JP2005205780A - Rubber/code composite material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber/cord composite material capable of improving breaking life by suppressing breaking caused in the folded-back part of a reinforcing cord. <P>SOLUTION: The rubber/cord composite material 1 is constituted by spirally winding a rubber-coated reinforcing cord 7 around the surface of an annular rubber core body 4 along the peripheral direction of the core body 4 while folding back the same at the end part 8 in the width direction of the core body 4 and the holded-back part 7a of the rubber-coated reinforcing cord 7 is shaped and deformed so as to correspond to the end part 8 in the width direction of the core body 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rubber-cord composite material used for reinforcing rubber products such as conveyor belts, timing belts, and tires, and a method for manufacturing the same, and more specifically, rubber with improved dimensional accuracy in a folded portion of a reinforcing cord. -It is related with a cord composite material and its manufacturing method.

  Conventionally, as a rubber-cord composite material used for reinforcing rubber products, for example, a reinforcing cord in which a reinforcing cord is embedded in a rubber layer on a surface of an annular core body and covered with rubber is spirally formed along the circumferential direction of the core body. There is a wound belt material for tires. (For example, refer to Patent Document 1).

Such a rubber-cord composite material is usually manufactured by continuously spirally winding a reinforcing cord at the end in the width direction of the core body, but the folded portion wound during winding of the reinforcing cord There is a problem that the positional deviation is likely to occur, and the occurrence of the deviation disturbs the alignment of the folded portions, resulting in a decrease in dimensional accuracy.
JP 60-255504 A

  An object of the present invention is to provide a rubber-cord composite material capable of improving the dimensional accuracy in a folded portion of a reinforcing cord and a method for manufacturing the same.

  The rubber-cord composite material of the present invention that achieves the above-described object is formed in a spiral shape along the circumferential direction of the core body while folding back the reinforcing cord at the end in the width direction of the core body on the surface of the annular rubber core body. In the rubber-cord composite material wound around, the folded portion of the reinforcing cord is molded and deformed so as to correspond to the end portion in the width direction of the core body.

  The method for producing a rubber-cord composite material according to the present invention includes a reinforcing cord wound around a surface of an annular rubber core body in a spiral shape along the circumferential direction of the core body while being folded back at the widthwise end portion. In the rubber-cord composite material manufacturing method for manufacturing a rubber-cord composite material, the reinforcing cord has a molded portion obtained by forming and deforming the folded portion so as to correspond to the end portion in the width direction of the core body. And the reinforcing cord is wound around the surface of the core body such that the shaping portion is folded back at the end in the width direction of the core body.

  According to the present invention described above, the folded portion of the reinforcing cord is molded and deformed so as to correspond to the widthwise end portion of the core body to be folded, so that the position of the wound folded portion can be suppressed and the folded portion can be easily formed. Therefore, it is possible to improve the dimensional accuracy in the folded portion of the reinforcing cord wound around the core body.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show an embodiment of a rubber-cord composite material according to the present invention. The rubber-cord composite material 1 is formed in an annular shape, and a reinforcing cord 2 wound at approximately 0 ° in the circumferential direction is unvulcanized. A rubber-coated reinforcing cord 7 in which a reinforcing cord 6 is covered with unvulcanized rubber 5 is applied to the entire surface of a rectangular plate-shaped annular core (rubber core) 4 covered with rubber 3 at both ends in the width direction of the core 4. It has a structure in which it is wound spirally along the circumferential direction of the core body 4 while being folded back at the portion 8. The rubber-covered reinforcing cord 7 is formed in a molding portion that is subjected to molding deformation so that the folded portion 7 a corresponds to the width direction end portion 8 of the core body 4.

  3 to 5 show an example of the typed structure of the folded portion 7a. In this example, it is an S-shaped curve in a side view shown in FIG. 4 and an arc-shaped curve in a cross-sectional view shown in FIG. 5, and the width direction end portion 8 of the core body 4 is shown in FIG. The end portions 8a, the outer peripheral surface 9, and the portions 7a, 7b, 7c of the rubber-covered reinforcing cord 7 positioned on the inner peripheral surface 10 are expanded so as to be positioned on the same plane (deployed along the rubber-coated reinforcing cord 7). When this is done, the rubber-coated reinforcing cord 7 extends linearly along the same direction. In the figure, E1 is an edge where the outer peripheral side surface 9 of the core body 4 is in contact with the end face 8a of the width direction end 8, and E2 is an edge where the inner peripheral side surface 10 and the end face 8a of the width direction end 8 are in contact.

  In addition, the linear shape said here is the inclination angle with respect to the core body circumferential direction of the folding | returning part 7a located in the end surface 8a of the width direction edge part 8 of the rubber | gum covering reinforcement cord 7 at the time of expansion | deployment, and the outer peripheral side surface 9 ( Alternatively, if the inclination angle of the portion 7b (or the portion 7c) located on the inner peripheral surface 10) with respect to the circumferential direction of the core is β, the relationship between the inclination angle α and the inclination angle β is β−0.05β <α <β + 0. .05β. This is a tolerance taking into account the variation in angular difference in industrial production, and a case where it is within this tolerance is defined as a straight line.

  7 and 8 show other examples of the typed structure of the folded portion 7a. In this example, it is formed in a V shape in a front view of FIG. 7 and a cross sectional view of FIG. 8 and is shaped into a V shape that changes three-dimensionally. A U-shape may be used instead of the V-shape.

  9 to 13 show still another example of the typed structure of the folded portion 7a. In these examples, the folded portion 7a has two bending points A and B that are bent at the edges E1 and E2, and is molded into a shape that changes three-dimensionally.

  9 and 10 are curves in the shape of FIG. 9 when the folded portion 7a having two bending points A and B is developed so as to be positioned on the same plane, and further when viewed from the side (core body) of FIG. 4 in a state of projection in the width direction 4), and the shape is deformed so as to be a straight line.

  11 and 12, both the shape of FIG. 11 when the folded portion 7a having two bending points A and B is developed so as to be positioned on the same plane and the shape in a side view of FIG. 12 are curved. The type is deformed.

  In FIG. 13, the folded portion 7 a having two bending points A and B is formed and deformed so as to be bent at right angles at the bending points A and B along the surface of the core body 4.

  Hereinafter, a method for producing the rubber-cord composite material 1 described above will be described with reference to FIGS. In FIGS. 14 and 15, reference numeral 11 denotes a turntable in which the inner peripheral side is formed in the passage 12 of the core body 4 and a slit 13 communicating with the passage 12 is provided at one place. , Four bobbins 14 are arranged at predetermined intervals. Each bobbin 14 is wound with a rubber-covered reinforcing cord 7 formed on a molding portion obtained by molding and deforming the folded portion 7a so as to correspond to the end portion 8 in the width direction. The rubber-covered reinforcing cord 7 having this mold-attached portion is formed by coating a pre-molded reinforcing cord 6 with the unvulcanized rubber 5.

  The rubber-covered reinforcing cord 7 is pulled out from the bobbin 14 through a first guide 15 disposed above the bobbin 14 and a second guide 16 disposed above the inner peripheral side of the turntable 11. Reference numeral 17 denotes four rollers that wrap around the core body 4 and are arranged in an annular shape at a predetermined interval. One roller 17 is rotated by a drive motor (not shown), whereby the core body 4 wound around the roller 17 is moved around the circumference thereof as indicated by arrows.

  In order to manufacture the rubber-cord composite material 1, first, the core body 4 is disposed in the passage 12 through the slit 13 and is wound around the roller 17. Next, the rubber-covered reinforcing cord 7 is pulled out from the bobbin 14 and its tip is attached to the surface of the core body 4 at a predetermined interval, and then the core body 4 is moved around and the turntable 11 is rotated.

  At that time, the speed at which the core body 4 moves around and the speed at which the turntable 11 rotates is controlled so that the rubber-covered reinforcing cord 7 is folded back at the end 8 in the width direction of the core body 4. It is wound around the surface of the core body 4. In this way, the rubber-coated reinforcing cord 7 is wound around the entire surface of the core body 4 to obtain the rubber-cord composite material 1 described above.

  The folded portion 7a of the rubber-covered reinforcing cord 7 is not molded in advance as described above, but immediately after the uncoated rubber-coated reinforcing cord 7 is wound around the surface of the core body 4, it is sequentially molded by a molding device. Also good.

  According to the present invention described above, the folded-back portion 7a wound by forming and deforming the folded portion 7a of the rubber-coated reinforcing cord 7 of the rubber-cord composite material 1 so as to correspond to the end portion 8 in the width direction of the core body 4. Since it is difficult to shift the position, the disorder of the alignment of the folded portion 7a is suppressed, and the dimensional accuracy in the folded portion 7a can be improved.

  In the present invention, the core 4 may be formed by spirally winding a single reinforcing cord 2 coated with rubber, or a strip material in which a plurality of aligned reinforcing cords 2 are covered with rubber. It is also possible to adopt a configuration in which the material is spirally wound into a ring shape.

  In addition, the core body 4 is formed by replacing the rubber core body in which the above-described reinforcing cord 2 is covered with the unvulcanized rubber 3, or an annular rubber core body made of only the unvulcanized rubber 3 or a woven fabric. An annular rubber core coated with rubber may be used.

  When the folded portion 7a of the rubber-covered reinforcing cord 7 is folded away from the end face 8a of the core body 4 as shown in the drawing, the separation distance k is less than or equal to ½ of the thickness t of the core body 4. It is good to fold it back (see FIG. 8).

  In the above-described embodiment, the rubber-cord composite material 1 in which the rubber-coated reinforcing cord 7 is wound around the core body 4 is illustrated. However, the reinforcing cord 6 without the rubber coating is wound around the core body 4 as described above. It may be a rubber-cord composite material.

  In the above embodiment, an example in which four rubber-coated reinforcing cords 7 are wound at the same time has been shown, but only one rubber-coated reinforcing cord 7 is wound around the core body 4 to form the rubber-cord composite material 1. Alternatively, the number of the rubber-covered reinforcing cords 7 to be wound may be one or plural, and can be appropriately selected.

  The reinforcement cord 6 is a metal cord such as a steel cord, and the reinforcement cord 2 of the core body 4 is a metal cord such as a steel cord, or an organic fiber cord such as aromatic polyamide, polyethylene terephthalate, polyethylene naphthalate, or nylon. Can be mentioned.

  The present invention can be suitably used as a rubber-cord composite material used for reinforcing rubber products such as conveyor belts, timing belts, and tires.

It is a perspective view which shows one Embodiment of the rubber cord composite material of this invention. It is an expanded sectional view of FIG. It is plane explanatory drawing which shows the folding | turning part of a rubber covering reinforcement cord. FIG. 4 is a side view of FIG. 3. It is XX arrow sectional drawing of FIG. FIG. 4 is a development view of FIG. 3. It is plane explanatory drawing which shows the other example of the folding | turning part of a rubber covering reinforcement cord. It is sectional drawing seen from the arrow Y direction of FIG. FIG. 7 is a development explanatory view corresponding to FIG. 6 showing still another example of the folded portion of the rubber-coated reinforcing cord. It is side surface explanatory drawing of the folding | turning part of the rubber-coated reinforcement cord of FIG. FIG. 7 is a development explanatory view corresponding to FIG. 6 showing still another example of the folded portion of the rubber-coated reinforcing cord. It is side surface explanatory drawing of the folding | turning part of the rubber-coated reinforcement cord of FIG. FIG. 10 is a cross-sectional explanatory view corresponding to FIG. 5 showing still another example of the folded portion of the rubber-coated reinforcing cord. It is plane explanatory drawing which shows an example of the apparatus used for the manufacturing method of the rubber cord composite material of this invention. It is front explanatory drawing of FIG.

Explanation of symbols

1 Rubber / Cord Composite 2 Reinforcement Cord 3 Unvulcanized Rubber 4 Core (Rubber Core)
5 Unvulcanized rubber 6 Reinforcement cord 7 Rubber covered reinforcement cord 7a Folded portion 7b, 7c portion 8 Width direction both ends 8a End surface 9 Outer peripheral surface
10 Inner surface A, B Bending point E1, E2 Edge α, β Inclination angle

Claims (8)

  A rubber-cord composite material in which a reinforcing cord is wound around the surface of an annular rubber core body in a spiral shape along the circumferential direction of the core body while being folded back at the end in the width direction of the core body. A rubber-cord composite material in which a portion is shaped and deformed so as to correspond to an end in the width direction of the core.   When the end portions of the end portions in the width direction of the core body, the outer peripheral surface, and the rubber-covered reinforcing cord portions located on the inner peripheral surface are deployed so as to be positioned on the same plane, the reinforcing cord is linear. The rubber-cord composite material according to claim 1, wherein the folded portion of the reinforcing cord is formed and deformed so as to extend.   The rubber-cord composite material according to claim 1, wherein the folded portion of the reinforcing cord is formed into a three-dimensionally changing V-shape or U-shape.   2 bending points at which the folded portion of the reinforcing cord is bent at the edge where the outer peripheral surface of the core body is in contact with the end surface in the width direction and the edge where the inner surface of the core body is in contact with the end surface in the width direction. The rubber-cord composite material according to claim 1, wherein the rubber-cord composite material is molded into a shape that changes three-dimensionally.   The rubber according to claim 4, wherein a shape when the folded portion of the reinforcing cord is deployed so as to be positioned on the same plane is a curve, and a shape when projected in the width direction of the core is a straight line. Cord composite material.   The rubber / cord composite material according to claim 4, wherein a shape when the folded portion of the reinforcing cord is deployed so as to be positioned on the same plane and a shape when projected in the width direction of the core body are both curved. .   The rubber-cord composite material according to claim 4, wherein the core body is formed in a rectangular cross section, and a folded portion of the reinforcing cord is bent at a right angle along the surface of the core body. A rubber-cord composite that manufactures a rubber-cord composite by spirally winding a reinforcing cord on the surface of an annular rubber core along the circumferential direction of the core while folding the reinforcing cord back at the widthwise end of the core In the method for manufacturing a material, a reinforcing cord having a molding portion in which a folded portion is molded and deformed so as to correspond to an end portion in the width direction of the core body is used as the reinforcing cord, and the reinforcing cord is used as the reinforcing cord. A method for producing a rubber-cord composite material that is wound around the surface of the core body so as to be folded at the widthwise end of the core body.

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