JP4576287B2 - Method for supplying canvas, method for manufacturing canvas with blend, and method for manufacturing power transmission belt - Google Patents

Description

  The present invention relates to a method for supplying a canvas used for a power transmission belt or the like, a method for manufacturing a canvas with a blend, and a method for manufacturing a power transmission belt.

  Conventionally, it is known to use a canvas for a power transmission belt in order to improve transmission performance and durability. A canvas used for a power transmission belt is generally formed by being vulcanized and bonded to a belt body in a belt vulcanization molding process. The canvas is usually pre-topped with unvulcanized rubber before vulcanization so that it can be easily vulcanized and bonded to the belt body.

As a method for topping unvulcanized rubber, for example, as described in Patent Document 1 or Patent Document 2, a method of using a pair of calendar rolls is known. According to this method, the canvas is supplied between the pair of calendar rolls from the canvas supply roll, and the unvulcanized rubber is pressure-bonded between the pair of calendar rolls so that the unvulcanized rubber is topped.
JP 2003-127160 A JP-A-9-277400

  However, according to such a method, when the canvas is supplied to the calendar roll, tension is applied in the supply direction (that is, the longitudinal direction of the canvas). This tension action impairs the longitudinal stretch characteristics of the canvas. The power transmission belt in which the canvas having impaired elongation characteristics is used has a poor bending resistance, and its transmission performance and life are reduced.

  In addition, if the power transmission belt is a toothed belt, for example, the canvas is used as a tooth cloth. If the stretch characteristics are not sufficient, the canvas will not be molded along the tooth profile, and the moldability of the power transmission belt will deteriorate. Will be allowed to.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a method in which canvas is supplied without losing its elongation characteristics when supplied to a calendar roll, for example.

  The canvas supply method according to the present invention is a canvas supply method in which the canvas is supplied while tension is applied in the supply direction. In the canvas supply method, at least a part of the area where tension is applied on one surface of the canvas. A low stretchable member is bonded to the region, and the low stretchable member is characterized in that at least a part of the tension acts to reduce the tension acting on the canvas. According to this configuration, since the stretch of the canvas due to the tension is suppressed by adhering the low stretch member to the canvas, the canvas can be supplied while maintaining the stretch characteristics of the canvas.

  The low stretchable member is preferably a low stretchable strip-like sheet extending at least in the supply direction in the region where the tension is applied.

  Further, the low stretchable member is lower than the stretchability of the canvas in the supply direction. Further, for example, the low stretch member is a low stretch sheet that spreads over the entire surface. Thereby, most of the tension acting on the canvas acts on the low stretch sheet, so that the stretch characteristics of the canvas can be remarkably maintained. The low stretch sheet is preferably a low stretch fabric.

  In the canvas supply method of the present invention, for example, a canvas to which a low-stretch sheet is bonded is impregnated with a treatment agent, and then supplied from the first roll to the second roll while acting on the tension. Between the roll and the second roll, it is supplied to a drying device and dried.

  For example, the canvas is a stretchable fabric, and the stretchable fabric is stretchable in the supply direction, for example. The canvas is constituted by yarns extending in the supply direction and in a direction perpendicular to the supply direction, and the yarn extending in at least one direction is preferably a stretchable yarn. It is preferable that the yarn is a compressed yarn, and the elastic yarn is, for example, a nylon yarn. The stretchable yarn extends in the supply direction, for example.

  The method of manufacturing a canvas with a composition according to the present invention includes supplying a canvas while applying tension in a supply direction, attaching the composition to one surface of the canvas, or impregnating the composition, In the method for manufacturing a canvas with a composition to obtain a low-stretch member on the other surface of the canvas, a low-stretch member is bonded to at least a part of a region where tension is applied. At least a part of the material acts to reduce the tension acting on the canvas. According to such a configuration, since the stretch of the canvas due to the tension is suppressed by joining the low stretch member to the canvas, the composition can be attached to the canvas while maintaining the stretch characteristics of the canvas.

  The above-mentioned compound includes, for example, a predetermined drug, rubber paste, rubber, RFL, etc., and the adhesion of the compound to the canvas is, for example, spraying of the compound such as drug, topping of rubber, etc., coating of rubber, etc. The impregnation of the blend includes RFL treatment, rubber paste treatment and the like.

  For example, canvas is fed between two crimping rolls, and the compound is deposited between the crimping rolls. Here, the blend is, for example, unvulcanized rubber. In addition, for example, the canvas may be supplied into the RFL solution, the rubber paste solution, or the like while applying the tension in the supply direction.

  More specifically, in the production method of the present invention, preferably, a canvas with a sheet in which a low stretch sheet is bonded to the other surface of the canvas is supplied between, for example, two crimping rolls while acting tension in the supply direction. The compound is pressed against one surface of the canvas between these two crimping rolls. Here, the stretchability of the low stretch sheet is characterized by being lower than the stretchability of the canvas in the supply direction.

  In the production method of the present invention, preferably, the canvas with a sheet obtained by joining a low stretch belt-like sheet extending in the supply direction to the other surface of the canvas, for example, between two crimping rolls while acting tension in the supply direction. And the compound is pressed against one side of the canvas between these two crimping rolls. Here, the stretchability of the low stretchable strip sheet is characterized by being lower than the stretchability of the canvas in the supply direction.

  Moreover, it is preferable that the canvas is wound around a canvas supply roll in advance and supplied from the canvas supply roll. It is preferable to peel off the low-stretch member after the compound is attached to the canvas and impregnated with the compound.

  The method for producing a power transmission belt according to the present invention includes a first step of attaching a compound to at least one surface of a canvas or impregnating the compound to obtain a canvas with a compound, and a canvas with a compound, A second step of manufacturing the transmission belt so as to be embedded in the belt main body or attached to the belt main body. In the first step, the canvas is supplied while tension is applied in the supply direction, and the low stretch member is provided in at least a part of the area where the tension is applied on the other surface of the canvas. The low-stretch member is bonded, and is characterized in that at least a part of the tension is applied and the tension applied to the canvas is reduced.

  Moreover, in the manufacturing method of a power transmission belt, it is preferable to implement a 2nd process, after peeling the low elastic member adhere | attached on the canvas with a compound.

  According to the present invention, since a canvas with a composition can be produced without impairing the initial elongation characteristics of the canvas, a power transmission belt having excellent flexibility and the like can be produced using the canvas with the composition. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of the V-ribbed belt 10. In FIG. 1, a V-ribbed belt 10 includes a belt main body, and the belt main body includes a lower rubber layer 12 provided on the bottom surface side and an adhesive rubber layer 16 provided on the back surface side. Short fibers 19 are mixed in the lower rubber layer 12. The lower rubber layer 12 is provided with a plurality of V ribs 15 extending in the longitudinal direction of the belt in the width direction of the belt. A core wire 13 extending in the longitudinal direction of the belt is embedded in the boundary surface between the lower rubber layer 12 and the adhesive rubber layer 16. On the upper surface of the adhesive rubber layer 16 is provided a canvas 17 that is bonded over the entire surface. The lower rubber layer 12 and the adhesive rubber layer 16 are formed from an elastomer.

  FIG. 2 shows a method for manufacturing the canvas 48 with unvulcanized rubber used for the V-ribbed belt 10. FIG. 3 schematically shows a cross-sectional view of the canvas 48 with unvulcanized rubber. The canvas 48 with unvulcanized rubber is manufactured using the calendar roll machine 30. The calendar roll machine 30 includes a canvas supply roll 31, a pair of pressure-bonding rolls 32 and 33, a pair of rubber supply rolls 34 and 35, and a canvas winding roll 36. The pair of crimping rolls 32 and 33 are provided with a predetermined distance from the canvas supply roll 31. Here, one crimping roll 32 is provided above the other crimping roll 33 with a slight gap. One rubber supply roll 34 is further provided on the upper side of the pressure-bonding roll 32 with a slight gap therebetween. In the substantially horizontal direction of the rubber supply roll 34, the other rubber supply roll 35 is provided with a slight gap therebetween.

  A canvas 40 with a sheet is wound around the canvas supply roll 31. The canvas 40 with a sheet includes a canvas 17 and a low stretch sheet 47 bonded over the entire lower surface of the canvas 17. The low stretch sheet 47 is bonded to the canvas 17 with an adhesive having a relatively weak adhesive force so that it can be easily peeled off from the canvas 17. The sheet-attached canvas 40 is supplied from the canvas supply roll 31 between the crimping rolls 32 and 33. On the other hand, the unvulcanized rubber X is supplied between the rubber supply rolls 34 and 35, and the unvulcanized rubber X is rolled between the rubber supply rolls 34 and 35 and between the rolls 34 and 32 to have a predetermined thickness. The unvulcanized rubber layer 45 is supplied between the press rolls 32 and 33.

  The canvas 17 is a stretchable fabric, and preferably has stretchability in the longitudinal direction (the supply direction Y of the canvas 17). The canvas 17 is a fabric formed by weaving warp yarns extending along the longitudinal direction and weft yarns extending along the width direction, and is woven by plain weave, twill weave, satin weave, or the like. The warp and weft are composed of natural fibers, synthetic fibers, and the like, and are composed of, for example, nylon, aramid, carbon, polyester, polyethylene, cotton, or a mixed fiber thereof, preferably nylon. The weft may be composed of the same type of fiber as the warp, or may be composed of a different type of fiber. One of the warp and the weft is preferably a stretchable yarn having stretchability. When the canvas 17 is stretchable in the longitudinal direction, the warp is preferably a stretchable yarn. The elastic yarn is, for example, a wooly nylon yarn that is stretched in the longitudinal direction of the yarn by being crimped, for example.

  The low stretch sheet 47 is a cloth such as a fabric, a resin sheet having high rigidity and low stretch, or a metal sheet. The woven fabric is formed by weaving warp and weft, and is woven by plain weave, twill, satin weave, or the like. The warp and weft are composed of natural fibers, synthetic fibers, and the like, and are composed of, for example, nylon, aramid, carbon, polyester, polyethylene, cotton, or a mixed fiber thereof, preferably nylon. The weft may be composed of the same type of fiber as the warp, or may be composed of a different type of fiber. Here, the stretchability of the low stretch sheet 47 in the longitudinal direction (that is, the supply direction Y) is lower than the stretchability of the canvas 17 in the longitudinal direction. That is, when the low stretch sheet 47 is stretched in the longitudinal direction so as to extend at a predetermined elongation rate with respect to the original length, the tensile force per unit width at that time is the same as that of the canvas 17. It becomes stronger than the tensile force per unit width in the longitudinal direction when pulled.

  When the low stretch sheet 47 is a woven fabric, it is preferably a low stretch fabric. That is, the warp and weft of the fabric are preferably low stretch yarns that are not crimped or the like, and preferably have lower stretchability than the above-described stretch yarns. The warp and weft of the woven fabric preferably extend in the longitudinal direction and the width direction of the low stretch sheet 47, respectively. In this case, at least the warp stretchability of the warp yarn 17 extends in the longitudinal direction of the canvas 17. Lower than elasticity. Furthermore, the warp and weft of the fabric are preferably monofilament yarns. Further, the low stretch sheet 47 may be subjected to the above-described RFL treatment in advance before being joined to the canvas 17. On the other hand, when the low stretch sheet 47 is a resin sheet, the resin is, for example, nylon, polyethylene terephthalate (PET), or the like. When the low stretch sheet 47 is made of metal, for example, a metal mesh, a metal sheet, or the like is used.

  The unvulcanized rubber X is composed of unvulcanized rubber as a main component, and various additives such as known vulcanizing agents, vulcanization aids, anti-aging agents, and carbon black are appropriately added. Unvulcanized rubber includes, for example, natural rubber, styrene-butadiene rubber, chloroprene rubber, alkylated chlorosulfonated polyethylene, ethylene-propylene-diene terpolymer blend (EPDM), ethylene-propylene rubber (EPR), Nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, or the like, or a mixture thereof, is preferably composed of the same kind of rubber as that constituting the lower rubber layer 12.

  The unvulcanized rubber layer 45 is pressure-bonded to the upper surface of the canvas 17 between the pressure-bonding rolls 32 and 33, whereby a canvas 48 with unvulcanized rubber is formed. The unvulcanized rubber-equipped canvas 48 is wound around the pressure-bonding roll 33, then sent to the canvas winding roll 36, and wound around the canvas winding roll 36. Therefore, the canvas with sheet 40 is supplied between the pressure-bonding rolls 32 and 33 while a predetermined tension is applied in the supply direction Y (longitudinal direction of the canvas 17). Thus, the unvulcanized rubber layer 45 is pressure-bonded to the upper surface of the canvas 17 in a sufficiently stretched state without wrinkles and the like. That is, the unvulcanized rubber layer 45 is coated on the upper surface of the canvas 17 with a uniform and sufficient pressing force.

  Thus, when the canvas with a sheet 40 is supplied to the pressure-bonding rolls 32 and 33, tension is applied in the supply direction Y. Therefore, when the canvas 17 is alone (the low stretch sheet 47 is not joined) and is supplied to the press rolls 32 and 33, a large tension is applied in the longitudinal direction of the canvas 17 and the canvas 17 is remarkably stretched. The When the canvas 17 is remarkably elongated, the warp extending in the longitudinal direction of the canvas is plastically deformed, and the stretchability in the longitudinal direction is lost. As a result, the canvas 17 cannot expand and contract in the longitudinal direction, and its elongation characteristic is lost.

  However, in the present embodiment, a low stretch sheet 47 whose longitudinal stretchability is lower than that of the canvas 17 is joined to the lower surface of the canvas 17. Therefore, even if tension is applied in the longitudinal direction, the low stretch sheet 47 hardly stretches, and the canvas 17 bonded to the sheet hardly stretches. That is, the stretch characteristic in the longitudinal direction of the canvas 17 is hardly lost. Thereby, in this embodiment, the canvas 48 with an unvulcanized rubber which has the canvas 17 with the initial elongation characteristic can be manufactured.

  After being wound up, the canvas 48 with unvulcanized rubber is pulled out from the roll 36 again, cut into a predetermined length, and the low stretch sheet 47 is peeled off. Since the low stretch sheet 47 is attached to the lower surface of the canvas 17, when the canvas 48 with unvulcanized rubber is wound around the canvas winding roll 36, The upper surface of the vulcanized rubber layer 45 is prevented from sticking. Therefore, the canvas 48 with unvulcanized rubber can be easily pulled out from the roll 36. Further, since the low stretch sheet 47 is bonded to the canvas 17 with a relatively weak adhesive force, it is peeled off from the canvas 17 relatively easily.

  Note that the low stretch sheet 47 is bonded to the entire lower surface of the canvas 17, but may not be bonded to the entire lower surface. That is, the low stretch sheet 47 may be adhered to only a part of the lower surface of the canvas 17 to which tension is applied. Even if the low stretch sheet 47 is bonded to only a part of the lower surface of the canvas 17, the region of the canvas 17 to which the low stretch sheet 47 is bonded is less likely to be tensioned by the low stretch sheet 47. This is because the elongation characteristic of the region is not lost.

  When the low stretch sheet 47 is bonded to a part of the lower surface of the canvas 17, the low stretch sheet 47 is a belt-like sheet extending along the longitudinal direction of the canvas 17 as shown in FIG. 4. Is preferred. In this way, when the low stretch sheet 47 extends in a strip shape along the longitudinal direction (supply direction) of the canvas 17, the canvas 17 has not only the region where the low stretch sheet is bonded but also the other regions. Tension is less likely to be applied. This is because if some of the canvas regions are not stretched in the longitudinal direction, the other regions are difficult to stretch in the longitudinal direction.

  And it is preferable that two strip | belt-shaped sheets are provided as shown in FIG. 4, and are adhere | attached on the lower surface of the both ends in the width direction. When the belt-like sheet is bonded to the lower surface of the canvas 17, the thickness of the canvas 40 with a sheet (see FIG. 2) is different between a portion where the belt-like sheet is bonded and a portion where the belt-like sheet is not bonded. In the meantime, the thickness of the unvulcanized rubber X to be pressure-bonded is partially different. However, if a belt-like sheet is provided at both ends in the width direction, the thickness of the unvulcanized rubber X to be crimped is uniform except at both ends. For example, by removing both ends, The sheet | seat 48 with unvulcanized rubber to which the vulcanized rubber X was pressure-bonded can be obtained.

  In the present modification, a belt-like sheet extending in the longitudinal direction of the canvas 17 may be provided not only at both ends in the width direction but also at the center in the width direction. However, it is preferable that the width | variety of the strip | belt-shaped sheet | seat provided in a center part is shorter than the strip | belt-shaped sheet | seat provided in both ends so that the part from which thickness differs in the canvas 40 with a sheet | seat becomes as small as possible. Even when the low stretch sheet 47 is adhered to only a part of the lower surface, the low stretch sheet 47 has lower stretchability than the canvas 17 in the supply direction (longitudinal direction of the canvas 17) Y.

  The canvas 17 is preliminarily treated with RFL (resorcin formaldehyde latex) before the low stretch sheet 47 is bonded. That is, the canvas 17 is immersed in an RFL solution and then dried by heating, and the canvas 17 is impregnated with RFL. The RFL solution is an aqueous solution in which an RF resin that is an initial condensate of resorcin and formaldehyde is mixed with latex. The latex is, for example, a simple substance such as styrene butadiene latex, vinylpyridine / styrene / butadiene copolymer latex, chloroprene latex, or a mixture thereof.

  A specific example of the RFL process is shown in FIG. In the RFL process, a container 61 containing an RFL solution and a drying oven 62 for drying the canvas 17 by heat are prepared. A supply roll 63 and a pulling roll 64 are provided above the container, and a squeezing roll 65 is provided on the pulling roll 64 with a slight predetermined distance.

  The canvas 17 is sent to the supply roll 63, wound around the supply roll 63, then sent into the container 61, and immersed in the RFL solution in the container 61. The soaked canvas 17 is pulled up from the RFL solution by the pulling roll 64 and passed through a slight predetermined distance between the pulling roll 64 and the squeezing roll 65, and the RFL solution adhering to the canvas 17 in excess between these rolls. Is removed. The canvas 17 is supplied into the drying oven 62 from between the pulling roll 64 and the squeezing roll 65, and the canvas 17 taken out from the drying oven is taken up by the take-up roll 66.

  In the RFL process, as shown in FIG. 5, while the canvas 17 is fed from the supply roll 63 to the pulling roll 64, no tension is applied in the longitudinal direction, and the canvas 17 is slackened and sagging and sagging. In the state, it is immersed in the RFL solution. Therefore, the canvas is not significantly elongated in the longitudinal direction between the supply roll 63 and the pulling roll 64.

  Further, between the pulling roll 64 and the take-up roll 66, a tenter (not shown) made of a needle mountain that moves in accordance with the movement of the canvas 17 is provided on the lower surface side of the canvas 17. Accordingly, the canvas 17 is supplied from the pulling roll 64 to the winding roll 66 while being hooked on the tip of the tenter needle. With such a configuration, the canvas is not significantly elongated in the longitudinal direction between the pulling roll 64 and the winding roll 66. Further, the canvas 17 to which the RFL solution is attached is subjected to a force in the shrinking direction by heat in the drying oven 62, but is not shrunk because it is held by the tenter.

  As described above, in the RFL process of the present embodiment, the canvas 17 hardly stretches in the longitudinal direction, and therefore the stretch characteristics in the longitudinal direction of the canvas 17 are hardly lost.

  A modification of the RFL process will be described. A modification of the RFL process will also be described with reference to FIG. In the above-described embodiment, the canvas 17 is subjected to the RFL process without the low stretch sheet 47 being bonded, but in the present modification, the canvas 40 with a sheet to which the low stretch sheet 47 is bonded is the RFL process. Is done.

  That is, the canvas 40 with a sheet is immersed in the RFL solution as in the above-described embodiment, and the RFL solution that is excessively attached to the canvas 40 with a sheet is removed between the pulling roll 64 and the squeezing roll 65. The sheeted canvas 40 is supplied into the drying oven 62 from between the pulling roll 64 and the squeezing roll 65, and the sheeted canvas 40 taken out from the drying oven 62 is wound around the winding roll 66.

  In the embodiment described above, a tenter (not shown) is provided on the lower surface side of the canvas 17 between the pulling roll 64 and the take-up roll 66. However, in the present modification, no tenter is provided. Therefore, when the canvas with a sheet 40 is supplied from the pulling roll 64 to the take-up roll 66, tension is applied in the longitudinal direction (supply direction). That is, when the canvas 17 is supplied alone (the low stretch sheet 47 is not joined), the canvas 17 is stretched in the longitudinal direction and the stretch characteristic is lost.

  However, in this modification, a low stretch sheet 47 whose longitudinal stretchability is lower than that of the canvas 17 is joined to the lower surface of the canvas 17. Therefore, even if tension is applied in the longitudinal direction, the low stretch sheet 47 hardly stretches, and the canvas 17 bonded to the sheet hardly stretches. That is, the stretch characteristic in the longitudinal direction of the canvas 17 is hardly lost.

  In addition, the canvas 40 with a sheet is subjected to a force in a direction in which it is contracted by heat in the drying oven 62. However, in this modification, even if a force is applied in the contraction direction in the longitudinal direction, the low stretch sheet 47 is hardly contracted, and the canvas 17 bonded to the sheet is hardly contracted. Further, the low stretch sheet 47 is bonded over the entire lower surface of the canvas 17. Therefore, shrinkage due to heat acting in the width direction can be reduced by the action of the low stretch sheet 47. Note that. Also in the width direction, in order to reduce shrinkage due to heat, it is preferable that the stretchability of the low-stretch sheet 47 in the width direction is lower than the stretchability of the canvas in the width direction.

  As described above, even in the RFL processing of the modified example, the canvas 17 hardly stretches in the longitudinal direction, so that the stretch characteristic in the longitudinal direction of the canvas 17 is hardly lost. In the drying process, the canvas 17 is not easily heat-shrinked. Also in this modification, the canvas 40 with a sheet is taken up by the take-up roll 66 and then pulled out from the roll again, and the low stretch sheet 47 is peeled off.

  In the embodiment and the modified example, the canvas 17 is subjected to the RFL treatment, but the canvas 17 may be subjected to any immersion / heating treatment instead of the RFL treatment, for example, a rubber paste treatment.

  In the rubber paste process, as in the RFL process, the canvas 17 (or the canvas 40 with a sheet) is immersed in the rubber paste solution and then dried by heating. The rubber paste solution is prepared by dissolving unvulcanized rubber in a solvent such as MEK (methyl ethyl ketone) or toluene, and adding a predetermined additive such as a vulcanizing agent or carbon black. Unvulcanized rubber is natural rubber, styrene-butadiene rubber, chloroprene rubber, alkylated chlorosulfonated polyethylene, ethylene-propylene-diene terpolymer blend (EPDM), ethylene-propylene rubber (EPR), nitrile rubber , Hydrogenated nitrile rubber, carboxylated nitrile rubber, fluorine rubber or the like alone or a mixture thereof.

  FIG. 6 shows a method for manufacturing the V-ribbed belt 10. The rubberized canvas 48 from which the low stretch sheet 47 has been peeled is formed into a ring shape by joining the ends thereof so that the longitudinal direction thereof is the longitudinal direction of the belt 10 (the direction in which a ring is formed). As shown in FIG. 6, the rubberized canvas 48 formed in a ring shape is placed on the cylindrical drum 50 so that the unvulcanized rubber layer 45 is on the outside.

  In the cylindrical drum 50, the core wire 13 and the lower rubber sheet 52 mixed with the short fibers 19 are wound around the unvulcanized rubber layer 45 of the rubberized canvas 48 in order. Here, the lower rubber sheet 52 includes an unvulcanized rubber component as a main component, and a predetermined part by weight of a known vulcanizing agent, a vulcanizing aid, an anti-aging agent, carbon black, and the like is blended. Unvulcanized rubber components include, for example, natural rubber, styrene-butadiene rubber, chloroprene rubber, alkylated chlorosulfonated polyethylene, ethylene-propylene-diene terpolymer blend (EPDM), ethylene-propylene rubber (EPR) , Nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, or the like, or a mixture thereof.

  The cylindrical drum 50 around which these rubber sheets and the like are wound is placed in a vulcanizing pot (not shown) and heated under pressure at a predetermined temperature and pressure. The core wire 13 is pushed inward by the lower rubber sheet 52 by pressure heating, and is buried between the lower rubber sheet 52 and the unvulcanized rubber layer 45. The unvulcanized rubber layer 45 and the lower rubber sheet 52 are vulcanized by pressure heating, and the lower rubber sheet 52, the unvulcanized rubber layer 45, and the canvas 17 are bonded. Thereby, the canvas 17, the unvulcanized rubber layer 45, the core wire 13, and the lower rubber sheet 52 are integrally molded, and a flat belt-like vulcanized sleeve is obtained. The vulcanization sleeve is cut to a predetermined width according to the belt width. The unvulcanized rubber layer 45 and the lower rubber sheet 52 correspond to the adhesive rubber layer 16 and the lower rubber layer 12, respectively, in the V-ribbed belt 10. The V-ribbed 15 extending in the longitudinal direction of the belt is formed on the lower rubber layer 12 of the vulcanized sleeve cut to a predetermined width by a grinding wheel (not shown), thereby forming the V-ribbed belt 10 shown in FIG. Is done.

  As described above, since the canvas 17 is used in the V-ribbed belt 10 without losing its longitudinal elongation characteristics, the V-ribbed belt 10 in this embodiment is excellent in bending resistance and has good transmission performance and belt life. Have.

  In this embodiment, the case where the power transmission belt is a V-ribbed belt has been described. However, the type of power transmission belt is not particularly limited, and examples thereof include a V belt, a toothed belt, a flat belt, and a round belt. May be. Further, as shown in FIG. 1, the canvas 17 is provided on the outermost surface of the belt, but it may not be provided on the outermost surface, and may be embedded in the belt body.

  Further, in the present embodiment, after the RFL process (or rubber paste process) is performed, the power transmission belt is manufactured using the canvas to which the unvulcanized rubber is pressure-bonded. The canvas to be used is not limited to this configuration, and may be a canvas that has been subjected only to RFL processing (or rubber paste processing) and to which unvulcanized rubber has not been pressure-bonded. Moreover, the canvas which RFL process etc. were not performed and the unvulcanized rubber was crimped | bonded may be used.

  Hereinafter, the present embodiment will be specifically described using examples and comparative examples. In this example and comparative example, the effects of this embodiment were confirmed by manufacturing canvases with unvulcanized rubber and measuring the elasticity of each canvas. Further, in order to confirm that the stretchability of the low stretch sheet is lower than the stretchability of the canvas, the stretchability was also measured for the low stretch sheet and the canvas.

  In the measurement of stretchability, the canvas with unvulcanized rubber, the canvas and the low stretch sheet were cut to prepare measurement sheets each having a width of 25 mm and a length of 50 cm. At this time, it cut | disconnected so that the length direction of the sheet | seat for a measurement might correspond with longitudinal directions, such as a canvas with unvulcanized rubber. The stretchability was measured by extending the measurement sheet in the length direction every 10% of elongation and measuring the tensile force at each elongation (every 10%). Here, the elasticity was measured until each measurement sheet was broken. In the measurement of stretchability, both ends of the measurement sheet were sandwiched between chucks, and the both ends were pulled by a tensile tester (Shimadzu Autograph AG-E (trade name, manufactured by Shimadzu Corporation)). . In addition, two marked lines with a distance of 10 cm in the longitudinal direction are drawn at the center in the length direction of the measuring sheet, and the length between the marked lines (that is, the length of the measuring sheet to which a tensile force is applied). A) With respect to 10 cm, the elongation was measured every 10%.

  In this example, a low stretch sheet is attached to the lower surface of the RFL-treated canvas, and an unvulcanized rubber layer is pressure-bonded to the upper surface of the canvas with the sheet. The canvas was a woven fabric in which warp yarns extending in the longitudinal direction and weft yarns extending in the width direction were woven by plain weaving. The warp yarn was a wooly nylon yarn that was stretched in the longitudinal direction of the yarn by being crimped. The weft was a nylon thread made of the same material as the warp and not crimped. The RFL treatment was performed by heating and drying at 160 ° C. for 1 minute after being immersed in the RFL solution. In this drying process, canvas was supplied using a tenter. Here, the latex of the RFL liquid was a mixture of styrene butadiene latex and chloroprene latex. The stretchability of the RFL-treated canvas was as shown in the graph (1) in FIG. Further, as shown in the graph (1), the canvas was broken at an elongation rate of 73%, and the tensile force, that is, the tensile strength at that time was 330N.

  A low stretch sheet was bonded to the back of the RFL-treated canvas. The low stretch sheet is a low stretch fabric in which the warp extending in the longitudinal direction and the weft extending in the width direction are woven by plain weaving, and the warp and weft are each a twisted nylon yarn, It was an elastic yarn. The stretchability of the low stretch sheet was as shown in the graph (2) in FIG. That is, at a stretch rate of 0 to 26%, when the low stretch sheet was stretched in the longitudinal direction, the tensile force was higher than when the RFL-treated canvas was stretched at the same stretch rate (graph ( 1)). In other words, the stretchability of the low stretch sheet was lower than that of the RFL treated canvas. Further, as shown in the graph (2), this low stretch sheet was broken at an elongation of 26%, and the tensile force, that is, the tensile strength at that time was 83N.

  The canvas with a sheet to which the low stretch sheet is bonded is supplied between a pair of pressure-bonding rolls while applying tension in the longitudinal direction thereof, and unvulcanized rubber is pressure-bonded between the rolls. A canvas with vulcanized rubber was obtained. As the unvulcanized rubber, a material mainly composed of EPDM was used. The width of the canvas with a sheet was 800 mm, and the tension applied in the longitudinal direction was 50 kg weight. The canvas with unvulcanized rubber was measured for stretchability after peeling off the low-stretch sheet adhered thereto. The measurement result of stretchability was as shown in the graph (3) in FIG. Moreover, as shown in the graph (3), the unvulcanized rubber-attached canvas of the example broke at an elongation rate of 75%, and the tensile force at that time, that is, the tensile strength was 350 N.

  In the comparative example, an unvulcanized rubber layer is pressure-bonded to an RFL-treated canvas to which a low stretch sheet is not bonded. The comparative example was the same as the example except that the low stretch sheet was not adhered to the canvas. The measurement result of the stretchability of the canvas with the unvulcanized rubber of the comparative example is as shown in the graph (4) in FIG. Further, as shown in the graph (4), the canvas with unvulcanized rubber of the comparative example was broken at an elongation rate of 36%, and the tensile force, that is, the tensile strength at that time was 370N.

  From the graphs (1) and (4), it can be understood that the stretchability in the longitudinal direction of the canvas with unvulcanized rubber of the comparative example is significantly deteriorated with respect to the stretchability in the longitudinal direction of the canvas. That is, in this comparative example, when unvulcanized rubber is pressure-bonded to the canvas, tension acts in the longitudinal direction of the canvas, but the stretch characteristics in the longitudinal direction of the canvas are greatly lost due to the action of the tension. Can understand.

  On the other hand, from the graphs (1) and (3), it can be understood that the stretchability in the longitudinal direction of the canvas with unvulcanized rubber of this example is equivalent to the stretchability in the longitudinal direction of the canvas. That is, in this example, when the unvulcanized rubber is pressure-bonded to the canvas, a tension acts in the longitudinal direction of the canvas, but it can be understood that the stretch characteristics in the longitudinal direction of the canvas were not lost by the tension. This is because in this embodiment, the low stretch sheet is bonded to the canvas, and the low stretch sheet prevents the canvas from stretching in the longitudinal direction.

It is sectional drawing which shows the V-ribbed belt which concerns on this embodiment. It is a schematic diagram which shows the manufacturing method of the canvas with unvulcanized rubber. It is sectional drawing which shows the canvas with unvulcanized rubber. It is a schematic diagram which shows a RFL process typically. It is a typical perspective view which shows the modification of the canvas with a sheet | seat. It is sectional drawing which shows typically the manufacturing method of V ribbed belt. It is a graph which shows the relationship between the elongation rate in the longitudinal direction, and tensile force, such as a canvas with unvulcanized rubber.

Explanation of symbols

10 V-ribbed belt (power transmission belt)
12 Lower rubber layer (belt body)
16 Adhesive rubber layer (belt body)
17 Canvas 32, 33 Press roll 40 Canvas with sheet 45 Unvulcanized rubber layer 47 Low stretch sheet 48 Canvas with unvulcanized rubber (canvas with rubber)
X Unvulcanized rubber

Claims (19)

The canvas was fed while applying a tension to the feed direction, by crimping formulation on one surface of the canvas, in the manufacturing method of the formulations with canvas to obtain a formulation with canvas,
The canvas is a stretchable woven fabric composed of yarns extending in each of the supply direction and a direction orthogonal to the supply direction, and the yarn extending in the supply direction is a stretchable yarn,
Supplying the canvas while applying tension to the supply direction between a pair of crimping rolls, supplying the compound, and crimping the compound on one surface of the canvas between these crimping rollers,
When said canvas is supplied between the pair of presser rolls in the other surface of the canvas, in the region where the tension is Ru is action, are low-stretch member adhered to at least part of the region, the At least a portion of the tension in the low elastic member acts, tension that will be applied to the canvas is reduced method for producing formulations with canvas, wherein Rukoto. The method for producing a canvas with a blend according to claim 1, wherein the low stretchable member is a low stretchable belt-like sheet extending at least in a supply direction in a region where the tension is applied. 3. The composition according to claim 2, wherein two low-stretch belt-like sheets are provided, and each is bonded to the other surface side of both ends of the canvas in a direction orthogonal to the supply direction. A method of manufacturing a canvas with a pad. The method for producing a canvas with a blend according to claim 1, wherein the low stretchable member is lower than the stretchability of the canvas in the supply direction. The method for producing a canvas with a blend according to claim 1, wherein the low stretch member is a low stretch sheet bonded to the entire other surface. The method for producing a canvas with a blend according to claim 1 , wherein the low stretch sheet is a low stretch fabric. The canvas, the prior low-stretch member is bonded, and characterized in that after being immersed in a solution containing the formulation is fed to Drying device Drying has been formulation is attached to the canvas A method for producing a canvas with a blend according to claim 1. 8. The canvas with a composition according to claim 7, wherein the canvas is sent in the supply direction and supplied into the solution in a relaxed state so that no tension is applied in the supply direction. Production method. The said canvas is supplied in the said solution while being sent between two rolls, The manufacturing method of the canvas with a formulation of Claim 8 characterized by the above-mentioned. The said canvas is sent to the said supply direction in the state hooked on the needle | hook tip of the tenter which moves according to the movement of the said canvas inside the said drying apparatus. A method for producing a canvas with a composition as described in 1. The method for producing a canvas with a blend according to any one of claims 7 to 10, wherein the canvas dried by the drying device is wound on a winding roll. The method for producing a canvas with a blend according to claim 7, wherein the blend contained in the solution is rubber glue or RFL. The method for manufacturing a canvas with a blend according to claim 1, wherein the blend to be pressure-bonded to one surface of the canvas is an unvulcanized rubber. The method for producing a canvas with a blend according to claim 1 , wherein the stretchable yarn is a crimped yarn. The method for producing a canvas with a blend according to claim 1 , wherein the elastic yarn is a nylon yarn. The method for producing a canvas with a blend according to claim 1 , wherein the canvas is wound around a canvas supply roll in advance and supplied between the pair of pressure rollers from the canvas supply roll. After crimping the formulation to the canvas, the production method of formulation with canvas according to claim 1, characterized in that for peeling the low-stretch member. 2. The method for producing a canvas with a blend according to claim 1, wherein the canvas, in which the blend is pressure-bonded to the one surface, is sent to a winding roll and wound up. The canvas with a composition manufactured by the method for manufacturing a canvas with a composition according to any one of claims 1 to 18 is embedded in or stuck to the belt body. A method for producing a power transmission belt, comprising producing a transmission belt.

Images