JP4478600B2 - Conveyor flat belt - Google Patents

Description

  The present invention relates to a conveying flat belt, and more particularly to a conveying flat belt used for conveying paper sheets.

  The transport flat belt is used for transporting various transported materials such as paper sheets. For example, a belt having canvas bonded to the transport surface, or a layer formed of resin or rubber is provided on the transport surface. The belt is known.

  The transport flat belt with the canvas bonded to the transport surface is used to transfer the undried ink to the canvas and transfer the ink to the canvas when the transported paper is, for example, printed matter. May be impregnated. Here, the fibers constituting the canvas can hold a predetermined amount of ink, and if the amount of ink impregnated in the fiber is equal to or less than the predetermined amount, the ink impregnated in the canvas is used as the canvas. It does not ooze out to the surface. Therefore, even if the paper sheet contacts the canvas surface impregnated with a predetermined amount or less of the ink, the impregnated ink is not re-transferred to the paper sheet.

  However, the amount of ink impregnated in the fiber increases, and if the predetermined amount is exceeded, the fiber cannot hold the impregnated ink. In this state, when the paper sheet contacts the canvas surface, the impregnated ink is retransferred to the paper sheet, and the paper sheet is contaminated. Further, the ink impregnated in the fiber is difficult to remove from the fiber by wiping with, for example, alcohol, and once the predetermined amount or more of ink is impregnated in the fiber, the belt is made of paper sheets. It becomes difficult to use it for transportation.

Further, as a transport flat belt having a resin layer formed on a transport surface, as described in Patent Document 1, a belt whose surface is covered with a fluororesin film is known. Since the fluororesin film has water repellency and oil repellency, undried ink is hardly transferred onto the belt surface. In addition, even if the ink is transferred, the transferred ink does not penetrate into the fluororesin layer film. Therefore, the ink paper transferred to the belt is wiped off by wiping the ink with alcohol or the like. Retransfer to leaves is effectively prevented.
JP 2000-136209 A

  However, a belt whose transport surface is covered with a fluororesin film has a high hardness and is liable to damage paper sheets. Further, when the fluororesin film is provided on the conveying surface, the flexibility of the belt is deteriorated, and for example, it is difficult to use the conveying belt around a small-diameter pulley. Further, the fluororesin film has a problem that the adhesiveness with the belt main body is not good and is easily peeled off from the belt main body. Accordingly, the present invention has been made in view of these problems, and a main object thereof is to provide a transport flat belt suitable for transporting printed matter.

  The conveying flat belt according to the present invention is a conveying flat belt having at least one surface coated with a canvas, and a mixture containing a binder and a fluororesin is fixed to the surface of each yarn constituting the canvas. It is characterized by that.

  Here, for example, the mixed solution containing the mixture is allowed to penetrate into the canvas and then dried, so that the mixture is fixed to the surface of each yarn. The binder includes, for example, any of urethane resin, rubber latex, or acrylic resin.

  The canvas is composed of a yarn extending in the belt longitudinal direction and a yarn extending in the belt width direction, and the yarn extending in the belt longitudinal direction is preferably a multifilament. The multifilament has a large surface area of the yarn and has been easily impregnated with the conventional ink. However, the ink can be effectively repelled by fixing the mixture. Further, the mixture is easily fixed in a large amount on the canvas, and the water and oil repellent effect is easily obtained. On the other hand, the yarn extending in the belt width direction is, for example, a monofilament.

  The canvas is composed of a yarn extending in the belt longitudinal direction and a yarn extending in the belt width direction, and the yarn extending in the belt longitudinal direction preferably has stretchability. As a result, the canvas is particularly flexible in the longitudinal direction.

  At least one surface of the belt main body having the canvas core is covered with the canvas, and the canvas core has a higher tensile rigidity than the canvas at least in the belt longitudinal direction. Thereby, the belt can obtain tension necessary for conveyance in the longitudinal direction and can also bend.

  In the transporting flat belt according to the present invention, the other surface may be covered with a canvas, and a mixture containing a binder and a fluororesin may be fixed to the surface of each yarn constituting the canvas.

  According to the present invention, since the canvas coated on the belt surface has a fluororesin fixed to each thread and has a water / oil repellent effect, it can repel ink in contact with the surface. Further, since the fluororesin is not formed in layers, the flexibility of the belt surface is not impaired. Therefore, the transport belt of the present invention does not damage transported materials such as paper sheets and can have a certain flexibility. In addition, since the mixture contains a binder, the fluororesin remains adhered to the canvas even after wiping the belt surface with alcohol or the like, and the water / oil repellency of the belt can be maintained over a long period of time. is there.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of the conveying flat belt, FIG. 2 is a sectional perspective view of the conveying flat belt, and FIG. 3 is a sectional view of the conveying flat belt taken along the line III-III in FIG. As shown in FIG. 1, the conveying flat belt 10 is an endless belt.

  As shown in FIGS. 2 and 3, the conveying flat belt 10 has a belt main body 11, and the belt main body 11 is configured by laminating first and second elastomer layers 13 and 14 on both surfaces of a core canvas 12. The An outer peripheral surface canvas 15 and an inner peripheral surface canvas 16 are coated and laminated on both surfaces of the belt main body 11, and these canvases respectively form an outer peripheral surface and an inner peripheral surface of the conveying flat belt 10.

  The core canvas 12 is a woven fabric woven by warp yarns 22 extending in the longitudinal direction of the belt and weft yarns 23 extending in the width direction of the belt. The core canvas 12 is composed of warp yarns 22 and weft yarns 23 having high rigidity so as to resist the force applied in the longitudinal direction and width direction of the belt, and the core canvas 12 is at least the longitudinal direction of the belt. In the direction, the tensile rigidity is higher than that of the outer peripheral canvas 15 and the inner peripheral canvas 16. The warp yarn 22 and the weft yarn 23 are preferably composed of multifilaments, and are composed of, for example, polyester, nylon, aramid, or a mixed fiber thereof. Here, for example, polyethylene terephthalate is used as the polyester. In addition, the comparison of the tensile rigidity of canvas, etc. shows that when the same width canvas is pulled at the same speed in the length direction with a tensile tester, the tensile elongation is the same (for example, 10% with respect to the original length). This is done by comparing forces.

  As for the 1st and 2nd elastomer layers 13 and 14, a thermoplastic elastomer is comprised as a polymer component, and various additives are added as needed. As the thermoplastic elastomer, a simple substance such as a polyurethane-based elastomer, a polyester-based elastomer, a polyamide-based elastomer, a polyolefin-based elastomer, or a mixture thereof is used. Note that the warp yarn 22 and the weft yarn 23 of the core canvas 12 have entered the first and second elastomer layers 13 and 14.

  The outer peripheral surface canvas 15 is a woven fabric woven by warp yarns 25 extending along the longitudinal direction of the belt and weft yarns 26 extending along the width direction of the belt. Similarly, the inner surface canvas 16 is a woven fabric woven by warp yarns 27 extending along the longitudinal direction of the belt and weft yarns 28 extending along the width direction of the belt.

  The warp warp yarns 25 and 27 are stretchable, and the weft yarns 26 and 28 are made of non-stretchable high-rigidity yarns, so that the outer peripheral surface canvas 15 and the inner peripheral surface canvas 16 are in the longitudinal direction of the belt. Has elasticity and high rigidity in the width direction. The warp yarns 25 and 27 are multifilaments, for example, bulky processed yarns or multifilaments formed by winding a covering yarn around an elastic yarn as a core yarn. The bulky processed yarn is a crimped yarn obtained by crimping, for example, a multifilament in which a plurality of yarns are bundled, and is, for example, a wooly nylon yarn. The wefts 26 and 28 are spun yarns or monofilaments, for example, polyester monofilaments. The outer peripheral surface canvas 15 and the inner peripheral surface canvas 16 are formed by being appropriately selected from the above configurations, but the outer peripheral surface canvas 15 and the inner peripheral surface canvas 16 may have the same configuration or different configurations. There may be.

  Each of the above-mentioned “warp” and “weft” means a yarn extending along the longitudinal direction and the width direction of the belt, and “warp” is a warp or weft as a woven structure. Similarly, the “weft” may be a weft or a warp as a woven structure.

  A mixture containing a binder and a fluororesin is fixed to the surface of each yarn (for example, each filament) constituting the warp yarn 25 and the weft yarn 26 of the outer peripheral canvas 15. The fluororesin is not particularly limited as long as it has a water / oil repellent effect, and is, for example, a polymer having a perfluoroalkyl group. As the binder, for example, urethane resin, rubber latex, acrylic resin, or a mixture thereof is used, and urethane resin or rubber latex is preferable. This is because urethane resin and rubber latex have low hardness, and even if they are attached to the fiber surface, the flexibility of the belt is not lowered so much.

  The urethane resin is not particularly limited. For example, a polyester urethane resin is used, and for the rubber latex, for example, acrylonitrile-butadiene copolymer latex, carboxy-modified acrylonitrile-butadiene copolymer latex, or the like is used. The acrylic resin is not particularly limited, but is made by copolymerizing various monomers such as acrylic acid, methacrylic acid, styrene, and acrylonitrile with an acrylic ester or a methacrylic ester.

  The mixture containing the binder and the fluororesin is obtained by infiltrating the fluororesin mixture between the yarns constituting the warp yarn 25 and the weft yarn 26, adhering them to the surface of each yarn, and then drying by heating. It is fixed to the surface. The fluororesin mixed solution is a mixed solution obtained by dispersing and dissolving a binder, a fluororesin, and other additives in a medium (water or an organic solvent). In view of environmental load and easy handling, the medium is preferably an aqueous (particularly water) medium, and the binder and fluororesin are preferably dispersible or soluble in water, and the urethane resin It is better to use water-based urethane resin.

  The permeation of the fluororesin mixed solution into the warp yarn 25 and the weft yarn 26 is performed by coating or spraying the fluororesin mixed solution on one surface of the outer peripheral surface canvas 15 (the outer peripheral surface side of the belt). The coating or spraying of the fluororesin mixed solution is preferably performed on the outer peripheral surface of the belt after the outer peripheral surface canvas 15 is bonded onto the belt main body 11 to form a laminate. Of course, the coating may be performed on the outer peripheral canvas 15 alone before the outer peripheral canvas 15 is bonded onto the belt body 11.

  In the present embodiment, the mixture containing the binder and the fluororesin is not fixed to the surface of each thread of the inner peripheral canvas 16. However, a mixture containing a binder and a fluororesin may be fixed to the surface of each thread constituting the inner peripheral canvas 16 as well as the outer peripheral canvas 15. In this case, the fluororesin mixed solution that permeates the inner peripheral canvas 16 may have the same composition as the mixed liquid that permeates the outer peripheral canvas 15 or may be different.

  The transport flat belt 10 is wound around, for example, a plurality of pulleys, and is transported by being rotated in a state where the transport object is placed on the outer peripheral surface of the transport flat belt 10. The outer peripheral surface of the conveying flat belt 10 is constituted by an outer peripheral surface canvas 15, and a mixture of a fluororesin and a binder is fixed to each thread constituting the outer peripheral surface canvas 15. Therefore, for example, even if the conveyed product is a printed product and the undried ink of the printed product comes into contact with the outer peripheral canvas 15, the ink is not easily transferred to the outer peripheral canvas 15 due to the water and oil repellent effects of the fluororesin. Even if the ink is transferred to the outer peripheral canvas 15, the ink is not impregnated inside the fibers of each thread of the outer peripheral canvas 15 due to the water-repellent and oil-repellent effects of the fluororesin. Since the ink transferred to the outer peripheral canvas 15 can be easily wiped off with alcohol or the like if it is not impregnated inside the fiber, retransfer of the ink to the printed matter can be effectively prevented.

  The fluororesin is fixed to the surface of each thread of the outer peripheral canvas 15 together with the binder. Therefore, even if the belt is wiped with alcohol or the like, the fluororesin is hardly removed from the surface of each yarn due to the adhesive action of the binder. Therefore, the conveying flat belt 10 can maintain the water / oil repellent effect of the outer peripheral canvas 15 over a long period of time.

  Further, the mixture containing the fluororesin and the binder is not laminated in a layered manner, and is fixed to the surface of each yarn constituting the outer peripheral surface canvas 15. Therefore, the belt outer peripheral surface can maintain the stretchability and flexibility of the canvas, so that the flexibility of the belt does not deteriorate and the paper sheet or the like being conveyed is not damaged by the belt outer peripheral surface.

  Moreover, in this embodiment, since the warp yarn 25 of the outer peripheral surface canvas 15 is a multifilament, the surface area of the filament is larger than when a monofilament is used. Therefore, the mixture is easily fixed to the canvas in a large amount, and the water and oil repellent effect is easily obtained.

  4 and 5 show first and second modifications of the transporting flat belt 10, respectively. In this embodiment, the inner peripheral canvas 16 is provided. However, as shown in the first modification, the inner peripheral canvas 16 may not be provided on the inner peripheral surface side of the belt body 11. In the first modified example, the belt main body 11 is configured by laminating a third elastomer layer 17 on the inner peripheral surface side of the core canvas 12 and a first elastomer layer 13 on the outer peripheral surface side. The elastomer layer 17 forms the inner peripheral surface of the conveying flat belt 10. Since the core canvas 12, the first elastomer layer 13, and the outer peripheral canvas 15 have the same configuration as that of the first embodiment, the description thereof is omitted. The third elastomer layer 17 is composed of rubber or a thermoplastic elastomer as a polymer component, and various additives are added as necessary. As the rubber, natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, ethylene propylene rubber, chloroprene rubber, chlorinated polyethylene, epichlorohydrin rubber, nitrile rubber, acrylic rubber, urethane rubber, etc., or a mixture thereof are used. . As the thermoplastic elastomer, a simple substance such as a polyurethane-based elastomer, a polyester-based elastomer, a polyamide-based elastomer, a polyolefin-based elastomer, or a mixture thereof is used.

  In the first modification, the outer peripheral canvas 15 may not be provided, and only the inner peripheral canvas 16 may be provided. In this case, the inner peripheral canvas 16 is fixed with a mixture containing a fluororesin and a binder.

  Further, in the present embodiment, the core body canvas 12 is provided at the center of the belt main body 11, but as shown in the second modification, the belt main body 11 is not provided with the core body canvas 12, and the elastomer layer. It may consist only of. Note that the configuration of the elastomer layer is the same as that of the first and second elastomer layers 13 and 14 of the present embodiment, and therefore description thereof is omitted. However, in the second modified example, since the core body canvas is not provided, the belt body 11 has a tensile rigidity in the longitudinal direction of the outer peripheral canvas 15 and the inner peripheral canvas 16 in order to provide rigidity in the longitudinal direction. Higher is better.

  Furthermore, in the present embodiment and the present modification, the core body canvas 12, the outer peripheral canvas 15, and the inner peripheral canvas 16 are woven fabrics, but may be knitted fabrics. Further, the mixture containing the fluororesin and the binder may not be fixed to each yarn constituting the outer peripheral canvas 15 but may be fixed only to each yarn constituting the inner peripheral canvas 16.

  The present embodiment will be described below using examples, but the present invention is not limited to the configurations of the following examples.

[Configuration of fluororesin mixture]
In Example 1, a polyester urethane resin that is a water-based urethane resin was used as the binder, and perfluoroalkyl acrylate was used as the fluororesin. In Example 2, acrylic resin acrylonitrile / acrylic acid alkyl ester / styrene / methacrylic acid copolymer resin was used as the binder, and perfluoroalkyl acrylate was used as the fluororesin. In Example 3, a carboxy-modified acrylonitrile-butadiene copolymer latex, which is a rubber latex, was used as a binder, and perfluoroalkyl acrylate was used as a fluororesin. In addition, the thickener (acrylic acid ester copolymer resin), the antifoamer (hydrocarbon oil), and the anion activator were added to the fluororesin liquid mixture of Examples 1-3 as an additive. Moreover, in the fluororesin liquid mixture of Examples 1-3, water was used as a medium.

[Configuration of conveyor flat belt]
The conveyance flat belts of Examples 1 to 3 are belts having the configuration shown in FIG. 2, and first and second elastomer layers are laminated on both surfaces of the core canvas, and the first and second elastomer layers are laminated. The outer peripheral surface side and the inner peripheral surface side were respectively coated with the outer peripheral surface canvas and the inner peripheral surface canvas. Here, the core body canvas was a woven fabric woven with polyester multifilament warp and polyester spun weft. As the polymer for the first and second elastomer layers, an ester-based thermoplastic polyurethane elastomer was used. The inner peripheral canvas and the outer peripheral canvas were woven fabrics in which the warp yarn was nylon wooly yarn and the weft yarn was polyester monofilament. After the outer peripheral surface canvas is coated on the first elastomer layer, the outer peripheral surface side is coated with a fluororesin mixed solution (knife coating) from the outer peripheral surface side, and is heated and dried, whereby the mixture containing the binder and the fluororesin becomes the outer peripheral surface canvas. It was fixed to the surface of each yarn constituting the.

[Comparative example]
In the transport flat belt of the comparative example, coating was performed using a mixed liquid containing no fluororesin in place of the fluororesin mixed liquid. The mixed liquid of the comparative example was the same mixed liquid as in Example 1 except that no fluororesin was blended. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

[Belt evaluation]
By visually confirming the state when a drop of ink is dropped on the outer peripheral surface of each transport flat belt (ie, on the outer peripheral canvas) and the state of the outer peripheral surface after wiping the dropped ink with ethanol Each transport flat belt was evaluated.

  In the transport flat belts of Examples 1 to 3, when ink was dropped, the ink was repelled by the outer peripheral canvas and remained on the outer peripheral canvas. On the other hand, when ink was dropped in the transport flat belt of the comparative example, a part of the ink penetrated into the outer peripheral canvas.

  In addition, the transport flat belts of Examples 1 to 3 were able to remove the ink from the canvas surface almost completely when the ink was wiped off after the ink was dropped. On the other hand, in the belt of the comparative example, a part of the ink remained impregnated in the outer peripheral canvas. Furthermore, even when the transport flat belts of Examples 1 to 3 were repeatedly dropped with ink on the outer circumferential surface and repeatedly wiped with alcohol, the ink hardly penetrated into the outer circumferential canvas.

  As described above, in this embodiment, it can be understood that the outer peripheral surface canvas has a water / oil repellent effect because the fluororesin is fixed to each filament constituting the canvas. Further, since the mixture contains a binder, the fluororesin remains adhered to the canvas even after the surface of the belt is wiped with alcohol or the like, and the water / oil repellency effect of the belt is maintained.

It is a perspective view of the flat belt for conveyance concerning this embodiment. It is a cross-sectional perspective view of a flat belt for conveyance. It is sectional drawing on the III-III line in FIG. 2 of the flat belt for conveyance. It is sectional drawing of the flat belt for conveyance which concerns on a 1st modification. It is sectional drawing of the flat belt for conveyance which concerns on a 2nd modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flat belt for conveyance 11 Belt main body 12 Core body canvas 13 1st elastomer layer 14 2nd elastomer layer 15 Outer surface canvas 16 Inner surface canvas 17 3rd elastomer layer 25, 27 Warp yarn 26, 28 Weft

Claims (8)

A transporting flat belt having at least one surface coated with canvas,
The canvas is composed of a thread extending in the belt longitudinal direction and a thread extending in the belt width direction, and the thread extending in the belt longitudinal direction has elasticity,
A mixture comprising a fluororesin that is a perfluoroalkyl acrylate and a binder for fixing the fluororesin to each yarn surface that constitutes the canvas is not layered on the canvas surface that constitutes the belt surface. A flat belt for conveyance, which is fixed to the surface of each yarn constituting a canvas.   The transporting flat belt according to claim 1, wherein the mixture is fixed to the surface of each yarn by allowing the mixed solution containing the mixture to penetrate into the canvas and then drying.   The transporting flat belt according to claim 1, wherein the binder includes at least one of urethane resin, rubber latex, and acrylic resin.   The conveying flat belt according to claim 1, wherein the yarn extending in the belt longitudinal direction is a multifilament.   The conveying flat belt according to claim 4, wherein the yarn extending in the belt width direction is a monofilament.   The conveyance according to claim 1, wherein the canvas is coated on at least one surface of a belt main body having a canvas core, and the canvas core has higher tensile rigidity than the canvas at least in a belt longitudinal direction. Flat belt for use.   The other surface of the conveying flat belt is also covered with a canvas, and a mixture containing a binder and a fluororesin is fixed to the surface of each yarn constituting the canvas without being layered. The flat belt for conveyance according to claim 1. A method for producing a transporting flat belt having at least one surface coated with a canvas,
The canvas is composed of a thread extending in the belt longitudinal direction and a thread extending in the belt width direction, and the thread extending in the belt longitudinal direction has elasticity,
After a mixture containing a fluororesin that is a perfluoroalkyl acrylate and a binder for fixing the fluororesin to the surface of each yarn constituting the canvas is permeated into the interior from the surface of the canvas constituting the belt surface. A method of manufacturing a flat belt for conveyance, wherein the mixture is fixed to the surface of each yarn constituting the canvas without being layered by drying.

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