JP2018199536A - Conveyor belt and method of manufacturing conveyor belt - Google Patents

Abstract

To Provide a conveyor belt having improved adhesion between a core body and a cover rubber.SOLUTION: In a conveyor belt having a plurality of core bodies arranged in the belt width direction and extending in the belt longitudinal direction, a cover rubber enclosing the core body, and adhesive rubber bonding the core body and the cover rubber, the interface line between the cover rubber and the adhesive rubber in a cross-sectional view in the belt width direction of the conveyor belt is formed in an uneven shape which is a convex toward the outside of the belt at the belt width direction arrangement position of the core body, and is a concave so as to be directed toward the inside of the belt at the belt width direction non-arrangement position of the core body, and a straight line passing through the center of the core body and extending perpendicularly to the outer surface of the cover rubber, when the straight line passing through the center of the core body and extending obliquely at an angle of 45° with respect to the base line is defined as a first inclined line, a thickness of the adhesive rubber on the first inclined line is larger than the thickness of the adhesive rubber on the base line.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a conveyor belt and a method for manufacturing the conveyor belt.

  Conventionally, in a conveyor belt, an adhesive rubber is disposed between a core body and a cover rubber that encloses the core body, and the core body and the cover rubber are bonded to each other. It is demanded to improve.

  For example, Patent Document 1 discloses a technique for improving heat-resistant adhesion between a cover rubber and a steel cord by using an adhesive rubber made of a predetermined rubber composition.

JP 2001-335667 A

  However, when there is a high demand for adhesiveness between the core and the cover rubber, for example, when using a conveyor belt, there is a pulling force that acts on the core and a peeling force that acts between the core and the adhesive rubber. There is a need to improve the adhesion between the core body and the cover rubber when it is excessive.

Then, an object of this invention is to provide the conveyor belt which improved the adhesiveness of a core and cover rubber | gum.
Another object of the present invention is to provide a method for manufacturing a conveyor belt that can provide a conveyor belt with improved adhesion between the core and the cover rubber.

(1) A conveyor belt according to the present invention is formed by bonding a plurality of cores arranged in the belt longitudinal direction and extending in the belt longitudinal direction, a cover rubber including the cores, and the core and the cover rubber. An adhesive rubber, wherein the interface line between the cover rubber and the adhesive rubber is a belt at a position in the belt width direction of the core in a belt width direction sectional view of the conveyor belt. Convex shape that is convex outward and concave toward the belt inward in the belt width direction disposition position of the core body, passes through the center of the core body, When a straight line extending perpendicularly to the outer surface is a base line, and a straight line extending through the center of the core body and inclined at an angle of 45 ° with respect to the base line is a first inclined line, the first inclined line The thickness of the adhesive rubber in the base line Wherein the thicker than the thickness of the definitive said adhesive rubber. According to the conveyor belt of this invention, the conveyor belt which improved the adhesiveness of a core and cover rubber can be provided.

In the present specification, the longitudinal direction of the conveyor belt and the direction parallel to the running direction of the conveyor belt is referred to as “belt longitudinal direction”. A direction perpendicular to the belt longitudinal direction is referred to as a “belt width direction”.
In the present specification, when the core body has an irregular shape, the center of the circumscribed circle that is the smallest of the circumscribed circles of the core body is defined as the center of the core body.

(2) In the conveyor belt of the present invention, when the straight line extending through the center of the core body and inclined at an angle of 30 ° with respect to the base line is defined as the second inclined line, the adhesion on the second inclined line The rubber is preferably thicker than the adhesive rubber on the base line. According to this configuration, the adhesion between the core body and the cover rubber can be further improved.

(3) In the conveyor belt of the present invention, the thickness of the adhesive rubber on all the inclined lines extending through the center of the core body and inclined with respect to the base line is greater than the thickness of the adhesive rubber on the base line. It is also preferable that the thickness is thick. According to this configuration, the adhesion between the core body and the cover rubber can be further improved.

(4) In the conveyor belt of this invention, it is preferable that the thickness of the said adhesive rubber in the belt width direction non-arrangement position of the said core is thicker than the thickness of this adhesive rubber on the said base line. According to this configuration, the adhesion between the core body and the cover rubber can be further improved.
Here, “the thickness of the adhesive rubber at the position where the core body is not disposed” refers to a minimum value measured in a direction perpendicular to the belt width direction in a sectional view in the belt width direction.

(5) In the conveyor belt of this invention, it is preferable that the thickness along the belt width direction of the said adhesive rubber between the said adjacent core bodies is thicker than the thickness of this adhesive rubber on the said base line. According to this structure, the adhesiveness of the core of a conveyor belt and cover rubber can further be improved.
The “thickness of the adhesive rubber along the belt width direction between adjacent cores” here refers to the minimum value measured in a direction parallel to the belt width direction in a cross-sectional view in the belt width direction. .

(6) A method for manufacturing a conveyor belt according to the present invention includes a plurality of cores, a cover rubber having an upper cover rubber and a lower cover rubber, and an adhesive rubber that bonds the core and the cover rubber. An upper adhesive rubber and a lower adhesive rubber, and at least one of the upper adhesive rubber and the lower adhesive rubber is a convex portion that extends continuously in the belt longitudinal direction on a sheet-like portion extending in a sheet shape. Using a plurality of adhesive rubbers that are arranged at intervals in the belt width direction,
Laminating the lower cover rubber, the lower adhesive rubber, the core, the upper adhesive rubber, and the upper cover rubber in this order,
The upper adhesive rubber and / or the lower adhesive rubber is formed so that the sheet-like portion is positioned on the core body side, and a conveyor belt is formed. According to the method for manufacturing a conveyor belt of the present invention, it is possible to obtain a conveyor belt with improved adhesion between the core body and the cover rubber.

  ADVANTAGE OF THE INVENTION According to this invention, the conveyor belt which improved the adhesiveness of a core and cover rubber can be provided. Furthermore, the manufacturing method of a conveyor belt which can obtain the conveyor belt which improved the adhesiveness of a core and cover rubber can be provided.

(A) is belt width direction sectional drawing which shows a part of belt width direction of the conveyor belt based on one Embodiment of this invention, (b) shows the core vicinity of FIG. 1 (a). It is a partial expanded sectional view. It is a figure explaining the manufacturing method of the conveyor belt based on one Embodiment of this invention. (A) is belt width direction sectional drawing which shows a part of belt width direction of the conventional conveyor belt, (b) is a partial expanded sectional view which shows the core vicinity of FIG. 3 (a).

Hereinafter, embodiments of a conveyor belt and a method for manufacturing a conveyor belt according to the present invention will be described with reference to the drawings.
Fig.1 (a) is sectional drawing which shows a part of belt width direction of the conveyor belt 10 which concerns on one Embodiment of this invention. In the conveyor belt 10, the illustrated configuration is continuous over the belt width direction of the conveyor belt 10. The conveyor belt 10 includes a plurality of cores (steel cords in the present embodiment) 1 that are arranged in the belt width direction at regular intervals in the present embodiment and extend in the belt longitudinal direction, and the cores 1. A cover rubber 2 that encloses the core body 1 and an adhesive rubber 3 that bonds the core 1 and the cover rubber 2 to each other. In this embodiment, the cover rubber 2 includes an upper cover rubber 2A that covers the upper surface (upper side in the drawing) of the core body 1 and a lower cover rubber that covers the lower surface (lower side in the drawing) of the core body 1. 2B, and the upper cover rubber 2A and the lower cover rubber 2B are bonded to each other at the end in the belt width direction of the conveyor belt 10 via the adhesive rubber 3 or without the adhesive rubber 3. . Further, in the present embodiment, the adhesive rubber 3 continuously extends in the belt width direction without being interrupted between the cores 1 adjacent in the belt width direction.
In the present embodiment, the interface line F1 between the upper cover rubber 2A and the adhesive rubber 3 and the interface line F2 between the lower cover rubber 2B and the adhesive rubber 3 are the belt of the core body 1 in the belt width direction sectional view. It is convex in the width direction arrangement position (hereinafter also referred to simply as “positioning position of the core body 1”) and protrudes outward from the belt, and the core body 1 is not disposed in the belt width direction (hereinafter simply referred to as “core position”). It is also referred to as “the non-arrangement position of the body 1”) and extends in a concave-convex shape that is concave so as to face inward of the belt. More specifically, the interface lines F1 and F2 in the present embodiment extend in a gentle wave shape that smoothly connects a plurality of arcs in the belt width direction. Both of the boundary lines F1 and F2 are overlapped with a line extending in the belt width direction through the center of the core body 1 in the thickness direction center line of the conveyor belt (not shown. In the non-arranged position of the core body 1, it extends in a gentle wave shape across the belt width direction so as to be closest to the center line. Thus, the boundary lines F1 and F2 extend in a substantially sine wave shape shifted by a half cycle in the belt width direction. In the present embodiment, the minimum radius of curvature of the arc that forms the boundary lines F1 and F2 at the position where the core body 1 is disposed is the arc that forms the boundary lines F1 and F2 when the core body 1 is not disposed. Is smaller than the radius of curvature. However, the minimum curvature radius of the arc that forms the boundary lines F1 and F2 at the arrangement position of the core body 1 according to various conditions such as the diameter of the core body 1 and the arrangement pitch of the core body 1 in the belt width direction. Can be larger than the minimum radius of curvature of the arc forming the boundary lines F1, F2 at the position where the core body 1 is not disposed.

The interface lines F1 and F2 will be described in more detail with reference to FIG. FIG. 1B is a partially enlarged cross-sectional view showing the vicinity of any one core body 1 shown in FIG. As described above, the interface line F1 between the upper cover rubber 2A and the upper adhesive rubber 3A and the interface line F2 between the lower cover rubber 2B and the lower adhesive rubber 3B are the positions where the core body 1 is disposed, It extends toward the belt 1 at a non-arrangement position of the core body 1 so as to form a gentle wave shape that is concave toward the inside of the belt. Further, the thickness of the adhesive rubber 3 in the present embodiment is the minimum directly above and below the core body 1. That is, the adhesive rubber 3 is located at a position where the distance between the core body 1 and the outer surface 2As of the upper cover rubber 2A and / or the distance between the core body 1 and the outer surface 2Bs of the lower cover rubber 2B is the shortest. , Have the smallest thickness. In particular, a straight line passing through the center of the core body 1 and perpendicularly to the outer surface 2As of the upper cover rubber and / or the outer surface 2Bs of the lower cover rubber through the center of the core body 1 is a base line. The thickness of the adhesive rubber 3 on the first inclined line L1 is L, and the straight line extending through the center of the core body 1 and inclined at an angle of 45 ° with respect to the base line L is defined as the first inclined line L1. The thickness T1 is thicker than the thickness T of the adhesive rubber 3 on the base line L. Furthermore, when a straight line that extends through the center of the core body 1 at an angle of 30 ° with respect to the base line L is defined as the second inclined line L2, the thickness T2 of the adhesive rubber 3 on the second inclined line L2 Is thicker than the thickness T of the adhesive rubber 3 on the base line L.
In the present embodiment, the thickness of the adhesive rubber 3 on all straight lines passing through the center of the core body 1 and the point between the first inclined line L1 and the second inclined line L2 is on the base line L. It is thicker than the thickness T of the adhesive rubber 3 in FIG.
In addition, between the first inclined line L1 on the upper side of the core body 1 and the first inclined line L1 on the lower side, which is illustrated, the center of the core body 1, the first inclined line L1 on the upper side and the lower side. The thickness of the adhesive rubber 3 on all straight lines passing through the point between the first inclined line L1 on the side is thicker than the thickness T1 of the adhesive rubber 3 on the first inclined line L1.
Further, in the present embodiment, the thickness of the adhesive rubber 3 on all the inclined lines extending through the center of the core body 1 and inclined with respect to the base line L is larger than the thickness of the adhesive rubber 3 on the base line L.

Further, in the present embodiment, the thickness T 3 of the adhesive rubber 3 at the position where the core body 1 is not disposed is smaller than the diameter D of the core body 1. However, in other embodiments, the thickness T3 of the adhesive rubber 3 is the diameter D of the core body 1, the thickness T of the adhesive rubber on the upper base line L of the core body 1, and the lower side of the core body 1. As long as it is smaller than the sum of the thickness T of the adhesive rubber 3 on the base line L (that is, T3 <D + T × 2), it can be made larger than the diameter D of the core body 1.
Although the thickness of the adhesive rubber 3 on the side surface on one side (right side in the figure) of the core body 1 has been described above, in the present embodiment, the other side of the core body 1 is illustrated as illustrated. The thickness of the adhesive rubber 3 on the side surface (on the left side in the figure) also satisfies the above relationship.

  In the present embodiment, a steel cord made by twisting or bundling a plurality of steel filaments is used for the core body 1, but a cord made of one filament can also be used. Further, as a material of the cord, other materials such as aramid fiber can be used as well as steel.

Further, as the cover rubber 2, polymers such as NR, IR, SBR, BR, CR, IIR, NBR, EPDM, reinforcing carbon, anti-aging agent, vulcanizing agent, vulcanization accelerator, and / or resin addition A rubber combined with an agent or the like can also be used.
The adhesive rubber 3 includes polymers such as NR and SBR, reinforcing carbon, anti-aging agents, softeners, vulcanizing agents, vulcanization accelerators, and / or organic metal salts such as Co, Cu, and Pb. Can be used.

Next, with reference to FIG. 2, the manufacturing method of the conveyor belt which concerns on one Embodiment of this invention which can be used suitably as a manufacturing method of the conveyor belt 10 mentioned above is demonstrated.
FIG. 2 is a cross-sectional view in the belt width direction showing a state before forming the conveyor belt 10 according to the present embodiment. In manufacturing the conveyor belt 10 of the present embodiment, a plurality of core bodies (in this embodiment, steel cords) 1 extending in the belt longitudinal direction and a cover rubber 2 (in this embodiment) containing the core bodies 1 are included. An upper covergo 2A that covers the core body 1 from the upper side (upper side in the figure, and a lower cover rubber 2B that covers the core body 1 from the lower side (lower side in the figure)), the core body 1 and the cover rubber 2 and an adhesive rubber 3 that bonds the core body 1 and the cover rubber 2 (in this embodiment, an upper adhesive rubber 3A that covers the core body 1 from the upper side (the upper side in the figure), and the core body. 1 is used to cover 1 from the lower side (lower side in the figure).
As shown in the drawing, the upper adhesive rubber 3A and the lower adhesive rubber 3B are respectively formed into sheet-like portions 3As and 3Bs extending in a sheet shape in the longitudinal direction and the width direction, and the sheet-like portions 3As and 3Bs. And a plurality of convex portions 3Ap and 3Bp. The protrusions 3Ap and 3Bp extend continuously in the longitudinal direction. In the present embodiment, the protrusions 3Ap and 3Bp are each a protrusion having a rectangular shape having a long side in the width direction, and the width on the sheet-like parts 3As and 3Bs. In the direction, in this embodiment, they are arranged at a certain interval. Thus, each of the upper adhesive rubber 3A and the lower adhesive rubber 3B is a smooth and flat surface on one side, and the other surface is spaced in the width direction (in this embodiment, at a constant interval). ) An uneven surface in which the arranged convex portions 3Ap and 3Bp are continuous in the longitudinal direction. In this embodiment, both the upper adhesive rubber 3A and the lower adhesive rubber 3B have the above-described sheet-like portions 3As and 3Bs and the convex portions 3Ap and 3Bp, but the upper adhesive rubber 3A or the lower side Either one of the adhesive rubbers 3B can be configured only from the sheet-like portions 3As and 3Bs.

  In this embodiment, when the conveyor belt 10 is formed, for example, the lower cover rubber 2B, the lower adhesive rubber 3B, the core body 1, the upper adhesive rubber 3A, and the upper cover rubber 2A are laminated in this order. More specifically, first, the lower adhesive rubber 3B is overlaid on the lower cover rubber 2B, and then the core material 1 is spaced at a desired interval in the belt width direction (in this embodiment, a constant interval). Open). At this time, the lower adhesive rubber 3B is overlapped so that the convex portion 3Bp is on the lower cover rubber 2B side, and the core material 1 is between the convex portions 3B of the lower cover rubber 2B adjacent in the belt width direction. Place it so that it is located in Further, the upper adhesive rubber 3A and the upper cover rubber 2A are stacked on the core body 1 in this order. At this time, the upper adhesive rubber 3A is arranged so that the sheet-like portion 3As side is the core body 1 side and the convex portion 3Ap is positioned between the core bodies 1 adjacent in the width direction. As described above, the cover rubber 2 (in this embodiment, the upper cover rubber 2A and the lower cover rubber 2B) is used via the adhesive rubber 3 (in this embodiment, the upper adhesive rubber 3A and the lower adhesive rubber 3B). The core material 1 is sandwiched and formed on the conveyor belt 10 by, for example, vulcanization, and the whole is bonded and integrated. In the manufacturing method according to the present embodiment, the procedure for stacking the members in the manufacturing process is not particularly limited, and may be formed in a state of being arranged in the arrangement relationship shown in FIG.

In the present embodiment, the upper cover rubber 2A and the upper adhesive rubber 3A are overlapped so that the convex portion 3Ap of the upper adhesive rubber 3A is on the upper cover rubber 2A side. The side adhesive rubber 3B is overlapped so that the convex portion 3Bp of the lower adhesive rubber 3B is on the lower cover rubber 2B side. For example, either the upper adhesive rubber 3A or the lower adhesive rubber 3B, or Both of them can be overlapped so that the convex portions 3Ap and / or the convex portions 3Bp are on the core body 1 side. In other words, either one or both of the upper adhesive rubber 3A and the lower adhesive rubber 3B, the sheet-like part 3As and / or the sheet-like part 3Bs is the upper cover rubber 3A and / or the lower cover rubber 2B side. It can also be overlaid so that
Further, in the upper adhesive rubber 3A and the lower adhesive rubber 3B, one of the convex portion 3Ap or the convex portion 3Bp is the core body 1 side, and the other of the convex portion 3Ap or the convex portion 3Bp is the upper cover rubber 2A or the lower cover rubber. It can also be arranged to be on the 2B side.

  Further, in the present embodiment, the cross-sectional shape in the width direction of the convex portion 3Ap of the upper adhesive rubber 3A and the convex portion 3Bp of the lower adhesive rubber 3B is a rectangle having a long side in the width direction, but is not particularly limited. For example, a cross-sectional shape having a curved contour such as a semicircle or a semi-ellipse may be used.

Next, the effect of the conveyor belt according to the present invention will be described below.
As described above, the conveyor belt 10 according to the present embodiment includes the cover rubber 2 (in this embodiment, the upper cover rubber 2A and the lower cover rubber 3B) and the adhesive rubber in a cross-sectional view in the belt width direction of the conveyor belt 10. Interface lines F1 and F2 with respect to 3 are convex outward in the belt width direction of the core body 1 and toward the belt inward in the belt width direction non-position position of the core body 1. As shown in FIG. 2, the straight line drawn perpendicularly to the outer surfaces 2As and 2Bs of the cover rubber 2 passes through the center of the core body 1 through the center of the core body 1. When the straight line extending at an angle of 45 ° from the base line L is defined as the first inclined line L1, the thickness T1 of the adhesive rubber on the first inclined line L1 is the thickness of the adhesive rubber 3 on the base line L. Thicker than T

On the other hand, in the conventional conveyor belt 30, a sectional view in the belt width direction showing a part of the conventional conveyor belt 30 is shown in FIG. 3 (a), and shown in FIG. 3 (b). As shown in the partial enlarged cross-sectional view showing the vicinity of one arbitrary core body 31, the thickness T1 of the adhesive rubber on the first inclined line L1 is larger than the thickness T of the adhesive rubber 3 on the base line L. thin. More specifically, for example, a first inclined line L1 extending at an angle of 45 ° with respect to the base line L, and a second inclination extending at an angle of 30 ° with respect to the base line L, for example. The distance between the side surface of the core 31 and the adhesive rubber 33 and the upper cover rubber 32A and / or the lower cover rubber 32B is short.
Here, the inventors diligently studied to improve the adhesiveness between the core body 31 and the cover rubber 32. When the conveyor belt is used, the side surface side of the core body 31 (indicated by a reference numeral R in FIG. Hereinafter, since the greatest stress acts on the interface between the adhesive rubber 33 and the “stress concentration region R”, when the thickness of the adhesive rubber 33 in the stress concentration region R is relatively thin, Starting from the interface between the adhesive rubber 33 and the cover rubber 32 having a difference in strength, there is a risk that the core body 31 and the cover rubber 32 may be peeled off, and the adhesiveness between the core body 31 and the cover rubber 32 is improved. It turns out that there is room. In addition, when the conveyor belt is laminated and molded using a simple flat plate-like adhesive sheet 3 (consisting only of sheet-like portions 3As and 3Bs) having no convex portions 3Ap and 3Bp as shown in FIG. It has also been found from the inventors' investigation that the thickness T1 of the adhesive rubber on the first inclined line L1 is thinner than the thickness T of the adhesive rubber 3 on the base line L.
Thus, in the conventional conveyor belt 30, the thickness T1 of the adhesive rubber on the first inclined line L1 passing on the stress concentration region R is thinner than the thickness T of the adhesive rubber 3 on the base line L ( That is, between the side surface of the core body 31 (interface between the core body 31 and the adhesive rubber 33) and the interface between the adhesive rubber 33 and the cover rubber 32 on the side surface side of the core body 31 where stress is concentrated. For example, when the conveyor belt 30 is used, the pulling force acting on the core body 31 or the core body 31 and the adhesive rubber 33 is used when the demand for adhesion between the core body 31 and the cover rubber 32 is high. When the peeling force acting between the core rubber 31 and the cover rubber 32 is excessive, the core body 31 and the cover rubber 32 may peel off.

  On the other hand, in the conveyor belt 10 according to the present embodiment, as described above, the adhesion on the first inclined line L1 that extends through the center of the core body 1 at an angle of 45 ° with respect to the base line L. The thickness T1 of the rubber 3 is made larger than the thickness T of the adhesive rubber 3 on the base line L, and the thickness of the adhesive rubber 3 in the portion where the stress is concentrated is relatively thick. Therefore, in the conveyor belt 10 according to the present embodiment, the stress generated on the side surface side of the core body 1 is not easily transmitted to the interface between the adhesive rubber 3 and the cover rubber 2. Therefore, the adhesiveness between the core body 1 and the cover rubber 2 can be improved.

  Furthermore, in the conveyor belt 10 according to the present embodiment, when a straight line that extends through the center of the core body 1 and inclines at an angle of 30 ° with respect to the base line L is the second inclined line L2, the second inclined line. It is preferable that the thickness L2 of the adhesive rubber 3 on L2 is thicker than the thickness of the adhesive rubber T on the base line L. According to this configuration, since the adhesive rubber 3 on the side surface side of the core body 1 where stress is concentrated when the conveyor belt 10 is used can be made sufficiently thick, the adhesion between the core body 1 and the adhesive rubber 3 can be increased. Further improvement can be achieved.

  From the same viewpoint, in the conveyor belt 10 according to the present embodiment, the thickness of the adhesive rubber 3 on all the inclined lines extending through the center of the core body 1 and inclined with respect to the base line L is It is preferable that the thickness is larger than the thickness T of the adhesive rubber 3.

  Further, from the same viewpoint, in the conveyor belt 10 according to the present embodiment, the adhesive rubber on a straight line that extends through the center of the core body 1 and inclines at an angle of more than 45 ° and not more than 135 ° with respect to the baseline L. Is thicker than the thickness T1 of the adhesive rubber 3 on the first inclined line L1.

  Moreover, in the conveyor belt 10 which concerns on this embodiment, it is preferable that the thickness of the adhesive rubber 3 in the belt width direction non-arrangement position of the core 1 is thicker than the thickness of the adhesive rubber 3 on the base line L. According to this configuration, since the adhesive rubber 3 on the side surface side of the core body 1 where stress is concentrated when the conveyor belt 10 is used can be made sufficiently thicker, the adhesion between the belt core body 1 and the adhesive rubber 3 can be increased. Can be further improved.

  From the same viewpoint, in the conveyor belt 10 according to this embodiment, the thickness along the belt width direction of the adhesive rubber 3 between the adjacent core bodies 1 is greater than the thickness T of the adhesive rubber 3 on the base line L. It is also preferable that the thickness is thick.

In the conveyor belt 10 according to the present embodiment, the interface line F1 between the upper cover rubber 2A and the adhesive rubber 3 and the interface line F2 between the lower cover rubber 2B and the adhesive rubber 3 in the belt width direction sectional view are Since the core body 1 has a concavo-convex shape that is convex at the belt width direction placement position of the core body 1 and concave at the belt width direction non-position position of the core body 1, the interface lines F1 and F2 are linear. Compared with a certain case, the adhesiveness between the upper cover rubber 2A and the upper adhesive rubber 3A and the adhesiveness between the lower cover rubber 2B and the lower adhesive rubber 3B can be enhanced. As a result, the adhesiveness between the core body 1 and the cover rubber 2 can be improved.
In addition, when making interface line F1, F2 into a linear form, since the adhesive rubber 3 becomes thick and cost is high, it is difficult to manufacture. Therefore, the interface lines F1, F2 have the above-described uneven shape. Has advantages in terms of cost and manufacturing.

  Further, in the method for manufacturing the conveyor belt 10 according to the present embodiment, there are a plurality of core bodies 1, a cover rubber 2 that encloses the core bodies 1, and an adhesive rubber 3 that bonds the core body 1 and the cover rubber 2. The upper adhesive rubber 3A and the lower adhesive rubber 3B have at least one of the upper adhesive rubber 3A and the lower adhesive rubber 2B on the sheet-like portions 3As and 3Bs extending in a sheet shape. A plurality of convex portions 3Ap, 3Bp extending continuously in the direction, and an adhesive rubber 3 arranged at intervals in the belt width direction, and the convex portions of the upper adhesive rubber 3A and / or the lower adhesive rubber 3B 3Ap and 3Bp are arranged so as to be positioned between the core bodies 1, and the conveyor belt 10 is formed. According to this manufacturing method, the conveyor belt 10 which improved the adhesiveness of the core 1 and the cover rubber 2 mentioned above can be obtained.

  1, 31: Core, 2, 32: Cover rubber, 2A, 32A: Upper cover rubber, 2As, 32As: Outer surface of upper cover rubber, 2B, 32B: Lower cover rubber, 2Bs, 32Bs: Lower cover rubber 3As, 3Bs: sheet-like part, 3Ap, 3Bp: convex part, 3,33: adhesive rubber, 3A: upper adhesive rubber, 3B: lower adhesive rubber, 10, 30: conveyor belt, F1, F2: Interface line, L: Base line, L1: First slope line, L2: Second slope line, T: Thickness of adhesive rubber on the base line, T1: Thickness of adhesive rubber on the first slope line, T2: Second slope Adhesive rubber thickness on the wire

Claims (6)

A conveyor belt having a plurality of core bodies arranged in the belt width direction and arranged in the belt width direction, a cover rubber including the core bodies, and an adhesive rubber for bonding the core body and the cover rubber. Because
In the belt width direction sectional view of the conveyor belt,
The interface line between the cover rubber and the adhesive rubber is convex toward the outside of the belt at the position in the belt width direction of the core, and the belt inward at the position at which the core body is not disposed in the belt width direction. Concave shape, concave and convex toward the
A straight line extending through the center of the core body and extending perpendicularly to the outer surface of the cover rubber is defined as a base line, and a straight line extending through the center of the core body and inclined at an angle of 45 ° with respect to the base line is defined as a first line. The conveyor belt according to claim 1, wherein the thickness of the adhesive rubber on the first inclined line is thicker than the thickness of the adhesive rubber on the base line.   When a straight line that passes through the center of the core and extends at an angle of 30 ° with respect to the base line is defined as the second inclined line, the thickness of the adhesive rubber on the second inclined line is The conveyor belt according to claim 1, wherein the conveyor belt is thicker than the adhesive rubber.   3. The thickness of the adhesive rubber on all inclined lines extending through an inclination with respect to the base line through the center of the core body is greater than the thickness of the adhesive rubber on the base line. Conveyor belt.   The conveyor belt according to any one of claims 1 to 3, wherein a thickness of the adhesive rubber at a position where the core body is not arranged in the belt width direction is thicker than a thickness of the adhesive rubber on the base line.   The conveyor belt according to any one of claims 1 to 4, wherein a thickness along the belt width direction of the adhesive rubber between the adjacent core bodies is thicker than a thickness of the adhesive rubber on the base line. A method for manufacturing a conveyor belt, comprising:
A plurality of cores;
A cover rubber having an upper cover rubber and a lower cover rubber;
An adhesive rubber that bonds the core and the cover rubber, and includes an upper adhesive rubber and a lower adhesive rubber, and at least one of the upper adhesive rubber and the lower adhesive rubber extends in a sheet shape. On the sheet-like portion, using an adhesive rubber in which a plurality of convex portions extending continuously in the belt longitudinal direction are arranged at intervals in the belt width direction, and
Laminating the lower cover rubber, the lower adhesive rubber, the core, the upper adhesive rubber, and the upper cover rubber in this order,
A method for manufacturing a conveyor belt, comprising forming the conveyor belt by placing the upper adhesive rubber and / or the sheet-like portion of the lower adhesive rubber so as to be positioned on the core body side.

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