CN110114150B - Coating and drying device and coating and drying method - Google Patents

Coating and drying device and coating and drying method Download PDF

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Publication number
CN110114150B
CN110114150B CN201780076483.5A CN201780076483A CN110114150B CN 110114150 B CN110114150 B CN 110114150B CN 201780076483 A CN201780076483 A CN 201780076483A CN 110114150 B CN110114150 B CN 110114150B
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China
Prior art keywords
coating
concentration
steel strip
unit
organic solvent
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CN201780076483.5A
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CN110114150A (en
Inventor
城野洋
马郡义弘
平石敏郎
平尾荣二
进藤秀昭
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Chugai Ro Co Ltd
JFE Galvanizing and Coating Co Ltd
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Chugai Ro Co Ltd
JFE Galvanizing and Coating Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects

Abstract

A coating and drying apparatus for coating and drying a steel strip while continuously conveying the steel strip includes a conveying unit, a coating unit, a dryer, an exhaust unit, a concentration measuring unit, and a control unit for calculating an arrival prediction concentration based on the solubility of an organic solvent measured by the concentration measuring unit, and controlling the coating unit to stop coating while continuing the conveyance by the conveying unit when the arrival prediction concentration is equal to or higher than a predetermined threshold concentration.

Description

Coating and drying device and coating and drying method
Technical Field
The present disclosure relates to a coating and drying apparatus and a coating and drying method for performing coating and drying while continuously conveying a steel strip.
Background
Conventionally, as an apparatus for coating a steel strip (metal strip) with a roll coater, a coating and drying apparatus and a method thereof have been proposed, in which a coating material applied to the steel strip is dried and sintered in a dryer while the steel strip is conveyed (for example, see patent documents 1 to 3).
In the coating and drying apparatuses of patent documents 1 to 3, a certain amount of gas is constantly discharged from the interior of the dryer by the blower, and the temperature of the steel strip entering the dryer rises as it enters the interior, so that the applied coating is dried. The coating is completely dried in a dryer and enters a sintering process.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. Hei 4-193371
Patent document 2: japanese patent laid-open No. 2005-262132
Patent document 3: japanese patent laid-open No. 8-38855
Disclosure of Invention
Technical problem to be solved by the invention
However, in the coating and drying apparatuses disclosed in patent documents 1 and 2, the coating material applied to the steel strip usually contains a flammable organic solvent, and the evaporated organic solvent diffuses into the ambient gas in the dryer. In order to prevent the organic solvent from being ignited by heat in the dryer, it is preferable to maintain the concentration of the organic solvent in the ambient air in the dryer at a predetermined concentration or less, and it is desired to develop a technique capable of improving safety by realizing such control with high accuracy and realizing energy saving by optimizing the amount of exhaust gas.
However, in actual operation, the application amount may be erroneously doubled or excessively increased to a larger extent from the operation start time due to human error in operating the coating and drying device, failure of the control device for controlling the application amount, and the like. In this case, if the atmosphere gas having a high organic solvent concentration is not completely discharged, there is a possibility that an explosion accident may occur.
On the other hand, although there is a technique of increasing the amount of exhaust gas based on the organic solvent concentration in the dryer as in patent document 3, a large blower is required to exhaust the ambient gas having an excessive organic solvent concentration as soon as possible, which increases the manufacturing cost and requires a large installation space.
The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to improve safety and to save energy during operation in a coating and drying apparatus and a coating and drying method.
Technical scheme for solving technical problem
A coating and drying apparatus according to an aspect of the present disclosure is a coating and drying apparatus that performs coating and drying while continuously conveying a steel strip, and includes: a conveying unit that conveys the steel strip; a coating unit that applies a coating material containing an organic solvent to the conveyed steel strip at a coating position; a dryer that forms a heating space for drying the steel strip at a position downstream of the coating position; an exhaust unit configured to exhaust the heating space; a concentration measuring portion that measures an organic solvent concentration of the organic solvent in the heating space; and a control unit that controls an operation of the coating and drying device, wherein the control unit calculates an arrival prediction concentration based on the organic solvent concentration measured by the concentration measurement unit, and controls the coating unit to stop coating while continuing the conveyance by the conveyance unit when the arrival prediction concentration is equal to or higher than a predetermined threshold concentration.
According to the above configuration, it is possible to realize control for preventing the organic solvent concentration in the heating space from becoming excessively high, and to prevent the organic solvent from being ignited by the heat of the heating space with high accuracy, thereby improving safety.
In the coating and drying apparatus, the control unit may stop the coating by the coating unit and control the conveying speed of the conveying unit to be lower when the estimated arrival concentration is equal to or higher than the threshold concentration. This can further suppress an increase in the concentration of the organic solvent, and can further improve safety.
The coating and drying apparatus may further include a removal unit that removes the coating material applied to the steel strip by the coating unit at a position upstream of the heating space, and the control unit may stop the coating by the coating unit and perform control so as to remove the coating material by the removal unit when the estimated arrival concentration is equal to or higher than the threshold concentration. This can further suppress an increase in the concentration of the organic solvent, and can further improve safety.
In the coating and drying apparatus, the control unit may stop the coating in the coating unit while maintaining the exhaust gas amount in the exhaust unit at the same amount when the estimated arrival concentration is equal to or higher than the threshold concentration. This enables the operation to be performed by simple control and mechanism.
A coating and drying method according to an aspect of the present disclosure is a coating and drying method for performing a coating and drying process while continuously conveying a steel strip, including: a step of conveying the steel strip; a coating step of applying a coating material containing an organic solvent to the carried steel strip at a coating position; a drying step of drying the steel strip through a heating space at a position downstream of the coating position; an exhaust step of exhausting the heating space; a measuring step of measuring an organic solvent concentration of the organic solvent in the heating space; an operation step of operating an arrival prediction concentration based on the measured organic solvent concentration; and a coating stop step of stopping coating while continuing the conveyance of the steel strip when the arrival prediction concentration is equal to or higher than a predetermined threshold concentration.
According to the above configuration, it is possible to realize control for preventing the organic solvent concentration in the heating space from becoming excessively high, and it is possible to reliably prevent the organic solvent from being ignited by the heat of the heating space, and to improve safety.
In the coating and drying method, the coating may be stopped and the conveying speed of the steel strip may be reduced in addition to the stopping of the coating when the arrival prediction concentration is equal to or higher than the threshold concentration in the coating stopping step. This can further suppress an increase in the concentration of the organic solvent, and can further improve safety.
In the coating and drying method, when the estimated arrival concentration is equal to or higher than the threshold concentration in the coating stop step, the coating may be stopped, and the coating material applied to the steel strip at the coating position may be removed at a position upstream of the heating space. This can further suppress an increase in the concentration of the organic solvent, and can further improve safety.
In the coating and drying method, in the coating stop step, when the estimated arrival concentration is equal to or higher than the threshold concentration, the coating may be stopped while maintaining the same amount of exhaust gas. This enables the operation to be performed by simple control.
Effects of the invention
According to the present disclosure, safety can be improved.
Drawings
The above aspects and features of the present invention will become apparent from the following description of the preferred embodiments with reference to the accompanying drawings.
Fig. 1 is a diagram showing a schematic configuration of a coating and drying apparatus according to embodiment 1.
Fig. 2A is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 1.
Fig. 2B is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 1.
Fig. 2C is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 1.
Fig. 2D is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 1.
Fig. 3 is a diagram showing an example of a change in the concentration of an organic solvent caused by the operation of the coating and drying apparatus according to embodiment 1.
Fig. 4A is a schematic diagram illustrating another example of the operation state of the coating and drying apparatus according to embodiment 1.
Fig. 4B is a schematic diagram illustrating another example of the operation state of the coating and drying apparatus according to embodiment 1.
Fig. 4C is a schematic diagram illustrating another example of the operation state of the coating and drying apparatus according to embodiment 1.
Fig. 4D is a schematic diagram illustrating another example of the operation state of the coating and drying apparatus according to embodiment 1.
Fig. 5 is a diagram showing another example of the change in the concentration of the organic solvent caused by the operation of the coating and drying apparatus according to embodiment 1.
Fig. 6A is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 2.
Fig. 6B is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 2.
Fig. 6C is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 2.
Fig. 6D is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 2.
Fig. 7 is a diagram showing an example of a change in the concentration of the organic solvent caused by the operation of the coating and drying apparatus according to embodiment 2.
Fig. 8A is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 3.
Fig. 8B is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 3.
Fig. 8C is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 3.
Fig. 8D is a schematic diagram illustrating an example of an operation state of the coating and drying apparatus according to embodiment 3.
Fig. 9 is a diagram showing an example of a change in the concentration of an organic solvent caused by the operation of the coating and drying apparatus according to embodiment 3.
Fig. 10 is a diagram showing an example of the change in the concentration of the organic solvent when the conveyance is stopped in addition to the stop of the application.
Detailed Description
Hereinafter, preferred embodiments of the coating and drying apparatus and the coating and drying method according to the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the specific configurations of the following embodiments, and configurations based on the same technical concept are also included in the present disclosure.
(embodiment mode 1)
Fig. 1 is a diagram showing a schematic configuration of a coating and drying apparatus 2 according to embodiment 1.
The coating and drying apparatus 2 is an apparatus that performs coating, drying, and sintering processes while continuously conveying the steel strip S. As shown in fig. 1, the coating and drying apparatus 2 includes a conveyance unit 4, a coating unit 6, a dryer 8, an exhaust unit 10, a concentration measurement unit 12, and a control unit 14.
The coating and drying apparatus 2 applies a coating material (for example, about 50 μm in thickness) containing an organic solvent to the coating position 7 by the coating unit 6 while continuously conveying the steel strip S by the conveying unit 4. Subsequently, the paint applied to the steel strip S is dried and sintered by heating the steel strip S in a heating space 9 in a dryer 8 located on the downstream side of the application position 7.
In particular, the invention of the present disclosure measures the organic solvent concentration of the ambient gas in the heating space 9 by the concentration measuring unit 12 connected to the heating space 9 in the dryer 8, and calculates the concentration predicted to be reached later, that is, the "reached predicted concentration", based on the measured concentration. When the predicted concentration is equal to or higher than the predetermined threshold concentration, the coating of the coating section 6 is controlled to be stopped while the steel strip S is continuously conveyed by the conveying section 4.
Hereinafter, each component of the coating and drying apparatus 2 will be described.
The conveying section 4 is a mechanism for continuously conveying the steel strip S at a constant speed to the downstream side. The conveying unit 4 shown in fig. 1 is constituted by a plurality of rotating rollers. The steel strip S is unwound from a coil (not shown) in which a metal strip extending thinly in a strip shape in the process of manufacturing a steel sheet is wound into a coil shape, for example, and is supplied to the conveying section 4.
The coating unit 6 is a member for applying paint to the steel strip S conveyed by the conveying unit 4 at a coating position 7. As the paint to be applied to the coating portion 6, a paint containing an organic solvent such as toluene or xylene is used. As shown in fig. 1, the coating position 7 of the coating section 6 is located upstream of the dryer 8.
The coating section 6 shown in fig. 1 is constituted by a roll coater having two rotating rolls. Specifically, the coating section 6 includes a pickup roller 6a and a coating roller 6b as two rotating rollers, and includes a coating material storage section 6c and a moving mechanism 6 d. The pickup roller 6a is a rotating roller that contacts the paint roller 6b so as to push up the paint stored in the paint storage portion 6c and supply or transfer the paint to the paint roller 6 b. The paint roller 6b is a rotating roller that contacts the steel strip S so as to apply the paint supplied from the pickup roller 6a to the surface of the steel strip S. The paint storage portion 6c is a member (e.g., a container) that stores paint. The moving mechanism 6d is a member (e.g., a hydraulic cylinder) that can integrally drive the pickup roller 6a, the paint roller 6b, and the paint reservoir 6 c.
In the above configuration, the coating state in which the steel strip S is coated and the standby state in which the steel strip S is withdrawn from the coating state can be switched with each other under the drive control of the moving mechanism 6 d. The coated state is shown in fig. 1. The amount of paint applied to the steel strip S can be controlled by controlling the pressing force and the number of rotations for pressing the pick-up roller 6a and the paint roller 6b against each other. In embodiment 1, the amount of paint applied to the steel strip S during operation is controlled to be constant.
The dryer 8 is a furnace for heating the steel strip S coated with the paint and drying and sintering the paint on the steel strip S. The drier 8 is formed with a heating space 9 having a length enough to complete the drying and sintering process at the inner side. The entire steel strip S in the heating space 9 is heated by maintaining the heating space 9 in the dryer 8 at a predetermined temperature. Since the steel strip S is conveyed at a constant speed in the heating space 9, the heating of the steel strip S is promoted toward the downstream side of the heating space 9.
As shown in fig. 1, the dryer 8 is provided downstream of the application position 7 of the application section 6 in the conveying direction a of the steel strip S. The coating section 6 and the dryer 8 are arranged at an interval, and a section from the coating position 7 of the coating section 6 to the entrance portion of the heating space 9 of the dryer 8 is an idle running section 16 in which the coated steel strip S is conveyed in a non-heated state.
The exhaust unit 10 is a member for exhausting the heating space 9 in the dryer 8. In the example of fig. 1, the exhaust part 10 includes a duct 10a and a blower 10 b. The duct 10a is a pipe directly connected to the heating space 9, and circulates the air of the heating space 9 to the outside. The blower 10b discharges the air circulating through the duct 10a to the outside.
The concentration measuring portion 12 is a member (for example, a concentration sensor) that measures the organic solvent concentration of the ambient gas in the heating space 9. The concentration measuring unit 12 shown in fig. 1 is connected to a position representing the heating space 9 so as to directly measure the organic solvent concentration of the ambient gas in the heating space 9, and is more preferably provided at a position in the heating space 9 where the organic solvent concentration of the assumed ambient gas is highest.
The control unit 14 controls the operation of the coating and drying apparatus 2. The control unit 14 is constituted by, for example, a microcomputer including a memory and a processing circuit corresponding to a processor such as a CPU. The control unit 14 is electrically connected to at least the conveying unit 4, the coating unit 6, the exhaust unit 10, and the concentration measuring unit 12, and controls the operations of these components.
An operation example of the coating and drying apparatus 2 configured as described above will be described with reference to fig. 2A to 2D.
First, the temperature is raised (temperature raising step). Specifically, the dryer 8 is operated under the control of the controller 14, and the entire heating space 9 in the dryer 8 is heated to a predetermined heating temperature (for example, 300 degrees) and maintained at the heating temperature.
Subsequently, the steel strip S is conveyed (conveying step). Specifically, as shown in fig. 2A, the conveyor 4 is operated under the control of the controller 14, and the steel strip S is continuously conveyed downstream at a constant speed (conveying direction a).
Then, coating is performed (coating step). Specifically, as shown in fig. 2A, the coating unit 6 is operated under the control of the control unit 14, and the paint is applied to the steel strip S during conveyance at the coating position 7. As described above, the amount of paint applied by the application section 6 is kept constant per unit time. Thereby, the paint is applied to the steel strip S in a uniform thickness.
In the example shown in fig. 2A, a state in which the steel strip S coated with paint is about to enter the heating space 9 in the dryer 8 is shown. Since the steel strip S moves in the idle running section 16 between the coating position 7 and the entrance portion of the heating space 9, a time lag occurs from the start of coating by the coating section 6 to the time when the coated portion (shown by a thick line) of the steel strip S enters the heating space 9.
Then, heating is performed (heating step). Specifically, the coated steel strip S is heated in a heating space 9 in the dryer 8 maintained at a predetermined heating temperature.
Fig. 2B shows a state where the steel strip S is continuously conveyed from the state shown in fig. 2A. When the coated steel strip S is heated in the heating space 9, the organic solvent contained in the paint applied to the steel strip S is evaporated. Since the temperature of the steel strip S entering the heating space 9 at normal temperature gradually increases as it advances downstream, the organic solvent contained in the paint on the steel strip S starts to evaporate from the most upstream side of the heating space 9, and the amount of evaporation gradually increases.
In fig. 2B, an evaporation amount 18 indicating the degree of evaporation of the organic solvent in the steel strip S is shown. As shown in fig. 2B, the coated steel strip S starts to be heated and evaporated from the inside of the dryer 8, and the evaporation amount 18 of the organic solvent increases as the steel strip S advances toward the downstream side in the conveying direction a. In fig. 2B, the evaporation amount 18 is indicated by a hatched portion for easy observation. The height of the hatched portion indicates the amount of evaporation at that position, and the area is the total amount of evaporation.
Further, the organic solvent concentration of the ambient gas is measured (measuring step). Specifically, the concentration measuring unit 12 is operated to measure the organic solvent concentration of the ambient gas in the heating space 9. In embodiment 1, the concentration measuring unit 12 continuously measures the concentration of the organic solvent, and transmits the measurement result to the control unit 14 as needed.
Subsequently, the exhaust is performed (exhaust step). Specifically, the exhaust unit 10 is operated under the control of the control unit 14 to exhaust the heating space 9. In embodiment 1, the discharge amount of the blower 10b of the discharge unit 10 is set to be constant per unit time.
Fig. 2C shows a state where the steel strip S is continuously conveyed from the state shown in fig. 2B. As shown by the evaporation amount 20 of the organic solvent in fig. 2C, the evaporation of the organic solvent is completed at the evaporation end point 22. The remaining coating material remaining after the evaporation of the organic solvent is continuously heated in the heating space 9 to be sintered on the surface of the steel strip S.
Fig. 2D shows a state where the steel strip S is continuously conveyed from the state shown in fig. 2C. As shown by the evaporation amount 24 of the organic solvent in fig. 2D, the region from the inlet of the heating space 9 to the evaporation end point 22 is a drying region 23 in which the organic solvent is evaporated and dried. The region from the evaporation end point 22 to the outlet of the heating space 9 is a sintering region 25 where the paint on the steel strip S is heated and sintered.
As described above, since the conveyance speed of the conveyance unit 4, the amount of application by the application unit 6, and the amount of exhaust by the exhaust unit 10 are controlled to be constant, the evaporation amount 24 of the organic solvent in the paint in the dryer 8 is constant, and the state shown in fig. 2D is maintained.
Here, after the steel strip S enters the dryer 8 as shown in fig. 2B, the organic solvent starts to evaporate, and the evaporated organic solvent starts to diffuse in the dryer 8. Thereby, the value of the measurement value of the concentration measurement section 12 changes from 0.
Fig. 3 shows an example of the change in the concentration of the organic solvent in the ambient gas in the heating space 9 in the operation example of fig. 2A to 2D. The examples shown in fig. 2A to 2D and fig. 3 show the case where the application amount of the application section 6 is normally controlled.
In fig. 3, the horizontal axis represents time, and the vertical axis represents the concentration of the organic solvent in the ambient gas in the heating space 9. As shown in fig. 3, the actual average concentration D, which is the actual average concentration of the organic solvent in the ambient gas in the heating space 91The measured concentration D, which is the concentration of the organic solvent measured by the concentration measuring unit 122When the operation of the coating and drying device 2 is started (time t)0) And then begins to increase gradually. As shown in FIG. 3, the concentration D was measured2Specific actual average concentration D1The increase in (c) increases more late. This is because the organic solvent on the steel strip S needs to be moved to the concentration measuring section 12 after evaporation. In addition, the actual average concentration D of embodiment 11The amount of the organic solvent applied to the steel strip S by the coating section 6, the distance (the idle zone 16) from the coating section 6 to the dryer 8, the capacity of the dryer 8, the amount of the exhaust gas discharged from the dryer 8 by the exhaust section 10, the speed of the steel strip S, and the like are calculated from the amount of the organic solvent evaporated in the dryer 8.
Subsequently, the actual average concentration D1And measuring the concentration D2Are all fixed and in a stable state.
In embodiment 1, the control unit 14 measures the concentration D of the organic solvent based on the concentration measured by the concentration measuring unit 122For the arrival prediction concentration D3And (6) performing operation. More specifically, the control unit 14 measures the concentration D of the organic solvent based on the concentration measured by the concentration measuring unit 122At the first change from 0 (time t)1) Value pair of (D) to reach the predicted concentration D3And (6) performing operation. Then the process continues to reach the predicted concentration D3And (4) performing the operation of (1).
The "value at the time of the first change" is not limited to the value at the time of starting the change from zero within the period of one pulse (for example, 100ms) of the measurement cycle of the concentration measurement unit 12. In order to establish the safety measures, the time may be calculated based on past data (for example, 0.5 seconds after the start of the flow of the organic solvent into the dryer 8).
Reach predicted concentration D3An example of the specific expression of (3) is as follows. The following formula is an example, and other than the above, if the concentration D can be measured based on the organic solvent2For the arrival prediction concentration D3Any calculation method may be used to perform the calculation.
Math formula 1
D3＝D2/(1-exp(－(t1－x)/T))
Here, t1X is a variable including a lag time before the organic solvent flows in, and T is a time constant.
In the example shown in FIG. 3, at time t1The estimated arrival concentration D calculated by the control unit 143Does not exceed a predetermined threshold concentration D4. Thus, the predicted concentration D is reached3Does not exceed a prescribed threshold concentration D4In the case of (3), the control unit 14 determines that the state is normal and does not perform any special control. In addition, the threshold concentration D4Is a value smaller than the lower explosive limit concentration of the organic solvent.
Fig. 2A to 2D and fig. 3 show the case where the application amount of the application section 6 is normally controlled, but it is conceivable that the application amount is controlled from the operation start time point (time t) due to a human error when the application drying device 2 is operated, a failure of the control device for controlling the application amount of the application section 6, or the like0) The situation starts to become excessively large.
In this case, the concentration D measured by the organic solvent is performed in the coating and drying apparatus 2 of embodiment 12And (4) controlling. Specifically, the measured concentration D by the concentration measuring unit 122For the arrival prediction concentration D3Performing an operation, and estimating the concentration D when the concentration reaches the estimated concentration3Is a predetermined threshold concentration D4In the above case, the concentration D is calculated so as to be at the actual average concentration D1The operation (coating) of the coating section 6 is stopped before the threshold value is exceeded. In embodiment 1, the conveyance of the steel strip S by the conveyor 4 is continued while the operation of the coating unit 6 is stopped, and the conveyance speed of the conveyor 4 and the amount of exhaust gas of the exhaust unit 10 are maintained at the same speed and the same amount of exhaust gas without changing the speed.
Fig. 4A to 4D and fig. 5 show an example of the above control.
As shown in fig. 4A and 4B, the amount of application by the application section 6 is erroneously excessively increased, and therefore the evaporation amounts 26 and 27 are much larger than the evaporation amounts 18 and 20 shown in fig. 2B and 2C.
As shown in fig. 4A, the organic solvent evaporates at the point of time when the steel strip S enters the heating space 9 in the dryer 8, and therefore, the measurement result of the concentration measuring section 12 starts to change. In embodiment 1, the measured concentration D of the organic solvent measured by the concentration measuring unit 12 is used as the basis2The value at which the initial change from 0 occurred is the value at which the predicted concentration D was reached3And (6) performing operation. Specifically, the estimated arrival concentration D is calculated from the expression shown in equation 13And (6) performing operation.
As shown in fig. 5, at time t1The estimated arrival concentration D calculated by the control unit 143Exceeding a predetermined threshold concentration D4. Reach the predicted concentration D as described above3Exceeding a predetermined threshold concentration D4In the case of (3), the control unit 14 controls to stop the operation of the coating unit 6 while continuing the operation of the conveying unit 4. Specifically, as shown in fig. 4A, the coating of the coating section 6 is stopped by withdrawing the coating section 6 from the coating state to the standby state. The coating on the steel strip S is finished at the coating end point 29, but the conveyance of the steel strip S is continued.
Fig. 4C shows a state in which the conveyance of the steel strip S by the conveyance unit 4 is continued with the coating by the coating unit 6 stopped. As shown in fig. 4C, the organic solvent does not evaporate on the upstream side of the coating end point 29, which is the point where the coating of the coating section 6 is finally performed. At this time, the evaporation amount 28 of the organic solvent in the entire heating space 9 is reduced from the evaporation amount 27 shown in fig. 4B (a state at the moment when the coating end point 29 enters the heating space 9 of the dryer 8). As described above, the increase in the concentration of the organic solvent in the heating space 9 is suppressed.
According to such control as described above, as shown in fig. 5, even at time t1The actual average concentration D can then also be determined1Does not exceed a prescribed threshold concentration D4Thereby eliminating the risk of causing an explosion.
Fig. 4D shows a state where the steel strip S is continuously conveyed from the state shown in fig. 4C. As shown in fig. 4D, the steel strip S after completion of the drying and sintering processes is discharged to the outside of the dryer 8. The steel strip S is completed in an abnormal operation in which the coating amount of the coating portion 6 is erroneously set, and therefore, may be discarded later.
Then, the cause of the abnormal operation is eliminated, and the operation is restarted in a normal state.
As described above, the coating and drying apparatus 2 according to embodiment 1 is a coating and drying apparatus 2 that performs coating and drying processes while continuously conveying the steel strip S. The coating and drying apparatus 2 includes: a conveying unit 4 for conveying the steel strip S by the conveying unit 4; a coating unit 6 for applying a paint containing an organic solvent to the steel strip S at a coating position 7 by the coating unit 6; a dryer 8 for drying the steel strip S in the heating space 9 at a position downstream of the coating position 7 by the dryer 8; an exhaust unit 10, the exhaust unit 10 exhausting the heating space 9 of the dryer 8; a concentration measuring unit 12, the concentration measuring unit 12 measuring the organic solvent concentration of the ambient gas in the heating space 9 of the dryer 8; and a control unit 14, the control unit 14 controlling the operation of the coating and drying device 2. Subsequently, the control unit 14 measures the concentration D of the organic solvent based on the concentration measured by the concentration measuring unit 122For the arrival prediction concentration D3Performing an operation, and estimating the concentration D when the concentration reaches the estimated concentration3Is a prescribed threshold concentration D4In the above case, the control is performed so as to stop the application by the application unit 6 while continuing the conveyance by the conveyance unit 4.
Similarly, the coating and drying method of embodiment 1 is a coating and drying method for performing coating and drying while continuously conveying a steel strip S, and includes: to pairA step of carrying the steel strip S; a coating step of applying a coating material containing an organic solvent to the steel strip S being conveyed at a coating position 7; a drying step of drying the steel strip S through the heating space 9 at a position downstream of the coating position 7; an exhaust step of exhausting the heating space 9; a measurement step of measuring the organic solvent concentration of the ambient gas of the heating space 9; based on the measured concentration D of the organic solvent2For the arrival prediction concentration D3An operation step of performing an operation; and at the arrival of the predicted concentration D3Is a prescribed threshold concentration D4In the above case, the coating is stopped while the conveyance of the steel strip S is continued.
According to the above configuration, the concentration D is predicted by the calculated arrival3Is a prescribed threshold concentration D4In the above case, the calculation of the coating section 6 is stopped, and the subsequent increase in the concentration of the organic solvent in the heating space 9 can be suppressed. By this control, it is possible to realize control for preventing the concentration of the organic solvent in the heating space 9 from becoming excessively high, and to prevent ignition or the like of the organic solvent by the heat of the heating space 9 with high accuracy, thereby improving safety. Further, energy saving during operation can be achieved.
The above method and apparatus can achieve the optimization of the amount of exhaust gas in the exhaust unit 10, and therefore, the sensible heat of exhaust gas can be suppressed to a low level, and as a result, the thermal efficiency can be improved.
Further, according to the coating and drying apparatus 2 of embodiment 1, the control unit 14 starts coating by the coating unit 6 and then measures the concentration D of the organic solvent based on the concentration measured by the concentration measuring unit 122Value at the time of initial change from 0 to reach predicted concentration D3And (6) performing operation. Also, according to the coating and drying method of embodiment 1, in the calculation step, the concentration D is calculated based on the measured concentration of the organic solvent after the start of coating2Value at the time of initial change from 0 to reach predicted concentration D3And (6) performing operation.
According to the above configuration, the concentration D is predicted by the arrival of the target3Using measured concentration D in the calculation2The value at the time of the initial change can be quickly determinedThe application of 6 is stopped. This can quickly suppress an increase in the concentration of the organic solvent in the heating space 9, and can further improve safety.
Further, according to the coating and drying apparatus 2 of embodiment 1, the estimated concentration D is reached3Is a prescribed threshold concentration D4In the above case, the control unit 14 stops the application by the application unit 6 while maintaining the exhaust amount of the exhaust unit 10 at the same amount. Also, according to the coating and drying method of embodiment 1, in the coating stop step, the predicted concentration D is reached3Is a prescribed threshold concentration D4In the above case, the coating is stopped while maintaining the same amount of exhaust gas.
According to the above configuration, the exhaust amount can be increased by a simple mechanism and control as compared with the case where the exhaust amount is increased when the organic solvent concentration in the ambient gas is increased.
(embodiment mode 2)
A coating and drying apparatus 30 according to embodiment 2 of the present disclosure will be described. In embodiment 2, the differences from embodiment 1 will be mainly described. In embodiment 2, the same or equivalent structures as those in embodiment 1 are denoted by the same reference numerals and described. In embodiment 2, description overlapping with embodiment 1 is omitted.
In embodiment 1, the concentration D is predicted to be reached3Is a prescribed threshold concentration D4In the above case, the control of stopping the application by the application unit 6 is performed, but the embodiment 2 differs in that the control of reducing the conveyance speed by the conveyance unit 4 is performed simultaneously with the stop of the application.
Fig. 6A to 6D and fig. 7 show an example of the operation of the coating and drying apparatus 30 according to embodiment 2 and an example of the change in the concentration of the organic solvent, respectively.
As shown in fig. 6A, the coating section 6 is retracted from the coating state to the standby state, and the coating of the coating section 6 is stopped, as in embodiment 1. This is because, as shown in FIG. 7, at time t1Based on the measured concentration D of the concentration measuring part 122Calculated predicted concentration D of arrival3Exceeding a defined thresholdValue concentration D4. In embodiment 2, the control unit 14 also performs control to reduce the conveying speed of the conveying unit 4 (for example, to a speed of 40 to 80%). Specifically, as shown in fig. 6A, the rotation speed of the motor 31 that drives the conveying unit 4 is reduced.
Fig. 6B shows a state where the steel strip S is continuously conveyed from the state of fig. 6A. In the state shown in fig. 6B, the evaporation of the organic solvent is completed at the evaporation end point 32 on the downstream side of the inlet of the heating space 9. When compared with the evaporation end point 22 of embodiment 1 shown in fig. 4B, the evaporation end point 32 of embodiment 2 shown in fig. 6B is located on the upstream side. This is because the steel strip S can be heated for the same time even with a small conveying distance by reducing the conveying speed of the conveying section 4.
As described above, by reducing the conveying speed of the conveying section 4 in addition to stopping the coating by the coating section 6, the amount of the coating material entering the heating space 9 per unit time is reduced. Thus, the evaporation amounts 34 and 36 (fig. 6C) of the organic solvent in the heating space 9 are reduced as compared with the case where the conveying speed of the conveying unit 4 is maintained at the same speed without reducing the conveying speed, and the increase in the concentration of the organic solvent can be further suppressed. As shown in fig. 7, the stop of the application in the application section 6 can be further suppressed (time t)1) The actual average concentration D of the organic solvent in the subsequent heating space 91Is increased. Actual average concentration D1The maximum value P of (a) is also smaller than that of embodiment 1 (fig. 5).
As described above, according to the coating and drying apparatus 30 of embodiment 2, the control unit 14 stops the coating of the coating unit 6 and controls the conveying speed of the conveying unit 4 to be low. Similarly, according to the coating and drying method of embodiment 2, in the coating stop step, the conveyance speed of the steel strip S is reduced in addition to the stop of the coating.
According to the control described above, the amount of the paint entering the heating space 9 per unit time can be reduced by reducing the conveying speed of the steel strip S, and therefore, the increase in the concentration of the organic solvent in the heating space 9 can be further suppressed. This can further improve safety.
In addition, although it saysThe conveyance speed is reduced, but when the conveyance is stopped, the portion of the continuous heating space 9 on the most upstream side of the steel strip S is also raised to the heating temperature of the dryer 8 (for example, 300 ℃), and the organic solvent is evaporated all at once from the entire paint stopped in the heating space 9, and therefore, the actual average concentration D is1May exceed the threshold concentration D4(refer to the evaporation amount 47 shown in FIG. 10). Therefore, when the conveyance speed is reduced, it is effective to set the speed not close to this state.
(embodiment mode 3)
A coating and drying apparatus 40 according to embodiment 3 of the present disclosure will be described. In embodiment 3, the differences from embodiment 1 will be mainly described. In embodiment 3, the same or equivalent structures as those in embodiment 1 are denoted by the same reference numerals and described. In embodiment 3, the description overlapping with embodiment 1 is omitted.
In embodiment 1, the concentration D is predicted to be reached3Is a prescribed threshold concentration D4In the above case, the control is performed so as to stop only the coating, but embodiment 3 differs in that the coating is stopped and the coated paint is removed before drying and sintering.
Fig. 8A to 8D and fig. 9 show an example of the operation of the coating and drying apparatus 40 according to embodiment 3 and an example of the change in the concentration of the organic solvent.
As shown in fig. 8A to 8D, the coating and drying apparatus 4 according to embodiment 3 includes a removing unit 42. The removing portion 42 is a member that removes the paint applied to the steel strip S at the applying position 7 at a position on the upstream side of the heating space 9 of the dryer 8. The removing section 42 shown in fig. 8A to 8D is a device having a plate that can be moved up and down, and scraping off paint on the steel strip S by pressing the tip of the plate against the surface of the steel strip S. The plate lifting of the removing unit 42 is controlled by the control unit 14. Further, a receiving tray 43 is provided below the plate, and the paint scraped off by the plate flows to the receiving tray 43 below.
As shown in fig. 9, at time t1Is based on measuring the concentration D2Calculated predicted concentration D of arrival3Exceeding a defined thresholdValue concentration D4Therefore, as shown in fig. 8A, the coating section 6 is retracted from the coating state to the standby state, and the coating by the coating section 6 is stopped.
In embodiment 3, the removal unit 42 removes the paint in addition to stopping the application by the application unit 6. Specifically, as shown in fig. 8A, the coating is scraped off by the tip of the plate by lowering the plate of the removal portion 42 and contacting the surface of the steel strip S. Thereby, the steel strip S in a state where the paint is not applied is conveyed to the heating space 9 of the dryer 8.
Fig. 8B shows a state where the steel strip S is continuously conveyed from the state shown in fig. 8A. In the state shown in fig. 8B, the evaporation of the organic solvent is ended at the evaporation end point 44. When compared with the evaporation end point 22 of embodiment 1 shown in fig. 4B, the evaporation end point 44 of embodiment 3 shown in fig. 8B is located at the same point. This is because embodiment 3 also maintains the same speed as embodiment 1 without changing the conveying speed of the conveying unit 4.
On the other hand, since the removal portion 42 removes the paint, the paint is not applied to the upstream side portion of the steel strip S in the heating space 9 as shown in fig. 8B, and the organic solvent does not evaporate. Coating end point 48 shown in fig. 8B is located on the downstream side of steel strip S from coating end point 29 shown in fig. 4B. Further, the evaporation amount 46 of the organic solvent shown in fig. 8B is greatly reduced from the evaporation amount 27 of the organic solvent shown in fig. 4B. Subsequently, as shown in fig. 8C, the plate of the removing portion 42 is raised and returned to the original position, and as shown in fig. 8D, the smeared portion is discharged.
As described above, since the removal portion 42 removes the coating material in addition to the stop of the coating by the coating portion 6, the amount of the coating material entering the heating space 9 per unit time can be reduced (0 in embodiment 3). This reduces the evaporation amount 46 of the organic solvent in the heating space 9, and can suppress an increase in the concentration of the organic solvent. As shown in fig. 9, the stop of the application in the application section 6 can be further suppressed (time t)1) The actual average concentration D of the organic solvent in the subsequent heating space 91So that the actual average concentration D is increased1The maximum value P of (a) becomes further lower. Thus, safer control can be realized.
As described above, the coating and drying device 40 according to embodiment 3 further includes the removing unit 42, and the coating material applied to the steel strip by the coating unit 6 is removed by the removing unit 42 at the upstream side of the heating space 9 of the dryer 8. Then, the predicted concentration D is reached3Is a prescribed threshold concentration D4In the above case, the control unit 14 stops the application by the application unit 6 and controls the removal unit 42 to remove the paint. Similarly, according to the coating and drying method of embodiment 3, the coating stop step includes a step of removing the paint applied to the steel strip S at the coating position 7 at a position on the upstream side of the heating space 9 in addition to the step of stopping the coating.
According to the above configuration, the amount of paint entering the heating space 9 per unit time can be reduced by removing the paint applied to the steel strip S (the paint in the idle running section 16) at the position on the upstream side of the heating space 9 of the dryer 8. This can further suppress an increase in the concentration of the organic solvent in the heating space 9, and can further improve safety.
The invention of the present disclosure has been described above with reference to embodiments 1 to 3, but the invention of the present disclosure is not limited to embodiments 1 to 3. For example, in embodiments 1 to 3, the case where the conveying unit 4 is configured by a plurality of rotating rollers has been described, but the present invention is not limited to this case, and any configuration may be adopted as long as the steel strip S can be continuously conveyed. In embodiments 1 to 3, the case where the coating section 6 is constituted by a roll coater has been described, but the present invention is not limited to this case, and any configuration (for example, a slit nozzle) may be adopted as long as the coating can be applied to the steel strip S. In embodiments 1 to 3, the case where the exhaust unit 10 includes the duct 10a and the blower 10b has been described, but the present invention is not limited to this case, and any configuration may be adopted as long as the exhaust of the air from the heating space 9 in the dryer 8 is possible.
In addition, in the above-described embodiments 1 to 3, the case where the coating and drying apparatus 2 is an apparatus that performs the drying and sintering process on the steel strip S has been described, but the present invention is not limited to this case, and can be applied to a coating and drying apparatus that performs only the drying process without performing the sintering process.
In addition, in embodiments 1 to 3, the case where the concentration measuring unit 12 is directly connected to the heating space 9 has been described, but the present invention is not limited to this case, and for example, the concentration measuring unit may be provided in the middle of the exhaust duct 10a of the exhaust unit 10. Even in this case, the organic solvent concentration of the ambient gas in the heating space 9 can be measured. As described above, the organic solvent concentration of the ambient gas in the heating space 9 may also be indirectly measured.
In embodiment 3, the case where the removing unit 42 has a liftable plate and is attached to the inlet of the dryer 8 has been described, but the present invention is not limited to this case. As long as the paint can be removed at a position upstream of the heating space 9 of the dryer 8, a removing portion having any configuration, such as a mechanism for sucking the undried liquid paint, may be employed.
In addition, in the above-described embodiments 1 to 3, the measured concentration D of the organic solvent based on the measurement by the concentration measuring section 12 after the start of the coating by the coating section 6 is measured2Value at the time of initial change from 0 to reach predicted concentration D3The case of performing the operation has been described, but the operation is not limited to this case. For example, the measurement of the organic solvent concentration may be continued, and the arrival prediction concentration D may be calculated based on the measured value at any time3And (6) performing operation.
In embodiments 2 and 3, in order to reduce the amount of the paint entering the heating space 9 per unit time, a case has been described in which the control of reducing the conveying speed of the conveying unit 4 (embodiment 2) or the control of removing the paint on the steel strip S by the removing unit 42 (embodiment 3) is performed, but the present invention is not limited to this case. Other control may be performed as long as it is control that can reduce the amount of the paint entering the heating space 9 per unit time.
In addition, by appropriately combining any of the various embodiments described above, the effects of each of the various embodiments can be achieved.
The present disclosure has been fully described in terms of the preferred embodiments with reference to the accompanying drawings, but it is apparent to those skilled in the art that various changes and modifications can be made. Such variations and modifications are to be understood as being included within the scope of the present disclosure as set forth in the following claims unless they depart therefrom. Further, combinations of elements or changes in the order of the elements of the embodiments can be implemented without departing from the scope and spirit of the present disclosure.
The present disclosure can be applied to any coating and drying apparatus and coating and drying method that perform coating, drying, and sintering while continuously conveying a steel strip.
The disclosures of the specification, drawings and claims of Japanese patent application No. 2016-240543, filed 2016, 12/2016 are hereby incorporated by reference in their entirety into this specification.

Claims (10)

1. A coating and drying device is provided with a coating and drying device,
coating and drying while continuously conveying the steel strip,
it is characterized by comprising:
a conveying unit that conveys the steel strip;
a coating unit that applies a coating material containing an organic solvent to the conveyed steel strip at a coating position;
a dryer that forms a heating space for drying the steel strip at a position downstream of the coating position;
an exhaust unit configured to exhaust the heating space;
a concentration measuring portion that measures an organic solvent concentration of the organic solvent in the heating space; and
a control unit that controls an operation of the coating and drying device,
the control unit calculates an arrival prediction concentration based on the organic solvent concentration measured by the concentration measurement unit, and controls the coating unit to stop coating while continuing the conveyance by the conveyance unit when the arrival prediction concentration is equal to or higher than a predetermined threshold concentration.
2. Coating and drying apparatus according to claim 1,
when the estimated arrival density is equal to or higher than the threshold density, the control unit stops the application by the application unit and controls the conveyance speed of the conveyance unit to be lower.
3. Coating and drying apparatus according to claim 1 or 2,
further comprising a removing section that removes the paint applied to the steel strip by the applying section at a position on an upstream side of the heating space,
when the estimated arrival concentration is equal to or higher than the threshold concentration, the control unit stops the application by the application unit and controls the removal unit to remove the paint.
4. Coating and drying apparatus according to claim 1 or 2,
when the estimated arrival concentration is equal to or higher than the threshold concentration, the control unit performs control so as to stop the application in the application unit while maintaining the exhaust gas amount in the exhaust unit at the same amount.
5. Coating and drying apparatus according to claim 3,
when the estimated arrival concentration is equal to or higher than the threshold concentration, the control unit performs control so as to stop the application in the application unit while maintaining the exhaust gas amount in the exhaust unit at the same amount.
6. A coating and drying method for coating and drying a steel strip while continuously conveying the steel strip,
it is characterized by comprising:
a step of conveying the steel strip;
a coating step of applying a coating material containing an organic solvent to the carried steel strip at a coating position;
a drying step of drying the steel strip through a heating space at a position downstream of the coating position;
an exhaust step of exhausting the heating space;
a measuring step of measuring an organic solvent concentration of the organic solvent in the heating space;
an operation step of operating an arrival prediction concentration based on the measured organic solvent concentration; and
and a coating stop step of stopping the coating while continuing the conveyance of the steel strip when the arrival prediction concentration is equal to or higher than a predetermined threshold concentration.
7. The coating drying method according to claim 6,
in the coating stop step, when the arrival prediction concentration is equal to or higher than the threshold concentration, the coating is stopped, and the conveying speed of the steel strip is reduced.
8. Coating drying method according to claim 6 or 7,
in the coating stop step, when the estimated arrival concentration is equal to or higher than the threshold concentration, the coating is stopped, and the coating material applied to the steel strip at the coating position is removed at a position upstream of the heating space.
9. Coating drying method according to claim 6 or 7,
in the coating stop step, when the estimated arrival concentration is equal to or higher than the threshold concentration, the coating is stopped while maintaining the same amount of exhaust gas.
10. The coating drying method according to claim 8,
in the coating stop step, when the estimated arrival concentration is equal to or higher than the threshold concentration, the coating is stopped while maintaining the same amount of exhaust gas.
CN201780076483.5A 2016-12-12 2017-11-02 Coating and drying device and coating and drying method Active CN110114150B (en)

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JP2016240543A JP6280194B1 (en) 2016-12-12 2016-12-12 Paint drying apparatus and paint drying method
JP2016-240543 2016-12-12
PCT/JP2017/039803 WO2018110137A1 (en) 2016-12-12 2017-11-02 Paint application and drying device and paint application and drying method

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