阅读说明：本技术 火焰处理装置、涂装金属板的制造装置及制造方法 (Flame treatment device, and device and method for manufacturing coated metal plate ) 是由 佐藤正树 铃木成寿 杉田修一 于 2019-01-17 设计创作，主要内容包括：本发明的技术问题在于提供能够不对金属系基材进行预热处理而进行火焰处理的火焰处理装置、涂装金属板的制造装置及制造方法。为了解决上述技术问题,火焰处理装置包括：第一温度测定部,其对金属系基材的火焰处理前温度进行测定；控制部,其基于由上述第一温度测定部测定出的上述火焰处理前温度,以使火焰处理时的上述金属系基材的表面温度成为56℃以上的方式决定火焰的燃烧能量；以及火焰处理部,其基于由上述控制部决定的上述燃烧能量,对上述金属系基材进行火焰处理。(The technical problem of the present invention is to provide a flame treatment apparatus, a coated metal sheet manufacturing apparatus and a coated metal sheet manufacturing method, which can perform flame treatment without performing preheating treatment on a metal base material. In order to solve the above technical problem, a flame treatment device includes: a first temperature measuring part for measuring the temperature of the metal base material before flame treatment; a control unit that determines the combustion energy of the flame so that the surface temperature of the metal base material during flame treatment becomes 56 ℃ or higher, based on the pre-flame treatment temperature measured by the first temperature measurement unit; and a flame treatment unit that performs a flame treatment on the metal base material based on the combustion energy determined by the control unit.)

1. A flame treatment apparatus, comprising:

a first temperature measuring part for measuring the temperature of the metal base material before flame treatment;

a control unit that determines the combustion energy of the flame so that the surface temperature of the metal base material during flame treatment is 56 ℃ or higher, based on the pre-flame treatment temperature measured by the first temperature measurement unit; and

And a flame treatment unit that performs a flame treatment on the metal base material based on the combustion energy determined by the control unit.

2. The flame treatment apparatus of claim 1,

further comprising a second temperature measuring part for measuring the temperature of the metal base material after the flame treatment,

the control unit determines the combustion energy based on the pre-flame treatment temperature and the post-flame treatment temperature.

3. The flame treatment apparatus of claim 2,

further comprises a humidity measuring unit for measuring the humidity of the outside air,

the control unit determines the combustion energy based on the humidity of the outside air, the pre-flame treatment temperature, and the post-flame treatment temperature.

4. The flame treatment device according to any of claims 1 to 3,

further comprising a conveying section for conveying the metal-based base material,

the first temperature measuring unit and the flame processing unit are arranged in this order along the conveying direction of the conveying unit.

5. A coated metal sheet manufacturing apparatus, comprising:

a coating film forming section for applying a coating material to a metal plate and forming a coating film; and

The flame treatment device according to any of claims 1 to 4,

the flame treatment device performs flame treatment on the coating film formed by the coating film forming part.

6. A method for manufacturing a coated metal sheet, comprising the steps of:

a coating film forming step of applying a coating material to a metal plate having a thermal conductivity of 10W/mK or more and forming a coating film on the metal plate;

a first temperature measurement step of measuring the temperature of the metal plate on which the coating film is formed; and

and a flame treatment step of determining the combustion energy of the flame so that the surface temperature of the coating film during the flame treatment becomes 56 ℃ or higher based on the temperature measured in the first temperature measurement step, and performing the flame treatment.

7. The coated metal sheet manufacturing method according to claim 6,

the flame treatment step is a step of determining the combustion energy based on the temperature measured in the first temperature measurement step and the thermal conductivity of the metal plate, and performing flame treatment.

8. The coated metal sheet manufacturing method according to claim 6 or 7,

the flame treatment step is a step of performing flame treatment so that the temperature of the surface of the coating film during flame treatment is 56 ℃ to 150 ℃.

9. The coated metal sheet manufacturing method according to claim 6,

further comprising a second temperature measurement step of measuring the temperature of the metal plate having the coating film formed thereon after the flame treatment step,

the flame treatment step is a step of determining the combustion energy based on at least the temperature measured in the first temperature measurement step and the temperature measured in the second temperature measurement step, and performing flame treatment.

10. The coated metal sheet manufacturing method according to claim 9, wherein,

further comprising a humidity measurement step of measuring the humidity of the outside air,

the flame treatment step is a step of determining the combustion energy based on at least the temperature measured in the first temperature measurement step, the temperature measured in the second temperature measurement step, and the humidity measured in the humidity measurement step, and performing flame treatment.

11. The coated metal sheet manufacturing method according to claim 6,

in the flame treatment step, the metal sheet having the coating film formed thereon is subjected to flame treatment while being conveyed in a predetermined direction,

The flame treatment step is a step of determining the combustion energy based on at least the temperature measured in the first temperature measurement step and the transport speed of the metal plate, and performing flame treatment.

12. The coated metal sheet manufacturing method according to claim 6,

the flame treatment step is a step of determining the combustion energy based on at least the temperature measured in the first temperature measurement step and the type of the combustible gas supplied at the time of the flame treatment, and performing the flame treatment.

13. The method for producing a coated metal sheet according to any one of claims 6 to 12, wherein,

the coating comprises a silicone resin.

Technical Field

The present invention relates to a flame treatment apparatus, a coated metal sheet manufacturing apparatus, and a coated metal sheet manufacturing method.

Background

Conventionally, a coating or ink containing a resin is used for a metal plate to improve functionality and design properties thereof, thereby increasing added value. When dust, dirt, etc. adhere to a metal plate to be coated or printed, the adhesion between the metal plate and a coating film is reduced, or the wettability of the metal plate is changed, making it difficult to perform desired coating. Therefore, studies have been made on flame treatment of a metal plate before coating. For example, patent document 1 discloses a method of heating a steel pipe to 100 ℃ or higher, removing moisture, dust, grease, and the like adhering to the surface by flame of a burner, and then applying a coating agent to the steel pipe.

On the other hand, coated metal sheets are often used in outdoor buildings, civil engineering structures, and the like. In such a coated metal sheet, there is a problem in that fouling is caused by adhesion of carbon-based pollutants contained in exhaust gas of automobiles, soot from factories, and the like. Among the stains, particularly, stains adhering along a raindrop (hereinafter, also referred to as "raindrop stains") are easily noticeable. In the conventional coated metal sheet, it is inevitable that such raindrop stains become conspicuous in a relatively short time, and therefore it is required to provide a method for producing a coated metal sheet in which raindrop stains are less likely to occur.

Therefore, in recent years, it has been proposed to prevent raindrop stains by making the contact angle of the coating film with water 60 ° or less, that is, by making the coating film hydrophilic. As one of methods for improving the hydrophilicity of a coating film, it has been proposed to apply a coating material containing a polyester resin or the like and an organosilicate or the like to a metal plate and subject the coating film to flame treatment, plasma treatment, corona discharge treatment or the like (patent document 2).

Disclosure of Invention

Problems to be solved by the invention

In the flame treatment, a burner using Liquefied Petroleum Gas (LPG) or Liquefied Natural Gas (LNG) as a fuel is generally used, and when liquefied petroleum gas is combusted, a chemical reaction represented by the following chemical formula occurs.

C₃H₈(LPG)+5O₂→3CO₂+4H₂Heat of oxygen + concentration

As can be seen from the above chemical formula, when the fuel is combusted, water is generated. On the other hand, the metal-based base material has high thermal conductivity. Therefore, there are the following problems: when a flame treatment is performed on a metal-based substrate, heat is rapidly diffused at the moment when the flame comes into contact with the metal-based substrate, and the temperature of the surface of the metal-based substrate is difficult to increase. As a result, water generated by the combustion of the fuel is cooled and condensed on the surface of the metal base material. If such condensation occurs, flame treatment is inhibited, and the desired effects as described in patent documents 1 and 2 cannot be obtained.

Therefore, studies have been made to perform a preheating treatment or the like on the metal base material in the flame treatment. However, when the preheating treatment is performed, the following problems occur: a heater for preheating is required, and the process becomes more complicated.

The present invention has been made in view of such a problem. Specifically, an object is to provide a flame treatment apparatus, a coated metal sheet manufacturing apparatus, and a coated metal sheet manufacturing method, which are capable of performing flame treatment without performing preheating treatment on a metal-based substrate.

Means for solving the problems

The first aspect of the present invention relates to the following flame treatment apparatus.

[1] A flame treatment apparatus, comprising: a first temperature measuring part for measuring the temperature of the metal base material before flame treatment; a control unit that determines the combustion energy of the flame so that the surface temperature of the metal base material during flame treatment is 56 ℃ or higher, based on the pre-flame treatment temperature measured by the first temperature measurement unit; and a flame treatment unit that performs flame treatment on the metal base material based on the combustion energy determined by the control unit.

[2] The flame processing apparatus according to [1], further comprising a second temperature measuring unit that measures a post-flame-processing temperature of the metal base material, wherein the control unit determines the combustion energy based on the pre-flame-processing temperature and the post-flame-processing temperature.

[3] The flame treatment device according to [2], further comprising a humidity measurement unit that measures humidity of outside air, wherein the control unit determines the combustion energy based on the humidity of outside air, the pre-flame treatment temperature, and the post-flame treatment temperature.

[4] The flame treatment apparatus according to any one of [1] to [3], further comprising a conveying section that conveys the metal-based substrate, wherein the first temperature measurement section and the flame treatment section are arranged in this order along a conveying direction of the conveying section.

The second aspect of the present invention relates to the following apparatus for producing a coated metal sheet.

[5] A manufacturing apparatus of a coated metal sheet, comprising: a coating film forming section for applying a coating material to a metal plate and forming a coating film; and the flame treatment apparatus according to any one of [1] to [4], wherein the flame treatment apparatus performs a flame treatment on the coating film formed by the coating film forming section.

The third aspect of the present invention relates to the following method for producing a coated metal sheet.

[6] A method for manufacturing a coated metal sheet, comprising the steps of: a coating film forming step of applying a coating material to a metal plate having a thermal conductivity of 10W/mK or more and forming a coating film on the metal plate; a first temperature measurement step of measuring the temperature of the metal plate on which the coating film is formed; and a flame treatment step of determining the combustion energy of the flame so that the surface temperature of the coating film during the flame treatment becomes 56 ℃ or higher based on the temperature measured in the first temperature measurement step, and performing the flame treatment.

[7] The method of manufacturing a coated metal sheet according to item [6], wherein the flame treatment step is a step of determining the combustion energy based on the temperature measured in the first temperature measurement step and the thermal conductivity of the metal sheet, and performing flame treatment.

[8] The method for producing a coated metal sheet according to item [6] or [7], wherein the flame treatment step is a step of performing flame treatment so that the temperature of the surface of the coating film at the time of flame treatment is 56 ℃ or higher and 150 ℃ or lower.

[9] The method for producing a coated metal sheet according to item [6], further comprising a second temperature measurement step of measuring a temperature of the metal sheet having the coating film formed thereon after the flame treatment step, wherein the flame treatment step is a step of determining the combustion energy based on at least the temperature measured in the first temperature measurement step and the temperature measured in the second temperature measurement step, and performing flame treatment.

[10] The method for producing a coated metal sheet according to item [9], further comprising a humidity measurement step of measuring the humidity of the outside air, wherein the flame treatment step is a step of determining the combustion energy based on at least the temperature measured in the first temperature measurement step, the temperature measured in the second temperature measurement step, and the humidity measured in the humidity measurement step, and performing flame treatment.

[11] The method for producing a coated metal sheet according to item [6], wherein the flame treatment step comprises performing the flame treatment while conveying the metal sheet having the coating film formed thereon in a predetermined direction, and the flame treatment step comprises determining the combustion energy based on at least the temperature measured in the first temperature measurement step and the conveying speed of the metal sheet, and performing the flame treatment.

[12] The method for producing a coated metal sheet according to item [6], wherein the flame treatment step is a step of determining the combustion energy based on at least the temperature measured in the first temperature measurement step and a type of the combustible gas supplied at the time of the flame treatment, and performing the flame treatment.

[13] The method for producing a coated metal sheet according to any one of [6] to [12], wherein the coating material contains a silicone resin.

Effects of the invention

According to the flame treatment apparatus of the present invention, it is possible to perform flame treatment on a metal-based substrate without performing preheating treatment and without condensing moisture generated by combustion of fuel.

Drawings

FIG. 1 is a side view of a flame treatment apparatus.

Fig. 2A is a side view of a burner head of the burner for flame treatment, fig. 2B is a front view of the burner head, and fig. 2C is a bottom view of the burner head.

Fig. 3 is a side view of the manufacturing apparatus for coated metal sheets.

Detailed Description

1. Flame treatment device

The flame treatment apparatus of the present invention is an apparatus for flame treating a metal-based substrate. The flame treatment device of the present invention is a device for flame treating a member including a member which is likely to cause condensation during flame treatment, that is, a member having high thermal conductivity, and is very useful for flame treating a metal base material including a metal plate having thermal conductivity of 10W/mK or more. Hereinafter, a flame treatment apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a side view of the flame treatment device according to the present embodiment. The flame treatment device 100 of the present embodiment includes: a conveying section 15 for conveying the metal base material 10; a first temperature measuring unit 11 for measuring the temperature of the metal base material 10 before flame treatment; a second temperature measuring unit 14 for measuring the temperature of the metal base material 10 after the flame treatment; a humidity measurement unit 16 for measuring the humidity of the outside air; a control unit 12 that determines the combustion energy of the flame so that the surface temperature of the metal base material 10 during flame treatment becomes 56 ℃ or higher, based on the pre-flame treatment temperature, the post-flame treatment temperature, the humidity of the outside air, and the like; and a flame treatment unit 13 for flame-treating the metal base material 10 based on the combustion energy determined by the control unit 12. In the present specification, the combustion energy of the flame means the total heat quantity of the flame emitted per unit area of the metal base material 10.

The conveying section 15 is not particularly limited as long as it can convey the metal-based substrate 10 at a constant speed, and may be, for example, a known conveyor including a metal endless belt and a driving section for rotating the endless belt at a constant speed. The conveying speed of the conveying unit 15 with respect to the metal-based substrate 10 may be controlled by the conveying unit 15 itself, or may be controlled by a control unit 12 described later.

The first temperature measuring unit 11 is a mechanism for measuring the temperature of the surface to be flame-treated of the metal base material 10 before the flame treatment and outputting the temperature to the control unit 12. The first temperature measuring unit 11 may be one or more temperature sensors disposed upstream of the flame treatment unit 13, which will be described later, in the conveying direction of the metal base material 10. In the present specification, the temperature of the metal-based substrate 10 before the flame treatment is the temperature of the metal-based substrate 10 in a state of being within 30 seconds before the start of the flame treatment.

On the other hand, the second temperature measuring unit 14 is a mechanism for measuring the temperature of the metal base material 10 after the flame treatment and outputting the temperature to the control unit 12. The second temperature measuring unit 14 may be one or more temperature sensors disposed on the downstream side in the conveying direction of the metal base material 10 from the flame treatment unit 13 described later. In the present specification, the post-flame treatment temperature of the metal base material 10 means the temperature of the metal base material 10 in a state of being within 20 seconds from the end of the flame treatment.

Here, the types of the first temperature measuring unit 11 and the second temperature measuring unit 14 are not particularly limited, and may be a contact type temperature sensor or the like, but in the present embodiment, the first temperature measuring unit 11 and the second temperature measuring unit 14 are non-contact type temperature sensors in terms of being able to measure the temperature without damaging the metal base material 10.

In the present embodiment, the first temperature measuring unit 11 and the second temperature measuring unit 14 are each configured by only one temperature sensor, but the first temperature measuring unit 11 and/or the second temperature measuring unit 14 may be configured by a plurality of temperature sensors. When the first temperature measuring unit 11 or the second temperature measuring unit 14 is configured by a plurality of temperature sensors, they may be arranged in a line perpendicular to the conveying direction, for example. By disposing a plurality of temperature sensors in this manner, it is possible to grasp variations in the pre-flame treatment temperature or the post-flame treatment temperature in the direction perpendicular to the conveying direction of the metal base material 10.

In the flame treatment apparatus 100 of the present embodiment, the first temperature measuring unit 11 and the second temperature measuring unit 14 are disposed on the side of the metal base material 10 on which the flame is to be treated, but they may be disposed on the side of the metal base material 10 opposite to the side on which the flame is to be treated (hereinafter, also referred to as the "back surface"). When the flame treatment is performed by the flame treatment unit 13, steam and carbon dioxide are generated by combustion of the fuel. Further, if they exist between the first temperature measuring unit 11, the second temperature measuring unit 14, and the flame treatment unit 13, the temperature may not be measured accurately. In contrast, by disposing the first temperature measuring unit 11 and the second temperature measuring unit 14 on the back side of the metal base material 10, the temperature can be accurately measured without being easily affected by water vapor or carbon dioxide. However, depending on the thickness of the metal-based substrate 10 or the thermal conductivity thereof, the temperature of the back surface of the metal-based substrate 10 may be different from the temperature of the surface to be flame-treated. Therefore, in this case, the control unit 12 described later performs an arithmetic process to calculate the temperature of the flame-treated surface side of the metal base material 10 from the temperature of the rear surface of the metal base material 10.

On the other hand, the humidity measuring unit 16 included in the flame treatment device 100 of the present embodiment may be a known humidity sensor or the like as long as it can measure the humidity of the outside air. In the flame treatment section 13 described later, although a flame is generated by mixing a combustible gas and a combustion-supporting gas, condensation is likely to occur during flame treatment if the amount of water contained in the combustion-supporting gas is large. Therefore, in the present embodiment, the control unit 12 determines the combustion energy of the flame in consideration of the humidity of the outside air.

The humidity measured by the humidity measuring unit 16 is not particularly limited as long as it is a humidity in the vicinity of the flame treatment device 100. However, in the vicinity of the flame treatment portion 13, there is a possibility that the humidity may change due to the combustion of the fuel. Therefore, the humidity measuring unit 16 preferably measures the humidity at a position that is less susceptible to the flame of the flame treatment unit 13. In the present embodiment, the humidity measuring unit 16 is disposed upstream of the flame treatment unit 13, but may be disposed downstream of the flame treatment unit 13, or may be disposed near the combustion-supporting gas intake port of the flame treatment unit 13. In the present embodiment, the humidity measuring unit 16 is configured by only one humidity sensor, but the humidity measuring unit 16 may be configured by a plurality of humidity sensors.

On the other hand, the control unit 12 in the present embodiment is not particularly limited as long as it has a processing unit capable of receiving the temperature of the metal-based substrate 10 before the flame treatment measured by the first temperature measuring unit 11, the temperature of the metal-based substrate 10 after the flame treatment measured by the second temperature measuring unit 14, and the humidity of the outside air measured by the humidity measuring unit 16, determining the combustion energy of the flame so that the temperature of the surface of the metal-based substrate at the time of the flame treatment becomes 56 ℃. The control unit 12 may determine the combustion energy based on not only the temperature of the metal-based substrate 10 before the flame treatment, the temperature of the metal-based substrate 10 after the flame treatment, and the humidity of the outside air, but also the type of the combustible gas supplied to the flame treatment unit 13, the transport speed of the metal-based substrate 10 by the transport unit 15, the thickness of the metal-based substrate 10, and the like. By setting the combustion energy to such a combustion energy that the temperature of the surface of the metal base material 10 during the flame treatment becomes 56 ℃ or higher, condensation is less likely to occur on the surface of the metal base material 10.

The control unit 12 may include, in addition to the processing unit, an input unit for inputting information such as thermal conductivity of the metal-based substrate, a display unit for displaying various information, a storage unit for storing various information including a control program executed by the control unit 12, and the like.

Here, the arrangement position of the control unit 12 is not particularly limited as long as it is a position at which data can be transmitted and received to and from the first temperature measuring unit 11, the flame processing unit 13, the second temperature measuring unit 14, the humidity measuring unit 16, the conveying unit 15, and the like.

On the other hand, the flame treatment section 13 is a mechanism for performing flame treatment on the metal base material 10 based on the combustion energy determined by the control section 12. In the present embodiment, the flame treatment section 13 includes: the flame treatment section 13 may include a combustible gas supply source, a combustion-supporting gas supply source, a gas mixing section for mixing a combustible gas and a combustion-supporting gas, a gas supply pipe for supplying a combustible gas (a mixed gas of a combustible gas and a combustion-supporting gas), and a burner head for burning the combustible gas supplied from the gas supply pipe.

Fig. 2A is a side view, fig. 2B is a front view, and fig. 2C is a bottom view of the burner head 132 of the flame treatment section 13 shown in fig. 1. The burner head 132 is not particularly limited as long as it has a housing 132a connected to the gas supply pipe 133 and a flame hole 132b disposed on one surface of the housing 132a, and the combustible gas supplied from the gas supply pipe 133 can be burned in the flame hole 132 b. Note that, for convenience of explanation, in fig. 2A and 2B, the portions corresponding to the flame ports 132B are highlighted by thick lines, but actually, the flame ports 132B cannot be visually confirmed from the side or front.

The flame ports 132b are through holes provided in the bottom surface of the casing 132 a. The shape of the flame hole 132b is not particularly limited, and may be a rectangular shape or a circular hole shape. However, the rectangular shape is particularly preferable from the viewpoint of uniformly performing the flame treatment perpendicularly to the conveying direction of the metal-based substrate 10. The width of the flame holes 132B in the direction perpendicular to the conveyance direction of the metal base material 10 (the width indicated by W in fig. 2B) may be about 50 to 150cm, for example, as long as it is the same as or larger than the width of the metal base material 10 to be subjected to flame treatment. On the other hand, the width of the flame ports 132b in the direction parallel to the conveying direction of the metal-based substrate 10 (the width indicated by L in fig. 2A) may be appropriately set in accordance with the ejection stability of the combustible gas, and may be set to, for example, about 1 to 8 mm. Burners having a Burner head of such a structure are commercially available, and examples thereof include a product having a brand name of F-3000 by the company Flynn Burner (usa), a product having a brand name of FFP250 by the company FinecomI & T (korea), and the like.

The gas supply pipe included in the flame treatment unit 13 has one end connected to the burner head 132 and the other end connected to the gas mixing unit. The gas mixing section is connected to a combustible gas supply source such as a combustible gas bottle and a combustion-supporting gas supply source such as an air bottle, an oxygen bottle, a compressed air machine, and a blower, and is configured to pre-mix the combustible gas and the combustion-supporting gas. The flame treatment section 13 may be provided with an oxygen supplier for supplying oxygen to the gas supply source as needed so that the concentration of oxygen in the combustible gas supplied from the gas mixing section to the gas supply pipe is constant.

The burner head 132 of the flame treatment unit 13 is disposed above the conveying unit 15 with a gap from the upper surface of the conveying unit 15, and the flame is ejected from the flame ports to the metal base material 10 passing between the conveying unit 15 and the burner head 132. The distance between the burner head 132 and the metal-based substrate 10 can be appropriately selected according to the combustion energy, the thickness of the metal-based substrate 10, and the like. The distance between the flame hole of the burner head 132 and the surface to be flame-treated of the metal base material 10 is preferably about 10 to 120mm, more preferably about 10 to 80mm, and still more preferably 20 to 50 mm. When the distance between the burner head 132 and the metal-based base material 10 is too close, the metal-based base material 10 may contact the burner head 132 due to warpage of the metal-based base material 10. On the other hand, in the case where the distance between the burner head 132 and the metal-based substrate 10 is too far, a large amount of energy is required for flame treatment. In the present embodiment, the burner head 132 is disposed so as to emit the flame perpendicularly to the surface of the metal base material 10, but the burner head 132 may be disposed so as to emit the flame at a certain angle to the surface of the metal base material 10.

Next, a flame treatment method using the flame treatment apparatus 100 of the present embodiment will be described. In the flame treatment using the flame treatment apparatus 100 of the present embodiment, first, the metal-based substrate 10 is conveyed in a constant direction at a constant speed by the conveying section 15. In this case, the conveying speed of the metal base material 10 is appropriately selected according to the desired combustion energy, and may be usually 5 to 150 m/min, more preferably 20 to 100 m/min, and still more preferably 30 to 80 m/min. By conveying the metal base material 10 at a speed of 5 m/min or more, the flame treatment can be efficiently performed, and an excessive increase in the temperature of the metal base material 10 can be suppressed. On the other hand, when the transport speed of the metal-based substrate 10 is too high, a gas flow is likely to be generated by the movement of the metal-based substrate 10, and the flame treatment may be uneven.

Next, the humidity measuring unit 16 measures the humidity of the outside air, and outputs the measured temperature to the control unit 12 (humidity measuring step). The humidity measuring unit 16 may measure the humidity continuously or may measure the humidity as needed. The first temperature measuring unit 11 measures the temperature of the surface or the back surface to be flame-treated of the metal base material 10 conveyed by the conveying unit 15, and outputs the measured temperature to the control unit 12 (first temperature measuring step). The first temperature measuring unit 11 may measure the temperature of the surface or the back surface of the metal base material 10 to be flame-treated continuously, or may measure the temperature intermittently at regular intervals.

The control unit 12, which has received the humidity and the pre-flame treatment temperature from the humidity measuring unit 16 and the first temperature measuring unit 11, determines the combustion energy based on the information (thermal conductivity, thickness, etc.) of the metal-based base material 10, the humidity, the pre-flame treatment temperature, etc., which are input in advance, and controls the flame treatment unit 13 (flame treatment process). The combustion energy may be determined in consideration of the transport speed of the metal-based substrate 10, the type of the combustible gas supplied to the flame treatment unit 13, and the like. As a specific method, the control unit 12 compares the pre-flame treatment temperature and humidity with a calibration curve or the like prepared in advance for the metal base material 10, and calculates the amount of heat required to raise the temperature of the surface to be flame-treated of the metal base material 10 to 56 ℃. The amount of heat required for surface treatment of the metal base material 10 and the amount of heat required for raising the temperature of the metal base material 10 are summed up and used as combustion energy to perform flame treatment by the flame treatment unit 13. The calibration curve may be prepared based on the transport speed of the metal-based substrate 10 and the type of combustible gas. By using such a calibration curve, the surface temperature of the metal-based substrate 10 during flame treatment can be controlled to 56 ℃ or higher more accurately. Then, based on the combustion energy, the amount of flame emission from the metal base material 10 is adjusted by adjusting the amount of gas supplied from the gas supply pipe of the flame treatment unit 13. The method of controlling the flame treatment section 13 based on the combustion energy is not limited to the adjustment of the gas supply amount, and may be, for example, a method of changing the distance between the flame ports of the burner head 132 of the flame treatment section 13 and the surface to be flame-treated of the metal base material 10.

Here, the output of the flame emitted from the flame treatment section 13 is preferably adjusted within a range of 250 kJ/hr to 14000 kJ/hr, more preferably within a range of 1000 kJ/hr to 12000 kJ/hr, and even more preferably within a range of 2000 kJ/hr to 10000 kJ/hr per 10mm width of the flame hole of the burner head 132. If the output per 10mm width of the flame hole is less than 250 kJ/hr, it becomes difficult to instantaneously raise the temperature of the metal-based substrate 10 to 60 ℃ or higher and perform flame treatment. On the other hand, if the output per 10mm width of the flame hole exceeds 14000 kJ/hr, the flow rate of the combustible gas becomes too high, and the flame shape becomes unstable, which may cause troubles such as treatment unevenness.

Examples of the gas to be burned in the flame treatment section 13 include: hydrogen, Liquefied Petroleum Gas (LPG), Liquefied Natural Gas (LNG), acetylene gas, propane gas, butane, and the like. Among them, LPG or LNG is preferable, and LPG is particularly preferable, from the viewpoint of easy formation of a desired flame. On the other hand, examples of the combustion-supporting gas include air and oxygen, and air is preferable from the viewpoint of operability and the like.

The mixing ratio of the combustible gas and the combustion-supporting gas in the combustible gas supplied to the burner head 132 through the gas supply portion can be appropriately set according to the types of the combustible gas and the combustion-supporting gas. For example, when the combustible gas is LPG and the combustion-supporting gas is air, the volume of air is preferably 24 to 27, more preferably 25 to 26, and still more preferably 25 to 25.5, relative to the volume 1 of LPG. When the combustible gas is LNG and the combustion-supporting gas is air, the volume of air is preferably 9.5 to 11, more preferably 9.8 to 10.5, and still more preferably 10 to 10.2, relative to the volume 1 of LNG.

On the other hand, in the flame treatment apparatus 100 of the present embodiment, the second temperature measuring unit 14 measures the post-flame treatment temperature of the metal base material 10 after the flame treatment by the flame treatment unit 13, and outputs the temperature to the control unit 12. That is, whether or not the post-flame treatment temperature is within a desired range (for example, 56 ℃ or higher in the case of measurement from the surface side to be flame-treated; for example, 56 ℃ or higher in the case of measurement from the back surface side, although the desired range varies depending on the thermal conductivity of the metal-based base material 10, the intensity of the flame emitted from the flame treatment section 13, and the like) is checked by the post-flame treatment temperature, and the flame treatment conditions are appropriately corrected by the control section 12. The second temperature measuring unit 14 may continuously measure the temperature of the surface or the back surface of the metal base material 10 to be flame-treated, or may measure the temperature as needed.

(others)

In the above, the embodiment has been described in which the control unit determines the combustion energy based on the pre-flame treatment temperature measured by the first temperature measuring unit, the post-flame treatment temperature measured by the second temperature measuring unit, the humidity measured by the humidity measuring unit, the thermal conductivity of the metal-based substrate, the thickness of the metal-based substrate, the transport speed of the transport unit with respect to the metal-based substrate, the type of combustible gas, and the like, but the control unit may determine the combustion energy based only on the pre-flame treatment temperature measured by the first temperature measuring unit. In this case, the combustion energy may be corrected as necessary with reference to the post-flame treatment temperature or humidity. The flame treatment device may not have a humidity measurement unit or a second temperature measurement unit. The combustion energy may be determined by arbitrarily combining two or more of the temperature before flame treatment, the temperature after flame treatment, the humidity, the thermal conductivity of the metal base material, the thickness of the metal base material, the transport speed of the metal base material, and the type of the combustible gas.

In the above embodiment, the case where the metal base material 10 is flat was described as an example, but the metal base material 10 may be wound in a coil shape or the like. The thickness and width of the metal base material 10 are not particularly limited, and may be appropriately selected according to the type and use of the metal base material 10.

(Effect)

As described above, the conventional flame treatment device has the following problems: when a metal base material is subjected to flame treatment, water generated by combustion of fuel tends to condense on the surface of the metal base material, and thus the flame treatment of the metal base material cannot be sufficiently performed. Further, in order to suppress condensation, there is a case where a treatment such as preliminary heating of the metal-based substrate before the flame treatment is performed, but there is still a problem in that the treatment apparatus is large in size and the process becomes complicated.

In contrast, in the flame treatment apparatus of the present invention, the control unit determines the combustion energy so that the surface temperature of the metal base material during the flame treatment becomes 56 ℃ or higher. That is, in the flame treatment apparatus of the present invention, the flame treatment is performed so that the surface temperature of the metal-based base material becomes 56 ℃ or higher at the same time as the start of the flame treatment. Therefore, even if moisture is generated by the combustion of the fuel, condensation is less likely to occur on the surface of the metal base material, and flame treatment is less likely to be inhibited. As a result, for example, hydrophilization treatment of the metal base material, removal of dust, grease, and the like adhering to the surface of the metal base material, and the like can be efficiently and uniformly performed.

2. Apparatus for manufacturing coated metal plate

The apparatus for manufacturing a coated metal sheet according to the present invention is an apparatus for manufacturing a coated metal sheet having a coating film on a metal sheet, and may include: a coating film forming section for forming a coating film by applying a coating material to a metal plate, and a flame treatment device for flame-treating the coating film.

The type of the metal plate used for producing the coated metal plate is not particularly limited, and as described above, when a metal base material including a metal plate having a thermal conductivity of 10W/mK or more is subjected to flame treatment, condensation is likely to occur on the surface thereof. Therefore, the apparatus for manufacturing a coated metal sheet according to the present invention is useful for manufacturing a coated metal sheet by forming a coating film on a metal sheet having a thermal conductivity of 10W/mK or more.

The kind of such metal sheet is not particularly limited, and examples thereof include a plated steel sheet such as a hot-dip Zn-55% Al alloy plated steel sheet; steel plates such as ordinary steel plates and stainless steel plates; an aluminum plate; copper plate, etc. Further, a chemical conversion coating film, an undercoat coating film, or the like may be formed on the surface of the metal plate within a range not to impair the effects of the present invention. The metal plate may be subjected to embossing, deep drawing, or other embossing processes as long as the effects of the present invention are not impaired.

The type of the coating material to be applied to the metal plate is not particularly limited, but by applying a coating material containing a silicone resin described later and flame-treating the coating material, a coated metal plate having a highly hydrophilic surface and being less likely to cause raindrop stains can be obtained. Next, an apparatus for manufacturing a coated metal sheet according to an embodiment of the present invention will be described in detail with reference to fig. 3, but the present invention is not limited to this embodiment.

The coated metal sheet manufacturing apparatus 200 of the present embodiment includes a coating film forming section 20 for forming a coating film on a metal sheet 23, and a flame treatment apparatus 100 for performing flame treatment on the coating film formed by the coating film forming section 20. In the coated metal sheet manufacturing apparatus 200 of the present embodiment, the conveying section of the coating film forming section 20 is common to the conveying section 15 of the flame treatment apparatus 100, but the conveying section of the coating film forming section 20 and the conveying section of the flame treatment apparatus 100 may be formed separately. In the coated metal sheet manufacturing apparatus 200, another configuration may be included between the coating film forming section 20 and the flame treatment apparatus 100. Here, since the flame treatment apparatus 100 included in the coated metal sheet manufacturing apparatus 200 of the present embodiment is the same as the flame treatment apparatus 100 described above, the same reference numerals are given to the respective components, and the description thereof is omitted.

The coating film forming section 20 in the coated metal sheet manufacturing apparatus 200 of the present embodiment includes a coating section 21 for coating a coating material and a curing section 22 for curing the coating material. The coating section 21 is a mechanism for coating the metal plate 23 with paint, and is a roll coater in the present embodiment. However, the type of the coating section 21 is not limited to the roll coater, and may be appropriately selected according to the type of the coating material, the type, size, shape, and the like of the metal plate. The coating section 21 may be a known spin coater, curtain coater, spray coater, dip coater, inkjet device, or the like.

On the other hand, the curing section 22 is a mechanism for curing the paint applied by the applying section 21, and is an oven in the present embodiment. In addition, in order to cure the paint in a short time, the curing section 22 (oven) of the present embodiment has an air blowing function capable of blowing air so that the plate surface air velocity becomes 0.9m/s or more. However, the type of the curing part 22 is not limited to the oven, and may be appropriately selected according to the type of the paint, and the curing part 22 may be an ultraviolet irradiation mechanism or the like in the case where the paint has ultraviolet curability.

Next, a method for producing a coated metal sheet using the apparatus for producing a coated metal sheet according to the present embodiment will be described. In the method for producing a coated metal sheet using the apparatus 200 for producing a coated metal sheet according to the present embodiment, first, the metal sheet 23 is conveyed in a constant direction at a constant speed by the conveying section 15. The transport speed of the metal plate 23 may be the same as the transport speed of the metal-based substrate 10 in the flame treatment apparatus 100 described above. Then, in the coating section 21, a paint is applied to the surface of the metal plate 23 conveyed by the conveying section 15 (paint application step). The coating film thickness at this time can be appropriately selected according to the kind of the coated metal sheet, and it is preferable to coat the metal sheet so that the thickness of the cured film (coating film) is about 3 to 30 μm. The thickness is a value obtained by a gravimetric method from the specific gravity of the coating film and the difference in weight between the coated metal sheets before and after the coating film is removed by sandblasting or the like. When the coating film is too thin, the durability and hiding property of the coating film may be insufficient. On the other hand, when the coating film is too thick, the production cost may increase and foaming may occur during curing.

The type of the coating material applied by the coating portion 21 is not particularly limited, but as described above, a coating material containing a silicone resin is preferable. Such a coating material may contain a resin, a curing agent, inorganic particles, organic particles, a coloring pigment, a solvent, and the like as necessary, in addition to the silicone resin. In the present specification, the silicone resin refers to a compound obtained by partial hydrolysis and condensation of an alkoxysilane, which is a polymer soluble in an organic solvent, but which has not yet gelled, although mainly having a three-dimensional crosslinked structure. The three-dimensional crosslinked structure contained in the silicone resin is not particularly limited, and may be, for example, any of a cage-like structure, a ladder-like structure, and a random structure. In the present specification, a tetraalkoxysilane and a condensate (organosilicate) obtained by hydrolytic condensation of only tetraalkoxysilane are not included in the silicone resin.

Since the silicone resin contains a three-dimensional cross-linked structure, when the coating material is applied to the metal plate 23, the silicone resin is transferred to the surface side of the film. When the film containing such a silicone resin is subjected to flame treatment by the flame treatment apparatus 100, organic groups (for example, methyl groups, phenyl groups, and the like) contained in the silicone resin are uniformly removed, and silanol groups and siloxane bonds are introduced into the surface of the coating film. As a result, the hydrophilicity of the surface of the finally obtained coated metal sheet is uniformly improved, and the rainmark fouling resistance is extremely improved. In addition, the silicone resin is uniformly aligned on the surface of the coating film, and the scratch resistance of the coating film is also improved.

The weight average molecular weight of the silicone resin contained in the coating is preferably 700 to 50000, and more preferably 1000 to 10000. If the weight average molecular weight of the silicone resin is less than 700, the silicone resin is likely to volatilize in the cured part 22, and the cured part 22 may be contaminated or the rainstain resistance may be insufficient. On the other hand, if the weight average molecular weight exceeds 50000, the viscosity of the coating material tends to increase, and it may be difficult to uniformly coat the coating material in the coating portion 21. The weight average molecular weight of the silicone resin is a polystyrene equivalent amount measured by Gel Permeation Chromatography (GPC).

The coating material preferably contains 1 to 10 parts by mass of a silicone resin, more preferably 2 to 6 parts by mass, per 100 parts by mass of the solid content. When the coating contains the silicone resin in the above range, the hydrophilicity of the coating film surface after flame treatment is sufficiently improved, and the rainstain resistance of the coated metal sheet is good. In addition, the hardness of the coating film surface is also high.

On the other hand, the resin contained in the coating material may be any component that serves as a binder of the coating film. Examples of the resin include: and polymer compounds such as polyester resins, polyester urethane resins, amino-polyester resins, acrylic urethane resins, amino-acrylic resins, polyvinylidene fluoride resins, polyurethane resins, epoxy resins, polyvinyl alcohol resins, phenol resins, and fluorine resins. Among these, polyester resins, polyester urethane resins, amino-polyester resins, acrylic urethane resins, amino-acrylic resins, and polyvinylidene fluoride resins are preferable because of low adhesion of dirt, and polyester resins or acrylic resins are particularly preferable because of high weather resistance.

The amount of the resin contained in the paint can be appropriately selected according to the kind of the resin to be coated on the metal plate. From the viewpoint of strength of the obtained coating film, the resin is preferably 25 to 60 parts by mass, more preferably 30 to 50 parts by mass, per 100 parts by mass of the solid content.

The type or amount of the curing agent to be contained in the coating material as needed may be appropriately selected depending on the application of the coated metal sheet or the type of the resin, and the amount of the curing agent is preferably 5 to 20 parts by mass, more preferably 7 to 15 parts by mass, based on 100 parts by mass of the resin. When the amount of the curing agent is within the above range, the curing property of the coating film obtained from the coating material is good.

The coating material may contain known inorganic particles or organic particles. The average particle diameter is preferably 4 to 80 μm, more preferably 10 to 60 μm. The average particle diameter of the inorganic particles and the organic particles is a value measured by a coulter counter method. The shape of the inorganic particles or organic particles is not particularly limited, but is preferably substantially spherical from the viewpoint of easy adjustment of the surface state of the obtained coating film. The amount of the inorganic particles and/or organic particles contained in the coating material can be appropriately selected according to the desired surface state of the coating film, and is preferably 1 to 40 parts by mass in total per 100 parts by mass of the solid content of the coating material.

The coating material may contain a coloring pigment as needed. The average particle diameter of the coloring pigment may be, for example, 0.2 to 2.0 μm. The coating material may contain an organic solvent as needed. The organic solvent is not particularly limited as long as it can sufficiently dissolve or disperse the silicone resin, the curing agent, the inorganic particles, the organic particles, and the like.

After the coating with the paint is performed by the coating section 21, the metal plate 23 is conveyed toward the curing section 22 by the conveying section 15, and the coating film is cured by the curing section 22 (in the present embodiment, an oven) (paint curing step). In the present embodiment, the metal plate 23 is preferably heated to 120 to 300 ℃, more preferably to 150 to 280 ℃, and even more preferably to 180 to 260 ℃ from the viewpoint of preventing decomposition of the resin or the like in the coating material and obtaining a homogeneous coating film. The heating time is not particularly limited, and is preferably 3 to 90 seconds, more preferably 10 to 70 seconds, and further preferably 20 to 60 seconds from the same viewpoint as described above.

In this case, the air may be blown so that the plate surface air velocity becomes 0.9m/s or more. In a general coating material, low molecular weight components in the coating material may volatilize to contaminate the cured portion 22. In contrast, in the above-described coating material, the silicone resin forms hydrogen bonds with other components. Therefore, even if the paint is cured while blowing air, the silicone resin is not easily volatilized, and thus the heating device is not easily contaminated.

Next, the metal plate (metal-based substrate 10) on which the coating film is formed is conveyed to the flame treatment apparatus 100 side by the conveying section 15, and the coating film is subjected to flame treatment. The surface of the coating film formed in the coating material application step and the coating material curing step (these are also collectively referred to as "coating film forming step") is subjected to flame treatment by the above method. In the present embodiment, the controller 12 preferably determines the combustion energy so that the surface temperature is 56 ℃ to 150 ℃ when the flame treatment is performed on the surface of the coating film. In other words, the controller 12 preferably adjusts the amount of flame emission of the flame treatment unit 13 so that the surface temperature of the coating film becomes 56 ℃ to 150 ℃ at the same time as the start of the flame treatment. When the surface temperature of the coating film containing the silicone resin or the cured product thereof exceeds 150 ℃, the hydrophilicity of the coating film tends to be low, and it is difficult to sufficiently improve the rainstain fouling resistance of the coated metal sheet.

(others)

In the above-described embodiment, the coating film is formed using the coating material containing the silicone resin and the coating film is subjected to the flame treatment, but the type of the coating material is not limited to the coating material containing the silicone resin, and for example, the coating film may be formed using the coating material containing the organosilicate or the like and the flame treatment may be performed.

(Effect)

In the apparatus for manufacturing a coated metal plate according to the present embodiment, after a coating film is formed on a metal plate, the coating film is subjected to flame treatment. In this coated metal sheet manufacturing apparatus, as described above, since the combustion energy is determined so that the surface temperature of the metal sheet (metal-based substrate) on which the coating film is formed becomes 56 ℃ or higher when the flame treatment is performed, even if moisture is generated by the combustion of the fuel, condensation is less likely to occur on the surface of the coating film, and the flame treatment is less likely to be inhibited. As a result, the metal base material 10 can be uniformly subjected to hydrophilization treatment, and a coated metal plate or the like having high rain mark dirt resistance can be obtained.