JP7218583B2 - Tire sheet manufacturing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sheet manufacturing apparatus used when manufacturing tires.

In the production of tires, a belt-like sheet made of unvulcanized rubber is used in the molding process. This sheet is cut to size and wound onto a drum or rigid core. As a result, tire components 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 sheets, which are then pressed together to form hot unvulcanized rubber sheets (uncooled sheets). In this uncooled sheet, one of the front side and the back side is made of the first unvulcanized rubber, and the other is made of the second unvulcanized rubber. The first unvulcanized rubber and the second unvulcanized rubber may be the same rubber composition or may be different rubber compositions.

The uncooled sheet formed in the rolling mill is cooled in a cooler to obtain a sheet. In order to suppress variations in sheet dimensions due to contraction of the rubber during cooling, the uncooled sheet is quickly cooled by being moved, for example, on a plurality of cooling drums in a cooler. This sheet is wound around a roller and stored, or sent to the next step as it is. A study on a sheet manufacturing method is disclosed in JP-A-2008-137361.

Japanese Patent Application Laid-Open No. 2008-137361

The length of the route through which the first unvulcanized rubber is fed to the rolling mill and the length of the route through which the second unvulcanized rubber is fed into the rolling mill are usually different. Therefore, even if the first unvulcanized rubber and the second unvulcanized rubber are kneaded at the same temperature, these temperatures differ when they are supplied to the rolling mill. For example, the difference between these temperatures can be 5° C. or more. Therefore, in an uncooled sheet formed using these materials, the front side and the back side have different temperatures. Also in the sheet obtained by cooling this uncooled sheet, the temperature is different between the front side and the back side. This temperature difference causes a difference in adhesive strength between the front side and the back side of the sheet. This temperature difference results in a difference in shrinkage between the front side and the back side of the sheet, and can affect the dimensional accuracy of the sheet. In order to reduce the manufacturing defect rate of tires, there is a demand for a manufacturing apparatus capable of manufacturing a sheet in which the temperature difference between the front side and the back side is suppressed.

SUMMARY OF THE INVENTION 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 and the back side is suppressed.

The present invention relates to a sheet manufacturing apparatus used in a tire molding process. This manufacturing apparatus comprises a rolling mill for forming a belt-shaped uncooled sheet from hot unvulcanized rubber, and a cooler for cooling the uncooled sheet to obtain a sheet. The cooler comprises at least one first cooling drum in which a cooling liquid flows and the back surface of the uncooled sheet can be moved while being in contact with the outer surface thereof, and a cooling liquid in which the front surface of the uncooled sheet flows. at least one second cooling drum which can be moved in contact with its outer surface. The flow rate of the coolant 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 includes a temperature measuring instrument for measuring the temperature of the front side surface and the back side surface of the sheet, and from the measurement results, the flow rate of the cooling liquid flowing to the first cooling drum and the cooling liquid flowing to the second cooling drum. and a controller capable of independently controlling the flow rate of

Preferably, the device includes a temperature measuring instrument for measuring the temperature of the front side surface and the back side surface of the uncooled sheet, and from the measurement results, 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. It further comprises a controller capable of independently controlling the flow rate of the coolant.

Preferably, the flow rate of the coolant flowing through the cooler is 200 L/min or more and 600 L/min or less.

Preferably, the apparatus further comprises a clarifier for removing foreign matter in the coolant.

Preferably, the apparatus further comprises a sterilizer for sterilizing the coolant.

Preferably, the device further comprises a monitor for monitoring the quality of the coolant.

TECHNICAL FIELD The present invention relates to a method for manufacturing a sheet used in a tire molding process. This manufacturing method
(A) forming an uncooled sheet from hot unvulcanized rubber; and (B) at least one first cooling drum having a cooling liquid flowing therein and at least one second cooling drum having a cooling liquid flowing therein. moving the uncooled sheet so that the back surface of the uncooled sheet is in contact with the outer surface of the first cooling drum and the front surface of the uncooled sheet is in contact with the outer surface of the second cooling drum. cooling the uncooled sheet to obtain a sheet. In the step (B), the flow rate of the cooling liquid flowed to the first cooling drum and the flow rate of the cooling liquid flowed to the second cooling drum so as to reduce the temperature difference between the front side surface and the back side surface of the sheet. are individually controlled.

Preferably, the above method includes, after step (B) above,
(C) further comprising a step of measuring the temperatures of the front side and the back side of the sheet;
In the step (B), the flow rate of the cooling liquid flowing to the cooling drum that contacts the surface with the higher temperature of the front surface and the back surface of the sheet is increased, and the cooling that contacts the surface with the lower temperature is performed. At least one of reducing the flow of coolant through the drum is performed.

Preferably, in the above method, between the step (A) and the step (B),
(D) further comprising a step of measuring the temperature of the front side surface and the back side surface of the uncooled sheet;
In the above step (B), the flow rate of the cooling liquid flowing to the cooling drum that contacts the higher temperature surface of the front side surface and the back side surface of the uncooled sheet is changed to the cooling drum that contacts the lower temperature surface. greater than the flow rate of the coolant flowing through the

In the sheet manufacturing apparatus according to the present invention, the flow rate of the cooling liquid flowing to the first cooling drum that contacts the back surface of the uncooled sheet and the flow rate of the cooling liquid that flows to the second cooling drum that contacts the front surface of the uncooled sheet and can be individually controlled. To individually and properly control the flow rate of a cooling liquid flowing to a first cooling drum and the flow rate of a cooling liquid flowing to a second cooling drum even when there is a temperature difference between the back side and the front side of an uncooled sheet. Thus, the temperature difference between the back side and the front side of the sheet can be reduced. This manufacturing apparatus can manufacture a sheet with a small temperature difference between the front side and the back side.

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

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

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 forward, and the opposite direction is backward. The vertical direction is the direction perpendicular to the plane of the paper. 2 is a cross-sectional view of a portion of the device shown in FIG. 1; FIG. In FIG. 2, the direction indicated by the arrow X is forward, and the opposite direction is backward. The direction indicated by the arrow Z is upwards and the opposite is downwards. This apparatus 2 comprises a rolling mill 4 , a cooler 6 , a temperature measuring device 8 , a controller 10 , a clarifier 12 , a sterilizer 14 and a monitor 16 .

This apparatus forms a sheet 20 from hot unvulcanized rubber 18 . In this embodiment, the materials are the first unvulcanized rubber 18a and the second unvulcanized rubber 18b. These unvulcanized rubbers 18 and sheets 20 are also shown in FIGS. Although not shown, the first unvulcanized rubber 18a is kneaded by a feed mill and conveyed to this manufacturing apparatus 2 by a first conveyor. The second unvulcanized rubber 18b is kneaded by a feed mill and conveyed to this manufacturing apparatus 2 by a second conveyor. The temperature of these unvulcanized rubbers 18 is typically 60°C to 90°C. These unvulcanized rubbers 18 contain 5 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 has 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, a first unvulcanized rubber 18a is fed between a first roll 22a and a second roll 22b. By rotating the first roll 22a and the second roll 22b in the direction of the arrow in FIG. 2, the first unvulcanized rubber 18a is passed between the first roll 22a and the second roll 22b. 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. By rotating the third roll 22c and the fourth roll 22d in the direction of the arrow in FIG. 2, the second unvulcanized rubber 18b is passed between the third roll 22c and the fourth roll 22d. 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. As a result, the first unvulcanized rubber 18a and the second unvulcanized rubber 18b are pressure-bonded, and an uncooled sheet 24 made of the hot unvulcanized rubber 18 is obtained. As is clear from FIG. 2, in this embodiment, the uncooled sheet 24 has a front surface made of the first unvulcanized rubber 18a and a back surface 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 overlap in the front-rear direction. In FIG. 1, the first roll 22a and the second roll 22b are drawn so as not to overlap each other for easy viewing.

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

As shown in FIG. 2, when the cooler 6 is viewed from above, the first cooling drum 26a and the second cooling drum 26b overlap in the front-rear direction. In FIG. 1, the first cooling drum 26a and the second cooling drum 26b are drawn so as not to overlap each other for easy viewing.

Each cooling drum 26 is cylindrical. The interior of the cooling drum 26 is hollow. A cooling liquid 32 flows inside the cooling drum 26 . A typical coolant 32 is water. Uncooled sheet 24 contacts the outer surface of cooling drum 26 . As shown in FIG. 2, the back side of the uncooled sheet 24 contacts the outer surface of each first cooling drum 26a, and the front side 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. This rotation moves the uncooled sheet 24 over these cooling drums 26 . Arrow B in FIGS. 1 and 2 represents the direction of movement of uncooled sheet 24 (ie, the direction of movement of sheet 20). The rotation of the cooling drum 26 causes the uncooled sheet 24 to move from front to back. The uncooled sheet 24 is moved while its back surface is in contact with the outer surface of the first cooling drum 26a and its front surface is in contact with the outer surface of the second cooling drum 26b.

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

In FIG. 1, the arrow A indicates the direction in which the coolant 32 flows. Indicated by I1 is the inlet of the coolant 32 to the first channel. The outlet of the cooling liquid 32 from the first channel is indicated by the symbol O1. The cooling liquid 32 enters from this inlet I1, passes through the five first cooling drums 26a in sequence, and is discharged from the outlet O1. Indicated by I2 is the inlet of the coolant 32 to the second flow path. The outlet of the cooling liquid 32 from the second flow path is indicated by O2. The cooling liquid 32 enters from this inlet I2, passes through the five second cooling drums 26b in sequence, and is discharged from the outlet O2.

It should be noted that the connection pipe 28 is drawn thinner than the cooling drum 26 in FIG. 1 for easy viewing. In practice, the connecting tube 28 has sufficient thickness to ensure the required flow rate. For example, the inner diameter of the connecting pipe 28 is made equal to the inner diameter of the cooling drum 26 .

A 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 surface of the sheet 20 . The second temperature measuring device 8b measures the temperature of the back surface of the sheet 20. As shown in FIG. These measurement results are sent to the controller 10 . Typically these temperature measuring devices 8 are infrared thermographers.

Based on the temperature measurement results of the first temperature measuring device 8a and the second temperature measuring device 8b, the controller 10 determines the flow rate of the cooling liquid 32 flowing through each of the first flow path and the second flow path (the 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 through the first cooling drum 26a and the flow rate of the cooling liquid 32 flowing through the second cooling drum 26b.

The clarifier 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. Purifier 12 removes suspended matter in coolant 32 . In this embodiment, clarifier 12 comprises a mesh strainer.

The sterilizer 14 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 sterilizers 14 corresponding to each flow path. The sterilizer 14 sterilizes the coolant 32 to prevent biofilms from occurring in the coolant 32 . In this embodiment, sterilizer 14 is an ultraviolet irradiator.

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

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

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

In the rolling step, the rolling mill 4 is supplied with the high-temperature first unvulcanized rubber 18a and the second unvulcanized rubber 18b. The first roll 22a and the second roll 22b rotate and the first unvulcanized rubber 18a is passed therebetween. The first unvulcanized rubber 18a is rolled into a sheet. Together, the third roll 22c and the fourth roll 22d are rotated, and the second unvulcanized rubber 18b is passed between them. The second unvulcanized rubber 18b is rolled into a sheet. Sheet-like first unvulcanized rubber 18a and second unvulcanized rubber 18b are passed together between second roll 22b and third roll 22c. These are pressed together to obtain a band-shaped uncooled sheet 24 . Uncooled sheet 24 is sent to cooler 6 .

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

As shown in FIG. 1, coolant 32 to the first channel and coolant 32 to the second channel pass through the corresponding purifier 12 and sterilizer 14, respectively, and enter the respective channel inlets. . The cooling liquid 32 that has flowed into the first flow path passes through all the first cooling drums 26a in order and is discharged from the outlet O1. This coolant 32 passes through the monitor 16 and is returned to the first pump. The coolant 32 that has flowed into the second flow path passes through all the second cooling drums 26b in order and is discharged from the outlet O2. This coolant 32 passes through the monitor 16 and is returned to the second pump. These pumps circulate the coolant 32 . In this embodiment, the flow rate of the coolant 32 flowing to the cooler 6 is the sum of the flow rates of these two flow paths, 200 L/min to 600 L/min.

In the cooling process, the coolant 32 is circulated, and the first cooling drum 26a and the second cooling drum 26b rotate in the directions of the arrows in FIG. An uncooled sheet 24 sent from the rolling mill 4 moves in the direction of arrow B on these cooling drums 26 . Uncooled sheets 24 are cooled by moving over these cooling drums 26 . Thereby, the sheet 20 is obtained.

In the cooling process, the controller 10 determines the flow rate V1 and the second flow rate of the cooling liquid 32 sent to the first flow path from the temperature of the front surface and the temperature of the back surface of the sheet 20 measured in the sheet temperature measurement process described later. Controls the flow rate V2 of coolant 32 delivered to the channel. When the temperature of the front surface of the sheet 20 is higher than the temperature of the back surface, the controller 10 reduces the flow rate V1 and/or increases the flow rate V2. By reducing the flow rate V1, the cooling capacity of the first cooling drum 26a becomes smaller, and the temperature of the back surface of the sheet 20 rises. By increasing the flow rate V2, the cooling capacity of the second cooling drum 26b is increased, and the temperature of the front surface of the sheet 20 is lowered. This reduces the difference between the temperature of the front side and the temperature of the back side. When the temperature of the front surface of the sheet 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 process, the temperature measuring device 8 constantly measures the temperatures of the front and back surfaces of the sheet 20 obtained in the cooling process, and sends the result to the controller 10 . The seat temperature measurement process feeds back the cooling result of the cooling process to the cooling process.

The effects of the present invention will be described below.

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

As described above, this apparatus includes a temperature measuring device 8 that measures the temperatures of the front side and back side of the sheet 20 . Based on these measurement results, 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 are adjusted so that the temperature difference between the front side and the back side becomes small. be able to. As a result, the temperature difference between the front side surface and the back side surface of the sheet 20 can be reduced with higher accuracy. In the sheet 20 manufactured by this device, the difference in adhesiveness between the back side and the front side is suppressed. Excellent dimensional accuracy is achieved in the sheet 20 manufactured by this apparatus.

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

The total number of cooling drums 26 is preferably eight or more. By setting the total number of cooling drums 26 to eight or more, the uncooled sheet 24 can be sufficiently cooled by the cooler 6 . With this device, a sheet 20 with good adhesion 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 the cost of the device from increasing.

The flow rate of the coolant 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, a sheet 20 with good adhesion is obtained. The flow rate of the coolant 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 apparatus can be appropriately suppressed. This prevents the cost of the device from increasing.

The device comprises a clarifier 12 . This purifier 12 removes suspended matter in the coolant 32 . This prevents clogging of the cooling drum 26 and connecting tube 28 . This contributes to a stable flow of coolant 32 . In this device, the uncooled sheet 24 is stably cooled. With this apparatus, a sheet 20 with little temperature variation can be obtained. This effectively contributes to reducing variations in adhesive strength of the sheet 20 .

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

This device includes a monitor 16 that monitors the quality of the coolant 32 . From the results of the monitor 16, the time for cleaning the cooler 6 is determined. With this device, the coolant 32 can be replaced and the cooler 6 can be cleaned at appropriate times. With this apparatus, a sheet 20 with little temperature variation can be obtained. This effectively contributes to reducing variations in adhesive strength 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, a sheet 20 with good adhesion 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 coolant 32 sent to the cooler 6 is preferably 30° C. or less. By setting the temperature of the coolant 32 to 30° C. or less, the uncooled sheet 24 can be sufficiently cooled by the cooler 6 . With this device, a sheet 20 with good adhesion is obtained. The temperature of the coolant 32 is preferably 20° C. or higher. By setting the temperature of the cooling liquid 32 to 20° C. or higher, the manufacturing cost can be reduced while achieving sufficient stickiness of the sheet 20 .

In the embodiment described above, the rolling mill 4 rolls the first unvulcanized rubber 18a and the second unvulcanized rubber 18b, respectively, and presses them together to form the uncooled sheet 24 . A cord may be further supplied to this rolling machine 4, and the rolled first unvulcanized rubber 18a and second unvulcanized rubber 18b may be crimped from both sides of this cord. Uncooled sheets, for example for carcasses, are thereby obtained.

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 in order to form the second flow path. were sequentially connected by a connecting tube 28 so as to form a . The method of connecting the first cooling drum 26a and the second cooling drum 26b is not limited to this form. 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 of FIGS. 1-2 except for the temperature measurement device and controller.

The temperature measuring device in this embodiment is located between the rolling mill and the cooler. This temperature measuring instrument 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. A third temperature measuring device measures the temperature of the surface of the uncooled sheet. A fourth temperature measuring device measures the temperature of the back surface of the uncooled sheet. These measurements are sent to the controller. Typically these thermometers are infrared thermographers.

The controller can control the flow rate of the coolant flowing through each of the first flow path and the second flow path from the temperature measurement results of the third temperature measuring device and the fourth temperature measuring device. Based on these measurement results, 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.

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

In the uncooled sheet temperature measuring process, the temperature measuring device always measures the temperature of the front side surface and the back side surface of the uncooled sheet formed in the rolling process, and sends this result to the controller.

In the cooling process, the controller determines the flow rate V1 of the cooling liquid sent to the first flow path and the flow rate V1 of the cooling liquid sent to the second flow path, based on the temperature of the front surface and the temperature of the back surface of the sheet measured in the uncooled sheet temperature measurement step. It controls the flow rate V2 of the coolant to be supplied. When the temperature of the front side of the uncooled sheet is higher than the temperature of the back side, the controller sets the flow rate V2 to be greater 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 of the uncooled sheet can be cooled more strongly than the back side thereof. This reduces the temperature difference between the front side and the back side of the sheet. When the temperature of the front side of the uncooled sheet is lower than the temperature of the back side, the controller sets the flow rate V1 to be greater than the flow rate V2. By doing so, the cooling capacity of the first cooling drum becomes greater than the cooling capacity of the second cooling drum, and the back side of the uncooled sheet can be cooled more strongly than the front side. This reduces the temperature difference between the front side and the back side of the sheet.

This apparatus is equipped with a temperature measuring device for measuring the temperatures of the front side and the back side of the uncooled sheet. Based on 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 and the back side of the sheet after cooling. In the sheet produced by this device, the difference in tackiness between the back side and the front side is suppressed. Excellent dimensional accuracy is achieved in the sheets produced by this apparatus.

Although not shown, in the sheet manufacturing apparatus according to still another embodiment of the present invention, the temperature measuring devices measure the temperature of the front surface and the temperature of the back surface of the sheet, and the temperature of the front surface and the temperature of the back surface of the uncooled sheet. Measure the temperature. This controller determines the flow rate of the coolant flowing to the first cooling drum and the temperature of the back side of the sheet and the temperature of the front side and the back side of the uncooled sheet. The coolant flow rate can be independently controlled. As a result, the temperature difference between the front side surface and the back side surface of the cooled sheet can be reduced with higher accuracy.

Although not shown, a 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 flow rate of the cooling liquid that flows through the first cooling drum and the flow rate of the cooling liquid that flows through the second cooling drum are individually controlled by the device administrator, for example, based on past production results. As a result, the temperature difference between the front side surface and the back side surface of the cooled sheet can be reduced.

The effects of the present invention will be clarified by examples below, but the present invention should not be construed in a limited manner based on the description of these examples.

Sheets were produced using the apparatus shown in FIGS. The parameters for this fabrication 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 to the first cooling drum and the flow rate of the cooling liquid flowing to the second cooling drum were fixed as shown in Table 1. The moving speed of the uncooled sheet was 40 m/min. The time that the uncooled sheet was cooled by the cooler was 25 seconds. The thickness of the obtained sheet was 1.6 mm.

[Comparative Example 1]
In the apparatus 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 will always be the same. These flow rates were as shown in Table 1. A sheet was produced in the same manner as in Example 1 except for 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. Ten measurement positions were randomly selected within a range of 10 m in length of the sheet. These average temperatures are shown in Table 1. The smaller the difference between the temperature of the front side and the temperature of the back side, the better.

As shown in Table 1, the production methods of Examples are superior to the production methods of Comparative Examples. From this evaluation result, the superiority of the present invention is clear.

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

DESCRIPTION OF SYMBOLS 2... Manufacturing apparatus 4... Rolling mill 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 Calendar 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,
An uncooled belt-shaped surface made of the first unvulcanized rubber on the front side and the second unvulcanized rubber on the back side from the high-temperature unvulcanized rubber containing the first unvulcanized rubber and the second unvulcanized rubber A rolling mill for forming a sheet and a cooler for cooling the uncooled sheet to obtain a sheet,
The cooler comprises at least one first cooling drum in which a cooling liquid flows and the back surface of the uncooled sheet can be moved while being in contact with the outer surface thereof, and a cooling liquid in which the front surface of the uncooled sheet flows. at least one second cooling drum that can be moved in contact with the outer surface of the
A sheet manufacturing apparatus capable of independently controlling 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. A temperature measuring instrument for measuring the temperature of the front side surface and the back side surface of the sheet, and based on the measurement result, 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 controlled. 11. The manufacturing apparatus of claim 1, further comprising a controller capable of. A temperature measuring instrument for measuring the temperatures of the front side and the back side of the uncooled sheet, and from the measurement result, 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 separately determined. 3. Manufacturing apparatus according to claim 1 or 2, further comprising a controller capable of controlling the 4. The manufacturing apparatus according to any one of claims 1 to 3, wherein a flow rate of the coolant flowing through the cooler is 200 L/min or more and 600 L/min or less. 5. The manufacturing apparatus according to any one of claims 1 to 4, further comprising a purifier for removing foreign matter in said coolant. The manufacturing apparatus according to any one of claims 1 to 5, further comprising a sterilizer that sterilizes the coolant. 7. The manufacturing apparatus according to any one of claims 1 to 6, further comprising a monitor for monitoring the liquid quality of said cooling liquid. A method for manufacturing a sheet used in a tire molding process,
(A) A high-temperature unvulcanized rubber containing a first unvulcanized rubber and a second unvulcanized rubber, an unvulcanized rubber having a front side made of the first unvulcanized rubber and a back side made of the second unvulcanized rubber forming a cooling sheet; and (B) a cooler comprising at least one first cooling drum in which a cooling liquid flows and at least one second cooling drum in which a cooling liquid flows, the backside of the uncooled sheet. cooling the uncooled sheet by moving the uncooled sheet such that the surface is in contact with the outer surface of the first cooling drum and the front surface of the uncooled sheet is in contact with the outer surface of the second cooling drum; including the step of obtaining a sheet;
In the step (B), the flow rate of the cooling liquid flowed to the first cooling drum and the flow rate of the cooling liquid flowed to the second cooling drum so as to reduce the temperature difference between the front side surface and the back side surface of the sheet. A sheet manufacturing method that individually controls After the step of (B) above,
(C) further comprising a step of measuring the temperatures of the front side and the back side of the sheet;
In the step (B), the flow rate of the cooling liquid flowing to the cooling drum that contacts the surface with the higher temperature among the front surface and the back surface of the sheet is increased, and the cooling that contacts the surface with the lower temperature is performed. 9. The method of claim 8, wherein at least one of reducing the flow rate of coolant through the drum is performed. Between the above step (A) and the above step (B),
(D) further comprising a step of measuring the temperature of the front side surface and the back side surface of the uncooled sheet;
In the above step (B), the flow rate of the cooling liquid flowing to the cooling drum that contacts the higher temperature surface of the front side surface and the back side surface of the uncooled sheet is changed to the cooling drum that contacts the lower temperature surface. 10. The manufacturing method according to claim 8 or 9, wherein the flow rate is higher than that of the cooling liquid flowing through.

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