JP3838073B2 - Heating method and apparatus for laminated metal strip - Google Patents

Description

【００３５】
【表２】

【００３６】
【発明の効果】
本発明によれば、精密な温度制御により、ラミネート金属帯を板幅方向均一に所定の温度まで加熱することができるため、潤滑剤を表面に均一に塗布できる。その結果製品の品質と歩留を向上させることができる。
【図面の簡単な説明】
【図１】本発明によるラミネート金属帯の加熱方法およびその装置の一実施形態を示す説明図
【図２】本発明の電気ヒーターがラミネート金属帯幅方向に沿って配置される複数の加熱体からなることの一例を示す説明図
【図３】従来法のラミネート金属帯の加熱装置（温水ロール方式：制御なし）
【図４】従来法のラミネート金属帯の加熱装置（温水ロール方式：温水流量制御）
【符号の説明】
１ ラミネート金属帯
２ 加熱（温水）ロール
３ 加熱ロール用流量調整弁
４ 加熱装置入側温度計
５ 加熱装置出側温度計
６ 制御装置
７ 制御装置
８ 非接触型電気ヒーター
９ 遮蔽板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for heating a laminated metal strip on the entrance side of a lubricant application device for applying a lubricant to a laminated metal plate and the device therefor.
[0002]
[Prior art]
Heating a laminated metal strip coated with a resin film on the inlet side of a lubricant application device that applies molten lubricant is because the lubricant is repelled by the resin film in the process on the outlet side of the lubricant application device. This is because the lubricant layer is uniformly formed on the resin film. In addition, the lubricant is applied to the laminated metal strip to protect the resin film and metal sheet for a long period of time, to protect the resin film from friction with the mold during molding, and to provide appropriate sliding properties. It is.
[0003]
As shown in FIG. 3 or FIG. 4, a conventional method for heating a laminated metal strip is generally a method in which a laminated metal strip is wound around a heated roll (hot water roll) heated with hot water or the like and the temperature is raised.
[0004]
As an example in which such a hot water roll is used for heating a laminated metal strip, Japanese Patent Application Laid-Open No. 8-118544 discloses a laminated metal strip in which a resin film is coated on at least one surface of a metal thin plate, It shows a method of heating to a range of ± 20 ° C. of the melting point of the lubricant to be applied by bringing it into contact.
[0005]
[Problems to be solved by the invention]
However, the method disclosed in JP-A-8-118544 is a method for raising the temperature of a laminated metal strip using a hot water roll, and receives a heat from a hot water roll having a temperature difference of 100 ° C. or less, which has a small temperature difference from the laminated metal strip. Necessary. Further, uniform heating in the width direction is not necessarily performed, and temperature unevenness in the width direction is likely to occur. Therefore, there is a problem in that unevenness of the lubricant is very likely to occur when the lubricant is applied.
[0006]
Furthermore, if it is going to speed up the production line of a laminated metal strip, it is necessary to strengthen a heating roll in order to raise a heating capability, and there exists a problem in terms of equipment cost.
[0007]
Therefore, the present invention solves the above-mentioned problems of the prior art, and provides a method and apparatus for heating a laminated metal strip that improves the product yield by appropriate temperature control of the laminated metal strip and uniform temperature in the plate width direction. It is intended to provide.
[0008]
[Means for Solving the Problems]
The inventors of the present invention have provided a laminated metal strip that improves temperature uniformity in the width direction of the laminated metal strip and improves the product yield by using inexpensive equipment on the entry side of the lubricant coating device that applies the lubricant to the metal plate. If the electric heater is used on the downstream side of the heating roll in the line direction, it is less expensive than increasing the heating roll, and temperature unevenness in the width direction occurring in the laminated metal strip can be eliminated. I got the idea.
[0009]
Conventionally, a heating roll has been used to heat the metal strip by flowing hot water of 100 ° C or less inside, so that the transformation temperature of the resin (resin crystallinity (biaxial orientation)) is reduced. This is because the quality is easy to handle because it does not exceed about 110 ° C. at a temperature that is too high.
[0010]
Here, among the electric heaters, a non-contact type electric heater capable of heating only the surface layer of the laminated metal strip is preferable.
[0011]
However, when such an electric heater is used, it has been found that there are preferable types of electric heaters that can be used. Ordinary electric heaters have ultraviolet rays in their light rays, and depending on the type of resin coated on the laminated metal band, they are altered by the ultraviolet rays and the resin crystallinity (biaxial orientation) decreases. Since excessive resin film strength is reduced, it may not be used for laminated metal strips. Therefore, it is preferable to use an infrared heater that contains a small amount of ultraviolet rays in the light beam, particularly a far infrared heater that hardly contains ultraviolet rays. On the other hand, far-infrared heaters are equipped with an electric heater behind a ceramic-sprayed metal plate and use far-infrared rays that are generated by heating the ceramic. Since it takes several minutes, there is a problem that it is difficult to control the heating device outlet plate temperature to be constant in accordance with the speed change of the laminated metal strip.
[0012]
As a result of investigations, the inventors of the present invention have solved the above-described problems by bringing the laminated metal strip into contact with a heating roll and heating it to some extent, and then using an electric heater using a far-infrared heater to achieve the target temperature (T1). The electric heater is configured as a plurality of heating elements arranged along the width direction of the laminated metal band, and the heating direction by each of the heating elements is individually controlled so that the width direction of the laminated metal band is uniform temperature. Then, the temperature of the laminated metal strip is raised. Furthermore, it has been found that it is only necessary to provide a shielding plate having a variable opening between the electric heater and the laminated metal band so that the electric heater outlet plate temperature can be maintained even if the line speed changes.
[0013]
The present invention has been made based on such findings, and the features thereof are as follows.
[0014]
(1) A method of heating a laminated metal strip to a target temperature (T1) on the entry side of a lubricant coating device for applying a lubricant to a metal strip coated with a resin film on at least one side, The laminate metal band is brought into contact with one or more heating rolls before the process and heated, and the laminate metal band is heated with an electric heater after the heating process, and a far infrared heater is used as the electric heater. Heating method for laminated metal strip.
[0015]
(2) Measure the temperature (T2) of the laminated metal strip with a thermometer, and adjust the heating amount of the laminated metal strip by the heating roll and / or electric heater so as to eliminate the deviation from the target temperature (T1). The method for heating a laminated metal strip according to (1), which is characterized in that
[0017]
(3) The above (1) or (2), wherein the electric heater is composed of a plurality of heating bodies arranged along the laminated metal band width direction, and individually controls the heating output by each heating body. The method for heating a laminated metal strip according to claim 1.
[0018]
(4) The above (1) to (1), wherein a shielding plate is installed between the electric heater and the laminate metal strip, and the amount of radiant heat transferred from the electric heater to the laminate metal strip is adjusted by the opening of the shield plate. (3) The method for heating a laminated metal strip according to any one of the above.
[0019]
(5) A heating device for a laminated metal strip disposed on the entrance side of a lubricant coating device for applying a lubricant to a metal plate coated with a resin film on at least one side, and contacting the laminated metal strip One or more heating rolls for heating the laminated metal band, an electric heater for heating the laminated metal band on the downstream side in the line direction of the heating roll, and between the electric heater and the laminated metal band An opening-adjustable shielding plate, a heating device outlet thermometer for measuring the temperature (T2) of the laminated metal strip after heating, and the heating amount by the heating roll and / or the electric heater And a control device for adjusting , and the electric heater is a far-infrared heater .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a method and apparatus for heating a laminated metal strip according to the present invention.
[0021]
The laminating metal band heating device shown in FIG. 1 has three heating rolls 2 in which the inside for heating the laminating metal band 1 is heated with warm water by contacting the laminating metal band 1 from the upstream side in the line direction, A non-contact type electric heater 8 for heating the laminated metal strip 1 provided on the downstream side thereof, a shielding plate 9 having an adjustable opening degree installed between the electric heater 8 and the laminated metal strip 1, It consists of a heating device outlet thermometer 5 for measuring the temperature of the laminated metal strip and a control device 7 for adjusting the heating amount by the heating roll 2 and / or the electric heater 8.
[0022]
In the present embodiment, the roll 2 adjusts the flow rate of the hot water by the flow rate adjusting valve 3, but the temperature of the hot water may be adjusted. Furthermore, the heating amount of the roll 2 is not limited to a heating method using hot water or the like inside, and the heating amount may be adjusted by increasing or decreasing the contact area of the roll with the steel strip, electric heating inside the roll, steam inside the roll, or the steel strip.
[0023]
The heating device outlet-side thermometer 5 is a second thermometer for measuring the temperature (T2) of the laminated metal strip 1 after heating, and may be installed downstream of the electric heater 8 or a heating roll. 2 may be installed downstream of the heating roll 2 and downstream of the electric heater 8. A heating device inlet side thermometer 4 which is a first thermometer for measuring the temperature of the laminated metal strip 1 before heating is also often installed.
[0024]
The control device 7 outputs a width (W), thickness (t), transport speed (V), specific heat (Cp), density (ρ) of the laminated metal strip 1 that is an output signal from another control device 6. ), The opening of the heating roll flow rate adjusting valve 3 and the shielding plate using the heating temperature target value (T1) and the like and the temperature signal from the heating device outlet side thermometer 5 and / or the heating device inlet side thermometer 4 9 is used to control the opening degree. However, the heating amount of either the heating roll 2 or the electric heater 8 may be adjusted.
[0025]
The non-contact type electric heater 8 is preferably an infrared heater, particularly a far infrared heater. This is because a normal electric heater has ultraviolet rays in its light beam, and the resin film covering the surface of the laminated metal strip may be altered by the ultraviolet rays. The electric heater 8 is composed of a plurality of heating elements arranged along the laminating metal band width direction so as to uniformly heat the laminating metal band width direction. It is preferable to control them individually. FIG. 2 shows an example in which the electric heater 8 is composed of a plurality of heating elements arranged along the laminated metal band width direction.
[0026]
The shielding plate 9 is installed between the non-contact type electric heater 8 and the laminated metal strip 1, and is roughly similar to a blind curtain installed on a window. The amount of radiant heat transfer is increased or decreased. However, it is not limited to an adjustable one similar to a blind curtain, but there are some that can be fully closed and fully opened.
[0027]
Next, the operation and action of the laminated metal band heating device of the above embodiment will be described.
[0028]
As shown in FIG. 1, in the previous stage of the heating step, the laminated metal strip 1 is heated by contacting three heating rolls 2 whose inside is heated with warm water and the inner and outer surfaces of the laminated metal strip 1. At this time, the inside of the roll 2 is heated with hot water of 100 ° C. or less. In the latter stage of the heating process, the laminated metal strip 1 is heated by the electric heater 8. The laminated metal strip 1 is heated to an appropriate target temperature (T1) in a range where the lubricant does not solidify and the resin crystallinity of the resin does not become too small at the time of applying the lubricant or after applying the lubricant.
[0029]
The temperature (T2) of the laminated metal strip 1 is measured by the heating device outlet side thermometer 5 for measuring the temperature (T2) of the laminated metal strip 1 after heating so as to eliminate the deviation from the target temperature (T1). Then, the heating amount of the laminated metal band by the heating roll 2 and / or the electric heater 8 is adjusted. The method of adjusting the heating amount of the heating roll is as described above. However, as the method of adjusting the heating amount of the electric heater, a shielding plate 9 is installed between the electric heater 8 and the laminated metal strip 1 and this shielding is performed. There are a method of adjusting the amount of radiant heat transfer from the electric heater 8 to the laminated metal strip 1 by the opening of the plate 9, or a method of adjusting the surface temperature of the electric heater 8 although the response is poor.
[0030]
Furthermore, as a countermeasure when the laminating metal band heating device generates a device trouble, the heating roll has a function of separating the roll from the plate line, and the shielding plate has a function of fully closing or fully opening the shielding plate. It is preferable to have.
[0031]
【Example】
Using the apparatus shown in FIG. 1, the laminated metal band was heated on the inlet side of the lubricant (wax) coating device of the laminated metal band with a resin film under the use conditions shown in Table 1 by the method of the present invention and the comparative method. Here, as shown in FIG. 2, the electric heater is composed of four heating bodies arranged along the laminating metal band width direction in order to uniformly heat the laminating metal band width direction. Output is controlled individually. That is, in the example of the present invention, the laminated metal strip was heated to about 75-80 ° C. with a heating roll, and then heated to about 80-85 ° C. with a far infrared heater. Thereafter, the lubricant was applied with a lubricant (wax) coating device, and the wax unevenness on the surface of the laminated metal strip was visually evaluated. The results are shown in Table 2 together with the average value of the outputs of the four heating elements, the shielding plate opening, and the laminated metal band speed.
[0032]
Further, as a comparative example, the laminated metal strip was heated to about 75-80 ° C. with a heating roll, and then only passed through the metal strip without being heated by a far infrared heater. Thereafter, the lubricant was applied with a lubricant (wax) coating device, and the wax unevenness on the surface of the laminated metal strip was visually evaluated. The results are shown in Table 2 together with the laminated metal band speed.
[0033]
According to Table 2, in the comparative example, the wax unevenness occurred at both the laminating metal band speeds of 250 mpm and 300 mpm, whereas in the example of the present invention, the wax unevenness was at both the laminating metal band speeds of 250 mpm and 300 mpm. It can be seen that by applying the heating according to the method of the present invention, the lubricant is applied to the laminated metal strip to a more uniform film thickness, and there is no decrease in yield due to the occurrence of wax unevenness.
[0034]
[Table 1]

[0035]
[Table 2]

[0036]
【The invention's effect】
According to the present invention, since the laminated metal strip can be heated to a predetermined temperature uniformly in the sheet width direction by precise temperature control, the lubricant can be uniformly applied to the surface. As a result, product quality and yield can be improved.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of a method and apparatus for heating a laminated metal strip according to the present invention. FIG. 2 shows a plurality of heating elements in which the electric heater of the present invention is arranged along the width direction of the laminated metal strip. FIG. 3 is an explanatory diagram showing an example of what is to be achieved. FIG. 3 is a conventional method of heating a laminated metal strip (hot water roll method: no control)
[Fig. 4] Conventional laminated metal band heating device (hot water roll method: hot water flow rate control)
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Laminated metal belt 2 Heating (warm water) roll 3 Flow control valve for heating rolls 4 Heating device inlet side thermometer 5 Heating device outlet side thermometer 6 Controller 7 Controller 8 Non-contact type electric heater 9 Shielding plate

Claims (5)

A method of heating a laminated metal strip to a target temperature (T1) on the entry side of a lubricant coating device for applying a lubricant to a metal strip coated with a resin film on at least one side, the stage before the heating step Then, the laminated metal band is heated by bringing the laminated metal band into contact with one or more heating rolls, and the laminated metal band is heated with an electric heater after the heating step, and a far infrared heater is used as the electric heater. Heating method. The temperature (T2) of the laminated metal strip is measured by a thermometer, and the amount of heating of the laminated metal strip by the heating roll and / or electric heater is adjusted so as to eliminate the deviation from the target temperature (T1). The method for heating a laminated metal strip according to claim 1. The laminated metal strip according to claim 1 or 2, wherein the electric heater is composed of a plurality of heating bodies arranged along the width direction of the laminated metal strip, and the heating output by each heating body is individually controlled. Heating method. 4. A shield plate is installed between the electric heater and the laminate metal strip, and the amount of radiant heat transferred from the electric heater to the laminate metal strip is adjusted by the opening of the shield plate. The method for heating a laminated metal strip according to claim 1. A heating device for a laminated metal strip disposed on the entry side of a lubricant application device for applying a lubricant to a metal plate coated with a resin film on at least one side, wherein the laminated metal strip is brought into contact with the heating device. One or more heating rolls for heating the laminated metal band, an electric heater for heating the laminated metal band on the downstream side in the line direction of the heating roll, and installed between the electric heater and the laminated metal band In order to adjust the amount of heating by the heating roll and / or the electric heater, a shield plate with adjustable opening, a heating device outlet thermometer for measuring the temperature (T2) of the laminated metal strip after heating And a heating device for the laminated metal strip, wherein the electric heater is a far infrared heater.

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