JP2009102766A - Reinforcing fiber cord for transmission belt core wire, and transmission belt reinforced with the cord - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing fiber cord for a transmission belt core wire, which especially has improved fray resistance, and to provide a transmission belt reinforced with the cord. <P>SOLUTION: The reinforcing fiber cord for the transmission belt core wire is constituted of a spun yarn of a fiber having 95 mol% or more of a repeating unit formed of a polyketone represented by formula (1), and having an average fiber length of 300-2,000 mm. The spun yarn is preferably a stretch-broken spun yarn. The spun yarn is also preferably a yarn having a core-sheath structure which is obtained by arranging a polyketone fiber at the core part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a reinforcing fiber cord for a transmission belt core wire and a transmission belt reinforced with the cord, and more particularly to a reinforcing fiber cord for a transmission belt core wire with improved hot properties and a transmission belt reinforced with the cord.

  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. As a use of this spun yarn, it is useful for rubber reinforcements such as transmission belts. However, the transmission belt core wire is particularly flaky, that is, in the transmission belt with both belt sides exposed, the reinforcing fiber cord used for the core wire When the cross section is exposed on the side surface, no improvement has been studied on how easily the fibers constituting the cord are frayed.

Japanese Patent Laid-Open No. 2003-082542

  It is an object of the present invention to provide a reinforcing fiber cord for a transmission belt core wire that is particularly improved in the fraying property 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）記載の伝動ベルト心線用補強繊維コード。
（３）上記（１）又は（２）記載の伝動ベルト心線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) A reinforcing fiber cord for a transmission belt core wire, in which 95 mol% or more of the repeating units are composed of a spun yarn of a fiber composed of a polyketone represented by the following formula (1), and the average fiber of the spun yarn A reinforcing fiber cord for a transmission belt core wire, wherein the length is 300 to 2000 mm.

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

  According to the present invention, there are provided a reinforcing fiber cord for a transmission belt core wire particularly improved in the fraying property and a transmission belt reinforced with the cord.

但し式中、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%.

In the formula, 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. , An ester group, an amide group, a hydroxyl group, and an ether group may be substituted. 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。
ポリケトンには必要に応じて、酸化防止剤、ラジカル抑制剤、他のポリマー、艶消し剤、紫外線吸収剤、難燃剤、金属石鹸等の添加剤を含有させてもよい。
ポリケトン繊維の形態は、長さ方向に均一なものや太細のあるものでもよく、繊維の断面形状は、丸型、三角、Ｌ型、Ｔ型、Ｙ型、Ｗ型、八葉型、扁平（扁平度１．３〜４程度のもので、Ｗ型、Ｉ型、ブーメラン型、波型、串団子型、まゆ型、直方体型等がある。）、ドッグボーン型等の多角形型、多葉型、中空型や不定形なものでもよい。 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, 20 dl / g or less, more preferably 15 dl / g or less, particularly preferably. 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 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 core wire using a spun yarn of such polyketone fiber, it is necessary that the average fiber length of this spun yarn is 300 to 2000 mm, preferably 350 mm or more, The thickness is preferably 400 mm or more, particularly preferably 450 mm or more, preferably 1700 mm or less, more preferably 1500 mm or less, and particularly preferably 1200 mm or less. When the average fiber length is less than 300 mm, the strength of the reinforcing fiber cord is insufficient.
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 length of the short fiber having a length of 1.5 L or more is preferably 12% or more, particularly 15% or more and 23% or less, particularly preferably 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 hotness may be lowered (easily hot).
Furthermore, it is preferable that the short fibers having a length of 0.5 L or less have a ratio of 10% or more, particularly 15% or more and 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, more preferably 55 to 800 dtex.
The spun yarn may be used after additional twisting, and the twisting coefficient (K) of the additional twisting, the number of lower twists or the number of upper twists is preferably 1000 to 10,000, more preferably 1500 or more and 3000 or less. May be selected within a range of 2500 or less. What is necessary is just to select in the range of 1000-10000 as a twist coefficient (K) of additional twist. 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. Here, the twist coefficient (K) is a value obtained 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. . Further, it may be mixed with a polyamide or polyester low melting point fusion yarn having a melting point of, for example, 200 ° C. or less, preferably 120 to 160 ° C. by cross-twisting or the like, and may be heat treated. There is a method in which the number of yarns is aligned to form a core yarn, and a predetermined number of the outer periphery is covered with the spun yarn of the present invention, followed by heat treatment.

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, the swirl linking nozzle 5 is wound with the fluff of short fibers together with the entanglement to give the bundling portion, and then 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 And 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 the transmission belt core wire of the present invention is composed of spun yarn of such polyketone fiber, but when used as the reinforcing fiber cord for the transmission belt core wire, 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 vinyl pyridine terpolymer, chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM), Examples thereof include latexes such as hydrogenated acrylonitrile rubber (HNBR), epichlorohydrin, natural rubber, styrene butadiene rubber (SBR), chloroprene rubber, olefin vinyl ester copolymer, and ethylene propylene diene rubber (EPDM).
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
The core is preferably composed of 100% reinforcing fiber cord for transmission belt core wire of the present invention, but if necessary, other reinforcing fiber cords (spun fibers of the present invention as described above) may be added within a range of 50% by mass or less. Reinforcing fiber cords composed of fibers mixed with yarn) may be mixed, and for example, one to several may be alternately arranged and mixed.

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). Some adhesive rubber layers have core wires embedded 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 compression rubber layer and the rubber composition for forming the adhesive rubber layer may be the same, and the polyketone short may be used for the compression rubber layer and / or the adhesive rubber layer. The fibers may be contained, and the content of the polyketone short fibers per 100 parts by mass of rubber may be appropriately selected according to the case where the calendering direction is the length direction of the belt or the width direction of the belt. The preferable content of the polyketone short fiber in the rubber composition is preferably 3 to 50 parts by mass, more preferably 5 to 40 parts by mass, and particularly preferably 5 to 30 parts by mass per 100 parts by mass 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 2 mm or more, 9 mm or less, more preferably 8 mm or less, and particularly preferably 7 mm or less. The ratio L / D between the length L and 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 reinforcing fabric, for example, polyester fibers (polyethylene terephthalate, polyethylene naphthalate, etc.), polyamide fibers (nylon 6, 66, etc.), polyvinyl alcohol fibers, aramid fibers (para, meta), fully aromatic Group fiber, poly (p-phenylenebenzobisoxazole) fiber, ultra-high molecular weight polyolefin fiber, carbon fiber, ceramic fiber, glass fiber, metal fiber, polyketone fiber (which may be the reinforcing fiber cord of the present invention), etc. One or more filament yarns or monofilament yarns are used to weave into plain weave, twill weave, satin weave, etc., and the reinforcing fabric may have a wide angle where the crossing angle between warp and weft is about 90 to 120 °.

  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), A composition 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 copolymer (EBM), Examples thereof include ethylene octene copolymer (EOM), halogen substitution products thereof (especially chlorine substitution products), mixtures of two or more thereof. The composition mainly composed of ethylene α-olefin elastomer may contain a hydrogenated acrylonitrile rubber (HNBR), and if necessary, an enhancer such as carbon black and silica, a filler such as calcium carbonate and talc, a plastic Agents, stabilizers, processing aids, colorants and the like may be included.

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. Then, a ring obtained by vulcanizing this laminate may be formed with ribs on the surface with a cutting grindstone and cut into a predetermined width.
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 or the like in the form of fibers or spun yarns) And / or an ultraviolet shielding agent (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. As a method of containing, for example, there is a method of imparting or coating a resin or film containing an ultraviolet absorber and / or an ultraviolet shielding agent to a fiber or a spun yarn, and the content of the ultraviolet absorber and / or the ultraviolet shielding agent is 0.001 to 10% by mass is preferable based on 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) Cord strength of reinforcing fiber cord The treated cord was measured according to JIS-L-1017.
(4) Scratch property test A flat belt was cut into a width of 2 cm, and the degree of the cord that had been exposed on the cut surface was visually evaluated.
◎: No code fraying ○: Some code flaws are seen on the cut surface △: Cord flaws are seen on the cut surface ×: Code flaws are seen on the entire cut surface

(5) Production of flat belt After winding a rubber sheet (compressed rubber layer) of the rubber composition shown below around the circumferential surface of a cylindrical molding drum, the treatment cord obtained in the embodiment from above is spirally formed. Further, the same rubber sheet (extended rubber layer) was wound, vulcanized, and cut into a predetermined width to produce a flat belt.
<Rubber composition>
Hydrogenated nitrile rubber 100 parts by weight Zinc white 5 parts by weight Stearic acid 1 part by weight Anti-aging agent 2 parts by weight Carbon black 40 parts by weight Plasticizer 5 parts by weight Accelerator 3 parts by weight Sulfur 0.5 parts 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 is 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 3.3 times (draft during check). Subsequently, the yarn was passed through the suction air nozzle 4 and the swirl conjugated nozzle 5, and a spun yarn of 500 dtex with a binding portion was obtained by winding the fluff of short fibers together with the entanglement.
The obtained spun yarn had a strength of 13.7 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%.

Six spun yarns obtained were aligned and twisted (15.7 times / 10 cm), and heat-treated at 200 ° C. for 2 minutes with a tension of 10 N. Subsequently, after being immersed in the following RFL solution at a tension of 10 N for 3 seconds, drying at 100 ° C. for 1 minute and heat treatment at 200 ° C. for 2 minutes were performed to obtain a processed cord (code strength 13 cN / dtex).
The result of the above-described hotness test of the power transmission belt using the reinforcing fiber cord was as excellent as hotness.
<RFL solution>
H-NBR 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

[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-described fraying property test of the transmission belt using the reinforcing fiber cord, when the average fiber length (L) is 300 mm (Example 2), the spun yarn strength is 13.6 cN / dtex, and the cord strength is 13 cN / dtex. When the average fiber length (L) is 1200 mm (Example 3), the spun yarn strength is 13.8 cN / dtex, the cord strength is 13 cN / dtex, and the average fiber length is ◎. When (L) was 2000 mm (Example 4), the spun yarn strength was 13.8 cN / dtex, the cord strength was 13 cN / dtex, and the degree of hot cracking was excellent.
In the case where the average fiber length (L) is 250 mm (Comparative Example 1), the spun yarn strength is 13.4 cN / dtex, the cord strength is 11 cN / dtex, the degree of hotness is about 0 to Δ, and the cord strength and hotness are both in comparison with the Examples It was inferior. The fiber with an average fiber length (L) of 2200 mm (Comparative Example 2) is inferior to the Examples, with spun yarn strength of 13.8 cN / dtex, cord strength of 13 cN / dtex, and a degree of hotness Δ to ×. there were.

[Example 5]
The ring spun yarn obtained by ring-spinning the short fiber bundle obtained in Example 1 according to a conventional method had a strength of 13.5 cN / dtex. Using the obtained spun yarn, a reinforcing fiber cord was obtained in the same manner as in Example 1. As a result of the above-described hotness test of the transmission belt using the reinforcing fiber cord, It was excellent.

  In particular, the present invention provides a reinforcing fiber cord for a transmission belt core wire, which has improved fraying properties, 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 cord made 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 Reinforcing fiber cord for transmission belt core wire characterized by being -2000 mm.

  The reinforcing fiber cord for a transmission belt core wire 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 core wire according to claim 1 or 2.

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