JP7433026B2 - Forming roll temperature control device - Google Patents

Description

The present invention relates to a temperature control device for a forming roll, and more particularly, to a temperature control device for a forming roll that cools the forming roll with cooling water.

BACKGROUND ART Some forming rolls that transport a processed product such as a resin sheet or film (hereinafter simply referred to as a sheet) while forming it are configured so that the temperature of the forming roll can be adjusted. Such forming rolls are equipped with means for heating and cooling so that the temperature can be adjusted. For example, in the roller temperature control device described in Patent Document 1, a dielectric heating jacket roller used as a forming roll is equipped with a coil for causing the roller to generate heat by electromagnetic induction and a U-shaped pipe through which cooling water flows. The temperature of the roller can be adjusted by adjusting the heat generated by electromagnetic induction in the coil and the cooling caused by flowing cooling water. Furthermore, in the temperature control device for a heat treatment roller described in Patent Document 2, the roller used as the forming roll is formed with a heat medium flow path through which a heat medium used as a heat medium passes, and the roller is heated or cooled. The temperature of the roller can be adjusted by allowing the oil to flow through the heat medium passage.

Japanese Unexamined Patent Publication No. 54-43349 Japanese Patent Application Publication No. 2004-195888

Here, to adjust the temperature of the forming roll, a fluid such as oil or water is used as a heat medium, and the temperature is adjusted by flowing the heat medium into the roll and exchanging heat with the roll. However, since oil has a smaller specific heat than water, when oil is used as a heating medium, it is necessary to increase the flow rate. For this reason, water, which can exchange heat with the rolls even at a lower flow rate than oil, is used as a heating medium to adjust the temperature of the rolls by exchanging heat with the rolls. is preferred. Water has a higher specific heat than oil, so it is easier to exchange heat with the rolls, and its viscosity is lower than oil, so water is more effective than oil when flowing through the heat medium flow path. It is easy to flow through the channel. Therefore, when water is used as a heating medium, heat exchange can be performed efficiently between the water as a heating medium and the roll, and even when forming at high speed (large extrusion mass), the forming roll can be used with high precision. temperature can be adjusted.

However, water has a lower boiling point than oil, so when water is used as a heat medium for heat exchange with the rolls, the temperature exceeds the boiling point when heat exchanges with the high temperature rolls. There is a possibility that it will become easier. For example, when water is passed as a heat medium through the heat medium flow path formed in the roll in order to cool a forming roll that has become hot, the temperature of the water increases due to heat exchange with the roll, but the water When the temperature of water exceeds its boiling point, water boils and turns into steam. When water boils and turns into steam, its volume rapidly expands, causing problems such as impact noise within the device and the inability to stably operate a pump that flows cooling water. For these reasons, there is room for improvement in order to efficiently exchange heat with the rolls using water as a heat medium and to adjust the temperature of the forming rolls with high precision.

The present invention has been made in view of the above, and an object of the present invention is to provide a temperature control device for forming rolls that can control temperature with higher precision.

In order to solve the above-mentioned problems and achieve the objects, a temperature control device for a forming roll according to the present invention is provided with a heating medium flow path that is a flow path for a heating medium formed therein, and a heating medium flowing through the heating medium flow path. a forming roll capable of exchanging heat with the heating medium; a return path connected to the heating medium flow path through which the heating medium flowing out from the heating medium flow path; and a return path through which the heating medium flows into the heating medium flow path. a heating medium path having an inflow path through which a heating medium flows; a return temperature sensor that detects the temperature of the heating medium flowing through the return path; A flow rate adjustment section that adjusts the flow rate of the heat medium flowing into the heat medium flow path from the path.

The forming roll temperature control device according to the present invention has the effect of being able to perform temperature control with higher precision.

FIG. 1 is a schematic diagram of a molding apparatus according to an embodiment. FIG. 2 is a sectional view of the forming roll according to the embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a sectional view taken along line BB in FIG. FIG. 5 is a schematic diagram showing the configuration of a temperature control device for forming rolls according to an embodiment. FIG. 6 is a modification of the forming roll temperature control device according to the embodiment, and is an explanatory diagram showing a state in which a heat insulating material is arranged in the heat medium flow path.

DESCRIPTION OF EMBODIMENTS Below, embodiments of a temperature control device for forming rolls according to the present disclosure will be described in detail based on the drawings. Note that the present invention is not limited to this embodiment. Further, the constituent elements in the embodiments described below include those that can be replaced and easily conceived by those skilled in the art, or those that are substantially the same.

[Embodiment]
<Forming device 1>
FIG. 1 is a schematic diagram of a molding apparatus 1 according to an embodiment. A molding apparatus 1 shown in FIG. 1 is a molding apparatus 1 to which a temperature control device 100 (see FIG. 5) for a molding roll 30 according to the present embodiment is applied, and for example, a sheet made of a resin material such as a resin film. It is now possible to mold shaped members. The molding device 1 includes an extrusion unit 10 and a molding roll unit 20. The extrusion unit 10 supplies the molten resin material to the forming roll unit 20, and the forming roll unit 20 is a sheet-like member by forming the resin material supplied from the extrusion unit 10 into a sheet shape. It is now possible to mold a molded sheet S.

Among these, the extrusion unit 10 includes an extruder 11 and a T-die 12, and the extruder 11 and the T-die 12 are connected to each other via a connecting pipe 13. The extruder 11 melts and kneads a resin material that is supplied from a raw material supply device (not shown) and is a raw material for the molded sheet S to be molded by the molding device 1. As the extruder 11, a kneading extruder having one or more screws is used. For example, in a twin-screw kneading extruder having two screws, the resin material is stirred by the two screws to form a slurry, and then melt-kneaded. As described above, the extruder 11 performs homogeneous and uniform melt-kneading by stirring the resin material with a screw. The resin material melted and kneaded by the extruder 11 is sent in a molten state to the T-die 12 through the connecting pipe 13.

The T-die 12 can spread and discharge the molten resin material supplied from the extruder 11 into a sheet by discharging it from a slit-shaped discharge port (not shown). The extrusion unit 10 supplies a molten resin material to the forming roll unit 20 in the form of a sheet spread through a T-die 12 .

The forming roll unit 20 includes a first roll 21, a second roll 22, and a third roll 23. The first roll 21, the second roll 22, and the third roll 23 are all formed in a substantially cylindrical shape, and are rotatable about the central axis of the cylinder. That is, the first roll 21, the second roll 22, and the third roll 23 are rotatable about the central axis of the cylinder as rotation axes 21r, 22r, and 23r, respectively.

Further, the first roll 21, the second roll 22, and the third roll 23 have rotating shafts 21r, 22r, and 23r extending in the horizontal direction, and extending directions of the rotating shafts 21r, 22r, and 23r are parallel to each other. It is arranged in the following direction. Furthermore, the first roll 21, the second roll 22, and the third roll 23 are in a positional relationship in which the outer peripheral surfaces of the adjacent rolls are close to each other. They are arranged in order.

Further, the first roll 21, the second roll 22, and the third roll 23 have rotating shafts 21r, 22r, and 23r extending in the longitudinal direction of the discharge port of the T-die 12 formed in a slit shape. It is arranged below the T-die 12 in a parallel orientation. Specifically, in the forming roll unit 20, the portion between the first roll 21 and the second roll 22, that is, the portion where the outer circumferential surface of the first roll 21 and the outer circumferential surface of the second roll 22 are closest, is T. It is arranged below the T-die 12 in a positional relationship below the discharge port of the die 12 . At this time, since the first roll 21 and the second roll 22 are arranged with the extending directions of the rotating shafts 21r and 22r parallel to the longitudinal direction of the discharge port of the T-die 12, the first roll 21 and the second roll 22 are The gap between the outer circumferential surface of the roll 21 and the outer circumferential surface of the second roll 22 is also formed to extend in a direction parallel to the longitudinal direction of the discharge port of the T-die 12 .

Of the first roll 21, second roll 22, and third roll 23 arranged in this way, the first roll 21 and the second roll 22 are located at the portions of their respective outer peripheral surfaces that are opposite to each other. are rotatable in a direction from above to below about rotating shafts 21r and 22r. Further, the third roll 23 has a portion of its outer circumferential surface facing the first roll 21 that is rotatable about the rotating shaft 23r in a direction from below to above.

The resin material supplied from the T-die 12 to the forming roll unit 20 in a sheet-like state is pressed between the outer circumferential surface of the first roll 21 and the outer circumferential surface of the second roll 22. However, as the first roll 21 and the second roll 22 rotate, the paper is conveyed from above to below. The resin material that has passed between the first roll 21 and the second roll 22 is further transferred between the outer circumferential surface of the second roll 22 and the outer circumferential surface of the third roll 23. It is conveyed from below to above as it rotates.

The resin material supplied from the T-die 12 to the forming roll unit 20 is cooled and solidified as it is conveyed while being pressed by the first roll 21, second roll 22, and third roll 23, and becomes the desired shape. It is molded as a thick molded sheet S. The formed sheet S formed by the forming roll unit 20 is conveyed downstream from the forming roll unit 20 to an apparatus, and is appropriately subjected to necessary processing toward the final product.

<Forming roll 30>
FIG. 2 is a sectional view of the forming roll 30 according to the embodiment. The second roll 22 included in the forming roll unit 20 is configured as a forming roll 30 described below. The forming roll 30 is formed in a substantially cylindrical shape, and includes a roll main body part 31 that forms a forming sheet S (see FIG. 1) on an outer circumferential surface 32, and a shaft shape with a smaller diameter than the roll main body part 31. , and roll support portions 33 disposed on both sides of the roll body portion 31 in the axial direction. In the forming roll 30, the roll support parts 33 disposed on both sides in the axial direction of the roll main body part 31 are each supported by outer bearings 51, so that the forming roll 30 is rotatably supported by the outer bearings 51. ing. In this way, the forming roll 30 rotatably supported by the outer bearing 51 is connected to a rotational drive mechanism (not shown) such as a motor, and the forming roll 30 is driven by the driving force given from the rotational drive mechanism. It is rotatable.

Further, the forming roll 30 includes a drive shaft 35 and a fixed shaft 36, and the roll body portion 31 and the roll support portion 33 are parts of the drive shaft 35. In other words, the drive shaft 35 includes the roll body portion 31 and the roll support portion 33, and is rotatable by the driving force applied from the rotational drive mechanism. On the other hand, the fixed shaft 36 is disposed inside the drive shaft 35 in a non-rotatable state.

Specifically, the drive shaft 35 is formed in a substantially cylindrical shape, the fixed shaft 36 is formed in a substantially cylindrical shape whose outer diameter is smaller than the inner diameter of the drive shaft 35, and the central axis of the cylinder is It is arranged inside the drive shaft 35 in a direction that matches the central axis of the cylinder of the drive shaft 35 . Note that these central axes coincide with the rotation axis 22r (see FIG. 1) of the second roll 22 configured as the forming roll 30.

The fixed shaft 36 arranged inside the drive shaft 35 is arranged from the inside of the roll main body 31 on the drive shaft 35 to the inside of one of the two roll support parts 33. has been done. Inner bearings 52 are arranged between the fixed shaft 36 and the drive shaft 35 near both ends of the fixed shaft 36 in the length direction, and the fixed shaft 36 is rotated relative to the drive shaft 35 by the inner bearings 52. It is freely arranged inside the drive shaft 35. That is, the drive shaft 35 can rotate relative to the fixed shaft 36, so that the drive shaft 35 rotates around the outer circumference of the fixed shaft 36 with respect to the fixed shaft 36, which is arranged in a non-rotatable state. It can be rotated on the side.

Inside the forming roll 30 formed in this manner, there is a heat medium flow path 40 which is a flow path for a heat medium, and a heat pipe 41 for making the temperature of the outer circumferential surface 32 of the forming roll 30 uniform. It is formed. The heat medium flow path 40 is formed in the shape of a passage through which a heat medium flows, and the forming roll 30 is capable of exchanging heat with the heat medium flowing through the heat medium flow path 40 . In this embodiment, the forming roll 30 can be cooled by exchanging heat with the heat medium flowing through the heat medium flow path 40, and water is used as the heat medium. That is, the heat medium flowing through the heat medium flow path 40 serves as cooling water for cooling the forming roll 30. Further, the heat pipe 41 has a gas-liquid two-phase heating medium sealed therein, and serves as a portion that uniformizes the temperature of the outer circumferential surface 32 of the forming roll 30 by transferring latent heat of the heating medium. Both the heat medium flow path 40 and the heat pipe 41 are formed on the drive shaft 35.

The heat pipe 41 is formed in the roll main body portion 31 that the drive shaft 35 has. Specifically, the heat pipe 41 is formed in a hole-like shape that extends in a direction parallel to the cylindrical central axis of the roll body 31 at a position immediately adjacent to the outer circumferential surface 32 of the roll body 31. 31 from near one end to near the other end in the length direction. The heat pipe 41 forms a sealed space by closing both ends in the length direction, and the heat medium sealed in the heat pipe 41 is sealed in this sealed space. For example, water is used as the gas-liquid two-phase heat medium sealed in the heat pipe 41.

The heat medium flow path 40 is formed from the roll body portion 31 of the drive shaft 35 to the roll support portion 33 on the side of the drive shaft 35 on which the fixed shaft 36 is not disposed. Specifically, the portion of the heat medium flow path 40 that is formed in the roll main body 31 is arranged at a position on the inner side of the roll main body 31 in the radial direction than the heat pipe 41 . Further, the portion of the heat medium flow path 40 formed in the roll main body 31 is formed in a hole-like shape extending in a direction parallel to the central axis of the cylinder of the roll main body 31, similarly to the heat pipe 41. , are arranged from near one end to near the other end in the length direction of the roll main body 31 .

FIG. 3 is a cross-sectional view taken along line AA in FIG. Further, the heat medium flow path 40 is formed in a U-shape in a portion formed in the roll body portion 31. That is, in the portion of the heat medium flow path 40 formed in the roll body 31, one end of holes adjacent to each other in the circumferential direction of the roll body 31 are connected. , is formed in a U-shape. In other words, the heat medium flow path 40 extends in a direction parallel to the central axis of the cylinder of the roll body 31 in the portion formed in the roll body 31, and extends near one end in the length direction of the roll body 31. It is folded back. The folded portion of the heat medium flow path 40 is near the end in the length direction of the roll main body portion 31 on the side where the roll support portion 33 on which the fixed shaft 36 is disposed inside is located.

The heat medium flow path 40 has two holes in a portion located on the opposite side of the folded back side of the roll body 31, and a fixed shaft 36 is formed inside the roll body 31 independently. It is formed over the roll support part 33 on the side where it is not arranged. A rotary joint 55 is disposed at the end of the roll support section 33 on the side of the forming roll 30 on which the fixed shaft 36 is not disposed inside, and a rotary joint 55 is arranged at the end of the roll support section 33 on the side where the fixed shaft 36 is not disposed inside. The two holes each independently communicate with the rotary joint 55. A return path 71 and an inflow path 72 of a heat medium path 70 that supplies a heat medium to the heat medium path 40 are connected to the rotary joint 55, and the two holes in the heat medium path 40 are connected to each other. It is connected to a return path 71 and an inflow path 72 via a rotary joint 55 .

FIG. 4 is a sectional view taken along line BB in FIG. A plurality of heat pipes 41 and heat medium flow paths 40 formed on the drive shaft 35 of the forming roll 30 are arranged at equal intervals in the circumferential direction around the central axis of the cylinder on the drive shaft 35. .

Further, a roll heater 45 that can raise the temperature of the outer circumferential surface 32 of the forming roll 30 is arranged on the fixed shaft 36 of the forming roll 30. The roll heater 45 is arranged at a portion of the fixed shaft 36 located inside the roll main body 31 that the drive shaft 35 has. The roll heater 45 is disposed at a position facing the inner circumferential surface of the roll main body 31 and is formed in a coil shape, and heats the outer circumferential surface 32 of the forming roll 30 by generating an induced current in the roll main body 31. It is possible to raise it. That is, the roll heater 45 formed in a coil shape generates an alternating magnetic flux when an alternating voltage is applied, and when the alternating magnetic flux passes through the roll body 31, an induced current is generated in the roll body 31. Joule heat is generated in the roll main body 31 by this induced current, and the temperature in a predetermined range including the outer peripheral surface 32 increases. That is, the drive shaft 35 including the roll body 31 is made of a metal material, and the roll heater 45 raises the temperature of the outer circumferential surface 32 by generating Joule heat on the roll body 31 made of the metal material. It is now possible.

The roll heater 45 is connected to a roll heater conducting wire 61 disposed outside the forming roll 30 via a lead wire L1, and the roll heater 45 is connected to a roll heater conducting wire 61 disposed outside the forming roll 30 via a lead wire L1. , is connected to an AC power source (not shown) disposed outside the forming roll 30. This makes it possible to apply an AC voltage to the roll heater 45 using an AC power source.

Furthermore, the forming roll 30 is equipped with a roll temperature sensor 46 that detects the temperature of the outer peripheral surface 32. The roll temperature sensor 46 is disposed on the roll body 31 of the drive shaft 35, and is located at a position immediately adjacent to the outer circumferential surface 32 of the roll body 31 in the circumferential direction centered on the central axis of the cylinder of the drive shaft 35. , are arranged between the heat pipes 41. The roll temperature sensor 46 is thus arranged at a position immediately adjacent to the outer circumferential surface 32 of the roll main body 31, thereby making it possible to detect the temperature of the outer circumferential surface 32. The roll temperature sensor 46 is electrically connected to a roll temperature sensor conducting wire 62 arranged outside the forming roll 30 via the lead wire L2 and the rotary transformer 60.

Specifically, the rotary transformer 60 is disposed at the end of the forming roll 30 opposite to the end on which the rotary joint 55 is disposed, and the roll temperature sensor conductor 62 is connected from the outside of the forming roll 30 to the rotary joint 55. It is connected to the transformer 60. Further, the lead wire L2 connected to the roll temperature sensor 46 is connected to a rotary transformer 60, and the rotary transformer 60 connects the lead wire L2, which rotates together with the drive shaft 35 when the drive shaft 35 rotates, and the roll temperature sensor 46. Electrical signals can be sent to and from sensor leads 62. Thereby, the lead wire L2 and the roll temperature sensor conducting wire 62 are electrically connected via the rotary transformer 60, that is, electrically connected to the roll temperature sensor 46.

The roll heater 45 disposed on the fixed shaft 36 of the forming roll 30 can adjust the temperature of the outer circumferential surface 32 of the forming roll 30 based on the temperature of the outer circumferential surface 32 of the forming roll 30 detected by the roll temperature sensor 46. It is now possible. That is, the AC power supply that applies AC voltage to the roll heater 45 controls the voltage applied to the roll heater 45 and the ON/OFF control based on the temperature of the outer peripheral surface 32 of the forming roll 30 detected by the roll temperature sensor 46. By doing so, the temperature of the outer circumferential surface 32 of the forming roll 30 is adjusted.

<Temperature control device 100>
FIG. 5 is a schematic diagram showing the configuration of the temperature control device 100 for the forming roll 30 according to the embodiment. The temperature control device 100 for the forming roll 30 includes a temperature control unit 105 including a return temperature sensor 81, an inflow temperature sensor 82, a flow meter 83, a temperature adjustment device 84, a pump 90, and a flow rate adjustment section 95. A heat medium path 70 through which a heat medium flows is provided.

Among these, the heat medium path 70 is a heat medium path connected to the heat medium flow path 40 (see FIG. 2) formed in the forming roll 30, and is a path for the heat medium flowing out from the heat medium flow path 40. It has a return path 71 through which a certain cooling water flows, and an inflow path 72 through which cooling water flowing into the heat medium flow path 40 flows. The return path 71 and the inflow path 72 of the heating medium path 70 are connected to the rotary joint 55 (see FIG. 2) arranged at the end of the forming roll 30, so that the heating medium path 70 is connected to the forming roll via the rotary joint 55. 30 heat medium flow paths 40. As a result, the cooling water flowing out from the heat medium flow path 40 can flow into the return path 71 of the heat medium path 70, and the inflow path 72 of the heat medium path 70 and the heat medium flow path 40 can be connected to each other. In between, cooling water can flow into the heat medium flow path 40 from the inflow path 72. Therefore, the heat medium path 70 having the return path 71 and the inflow path 72 and the heat medium flow path 40 of the forming roll 30 constitute a circulation path through which the cooling water circulates.

The temperature control device 84 included in the temperature control unit 105 is capable of adjusting the temperature of the cooling water flowing through the inflow path 72 by exchanging heat with the cooling water flowing through the heat medium path 70. . Specifically, the temperature adjustment device 84 includes a heat exchanger 85, a refrigerant flow path 86, a flow rate adjustment valve 87, and a motor valve 88. Among these, the heat exchanger 85 is arranged on the heat medium path 70 with a part of the refrigerant flow path 86 adjacent to the heat medium path 70 . The refrigerant flow path 86 is a flow path through which a refrigerant exchanges heat with the cooling water flowing through the heat medium path 70 . The heat exchanger 85 can cool the cooling water flowing through the heat medium path 70 by exchanging heat between the cooling water flowing through the heat medium path 70 and the refrigerant flowing through the coolant flow path 86. ing. The flow rate adjustment valve 87 is disposed in a portion of the refrigerant flow path 86 on the side where the refrigerant flows into the heat exchanger 85, and is a valve that adjusts the flow rate of the refrigerant flowing through the refrigerant flow path 86. The motor valve 88 serves as a driving means for operating the flow rate adjustment valve 87 to adjust the opening degree of the flow rate adjustment valve 87. The temperature adjustment device 84 can adjust the flow rate of the refrigerant flowing through the refrigerant flow path 86 by driving the motor valve 88 and operating the flow rate adjustment valve 87, and heat exchanges the cooling water flowing through the heat medium path 70. The degree of cooling when cooling with the container 85 can be adjusted. Thereby, the temperature adjustment device 84 can adjust the temperature of the cooling water flowing through the heat medium path 70 and can adjust the temperature of the cooling water flowing through the inflow path 72.

The pump 90 is disposed in the heat medium path 70 and is capable of causing the cooling water flowing through the heat medium path 70 to flow from the return path 71 side to the inflow path 72 side. Thereby, the cooling water flowing out from the heat medium flow path 40 of the forming roll 30 passes through the return path 71 and the inflow path 72 and flows into the heat medium flow path 40 again. In this embodiment, the pump 90 is arranged downstream of the heat exchanger 85 in the flow direction of the cooling water flowing through the heat medium path 70 .

The flow rate adjustment unit 95 is capable of adjusting the flow rate of cooling water flowing into the heat medium flow path 40 from the inflow path 72. In the present embodiment, the heat medium path 70 has a bypass path 75 that allows cooling water to flow from the inflow path 72 side to the return path 71, and the flow rate adjustment unit 95 controls the flow rate of the cooling water to flow in the bypass path 75 in three directions. By adjusting the valve 96, the flow rate of the cooling water flowing into the heat medium flow path 40 from the inflow path 72 is adjusted. Specifically, the bypass path 75 connects the downstream position of the pump 90 and the upstream position of the heat exchanger 85 in the flow direction of the cooling water flowing through the heat medium path 70, and bypasses between the two. It has a path through which cooling water can flow. Further, the flow rate adjustment unit 95 includes a three-way valve 96 and a motor valve 97, and the three-way valve 96 is located downstream of the pump 90 in the heat medium path 70, and is connected to the inflow path 72 side and the bypass path 75. It is located at the part where it branches.

The three-way valve 96 is disposed at the part that branches to the bypass path 75 in this way, so that the cooling water flowing from the pump 90 side is routed only to the inflow path 72 side, only to the bypass path 75 side, or to the inflow path 72 side. It is possible to switch between branching and flowing the water to the bypass path 75 side and the bypass path 75 side as appropriate. Therefore, the three-way valve 96 can adjust the proportion of cooling water flowing into the inflow path 72 and the proportion of cooling water flowing into the bypass path 75 among the cooling water flowing from the return path 71 side. ing. The motor valve 97 operates the three-way valve 96 configured as described above, and can switch the direction in which the cooling water flowing from the return path 71 side flows and adjust the flow rate. Thereby, the flow rate adjustment section 95 can adjust the flow rate of the cooling water flowing into the heat medium flow path 40 from the inflow path 72.

The return temperature sensor 81 is disposed upstream of the heat exchanger 85 in the flow direction of the cooling water flowing through the heat medium path 70, and is capable of detecting the temperature of the cooling water flowing through the return path 71. . Further, the inflow temperature sensor 82 is disposed downstream of the three-way valve 96 in the flow direction of the cooling water flowing through the heat medium path 70, and is capable of detecting the temperature of the cooling water flowing through the inflow path 72. There is.

Among the temperatures detected by the return temperature sensor 81 and the inflow temperature sensor 82, the temperature of the cooling water detected by the return temperature sensor 81 is used to adjust the flow rate of the cooling water in the flow rate adjustment section 95. That is, the flow rate adjustment unit 95 adjusts the flow rate of the cooling water flowing into the heat medium flow path 40 from the inflow path 72 based on the temperature of the cooling water detected by the return temperature sensor 81. Further, the temperature of the cooling water detected by the return temperature sensor 81 is used to adjust the temperature of the cooling water in the temperature adjustment device 84. That is, the temperature adjustment device 84 adjusts the temperature of the cooling water flowing through the inflow path 72 based on the temperature of the cooling water detected by the inflow temperature sensor 82.

Further, the flow meter 83 can detect the flow rate of the cooling water flowing through the heat medium path 70 and is disposed downstream of the inflow temperature sensor 82 in the flow direction of the cooling water flowing through the heat medium path 70 . Since the flow meter 83 is disposed downstream of the three-way valve 96 of the flow rate adjustment section 95, the flow rate of the cooling water flowing into the heat medium flow path 40 of the forming roll 30 through the inflow path 72 of the heat medium path 70 can be adjusted. It is now possible to detect.

The temperature control unit 105 is equipped with a control device (not shown) that performs various processes, and can obtain the detection results of the roll temperature sensor 46, return temperature sensor 81, inflow temperature sensor 82, and flow meter 83. Based on these detection results, it is possible to control the roll heater 45, temperature adjustment device 84, pump 90, and flow rate adjustment section 95.

<Operation of temperature control device 100 for forming roll 30>
The temperature control device 100 for the forming roll 30 according to this embodiment includes the above configuration, and its operation will be described below. In the molding apparatus 1 equipped with the molding roll 30 according to the embodiment as the second roll 22 of the molding roll unit 20, when molding the molded sheet S, the molten resin material is passed through the slit-shaped discharge of the T-die 12. It is discharged from the outlet and supplied to the portion between the first roll 21 and the second roll 22 of the forming roll unit 20.

Here, the forming roll 30, which is the second roll 22, can adjust the temperature of the outer circumferential surface 32 with which the resin material comes into contact. That is, while the forming roll 30 can increase the temperature of the outer peripheral surface 32 by the roll heater 45, the temperature of the outer peripheral surface 32 can be lowered by the cooling water flowing through the heat medium flow path 40.

In the temperature control device 100 for the forming roll 30 according to the present embodiment, when forming the forming sheet S, before the resin material is supplied to the forming roll 30, the temperature of the outer peripheral surface 32 is controlled by the roll heater 45. The temperature is adjusted in advance to a temperature suitable for molding, and cooling water is allowed to flow through the heat medium flow path 40 of the molding roll 30. That is, by operating the pump 90 and operating the flow rate adjustment unit 95 so that the cooling water flows to the inflow path 72 side of the heating medium path 70, the heating medium path 40 of the forming roll 30 and the heating medium path 70 are controlled. Cooling water is circulated between the

While cooling water is flowing through the heat medium flow path 40, the temperature of the outer circumferential surface 32 of the forming roll 30 is adjusted to a temperature suitable for forming the formed sheet S by the roll heater 45. At this time, since the roll main body 31 of the forming roll 30 is formed with a heat pipe 41 in which a gas-liquid two-phase heating medium is sealed, the heat pipe 41 is formed over the entire range in the length direction of the roll main body 31. The temperature of the outer circumferential surface 32 of the forming roll 30 is made uniform by efficient heat transfer by the heat pipe 41. Further, when molding the molded sheet S, the resin material is supplied from the T-die 12 while the drive shaft 35 of the molding roll 30 is further rotated by the rotational drive mechanism. Thereby, the resin material is conveyed to the third roll 23 side located downstream in the forming roll unit 20 while being solidified, and is formed into a formed sheet S.

At that time, the resin material is supplied to the outer circumferential surface 32 of the forming roll 30 in a molten and high-temperature state, so the temperature of the outer circumferential surface 32 increases as the high temperature resin material comes into contact with the outer circumferential surface 32. do. For this reason, the temperature control device 100 for the forming roll 30 adjusts the electric power of the roll heater 45, and adjusts the flow rate and temperature of the cooling water circulating between the heat medium flow path 40 and the heat medium path 70 of the forming roll 30. By adjusting the temperature, the temperature of the outer circumferential surface 32 of the forming roll 30 is kept within a temperature range suitable for forming the forming sheet S. These adjustments are made based on the temperature of the outer peripheral surface 32 of the forming roll 30 detected by the roll temperature sensor 46 and the temperature of the cooling water detected by the return temperature sensor 81 and the inflow temperature sensor 82.

For example, if the temperature of the outer circumferential surface 32 of the forming roll 30 detected by the roll temperature sensor 46 is higher than a predetermined set temperature, the temperature of the outer circumferential surface 32 due to the induced current is increased by lowering the electric power of the roll heater 45. or do not increase the temperature. Further, if the temperature of the outer circumferential surface 32 of the forming roll 30 detected by the roll temperature sensor 46 is lower than a predetermined set temperature, the temperature of the outer circumferential surface 32 is lowered by an induced current by increasing the electric power of the roll heater 45. raise.

Further, the temperature of the cooling water is adjusted to the temperature of the cooling water detected by the inflow temperature sensor 82 by a temperature adjustment device 84 that exchanges heat between the cooling water flowing through the heat medium path 70 and the refrigerant flowing through the refrigerant flow path 86. Adjust accordingly. Specifically, if the temperature of the cooling water detected by the inflow temperature sensor 82 is higher than a predetermined set temperature, the temperature adjustment device 84 increases the flow rate of the refrigerant flowing through the refrigerant flow path 86 to adjust the temperature of the heat medium path 70. The degree of cooling when cooling water flowing through the heat exchanger 85 is increased. On the other hand, if the temperature of the cooling water detected by the inflow temperature sensor 82 is lower than the set temperature, the flow rate of the refrigerant flowing through the refrigerant flow path 86 is reduced, so that the cooling water flowing through the heat medium path 70 is transferred to the heat exchanger 85. Reduces the degree of cooling during cooling.

That is, the heat medium path 70 circulates cooling water between the heat medium flow path 40 of the forming roll 30, but the cooling water flowing through the heat medium flow path 40 exchanges heat with the forming roll 30. . Therefore, when the temperature of the forming roll 30 is high, the temperature of the cooling water also becomes high, and when the temperature of the forming roll 30 is low, the temperature of the cooling water also becomes low.

Therefore, when the predetermined set temperature of the cooling water detected by the inflow temperature sensor 82 is high, it can be determined that the temperature of the outer peripheral surface 32 of the forming roll 30 is also high. The flow rate of the refrigerant is increased by the flow rate adjustment valve 87 to increase the degree of cooling when cooling water flowing through the heat medium path 70 is cooled by the heat exchanger 85. This allows the temperature of the outer circumferential surface 32 of the forming roll 30 to be further reduced by the cooling water. Further, if the predetermined set temperature of the cooling water detected by the inflow temperature sensor 82 is low, it can be determined that the temperature of the outer peripheral surface 32 of the forming roll 30 is also low. The flow rate of the refrigerant is reduced by the flow rate adjustment valve 87 to reduce the degree of cooling when cooling water flowing through the heat medium path 70 is cooled by the heat exchanger 85. This reduces the degree to which the temperature of the outer circumferential surface 32 of the forming roll 30 is lowered by the cooling water.

The flow rate of the cooling water is determined by the flow rate adjustment unit 95 based on the temperature of the cooling water detected by the return temperature sensor 81. Adjust by. Specifically, if the temperature of the cooling water detected by the return temperature sensor 81 is higher than a predetermined set temperature, the flow rate adjustment unit 95 adjusts the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40. If the temperature of the cooling water detected by the return temperature sensor 81 is lower than the set temperature, the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40 is decreased.

In other words, the cooling water whose temperature is detected by the return temperature sensor 81 is the cooling water after the cooling water flowing through the heat medium flow path 40 of the forming roll 30 has exchanged heat with the forming roll 30. If the temperature of the cooling water detected by the temperature sensor 81 is high, this indicates that the forming roll 30 is not completely cooled with the current flow rate of the cooling water. Therefore, when the temperature of the cooling water detected by the return temperature sensor 81 is higher than the predetermined set temperature, the flow rate of the cooling water flowing into the heat medium flow path 40 of the forming roll 30 is increased, and more cooling water is used to make the forming roll. 30 to be able to cool down.

Furthermore, when the temperature of the cooling water detected by the return temperature sensor 81 is high, this indicates that the temperature of the cooling water is likely to become high even within the heat medium flow path 40 of the forming roll 30. If the temperature of the cooling water becomes too high, the cooling water boils and turns into water vapor, which rapidly expands in volume, causing impact noise, making it impossible to operate the pump 90 stably, etc. There is a possibility that harm may occur. Therefore, when the temperature of the cooling water detected by the return temperature sensor 81 is higher than a predetermined set temperature, the flow rate of the cooling water flowing into the heat medium flow path 40 of the forming roll 30 is increased to increase the temperature of the cooling water. This prevents the cooling water from boiling and turning into steam. In this embodiment, the operation of adjusting the flow rate of the cooling water flowing into the heat medium flow path 40 of the forming roll 30 based on the temperature of the cooling water detected by the return temperature sensor 81 is given priority over other adjustment operations. I will do it.

On the contrary, if the temperature of the cooling water detected by the return temperature sensor 81 is low, this indicates that the forming roll 30 is being cooled too much with the current flow rate of the cooling water. Therefore, when the temperature of the cooling water detected by the return temperature sensor 81 is lower than a predetermined set temperature, the flow rate of the cooling water flowing through the heat medium flow path 40 of the forming roll 30 is reduced, and the cooling water that cools the forming roll 30 is reduced. By reducing the water, the forming roll 30 is prevented from cooling too much.

The flow rate of the cooling water in the flow rate adjustment section 95 is adjusted by operating a three-way valve 96 using a motor valve 97. Specifically, when the temperature of the cooling water detected by the return temperature sensor 81 is higher than a predetermined set temperature, the motor valve 97 operates the three-way valve 96 to reduce the proportion of the cooling water flowing into the bypass path 75. to increase the proportion of cooling water flowing into the inflow path 72. On the other hand, if the temperature of the cooling water detected by the return temperature sensor 81 is lower than the predetermined set temperature, the flow rate adjustment unit 95 causes the motor valve 97 to operate the three-way valve 96 to cause the cooling water to flow into the bypass path 75. The ratio of cooling water flowing into the inflow path 72 is decreased.

Further, the temperature and flow rate of the cooling water are adjusted not only by the temperature of the cooling water detected by the inflow temperature sensor 82 and the return temperature sensor 81, but also by the amount of electric power of the roll heater 45 that increases the temperature of the outer peripheral surface 32 of the forming roll 30. It is also done using In other words, the temperature control unit 105 is capable of detecting the amount of power supplied to the roll heater 45 and controlling the flow rate adjustment section 95 and the temperature adjustment device 84 based on the detected amount of power. .

For example, when the amount of electric power of the roll heater 45 is large, this indicates that the temperature of the outer circumferential surface 32 of the forming roll 30 is low and it is necessary to increase the temperature of the outer circumferential surface 32 of the forming roll 30. Therefore, in this case, in order to increase the temperature of the outer peripheral surface 32 of the forming roll 30, the flow rate adjustment section 95 adjusts the flow rate of the cooling water, and the temperature adjustment device 84 adjusts the temperature of the cooling water. I do things. On the other hand, when the amount of electric power of the roll heater 45 is small, this indicates that the temperature of the outer circumferential surface 32 of the forming roll 30 is high and it is necessary to lower the temperature of the outer circumferential surface 32 of the forming roll 30. Therefore, in this case, in order to reduce the temperature of the outer circumferential surface 32 of the forming roll 30, the flow rate adjustment section 95 adjusts the flow rate of the cooling water, and the temperature adjustment device 84 adjusts the temperature of the cooling water. I do things.

Specifically, when the amount of power of the roll heater 45 is greater than a predetermined set amount of power, the flow rate adjustment unit 95 reduces the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40, and When the amount of power of the heater 45 is less than the set amount of power, the flow rate of the cooling water flowing through the inlet path 72 toward the heat medium flow path 40 is increased. That is, the flow rate adjustment unit 95 operates the three-way valve 96 using the motor valve 97 based on the amount of electric power of the roll heater 45 to increase the proportion of the cooling water flowing into the bypass path 75 to reduce the amount of cooling water flowing into the inflow path 72. The ratio may be decreased, or the ratio of cooling water flowing into the bypass path 75 may be reduced and the ratio of cooling water flowing into the inflow path 72 may be increased.

Further, when the amount of power of the roll heater 45 is higher than a predetermined set amount of power, the temperature adjustment device 84 reduces the degree of cooling when cooling water is cooled by the heat exchanger 85, and reduces the amount of power of the roll heater 45. If the amount of power is less than the set amount of power, the degree of cooling when cooling the cooling water with the heat exchanger 85 is increased. The temperature and flow rate of the cooling water are adjusted not only with reference to the temperature of the cooling water flowing through the heat medium path 70 but also with reference to the amount of electric power of the roll heater 45 as described above.

As described above, the amount of power of the roll heater 45 is adjusted based on the temperature of the outer peripheral surface 32 of the forming roll 30, and the amount of power of the cooling water is adjusted based on the temperature of the cooling water detected by the return temperature sensor 81 and the inflow temperature sensor 82. When adjusting the flow rate or temperature, the detected values over a certain period of time are averaged and used. For example, the temperature of the outer peripheral surface 32 of the forming roll 30 detected by the roll temperature sensor 46 is determined by averaging the detection results detected for a certain period of time by the roll temperature sensor 46. It is used as the temperature of the outer peripheral surface 32.

Similarly, the temperature of the cooling water detected by the return temperature sensor 81 is calculated by averaging the detection results of the temperature of the cooling water detected by the return temperature sensor 81 for a certain period of time. Use as temperature. At this time, the time for averaging the temperature of the cooling water detected by the return temperature sensor 81 is set to be longer than the time for averaging the temperature of the outer peripheral surface 32 of the forming roll 30 detected by the roll temperature sensor 46. . In other words, the temperature of the cooling water detected by the return temperature sensor 81 is determined by averaging the detection results of the temperature of the cooling water detected by the return temperature sensor 81 for a longer time than the time in which the detection results by the roll temperature sensor 46 are averaged. This value is used as the temperature of the cooling water detected by the return temperature sensor 81.

For example, the time for averaging the temperature of the outer peripheral surface 32 of the forming roll 30 detected by the roll temperature sensor 46 is 10 seconds or less, and the time for averaging the temperature of the cooling water detected by the return temperature sensor 81 is 1 minute to 10 minutes. It is preferable to set it as approximately. In other words, the time taken to average the temperature of the cooling water detected by the return temperature sensor 81 is several times longer than the time taken to average the temperature of the outer peripheral surface 32 of the forming roll 30 detected by the roll temperature sensor 46. is desirable. Adjustment of the temperature of the outer circumferential surface 32 of the forming roll 30 by the roll heater 45 and adjustment of the flow rate and temperature of cooling water by the flow rate adjustment section 95 and the temperature adjustment device 84 are performed by averaging each detected value as described above. This is done using the

<Effects of embodiment>
The temperature control device 100 for the forming roll 30 according to the above embodiment includes a return temperature sensor 81 that detects the temperature of the cooling water flowing through the return path 71 of the heating medium path 70 and a heating medium flow path 40 of the forming roll 30. Since it is equipped with a flow rate adjustment section 95 that adjusts the flow rate of the cooling water flowing in, the flow rate of the cooling water flowing into the heat medium flow path 40 of the forming roll 30 is adjusted based on the temperature of the cooling water flowing through the return path 71. be able to. Thereby, the temperature of the cooling water flowing through the heat medium flow path 40 of the forming roll 30 can be prevented from becoming too high, and the cooling water can be prevented from boiling and turning into steam. As a result, temperature control can be performed with higher precision.

In addition, since the heating medium path 70 includes an inflow temperature sensor 82 that detects the temperature of the cooling water flowing through the inflow path 72 and a temperature adjustment device 84 that adjusts the temperature of the cooling water flowing through the inflow path 72, the inflow path 72 The temperature of the cooling water flowing through the inflow path 72 can be adjusted based on the temperature of the cooling water flowing through the inflow path 72 . Thereby, the temperature of the cooling water flowing through the heat medium flow path 40 of the forming roll 30 for cooling the forming roll 30 can be suppressed from becoming too high or too low, and The temperature can be set to a temperature suitable for molding the molded sheet S more reliably. As a result, temperature control can be performed with higher precision.

In addition, the temperature adjustment device 84 increases the degree of cooling of the cooling water when the temperature of the cooling water detected by the inflow temperature sensor 82 is higher than a predetermined set temperature. You can prevent it from becoming too much. As a result, when molding the molded sheet S, the temperature of the outer peripheral surface 32 can be controlled even in a situation where the temperature of the outer peripheral surface 32 tends to increase due to, for example, a high temperature resin material coming into contact with the outer peripheral surface 32 of the forming roll 30. It can be reduced in a short time and the resin material can be appropriately cooled and solidified. In addition, the temperature adjustment device 84 reduces the degree of cooling of the cooling water when the temperature of the cooling water detected by the inflow temperature sensor 82 is lower than a predetermined set temperature, so that the temperature of the outer peripheral surface 32 of the forming roll 30 is low. You can prevent it from becoming too much. As a result, when molding the molded sheet S, for example, even if the temperature of the resin material in contact with the outer peripheral surface 32 of the molding roll 30 is relatively low, the resin material may solidify too quickly. It is possible to easily increase the temperature of the surface 32, and it is possible to prevent the resin material from cooling and solidifying too quickly. As a result, temperature control can be performed with higher precision, and the molded sheet S can be molded more appropriately.

Further, the forming roll 30 has a roll heater 45 and a roll temperature sensor 46, and the roll heater 45 controls the outer circumference of the forming roll 30 based on the temperature of the outer circumferential surface 32 of the forming roll 30 detected by the roll temperature sensor 46. In order to adjust the temperature of the surface 32, the temperature of the outer circumferential surface 32 can be adjusted more directly. Thereby, the temperature of the outer circumferential surface 32 of the forming roll 30 can be adjusted to a temperature suitable for forming the forming sheet S with higher accuracy. As a result, temperature control can be performed with higher precision.

Further, when the amount of electric power of the roll heater 45 is larger than a predetermined set amount of electric power, the flow rate adjusting section 95 reduces the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40. In a situation where the amount of electric power of the roll heater 45 increases due to the low temperature of the outer circumferential surface 32 of the roll heater 45, the amount of cooling by the cooling water can be reduced. Thereby, the amount of electric power required to raise the temperature of the outer circumferential surface 32 of the forming roll 30 using the roll heater 45 can be suppressed as much as possible. Further, when the amount of power of the roll heater 45 is less than a predetermined setting amount of power, the flow rate adjustment unit 95 increases the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40, so that the amount of power flowing through the forming roll 30 is increased. In a situation where the amount of electric power of the roll heater 45 is suppressed because the temperature of the outer circumferential surface 32 of the roll heater 45 is high, the amount of cooling by the cooling water can be increased. Thereby, the temperature of the outer circumferential surface 32 of the forming roll 30, which has become high, can be quickly lowered by the cooling water. As a result, the temperature of the outer circumferential surface 32 of the forming roll 30 can be more reliably brought to an appropriate temperature while suppressing the power consumption of the roll heater 45.

In addition, when the amount of electric power of the roll heater 45 is higher than a predetermined set amount of electric power, the temperature adjusting device 84 lowers the degree of cooling of the cooling water. In a situation where the amount of electric power of the heater 45 increases, the amount of cooling by the cooling water can be reduced. Thereby, the amount of electric power required to raise the temperature of the outer circumferential surface 32 of the forming roll 30 using the roll heater 45 can be suppressed as much as possible. In addition, when the amount of power of the roll heater 45 is less than a predetermined set amount of power, the temperature control device 84 increases the degree of cooling of the cooling water. In a situation where the power amount of 45 is suppressed, the amount of cooling by cooling water can be increased. Thereby, the temperature of the outer circumferential surface 32 of the forming roll 30, which has become high, can be quickly lowered by the cooling water. As a result, the temperature of the outer circumferential surface 32 of the forming roll 30 can be more reliably brought to an appropriate temperature while suppressing the power consumption of the roll heater 45.

Furthermore, the temperature of the outer peripheral surface 32 of the forming roll 30 detected by the roll temperature sensor 46 and the temperature of the cooling water detected by the return temperature sensor 81 are controlled by averaging the detection results detected for a certain period of time. Since the detected value is used as the detected value, hunting caused by frequent changes in the detected value in a short period of time can be suppressed. Further, by setting the time for averaging the detection results of the return temperature sensor 81 to be longer than the time for averaging the detection results of the roll temperature sensor 46, it is possible to suppress control from becoming complicated. can. In other words, the adjustment of the flow rate of cooling water using the detection result from the return temperature sensor 81 is the adjustment of the temperature of the outer circumferential surface 32 of the forming roll 30 by the roll heater 45 using the detection result from the roll temperature sensor 46. Compared to this, the responsiveness of the temperature change of the outer circumferential surface 32 when adjustment is performed is lower. Therefore, by setting the time for averaging the detection results of the return temperature sensor 81 to be longer than the time for averaging the detection results of the roll temperature sensor 46, the temperature of the outer peripheral surface 32 of the forming roll 30 can be adjusted. The frequency of control can be reduced while ensuring effectiveness in adjustment. As a result, it is possible to perform temperature control with higher precision while simplifying the control.

Further, the heat medium path 70 has a bypass path 75, and the flow rate adjustment unit 95 adjusts the ratio of the cooling water flowing into the inflow path 72 and the ratio of cooling water flowing into the bypass path 75. Since the flow rate of the cooling water flowing into the heat medium flow path 40 of the forming roll 30 is adjusted, the flow rate of the cooling water flowing into the heat medium flow path 40 can be easily adjusted. In addition, since the cooling water that does not flow to the heat medium flow path 40 side of the forming roll 30 flows to the return path 71 side, the temperature of the cooling water is increased by exchanging heat with the forming roll 30 in the heat medium flow path 40. Even when the temperature becomes high, the temperature of the cooling water in the return path 71 can be lowered by merging the high-temperature cooling water in the return path 71 with the cooling water from the bypass path 75. As a result, the cooling water that has exchanged heat with the forming roll 30 flows, so that the temperature of the cooling water in the return path 71, where high-temperature cooling water easily flows, can be lowered. By increasing the temperature too much, it is possible to prevent the cooling water from boiling and turning into steam. As a result, temperature control can be performed more easily and with high precision.

Further, when the temperature of the cooling water detected by the return temperature sensor 81 is higher than a predetermined set temperature, the flow rate adjustment unit 95 increases the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40. , it is possible to prevent the temperature of the outer circumferential surface 32 of the forming roll 30 from becoming too high. As a result, when molding the molded sheet S, the temperature of the outer peripheral surface 32 can be controlled even in a situation where the temperature of the outer peripheral surface 32 tends to increase due to, for example, a high temperature resin material coming into contact with the outer peripheral surface 32 of the forming roll 30. It can be reduced in a short time and the resin material can be appropriately cooled and solidified. Further, when the temperature of the cooling water detected by the return temperature sensor 81 is lower than a predetermined set temperature, the flow rate adjustment unit 95 reduces the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40. , it is possible to prevent the temperature of the outer circumferential surface 32 of the forming roll 30 from becoming too low. As a result, when molding the molded sheet S, for example, even if the temperature of the resin material in contact with the outer peripheral surface 32 of the molding roll 30 is relatively low, the resin material may solidify too quickly. It is possible to easily increase the temperature of the surface 32, and it is possible to prevent the resin material from cooling and solidifying too quickly. As a result, temperature control can be performed with higher precision, and the molded sheet S can be molded more appropriately.

[Modified example]
In addition, in the embodiment described above, the temperature adjustment device 84 only lowers the temperature of the cooling water, but the temperature adjustment device 84 may use a heater that heats the cooling water. That is, the temperature adjustment device 84 not only cools the cooling water flowing through the heat medium path 70 but also increases the temperature of the outer circumferential surface 32 of the forming roll 30 by heating the cooling water flowing through the heat medium path 70 with a heater. It may be used to assist in the process of forming the molded sheet S, or to control the temperature of the cooling water during molding of the molded sheet S.

Further, in the embodiment described above, the flow rate adjustment unit 95 includes a three-way valve 96 and a motor valve 97, and adjusts the proportion of the cooling water flowing into the bypass path 75 to adjust the flow rate of the cooling water flowing into the inflow path 72. However, the flow rate adjustment section 95 may have a configuration other than this. The flow rate adjustment unit 95 may be configured, for example, by using a pump 90 that sends the cooling water from the return path 71 to the inflow path 72 that can adjust the flow rate of the cooling water. As the pump 90 that adjusts the flow rate of the cooling water, for example, a pump that can adjust the flow rate by controlling the rotation speed of the pump 90 with an inverter may be used, or a variable capacity pump may be used to adjust the flow rate. It may be possible to do so. It is desirable that the flow rate adjustment section 95 is capable of continuously adjusting the flow rate of the cooling water flowing into the inflow path 72, regardless of the configuration of the flow rate adjustment section 95.

Further, in the embodiment described above, the cooling water is configured to circulate through the heat medium flow path 40 and the heat medium path 70 of the forming roll 30, but the cooling water does not need to be circulated. For example, the return path 71 and the inflow path 72 of the heating medium path 70 are not connected and are separated, and the cooling water flowing out from the heating medium path 40 of the forming roll 30 to the return path 71 is drained from the return path 71. Good too. In this case, the cooling water flowing into the heat medium flow path 40 of the forming roll 30 from the inflow path 72 is, for example, tap water flowing into the heat medium flow path 40 from the inflow path 72 and detected by the return temperature sensor 81. The flow rate adjustment unit 95 that adjusts the flow rate of cooling water based on the temperature of the cooling water may also adjust the flow rate of tap water.

FIG. 6 is a modification of the temperature control device 100 for the forming roll 30 according to the embodiment, and is an explanatory diagram showing a state in which a heat insulating material 40a is arranged in the heat medium flow path 40. Further, in the embodiment described above, the heat medium flow path 40 of the forming roll 30 is a hole-shaped path formed in the drive shaft 35 made of a metal material. A heat insulating material 40a may be inserted to prevent direct contact between the cooling water flowing through the heat medium flow path 40 and the metal portion forming the drive shaft 35. In other words, if the cooling water boils and turns into steam, the pump 90 cannot be operated stably, so heat is exchanged between the forming roll 30 whose temperature has become high and the cooling water flowing through the heat medium flow path 40. Even when this is done, it is necessary to ensure that the temperature of the cooling water does not exceed the boiling point. One method for suppressing the temperature rise of the cooling water flowing through the heat medium flow path 40 is to increase the flow rate of the cooling water. However, if the flow rate of the cooling water is increased to increase the flow velocity, the heat capacity of the cooling water will increase. If it becomes too large, there is a risk that the temperature of the outer circumferential surface 32 of the forming roll 30 will become too low. In order to suppress the heat capacity of the cooling water, if the diameter of the hole in the heat medium flow path 40 is made smaller, the flow rate of the cooling water flowing through the heat medium flow path 40 will decrease, and the heat capacity of the cooling water will become smaller, so the cooling water will be transferred to the forming roll. There is a possibility that the temperature tends to rise due to heat exchange with 30, and the temperature tends to approach the boiling point.

On the other hand, if a heat insulating material 40a is placed inside the heat medium flow path 40 to prevent direct contact between the cooling water flowing through the heat medium flow path 40 and the metal part forming the drive shaft 35, the molding The heat of the roll 30 becomes difficult to be transmitted to the cooling water, and the temperature of the cooling water becomes difficult to rise. As the heat insulating material 40a, it is preferable to use a member having lower thermal conductivity and higher heat resistance than metal. In this way, by inserting the heat insulating material 40a inside the heat medium flow path 40 to make it difficult for the heat of the forming roll 30 to be transmitted to the cooling water, it is possible to avoid reducing the diameter of the hole in the heat medium flow path 40. , it is possible to prevent the temperature of the outer circumferential surface 32 of the forming roll 30 from becoming too low. As a result, it is possible to prevent the temperature of the outer circumferential surface 32 of the forming roll 30 from lowering too much, and to ensure the flow rate of the cooling water and the heat capacity of the cooling water, thereby ensuring the cooling performance of the cooling water itself. At the same time, it is possible to prevent the cooling water from boiling and turning into water vapor. As a result, temperature control can be performed more reliably and with high precision.

Further, in the embodiment described above, only the second roll 22 in the forming roll unit 20 is formed as the forming roll 30 whose temperature is adjusted by the temperature control device 100, but the first roll 21 and the third roll 23 are also formed. , it may be formed as a forming roll 30 whose temperature is controlled by the temperature control device 100.

Furthermore, in the embodiment described above, the first roll 21, the second roll 22, and the third roll 23 of the forming roll unit 20 are arranged with the rotating shafts 21r, 22r, and 23r extending in the horizontal direction. The first roll 21, the second roll 22, and the third roll 23 may be arranged in other directions. The first roll 21, second roll 22, and third roll 23 of the forming roll unit 20 are arranged such that the rotating shafts 21r, 22r, and 23r extend vertically, or the rotating shafts 21r, 22r, and 23r are arranged horizontally. They may be arranged in a direction extending diagonally with respect to the direction and the vertical direction. If the forming roll unit 20 is configured so that the resin material supplied from the T-die 12 can be formed into a forming sheet S having a desired thickness, the forming roll unit 20 includes a first roll 21, a second roll 22, and a third roll. The orientation of the roll 23 does not matter.

DESCRIPTION OF SYMBOLS 1... Molding device, 10... Extrusion unit, 11... Extruder, 12... T-die, 13... Connection pipe, 20... Forming roll unit, 21... First roll, 21r... Rotating shaft, 22... Second roll, 22r... Rotating shaft, 23... Third roll, 23r... Rotating shaft, 30... Forming roll, 31... Roll main body, 32... Outer peripheral surface, 33... Roll support part, 35... Drive shaft, 36... Fixed shaft, 40... Heat medium Channel, 40a...Insulating material, 41...Heat pipe, 45...Roll heater, 46...Roll temperature sensor, 51...Outer bearing, 52...Inner bearing 55...Rotary joint, 60...Rotating transformer, 61...Roll heater conducting wire, 62 ... Roll temperature sensor conductor, 70 ... Heat medium path, 71 ... Return path, 72 ... Inflow path, 75 ... Bypass path, 81 ... Return temperature sensor, 82 ... Inflow temperature sensor, 83 ... Flow meter, 84 ... Temperature adjustment device, 85... Heat exchanger, 86... Refrigerant channel, 90... Pump, 95... Flow rate adjustment section, 96... Three-way valve, 97... Motor valve, 100... Temperature control device, 105... Temperature control unit, S... Molded sheet

Claims (9)

A forming roll having a heat medium flow path formed therein, which is a flow path for a heat medium, and capable of exchanging heat with the heat medium flowing through the heat medium flow path;
a heat medium path connected to the heat medium flow path and having a return path through which the heat medium flowing out from the heat medium flow path and an inflow path through which the heat medium flowing into the heat medium flow path flows;
a return temperature sensor that detects the temperature of the heat medium flowing in the return path;
a flow rate adjustment unit that adjusts the flow rate of the heat medium flowing into the heat medium flow path from the inflow path based on the temperature of the heat medium detected by the return temperature sensor;
Equipped with
A temperature control device for a forming roll, characterized in that a heat insulating material is disposed inside the heat medium flow path . an inflow temperature sensor that detects the temperature of the heat medium flowing through the inflow path;
a temperature adjustment device that adjusts the temperature of the heat medium flowing through the inflow path based on the temperature of the heat medium detected by the inflow temperature sensor;
The temperature control device for a forming roll according to claim 1, comprising: The temperature adjustment device increases the degree of cooling of the heating medium when the temperature of the heating medium detected by the inflow temperature sensor is higher than a predetermined set temperature, and increases the temperature of the heating medium detected by the inflow temperature sensor. 3. The forming roll temperature control device according to claim 2, wherein the degree of cooling of the heating medium is reduced when the heating medium is lower than the set temperature. a roll heater arranged on the forming roll and capable of increasing the temperature of the outer peripheral surface of the forming roll;
a roll temperature sensor that detects the temperature of the outer peripheral surface of the forming roll;
Equipped with
The forming roll according to any one of claims 1 to 3, wherein the roll heater adjusts the temperature of the outer peripheral surface of the forming roll based on the temperature of the outer peripheral surface of the forming roll detected by the roll temperature sensor. Temperature control device. When the amount of electric power of the roll heater is larger than a predetermined set amount of electric power, the flow rate adjustment section reduces the flow rate of the heating medium flowing through the inflow path toward the heating medium flow path, and reduces the electric power of the roll heater. The forming roll temperature control device according to claim 4, wherein the flow rate of the heating medium flowing through the inflow path toward the heating medium flow path is increased when the amount of electric power is less than the set electric power amount. comprising a temperature adjustment device that adjusts the temperature of the heat medium flowing through the inflow path;
The temperature adjustment device reduces the degree of cooling of the heat medium when the amount of power of the roll heater is greater than a predetermined set amount of power, and reduces the degree of cooling of the heat medium when the amount of power of the roll heater is less than the set amount of power. The forming roll temperature control device according to claim 4 or 5, wherein the temperature control device for forming rolls is configured to increase the degree of cooling of the medium. The temperature of the outer peripheral surface of the forming roll detected by the roll temperature sensor is the temperature of the outer peripheral surface of the forming roll detected by the roll temperature sensor, which is the average of the detection results detected for a certain period of time by the roll temperature sensor. Use as
The temperature of the heating medium detected by the return temperature sensor is determined by averaging the detection results of the temperature of the heating medium detected by the return temperature sensor for a longer time than the time for averaging the detection results by the roll temperature sensor. The forming roll temperature control device according to claim 4, wherein the temperature of the heating medium detected by the return temperature sensor is used as the temperature of the heating medium. The heating medium path has a bypass path that allows the heating medium to flow from the inflow path side to the return path,
The flow rate adjustment section adjusts a proportion of the heat medium flowing into the inflow path and a proportion of the heat medium flowing into the bypass path among the heat medium flowing from the return path side. The forming roll temperature control device according to any one of claims 1 to 7, which adjusts the flow rate of the heating medium flowing into the heating medium flow path from the inflow path. When the temperature of the heating medium detected by the return temperature sensor is higher than a predetermined set temperature, the flow rate adjustment unit increases the flow rate of the heating medium flowing through the inflow path toward the heating medium flow path, If the temperature of the heating medium detected by the return temperature sensor is lower than the set temperature, the flow rate of the heating medium flowing through the inflow path toward the heating medium flow path is reduced. The temperature control device for a forming roll according to item 1.

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