JP2021084241A - Temperature control device for molding roll - Google Patents

Abstract

To provide a temperature control device for a molding roll capable of performing temperature control with higher accuracy.SOLUTION: The temperature control device for the molding roll comprises: the molding roll 30 in which a heat medium flow channel 40, that is a flow channel of heat medium, is formed inside and can exchange heat with the heat medium flowing through the heat medium flow channel 40; a heat medium path 70 that is connected to the heat medium flow channel 40 and has a return path 71 through which cooling water flowing out of the heat medium flow channel 40 flows and an inflow path 72 through which the heat medium flowing into the heat medium flow channel 40 flows; a return temperature sensor 81 that detects a temperature of the heat medium flowing through the return path 71; and a flow rate adjusting part 95 that adjusts a flow rate of the cooling water flowing from the inflow path 72 into the heat medium flow channel 40 based on the temperature of the cooling water detected by the return temperature sensor 81.SELECTED DRAWING: Figure 5

Description

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

Some molding rolls, such as a resin sheet or a film (hereinafter, simply referred to as a sheet), which are conveyed while molding a processed product, are configured so that the temperature of the molding roll can be adjusted. Such molding rolls are provided 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 molding roll is provided with a coil for heating the roller by electromagnetic induction and a U-shaped tube through which cooling water flows. By adjusting the heat generated by electromagnetic induction in the coil and the cooling by flowing cooling water, the temperature of the roller can be adjusted. Further, in the temperature control device for the heat treatment roller described in Patent Document 2, the roller used as the molding roll is heated or cooled by forming a heat medium passage through which the heat medium used as the heat medium passes. The temperature of the roller can be adjusted by allowing the oil to flow through the heat transfer channel.

JP-A-54-43349 Japanese Unexamined Patent Publication No. 2004-195888

Here, in order to adjust the temperature of the molding 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 to exchange heat with the roll. However, since oil has a smaller specific heat than water, it is necessary to increase the flow rate when using oil as a heat medium. For this reason, water, which can exchange heat with the roll even at a smaller flow rate than oil, should be used as the heat medium for adjusting the temperature of the roll by exchanging heat with the roll. Has become preferable. Since water has a higher specific heat than oil, it is easier to exchange heat with the roll, and because it has a lower viscosity than oil, water has a higher specific heat than oil when flowing through the flow path of the heat medium. It is easy to flow through the flow path. Therefore, when water is used as the heat medium, heat exchange can be efficiently performed between the water as the heat medium and the roll, and the molding roll can be molded at high speed (large extrusion mass) with high accuracy. The temperature of the can be adjusted.

However, since water has a lower boiling point than oil, when water is used as a heat medium for heat exchange with the roll, the boiling point temperature is exceeded when the heat is exchanged with the hot roll. It may be easier. For example, when water is flowed as a heat medium through the flow path of the heat medium formed on the roll in order to cool the molded roll which has become hot, the temperature of the water rises due to heat exchange with the roll, but water When the temperature of water exceeds the boiling point, water boils to steam. When water boils and becomes steam, the volume rapidly expands, causing adverse effects such as an impact sound being generated inside the device and the pump that flows cooling water cannot be operated stably. Therefore, there is room for improvement in order to efficiently exchange heat with the roll using water as a heat medium and to adjust the temperature of the molding roll with high accuracy.

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 a molding roll capable of performing temperature control with higher accuracy.

In order to solve the above-mentioned problems and achieve the object, in the temperature control device for the molding roll according to the present invention, a heat medium flow path, which is a heat medium flow path, is formed inside and flows through the heat medium flow path. A molding roll capable of exchanging heat with the heat medium, a return path connected to the heat medium flow path, and a return path through which the heat medium flowing out of the heat medium flow path, and a return path flowing into the heat medium flow path. The inflow is based on a heat medium path having an inflow path through which the heat medium flows, a return temperature sensor that detects the temperature of the heat medium flowing through the return path, and the temperature of the heat medium detected by the return temperature sensor. A flow rate adjusting unit for adjusting the flow rate of the heat medium flowing into the heat medium flow path from the path is provided.

The temperature control device for a molding roll according to the present invention has an effect that the temperature can be controlled with higher accuracy.

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

Hereinafter, embodiments of the temperature control device for the molding roll according to the present disclosure will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily conceived by those skilled in the art, or those that are substantially the same.

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

Of 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 melt-kneads the resin material, which is the raw material of the molding sheet S to be molded by the molding apparatus 1, supplied from the raw material supply apparatus (not shown). 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 made into a slurry by stirring with the two screws, and then melt-kneaded. The extruder 11 performs homogeneous and uniform melt-kneading by stirring the resin material with a screw as described above. The resin material melt-kneaded by the extruder 11 is sent to the T-die 12 in a molten state through the connecting pipe 13.

The T-die 12 can be spread out in a sheet shape by discharging the molten resin material supplied from the extruder 11 from a slit-shaped discharge port (not shown). The extrusion unit 10 supplies the molten resin material to the molding roll unit 20 in a state of being spread in a sheet shape by the T-die 12.

The molding roll unit 20 has 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 can rotate around the central axis of the cylinder. That is, the first roll 21, the second roll 22, and the third roll 23 can rotate with the central axes of the cylinders as rotation axes 21r, 22r, and 23r, respectively.

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

Further, in the first roll 21, the second roll 22, and the third roll 23, the extending directions of the rotating shafts 21r, 22r, and 23r are 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 molding roll unit 20, the portion between the first roll 21 and the second roll 22, that is, the portion where the outer peripheral surface of the first roll 21 and the outer peripheral surface of the second roll 22 are closest to each other is T. It is arranged below the T-die 12 in a positional relationship that is located below the discharge port of the die 12. At that time, since the first roll 21 and the second roll 22 are arranged so that the extending directions of the rotating shafts 21r and 22r are parallel to the longitudinal direction of the discharge port of the T-die 12, respectively, the first roll 21 and the second roll 22 are arranged. The gap between the outer peripheral surface of the 21 and the outer peripheral surface of the second roll 22 is also formed so as to extend in a direction parallel to the longitudinal direction of the discharge port of the T-die 12.

Of the first roll 21, the second roll 22, and the third roll 23 arranged as described above, the first roll 21 and the second roll 22 are portions facing each other on their outer peripheral surfaces. Is rotatable about the rotation shafts 21r and 22r in the direction from the upper side to the lower side. Further, in the third roll 23, the portion of the outer peripheral surface facing the first roll 21 can rotate about the rotation shaft 23r in the direction from the lower side to the upper side.

The resin material supplied from the T-die 12 to the molding roll unit 20 in a sheet-like shape is pressed by both outer peripheral surfaces between the outer peripheral surface of the first roll 21 and the outer peripheral surface of the second roll 22. However, it is conveyed from above to below as the first roll 21 and the second roll 22 rotate. The resin material that has passed between the first roll 21 and the second roll 22 is further between the outer peripheral surface of the second roll 22 and the outer peripheral surface of the third roll 23, and the second roll 22 and the third roll 23. It is transported from the bottom to the top as it rotates.

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

<Molding roll 30>
FIG. 2 is a cross-sectional view of the molding roll 30 according to the embodiment. The second roll 22 included in the molding roll unit 20 is configured as a molding roll 30 described below. The molding roll 30 is formed in a substantially cylindrical shape, and is formed in a shaft shape with a roll main body portion 31 for molding the molding sheet S (see FIG. 1) on the outer peripheral surface 32 and a diameter smaller than that of the roll main body portion 31. It has roll support portions 33 arranged on both sides of the roll main body portion 31 in the axial direction. In the forming roll 30, the roll supporting portions 33 arranged on both sides in the axial direction of the roll main body portion 31 are supported by the outer bearing 51, respectively, whereby the forming roll 30 is rotatably supported by the outer bearing 51. ing. In this way, a rotation drive mechanism (not shown) such as a motor is connected to the molding roll 30 rotatably supported by the outer bearing 51, and the molding roll 30 is driven by a driving force given by the rotation drive mechanism. It is rotatable.

Further, the forming roll 30 includes a drive shaft 35 and a fixed shaft 36, and the roll main body portion 31 and the roll support portion 33 are portions of the drive shaft 35. In other words, the drive shaft 35 includes a roll main body portion 31 and a roll support portion 33, and is rotatable by a driving force given by a rotation drive mechanism. On the other hand, the fixed shaft 36 is arranged inside the drive shaft 35 in a non-rotatable state.

Specifically, the drive shaft 35 is formed in a substantially cylindrical shape, and 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. It is arranged inside the drive shaft 35 in a direction corresponding to the central axis of the cylinder of the drive shaft 35. It should be noted that these central axes coincide with the rotating shaft 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 position of the roll main body 31 on the drive shaft 35 to the inside of the roll support 33 of one of the two roll support 33s. Has been done. An inner bearing 52 is arranged between the fixed shaft 36 and the drive shaft 35 near both ends in the length direction of the fixed shaft 36, and the fixed shaft 36 is rotated relative to the drive shaft 35 by the inner bearing 52. It is freely arranged inside the drive shaft 35. That is, the drive shaft 35 can rotate relative to the fixed shaft 36, whereby the drive shaft 35 is the outer periphery of the fixed shaft 36 with respect to the fixed shaft 36 arranged in a non-rotatable state. It is rotatable on the side.

Inside the molding roll 30 formed as described above, a heat medium flow path 40, which is a heat medium flow path, and a heat pipe 41 for equalizing the temperature of the outer peripheral surface 32 of the molding roll 30 are provided. It is formed. The heat medium flow path 40 is formed in the shape of a passage through which the heat medium flows, and the molding roll 30 can exchange heat with the heat medium flowing through the heat medium flow path 40. In the present embodiment, the molding 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 is cooling water for cooling the molding roll 30. Further, the heat pipe 41 is filled with a gas-liquid two-phase heat medium, and is a portion for equalizing the temperature of the outer peripheral surface 32 of the molding roll 30 by the latent heat transfer of the heat 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 on the roll main body 31 of the drive shaft 35. Specifically, the heat pipe 41 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 at a position closest to the outer peripheral surface 32 of the roll main body 31. It is arranged from the vicinity of one end in the length direction of 31 to the vicinity of the other end. The heat pipe 41 forms a closed space by closing both ends in the length direction, and the heat medium sealed in the heat pipe 41 is sealed in the closed space. As the gas-liquid two-phase heat medium sealed in the heat pipe 41, for example, water is used.

The heat medium flow path 40 is formed from the roll main body portion 31 of the drive shaft 35 to the roll support portion 33 of the drive shaft 35 on the side where the fixed shaft 36 is not arranged inside. Specifically, the portion formed in the roll main body 31 in the heat medium flow path 40 is arranged at a position inside the roll main body 31 in the radial direction with respect to 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 shape extending in a direction parallel to the central axis of the cylinder of the roll main body 31, similar to the heat pipe 41. , The roll main body 31 is arranged from the vicinity of one end in the length direction to the vicinity of the other end.

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

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

FIG. 4 is a cross-sectional view taken along the line BB of 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 about the central axis of the cylinder in the drive shaft 35. ..

Further, on the fixed shaft 36 of the molding roll 30, a roll heater 45 capable of raising the temperature of the outer peripheral surface 32 of the molding roll 30 is arranged. The roll heater 45 is arranged in a portion of the fixed shaft 36 located inside the roll main body 31 of the drive shaft 35. The roll heater 45 is arranged at a position facing the inner peripheral surface of the roll main body 31 and is formed in a coil shape. By generating an induced current in the roll main body 31, the outer peripheral surface 32 of the forming roll 30 is formed. It is possible to raise it. That is, in the roll heater 45 formed in a coil shape, an alternating magnetic flux is generated when an AC voltage is applied, and the alternating magnetic flux passes through the roll main body 31 to generate an induced current in the roll main 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 rises. That is, the drive shaft 35 including the roll main body 31 is made of a metal material, and the roll heater 45 raises the temperature of the outer peripheral surface 32 by generating Joule heat with respect to the roll main body 31 made of the metal material. It is possible.

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

Further, the molding roll 30 is provided with a roll temperature sensor 46 that detects the temperature of the outer peripheral surface 32. The roll temperature sensor 46 is arranged on the roll main body 31 of the drive shaft 35, and is located at a position closest to the outer peripheral surface 32 of the roll main 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. By arranging the roll temperature sensor 46 at a position closest to the outer peripheral surface 32 of the roll main body 31 in this way, it is possible to detect the temperature of the outer peripheral surface 32. The roll temperature sensor 46 is electrically connected to the roll temperature sensor lead wire 62 arranged outside the molding roll 30 via a lead wire L2 and a rotary transformer 60.

Specifically, the rotary transformer 60 is arranged at the end opposite to the end of the forming roll 30 on the side where the rotary joint 55 is arranged, and the roll temperature sensor lead wire 62 rotates from the outside of the forming roll 30. It is connected to the transformer 60. Further, the lead wire L2 connected to the roll temperature sensor 46 is connected to the rotary transformer 60, and the rotary transformer 60 has a lead wire L2 that rotates integrally with the drive shaft 35 when the drive shaft 35 rotates, and a roll temperature. An electric signal can be sent to and from the sensor lead wire 62. As a result, the lead wire L2 and the roll temperature sensor lead wire 62 are electrically connected via the rotary transformer 60, that is, electrically connected to the roll temperature sensor 46.

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

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

Of these, the heat medium path 70 is a path of the heat medium connected to the heat medium flow path 40 (see FIG. 2) formed in the molding roll 30, and is 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 the cooling water flowing into the heat medium flow path 40 flows. The return path 71 and the inflow path 72 of the heat 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 forming roll is connected to the forming roll via the rotary joint 55. It is connected to the heat medium flow path 40 of 30. As a result, the cooling water flowing out from the heat medium flow path 40 can flow through 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 In between, the cooling water can flow from the inflow path 72 into the heat medium flow path 40. 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 molding roll 30 form a circulation path in which the cooling water circulates.

The temperature control device 84 included in the temperature control unit 105 can adjust 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 control device 84 includes a heat exchanger 85, a refrigerant flow path 86, a flow rate control valve 87, and a motor valve 88. Of 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 that exchanges heat with the cooling water flowing through the heat medium path 70 flows. 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 refrigerant flow path 86. ing. The flow rate adjusting valve 87 is arranged at a portion on the side where the refrigerant flows into the heat exchanger 85 in the refrigerant flow path 86, and is a valve that adjusts the flow rate of the refrigerant flowing through the refrigerant flow path 86. The motor valve 88 is a driving means for operating the flow rate adjusting valve 87 to adjust the opening degree of the flow rate adjusting valve 87. The temperature control device 84 can adjust the flow rate of the refrigerant flowing through the refrigerant flow path 86 by driving the motor valve 88 to operate 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 vessel 85 can be adjusted. As a result, the temperature control 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 arranged in the heat medium path 70, and the cooling water flowing through the heat medium path 70 can flow from the return path 71 side to the inflow path 72 side. As a result, the cooling water flowing out of the heat medium flow path 40 of the molding roll 30 flows into the heat medium flow path 40 again through the return path 71 and the inflow path 72. In the present embodiment, the pump 90 is arranged on the downstream side of the heat exchanger 85 in the flow direction of the cooling water flowing through the heat medium path 70.

The flow rate adjusting unit 95 can adjust the flow rate of the 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 for flowing cooling water from the inflow path 72 side to the return path 71, and the flow rate adjusting unit 95 three-way the flow rate of the cooling water flowing through the bypass path 75. By adjusting with the valve 96, the flow rate of the cooling water flowing from the inflow path 72 into the heat medium flow path 40 is adjusted. Specifically, the bypass path 75 connects the position on the downstream side of the pump 90 and the position on the upstream side 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 is a route through which cooling water can flow. Further, the flow rate adjusting unit 95 has a three-way valve 96 and a motor valve 97, and the three-way valve 96 is located on the downstream side of the pump 90 in the heat medium path 70, and has an inflow path 72 side and a bypass path 75. It is located in the part that branches to.

By arranging the three-way valve 96 at the portion branched to the bypass path 75 in this way, the cooling water flowing from the pump 90 side can be supplied only to the inflow path 72 side, only the bypass path 75 side, or the inflow path 72. It is possible to appropriately switch between branching to the side and the bypass path 75 side. Therefore, the three-way valve 96 can adjust the proportion of the cooling water flowing through the inflow path 72 and the proportion of the cooling water flowing through the bypass path 75 among the cooling water flowing from the return path 71 side. ing. The motor valve 97 can operate the three-way valve 96 configured in this way to switch the direction in which the cooling water flowing from the return path 71 side flows, and to adjust the flow ratio. As a result, the flow rate adjusting unit 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 arranged on the upstream side of the heat exchanger 85 in the flow direction of the cooling water flowing through the heat medium path 70, and can detect the temperature of the cooling water flowing through the return path 71. .. Further, the inflow temperature sensor 82 is arranged on the downstream side of the three-way valve 96 in the flow direction of the cooling water flowing through the heat medium path 70, and can detect the temperature of the cooling water flowing through the inflow path 72. There is.

Of 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 for adjusting the flow rate of the cooling water by the flow rate adjusting unit 95. That is, the flow rate adjusting 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 for adjusting the temperature of the cooling water by the temperature adjusting device 84. That is, the temperature control 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 arranged on the downstream side 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 arranged downstream of the three-way valve 96 of the flow rate adjusting unit 95, the flow rate of the cooling water flowing into the heat medium flow path 40 of the molding roll 30 through the inflow path 72 of the heat medium path 70. Can be detected.

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

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

Here, the molding roll 30, which is the second roll 22, can adjust the temperature of the outer peripheral surface 32 in which the resin material comes into contact. That is, the molding roll 30 can raise the temperature of the outer peripheral surface 32 by the roll heater 45, while 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 of the molding roll 30 according to the present embodiment, when molding the molding sheet S, the temperature of the outer peripheral surface 32 is set by the roll heater 45 before the resin material is supplied to the molding roll 30. The temperature is adjusted in advance to be suitable for molding, and cooling water is flowed through the heat medium flow path 40 of the molding roll 30. That is, by operating the pump 90 and operating the flow rate adjusting unit 95 so that the cooling water flows to the inflow path 72 side of the heat medium path 70, the heat medium flow path 40 and the heat medium path 70 of the molding roll 30 are operated. Cooling water is circulated between and.

While flowing cooling water through the heat medium flow path 40, the temperature of the outer peripheral surface 32 of the molding roll 30 is adjusted to a temperature suitable for molding the molding sheet S by the roll heater 45. At that time, since the heat pipe 41 in which the heat medium of the two phases of gas and liquid is sealed is formed in the roll main body 31 of the molding roll 30, the entire range in the length direction of the roll main body 31 is covered. The heat is efficiently transferred by the heat pipe 41, so that the temperature of the outer peripheral surface 32 of the molding roll 30 is made uniform. Further, when molding the molding sheet S, the resin material is supplied from the T die 12 in a state where the drive shaft 35 of the molding roll 30 is further rotated by the rotation drive mechanism. As a result, the resin material is conveyed to the third roll 23 side located on the downstream side of the molding roll unit 20 while being solidified, and is molded as a molding sheet S.

At that time, since the resin material is melted and supplied to the outer peripheral surface 32 of the molding roll 30 in a high temperature state, the temperature of the outer peripheral surface 32 rises when the high temperature resin material comes into contact with the outer peripheral surface 32. To do. Therefore, in the temperature control device 100 of the molding roll 30, the electric energy of the roll heater 45 is adjusted, and the flow rate and temperature of the cooling water circulating between the heat medium flow path 40 and the heat medium passage 70 of the molding roll 30 are adjusted. The temperature of the outer peripheral surface 32 of the molding roll 30 is kept within the temperature range suitable for molding the molding sheet S by adjusting the temperature. These adjustments are made based on the temperature of the outer peripheral surface 32 of the molding 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, when the temperature of the outer peripheral surface 32 of the molding roll 30 detected by the roll temperature sensor 46 is higher than a predetermined set temperature, the temperature of the outer peripheral surface 32 rises due to the induced current by reducing the electric energy of the roll heater 45. Or do not raise the temperature. When the temperature of the outer peripheral surface 32 of the molding roll 30 detected by the roll temperature sensor 46 is lower than the predetermined set temperature, the temperature of the outer peripheral surface 32 is increased by the induced current by increasing the electric energy of the roll heater 45. Raise.

Further, the temperature of the cooling water is set to the temperature of the cooling water detected by the inflow temperature sensor 82 by the temperature control 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 based on. Specifically, when the temperature of the cooling water detected by the inflow temperature sensor 82 is higher than the predetermined set temperature, the temperature control device 84 increases the flow rate of the refrigerant flowing through the refrigerant flow path 86, thereby increasing the flow rate of the refrigerant, so that the heat medium path 70 The degree of cooling when cooling the cooling water flowing through the heat exchanger 85 is increased. On the contrary, when the temperature of the cooling water detected by the inflow temperature sensor 82 is lower than the set temperature, the cooling water flowing through the heat medium path 70 is transferred by the heat exchanger 85 by reducing the flow rate of the refrigerant flowing through the refrigerant flow path 86. Decrease the degree of cooling when cooling.

That is, the heat medium path 70 circulates the cooling water with the heat medium flow path 40 of the molding roll 30, but the cooling water flowing through the heat medium flow path 40 exchanges heat with the molding roll 30. .. Therefore, when the temperature of the molding roll 30 is high, the temperature of the cooling water is also high, and when the temperature of the molding roll 30 is low, the temperature of the cooling water is also 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 molding roll 30 is also high. In this case, the cooling water flows through the refrigerant flow path 86. The flow rate of the refrigerant is increased by the flow rate adjusting valve 87 to increase the degree of cooling when the cooling water flowing through the heat medium path 70 is cooled by the heat exchanger 85. As a result, the temperature of the outer peripheral surface 32 of the molding roll 30 can be further lowered by the cooling water. Further, when 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 molding roll 30 is also low. In this case, the cooling water flows through the refrigerant flow path 86. The flow rate of the refrigerant is reduced by the flow rate adjusting valve 87 to reduce the degree of cooling when the cooling water flowing through the heat medium path 70 is cooled by the heat exchanger 85. As a result, the degree to which the temperature of the outer peripheral surface 32 of the molding roll 30 is lowered by the cooling water is lowered.

Further, the flow rate of the cooling water is the flow rate of the cooling water flowing into the heat medium flow path 40 from the inflow path 72 of the heat medium path 70, based on the temperature of the cooling water detected by the return temperature sensor 81, and the flow rate adjusting unit 95. Adjust by. Specifically, when the temperature of the cooling water detected by the return temperature sensor 81 is higher than the predetermined set temperature, the flow rate adjusting unit 95 determines the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40. When the temperature is increased and 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 reduced.

That is, 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 molding roll 30 has exchanged heat with the molding roll 30, so that the cooling water returns. When the temperature of the cooling water detected by the temperature sensor 81 is high, it indicates that the molding roll 30 has not been completely cooled at 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 through the heat medium flow path 40 of the molding roll 30 is increased, and the molding roll is filled with a large amount of cooling water. Allows 30 to cool.

Further, when the temperature of the cooling water detected by the return temperature sensor 81 is high, it indicates that the temperature of the cooling water tends to be high even in the heat medium flow path 40 of the molding roll 30. If the temperature of the cooling water becomes too high, the cooling water will boil and become steam, and the volume will expand rapidly, causing an impact noise and the pump 90 will not be able to operate stably. There is a risk of harmful effects. 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 through the heat medium flow path 40 of the molding roll 30 is increased to raise the temperature of the cooling water. Do not overdo it and prevent the cooling water from boiling into water vapor. In the present embodiment, the operation of adjusting the flow rate of the cooling water flowing through the heat medium flow path 40 of the molding roll 30 based on the temperature of the cooling water detected by the return temperature sensor 81 is prioritized over other adjustment operations. To do.

On the contrary, when the temperature of the cooling water detected by the return temperature sensor 81 is low, it indicates that the molding roll 30 is overcooled at 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 the predetermined set temperature, the flow rate of the cooling water flowing through the heat medium flow path 40 of the molding roll 30 is reduced to cool the molding roll 30. By reducing the amount of water, the forming roll 30 is not overcooled.

The flow rate of the cooling water in the flow rate adjusting unit 95 is adjusted by operating the three-way valve 96 by the motor valve 97. Specifically, when the temperature of the cooling water detected by the return temperature sensor 81 is higher than the predetermined set temperature, the three-way valve 96 is operated by the motor valve 97 to reduce the proportion of the cooling water flowing through the bypass path 75. And increase the proportion of cooling water flowing through the inflow path 72. On the other hand, when the temperature of the cooling water detected by the return temperature sensor 81 is lower than the predetermined set temperature, the flow rate adjusting unit 95 operates the three-way valve 96 by the motor valve 97 to flow the cooling water through the bypass path 75. The ratio is increased and the ratio of the cooling water flowing through 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 electric energy of the roll heater 45 that raises the temperature of the outer peripheral surface 32 of the molding roll 30. Also used. That is, the temperature control unit 105 can detect the amount of electric power supplied to the roll heater 45 and control the flow rate adjusting unit 95 and the temperature adjusting device 84 based on the detected electric power amount. ..

For example, when the amount of electric power of the roll heater 45 is large, it indicates that the temperature of the outer peripheral surface 32 of the molding roll 30 needs to be raised because the temperature of the outer peripheral surface 32 of the molding roll 30 is low. Therefore, in this case, the flow rate adjusting unit 95 adjusts the flow rate of the cooling water, and the temperature adjusting device 84 adjusts the temperature of the cooling water so that the temperature of the outer peripheral surface 32 of the molding roll 30 can be raised. To do. On the contrary, when the electric power of the roll heater 45 is small, it indicates that the temperature of the outer peripheral surface 32 of the molding roll 30 needs to be lowered because the temperature of the outer peripheral surface 32 of the molding roll 30 is high. Therefore, in this case, the flow rate adjusting unit 95 adjusts the flow rate of the cooling water, and the temperature adjusting device 84 adjusts the temperature of the cooling water so that the temperature of the outer peripheral surface 32 of the molding roll 30 can be lowered. To do.

Specifically, when the electric energy of the roll heater 45 is larger than the predetermined set electric energy, the flow rate adjusting unit 95 reduces the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40, and rolls. When the electric energy of the heater 45 is less than the set electric energy, the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40 is increased. That is, the flow rate adjusting unit 95 operates the three-way valve 96 by the motor valve 97 based on the electric energy of the roll heater 45, increases the ratio of the cooling water flowing through the bypass path 75, and flows the cooling water through the inflow path 72. The ratio is decreased, or the ratio of the cooling water flowing through the bypass path 75 is decreased to increase the ratio of the cooling water flowing through the inflow path 72.

Further, when the electric energy of the roll heater 45 is larger than the predetermined set electric energy, the temperature control device 84 lowers the degree of cooling when the cooling water is cooled by the heat exchanger 85, and the electric energy of the roll heater 45. When is less than the set electric energy, the degree of cooling when the cooling water is cooled by the heat exchanger 85 is increased. The temperature and flow rate of the cooling water are adjusted by referring not only to the temperature of the cooling water flowing through the heat medium path 70 but also to the electric energy of the roll heater 45 as described above.

As described above, the electric energy of the roll heater 45 is adjusted based on the temperature of the outer peripheral surface 32 of the molding roll 30, and the cooling water is cooled 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 and temperature, the detected values for a certain period of time are averaged and used. For example, the temperature of the outer peripheral surface 32 of the molding roll 30 detected by the roll temperature sensor 46 is obtained by averaging the detection results detected by the roll temperature sensor 46 for a certain period of time, and the temperature of the molding roll 30 detected 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 obtained 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, and the cooling water detected by the return temperature sensor 81. Used as temperature. At that 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 molding roll 30 detected by the roll temperature sensor 46. .. That is, the temperature of the cooling water detected by the return temperature sensor 81 is longer than the time for averaging the detection results of the roll temperature sensor 46, and the detection result of the temperature of the cooling water detected by the return temperature sensor 81 is averaged. 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 molding 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. The degree is preferable. That is, the time for averaging the temperature of the cooling water detected by the return temperature sensor 81 is about several times or more the time for averaging the temperature of the outer peripheral surface 32 of the molding roll 30 detected by the roll temperature sensor 46. Is desirable. The temperature of the outer peripheral surface 32 of the molding roll 30 is adjusted by the roll heater 45, and the flow rate and temperature of the cooling water are adjusted by the flow rate adjusting unit 95 and the temperature adjusting device 84. Use the one that has been used.

<Effect of embodiment>
The temperature control device 100 of the molding roll 30 according to the above embodiment is connected to the return temperature sensor 81 for detecting the temperature of the cooling water flowing through the return path 71 of the heat medium path 70 and the heat medium flow path 40 of the molding roll 30. Since the flow control unit 95 for adjusting the flow rate of the inflowing cooling water is provided, the flow rate of the cooling water flowing into the heat medium flow path 40 of the molding roll 30 is adjusted based on the temperature of the cooling water flowing through the return path 71. be able to. As a result, it is possible to prevent the temperature of the cooling water flowing through the heat medium flow path 40 of the molding roll 30 from becoming too high, and it is possible to prevent the cooling water from boiling to become steam. As a result, the temperature can be controlled with higher accuracy.

Further, since the inflow temperature sensor 82 for detecting the temperature of the cooling water flowing through the inflow path 72 included in the heat medium path 70 and the temperature control device 84 for adjusting the temperature of the cooling water flowing through the inflow path 72 are provided, the inflow path 72 is provided. 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. As a result, it is possible to prevent the temperature of the cooling water flowing through the heat medium flow path 40 of the molding roll 30 from becoming too high or too low in order to cool the molding roll 30, and the outer peripheral surface 32 of the molding roll 30 can be prevented from becoming too high or too low. The temperature can be more reliably set to a temperature suitable for molding the molding sheet S. As a result, the temperature can be controlled with higher accuracy.

Further, when the temperature of the cooling water detected by the inflow temperature sensor 82 is higher than the predetermined set temperature, the temperature control device 84 increases the degree of cooling of the cooling water, so that the temperature of the outer peripheral surface 32 of the molding roll 30 is high. It is possible to prevent it from becoming too much. As a result, when molding the molding sheet S, for example, even in a situation where the temperature of the outer peripheral surface 32 tends to increase due to contact of the high-temperature resin material with the outer peripheral surface 32 of the molding roll 30, the temperature of the outer peripheral surface 32 can be adjusted. It can be lowered in a short time, and the resin material can be appropriately cooled and solidified. Further, in the temperature control device 84, when the temperature of the cooling water detected by the inflow temperature sensor 82 is lower than the predetermined set temperature, the degree of cooling of the cooling water is lowered, so that the temperature of the outer peripheral surface 32 of the molding roll 30 is low. It is possible to prevent it from becoming too much. As a result, when molding the molding sheet S, for example, the temperature of the resin material in contact with the outer peripheral surface 32 of the molding roll 30 is relatively low, so that the outer circumference of the resin material is solidified too quickly. The temperature of the surface 32 can be easily raised, and the resin material can be prevented from being cooled and solidified too quickly. As a result, the temperature can be controlled with higher accuracy, and the molding sheet S can be molded more appropriately.

Further, the molding roll 30 has a roll heater 45 and a roll temperature sensor 46, and the roll heater 45 has an outer circumference of the molding roll 30 based on the temperature of the outer peripheral surface 32 of the molding roll 30 detected by the roll temperature sensor 46. Since the temperature of the surface 32 is adjusted, the temperature of the outer peripheral surface 32 can be adjusted more directly. As a result, the temperature of the outer peripheral surface 32 of the molding roll 30 can be set to a temperature suitable for molding the molding sheet S with higher accuracy. As a result, the temperature can be controlled with higher accuracy.

Further, when the electric energy of the roll heater 45 is larger than the predetermined set electric energy, the flow rate adjusting unit 95 reduces the flow rate of the cooling water flowing through the inflow path 72 toward the heat medium flow path 40, so that the forming roll 30 In a situation where the electric energy of the roll heater 45 increases due to the low temperature of the outer peripheral surface 32, the amount of cooling by the cooling water can be reduced. As a result, the amount of electric power when the temperature of the outer peripheral surface 32 of the molding roll 30 is raised by the roll heater 45 can be suppressed as much as possible. Further, when the electric energy of the roll heater 45 is less than the predetermined set electric energy, the flow rate adjusting 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 forming roll 30 In a situation where the electric energy of the roll heater 45 is suppressed because the temperature of the outer peripheral surface 32 of the roll heater 45 is high, the amount of cooling by the cooling water can be increased. As a result, the temperature of the outer peripheral surface 32 of the molding roll 30 whose temperature has risen can be lowered at an early stage by the cooling water. As a result, the temperature of the outer peripheral surface 32 of the molding roll 30 can be more reliably set to an appropriate temperature while suppressing the power consumption of the roll heater 45.

Further, in the temperature control device 84, when the electric energy of the roll heater 45 is larger than the predetermined set electric energy, the degree of cooling of the cooling water is lowered, so that the temperature of the outer peripheral surface 32 of the molding roll 30 is low, so that the roll heater 84 rolls. In a situation where the electric energy of the heater 45 is large, the amount of cooling by the cooling water can be reduced. As a result, the amount of electric power when the temperature of the outer peripheral surface 32 of the molding roll 30 is raised by the roll heater 45 can be suppressed as much as possible. Further, in the temperature control device 84, when the electric energy of the roll heater 45 is less than the predetermined set electric energy, the degree of cooling of the cooling water is increased, and therefore the temperature of the outer peripheral surface 32 of the molding roll 30 is high, so that the roll heater In the situation where the electric energy of 45 is suppressed, the amount of cooling by the cooling water can be increased. As a result, the temperature of the outer peripheral surface 32 of the molding roll 30 whose temperature has risen can be lowered at an early stage by the cooling water. As a result, the temperature of the outer peripheral surface 32 of the molding roll 30 can be more reliably set to an appropriate temperature while suppressing the power consumption of the roll heater 45.

Further, the temperature of the outer peripheral surface 32 of the molding 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 it is used as the detection value to be used, hunting caused by the frequent change of the detection value in a short 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 prevent the control from becoming complicated. it can. That is, the adjustment of the flow rate of the cooling water performed by using the detection result of the return temperature sensor 81 is the temperature adjustment of the outer peripheral surface 32 of the molding roll 30 by the roll heater 45 performed by using the detection result of the roll temperature sensor 46. The responsiveness of the temperature change of the outer peripheral surface 32 when the adjustment is performed is lower than that of the above. 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 molding roll 30 can be adjusted. The frequency of control can be reduced while ensuring the effectiveness of the adjustment. As a result, the temperature can be controlled with higher accuracy while simplifying the control.

Further, the heat medium path 70 has a bypass path 75, and the flow rate adjusting unit 95 adjusts the ratio of the cooling water flowing through the inflow path 72 and the ratio of the cooling water flowing through the bypass path 75, thereby adjusting the inflow path 72. Since the flow rate of the cooling water flowing into the heat medium flow path 40 of the molding roll 30 is adjusted, the flow rate of the cooling water flowing through the heat medium flow path 40 can be easily adjusted. Further, since the cooling water that does not flow to the heat medium flow path 40 side of the molding roll 30 flows to the return path 71 side, the temperature of the cooling water is increased by exchanging heat with the molding 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 cooling water in the return path 71, which has a high temperature, with the cooling water from the bypass path 75. As a result, the cooling water after heat exchange with the molding roll 30 flows, so that the temperature of the cooling water in the return path 71 in which the high-temperature cooling water easily flows can be lowered, and the temperature is high. It is possible to prevent the cooling water from boiling and becoming water vapor due to the excessive temperature. As a result, the temperature can be controlled more easily and with high accuracy.

Further, when the temperature of the cooling water detected by the return temperature sensor 81 is higher than the predetermined set temperature, the flow rate adjusting 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 peripheral surface 32 of the forming roll 30 from becoming too high. As a result, when molding the molding sheet S, for example, even in a situation where the temperature of the outer peripheral surface 32 tends to increase due to contact of the high-temperature resin material with the outer peripheral surface 32 of the molding roll 30, the temperature of the outer peripheral surface 32 can be adjusted. It can be lowered 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 the predetermined set temperature, the flow rate adjusting 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 peripheral surface 32 of the forming roll 30 from becoming too low. As a result, when molding the molding sheet S, for example, the temperature of the resin material in contact with the outer peripheral surface 32 of the molding roll 30 is relatively low, so that the outer circumference of the resin material is solidified too quickly. The temperature of the surface 32 can be easily raised, and the resin material can be prevented from being cooled and solidified too quickly. As a result, the temperature can be controlled with higher accuracy, and the molding sheet S can be molded more appropriately.

[Modification example]
In the above-described embodiment, the temperature control device 84 only lowers the temperature of the cooling water, but the temperature control device 84 may use a heater that heats the cooling water. That is, the temperature control device 84 not only cools the cooling water flowing through the heat medium path 70, but also heats the cooling water flowing through the heat medium path 70 with a heater to raise the temperature of the outer peripheral surface 32 of the molding roll 30. It may be used as an auxiliary when the molding sheet S is formed, or may be used for controlling the temperature of the cooling water during molding of the molding sheet S.

Further, in the above-described embodiment, the flow rate adjusting unit 95 has a three-way valve 96 and a motor valve 97, and by adjusting the ratio of the cooling water flowing through the bypass path 75, the flow rate of the cooling water flowing through the inflow path 72. However, the flow rate adjusting unit 95 may have a configuration other than this. The flow rate adjusting unit 95 may be configured by using, for example, a pump 90 that can adjust the flow rate of the cooling water for the pump 90 that sends the cooling water from the return path 71 to the inflow path 72. 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 the flow rate is adjusted by using a variable displacement pump. You may be able to do it. It is desirable that the flow rate adjusting unit 95 can continuously adjust the flow rate of the cooling water flowing through the inflow path 72 regardless of the configuration of the flow rate adjusting unit 95.

Further, in the above-described embodiment, the cooling water is configured to circulate between the heat medium flow path 40 and the heat medium passage 70 of the molding roll 30, but the cooling water does not have to circulate. For example, the return path 71 and the inflow path 72 of the heat medium path 70 are separated without being connected, and the cooling water flowing out from the heat medium flow path 40 of the molding roll 30 to the return path 71 is drained from the return path 71. May be good. In this case, the cooling water flowing from the inflow path 72 into the heat medium flow path 40 of the molding roll 30 is detected by the return temperature sensor 81, for example, by allowing tap water to flow into the heat medium flow path 40 from the inflow path 72. The flow rate adjusting unit 95 that adjusts the flow rate of the cooling water based on the temperature of the cooling water may adjust the flow rate of tap water.

FIG. 6 is a modified example of the temperature control device 100 of the molding roll 30 according to the embodiment, and is an explanatory view showing a state in which the heat insulating material 40a is arranged in the heat medium flow path 40. Further, in the above-described embodiment, the heat medium flow path 40 of the molding roll 30 is a hole-shaped passage formed in the drive shaft 35 made of a metal material, but the heat medium flow path 40 is inside. The heat insulating material 40a may be inserted so that the cooling water flowing through the heat medium flow path 40 and the metal portion forming the drive shaft 35 do not come into direct contact with each other. That is, when the cooling water boils and becomes steam, the pump 90 cannot be operated stably. Therefore, heat is exchanged between the molding roll 30 having a high temperature and the cooling water flowing through the heat medium flow path 40. It is necessary that the temperature of the cooling water does not exceed the boiling point even when the above is performed. 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 rate, the heat capacity of the cooling water increases. It may become too large and the temperature of the outer peripheral surface 32 of the molding roll 30 may become too low. If the diameter of the hole in the heat medium flow path 40 is reduced in order to suppress the heat capacity of the cooling water, the flow rate of the cooling water flowing through the heat medium flow path 40 is reduced and the heat capacity of the cooling water is reduced. By exchanging heat with 30, the temperature tends to rise, and there is a risk that the temperature tends to approach the boiling point.

On the other hand, when the heat insulating material 40a is put inside the heat medium flow path 40 so that the cooling water flowing through the heat medium flow path 40 and the metal portion forming the drive shaft 35 do not come into direct contact with each other, molding is performed. The heat of the roll 30 is less likely to be transferred to the cooling water, and the temperature of the cooling water is less likely to rise. As the heat insulating material 40a, it is preferable to use a member having a lower thermal conductivity and higher heat resistance than a 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 molding roll 30 to be transferred to the cooling water, the diameter of the hole in the heat medium flow path 40 is not reduced. , It is possible to prevent the temperature of the outer peripheral surface 32 of the forming roll 30 from becoming too low. As a result, it is possible to secure the flow rate of the cooling water and secure the heat capacity of the cooling water while suppressing the temperature of the outer peripheral surface 32 of the molding roll 30 from being lowered too much, so that the cooling performance itself by the cooling water is ensured. At the same time, it is possible to prevent the cooling water from boiling to become water vapor. As a result, the temperature can be controlled more reliably and with high accuracy.

Further, in the above-described embodiment, only the second roll 22 in the molding roll unit 20 is formed as the molding roll 30 for adjusting the temperature 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 molding roll 30 that adjusts the temperature by the temperature control device 100.

Further, in the above-described embodiment, the first roll 21, the second roll 22, and the third roll 23 of the molding roll unit 20 are arranged so that the rotation shafts 21r, 22r, and 23r extend 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, the second roll 22, and the third roll 23 of the molding roll unit 20 are arranged so that the rotating shafts 21r, 22r, and 23r extend in the vertical direction, and the rotating shafts 21r, 22r, and 23r are horizontal. It may be arranged so as to extend diagonally with respect to the direction and the vertical direction. If the molding roll unit 20 is configured so that the resin material supplied from the T die 12 can be molded as a molding sheet S having a desired thickness, the first roll 21, the second roll 22, and the third roll unit 20 are formed. The orientation of the roll 23 is not limited.

1 ... molding device, 10 ... extrusion unit, 11 ... extruder, 12 ... T die, 13 ... connection pipe, 20 ... molding roll unit, 21 ... first roll, 21r ... rotary shaft, 22 ... second roll, 22r ... Rotating shaft, 23 ... 3rd roll, 23r ... Rotating shaft, 30 ... Molding roll, 31 ... Roll body, 32 ... Outer surface, 33 ... Roll support, 35 ... Drive shaft, 36 ... Fixed shaft, 40 ... Heat medium Flow path, 40a ... Insulation 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 lead wire, 62 ... roll temperature sensor lead wire, 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 controller, 85 ... heat exchanger, 86 ... refrigerant flow path, 90 ... pump, 95 ... flow control unit, 96 ... three-way valve, 97 ... motor valve, 100 ... temperature control device, 105 ... temperature control unit, S ... molded sheet

Claims (9)

A molding roll in which a heat medium flow path, which is a heat medium flow path, is formed inside and heat can be exchanged 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 of the heat medium flow path flows 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 through the return path, and
A flow rate adjusting unit that adjusts the flow rate of the heat medium flowing from the inflow path into the heat medium flow path based on the temperature of the heat medium detected by the return temperature sensor.
A temperature control device for a molding roll, which comprises. An inflow temperature sensor that detects the temperature of the heat medium flowing through the inflow path, and
A temperature control 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 molding roll according to claim 1. When the temperature of the heat medium detected by the inflow temperature sensor is higher than a predetermined set temperature, the temperature control device increases the degree of cooling of the heat medium, and the temperature of the heat medium detected by the inflow temperature sensor. The temperature control device for a molding roll according to claim 2, wherein when the temperature is lower than the set temperature, the degree of cooling of the heat medium is lowered. A roll heater arranged on the molding roll and capable of raising the temperature of the outer peripheral surface of the molding roll,
A roll temperature sensor that detects the temperature of the outer peripheral surface of the molding roll, and
With
The molding roll according to any one of claims 1 to 3, wherein the roll heater adjusts the temperature of the outer peripheral surface of the molding roll based on the temperature of the outer peripheral surface of the molding roll detected by the roll temperature sensor. Temperature control device. When the electric energy of the roll heater is larger than a predetermined set electric energy, the flow rate adjusting unit reduces the flow rate of the heat medium flowing through the inflow path toward the heat medium flow path, and reduces the electric energy of the roll heater. The temperature control device for a molding roll according to claim 4, wherein when the amount is less than the set electric energy, the flow rate of the heat medium flowing through the inflow path toward the heat medium flow path is increased. A temperature control device for adjusting the temperature of the heat medium flowing through the inflow path is provided.
The temperature control device reduces the degree of cooling of the heat medium when the electric energy of the roll heater is larger than a predetermined set electric energy, and the heat when the electric energy of the roll heater is less than the set electric energy. The temperature control device for a molding roll according to claim 4 or 5, which increases the degree of cooling of the medium. The temperature of the outer peripheral surface of the molding roll detected by the roll temperature sensor is the temperature of the outer peripheral surface of the molding roll detected by the roll temperature sensor, which is an average of the detection results detected by the roll temperature sensor for a certain period of time. Used as
The temperature of the heat medium detected by the return temperature sensor is longer than the time for averaging the detection results of the roll temperature sensor, and the detection result of the temperature of the heat medium detected by the return temperature sensor is averaged. The temperature control device for a molding roll according to any one of claims 4 to 6, wherein the temperature of the heat medium detected by the return temperature sensor is used. The heat medium path has a bypass path for flowing the heat medium from the inflow path side to the return path.
The flow rate adjusting unit adjusts the ratio of the heat medium flowing through the inflow path and the ratio of the heat medium flowing through the bypass path to the heat medium flowing from the return path side. The temperature control device for a molding roll according to any one of claims 1 to 7, wherein the flow rate of the heat medium flowing into the heat medium flow path from the inflow path is adjusted. When the temperature of the heat medium detected by the return temperature sensor is higher than a predetermined set temperature, the flow rate adjusting unit increases the flow rate of the heat medium flowing through the inflow path toward the heat medium flow path. When the temperature of the heat medium detected by the return temperature sensor is lower than the set temperature, any one of claims 1 to 8 for reducing the flow rate of the heat medium flowing through the inflow path toward the heat medium flow path. The temperature control device for a molding roll according to item 1.

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