JP2009242007A - Flat belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance adhesive strength of a conductor and a resin film in a core body layer, without reducing strength in the longitudinal direction of a belt. <P>SOLUTION: This flat belt 10 has the core body layer 20, first and second canvases 21 and 22 respectively laminated on and adhered to an upper surface and a lower surface of the core body layer 20, and first and second surface rubber layers 23 and 24 laminated on and adhered to the respective upper surface and lower surface of the first and second canvases 21 and 22. The core body layer 20 is constituted by embedding a large number of untwisted filaments 25 inside a resin film 26. The untwisted filaments 25 extend in the longitudinal direction, and are arranged at random in a cross section of the belt. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a flat belt used in a conveying device or a power transmission device.

  2. Description of the Related Art Conventionally, a flat belt is known which is made of an elastomer, and has a canvas bonded to both sides of an intermediate layer in which a core wire is embedded, and a rubber or thermoplastic elastomer surface layer laminated on the outer surface of the canvas ( Patent Document 1). In this flat belt, the core wire is composed of a non-stretchable and high-strength stranded wire, and those extending in the longitudinal direction are arranged in a row in the width direction, and the tensile strength of the belt in the longitudinal direction is , Secured by the core.

The flat belt is used by being shaped into an endless shape by joining both ends of a belt-like flat belt by a so-called finger joint. In the finger joint, both end portions of the finger-shaped belt are butted, and the butted portion is pressurized and heated to melt the intermediate layer, and the melted intermediate layer joins both end portions to form an endless belt. Molded.
JP 2001-153186 A

  However, the flat belt has a relatively large-diameter stranded wire embedded in the intermediate layer, so that the bonding area between the core wire and the elastomer of the intermediate layer becomes smaller relative to the diameter, There is a problem that interfacial peeling between the elastomer is likely to occur. In particular, in the flat belt of Patent Document 1, since the core wires are arranged in a line to form a layer, the adhesive strength between the core wire layer and the elastomer tends to be lowered, and delamination occurs between them. Is likely to occur. Further, when the core wires arranged in one row are jointed, the arrangement positions thereof are disturbed by flowing together with the molten elastomer, and the belt tension may become non-uniform.

  Therefore, the present invention has been made in view of these problems, and while making the tensile strength in the longitudinal direction of the belt sufficiently high, the interfacial peeling of the core wire in the intermediate layer is made difficult to occur, and a finger joint is further performed. However, an object of the present invention is to provide a flat belt in which the position of the core wire is hardly disturbed in the joint portion.

  The flat belt according to the present invention includes a core layer in which a plurality of untwisted filaments extending in the longitudinal direction of the belt are embedded in a resin film. At this time, it is preferable that the untwisted filaments are randomly arranged in the cross section of the belt.

  The resin film is, for example, a polyamide resin film or a urethane resin film. Canvas may be laminated on both sides of the core layer. A surface rubber layer may be further laminated on at least one outer side of the canvas. The untwisted filament is formed of, for example, an aramid fiber.

  In the flat belt, for example, the core layer is melted by heating and pressurizing in a state where the end faces of both ends of the flat belt formed in a band shape are abutted, and the melted core layer Thus, both ends are fused to form an endless shape.

  Further, for example, after an adhesive is applied to at least one of the end faces of both ends of the flat belt formed in a belt shape, the end faces are abutted with each other, and the end faces are bonded to each other with the adhesive to form an endless shape.

  In the present invention, by using a non-twisted filament as the core wire, it is possible to make it difficult to cause peeling between the core wire and the resin film in the intermediate layer while sufficiently increasing the tensile strength in the longitudinal direction of the belt. . Moreover, since the core wire is not formed into a layer by arranging the untwisted filaments randomly in the cross section, it is possible to more effectively prevent the core wire from being peeled at the intermediate layer. Furthermore, even in a belt in which both end portions of the belt are melted and joined, it is easy to evenly arrange the core wires embedded in the core body layer in the joint portion.

Hereinafter, the present invention will be specifically described with reference to the drawings.
FIG. 1 is a cross-sectional view of a flat belt for illustrating an embodiment of the present invention. In the following description, the lower side in FIG. 1 is described as the lower surface side, and the upper side is described as the upper surface side.

  The flat belt 10 is an endless belt and is used for conveyance, for example. The flat belt 10 is provided at a central portion in the belt thickness direction, and a core body layer 20 that extends over the entire length of the belt, and first and second canvases 21 that are laminated and bonded to the upper surface and the lower surface of the core body layer 20, respectively. , 22 and first and second surface rubber layers 23, 24 that are laminated and bonded to the upper and lower surfaces of the first and second canvases 21, 22, respectively.

  The core layer 20 is configured by an infinite number of untwisted filaments 25 embedded in a resin film 26. As the resin film 26, a thermoplastic resin such as a urethane resin film or a polyamide resin film is preferably used. The infinite number of untwisted filaments 25 extend along the longitudinal direction of the belt, and are randomly arranged over the entire core layer 20 in the cross section of the belt as shown in FIG. The untwisted filament 25 in this embodiment plays a role as a tensile member of the belt 10.

  A polyamide resin film is particularly preferably used as the resin film 26. Since the polyamide resin film has a relatively high melting point and is highly rigid in the belt longitudinal direction and the width direction, the belt can be reinforced not only in the longitudinal direction but also in the width direction. For example, the flange resistance of the belt can be enhanced. .

  The untwisted filament 25 is formed of a high-strength polyester fiber or an aramid fiber, but an aramid fiber having higher rigidity is preferably used. The untwisted filament 25 is a bundle of monofilaments or a plurality of filaments and is not twisted.

  The first and second canvases 21 and 22 are stretchable in the longitudinal direction of the belt and substantially non-stretchable in the width direction. In the present embodiment, by using a canvas that expands and contracts in the longitudinal direction, the stretchability in the longitudinal direction of the belt can be improved. The first and second canvases 21 and 22 extend, for example, in the longitudinal direction of the belt and extend in the width direction of the belt, and the first yarn (for example, warp) that is a stretchable yarn, and the non-stretchable yarn. Is a woven fabric woven with a second thread (for example, weft). The first and second canvases 21 and 22 are woven with, for example, polyamide fiber yarns.

  The first and second surface rubber layers 23 are rubber layers formed from nitrile rubber or the like. The upper surface of the first surface rubber layer 23 is, for example, the outer peripheral surface of the belt and serves as a conveyance surface for conveying the object to be conveyed. On the upper surface of the first surface rubber layer 23, perforations which are irregularities regularly arranged so as to have a predetermined coefficient of friction are formed. The lower surface of the second surface rubber layer 24 is, for example, an inner peripheral surface of the belt, and is a surface that comes into contact with the pulley when it is wound around the pulley. Note that the lower surface of the second surface rubber layer 24 is formed with perforations that are regularly arranged, and can be used as a conveying surface.

  The flat belt 10 according to this embodiment is manufactured by a method as described below, for example. In the present embodiment, first, the melted resin is extruded and supplied to the untwisted filaments 25 arranged in such a way as to extend in one direction and be random in a vertical plane in the one direction. And the untwisted filament 25 is embed | buried in the inside of the supplied resin, and resin is solidified, and the core layer 20 is shape | molded. Thereafter, the first and second canvases 21 and 22 and the first and second surface rubber layers 23 and 24 are laminated and bonded to both surfaces of the core layer 20 to obtain the belt-like belt 10.

  As shown in FIG. 2, both end portions 10 </ b> A and 10 </ b> B in the belt-like belt 10 are appropriately cut and processed into fingers. Specifically, the one end portion 10A has a shape in which the isosceles triangular convex portions 13 protruding in the longitudinal direction of the belt are continuously arranged in the width direction. The other end 10 </ b> B has a shape in which a plurality of recesses 14 having the same shape complementarily to the protrusion 13 are continuously arranged in the belt width direction, and is processed into a complementary finger shape at the one end 21. Is done. Both end portions 10 </ b> A and 10 </ b> B are brought into contact with each other by fitting the respective convex portions 13 into the respective concave portions 14. The both end portions 10A and 10B with which the end faces are abutted are heated and pressed in the thickness direction of the belt, the resin film 26 is melted, and both end portions 10A and 10B are melted by the melted resin film 26. And an endless belt is obtained.

  As described above, in this embodiment, a non-twisted filament having a smaller diameter than that of the twisted yarn is used as the core wire. Therefore, the bonding area between the core wire and the resin film is increased relative to the diameter. Therefore, interface peeling between the core wire and the resin film hardly occurs, and a highly durable belt can be provided.

  The untwisted filaments do not form a row and are randomly arranged in the cross section. Therefore, since the untwisted filament can be densely embedded throughout the core layer, the tensile strength in the longitudinal direction of the belt can be sufficiently increased even if the thickness of the core layer is reduced. Furthermore, when performing finger joints, even if the resin is melted and the untwisted filaments flow in accordance with the flow of the resin, the random arrangement of the untwisted filaments is maintained, so the belt tension may become uneven. Is prevented.

  In this embodiment, the convex part 13 is not limited to an isosceles triangle, and may be formed in a rectangle or other triangles.

  Moreover, in this embodiment, after applying an adhesive to one or both of the end faces of both end portions 10A and 10B, the end faces are brought into contact with each other, whereby the end faces are bonded to each other by the adhesive. Both end portions 10A and 10B may be joined together. In this case, when both end surfaces are bonded, the abutted portions are pressed in the width direction, but heating is not required, so the resin film 25 of the core body layer 20 is not melted.

  Moreover, both ends 10A and 10B may be joined by a sky bar joint. Specifically, the end surfaces of both end portions 10A and 10B of the belt are formed as complementary tapered surfaces, and after one or both tapered surfaces are coated with an adhesive, the tapered surfaces are bonded to each other by the adhesive. Thus, both end portions 10A and 10B are joined together. When both ends are joined by a sky bar joint, both ends 10A and 10B are pressurized and heated in the thickness direction, but the resin film of the core layer 20 is not melted by this heating.

  Note that these methods in which both end portions 10A and 10B are bonded by an adhesive without being melted are suitable when the resin film 26 is a polyamide resin film. This is because the polyamide resin film has a high melting point.

It is a cross-sectional view of a flat belt according to the present invention. It is a perspective view which shows the both ends of the flat belt before joining in endless form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flat belt 20 Core body layer 21, 22 1st and 2nd canvas 23, 24 1st and 2nd surface rubber layer 25 Untwisted filament 26 Resin film

Claims (8)

  A flat belt comprising a core layer in which a plurality of untwisted filaments extending in the longitudinal direction of the belt are embedded in a resin film.   The flat belt according to claim 1, wherein the non-twisted filaments are randomly arranged in a cross section of the belt.   The flat belt according to claim 1, wherein the resin film is a polyamide resin film or a urethane resin film.   The flat belt according to claim 1, wherein canvases are respectively laminated on both sides of the core layer.   The flat belt according to claim 4, wherein a surface rubber layer is further laminated on at least one outer side of the canvas.   The flat belt according to claim 1, wherein the untwisted filament is formed of an aramid fiber.   The core layer is melted by heating and pressurizing in a state where the end faces of both ends of the flat belt formed into a band are abutted, and the both ends are melted by the melted core layer. The flat belt according to claim 1, wherein the flat belt is formed to be endless.   After the adhesive is applied to at least one of the end faces of the both ends of the flat belt formed in a band shape, the end faces are abutted with each other, and the end faces are bonded to each other by the adhesive to form an endless shape. The flat belt according to claim 1.

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