WO2014129214A1

WO2014129214A1 - Simulation device for drying coating and device for drying coating

Info

Publication number: WO2014129214A1
Application number: PCT/JP2014/050059
Authority: WO
Inventors: 耕志郎山川; 恵子須田; 藤田　和彦; 洋平西松; 敦渡邉; 一茂中島
Original assignee: 東レエンジニアリング株式会社
Priority date: 2013-02-25
Filing date: 2014-01-07
Publication date: 2014-08-28
Also published as: JP6080297B2; JP2014161783A

Abstract

Provided are a simulation device for drying a coating and a device for drying a coating, which are able to substantially assess the dryness of a coating film in real time, and able to always maintain an optimum drying progression state over all regions of the drying device without calculating optimum operating conditions by preliminary tests, etc. Specifically provided are a simulation device for drying a coating and a device for drying a coating, said simulation device including: a structural information data input means that inputs structural information data for the drying device; a material property data input means that inputs material property data for the coating film and a base material; an operating condition data acquisition means that acquires operating condition data for the drying device; a sensor output data acquisition means that acquires output data for a plurality of sensors that are arranged inside the drying device and detect the state inside the drying device; and a drying simulation means that uses the structural information data, the material property data, the operating information data, and the sensor output data to predict, by numerical analysis, the ratio of the solvent remaining in the coating film, the solvent concentration distribution, and the adhesive concentration distribution.

Description

Coating drying simulation device and coating drying device

The present invention relates to a coating / drying apparatus used when manufacturing an electrode plate having a base material sheet for forming a current collector and an active material layer thereon, and is applied to the base material using numerical simulation. The present invention relates to a coating / drying simulation apparatus and a coating / drying apparatus that can dry a processed coating film in a desired state of progress.

Lithium ion batteries have been widely used for mobile applications such as mobile phones and personal computers because they can be made smaller and lighter than conventional alkaline storage batteries. In recent years, the demand for lithium-ion batteries for hybrid vehicles and electric vehicles, which have become widespread due to soaring fuel and carbon dioxide emission regulations, has increased rapidly.

FIG. 2 shows a schematic diagram of the basic structure of the electrode plate constituting the positive or negative electrode of the lithium ion battery. In FIG. 2, reference numeral 1 denotes an electrode plate forming material. The electrode plate forming material 1 is a base for forming a current collector made of aluminum foil, copper foil or the like having flexibility and relatively unstable dimensions. It consists of a material sheet 2 and a coating film 3 for forming an active material layer coated on one side of the base material sheet 2. The coating film 3 contains at least a granular active material 4, a granular binder 5 having a smaller size than that, and a solvent 6 that keeps them in a slurry state at the time of coating. Most of the material is evaporated and the active material 4 is fixed to the base material sheet 2 by fixing the active materials 4 to each other by the binder 5 existing around the active material 4. The electrode plate forming material 1 is manufactured. The sheet-like electrode plate forming material 1 is cut according to the dimensions of the electrode plate that is actually used, and is used for manufacturing lithium ion batteries, fuel cells, and the like.

FIG. 3 shows an example of the configuration of a manufacturing apparatus for forming the electrode plate. In the electrode plate manufacturing apparatus 11 shown in FIG. 3, the base sheet 2 is unwound by a rewinding machine 12 from the roll-up and is applied to the surface of the base sheet 2 by the coater 13 in FIG. 2. The coating film 3 as shown is applied through the application nozzle 14. The base material sheet 2 coated with the coating film 3 is sent to a hot air oven type drying device 15, and the coating film 3 is heated by hot air at a predetermined temperature blown from the upper and lower air blowing

nozzles

16 and 17 in the drying device 15. Drying is performed. Although the coating film 3 applied intermittently in the base material sheet traveling direction is illustrated in FIG. 3, it can be applied as a continuous coating film. The electrode plate forming material 1 after the drying of the coating film 3 by the drying device 15 is measured by a winder after measuring the thickness of the coating film after drying, if necessary (not shown). When coating and drying the coating film 3 one side at a time, the wound roll is mounted on the rewinding machine 12 again and set so that the upper and lower surfaces of the substrate sheet 2 to be rewound are reversed. The same process may be repeated.

In the drying of this coating film, it is known that generally desirable drying progress characteristics exist (for example, Patent Document 1). If the actual drying progress characteristics deviate significantly from the desired drying progress characteristics, the peel strength of the dried coating film from the base material will be reduced, or the binder will adhere to the outer surface of the coating film after drying. May cause a problem that it becomes difficult to obtain target electrode characteristics, and thus target battery characteristics.

In Patent Document 1, the drying process is divided into an initial drying stage, a middle drying stage, and a late drying stage, and the remaining amount of solvent in the coating film is set to an appropriate range for each of them. The wind speed is set to an appropriate range. FIG. 4 schematically shows the relationship between the drying time and the coating film surface temperature. In the initial stage of drying, the temperature rises relatively rapidly, in the middle drying period, the temperature range is almost constant or rises slowly, and in the late drying period, the temperature rises relatively quickly again, reaching the predetermined maximum temperature. It becomes.
In order to avoid the decrease in the peel strength from the base material of the coating film after drying as described above and the precipitation of the binder on the outer surface of the coating film in the coating film after drying, It is known that it is necessary to give a substantially constant temperature or a slowly rising temperature region in the middle drying period shown in FIG.

The method described in Patent Document 1 is basically a method in which each target range of the remaining amount of solvent in the initial stage of drying, the middle stage of drying, and the latter stage of drying is determined in advance, and each operating condition is set to fall within each range. This is a method that is limited to setting operating conditions. Therefore, in order to determine the target range of desirable operating conditions, it is necessary to find out the range of desirable operating conditions in advance by testing or the like. Also, if the desired operating condition range does not vary at all, once it is actually found by a test or the like, the operating condition may be set every time based on it. However, in reality, the range of desirable operating conditions often varies depending on the season, the type of production, and the like. Therefore, in such a case, a desired drying state cannot be obtained even though operating conditions that are considered to be optimal are set for each zone of the drying apparatus. Actually, the drying state of the coating film is visually determined from the viewing window of each zone of the drying device (in reality, the color of the surface of the coating film is visually determined), and the desired drying state is obtained. If it is determined, the operation is continued under the set conditions as they are, and if it is determined that they are out of the desired dry state, the set conditions are changed based on the experience of the operator to obtain the desired dry state. The fact is that we are driving with trial and error. For this reason, the quality of the manufactured product becomes unstable and fluctuates, and if the timing for changing the conditions is lost, a large amount of loss may occur. Further, the method described in Patent Document 1 is based on limited test results, and the operating condition setting method proposed in Patent Document 1 has a limitation in shortening the drying time, and production. It is difficult to improve the sex dramatically.

With respect to fluctuations in the desirable operating condition range, Patent Document 2 discloses that the actual state of the coating film is obtained by installing a plurality of surface state detection means that can detect the surface state of the coating film in a non-contact manner in the traveling direction of the base sheet. A method has been proposed in which the drying state of the drying apparatus can be grasped in real time, and the operation condition is set or controlled based on the drying state so that the drying state can be constantly maintained throughout the entire drying apparatus. However, also in this method, it is necessary to find out in advance a desired desired drying progress characteristic by a test or the like. In particular, in order to significantly reduce the drying time, it is necessary to perform a huge number of tests with each operating condition as a parameter, which increases the test period and cost. In addition, although it is possible to grasp the drying progress state by the surface state detection means, it is not possible to grasp the state of segregation of the binder inside the coating film, particularly in the vicinity of the base sheet, and therefore the operating condition range is particularly varied. If it is large, the peel strength from the base material of the coated film after drying may not be noticed, and a large amount of loss may occur.

Japanese Patent No. 4571842 JP 2012-209074 A

Therefore, in view of the actual situation as described above, the object of the present invention is to make it possible to grasp the dry state of the coating film substantially in real time, and to constantly optimize the entire area of the drying apparatus without obtaining the optimum operating condition by a test or the like in advance. Another object of the present invention is to provide a coating / drying simulation apparatus and a coating / drying apparatus that can maintain a proper drying progress state.

In order to solve the above problems, the present invention adopts the following configuration. That is, according to the present invention, it is a coating drying simulation apparatus for proceeding with drying of a coating film containing at least a solid content, a binder, and a solvent, and the structure information data input for inputting the structure information data of the drying apparatus Means, material physical property data input means for inputting material physical property data of the coating film and substrate, operating condition data acquiring means for acquiring operating condition data of the drying device, and a plurality of drying units installed in the drying device Sensor output data acquisition means for acquiring output data of a sensor for detecting a state in the apparatus, and the residual solvent ratio in the coating film using the structure information data, the material property data, the operation information data, and the sensor output data Or a drying simulation means for predicting the solvent concentration distribution or the binder concentration distribution by numerical analysis. Configuration device is provided.

Further, according to a preferred embodiment of the present invention, the solvent concentration gradient calculated from the solvent concentration distribution, the binder concentration gradient calculated from the binder concentration distribution, or both are set to a predetermined value or less. The operating condition for minimizing the drying time of the coating film is obtained by using an optimization method under the constraint of the coating drying simulation apparatus according to claim 1.

Further, according to a preferred embodiment of the present invention, the drying apparatus is provided with a plurality of operating condition control means in the drying apparatus capable of individually controlling the operating conditions for advancing the drying of the coating film. Coating that is configured to control the operating conditions for drying the coating film with reference to the difference between the operating conditions for minimizing the drying time of the coating film obtained in Item 2 and the current operating conditions A drying device is provided.

Thus, according to the coating drying simulation apparatus and the coating drying apparatus according to the present invention, the drying state of the coating film can be grasped substantially in real time, and the drying apparatus can be obtained without obtaining the optimum operating condition by a test or the like in advance. It is possible to always maintain the optimum drying state over the entire area. As a result, a product of desirable quality can be stably produced with high productivity without causing product loss.

It is a schematic block diagram of the coating drying apparatus which concerns on this invention. It is a schematic diagram of the basic structure of the electrode plate of a lithium ion battery. It is a schematic block diagram of the manufacturing apparatus of the electrode plate of the conventional lithium ion battery. It is a characteristic view which shows the relationship between the surface temperature of the coating film in a drying apparatus, and drying time. It is a schematic block diagram of the coating drying simulation apparatus which concerns on this invention. It is a flowchart which shows the procedure of the implementation at the time of calculating the residual solvent rate in a coating film, solvent concentration distribution, or binder concentration distribution using the coating drying simulation apparatus which concerns on this invention. It is a flowchart which shows the implementation procedure at the time of calculating | requiring the operating condition which minimizes the drying time of a coating film using the coating drying simulation apparatus which concerns on this invention.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the coating and drying apparatus of the present invention. In the electrode plate manufacturing apparatus 11 shown in FIG. 1, the base material sheet 2 is rewound by a rewinding machine 12 from what is wound up in a roll shape, and is applied to the surface of the base material sheet 2 by a coater 13 in FIG. 2. The coating film 3 as shown is applied through the application nozzle 14. The base material sheet 2 coated with the coating film 3 is sent to a hot air oven type drying device 15, and the coating film 3 is heated by hot air at a predetermined temperature blown from the upper and lower

air blowing nozzles

16 and 17 in the drying device 15. Drying is performed. Although the coating film 3 applied intermittently in the base sheet traveling direction is illustrated in FIG. 1, it can be applied as a continuous coating film. The electrode plate forming material 1 after the drying of the coating film 3 by the drying device 15 is measured by a winder after measuring the thickness of the coating film after drying, if necessary (not shown). When coating and drying the coating film 3 one side at a time, the wound roll is mounted on the rewinding machine 12 again and set so that the upper and lower surfaces of the substrate sheet 2 to be rewound are reversed. Thus, the same processing as described above may be repeated.

In the present invention, the drying device 15 is supplied with the coating liquid flow rate of the coating nozzle 14 of the coater, the conveying speed of the base sheet 2, the wind speed of hot air blown from the upper and lower

air blowing nozzles

16, 17, the set temperature, An operating condition data acquisition means 20 for acquiring a set temperature, and a sensor 21 for detecting the surface temperature of the coating film 3, the film thickness, the temperature of each part in the drying device, and the gas concentration in the drying device are provided.

In the schematic configuration of the drying device 15 shown in FIG. 1, the drying device 15 is divided into an initial drying zone 22, a middle drying zone 23, and a late drying zone 24 from the entrance side. Each of the zones for the initial stage of drying, the middle stage of drying, and the late stage of drying may be further divided into a plurality of small zones. In FIG. 1, a sensor 21 for detecting the state in the drying apparatus is arranged at the end side of each zone in the initial stage of drying, the middle stage of drying, and the latter stage of drying, so that the state in the drying apparatus can be grasped. The sensor 21 for detecting the state in the drying apparatus is not limited to the arrangement in FIG. 1 in order to obtain more detailed information in the drying apparatus, and more sensors 21 are arranged in the traveling direction and the width direction of the base sheet 2. It is desirable to do.

The data acquired by the operating condition data acquisition means 20 and the sensor 21 that detects the state in the drying apparatus are sent to the coating drying simulation apparatus 50. In the coating / drying simulation apparatus 50, each time of the coating film is obtained by numerical simulation from the obtained operating condition data and sensor output data, the material property data of the coating film and the structure information data of the drying apparatus previously input by the operator. Alternatively, the residual solvent ratio or solvent concentration distribution or binder concentration distribution in the coating film at each position is predicted. By this method, the drying progress state of the coating film can be grasped substantially in real time including the state inside the coating film. In addition, the solvent concentration gradient calculated from the solvent concentration distribution, the binder concentration gradient calculated from the binder concentration distribution, or both of them, and the peel strength from the substrate of the coated film after drying, etc. If the relationship is obtained in advance by a simple off-line test or the like, the peel strength from the substrate of the coated film after drying can be grasped substantially in real time.

Next, the calculated residual solvent ratio, solvent concentration distribution or binder concentration distribution in the predicted coating film is used as an initial value, and is calculated from the solvent concentration gradient or binder concentration distribution calculated from the solvent concentration distribution. The operating condition that minimizes the drying time of the coating film is automatically determined by using an optimization method under the constraint that the binder concentration gradient or both of them are not more than a predetermined value. The relationship between the solvent concentration gradient calculated from the solvent concentration distribution, the binder concentration gradient calculated from the binder concentration distribution, or both, and the peel strength of the coated film after drying, etc. If it is determined in advance by a simple offline test, etc., the peel strength from the substrate of the coated film after drying can be grasped substantially in real time, and the range of desirable operating conditions must be determined in advance. Absent. In addition, since many parameters included in the operating condition data can be automatically optimized using the optimization method, the drying time can be greatly shortened, and the productivity can be greatly improved.

The optimum operating condition obtained by the coating / drying simulation apparatus and the operating condition data acquired from the operating condition data acquiring means 20 are sent to the operating condition control means 25, and the operation is performed with reference to the difference between the optimum operating condition and the operating condition data. By controlling the conditions individually, it is possible to always maintain the optimal drying progress state over the entire area of the drying apparatus. As a result, a product of desirable quality can be stably produced with high productivity without causing product loss.

FIG. 5 shows a schematic diagram of the configuration of the coating and drying simulation apparatus in the present embodiment. 55 is a computer such as a computer or workstation, 52 is a keyboard, 53 is a mouse, 51 is a display, and 54 is an auxiliary storage device. The auxiliary storage device 54 includes a hard disk device, a tape, an FD (flexible disk), an MO (magneto-optical disk), a PD (phase change optical disk), a CD (compact disk), a DVD (digital versatile disk), and the like. Removable media such as disk memory, USB (Universal Serial Bus) memory, and memory card can also be used.

The auxiliary storage device 54 includes a program 71 for analyzing the temperature and concentration distribution of the coating film and the base sheet, and the structure information of the drying device such as the width and interval of the air blowing nozzle and the height from the base sheet. Data 72, material physical property data 73 of the material constituting the coating film, such as active material density, specific heat, thermal conductivity, substrate sheet thickness, density, thermal conductivity, specific heat, solvent molecular weight, heat of evaporation, specific gravity, etc. , Substrate sheet conveying speed, air blowing nozzle setting air flow, operating temperature data 74 such as setting temperature, temperature in each part of the drying apparatus, sensor output data 75 such as gas concentration, residual solvent ratio in the coating film, solvent concentration Analysis result data 76 such as distribution and binder concentration distribution is stored.

A computer 55 such as a computer or a workstation includes a structure information data input means 61 for inputting structure information data of a drying device such as the width and interval of the air blowing nozzle, the height from the base sheet, and the density and specific heat of the active material. Material physical property data input means 62 for inputting material physical property data of a coating film such as thermal conductivity, substrate sheet thickness, density, thermal conductivity, specific heat, solvent molecular weight, heat of evaporation, specific gravity, etc., and substrate sheet Operating condition data acquisition means 63 for acquiring operating condition data from the coating and drying device such as the conveying speed, air blowing nozzle set air volume, and setting temperature, and sensor output data such as the temperature and gas concentration of each part in the drying device Sensor output data acquisition means 64, structure information data, material property data, operating condition data, sensor output data, unsteady heat conduction equation, unsteady diffusion method Drying simulation means 65 for calculating the temperature distribution of the coating film, the residual solvent ratio in the coating film, the solvent concentration distribution, and the binder concentration distribution according to the equation, the structure information data 72, the material property data 73, the operation in the auxiliary storage device 54 Data writing means 66 for writing condition data 74, sensor output data 75, analysis result data 76, and the like; program 71, structure information data 72, material property data 73, operating condition data 74, sensor output data 75 from auxiliary storage device 54; The display 51 displays analysis results such as the temperature distribution of the coating film, the residual solvent ratio in the coating film, the solvent concentration distribution, and the binder concentration distribution calculated by the data reading means 67 for reading the analysis result data 76 and the like and the drying simulation means 65. The analysis result output means 68 for outputting to the solvent concentration gradient, the solvent concentration gradient calculated from the solvent concentration distribution, Operation such as the conveyance speed of the base sheet, the set air volume of the air blowing nozzle, the set temperature, etc. under the constraint condition that the binder concentration gradient calculated from the binder concentration distribution or both of them are not more than a predetermined value The operation condition optimizing means 69 solves an optimization problem for minimizing the drying time using the conditions as design variables.

Each of these means is implemented as a module such as a subroutine of a program stored in a storage means such as a main storage device of the computer 55. Similarly, data handled by these means is volatile or nonvolatile in the storage means. Remembered.

FIG. 6 is a flowchart showing a procedure for carrying out the calculation of the residual solvent ratio, solvent concentration distribution, or binder concentration distribution in the coating film by the coating / drying simulation apparatus according to this embodiment.

First, the structure information data of the drying device such as the width, interval, and height from the base sheet, and the density of the active material, specific heat, thermal conductivity, base sheet thickness, density, thermal conductivity Material physical property data of the coating film such as rate, specific heat, solvent molecular weight, heat of evaporation, specific gravity, etc. is input in advance (ST001, ST002). After that, with the coating and drying device operating constantly, operating condition data such as the conveyance speed of the base sheet, the set air volume of the air blowing nozzle, the set temperature, the temperature of each part in the drying device, the gas concentration, etc. Sensor output data is acquired from the coating and drying apparatus (ST003, ST004), and the initial conditions of the simulation are set using these data (ST005). Next, the initial condition is stored in a storage means such as a main storage device of the computer (ST006). Next, the temperature distribution after a predetermined calculation step Δt seconds (time t1) is calculated by unsteady heat conduction analysis (ST009). Then, using this temperature distribution, the solvent concentration distribution, binder concentration distribution, coating film thickness, and residual solvent ratio at the same time t1 are calculated by unsteady diffusion analysis (ST010). Analysis results such as the calculated temperature distribution, solvent concentration distribution, and binder concentration distribution are stored in a storage unit such as a main storage device of the computer as an analysis result at time t1 (ST006). Subsequently, the analysis result at time t1 is used as an initial condition (ST008), and the temperature distribution after Δt seconds (time t2 = t1 + Δt) is calculated by unsteady heat conduction analysis (ST009). The solvent concentration distribution, binder concentration distribution, coating film thickness, and residual solvent ratio are calculated by diffusion analysis (ST010). Such calculation is repeated, and the calculation is terminated when the predetermined time tn is reached.

The time until the residual solvent ratio calculated by the above-described procedure falls below a predetermined value is the drying time. Further, from the binder concentration distribution calculated by the above procedure, for example, the binder concentration gradient in the vicinity of the boundary between the base sheet and the coating film can be calculated. Since the concentration gradient of the binder near the boundary is considered to be correlated with the peel strength of the coating film from the base sheet, an offline test is performed on the relationship between the binder concentration gradient near the boundary and the peel strength. If it is obtained in advance by, for example, it is possible to estimate the peel strength from the binder concentration gradient.

Generally, if the calculation step Δt is too large, the calculation accuracy deteriorates, and if Δt is too small, the calculation time increases. Compare the surface temperature profile measured by a radiation thermometer with the surface temperature profile calculated by the simulation for the coating film that is the object of numerical simulation, or the coating film whose drying time is considered to be equivalent to that of the coating film. It is desirable to know in advance the range.

From the viewpoint of calculation time, the simulation is practically performed with a one-dimensional model in which a plurality of calculation points are provided in the film thickness direction of the base sheet and the coating film. In addition, a two-dimensional model in which a plurality of calculation points are provided in the film thickness direction, and a three-dimensional model in which calculation points are also provided in the traveling direction of the base sheet can be used.

By the method described above, the progress of drying of the coating film including the state inside the coating film can be grasped substantially in real time. In addition, the solvent concentration gradient calculated from the solvent concentration distribution, the binder concentration gradient calculated from the binder concentration distribution, or both of them, and the peel strength from the substrate of the coated film after drying, etc. If the relationship is obtained in advance by a simple off-line test or the like, the peel strength from the substrate of the coated film after drying can be grasped substantially in real time. *

FIG. 7 shows a specific example of the solvent concentration gradient calculated from the solvent concentration distribution, the binder concentration gradient calculated from the binder concentration distribution, or both using the coating / drying simulation apparatus according to the present embodiment. It is a flowchart which shows the procedure of the implementation at the time of calculating | requiring automatically the operating condition which minimizes the drying time of a coating film using the optimization method under restrictions set to below a value.

While the coating and drying device is operating steadily, operating condition data such as the conveyance speed of the base sheet, the set air volume of the air blowing nozzle, and the set temperature are acquired from the coating and drying device as the initial operating conditions ( (ST101), the data is stored in a computer storage medium (ST102). Next, according to the flowchart of FIG. 6, the time change of the residual solvent ratio is calculated, and the drying time is predicted (ST106). Next, similarly, the solvent concentration gradient and the binder concentration gradient are calculated according to the flowchart of FIG. 6 (ST106), and the drying time, the solvent concentration gradient and the binder concentration gradient are stored in the storage medium of the computer (ST102). ). Subsequently, part of the operating conditions is changed (ST104), and the calculation of the drying time, the solvent concentration gradient, and the binder concentration gradient (ST105, ST106) is repeated. The change of the operating conditions (ST104) and the determination of the end of the calculation (ST103) are automatically performed using an optimization method such as a genetic algorithm, and the solvent concentration gradient calculated from the solvent concentration distribution or the binding is performed. Under the constraint that the binder concentration gradient calculated from the agent concentration distribution or both of them are equal to or less than a predetermined value, an optimum operating condition that minimizes the drying time of the coating film is calculated.

According to the method described above, since the desired operating condition is automatically obtained by the optimization method, it is not necessary to obtain the desired operating condition range in advance. In addition, since many parameters included in the operating condition data can be automatically optimized using the optimization method, the drying time can be greatly shortened, and the productivity can be dramatically improved.

The above-mentioned optimum operating condition and the operating condition data acquired from the operating condition data acquiring means are sent to the operating condition control means, and the operating conditions are individually controlled with reference to the difference between the optimum operating condition and the operating condition data (ST107). As a result, it is possible to always maintain the optimum drying state over the entire area of the drying apparatus. As a result, a product of desirable quality can be stably produced with high productivity without causing product loss.

In this embodiment, a single-side coating method using a support / conveyance roller is described, but the present invention can also be applied to a double-side coating method using air floating conveyance.

The present invention is applicable not only to the roll-to-roll method but also to a single-wafer type or batch type drying apparatus.

DESCRIPTION OF SYMBOLS 1 Electrode plate forming material 2 Base material sheet 3 Coating film 4 Active material 5 Binder 6 Solvent 11 Electrode plate manufacturing apparatus 12 Rewinder 13 Coater 14 Coating nozzle 15 Drying apparatus 16 Air blowing nozzle 17 Air blowing nozzle 20 Operating condition data Acquiring means 21 Sensor for detecting the state in the drying apparatus 22 Initial drying zone 23 Intermediate drying zone 24 Late drying zone 25 Operating condition control means 31 Supporting / transporting roller 50 Coating drying simulation means 51 Display 52 Keyboard 53 Mouse 54 Auxiliary storage device 55 Computer 61 Structure information data input means 62 Material property data input means 63 Operating condition data acquisition means 64 Sensor output data acquisition means 65 Drying simulation means 66 Data writing means 67 Data reading Stage 68 the analysis result output unit 69 operating condition optimizing means 71 program 72 structure information data 73 material property data 74 operating condition data 75 sensor output data 76 the analysis result data

Claims

A coating drying simulation apparatus for proceeding with drying of a coating film containing at least a solid content, a binder and a solvent,
Structure information data input means for inputting the structure information data of the drying device;
Material physical property data input means for inputting material physical property data of the coating film and the substrate,
Operating condition data acquiring means for acquiring operating condition data of the drying apparatus, and sensor output data acquiring means for acquiring output data of a sensor for detecting a state in the drying apparatus installed in the drying apparatus.
Drying simulation means for predicting the residual solvent ratio or solvent concentration distribution or binder concentration distribution in the coating film by numerical analysis using the structure information data, the material property data, the operation information data, and the sensor output data;
A coating / drying simulation apparatus characterized by comprising:
Under the constraint that the solvent concentration gradient calculated from the solvent concentration distribution, the binder concentration gradient calculated from the binder concentration distribution, or both of them are not more than a predetermined value, the drying time of the coating film is The coating / drying simulation apparatus according to claim 1, wherein an operation condition to be minimized is obtained using an optimization method.
The drying apparatus is provided with a plurality of operating condition control means in the drying apparatus capable of individually controlling the operating conditions for advancing the drying of the coating film,
A coating configured to control the operating conditions for drying the coating film with reference to the difference between the operating conditions for minimizing the drying time of the coating film obtained in claim 2 and the current operating conditions. Engineering drying equipment.