belt

Abstract

To provide a belt capable of corresponding to a low-temperature environment, especially a freezing environment of -30°C or less, and capable of ensuring grip performance.SOLUTION: A belt 1 incorporates at least one layer of canvas 10, and is covered on both sides with resin layers 11A, 11B. The surfaces SA, SB of the resin layers 11A, 11B have a surface roughness Rzjis of 25 μm to 180 μm.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to belts, such as power transmission belts. [Background technology]

[0002] Power transmission belts used for driving roller conveyors and the like are required to have high tension, flange resistance (belt rigidity in the width direction), gripping properties, etc. To ensure gripping properties, belts using, for example, rubber on the surface are used.

[0003] Moreover, in recent years, there are cases where the device is used in low-temperature environments such as freezers operated at temperatures below -30°C, and there is a demand for the device to be able to withstand low-temperature environments.

[0004] Patent Document 1 discloses a flat belt having a thermoplastic resin layer containing a thermoplastic urethane resin and a high tensile member made of a cord embedded in the resin layer.

[0005] Moreover, Patent Document 2 discloses a belt using a urethane-based thermoplastic elastomer. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 09-166183 [Patent Document 2] JP 2011-206953 A Summary of the Invention [Problem to be solved by the invention]

[0007] Conventionally, power transmission belts have been made with rubber on the surface to ensure grip, but the rubber is prone to cracking in low-temperature environments below the glass transition temperature of rubber.

[0008] An object of the present invention is to provide a belt that can withstand low temperature environments, particularly freezing environments at temperatures below -30°C, and that can ensure gripping properties. [Means for solving the problem]

[0009] The belt of the present invention incorporates at least one layer of canvas and is covered on both sides with a resin layer, and the surface of the resin layer has a surface roughness Rzjis of 25 μm to 180 μm. Effect of the Invention

[0010] According to the belt of the present invention, at least one layer of canvas is incorporated, and both sides are covered with a resin layer. Since no rubber is used on the surface, the occurrence of cracks in low-temperature environments is suppressed, making it possible to withstand low-temperature environments. Furthermore, since the surface roughness Rzjis of the surface of the resin layer is 25 μm to 180 μm, gripping force can be ensured even without using rubber. [Brief description of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view of a belt according to an embodiment of the present invention. [Diagram 2] 1 is a cross-sectional view of a belt according to a first embodiment of the present invention. [Diagram 3] FIG. 4 is a cross-sectional view of a belt according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described. However, the embodiment described below is merely an example, and can be appropriately modified within a scope obvious to a person skilled in the art.

[0013] <Embodiment> (Belt configuration) Fig. 1 is a cross-sectional view of a belt 1 according to this embodiment. The belt 1 of this embodiment incorporates at least one layer of canvas 10, and both sides are covered with resin layers 11A and 11B. In this embodiment, the resin layer 11A, the canvas 10, and the resin layer 11B are laminated in this order. The canvas 10 and the resin layers 11A and 11B are bonded together, for example, by using an adhesive or by hot pressing.

[0014] The surfaces SA and SB of the resin layers 11A and 11B have a surface roughness Rzjis of 25 μm to 180 μm.

[0015] The surfaces SA and SB of the resin layers 11A and 11B are, for example, surfaces onto which the surface shape of the transfer canvas is transferred by pressing the transfer canvas against the surface and applying heat and pressure, that is, so-called textured surfaces. This makes it possible to realize a surface with a surface roughness Rzjis of 25 μm to 180 μm. The surface with a surface roughness Rzjis of 25 μm to 180 μm is not limited to a textured surface, but may be a surface controlled to have a predetermined surface shape by other means such as mechanical texture.

[0016] The surface roughness is the ten-point average roughness (Rzjis) in a randomly selected area of ​​the surface of the object, as described in JIS B 0601: 2001. The surface roughness can be measured, for example, by using a Handysurf (product name) manufactured by Tokyo Seimitsu Co., Ltd.

[0017] The resin layers 11A and 11B are, for example, thermoplastic resin layers, specifically, thermoplastic urethane resin layers. The glass transition temperature of the resin constituting the resin layers 11A and 11B is preferably lower than the environmental temperature in which the belt of the present embodiment is used. For example, the resin constituting the resin layers 11A and 11B is a urethane resin with a glass transition temperature of -30°C. The belt 1 of the present embodiment having such a configuration is suitable for low temperature environments.

[0018] The resin layers 11A and 11B may contain other resins to the extent that they do not affect or have substantially no effect on the performance of the belt 1 based on the characteristics of the resin, such as the glass transition temperature. The resin layers 11A and 11B may also contain additives, such as stabilizers and lubricants. The resin constituting the resin layers 11A and 11B may be a urethane resin having a glass transition temperature of -30°C or lower.

[0019] The resin layers 11A and 11B are substrates obtained by extruding a resin such as a urethane resin into a sheet shape using an extruder and stretching or rolling the sheet in a uniaxial direction. For example, it is preferable that the belt is elongated in one direction and the longitudinal direction of the belt coincides with the uniaxial direction.

[0020] The canvas 10 is made of, for example, polyester fibers woven in. Alternatively, it may be made of other resin fibers woven in. For example, nylon fibers or the like may be used.

[0021] The canvas 10 has a thickness of, for example, 0.35 mm to 1.10 mm. The resin layers 11A and 11B each have a thickness of, for example, 0.20 mm to 1.2 mm. The belt as a whole has a thickness of about 0.75 mm to 3.5 mm.

[0022] The belt 1 of the present embodiment described above can be manufactured by laminating the canvas 10 and the resin layers 11A and 11B, and bonding them together, for example, using an adhesive or by heat and pressure bonding.

[0023] In the above manufacturing process, the transfer canvas is pressed against the surfaces SA and SB of the resin layers 11A and 11B, heated and pressurized, and then the transfer canvas is peeled off to transfer the surface shape of the transfer canvas. This allows the formation of a textured surface.

[0024] Although the drawing shows a configuration having one layer of canvas, a configuration incorporating multiple layers of canvas is also possible. In this case, an interlayer resin layer (not shown) is provided between the multiple layers of canvas. When multiple layers of canvas are incorporated, each canvas can have the same configuration as the above-mentioned canvas. The interlayer resin layer can have the same configuration as the above-mentioned resin layers 11A and 11B. By making it multi-layered, flange resistance can be improved.

[0025] The belt 1 of the present embodiment can be suitably applied to a power transmission belt.

[0026] (Action and effect) According to the belt 1 of the present embodiment, since the transmission belt does not use rubber, it can withstand low temperature environments, particularly freezing environments of -30°C or less, reducing early cracks, and furthermore, since the surface roughness Rzjis is 25 μm to 180 μm, gripping properties can be ensured.Since the surface is textured, gripping properties can be ensured.

[0027] Furthermore, the multi-layered canvas structure improves flange resistance.

[0028] <First Example> 2 is a cross-sectional view of the belt 1A according to the first embodiment. A resin layer 11A, a first canvas 10A, an interlayer resin layer 11C, a second canvas 10B, an interlayer resin layer 11D, a third canvas 10C, and a resin layer 11B are laminated in this order. The resin layers 11A and 11B are the outermost layers of the laminate. In other words, four resin layers and three canvas layers are laminated alternately.

[0029] The surfaces SA and SB of the resin layers 11A and 11B are textured surfaces, and have a surface roughness Rzjis of 100 μm to 150 μm.

[0030] The resin constituting the above-mentioned resin layer 11A, interlayer resin layer 11C, interlayer resin layer 11D, and resin layer 11B is a thermoplastic polyurethane elastomer "Elastollan (registered trademark) C90A" with a glass transition temperature of -30°C. It is also possible to use a thermoplastic polyurethane elastomer "Elastollan (registered trademark) C85A" (glass transition temperature of -35°C), which is a urethane resin with a glass transition temperature of -30°C or lower. The first canvas 10A, the second canvas 10B, and the third canvas 10C are polyester canvases.

[0031] The thickness of the resin layer 11A, the interlayer resin layer 11C, the interlayer resin layer 11D, and the resin layer 11B is 0.4 mm each. The thickness of the first canvas 10A, the second canvas 10B, and the third canvas 10C is 0.5 mm each, and the belt as a whole is 3.1 mm thick.

[0032] As this power transmission belt does not use rubber, it can withstand low temperature environments and reduces early cracking. Furthermore, the fabric has a surface roughness Rzjis of 25μm~180μm, ensuring grip, and the multi-layered canvas construction enhances flange resistance.

[0033] <Second Example> 3 is a cross-sectional view of a belt 1B according to the second embodiment. A resin layer 11A, a first canvas 10A, an interlayer resin layer 11C, a second canvas 10B, and a resin layer 11B are laminated in this order. The resin layers 11A and 11B are the outermost layers of the laminate. In other words, three resin layers and two canvas layers are laminated alternately.

[0034] The surfaces SA and SB of the resin layers 11A and 11B are textured surfaces, and have a surface roughness Rzjis of 25 μm to 70 μm.

[0035] The resin constituting the resin layer 11A, the interlayer resin layer 11C, and the resin layer 11B is "Elastollan (registered trademark) C90A" as in Example 1. The first canvas 10A and the second canvas 10B are polyester canvas.

[0036] The resin layer 11A, the interlayer resin layer 11C, and the resin layer 11B each have a thickness of 0.4 mm. The first canvas 10A and the second canvas 10B each have a thickness of 0.4 mm, and the belt as a whole has a thickness of 2.0 mm.

[0037] As this power transmission belt does not use rubber, it can withstand low temperature environments and reduces early cracking. Furthermore, with a surface roughness Rzjis of 25μm~180μm, grip performance is ensured, and the multi-layered canvas structure enhances flange resistance. [Explanation of symbols]

[0038] 1,1A,1B Belt 10 Canvas 10A 1st canvas 10B 2nd canvas 10C 3rd Canvas 11A,11B Resin layer 11C,11D Interlayer resin layer SA,SB surface

Claims

1. It contains at least one layer of canvas, Both sides are coated with a resin layer. The surface of the resin layer has a surface roughness Rzjis of 25 μm to 180 μm. belt.

2. The surface of the resin layer is a surface onto which the surface shape of the transfer canvas is transferred by pressing the transfer canvas against the surface and applying heat and pressure.

2. The belt of claim 1.

3. The resin layer is a thermoplastic resin layer.

2. The belt of claim 1.

4. The resin layer is a thermoplastic urethane resin layer.

4. The belt according to claim 3.

5. Built-in multi-layer canvas The belt according to any one of claims 1 to 4.

6. The canvas has an interlayer resin layer between the multiple layers.

6. The belt according to claim 5.

Images