Apparatus and method for producing sheet-like rubber material

Abstract

A manufacturing device and a manufacturing method for sheet rubber material. A sheet rubber material is manufactured with high precision at a desired weight. The manufacturing device (1) is used to manufacture unvulcanized sheet rubber material (G). It comprises: a traction conveyor (3) capable of adjusting the conveying speed, which conveys the rubber material (G) to the downstream side of the conveying direction; a first cooling device (5) which cools the rubber material (G); a second weight measuring device (6) which measures the weight per unit length of the rubber material (G) after being cooled by the first cooling device (5); and a control device (7) which controls the conveying speed of the traction conveyor (3) based on the weight per unit length of the rubber material (G) measured by the second weight measuring device (6).

Description

Technical Field

[0001] The present invention relates to a manufacturing device and a manufacturing method of a sheet-like rubber material. Background Art

[0002] Patent Document 1 below describes a method for controlling the weight of extruded rubber for maintaining the weight per unit length of unvulcanized rubber extruded from an extruder at a predetermined value. In this weight control method, the unvulcanized rubber is placed on a traction conveyor disposed immediately behind the extruder for conveyance, and the linear speed of the traction conveyor is increased or decreased based on a deviation between the weight of the unvulcanized rubber placed on the traction conveyor and a predetermined reference value.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 6-182854 Summary of the invention

[0004] The unvulcanized rubber as described above has a high temperature immediately after being extruded by the extruder, but is cooled and shrinks during being conveyed by the traction conveyor. Therefore, the weight per unit length of the unvulcanized rubber changes greatly before and after the shrinkage. On the other hand, the weight control method described above does not study such shrinkage, and there is still room for improvement in manufacturing while maintaining the weight per unit length of the unvulcanized rubber at a specified value.

[0005] The present invention has been made in view of the above-mentioned actual situation, and a main object of the present invention is to provide an apparatus and a method for manufacturing a sheet-shaped rubber material capable of manufacturing a sheet-shaped rubber material to a desired weight with high accuracy.

[0006] The present invention is a manufacturing device for manufacturing unvulcanized sheet rubber material, the manufacturing device for sheet rubber material comprising: an extruder, which continuously extrude the rubber material; a traction conveyor capable of adjusting the conveying speed, which receives the rubber material extruded from the extruder and conveys it to the downstream side in the conveying direction; a first weight measuring device, which is arranged on the downstream side of the conveying direction of the traction conveyor and measures the weight per unit length of the rubber material during conveyance; a first cooling device, which cools the rubber material after being measured by the first weight measuring device; a second weight measuring device, which measures the weight per unit length of the rubber material after being cooled by the first cooling device; and a control device, which controls the conveying speed of the traction conveyor based on the weight per unit length of the rubber material measured by the first weight measuring device and the second weight measuring device.

[0007] In the apparatus for producing a sheet-like rubber material according to the present invention, it is preferable that the first cooling device cools the temperature of the rubber material to 60°C to 80°C.

[0008] In the apparatus for producing a sheet-like rubber material according to the present invention, it is preferable that the first cooling device cools the rubber material by applying a liquid.

[0009] In the apparatus for producing a sheet-like rubber material of the present invention, it is preferable that the liquid is water.

[0010] In the manufacturing device of the sheet rubber material of the present invention, it is preferred that the device includes a transport conveyor for transporting the rubber material cooled by the first cooling device to the downstream side of the transport direction, the transport conveyor includes an inclined portion inclined upward toward the downstream side of the transport direction, and the second weight measuring device is arranged on the downstream side of the transport direction relative to the inclined portion.

[0011] In the manufacturing apparatus of the sheet-like rubber material of the present invention, preferably, a second cooling device for cooling the rubber material after being measured by the second weight measuring device is included.

[0012] The apparatus for producing a sheet-like rubber material of the present invention preferably includes a cutting device for cutting the rubber material cooled by the second cooling device into a predetermined length.

[0013] The manufacturing apparatus of the sheet-like rubber material of the present invention preferably includes a third weight measuring device for measuring the weight of the rubber material cut by the cutting device.

[0014] In the apparatus for producing a sheet rubber material of the present invention, the second weight measuring device is preferably disposed at a position 15% to 35% of the stroke length between the extruder and the third weight measuring device on the downstream side from the extruder in the conveying direction.

[0015] The present invention is a method for manufacturing an unvulcanized sheet-like rubber material, wherein the method for manufacturing an unvulcanized sheet-like rubber material comprises: a step of continuously extruding the rubber material from an extruder; a step of receiving the rubber material extruded from the extruder by a traction conveyor and conveying it to the downstream side in a conveying direction; a first measuring step of measuring the weight per unit length of the rubber material during conveyance by the traction conveyor; a step of cooling the rubber material measured in the first measuring step; a second measuring step of measuring the weight per unit length of the rubber material after cooling in the cooling step; and a step of controlling the conveying speed of the traction conveyor based on the weight per unit length of the rubber material measured in the first measuring step and the second measuring step.

[0016] The present invention adopts the above-mentioned structure, and can manufacture the sheet-shaped rubber material to a desired weight with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a side view conceptually illustrating a production apparatus according to one embodiment of the present invention.

[0018] Figure 2 This is a flow chart of a production method according to one embodiment of the present invention.

[0019] Description of symbols

[0020] 1: manufacturing device; 3: traction conveyor; 5: first cooling device; 6: second weight measuring device; 7: control device; G: rubber material. DETAILED DESCRIPTION

[0021] Hereinafter, one embodiment of the present invention will be described based on the drawings.

[0022] Figure 1 It is a side view conceptually showing an embodiment of a manufacturing device for sheet-like rubber material of the present invention (hereinafter, sometimes referred to as "device"). The device 1 of this embodiment is used to manufacture unvulcanized sheet-like rubber material G. The rubber material G manufactured by the device 1 is suitable for use as a tread rubber as a component of a tire, for example. The "unvulcanized" includes all forms that have not reached complete vulcanization, and the so-called semi-vulcanized state is included in "unvulcanized". In addition, "sheet-like" refers to both the case where the thickness and width of the rubber material G are uniform or vary in its conveying direction. In addition, the rubber material G of the present invention is not limited to use as a component of a tire.

[0023] like Figure 1 As shown, the device 1 of this embodiment includes an extruder 2, a traction conveyor 3, a first weight measuring device 4, a first cooling device 5, a second weight measuring device 6, and a control device 7. The device 1 also includes, for example, a transport conveyor 8, a second cooling device 9, a cutting device 10, and a third weight measuring device 11. In addition, Figure 1 The up-and-down direction represents the vertical direction, and the left-and-right direction represents the horizontal direction.

[0024] The extruder 2 of this embodiment has the function of continuously extruding a sheet-shaped rubber material G. The extruder 2, for example, adopts a known structure including a main body 2a including a screw (not shown) for kneading the rubber material G and an extrusion head 2b including an extrusion die (not shown) for forming the rubber material G into a sheet. In this embodiment, the extruder 2 is configured to freely adjust the extrusion speed of the rubber material G.

[0025] Although not particularly limited, the length of the rubber material G extruded from the extruder 2 in the conveying direction is 120 m or more. The rubber material G has a width of 120 mm to 350 mm and a thickness of 5 mm to 15 mm.

[0026] The traction conveyor 3 of this embodiment has the function of receiving the rubber material G extruded from the extruder 2 and conveying the rubber material G to the downstream side in the conveying direction. The “conveying direction” is the conveying direction in which the traction conveyor 3 and the transport conveyor 8 convey the rubber material G. Figure 1 In FIG. 1 , the downstream side in the conveying direction is indicated by an arrow.

[0027] The traction conveyor 3 is composed of a roller conveyor of a known structure in which a plurality of rollers 12 are arranged in a conveying direction. In this embodiment, the rollers 12 are driven by a motor (not shown) and the conveying speed thereof can be adjusted. The traction conveyor 3 is not limited to such a form.

[0028] The traction conveyor 3 includes, for example, an upstream portion 3a and a downstream portion 3b disposed downstream of the upstream portion 3a in the conveying direction. The upstream portion 3a is formed to be shorter in the conveying direction than the downstream portion 3b. Both the upstream portion 3a and the downstream portion 3b include rollers 12, for example.

[0029] The transport conveyor 8 of the present embodiment is disposed on the downstream side in the transport direction of the drag conveyor 3. The rubber material G transported by the drag conveyor 3 is continuously transported by the transport conveyor 8.

[0030] The transport conveyor 8 includes, for example, a first portion 8a, a second portion 8b, an inclined portion 8c, and a cutting portion 8d. The first portion 8a of the present embodiment is adjacent to the traction conveyor 3, and can transport the rubber material G in the process of being cooled by the first cooling device 5. The second portion 8b of the present embodiment can transport the rubber material G in the process of being cooled by the second cooling device 9. The inclined portion 8c of the present embodiment is a portion inclined upward toward the downstream side of the conveying direction. In the present embodiment, the inclined portion 8c is arranged between the first portion 8a and the second portion 8b in the conveying direction. The cutting portion 8d of the present embodiment is provided with a cutting device 10 on the upper side to receive the rubber material G cut by the cutting device 10.

[0031] The transport conveyor 8 is configured as a belt conveyor of a known structure including a plurality of guide rollers 13 and a non-elastic conveyor belt 14, and the non-elastic conveyor belt 14 is rotatably wound around each guide roller 13. In the present embodiment, the first portion 8a, the second portion 8b, the inclined portion 8c, and the cutting portion 8d are each configured as a belt conveyor. The rubber material G is transported on the conveyor belt 14.

[0032] The first weight measuring device 4 and the second weight measuring device 6 of the present embodiment have the function of measuring the weight per unit length of the rubber material G (hereinafter, sometimes referred to as "weight per unit length"). The first weight measuring device 4 and the second weight measuring device 6 are preferably, for example, measuring devices with rollers of a known structure. Such a method can measure the weight per unit length of the rubber material G without stopping the transportation of the rubber material G. The measurement of the weight per unit length based on the first weight measuring device 4 and the second weight measuring device 6 can be performed continuously, or it can be measured every few seconds or at a specified time. The first weight measuring device 4 and the second weight measuring device 6 preferably convert their measurement results into signals such as electrical signals d and output them to the control device 7.

[0033] In the present embodiment, the first weight measuring device 4 is arranged on the downstream side of the conveying direction of the traction conveyor 3. The first weight measuring device 4 is arranged, for example, between the upstream portion 3a and the downstream portion 3b. Such a first weight measuring device 4 measures the weight per unit length of the relatively high temperature rubber material G extruded by the extruder 2.

[0034] The first cooling device 5 and the second cooling device 9 of this embodiment have the function of cooling the rubber material G. Thus, the contraction of the rubber material G is promoted. In this embodiment, the first cooling device 5 and the second cooling device 9 cool the rubber material G by spraying a liquid such as water. In this embodiment, the first cooling device 5 and the second cooling device 9 include a sprinkler head 16 of a known structure that can sprinkle water. The first cooling device 5 and the second cooling device 9 are configured by arranging a plurality of sprinkler heads 16 in the conveying direction of the rubber material G.

[0035] In the present embodiment, the first cooling device 5 is arranged on the downstream side of the conveying direction of the first weight measuring device 4. Thus, the first cooling device 5 cools the rubber material G measured by the first weight measuring device 4 to promote shrinkage. Although not particularly limited, the first cooling device 5 preferably has a cooling capacity for cooling the rubber material G to 60° C. to 80° C., for example. The first cooling device 5 cools the rubber material G conveyed by the first portion 8a, for example.

[0036] The second cooling device 9 has a larger number of sprinkler heads 16 than the first cooling device 5 and has a greater cooling capacity than the first cooling device 5. In this embodiment, the second cooling device 9 cools the rubber material G conveyed by the second portion 8b.

[0037] In this embodiment, the second weight measuring device 6 is disposed downstream in the conveying direction of the first cooling device 5. Thus, the second weight measuring device 6 can measure the rubber material G whose weight per unit length has changed less after being cooled by the first cooling device 5.

[0038] The second weight measuring device 6 is disposed, for example, on the downstream side of the inclined portion 8c in the conveying direction. As a result, water attached to the rubber material G by being sprayed by the first cooling device 5 is discharged downward through the inclined portion 8c, and therefore, the weight per unit length of the rubber material G excluding the water can be measured by the second weight measuring device 6. The second weight measuring device 6 is disposed, for example, between the inclined portion 8c and the second portion 8b.

[0039] In order to more accurately measure the weight of the rubber material G by the second weight measuring device 6, a known air supply device (not shown) including a blower or a fan may be provided near the inclined portion 8c. Such an air supply device can blow away water adhering to the rubber material G and further drain water.

[0040] For example, with respect to the length of the stroke between the extruder 2 and the third weight measuring device 11, if the second weight measuring device 6 is arranged on the side closer to the third weight measuring device 11 than the extruder 2, it takes a long time to feed back the measurement result of the second weight measuring device 6 to the traction conveyor 3. This causes a large amount of unsuitable rubber material G to be produced. Therefore, in the present embodiment, it is preferred that the second weight measuring device 6 is arranged at a position of 15% to 35% of the stroke length between the extruder 2 and the third weight measuring device 11 on the downstream side in the conveying direction from the extruder 2. Thus, the production of unsuitable rubber material G can be suppressed.

[0041] The cutting device 10 can cut the conveyed rubber material G into a predetermined length. The cutting device 10 of this embodiment cuts the rubber material G cooled by the second cooling device 9. In this embodiment, the cutting device 10 is arranged above the cutting portion 8d. The cutting device 10 has a known structure including, for example, a cutter 10a and a moving portion 10b that moves the cutter 10a to a predetermined position. The rubber material G is cut into a length of, for example, 2m to 3m by the cutting device 10.

[0042] The third weight measuring device 11 measures the weight of the rubber material Ga cut by the cutting device 10, for example. In the present embodiment, the third weight measuring device 11 measures the total weight of each of the cut rubber materials G. Based on the result measured by the third weight measuring device 11, it is determined whether the rubber material Ga is qualified, for example, whether it is suitable as a tread rubber. The third weight measuring device 11 is preferably a belt conveyor type measuring device of a known structure.

[0043] On the upstream side and the downstream side in the conveying direction of the third weight measuring device 11 , for example, a plurality of rollers 12 are arranged in the conveying direction.

[0044] The control device 7 of the present embodiment can control the conveying speed of the traction conveyor 3 based on the electrical signal d output from the first weight measuring device 4 and the second weight measuring device 6. For example, when the weight per unit length of the rubber material G measured by the first weight measuring device 4 or the second weight measuring device 6 is larger than a predetermined value, the control device 7 increases the conveying speed of the traction conveyor 3 and applies a tensile force to the rubber material G to reduce its weight per unit length. In addition, when the weight per unit length of the rubber material G measured by the first weight measuring device 4 or the second weight measuring device 6 is smaller than a predetermined value, the control device 7 reduces the conveying speed of the traction conveyor 3 and applies a compressive force to the rubber material G to increase its weight per unit length. Thus, the device 1 of the present embodiment can manufacture the rubber material G with a desired weight with high precision.

[0045] The control device 7 may also control the conveying speed of the traction conveyor 3 based on the electrical signal output from the third weight measuring device 11, for example. In addition, the control device 7 may also adjust the extrusion speed of the extruder 2 according to the material or shape of the rubber material G. As the control device 7, for example, a programmable sequencer, a microcomputer, a personal computer, or other known control devices are preferably used.

[0046] Next, a method for producing the rubber material G using such an apparatus 1 will be described. Figure 2 : is a flow chart of the manufacturing method of this embodiment. Figure 2 As shown, the manufacturing method of this embodiment includes an extrusion process S1, a conveying process S2, a first measuring process S3, a control process, a first cooling process S5, and a second measuring process S6. In addition, in this embodiment, the manufacturing method further includes a second cooling process S7, a cutting process S8, and a third measuring process S9. The control process of this embodiment includes a first control process S4a and a second control process S4b.

[0047] In the production method of the present embodiment, first, an extrusion step S1 is performed. In the extrusion step S1 of the present embodiment, the rubber material G is continuously extruded from the extruder 2. The temperature of the rubber material G immediately after being extruded from the extruder 2 is, for example, 90°C to 110°C.

[0048] In this embodiment, the rubber material G extruded from the extruder 2 is formed into a continuous sheet between the extrusion head 2b of the extruder 2 and the cutting device 10. The length of the rubber material G is not particularly limited as long as it is greater than a predetermined length cut by the cutting device 10.

[0049] Next, the conveying step S2 is performed. In the conveying step S2 of the present embodiment, the rubber material G extruded from the extruder 2 is pulled by the traction conveyor 3 and conveyed to the downstream side in the conveying direction. The conveying speed of the traction conveyor 3 at this time is set based on, for example, a predetermined total weight of a rubber material G cut by the cutting device 10. Such a conveying speed of the traction conveyor 3 is programmed by the control device 7.

[0050] In this embodiment, the conveying step S2 is continued until the sheet-shaped rubber material G extruded from the extruder 2 is weighed by at least the third weight measuring device 11. The conveying step S2 is continued while the rubber material G is conveyed by the traction conveyor 3 and the transport conveyor 8, for example.

[0051] Next, the first measurement step S3 is performed. In the first measurement step S3 of the present embodiment, the weight per unit length of the rubber material G during transportation is measured. In the first measurement step S3, the weight per unit length of the rubber material G is measured by the first weight measurement device 4. The first weight measurement device 4 outputs an electrical signal d based on the measured weight per unit length of the rubber material G to the control device 7.

[0052] Next, the first control step S4a is performed. In the present embodiment, the first control step S4a controls the conveying speed of the traction conveyor 3 according to the result measured in the first measurement step S3. Thus, the rubber material G on the traction conveyor 3 can be made to have a desired unit length weight. In the first control step S4a of the present embodiment, the control device 7 controls the conveying speed of the traction conveyor 3.

[0053] Next, the first cooling step S5 is performed. In the first cooling step S5, the rubber material G measured in the first measuring step S3 is cooled by, for example, the first cooling device 5. In the first cooling step S5 of the present embodiment, water from the sprinkler head 16 of the first cooling device 5 is sprayed on the rubber material G being conveyed by the first portion 8a, and the rubber material G is cooled to, for example, 60° C. to 80° C. As a result, the change in the weight per unit length of the rubber material G on the downstream side of the first cooling device 5 in the conveying direction becomes smaller.

[0054] Next, the second measuring step S6 is performed. The second measuring step S6 measures, for example, the weight per unit length of the rubber material G cooled by the first cooling step S5. In the second measuring step S6, the rubber material G after passing through the inclined portion 8c is measured by the second weight measuring device 6. The second weight measuring device 6 outputs an electrical signal d based on the measured weight per unit length of the rubber material G to the control device 7.

[0055] Next, the second control step S4b is performed. The second control step S4b of the present embodiment controls the conveying speed of the traction conveyor 3 based on the weight per unit length of the rubber material G measured in the second measuring step S6. In this way, in the second control step S4b, the conveying speed of the traction conveyor 3 is controlled based on the weight per unit length of the rubber material G that is cooled by the first cooling device 5 and whose shrinkage is accelerated, so that the rubber material G conveyed by the traction conveyor 3 can have a desired weight per unit length. In the second control step S4b of the present embodiment, the control device 7 controls the conveying speed of the traction conveyor 3.

[0056] Next, the second cooling step S7 is performed. In the present embodiment, the second cooling step S7 cools the rubber material G measured in the second measuring step S6 by the second cooling device 9. In the second cooling step S7, for example, the rubber material G is cooled while being conveyed by the second portion 8b of the conveying conveyor 8. The rubber material G cooled in the second cooling step S7 is set to a desired temperature as a tire component of a molded green tire, for example.

[0057] Next, a cutting step S8 is performed. In the cutting step S8 of the present embodiment, the rubber material G is cut into a predetermined length by the cutting device 10. Thus, the rubber material G having a desired length is formed as a component of the tire.

[0058] Next, the third measuring step S9 is performed. In the third measuring step S9 of the present embodiment, the total weight of the rubber material G cut in the cutting step S8 is measured. In the manufacturing method of the present embodiment, since the conveying speed of the traction conveyor 3 is controlled based on the weight per unit length of each rubber material G contracted in the first cooling step S5, the total weight of the rubber material G can be made to be a desired weight with high accuracy.

[0059] As mentioned above, although the particularly preferred embodiment of the present invention has been described in detail, the present invention is not limited to the illustrated embodiment, and can be implemented in various modified forms.

[0060] [Example]

[0061] In order to confirm the effect of the present invention, Figure 1 The manufacturing apparatus shown in the figure is used to manufacture a sheet of rubber material. Then, the weight accuracy of the rubber material is tested. The general specifications and test methods are as follows.

[0062] <Weight Accuracy Test 1>

[0063] The rubber material is manufactured using the manufacturing apparatus of the embodiment and the comparative example. Then, the weight of the rubber material is measured by the third weight measuring device, and the ratio of the rubber material deviating from the target weight is calculated. The result is expressed as a real number. The smaller the value, the better. In addition, the manufacturing apparatus of the comparative example is Figure 1 The test results are shown in Table 1.

[0064] Rubber material: tread rubber of pneumatic tire with tire size of 165 / 65R14

[0065] Number of rubber materials manufactured: 10,000

[0066] Target weight of rubber material: 2129±60g

[0067]

Table 1

[0068]

[0069] <Weight Accuracy Test 2>

[0070] The rubber material is manufactured by the manufacturing method of the embodiment and the comparative example. Then, the weight of the rubber material is measured by a third weight measuring device, and the deviation of the weight is calculated. The manufacturing method of the comparative example is the same as the manufacturing method of the embodiment except that the first cooling step is not performed. The result is represented by the average value of the difference from the target weight. The smaller the value, the better.

[0071] Rubber material: tread rubber of pneumatic tire with tire size of 165 / 65R14

[0072] Temperature of rubber material just after extrusion from the extruder: 100°C

[0073] Target weight of rubber material: 2129g

[0074] Number of rubber materials manufactured: 30

[0075] The test results are shown in Table 2.

[0076]

Table 2

[0077]

[0078] As a result of the test, it was found that the manufacturing apparatus and the manufacturing method of the embodiment can manufacture the rubber material with higher accuracy than the manufacturing apparatus and the manufacturing method of the comparative example.

Claims

1. A manufacturing device for a sheet-like rubber material, which is used to manufacture an unvulcanized sheet-like rubber material, The manufacturing device of the sheet-like rubber material comprises: an extruder that continuously extrude the rubber material; a traction conveyor capable of adjusting a conveying speed, receiving the rubber material extruded from the extruder and conveying it to a downstream side in a conveying direction; a first weight measuring device disposed on a downstream side of the traction conveyor in the conveying direction and configured to measure a weight per unit length of the rubber material during conveyance; a first cooling device for cooling the rubber material after being measured by the first weight measuring device; a second weight measuring device for measuring a weight per unit length of the rubber material after being cooled by the first cooling device; as well as a control device for controlling a conveying speed of the traction conveyor based on the weight per unit length of the rubber material measured by the first weight measuring device and the second weight measuring device, The manufacturing device of the sheet-like rubber material includes a transport conveyor for transporting the rubber material cooled by the first cooling device to a downstream side in the transport direction. The transport conveyor includes an inclined portion that is inclined upward toward the downstream side in the transport direction, and the inclined portion is arranged on the downstream side in the transport direction relative to the first cooling device. The second weight measuring device is arranged on the downstream side of the inclined portion in the conveying direction.

2. The manufacturing device of the sheet-like rubber material according to claim 1, wherein: The first cooling device cools the temperature of the rubber material to 60°C to 80°C.

3. The manufacturing device of the sheet-like rubber material according to claim 1 or 2, wherein: The first cooling device applies liquid to the rubber material to cool it.

4. The manufacturing device of the sheet-like rubber material according to claim 3, wherein: The liquid is water.

5. A manufacturing device for a sheet-like rubber material, which is used to manufacture an unvulcanized sheet-like rubber material, The manufacturing device of the sheet-like rubber material comprises: an extruder that continuously extrude the rubber material; a traction conveyor capable of adjusting a conveying speed, receiving the rubber material extruded from the extruder and conveying it to a downstream side in a conveying direction; a first weight measuring device disposed on a downstream side of the traction conveyor in the conveying direction and configured to measure a weight per unit length of the rubber material during conveyance; a first cooling device for cooling the rubber material after being measured by the first weight measuring device; a second weight measuring device for measuring a weight per unit length of the rubber material after being cooled by the first cooling device; as well as a control device for controlling a conveying speed of the traction conveyor based on the weight per unit length of the rubber material measured by the first weight measuring device and the second weight measuring device, The manufacturing apparatus of the sheet-like rubber material includes a second cooling device for cooling the rubber material after being measured by the second weight measuring device, the second cooling device having a cooling capacity greater than that of the first cooling device.

6. The manufacturing device of the sheet-like rubber material according to claim 5, wherein: The apparatus for producing a sheet-like rubber material includes a cutting device for cutting the rubber material cooled by the second cooling device into a predetermined length.

7. The manufacturing device of the sheet-like rubber material according to claim 6, wherein: The manufacturing apparatus of the sheet-like rubber material includes a third weight measuring device for measuring the weight of the rubber material cut by the cutting device.

8. The manufacturing device of the sheet-like rubber material according to claim 7, wherein: The second weight measuring device is disposed at a position of 15% to 35% of a stroke length between the extruder and the third weight measuring device on the downstream side from the extruder in the conveying direction.

9. A method for producing a sheet-like rubber material, which is used to produce an unvulcanized sheet-like rubber material, wherein: The method for manufacturing the sheet-like rubber material comprises: The step of continuously extruding the rubber material from an extruder; a step of receiving the rubber material extruded from the extruder by a traction conveyor and conveying the rubber material to a downstream side in a conveying direction; a first measuring step of measuring the weight per unit length of the rubber material during transportation by the traction conveyor; a step of cooling the rubber material after being measured in the first measuring step; a second measuring step of measuring the weight per unit length of the rubber material after cooling in the cooling step; and a step of controlling a conveying speed of the traction conveyor based on the weight per unit length of the rubber material measured in the first measuring step and the second measuring step, Between the cooling step and the second measuring step, the cooled rubber material is conveyed while being tilted upward toward the downstream side in the conveying direction.

10. A method for producing a sheet-like rubber material, which is used to produce an unvulcanized sheet-like rubber material, wherein: The method for manufacturing the sheet-like rubber material comprises: The step of continuously extruding the rubber material from an extruder; a step of receiving the rubber material extruded from the extruder by a traction conveyor and conveying the rubber material to a downstream side in a conveying direction; a first measuring step of measuring the weight per unit length of the rubber material during transportation by the traction conveyor; a step of cooling the rubber material after being measured in the first measuring step; a second measuring step of measuring the weight per unit length of the rubber material after cooling in the cooling step; and a step of controlling a conveying speed of the traction conveyor based on the weight per unit length of the rubber material measured in the first measuring step and the second measuring step, The method for producing a sheet-like rubber material further includes a step of cooling the rubber material measured in the second measuring step.

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