JP5717913B1 - Thickness gauge and roll press machine provided with the thickness gauge - Google Patents

Abstract

Disclosed are a thickness meter capable of measuring the thickness of a sheet with high accuracy while suppressing the influence of heat from the roll or the sheet, and a roll press machine including the thickness gauge. SOLUTION: A sheet 11 in which an active material is coated on one or both sides of a base material 11b made of a metal foil is used in a roll press machine 1 that compresses a sheet 11 with a pair of pressure rolls 2, and after the compression process. The thickness meter 3 for measuring the thickness of the sheet 11 includes a measurement sensor unit 31 arranged so as to be paired above and below the sheet 11, a frame for supporting each measurement sensor unit 31, and a side surface shape supported by the frame 33. Is provided with a substantially L-shaped heat shield 35, and the front surface of the heat shield 35 facing in the conveyance direction of the sheet 11 is arranged to cover each measurement sensor unit 31 and the frame 33. [Selection] Figure 4

Description

  The present invention relates to a roll press machine used for compression processing of electrode materials for lithium ion secondary batteries, and more particularly to a thickness meter for measuring the thickness of a sheet after compression processing and a roll press machine using the thickness gauge.

  In a roll press machine, for example, a sheet processing material such as an electrode material for a secondary battery is required to have a strict processing accuracy of ± 1.0 to 2.0 μm. Accordingly, the thickness measurement accuracy of the sheet coated with the active material on one side or both sides of the base material made of metal foil is 1/10 of that, that is, an allowable measurement error range of ± 0.1 to 0.2 μm. It is necessary to fit in.

  Patent Document 1 is known as a roll press machine that measures the thickness of a sheet with high accuracy. In patent document 1, the sheet | seat which has the coating part by which the active material was coated on the single side | surface or both surfaces of a base material, and the non-coating part which exists in the both ends of the width direction of a base material is made into a pair of press roll. At the time of compression processing, attention is paid to the fact that sagging occurs in the longitudinal direction of the sheet, and this sagging causes wrinkles, which hinders high accuracy of sheet thickness measurement. For this reason, the elastic guide rolls are installed upstream and / or downstream of a pair of thickness measurement sensors that are disposed opposite to each other across the sheet. By deforming the elastic guide roll when it comes into contact with the sheet, the roll surface of the elastic guide roll comes into contact with the coating part, and by applying tension to the coating part, the thickness of the sheet without wrinkles can be reduced. It is possible to measure.

Japanese Patent No. 5411371

  The configuration disclosed in Patent Document 1 is expected to enable highly accurate thickness measurement because the thickness of the sheet can be measured without sagging or wrinkles. However, in a roll press machine, a pair of pressure rolls (main rolls) may be used after being heated to about 150 degrees, for example, and a preheating roll is installed upstream of the pair of pressure rolls, The point that the convection and radiant heat from the preheating roll or the pressure roll and the convection and radiant heat from the sheet affect the measurement accuracy of the pair of thickness measurement sensors is not considered, and there is room for improvement.

  The pair of thickness measurement sensors are supported by a frame so as to be opposed to each other above and below the sheet. When the frame is thermally deformed due to the influence of the convection heat or the radiant heat, a position shift occurs between the thickness measurement sensors arranged opposite to each other, and it may be difficult to realize highly accurate thickness measurement.

  Then, this invention is providing the thickness press which suppresses the influence of the heat from a roll or a sheet | seat, and enables the thickness measurement of a highly accurate sheet | seat, and a roll press machine provided with the same.

In order to solve the above problems, the thickness gauge of the present invention is used in a roll press machine that compresses a sheet of an active material coated on one or both sides of a base material made of metal foil with a pair of pressure rolls. A thickness meter for measuring the thickness of a sheet after compression processing, wherein the thickness meter sandwiches the sheet and is arranged so as to form a pair above and below the frame, and a frame that supports each of the measurement sensor units And a heat shield that is supported by the frame and has an L -shaped side surface, and the front surface of the heat shield facing the sheet conveyance direction and the bottom surface facing the sheet are the measurement sensor units and the frame. It is arranged so that it may cover.

The roll press machine of the present invention winds a sheet coated with an active material on one side or both sides of a base material made of metal foil, and rotates by being supported by an unwinder that unwinds the sheet and a rolling bearing. A pair of pressure rolls having a pressure roll shaft and continuously compressing the sheet; a winder that winds the compressed sheet and generates a winding coil; and the pair of pressure rolls And a thickness meter for measuring the thickness of the compressed sheet, and a load applied to the pressure roll based on the thickness measurement value of the sheet by the thickness meter. and a control panel, wherein the thickness gauge, a measuring sensor unit which is arranged so as to form a pair on the upper and lower sandwiching the seat, a frame for supporting the respective sensor part, the side shape is supported by the frame It has an L-shaped heat shield Front and the sheet facing the bottom surface of the heat shield facing the conveying direction of the sheet, the arranged to cover the sensor part and the frame, convection emitted from said pair of pressure rolls and radiant heat and / or The convection and radiant heat generated from the sheet are shielded.

  ADVANTAGE OF THE INVENTION According to this invention, the influence of the heat from rolls, such as a preheating roll or a heated pressure roll, and the heat | fever from the sheet | seat pressed by compression is suppressed, and the thickness measurement of a sheet | seat with high precision is attained.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is the whole schematic block diagram of a roll press provided with the thickness meter concerning one embodiment of the present invention. It is a front view of a pair of pressure roll shown in FIG. It is a cross-sectional view and a top view of a sheet that is continuously compressed by a pair of pressure rolls. It is a schematic block diagram of the thickness meter of Example 1 which concerns on one Example of this invention, and is an enlarged view of the area | region A shown in FIG. It is the front view which looked at the thickness meter shown in FIG. 4 from the B direction shown by the arrow. It is a graph which shows the relationship between flame | frame preheating time and flame | frame temperature in the thickness meter of Example 2 which concerns on the other Example of this invention. 6 is an operation timing chart of a roll press machine having a thickness meter of Example 2. It is the modification of the thickness meter shown in FIG. 5, and is the front view.

  FIG. 1 is an overall schematic configuration diagram of a roll press equipped with a thickness meter according to an embodiment of the present invention. For example, as shown in FIG. 3, the roll press machine 1 applies an active material on both surfaces of a base material 11b made of a conductive metal foil such as an aluminum foil or a copper foil as an electrode material for a lithium ion secondary battery. This is a facility for continuously compressing the sheet 11 having the coated portion 11a and the non-coated portion 11c so as to increase the density of the active material and to obtain a uniform thickness.

  As shown in FIG. 1, the roll press machine 1 has an unwinding machine 4 for winding a winding coil of a sheet 11 having a length of about 500 m, for example, and a sheet 11 fed from the unwinding machine 4 from the upstream side. The upstream conveying mechanism 6 for conveying, a preheating roll 10 for preheating the sheet 11, a pair of pressure rolls 2 (upper pressure roll, lower pressure roll) for compressing while heating the sheet 11, compressed A downstream conveyance mechanism 7 that conveys the sheet 11 and a winder 5 that winds the compressed sheet 11 and generates a winding coil are provided.

  The upstream side transport mechanism 6 includes a plurality of guide rolls 8 and dancer rolls 9, and the rotation axis of the dancer rolls 9 is configured to be able to displace an arcuate track up and down around a support point. The dancer roll 9 displaces the arc-shaped track up and down, thereby applying a predetermined tension (appropriate tension) to the sheet 11 and cooperating with the guide roll 8 to convey the sheet 11 to the preheating roll 10.

  Similarly, the downstream transport mechanism 7 includes a plurality of guide rolls 8, dancer rolls 9, and thickness gauges 3. A predetermined tension is applied to the sheet 11 by the dancer roll 9 moving up and down along the arcuate track. The thickness meter 3 installed between the two guide rolls is given a predetermined tension by the dancer roll 9 and measures the thickness of the sheet 11 when passing through the thickness meter 3. Here, as the measurement sensor unit constituting the thickness meter 3, for example, a triangulation laser displacement sensor, a coaxial confocal laser displacement sensor, or the like is used. The measurement sensor units constituting the thickness gauges 3 are disposed so as to be paired vertically with the conveyed sheet 11 interposed therebetween, and the thickness of the sheet 11 is obtained based on the distance measured by each measurement sensor unit. For example, by arranging a plurality of pairs of measurement sensor units along the width direction of the sheet 11, or when the pair of measurement sensor units travels in the width direction of the sheet 11, the thickness distribution of the sheet 11 in the width direction. Based on the thickness measurement result, the control panel 12 controls the load applied to the pressure roll 2 by a pressurization mechanism to be described later, so that the thickness is uniform in the longitudinal direction and the width direction. The sheet | seat 11 which has is obtained.

  Although the details will be described later, the thickness meter 3 having a pair of measurement sensor units that are opposed to each other with the sheet 11 interposed therebetween is on the side facing the flow of the sheet 11 being conveyed, that is, in the immediate vicinity of the measurement sensor unit. And it has a heat shield on the upstream side. Further, the thickness meter 3 further includes a heat shield on the surface side facing the front surface or the back surface of the sheet 11 of the pair of opposingly arranged measurement sensor units, and each of the heat shields is emitted from the measurement sensor unit. And an aperture having a diameter larger than the condensing diameter of the laser beam. Thus, the heat shield has a substantially L-shaped side surface viewed from the width direction of the sheet 11. As a result, the heat and radiant heat generated from the pair of pressure rolls 2 and / or the preheating roll 10 disposed on the upstream side of the thickness gauge 3 and convection toward the thickness gauge 3 are shielded. Further, convection and radiant heat from the sheet 11 passing between a pair of opposingly arranged measurement sensor units are similarly shielded by the heat shield. Therefore, the influence of the convection heat and radiant heat on the thickness meter 3 is suppressed.

  Here, the control panel 12 is a memory comprising, for example, a ROM (not shown) for storing various programs, a read / write RAM for storing calculation process data and / or data used for calculation, an external storage device such as an HDD, and the like. A device, a processor such as a CPU that reads and executes a program stored in a ROM, an input interface unit that captures measurement values from various sensors, a calculation result by the processor, or a control command (control amount) based on the calculation result to a control target It consists of an output interface unit that outputs.

  In FIG. 1, the number of the guide rolls 8 is described in a small number for convenience of explanation. However, for example, the number of guide rolls 8 is not limited to the number illustrated in the figure, and 10 in each of the upstream side transport mechanism 6 and the downstream side transport mechanism 7. It is good also as a structure which provides 30 guide rolls 8 from the book. In FIG. 1, the dancer roll 9 and the preheating roll 10 are shown separately from the guide roll 8, but the dancer roll 9 and the preheating roll 10 may be referred to as the guide roll 8.

  FIG. 2 shows a front view of the pair of pressure rolls 2. A pair of pressure rolls 2 (upper pressure roll, lower pressure roll) arranged opposite to each other are a rolling bearing 22 that supports each pressure roll shaft 20 at both ends thereof, and a bearing that holds the rolling bearing 22. The housing 21 that holds the box 23 and the bearing box 23 is rotatable. Further, a pressurizing mechanism configured by, for example, a hydraulic cylinder or the like between a bearing box 23 that holds a rolling bearing 22 that supports both ends of the pressurizing roll shaft 20 of the lower pressurizing roll and a lower portion of the housing 21. 24 is arranged. The control panel 12 takes in the thickness of the sheet 11 measured by the thickness gauge 3 via the signal line 37, and when there is a deviation between the measured thickness and a target value (target thickness), a pair of the deviation can be canceled out. A gap between the pressure rolls 2 and a load applied to the pressure roll 2 are obtained and output to the pressure mechanism 24 via a signal line 38 as a load adjustment command value. In accordance with the received load adjustment command value, for example, the pressurizing mechanism 24 moves up and down at a stroke corresponding to the load adjustment command value.

  Moreover, the pressure roll 2 in this embodiment is, for example, a metal roll, and a roll having a roll diameter of 300 to 800 mmφ and a representative example having a roll diameter of 500 mmφ is used. 1 and 2, the sheet 11 is continuously compressed by a pair of pressure rolls 2 while being conveyed at a conveyance speed of, for example, about 50 to 100 m / min. At this time, for example, the pair of pressure rolls 2 may use heating rolls that generate heat at about 80 ° C. to 180 ° C. The heat generated by the pressure roll 2 is convected and radiated to the thickness gauge 3 disposed on the downstream side. However, according to the thickness meter 3 of the present embodiment, the convection and radiant heat are shielded by the heat shield provided in the thickness meter 3 as described above, so that the measurement accuracy of the thickness meter 3 is not lowered. Absent.

  The thickness Tb of the base material 11b made of the metal foil shown in FIG. 3 is, for example, about 15 μm. The thickness including the coating portion 11a in which the active material is applied on both surfaces of the base material 11b, that is, the thickness of the sheet 11 The thickness Ta is about 150 μm before compression processing. The sheet 11 having a thickness of about 150 μm is compressed to about 100 μm by the compression processing by the pair of pressure rolls 2. Thereby, the density of the coating part 11a of both surfaces, ie, an active material, improves. On the other hand, as described above, the compression processing accuracy of the sheet 11 is required to be strict processing accuracy of ± 1.0 to 2.0 μm. Along with this, the thickness measurement accuracy of the sheet 11 in which the active material is coated on one side or both sides of the base material 11b made of metal foil is 1/10, that is, an allowable measurement error of ± 0.1 to 0.2 μm. Must be within the range. This also shows how important it is to suppress the influence of the convection and radiant heat and / or convection and radiant heat from the sheet 11 on the thickness meter 3.

  In addition, as shown in FIG. 3, the sheet | seat 11 has the non-coating part 11c from which the base material 11b is exposed, without applying an active material to the width direction both ends. In FIG. 3, although the sheet | seat 11 which has the coating part 11a on both surfaces of the base material 11b is shown as an example, the sheet | seat 11 is not restricted to this, The thing which has the coating part 11a only on the single side | surface of the base material 11b is also included.

  Further, the thickness meter 3 according to the present embodiment supports a pair of measurement sensor units constituting the thickness meter 3 described later in detail, in addition to the configuration including the above-described heat shield, and preheats a frame positioned so as to face each other. It has a configuration. By preheating the frame and stabilizing it after the temperature rises, the temperature change of the frame is eliminated, and thermal deformation of the frame is prevented. Thereby, it is possible to prevent the occurrence of positional deviation between the pair of opposedly arranged measurement sensor units 31, and it is possible to improve the accuracy of the thickness measurement of the sheet 11.

  Hereinafter, embodiments of the present invention for preheating the thickness gauge 3 provided with the heat shield and the frame will be described in detail with reference to the drawings.

  FIG. 4 is a schematic configuration diagram of a thickness gauge according to the first embodiment of the present invention, and is an enlarged view of a region A shown in FIG. As shown in FIG. 4, the thickness gauge 3 is a frame that supports a measurement sensor unit 31 having a laser light source and a condenser lens (not shown), a heater 34, and the measurement sensor unit 31 so that the sheet 11 is sandwiched between and opposed to each other. 33, a heat shield 35, and a support member 36 for fixing the heat shield 35 to the frame 33. The heater 34 is used to heat the frame 33 to a desired temperature.

  The side surface shape of the heat shield 35 viewed from the width direction of the sheet 11 is substantially L-shaped. A surface (front surface) of the heat shield 35 facing the direction in which the sheet 11 flows (conveying direction) is a flat plate having a size covering the measurement sensor unit 31, the frame 33, and the heater 34, and is made of resin. The member 36 is fixed to the frame 33. Moreover, the surface (bottom surface: sheet | seat opposing surface) which opposes the surface or back surface of the sheet | seat 11 among the heat shields 35 is similarly flat plate shape, and can pass the laser beam 32 radiate | emitted from the measurement sensor part 31. An opening having a diameter larger than the condensing diameter of the laser beam 32 is formed.

  The measurement sensor unit 31 includes a laser light source (not shown) having at least a laser oscillator and a condensing lens (not shown) that condenses the laser light 32 emitted from the laser light source. A displacement sensor or a coaxial confocal laser displacement sensor is used.

  The heat shield 35 is desirably made of resin, and is preferably formed of a metal-containing member having low thermal conductivity. However, you may form with a highly heat conductive metal material. This is because the heat shield 35 and the frame 33 are fixed by a resin support member 36. Even if the heat shield 35 is formed of a metal material having high thermal conductivity, the heat shield 35 and the frame 33 are interposed via the support member 36. Heat transfer to the frame 33 can be suppressed to an extent that does not affect the effect, and the effect of shielding convection and radiant heat and / or the effect of shielding convection and radiant heat from the sheet 11 can be achieved. The frame 33 is formed of a rigid metal material to support the measurement sensor unit 31.

  FIG. 5 is a front view of the thickness meter shown in FIG. 4 as seen from the B direction indicated by an arrow. As shown in FIG. 5, three pairs of measurement sensor units 31 and heaters 34 are separated at a predetermined interval in the width direction of the sheet 11 and supported by a frame 33 having a substantially U-shaped shape. Each heater 34 is electrically connected to the control panel 12 via a signal line 37, and is configured to be able to heat the frame 33 to a desired temperature in response to a command from the control panel 12. The measurement sensor units 31 that make a pair via the signal line 37 are electrically connected to the control panel 12, and the thickness measurement value of the sheet 11 is transferred to the control panel 12 from each pair of measurement sensor units 31. It can be sent.

  Further, the front surface of the heat shield 35 having a substantially L-shaped side surface, that is, the surface facing the direction in which the sheet 11 is conveyed is fixed by the support member 36. The support member 36 is preferably made of a resin having low thermal conductivity. It should be noted that the attachment of the support member 36 is desirable to minimize the influence of heat transfer by reducing the support points as much as possible. Further, FIG. 5 shows a configuration in which the heater 34 is attached to the frame 33 at one place on the upper side and one place on the lower side, but this is not restrictive. For example, if the frame 33 is formed of aluminum having high thermal conductivity and the temperature of the frame 33 can be stabilized when heated by the heater 34, one heater 34 may be attached to the frame 33. Further, a planar heater or a string heater may be used. That is, a desired number of heaters 34 may be attached to the frame 33 as appropriate.

  Further, as shown in FIG. 5, the front surface of the heat shield 35 has a width longer than the width of the sheet 11, and its height exceeds the height of the heater 34 installed on the frame 33. Have a size. Thereby, it is possible to prevent convection and radiant heat due to heat generated by the pressure roll 2 or the preheating roll 10 from entering the measurement sensor unit 31 and the frame 33. The bottom surface of the heat shield 35, that is, the surface facing the coating portion 11 a of the sheet 11 has a width longer than the width of the sheet 11. As shown in FIG. 4, the bottom surface of the heat shield 35 extends parallel to the sheet 11 toward the downstream side of the region where the frame 33 is positioned along the conveyance direction of the sheet 11. That is, the length along the conveyance direction of the sheet 11 on the bottom surface of the shield 35 is sufficiently long downstream from the installation position of the frame 33. Thereby, it is possible to prevent convection and radiant heat from the sheet 11 conveyed between the bottom surfaces of the paired heat shields 35 from entering the measurement sensor unit 31 and the frame 33.

  Although FIG. 5 shows an example in which three pairs of measurement sensor units 31 are arranged in the width direction of the sheet 11, the present invention is not limited thereto, and a pair of measurement sensor units 31 may be arranged. Conversely, a configuration may be adopted in which more measurement sensor units 31 are arranged in the width direction of the sheet 11. In this case, the thickness distribution in the width direction of the sheet 11 can be measured with higher accuracy.

  In the present embodiment, as shown in FIGS. 4 and 5, the thickness meter 3 having the heat shield 35 having a substantially L-shaped side surface has been described, but the present invention is not limited thereto. For example, it is good also as a structure which further shields the both sides | surfaces of the heat shield 35 of a side surface substantially L shape. In this case, even if convection occurs such that the radiant heat from the sheet 11 wraps around from both ends in the width direction of the sheet 11, the heat is reliably prevented from entering the measurement sensor unit 31 and the frame 33. it can.

  Further, the heat shield 35 is formed in a configuration that shields the downstream side of the sheet 11 in the conveyance direction, that is, the back surface, or further shields the top surface, that is, formed by four side surfaces, the top surface, and the bottom surface. You may do it. Thereby, the effect which prevents the penetration | invasion of the convective heat and the radiant heat from the sheet | seat 11 can be improved. However, in this case, as the shielding surface is increased, the support member 36 for fixing the shielding surface to the frame 33 is increased.

  Furthermore, as shown in FIG. 8, similarly, the shielding member 39 is also installed in the vertical connection portion of the U-shaped frame, so that the deformation of the frame 33 can be further reliably prevented. At this time, it is desirable to minimize the gap between the shield 35 and the shield 39. The necessity of installing the shield 39 at this location depends on the preheating roll 10 or the heated pressure roll 2, the compressed sheet 11, and the shape and positional relationship of the frame 33. It is only necessary to consider and decide.

  According to the present embodiment, convection and radiant heat from a roll such as the preheating roll 10 or the pressure roll 2 and convection and radiant heat from the compressed sheet 11 enter the measurement sensor unit 31 and the frame 33. Can be prevented. Thereby, the thermal deformation of the frame 33 due to the intrusion of the convection heat or radiant heat can be prevented, and the thickness of the sheet 11 can be measured with high accuracy.

  FIG. 6 is a graph showing the relationship between the frame preheating time and the frame temperature in the thickness gauge 3 of the second embodiment according to another embodiment of the present invention. FIG. 7 shows a roll including the thickness gauge 3 of the present embodiment. An operation timing chart of the press machine 1 is shown. The configuration itself of the thickness gauge 3 in the present embodiment is the same as that of the first embodiment, and the configuration of the roll press machine 1 is also the same as the configuration shown in FIGS. This embodiment is different from the first embodiment in that the frame 33 is preheated to a predetermined temperature by the heater 34 shown in FIGS. 4 and 5.

  First, the measurement sensor unit 31 forming a pair constituting the thickness meter 3 shown in FIG. 5 takes about 30 minutes from the irradiation of the laser beam 32 until it can actually be measured. Hereinafter, the time from the irradiation of the laser beam 32 until the measurement becomes possible is referred to as a measurement sensor unit stabilization time Δt.

  The roll press machine 1 having the thickness gauge 3 of the present embodiment is configured to heat the frame 33 constituting the thickness gauge 3 according to a command from the control panel 12 before the start of continuous compression processing on the sheet 11 by the pair of pressure rolls 2. 34 is preheated to a predetermined temperature, and the temperature of the frame 33 is stabilized. Thereby, the position shift between the paired measurement sensor units 31 due to the thermal deformation caused by the temperature change of the frame 33 supporting the measurement sensor unit 31 and the occurrence of measurement error are suppressed.

  The preheating temperature for stabilizing the temperature of the frame 33 that supports the paired measurement sensor units 31 is set to a predetermined material, for example, when the frame 33 is formed of aluminum having high thermal conductivity, when the roll press machine 1 is in operation. Under the ambient temperature, the measurement sensor unit 31 constituting the thickness gauge 3 is operated, and the laser beam 32 is continuously emitted. Then, after the elapse of the measurement sensor unit stabilization time Δt from the start of emission of the laser beam 32, the heating temperature by the heater 34 is changed, and the thickness of a sample with a known thickness is measured by the paired measurement sensor units 31. Further, the position of the laser beam 32 emitted from the paired measurement sensor units 31 and focused on the front and back surfaces of the sample having a known thickness is measured, and whether or not the laser beam 32 is misaligned and the sample thickness is measured. Based on the above, the frame temperature rise stabilization temperature Ts is obtained. The frame temperature rise stabilization temperature Ts is a temperature at which the temperature of the frame 33 stabilizes after the temperature rises. There is no temperature change in the frame 33, and the laser beam 32 emitted from the paired measurement sensor units 31 is misaligned. This temperature does not occur.

The obtained frame temperature increase stabilization temperature Ts is stored in advance in a storage device (not shown) in the control panel 12 as a frame preheating pattern, which is a graph showing the relationship between the frame preheating time and the frame temperature shown in FIG. As shown in FIG. 6, it takes time t _A after the frame 33 is heated by the heater 34 until the frame temperature reaches the frame temperature rise stabilization temperature Ts. Accordingly, a frame preheating pattern in which the time t _A until the frame temperature rise stabilization temperature Ts reaches the measurement sensor unit stabilization time Δt, which is a constraint condition of the measurement sensor unit 31, is illustrated in the control panel 12 in advance. Store in a storage device that does not.

Next, operation | movement of the roll press machine 1 of a present Example is demonstrated. As shown in FIG. 7, the control panel 12 reads a frame preheating pattern stored in a storage device (not shown) and activates the heater 34 via the signal line 37. In addition, the control panel 12 activates the measurement sensor unit 31 constituting the thickness gauge 3 via the signal line 37 in synchronization with the activation of the heater 34 and starts emitting the laser light 32. Thereafter, when the measurement sensor unit stabilization time Δt (t _A ≦ Δt) has elapsed, the control panel 12 unwinds the unwinder 4, the upstream transport mechanism 6, the preheating roll 10, and the pair of pressure rolls 2 (upper pressure Roll, lower pressure roll), downstream transport mechanism 7 and winder 5 are controlled. The thickness measurement of the sheet 11 is started by the thickness meter 3 after the time t _{B has} elapsed since the continuous compression processing by the pair of pressure rolls 2 is started, and the measured thickness value is transmitted to the control panel 12 via the signal line 37. . Here, the time t _B is a time until the sheet 11 compressed by the pair of pressure rolls 2 reaches the thickness gauge 3.

  When there is a deviation between the thickness measurement value transmitted from the thickness gauge 3 and the target value (target thickness), the control panel 12 is added to the gap between the pair of pressure rolls 2 and the pressure roll 2 that can cancel the deviation. The load to be obtained is obtained and output to the pressurizing mechanism 24 through the signal line 37 as a load adjustment command value. That is, the control panel 12 obtains a load to be applied to the pressure roll 2 by the hydraulic cylinder so that the sheet 11 has the target thickness based on the thickness measurement value of the sheet 11 by the thickness gauge 3, and the pressure mechanism as a load adjustment command value 24 through a signal line 37. In the pressurizing mechanism 24, the hydraulic cylinder moves up and down at a stroke corresponding to the load adjustment command value according to the received load adjustment command value. Thus, feedback control is performed from the start of thickness measurement. Here, the correspondence between the deviation (difference between the measured value and the target value) between the measured thickness value and the target value (target thickness) and the load adjustment command value is stored in a storage device (not shown) in the control panel 12. Has been.

  Note that the frame temperature increase stabilization temperature Ts of the frame 33 that supports the measurement sensor unit 31 is set to be higher than 24 ° C. or 25 ° C. that is the operating atmosphere temperature of the roll press machine 1, for example, about 30 ° C. Note that the frame temperature rise stabilization temperature Ts is obtained using a sample whose thickness is known in advance as described above, and depends on the constituent material of the frame 33 and the operating atmosphere temperature of the roll press machine 1, and is optimal for each. The frame temperature increase stabilization temperature Ts and the frame preheating pattern are obtained in advance.

  According to the present embodiment, in addition to the effects of Embodiment 1, that is, the convection and radiant heat from the roll and / or the convection and radiant heat from the sheet 11 can be prevented from entering the measurement sensor unit 31 and the frame 33, Since the temperature of the frame 33 supporting the paired measurement sensor units 31 can be stabilized in advance, it is possible to prevent the positional deviation of the laser light 32 emitted from the measurement sensor unit 31 due to the thermal deformation of the frame 33, and to further measure the thickness. High accuracy can be achieved.

  In addition, it cannot be overemphasized that this invention can suppress similarly the influence of the heat | fever from the slow cooling roll which may be installed between a pressure roll and a thickness meter.

  The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace the configurations of other embodiments with respect to a part of the configurations of the embodiments.

DESCRIPTION OF SYMBOLS 1 ... Roll press machine 2 ... Pressure roll 3 ... Thickness meter 4 ... Unwinding machine 5 ... Winding machine 6 ... Upstream conveyance mechanism 7 ... Downstream conveyance mechanism 8 ... guide roll 9 ... dancer roll 10 ... preheating roll 11 ... sheet 11a ... coating part 11b ... base material 11c ... non-coating part 12 ... control panel 20 ... Pressure roll shaft 21 ... Housing 22 ... Rolling bearing 23 ... Bearing box 24 ... Pressure mechanism 31 ... Measurement sensor unit 32 ... Laser beam 33 ... Frame 34 ... heaters 35, 39 ... heat shield 36 ... support members 37, 38 ... signal lines

Claims (13)

Thickness gauge that is used in a roll press machine that compresses a sheet coated with an active material on one or both sides of a base made of metal foil with a pair of pressure rolls, and measures the thickness of the sheet after compression processing Because
The thickness gauge includes a measurement sensor unit disposed so as to form a pair above and below the sheet, a frame that supports each measurement sensor unit, and a heat shield that is supported by the frame and has an L -shaped side surface. The thickness gauge is characterized in that a front surface of the thermal shield that opposes the sheet conveyance direction and a bottom surface that opposes the sheet are arranged to cover the measurement sensor units and the frame. The thickness meter according to claim 1,
A thickness gauge, wherein the bottom surface of the thermal shield that faces the front and back surfaces of the sheet has an opening through which laser light emitted from each measurement sensor unit can pass. The thickness meter according to claim 2,
The front surface of the heat shield is fixed to a frame supporting each measurement sensor unit by a resin support member,
The frame has a thickness gauge, characterized in that forming the go-shape suited to the conveying direction of the sheet. In the thickness meter according to claim 3,
The width of the bottom surface of the heat shield is longer than the width of the base material constituting the sheet, and the measurement sensor unit and the frame are positioned along the sheet conveyance direction on the bottom surface of the heat shield. A thickness gauge characterized by extending downstream from the region. The thickness meter according to claim 4,
The heat shield having an L -shaped side surface further includes two side surfaces that extend from both widthwise end portions of the bottom surface and extend to end portions of the front surface, and the two side surfaces support the resin. A thickness meter fixed to the frame by a member. In the thickness meter according to claim 5,
The thickness gauge according to claim 1, wherein the heat shield is made of a resin material, and the frame is made of a metal material. Winding a sheet coated with an active material on one or both sides of a substrate made of metal foil, and unwinding the sheet,
A pair of pressure rolls having a pressure roll shaft that is supported and rotated by a rolling bearing, and that compresses the sheet continuously;
A winder that winds the compressed sheet and generates a winding coil;
A thickness meter that is disposed between the pair of pressure rolls and the winder and measures the thickness of the compressed sheet;
A control panel for controlling a load applied to the pressure roll, based on a thickness measurement value of the sheet by the thickness meter,
The thickness gauge includes a measurement sensor unit disposed so as to form a pair above and below the sheet, a frame that supports each measurement sensor unit, and a heat shield that is supported by the frame and has an L -shaped side surface. A front surface of the thermal shield that opposes the sheet conveyance direction and a bottom surface that opposes the sheet are arranged to cover the measurement sensor units and the frame, and convection generated from the pair of pressure rolls and A roll press machine that shields radiant heat and / or convection and radiant heat generated from the sheet. In the roll press according to claim 7,
The roll press machine, wherein the bottom surface of the thermal shield that faces the front surface and the back surface of the sheet has an opening through which laser light emitted from each measurement sensor unit can pass. The roll press according to claim 8,
The front surface of the heat shield is fixed to a frame supporting each measurement sensor unit by a resin support member,
Wherein the frame, a roll press machine, characterized in that forming the go-shape suited to the conveying direction of the sheet. In the roll press according to claim 9,
The width of the bottom surface of the heat shield is longer than the width of the base material constituting the sheet, and the measurement sensor unit and the frame are positioned along the sheet conveyance direction on the bottom surface of the heat shield. A roll press machine that extends downstream from the region. The roll press according to claim 10,
The thickness gauge has a heater for heating the frame,
Frame preheating shown in relation to a frame temperature rise stabilization temperature at which the temperature in the frame stabilizes after the temperature rises and a time from when the heater is started until the temperature in the frame reaches the temperature rise stabilization temperature. The pattern is stored in advance in the storage device of the control panel,
The control panel reads the frame preheating pattern from the storage device, activates the heater, and preheats the frame. The roll press according to claim 11,
The roll press machine, wherein the control panel controls to start emitting laser light from the paired measurement sensor units in synchronization with the activation of the heater based on the frame preheating pattern. The roll press according to claim 12,
The roll press machine, wherein the control panel starts the pair of pressure rolls after a predetermined time has elapsed from the start of starting the heater and the start of emitting the laser beam, and starts continuous compression processing of the sheet.

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