JP2020110966A - Tire sheet manufacturing apparatus - Google Patents

Abstract

To provide a manufacturing apparatus capable of manufacturing a sheet in which a temperature difference between a front surface and a back surface is suppressed.SOLUTION: The present invention relates to a manufacturing apparatus 2 for a sheet 20 used in a tire molding process. The manufacturing apparatus 2 includes a rolling mill 4 that forms a belt-shaped uncooled sheet 24 from a high-temperature unvulcanized rubber 18, and a cooler that cools the uncooled sheet 24 to obtain a sheet 20. The cooler has at least one first cooling drum 26a capable of moving while a cooling liquid 32 flows inside and a back surface of the uncooled sheet 24 contacts an outer surface thereof, and at least one second cooling drum 26b in which the cooling liquid 32 flows and a front surface of the uncooled sheet 24 can be moved while contacting an outer surface thereof. A flow rate of the cooling liquid 32 flowing through the first cooling drum 26a and a flow rate of the cooling liquid 32 flowing through the second cooling drum 26b can be individually controlled.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sheet manufacturing apparatus used for manufacturing a tire.

In the production of tires, a belt-shaped sheet made of unvulcanized rubber is used in the molding process. This sheet is cut to size and rolled onto a drum or rigid core. As a result, tire constituent members such as an inner liner and a carcass are formed.

In a typical sheet production, a hot first unvulcanized rubber and a hot second unvulcanized rubber are fed to a rolling mill. In the rolling mill, the first unvulcanized rubber and the second unvulcanized rubber are each rolled into a sheet shape, which is further pressure-bonded to form a high-temperature unvulcanized rubber sheet (uncooled sheet). In this uncooled sheet, one of the front side surface and the back side surface is formed of the first unvulcanized rubber and the other is formed of the second unvulcanized rubber. The first unvulcanized rubber and the second unvulcanized rubber may have the same rubber composition or different rubber compositions.

The uncooled sheet formed by the rolling mill is cooled by the cooler to obtain the sheet. In order to suppress the variation in sheet size due to the contraction of the rubber during cooling, the uncooled sheet is quickly cooled by being moved on, for example, a plurality of cooling drums in the cooler. This sheet is wound on a roller and stored, or is sent to the next step as it is. A study on a method of manufacturing a sheet is disclosed in Japanese Patent Laid-Open No. 2008-137361.

JP 2008-137361 A

The path length until the first unvulcanized rubber is supplied to the rolling mill and the path length until the second unvulcanized rubber is supplied to the rolling mill are usually different. Therefore, even if the first unvulcanized rubber and the second unvulcanized rubber are kneaded at the same temperature, when they are supplied to the rolling mill, these temperatures are different. For example, the temperature difference between them may be 5° C. or more. Therefore, in the uncooled sheet formed by using these, the temperature is different between the front side surface and the back side surface. Also in the sheet obtained by cooling this uncooled sheet, the temperature is different between the front side surface and the back side surface. This temperature difference causes a difference in adhesive force between the front surface and the back surface of the sheet. This temperature difference causes a difference in shrinkage amount between the front side surface and the back side surface of the sheet, and may affect the dimensional accuracy of the sheet. In order to reduce the manufacturing defect rate of tires, a manufacturing apparatus capable of manufacturing a sheet in which the temperature difference between the front side surface and the back side surface is suppressed is required.

An object of the present invention is to provide a manufacturing apparatus capable of manufacturing a sheet in which the temperature difference between the front side surface and the back side surface is suppressed.

The present invention relates to a sheet manufacturing apparatus used in a tire molding process. This manufacturing apparatus includes a rolling mill that forms a belt-shaped uncooled sheet from unvulcanized rubber at a high temperature, and a cooler that cools the uncooled sheet to obtain a sheet. The cooler has at least one first cooling drum in which the cooling liquid flows inside and the back side of the uncooled sheet is in contact with the outer surface thereof, and the cooling liquid flows inside the front side of the uncooled sheet. At least one second cooling drum that can be moved while contacting its outer surface. The flow rate of the cooling liquid flowing through the first cooling drum and the flow rate of the cooling liquid flowing through the second cooling drum can be individually controlled.

Preferably, the device is a temperature measuring device for measuring the temperature of the front and back surfaces of the sheet, and the flow rate of the cooling liquid flowing to the first cooling drum and the cooling liquid flowing to the second cooling drum from the measurement result. The controller further includes a controller capable of controlling the flow rate and

Preferably, the device is a temperature measuring device for measuring the temperature of the front side surface and the back side surface of the uncooled sheet, and the flow rate of the cooling liquid flowing to the first cooling drum and the second cooling drum from the measurement result. It further comprises a controller capable of individually controlling the flow rate of the cooling liquid.

Preferably, the flow rate of the cooling liquid flown in the cooler is 200 L/min or more and 600 L/min or less.

Preferably, the device further includes a purifier that removes foreign matter in the cooling liquid.

Preferably, the device further includes a sterilizer for sterilizing the cooling liquid.

Preferably, the device further includes a monitor for monitoring the quality of the cooling liquid.

The present invention relates to a method for manufacturing a sheet used in a tire molding process. This manufacturing method is
(A) a step of forming an uncooled sheet from high-temperature unvulcanized rubber, and (B) at least one first cooling drum through which the cooling liquid flows, and at least one second cooling drum through which the cooling liquid flows. In the cooler provided, the uncooled sheet is moved so that the back side surface of the uncooled sheet contacts the outer surface of the first cooling drum and the front side surface of the uncooled sheet contacts the outer surface of the second cooling drum. And cooling the uncooled sheet to obtain a sheet. In the step (B), the flow rate of the cooling liquid flowing through the first cooling drum and the flow rate of the cooling liquid flowing through the second cooling drum are set so as to reduce the temperature difference between the front side surface and the back side surface of the sheet. Are controlled individually.

Preferably, the above method comprises, after the step (B),
(C) further comprising a step of measuring the temperature of the front and back sides of the sheet,
In the step (B), increasing the flow rate of the cooling liquid flowing in the cooling drum which comes into contact with the surface having the higher temperature of the front surface and the back surface of the sheet, and the cooling which comes into contact with the surface having the lower temperature. At least one of reducing the flow rate of the cooling liquid flowing to the drum is performed.

Preferably, the above method comprises the following steps (A) and (B):
(D) further comprising a step of measuring the temperature of the front surface and the back surface of the uncooled sheet,
In the step (B), the flow rate of the cooling liquid flowing through the cooling drum, which comes into contact with the surface of the uncooled sheet having a higher temperature, of the front surface and the back surface, is set to the cooling drum which comes into contact with the surface having a lower temperature. More than the flow rate of the cooling liquid flowing through.

The sheet manufacturing apparatus according to the present invention, the flow rate of the cooling liquid flowing to the first cooling drum in contact with the back side of the uncooled sheet, and the cooling liquid flowing to the second cooling drum in contact with the front side of the uncooled sheet. And the flow rate can be controlled individually. Even if there is a temperature difference between the back side and the front side of the uncooled sheet, the flow rate of the cooling liquid flowing to the first cooling drum and the flow rate of the cooling liquid flowing to the second cooling drum are individually and properly controlled. Therefore, the temperature difference between the back side surface and the front side surface of the sheet can be reduced. This manufacturing apparatus can manufacture a sheet having a small temperature difference between the front side surface and the back side surface.

FIG. 1 is a conceptual diagram showing a sheet manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a sectional view showing a part of the manufacturing apparatus of FIG.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

FIG. 1 is a conceptual diagram showing a sheet manufacturing apparatus 2 according to an embodiment of the present invention. In FIG. 1, the direction indicated by the arrow X is the front, and the opposite direction is the rear. The direction perpendicular to the plane of the paper is the vertical direction. 2 is a sectional view showing a part of the device shown in FIG. In FIG. 2, the direction indicated by the arrow X is the front, and the opposite direction is the rear. The direction indicated by the arrow Z is upward and the opposite is downward. The device 2 includes a rolling mill 4, a cooler 6, a temperature measuring device 8, a controller 10, a purifier 12, a sterilizer 14 and a monitor 16.

This apparatus forms the sheet 20 by using the high temperature unvulcanized rubber 18 as a material. In this embodiment, the first unvulcanized rubber 18a and the second unvulcanized rubber 18b are the materials. 1 and 2 also show these unvulcanized rubbers 18 and sheets 20. Although not shown, the first unvulcanized rubber 18a is kneaded by a feed mill and conveyed to the manufacturing apparatus 2 by the first conveyor. The second unvulcanized rubber 18b is kneaded by a feed mill and conveyed to the manufacturing apparatus 2 by the second conveyor. The temperature of these unvulcanized rubbers 18 is typically 60°C to 90°C. These unvulcanized rubbers 18 contain 5 phr to 10 phr of sulfur. The temperature of the formed sheet 20 is typically 20°C to 30°C. In this embodiment, the first unvulcanized rubber 18a and the second unvulcanized rubber 18b are made of the same rubber composition. The first unvulcanized rubber 18a and the second unvulcanized rubber 18b may be made of different rubber compositions.

The rolling mill 4 includes four calender rolls 22, a first roll 22a, a second roll 22b, a third roll 22c, and a fourth roll 22d. As shown in FIG. 2, the first unvulcanized rubber 18a is supplied between the first roll 22a and the second roll 22b. The first unvulcanized rubber 18a is passed between the first roll 22a and the second roll 22b by the rotation of the first roll 22a and the second roll 22b in the direction of the arrow in FIG. The first unvulcanized rubber 18a is rolled into a sheet. The second unvulcanized rubber 18b is supplied between the third roll 22c and the fourth roll 22d. The second unvulcanized rubber 18b is passed between the third roll 22c and the fourth roll 22d by the rotation of the third roll 22c and the fourth roll 22d in the direction of the arrow in FIG. The second unvulcanized rubber 18b is rolled into a sheet. The sheet-shaped first unvulcanized rubber 18a and second unvulcanized rubber 18b are passed together between the second roll 22b and the third roll 22c. Thereby, the 1st unvulcanized rubber 18a and the 2nd unvulcanized rubber 18b are pressure-bonded, and the uncooled sheet 24 which consists of high temperature unvulcanized rubber 18 is obtained. As is apparent from FIG. 2, in this embodiment, the front surface of the uncooled sheet 24 is made of the first unvulcanized rubber 18a and the back surface is made of the second unvulcanized rubber 18b.

As shown in FIG. 2, when the rolling mill 4 is viewed from above, the first roll 22a and the second roll 22b have an overlap in the front-rear direction. In order to make it easy to see in FIG. 1, the first roll 22a and the second roll 22b are drawn so as not to overlap with each other.

The cooler 6 includes a cooling drum 26 and a connecting pipe 28. As shown in FIGS. 1 and 2, a plurality of cooling drums 26 are arranged in parallel. As shown in FIG. 2, in this embodiment, 10 cooling drums 26 are alternately arranged in each of the upper and lower stages. The five cooling drums 26 located on the upper stage side are the first cooling drums 26a, and the five cooling drums 26 located on the lower stage side are the second cooling drums 26b.

As shown in FIG. 2, when the cooler 6 is viewed from the upper side, the first cooling drum 26a and the second cooling drum 26b have an overlap in the front-rear direction. In order to make it easy to see in FIG. 1, the first cooling drum 26a and the second cooling drum 26b are drawn so as not to overlap with each other.

Each cooling drum 26 has a tubular shape. The inside of the cooling drum 26 is hollow. A cooling liquid 32 is flown inside the cooling drum 26. A typical cooling liquid 32 is water. The uncooled sheet 24 contacts the outer surface of the cooling drum 26. As shown in FIG. 2, the back side surface of the uncooled sheet 24 contacts the outer surface of each first cooling drum 26a, and the front side surface of the uncooled sheet 24 contacts the outer surface of each second cooling drum 26b. The cooling drum 26 can rotate in the direction of the arrow in FIG. By this rotation, the uncooled sheet 24 is moved on these cooling drums 26. The arrow B in FIGS. 1 and 2 represents the moving direction of the uncooled sheet 24 (that is, the moving direction of the sheet 20). The rotation of the cooling drum 26 moves the uncooled sheet 24 from the front to the rear. The back surface of the uncooled sheet 24 contacts the outer surface of the first cooling drum 26a, and the front surface of the uncooled sheet 24 moves while contacting the outer surface of the second cooling drum 26b.

The connection pipe 28 connects the cooling drums 26 to each other. The inside of the connecting pipe 28 is hollow. A cooling liquid 32 is flown inside the connection pipe 28. As shown in FIG. 1, all the first cooling drums 26a are connected by a connecting pipe 28, and thereby one flow path of the cooling liquid 32 (referred to as a first flow path) is formed. All the second cooling drums 26b are connected by the connecting pipes 28, thereby forming another flow path of the cooling liquid 32 (referred to as a second flow path).

In FIG. 1, what is indicated by an arrow A is the direction in which the cooling liquid 32 flows. Reference numeral I1 indicates an inlet of the cooling liquid 32 to the first flow path. The outlet of the cooling liquid 32 from the first flow path is indicated by reference numeral O1. The cooling liquid 32 is introduced from the inlet I1, passes through the five first cooling drums 26a in order, and is discharged from the outlet O1. Reference numeral I2 indicates the inlet of the cooling liquid 32 to the second flow path. The outlet of the cooling liquid 32 from the second flow path is indicated by reference numeral O2. The cooling liquid 32 is introduced from the inlet I2, sequentially passes through the five second cooling drums 26b, and is discharged from the outlet O2.

In FIG. 1, the connection pipe 28 is drawn thin with respect to the cooling drum 26 for easy viewing. In practice, the connecting pipe 28 has a sufficient thickness to ensure the required flow rate. For example, the inner diameter of the connection pipe 28 is set equal to the inner diameter of the cooling drum 26.

The temperature measuring device 8 measures the surface temperature of the sheet 20. As shown in FIG. 2, in this embodiment, there is a first temperature measuring device 8a and a second temperature measuring device 8b. The first temperature measuring device 8a measures the temperature of the front side surface of the sheet 20. The second temperature measuring device 8b measures the temperature of the back side surface of the sheet 20. These measurement results are sent to the controller 10. Typically these temperature measuring devices 8 are infrared thermography.

The controller 10 determines, based on the temperature measurement results obtained by the first temperature measuring device 8a and the second temperature measuring device 8b, the flow rate of the cooling liquid 32 flowing in each of the first flow path and the second flow path (cooling liquid flowing per unit time. 32 volume). Based on these measurement results, the controller 10 can individually control the flow rate of the cooling liquid 32 flowing to the first cooling drum 26a and the flow rate of the cooling liquid 32 flowing to the second cooling drum 26b.

The purifier 12 is located upstream of the inlet I1 of the first channel and upstream of the inlet I2 of the second channel. In this embodiment, there are two purifiers 12 corresponding to each flow path. The purifier 12 removes suspended matter in the cooling liquid 32. In this embodiment, the purifier 12 comprises a mesh strainer.

The sterilizer 14 is located upstream of the inlet I1 of the first flow path and upstream of the inlet I2 of the second flow path. In this embodiment, two sterilizers 14 are provided corresponding to each flow path. The sterilizer 14 sterilizes the cooling liquid 32 to prevent a biofilm from being generated in the cooling liquid 32. In this embodiment, the sterilizer 14 is an ultraviolet irradiator.

The monitor 16 is located downstream of the outlet O1 of the first flow path and downstream of the outlet O2 of the second flow path. In this embodiment, there are two monitors 16 for each flow path. The monitor 16 monitors the quality of the cooling liquid 32. The monitor 16 measures the amount of suspended matter in the cooling liquid 32. The timing of cleaning the cooler 6 is determined based on the measurement result of the monitor 16.

In this embodiment, the purifier 12 and the sterilizer 14 are located upstream of the inlet of the flow channel, and the monitor 16 is located downstream of the outlet of the flow channel. The positions of the purifier 12, the sterilizer 14, and the monitor 16 are not limited to this position. The purifier 12 or the sterilizer 14 may be located downstream of the outlet, and the monitor 16 may be located upstream of the inlet.

The method of manufacturing the sheet 20 using this apparatus includes a rolling step, a cooling step, and a sheet temperature measuring step.

In the rolling step, the high temperature first unvulcanized rubber 18a and second unvulcanized rubber 18b are supplied to the rolling mill 4. The first roll 22a and the second roll 22b rotate, and the first unvulcanized rubber 18a is passed between them. The first unvulcanized rubber 18a is rolled into a sheet shape. At the same time, the third roll 22c and the fourth roll 22d rotate, and the second unvulcanized rubber 18b is passed between them. The second unvulcanized rubber 18b is rolled into a sheet. The sheet-shaped first unvulcanized rubber 18a and second unvulcanized rubber 18b are passed together between the second roll 22b and the third roll 22c. These are pressure-bonded to each other to obtain a strip-shaped uncooled sheet 24. The uncooled sheet 24 is sent to the cooler 6.

In the cooling step, the cooling liquid 32 is sent from the first pump (not shown) to the first flow path, and the cooling liquid 32 is also sent to the second flow path from the second pump (not shown). At the start of operation of this device, the flow rate V1 of the cooling liquid 32 sent to the first flow path and the flow rate V2 of the cooling liquid 32 sent to the second flow path are set to predetermined values. The flow rate V1 is the flow rate of the cooling liquid 32 flown to the first cooling drum 26a, and the flow rate V2 is the flow rate of the cooling liquid 32 flown to the second cooling drum 26b. The flow rates V1 and V2 are determined from the temperature data obtained by, for example, making a prototype of the sheet 20.

As shown in FIG. 1, the cooling liquid 32 to the first flow path and the cooling liquid 32 to the second flow path pass through the corresponding purifier 12 and sterilizer 14, respectively, and enter the inlet of each flow path. .. The cooling liquid 32 flowing into the first flow path sequentially passes through all the first cooling drums 26a and is discharged from the outlet O1. The cooling liquid 32 passes through the monitor 16 and is returned to the first pump. The cooling liquid 32 flowing into the second flow path sequentially passes through all the second cooling drums 26b and is discharged from the outlet O2. The cooling liquid 32 passes through the monitor 16 and is returned to the second pump. The cooling liquid 32 is circulated by these pumps. In this embodiment, the flow rate of the cooling liquid 32 that is passed through the cooler 6 is 200 L/min to 600 L/min in total of the flow rates of these two flow paths.

In the cooling process, the cooling liquid 32 is circulated, and each of the first cooling drum 26a and the second cooling drum 26b rotates in the direction of the arrow in FIG. The uncooled sheet 24 sent from the rolling mill 4 moves on these cooling drums 26 in the direction of arrow B. The uncooled sheet 24 is cooled by moving on these cooling drums 26. As a result, the sheet 20 is obtained.

In the cooling step, the controller 10 controls the flow rate V1 and the second flow rate of the cooling liquid 32 sent to the first flow path based on the temperatures of the front surface and the back surface of the sheet 20 measured in the sheet temperature measuring step described later. The flow rate V2 of the cooling liquid 32 sent to the passage is controlled. When the temperature of the front side surface of the seat 20 is higher than the temperature of the back side surface, the controller 10 performs either one or both of the decrease of the flow rate V1 and the increase of the flow rate V2. By reducing the flow rate V1, the cooling capacity of the first cooling drum 26a is reduced, and the temperature of the back side surface of the sheet 20 is increased. By increasing the flow rate V2, the cooling capacity of the second cooling drum 26b increases and the temperature of the front surface of the sheet 20 decreases. As a result, the difference between the temperature of the front surface and the temperature of the back surface becomes small. When the temperature of the front surface of the seat 20 is lower than the temperature of the back surface, the controller 10 increases the flow rate V1 and/or decreases the flow rate V2.

In the sheet temperature measuring step, the temperature measuring device 8 constantly measures the temperatures of the front and back surfaces of the sheet 20 obtained in the cooling step, and sends the result to the controller 10. The sheet temperature measuring step feeds back the cooling result in the cooling step to the cooling step.

The effects of the present invention will be described below.

The manufacturing apparatus 2 for the sheet 20 according to the present invention is configured so that the flow rate of the cooling liquid 32 that flows in the first cooling drum 26a that contacts the back surface of the uncooled sheet 24 and the second cooling that contacts the front surface of the uncooled sheet 24. The flow rate of the cooling liquid 32 that flows through the drum 26b can be individually controlled. Even if there is a temperature difference between the back side surface and the front side surface of the uncooled sheet 24, the flow rate of the cooling liquid 32 passed through the first cooling drum 26a and the flow rate of the cooling liquid 32 passed through the second cooling drum 26b are individually set. The temperature difference between the back side surface and the front side surface of the sheet 20 can be reduced by appropriately controlling the temperature. In the sheet 20 manufactured by this device, the difference in adhesiveness between the back side surface and the front side surface is suppressed. The sheet 20 manufactured by this apparatus has excellent dimensional accuracy.

As described above, this device includes the temperature measuring device 8 that measures the temperatures of the front surface and the back surface of the sheet 20. From these measurement results, the flow rate of the cooling liquid 32 flown to the first cooling drum 26a and the flow rate of the cooling liquid 32 flown to the second cooling drum 26b are adjusted so that the temperature difference between the front side surface and the back side surface becomes small. be able to. Thereby, the temperature difference between the front side surface and the back side surface of the sheet 20 can be reduced more accurately. In the sheet 20 manufactured by this device, the difference in adhesiveness between the back side surface and the front side surface is suppressed. The sheet 20 manufactured by this apparatus has excellent dimensional accuracy.

As described above, this device includes the controller 10 that controls the flow rates V1 and V2 from the temperatures of the front and back surfaces of the seat 20. By controlling the flow rates V1 and V2 so that the controller 10 reduces the temperature difference between the front and back sides, the temperature difference between the front and back sides of the seat 20 can be efficiently reduced. With this manufacturing apparatus 2, the difference in adhesiveness between the back side surface and the front side surface is suppressed, and the sheet 20 having excellent dimensional accuracy can be efficiently manufactured.

The total number of cooling drums 26 is preferably 8 or more. By setting the total number of the cooling drums 26 to 8 or more, the uncooled sheet 24 can be sufficiently cooled by the cooler 6. With this device, the sheet 20 having good adhesiveness is obtained. The number of cooling drums 26 is preferably 12 or less. By setting the number of cooling drums 26 to 12 or less, the scale of the apparatus can be appropriately suppressed. This prevents an increase in the cost of the device.

The flow rate of the cooling liquid 32 is preferably 200 L/min or more as described above. By setting the flow rate of the cooling liquid 32 to 200 L/min or more, the uncooled sheet 24 is effectively cooled. With this device, the sheet 20 having good adhesiveness is obtained. The flow rate of the cooling liquid 32 is preferably 600 L/min or less. By setting the flow rate of the cooling liquid 32 to 600 L/min or less, the scale of the device can be appropriately suppressed. This prevents an increase in the cost of the device.

The device comprises a purifier 12. The purifier 12 removes suspended matter in the cooling liquid 32. This prevents clogging of the cooling drum 26 and the connecting pipe 28. This contributes to a stable flow of the cooling liquid 32. In this device, the uncooled sheet 24 is cooled stably. With this apparatus, the sheet 20 having a small temperature variation can be obtained. This effectively contributes to reducing the variation in the adhesive force of the sheet 20.

The device comprises a sterilizer 14. By sterilizing the cooling liquid 32 with the sterilizer 14, generation of a biofilm in the cooling liquid 32 is prevented. This prevents clogging of the cooling drum 26 and the connecting pipe 28. This contributes to a stable flow of the cooling liquid 32. In this device, the uncooled sheet 24 is cooled stably. With this apparatus, the sheet 20 having a small temperature variation can be obtained. This effectively contributes to reducing the variation in the adhesive force of the sheet 20.

This device includes a monitor 16 that monitors the quality of the cooling liquid 32. From the result of the monitor 16, the time for cleaning the cooler 6 is determined. In this device, the cooling liquid 32 can be replaced and the cooler 6 can be washed at an appropriate time. With this apparatus, the sheet 20 having a small temperature variation can be obtained. This effectively contributes to reducing the variation in the adhesive force of the sheet 20.

The moving speed of the uncooled sheet 24 is preferably 60 m/min or less. By setting the moving speed of the uncooled sheet 24 to 60 m/min or less, the uncooled sheet 24 can be sufficiently cooled by the cooler 6. With this device, the sheet 20 having good adhesiveness is obtained. The moving speed of the uncooled sheet 24 is preferably 30 m/min or more. By setting the moving speed to 30 m/min or more, the uncooled sheet 24 can be efficiently cooled. This contributes to improved productivity.

The temperature of the cooling liquid 32 sent to the cooler 6 is preferably 30° C. or lower. By setting the temperature of the cooling liquid 32 to 30° C. or lower, the uncooled sheet 24 can be sufficiently cooled by the cooler 6. With this device, the sheet 20 having good adhesiveness is obtained. The temperature of the cooling liquid 32 is preferably 20° C. or higher. By setting the temperature of the cooling liquid 32 to 20° C. or higher, sufficient adhesiveness of the sheet 20 can be realized and the manufacturing cost can be suppressed.

In the embodiment described above, the rolling mill 4 rolls the first unvulcanized rubber 18a and the second unvulcanized rubber 18b, respectively, and press-bonds these to form the uncooled sheet 24. A cord may be further supplied to the rolling mill 4, and the first unvulcanized rubber 18a and the second unvulcanized rubber 18b rolled from both sides of the cord may be pressure bonded. Uncooled sheets, for example for carcasses, are obtained thereby.

In the cooler 6 of the embodiment described above, all the first cooling drums 26a are sequentially connected by the connecting pipes 28 so as to form the first flow path, and all the second cooling drums 26b are connected to the second flow path. Are connected in order by connecting pipe 28 so as to form The method of connecting the first cooling drum 26a and the second cooling drum 26b is not limited to this mode. Any connection method may be used as long as the flow rate of the cooling liquid 32 flowing to the first cooling drum 26a and the flow rate of the cooling liquid 32 flowing to the second cooling drum 26b can be individually controlled.

Although not shown, a sheet manufacturing apparatus according to another embodiment of the present invention includes a rolling mill, a cooler, a temperature measuring device, a controller, a purifier, a sterilizer, and a monitor. This manufacturing apparatus is the same as the manufacturing apparatus 2 in FIG. 1-2 except for the temperature measuring device and the controller.

The temperature measuring device of this embodiment is located between the rolling mill and the cooler. This temperature measuring device measures the surface temperature of the uncooled sheet. In this embodiment, there are two temperature measuring devices, a third temperature measuring device and a fourth temperature measuring device. The third temperature measuring device measures the temperature of the front surface of the uncooled sheet. The fourth temperature measuring device measures the temperature of the back side surface of the uncooled sheet. These measurement results are sent to the controller. Typically these thermometers are infrared thermographs.

The controller can control the flow rate of the cooling liquid flowing through each of the first flow path and the second flow path based on the temperature measurement results obtained by the third temperature measurement device and the fourth temperature measurement device. The controller can individually control the flow rate of the cooling liquid flowing through the first cooling drum and the flow rate of the cooling liquid flowing through the second cooling drum based on these measurement results.

A sheet manufacturing method using this apparatus includes a rolling step, an uncooled sheet temperature measuring step, and a cooling step. The rolling process is the same as the rolling process described above.

In the uncooled sheet temperature measuring step, the temperature measuring device constantly measures the temperatures of the front and back surfaces of the uncooled sheet formed in the rolling step, and sends the result to the controller.

In the cooling process, the controller sends the flow rate V1 of the cooling liquid sent to the first flow path and the second flow path from the temperature of the front side surface and the temperature of the back side surface of the sheet measured in the uncooled sheet temperature measurement step. The flow rate V2 of the cooling liquid to be controlled is controlled. When the temperature of the front side surface of the uncooled sheet is higher than the temperature of the back side surface, the controller sets the flow rate V2 to be larger than the flow rate V1. By making the flow rate V2 larger than the flow rate V1, the cooling capacity of the second cooling drum becomes larger than that of the first cooling drum, and the front side surface of the uncooled sheet can be cooled more strongly than the back side surface. As a result, the temperature difference between the front side surface and the back side surface of the sheet becomes small. When the temperature of the front surface of the uncooled sheet is lower than the temperature of the back surface, the controller sets the flow rate V1 to be larger than the flow rate V2. By doing so, the cooling capacity of the first cooling drum becomes larger than the cooling capacity of the second cooling drum, and the back side surface of the uncooled sheet can be cooled more strongly than the front side surface. As a result, the temperature difference between the front side surface and the back side surface of the sheet becomes small.

This device is equipped with a temperature measuring device that measures the temperatures of the front and back surfaces of the uncooled sheet. From these measurement results, the flow rate V1 of the first flow path and the flow rate V2 of the second flow path can be adjusted so that the temperature difference between the front side surface and the back side surface becomes small. This makes it possible to more accurately reduce the temperature difference between the front side surface and the back side surface of the sheet after cooling. In the sheet manufactured by this device, the difference in adhesiveness between the back side surface and the front side surface is suppressed. Excellent dimensional accuracy has been realized in the sheet manufactured by this apparatus.

Although not shown, in the sheet manufacturing apparatus according to still another embodiment of the present invention, the temperature measuring device includes a front surface temperature and a back surface temperature of the sheet, and a front surface temperature and a back surface temperature of the uncooled sheet. Measure the temperature. The controller controls the flow rate of the cooling liquid flowing to the first cooling drum and the flow rate to the second cooling drum from the temperatures of the front and back sides of the sheet and the temperatures of the front and back sides of the uncooled sheet. The flow rate of the cooling liquid can be controlled individually. This makes it possible to more accurately reduce the temperature difference between the front side surface and the back side surface of the sheet after cooling.

Although not shown, the sheet manufacturing apparatus according to still another embodiment of the present invention does not include a temperature measuring device and a controller. In this device, the administrator of the device individually controls the flow rate of the cooling liquid that flows in the first cooling drum and the flow rate of the cooling liquid that flows in the second cooling drum, for example, based on the past production record. Thereby, the temperature difference between the front side surface and the back side surface of the sheet after cooling can be reduced.

Hereinafter, the effects of the present invention will be clarified by examples, but the present invention should not be limitedly interpreted based on the description of the examples.

Sheets were manufactured using the apparatus shown in FIGS. The parameters in this manufacturing are shown in Table 1. In this manufacturing apparatus, the number of first cooling drums and the number of second cooling drums are each five. In the cooling of this sheet, the flow rate of the cooling liquid flowing through the first cooling drum and the flow rate of the cooling liquid flowing through the second cooling drum were fixed as shown in Table 1. The moving speed of the uncooled sheet was set to 40 m/min. The time for cooling the uncooled sheet with the cooler was 25 seconds. The thickness of the obtained sheet was 1.6 mm.

[Comparative Example 1]
In the device of Comparative Example 1, the flow rate of the cooling liquid flowing through the first cooling drum and the flow rate of the cooling liquid flowing through the second cooling drum cannot be controlled individually. These flow rates are always the same. These flow rates were as shown in Table 1. A sheet was manufactured in the same manner as in Example 1 except these.

[Example 2-4]
Example 2-3 is the same as Example 1 except that the flow rate of the cooling liquid is as shown in Table 1.

[Seat temperature]
The temperature of the front surface and the temperature of the back surface of the sheet immediately after being manufactured were measured. The measurement positions are 10 positions randomly selected within the range of the sheet length of 10 m. These average temperatures are shown in Table 1. The smaller the difference between the temperature on the front side and the temperature on the back side, the better.

As shown in Table 1, the manufacturing method of the example has better results than the manufacturing method of the comparative example. From this evaluation result, the superiority of the present invention is clear.

The apparatus described above can also be applied to the manufacture of different sheets for different tires.

2... Manufacturing apparatus 4... Rolling machine 6... Cooler 8... Temperature measuring device 8a... First temperature measuring device 8b... Second temperature measuring device 10... Controller 12 ... Purifier 14... Sterilizer 16... Monitor 18... Unvulcanized rubber 18a... First unvulcanized rubber 18b... Second unvulcanized rubber 20... Sheet 22... Calender roll 22a... First roll 22b... Second roll 22c... Third roll 22d... Fourth roll 24... Uncooled sheet 26... Cooling drum 26a... -First cooling drum 26b...Second cooling drum 28...Connection pipe

Claims (10)

A sheet manufacturing apparatus used in a tire molding process,
A rolling mill that forms a strip-shaped uncooled sheet from high-temperature unvulcanized rubber, and a cooler that cools this uncooled sheet to obtain a sheet,
The cooler has at least one first cooling drum in which the cooling liquid flows inside and the back side of the uncooled sheet is in contact with the outer surface thereof, and the cooling liquid flows inside the front side of the uncooled sheet. Has at least one second cooling drum that can be moved in contact with its outer surface,
A sheet manufacturing apparatus capable of individually controlling the flow rate of the cooling liquid flown in the first cooling drum and the flow rate of the cooling liquid flown in the second cooling drum. A temperature measuring device for measuring the temperature of the front and back surfaces of the sheet, and individually controlling the flow rate of the cooling liquid flowing to the first cooling drum and the flow rate of the cooling liquid flowing to the second cooling drum from the measurement result. The manufacturing apparatus according to claim 1, further comprising a controllable controller. A temperature measuring device for measuring the temperature of the front surface and the back surface of the uncooled sheet, and the flow rate of the cooling liquid flowing to the first cooling drum and the flow rate of the cooling liquid flowing to the second cooling drum are individually determined based on the measurement results. The manufacturing apparatus according to claim 1 or 2, further comprising a controller capable of controlling. The manufacturing apparatus according to any one of claims 1 to 3, wherein a flow rate of the cooling liquid supplied to the cooler is 200 L/min or more and 600 L/min or less. The manufacturing apparatus according to claim 1, further comprising a purifier that removes foreign matters in the cooling liquid. The manufacturing apparatus according to claim 1, further comprising a sterilizer that sterilizes the cooling liquid. The manufacturing apparatus according to claim 1, further comprising a monitor that monitors the quality of the cooling liquid. A method for manufacturing a sheet used in a tire molding process,
(A) a step of forming an uncooled sheet from high temperature unvulcanized rubber, and (B) at least one first cooling drum through which the cooling liquid flows and at least one second cooling drum through which the cooling liquid flows. In the cooler provided, the uncooled sheet is moved so that the back side surface of the uncooled sheet contacts the outer surface of the first cooling drum and the front side surface of the uncooled sheet contacts the outer surface of the second cooling drum. Including the step of cooling the uncooled sheet to obtain a sheet,
In the step (B), the flow rate of the cooling liquid flowing through the first cooling drum and the flow rate of the cooling liquid flowing through the second cooling drum are set so as to reduce the temperature difference between the front side surface and the back side surface of the sheet. A method for manufacturing a sheet, in which the sheets are individually controlled. After the step (B) above,
(C) further comprising a step of measuring the temperature of the front and back sides of the sheet,
In the step (B), increasing the flow rate of the cooling liquid flowing in the cooling drum which comes into contact with the surface having the higher temperature of the front surface and the back surface of the sheet, and the cooling which comes into contact with the surface having the lower temperature. 9. The manufacturing method according to claim 8, wherein at least one of reducing the flow rate of the cooling liquid flowing through the drum is performed. Between the step (A) and the step (B),
(D) further comprising a step of measuring the temperature of the front surface and the back surface of the uncooled sheet,
In the step (B), the flow rate of the cooling liquid flowing through the cooling drum, which comes into contact with the surface of the uncooled sheet having the higher temperature, of the front surface and the back surface of the uncooled sheet, The manufacturing method according to claim 8 or 9, wherein the flow rate of the cooling liquid flowing through the flow path is higher than that of the cooling liquid flowing through the flow path.

Images