt.
The low-edge type V-belt is provided with an adhesive rubber layer in which a core wire is embedded, a compression rubber layer below it, and an extension rubber layer above it. The bottom surface of the compression rubber layer and / or the surface of the extension rubber layer Are laminated with rubberized canvas (1-6 plies).

  Here, the rubber composition for forming the compressed rubber layer and the rubber composition for forming the adhesive rubber layer may be the same, or the compression rubber layer and / or the adhesive rubber layer may be polyketone. Short fibers may be included, and if the calendering direction is the belt length direction or the belt width direction, the content of polyketone short fibers per 100 parts by mass of rubber is appropriately selected. Preferably, however, the preferred content of the polyketone short fiber in the rubber composition is in the range of 3 to 50 parts by weight, more preferably 5 to 40 parts by weight, especially 5 to 30 parts by weight per 100 parts by weight of the rubber. .

The fiber length of the polyketone short fiber is preferably 0.5 to 10 mm, preferably 1 mm or more, more preferably 1.5 mm or more, particularly preferably 2 mm or more, 9 mm or less, more preferably 8 mm or less, particularly preferably 7 mm or less. The ratio L / D of the preferred fiber length L to the fiber diameter D is 30 or more, more preferably 50 or more, particularly 100 or more, and 1670 or less, more preferably 1500 or less, and particularly preferably 1000 or less. The preferred single yarn fineness is in the range of 0.01 to 10 dtex, more preferably 0.1 to 10 dtex, and particularly preferably 0.5 to 5 dtex.
Further, as the core wire, for example, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon 6, 66, etc.), polyvinyl alcohol, aramid core wire, polyketone core wire (for example, polyketone fiber multifilament yarn or monofilament yarn) In addition, the reinforcing fiber cord for a transmission belt of the present invention can be used.

  Examples of the rubber composition include chloroprene rubber, natural rubber, nitrile rubber, styrene / butadiene rubber, butadiene rubber, ethylene / propylene rubber, chlorosulfonated polyethylene rubber (CSM), alkylated chlorosulfonated polyethylene rubber (ACSM), Compositions mainly composed of acrylic rubber, urethane rubber, hydrogenated acrylonitrile rubber (HNBR), ethylene-α-olefin elastomer, such as ethylene-propylene-diene rubber (EPDM), ethylene-propylene copolymer (EPM), ethylene-butene Examples thereof include a copolymer (EBM), an ethylene-octene copolymer (EOM), a halogen substitution thereof (particularly a chlorine substitution), a mixture of two or more thereof. The composition mainly composed of an ethylene-α-olefin elastomer may contain a hydrogenated acrylonitrile rubber (HNBR), and if necessary, an enhancer such as carbon black or silica, or a filler such as calcium carbonate or talc. , Plasticizers, stabilizers, processing aids, colorants and the like.

  The transmission belt of the present invention can be manufactured by a conventionally known production method. For example, in the case of a V-ribbed belt, a rubber-coated canvas and a rubber composition unvulcanized sheet for an adhesive rubber layer are formed on the peripheral surface of a molding drum. Winding, spinning the core wire on it, and further winding the rubber composition unvulcanized sheet for the adhesive rubber layer on it, and then winding the rubber composition unvulcanized sheet for the compressed rubber layer To make a laminate. Next, the annular product obtained by vulcanizing this laminate may be formed with ribs on the surface with a cutting grindstone and cut into a predetermined width.

  In addition, for example, for the purpose of suppressing a decrease in the tensile strength of the polyketone fiber by receiving strong ultraviolet rays outdoors, an ultraviolet absorber (for example, a benzophenone series, a benzotriazole series, a hindered amine series in the form of fibers or spun yarns or fabrics). And / or UV screening agents (for example, fine particles such as titanium oxide, iron oxide, cerium oxide, etc., preferably having an average particle size of 0.01 to 0.6 μm). It is preferable to contain. Examples of the method of inclusion include, for example, a method of applying or coating a resin or a film containing an ultraviolet absorber and / or an ultraviolet shielding agent to a fiber, a spun yarn, or a fabric, and the inclusion of the ultraviolet absorber and / or the ultraviolet shielding agent. The amount is preferably 0.001 to 10% by mass relative to the mass of the resin or film.

The present invention will be described more specifically based on examples, but the present invention is not limited to these examples.
The measurement method and evaluation method in the present invention are as follows.
(1) Tensile strength, tensile elongation, and tensile modulus of fiber Measured according to JIS-L-1013.
Sample length: 20 cm, tensile speed: measured at 20 cm / min, and an average value is obtained when measured 20 times.
(2) Tensile strength of spun yarn The yarn twisted with the twist coefficient 5450 is measured.
Twist factor (K) = twist number × total fineness of spun yarn (dtex) ^1/2

(3) Transmission performance test A low-edge belt is stretched over a three-axis pulley consisting of a driving pulley having a diameter of φ125 mm, a driven pulley having a diameter of φ125 mm, and a tension pulley having a diameter of φ70 mm, and the rotational speed of the driving pulley is 4700 rpm at room temperature. The belt slip ratio G after 24 hours was measured by running at 10 PS under a load of 68 kgf. The belt slip ratio G was calculated by the following formula.
G = (I _24- I ₀ ) / I ₀ × 100
I ₀ = Na ₀ / Nb ₀
I ₂₄ = Na ₂₄ / Nb ₂₄
Na ₀ : Number of revolutions of the drive pulley at the start of the test (rpm)
Nb ₀ : number of revolutions of the driven pulley at the start of the test (rpm)
Na ₂₄ : Number of revolutions of the drive pulley after 24 hours (rpm)
Nb ₂₄ : Rotation speed of driven pulley after 24 hours (rpm)

(4) Belt running life test A low-edge cog belt is stretched between a driving pulley having a diameter of φ115 mm and a driven pulley having a diameter of φ100 mm, and a tension pulley having a diameter of φ50 mm is pressed against the belt rear surface at an angle of 160 ° with a load of 10 kgf. The belt was run at 80 ° C. with a rotational speed of the drive pulley of 3800 rpm and a load of 5 PS, and the time until a crack occurred in the belt cog was measured.
(5) Production of belt Weaving a plain woven fabric using the spun yarn obtained in the examples for warp and weft (warp density and weft density 70 / 2.54 cm), and after treatment with the following RFL liquid, Friction coating is performed using the friction rubber composition and the coating rubber composition to obtain a rubberized canvas. A low-edge cog belt (upper width 22.5 mm, thickness 10 mm, length 845 mm, cog part depth 5 mm, cog part pitch 10.7 mm) and low-edge belt (upper part) using a compressed rubber layer made of the following rubber composition Width 8.7 mm, thickness 6.3 mm, length 835 mm).

<Production of low edge cog belt>
A cog pad having a cog shape composed of a canvas with rubber (1 ply) obtained above and a compressed rubber layer is fitted into a mold having a cog shape, and then a core wire (polyisocyanate compound and then an RFL-treated polyethylene terephthalate fiber ), A stretch rubber layer, and a cover canvas (3-ply cotton canvas with rubber) are wound in order, and vulcanized to obtain a belt sleeve. This sleeve was cut into a V shape by a cutter to finish a low edge cog belt.
<Production of low edge belt>
Molded rubber canvas (3-ply), compressed rubber layer, core wire (polyisocyanate compound, then RFL-treated polyethylene terephthalate fiber), stretch rubber layer, cover canvas (3-ply rubberized cotton canvas) ) Are sequentially wound and vulcanized to obtain a belt sleeve. This sleeve was cut into a V shape by a cutter to finish a low edge belt.

<RFL solution>
Chloroprene rubber latex 100 parts by weight Resorcinol 14.6 parts by weight Formalin 9.2 parts by weight Caustic soda 1.5 parts by weight Water 262.5 parts by weight <Friction rubber composition>
Chloroprene rubber 100 parts by mass Carbon 50 parts by mass Naphthenic oil 20 parts by mass Chroman oil 5 parts by mass Black sub 5 parts by mass Stearic acid 1 part by mass Magnesium oxide 4 parts by mass Anti-aging agent 2 parts by mass Zinc oxide 5 parts by mass <Coating rubber composition Things>
Chloroprene rubber 100 parts by mass Carbon 40 parts by mass Naphthenic oil 5 parts by mass Stearic acid 1 part by mass Magnesium oxide 4 parts by mass Anti-aging agent 2 parts by mass Zinc oxide 5 parts by mass <Rubber composition of compressed rubber layer>
Chloroprene rubber 100 parts by weight Carbon 40 parts by weight Nylon short fiber 15 parts by weight Naphthenic oil 5 parts by weight Stearic acid 1 part by weight Magnesium oxide 4 parts by weight Anti-aging agent 2 parts by weight Zinc oxide 5 parts by weight Accelerator 0.5 part by weight

[Example 1]
Using the apparatus shown in FIG. 1, a polyketone fiber multifilament yarn of 1670 dtex / 1250f (manufactured by Asahi Kasei Fibers Co., Ltd .; trademark Cyvalon; tensile strength 18 cN / dtex, tensile elongation 5%, tensile elastic modulus 350 cN / dtex) The short fiber bundle torn at a speed of 300 m / min between the supply nip roller 1, the shooter 2 and the check nip roller 3 (check length 120 cm) at a speed of about 5.7 times (draft during check). Subsequently, the yarn was passed through the suction air nozzle 4 and the swirl conjugated nozzle 5 to obtain a spun yarn of 295 dtex provided with a binding portion by winding the fluff of short fibers together with the entanglement.
The obtained spun yarn had a strength of 13.6 cN / dtex, an average fiber length (L) of 450 mm, a ratio of 1.5 L or more and 0.5 L or less of 16 to 18%.
Using the obtained spun yarn, the above transmission performance test and belt running life test were conducted, and the results were excellent with a belt slip ratio of 0.55% and a belt running life of 160 hours.

[Examples 2-4, Comparative Examples 1-2]
In Example 1, the check fiber length was changed to obtain a short fiber bundle having a changed average fiber length (L), and a reinforcing fiber cord was obtained in the same manner as in Example 1 using the obtained short fiber bundle. . As a result of the above transmission performance test and belt running life test of the transmission belt using the reinforcing fiber cord, the average fiber length (L) is 300 mm (Example 2), the spun yarn strength is 13.6 cN / dtex, A belt slip rate of 0.53%, a belt running life of 150 hours, an average fiber length (L) of 1200 mm (Example 3), spun yarn strength of 13.8 cN / dtex, belt slip rate of 0.57%, belt running When the life was 165 hours and the average fiber length (L) was 2000 mm (Example 4), the spun yarn strength was 13.8 cN / dtex, the belt slip ratio was 0.65%, and the belt running life was 170 hours. .
When the average fiber length (L) is 250 mm (Comparative Example 1), the spun yarn strength is 13.4 cN / dtex, the belt slip ratio is 0.53%, the belt running life is 100 hours, and the belt running life is inferior to the examples. It was. In addition, when the average fiber length (L) is 2200 mm (Comparative Example 2), the spun yarn strength is 13.8 cN / dtex, the belt slip ratio is 0.85%, the belt running life is 170 hours, and the belt slip ratio is the same as in the example. In contrast, it was inferior.

[Example 5]
The strength of the ring spun yarn obtained by ring-spinning the short fiber bundle obtained in Example 1 according to a conventional method was 13.5 cN / dtex. A reinforcing fiber cord was obtained in the same manner as in Example 1 using the obtained spun yarn. The results of the transmission performance test and belt running life test of the transmission belt using the reinforcing cord were as excellent as in Example 1 with a belt slip ratio of 0.55% and a belt running life of 165 hours.

  The present invention provides a reinforcing fiber cord for a transmission belt that is particularly excellent in transmission performance and belt running life, and a transmission belt reinforced with the cord.

It is a side view which shows an example of the method of manufacturing the spun yarn of this invention.

Explanation of symbols

A: Tow or multifilament 1: Supply nip roller 2: Shooter 3: Checking nip roller 4: Suction air nozzle 5: Swivel conjugation nozzle 6: Delivery roller 7: Yarn

Claims (3)

95% by mole or more of the repeating unit is a reinforcing fiber cord for a transmission belt composed of a spun yarn of a fiber composed of a polyketone represented by the following formula (1), and the average fiber length of the spun yarn is 300 to 2000 mm A reinforcing fiber cord for a transmission belt, characterized by being

  The reinforcing fiber cord for a transmission belt according to claim 1, wherein the spun yarn is a check spun yarn.   A transmission belt reinforced with the reinforcing fiber cord for a transmission belt according to claim 1 or 2.

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