JPH067725A - Method and apparatus for coating resist film on face of continuous thin metal sheet - Google Patents

Abstract

PURPOSE:To form simply and without working load resist films with an arbitrary film thickness and being uniform and stable on each of both main faces of a thin metal sheet by improving a coating apparatus using a mere bar. CONSTITUTION:After both main faces of a thin metal sheet 1 are coated with a resist liq., rolls 4 and 5 with grooves each with a doctor roll 6 or 7 are provided in such a way that they are brought into contact with both main faces of the thin metal sheet 1 in parallel in the transverse direction and the both main faces are coated at the same time each with an arbitrary film thickness by restricting the amt. of coating of the resist liq. 3 with which the both main faces are coated and controlling respectively the ratio of peripheral speed of the doctor roll 6 or 7 to the roll 4 or 5 with grooves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resist film for a continuous metal thin plate in a process of manufacturing a metal thin plate product which is produced by chemically etching a predetermined pattern on a metal thin plate represented by a shadow mask and a lead frame. The present invention relates to improvement of a coating method and apparatus.

[0002]

2. Description of the Related Art A resist film is generally applied to a continuous thin metal plate in a manufacturing process of a thin metal plate product which is produced by chemically etching a predetermined pattern on a thin metal plate represented by a shadow mask or a lead frame. Since coating is used, it is not possible to easily change the film thickness, and in this method, it is difficult to form an arbitrary film thickness on each of the two main surfaces of the metal thin plate.

In the above dip coating, squeeze rolls, slits, etc. are arranged on the liquid surface of the resist liquid dipping tank, and the resist liquid applied to the metal thin plate is squeezed through a metal thin plate between the rollers or in the slit. Thus, although a film thickness control device is known (for example, Japanese Utility Model Publication No. 62-23575), there has been a problem that the film thickness fluctuates due to the vibration of the thin metal plate.

By the way, it is generally known to use a mill bar as a method for mechanically controlling the thickness of a film to be coated. However, when the viscosity of the resist material becomes high and the coating speed becomes fast, the thickness of the bar is reduced. The coating unevenness due to the wire was likely to occur, and it was not possible to easily parallelize the bar to both main surfaces of the metal thin plate.

In such a situation, the present inventor proposes a method and an apparatus for applying a resist film having an arbitrary film thickness and a uniform film thickness to both main surfaces of a metal thin plate by using a doctor bar attached thereto. (Japanese Patent Application No. 2-50752).

In this method and apparatus, the film thickness is controlled by changing the wire diameter of the bar, and the uniformity of the film thickness is controlled by adjusting the parallelism and the position of the bar.

[0007]

As described above, when a uniform and stable resist film having an arbitrary film thickness is simultaneously formed on each of both main surfaces of a metal thin plate by using a doctor bar attached with a doctor, the film thickness To change the, it is necessary to change the wire diameter of the Miyabar. However, replacing the mill bar requires a work load and also requires stopping the coating device.

Further, when using the miya bar, the larger the diameter of the roll around which the wire is wound is more desirable in terms of the mechanical accuracy of the apparatus. However, the larger the diameter of the roll around which the wire is wound, the more difficult the winding work becomes. Microscopically, there are variations in the longitudinal direction, and therefore the precision of the mill bar cannot be very high. for that reason,
It is difficult to control the precision of the applied film thickness more precisely.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the coating device using a mill bar so that both main surfaces of a metal sheet can be easily operated without any work load. To provide a resist film coating method and apparatus capable of simultaneously forming a uniform and stable resist film with a uniform film thickness.

[0010]

A method for applying a resist film on a surface of a continuous thin metal plate according to the present invention which achieves the above object, is a method for manufacturing a thin metal plate product which is produced by chemically etching a predetermined pattern on a thin metal plate. The method is to apply a resist film to both main surfaces of a continuous thin metal plate, and after applying the resist solution to both main surfaces, attach a doctor so as to contact the main surfaces of the thin metal plate in parallel to the transverse direction. In this method, a grooved roll is arranged, and the resist film is applied by regulating the application amount of the resist solution applied to both main surfaces.

In this case, one or more of the peripheral speed ratio of the doctor roll with respect to the grooved roll, the peripheral speed of the grooved roll with respect to the feeding speed of the thin metal plate, or the interval between the grooved roll and the doctor roll should be controlled. With this, it is possible to simultaneously apply an arbitrary film thickness to each of both main surfaces of the thin metal plate.

Further, another method of applying a resist film on the surface of a continuous thin metal plate of the present invention is a method for producing a thin metal plate product, which is produced by chemically etching a predetermined pattern on the thin metal plate. A method of applying a resist film on the main surface, which comprises applying a resist solution on both main surfaces, and then arranging a bar with a doctor roll attached so as to be in parallel with the transverse direction of both main surfaces of the metal thin plate, And, the peripheral speed ratio of the doctor roll to the miya bar, the peripheral speed of the miya bar to the feed speed of the metal sheet,
Alternatively, by controlling any one or more of the intervals between the mill bar and the doctor roll, the coating amount of the resist liquid applied to each of the both main surfaces is regulated so that the coating is performed at an arbitrary film thickness at the same time. It is a method characterized by doing.

[0013]

In the present invention, a grooved roll with a doctor roll is disposed so as to be in parallel contact with both main surfaces of the metal thin plate in parallel with each other, and the coating amount of the resist solution applied to both main surfaces is set. Since the resist film is regulated and applied, the resist solution on the grooved roll is smoothed by the doctor roll, and a uniform resist film can be applied, as in the case of using the mill bar, and the viscosity of the applied resist solution Also, even if the coating speed is changed, coating unevenness does not occur in the coating film, and a uniform resist film is coated on both main surfaces.

Moreover, since a grooved roll with high precision can be constructed more easily than the mill bar, its coating precision is further improved. Then, by controlling only one or more of the peripheral speed ratio of the doctor roll with respect to the grooved roll, the peripheral speed of the grooved roll with respect to the feed rate of the thin metal plate, or the interval between the grooved roll and the doctor roll, the resist solution It is possible to easily apply a desired film thickness to each of both main surfaces of the metal thin plate at the same time without requiring time-consuming work such as viscosity adjustment. In addition,
This film thickness control can also be applied to the case of using a miya bar.

The present invention also includes an apparatus for carrying out these methods.

[0016]

The method and apparatus for applying a resist film on the surface of a continuous thin metal plate of the present invention will be described with reference to the drawings. Figure 1
FIG. 1 is a schematic side view of an apparatus for carrying out the film coating method of the present invention, in which a thin metal plate 1 is dipped in a resist solution dipping tank 2 and resist solution 3 is applied to both main surfaces thereof, and then grooved rolls 4 and 5 are used. Are contacted in parallel with the transverse direction of both main surfaces of the metal thin plate 1 to regulate the coating amount of the resist solution 3. At this time, the doctor rolls 6 and 7 are brought into contact with the respective surfaces of the grooved rolls 4 and 5 to smooth the resist solution adhering to the surfaces of the grooved rolls 4 and 5, thereby to obtain the viscosity of the resist solution 3 and Even if the coating speed is changed, a uniform resist film is formed on the thin metal plate 1 without causing uneven coating of the coating film in which the coating amount on both main surfaces is regulated. If the coating amount is regulated only by the grooved rolls 4 and 5 without using the doctor rolls 6 and 7,
The thickness of the resist film applied to both main surfaces of the metal thin plate 1 varies in the transverse direction, and it cannot be used as a resist film.

By the way, the grooved rolls 4 and 5 have a pitch of, for example, 1 mm in the circumferential direction around the roll 10 (the width of the groove 11 is 0.5 m, as shown in the partial cross section of FIG. 2).
m) and a groove 11 having a depth of, for example, about 0.2 mm is provided.
Acts to regulate the amount of coating. Moreover, unlike the bar, the grooved rolls 4 and 5 can be easily manufactured while maintaining the accuracy of the groove 11 high even if the diameter is increased from the viewpoint of mechanical accuracy. The accuracy of the thickness distribution can be controlled more precisely.

Conventionally, the thickness of the coating film is controlled by changing the diameter of the wire of the mill bar to control the thickness of the coating on each of the two main surfaces of the metal thin plate. However, in the present invention, By controlling the peripheral speed ratio of the doctor rolls 6 and 7 with respect to the grooved rolls 4 and 5, the coating film thickness can be arbitrarily controlled.

FIG. 3 shows the actual measurement results when the peripheral speed ratio of the doctor rolls 6, 7 with respect to the peripheral speed of the grooved rolls 4, 5 is changed. Obviously, the peripheral speed ratio should be changed. It can be seen that the coating film thickness can be controlled by. Although FIG. 3 shows the case where the doctor rolls 6 and 7 and the grooved rolls 4 and 5 rotate in the opposite directions (together with each other), the same control can be performed when both rotate in the same direction.

As described above, by changing the peripheral speed ratio, the film thickness of the resist film applied on the thin metal plate 1 is changed because the surfaces of the doctor rolls 6 and 7 are grooved rolls 4 and 5. It is considered that the ratio of the amount of resist distributed to the two when they are separated from the grooved surface is different depending on the speed difference between the two. FIG. 4 shows how the coating amount is regulated by the resist coating amount regulating portion including the grooved roll a and the doctor roll b. The resist solution 3 transferred from the metal thin plate 1 to the grooved roll a is partially distributed to the doctor roll b, the resist solution 3 is removed by the doctor blade c, and drops onto the resist solution receiving pan d.

The film thickness of the resist film to be applied not only changes the peripheral speed ratio of the doctor roll b to the peripheral speed of the grooved roll a, but also the speed of the grooved roll a with respect to the metal thin plate 1 and the grooved roll. It can also be changed by changing the gap between a and the doctor roll b.

By the way, in such a film thickness control, instead of the grooved rolls 4 and 5, the conventional method (Japanese Patent Application No. 2-50752) is used.
No.), it can also be applied to the case of using a mill bar, without changing the wire diameter of the mill bar, doctor roll 6,
The film thickness to be applied to each of both main surfaces of the metal thin plate 1 can be arbitrarily controlled only by changing the peripheral speed ratio of 7.

As described above, the metal thin plate 1 whose resist coating film thickness is controlled is then dried in the drying unit 8 by a far infrared heater, air blow, etc.
No. 50752, the film thickness and film thickness distribution are measured, and the grooved rolls 4, 5 are based on the measured data.
The parallelism with respect to the main surface of the metal thin plate 1 and the gap are automatically adjusted. Note that this configuration is not always necessary.

In the above embodiments, the dip coating method using the dip tank 2 is adopted for the first application of the resist solution 3 to the metal thin film 1, but other known coating methods are adopted. It will be clear that it is okay.

[0025]

As is apparent from the above description, according to the method and apparatus for coating a resist film on the surface of a continuous thin metal plate of the present invention, a doctor roll is contacted so as to be in contact with both major surfaces of the thin metal plate in parallel with each other. With the attached grooved rolls, the resist film is applied by controlling the amount of resist liquid applied to both main surfaces, so as with the case of using a mill bar, the grooved rolls can be used with a doctor roll. The above resist solution is smoothed, a uniform resist film can be applied, and even if the viscosity and application speed of the applied resist solution change,
A uniform resist film is applied to both main surfaces without causing coating unevenness.

In addition, since the grooved roll with high precision can be constructed more easily than the mill bar, the coating precision is further improved. Then, by controlling only one or more of the peripheral speed ratio of the doctor roll with respect to the grooved roll, the peripheral speed of the grooved roll with respect to the feed rate of the thin metal plate, or the interval between the grooved roll and the doctor roll, the resist solution It is possible to easily apply a desired film thickness to each of both main surfaces of the metal thin plate at the same time without requiring time-consuming work such as viscosity adjustment. In addition,
This film thickness control can also be applied to the case of using a miya bar.

[Brief description of drawings]

FIG. 1 is a schematic side view of an apparatus for carrying out a film coating method of the present invention.

FIG. 2 is a partial cross-sectional view of a grooved roll.

FIG. 3 is a diagram showing an actual measurement result when a peripheral speed ratio of a doctor roll to a grooved roll is changed.

FIG. 4 is a diagram showing how the resist coating amount is regulated by a resist coating amount regulating unit including a grooved roll and a doctor roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal thin plate 2 ... Resist liquid dipping tank 3 ... Resist liquid 4, 5, a ... Roll with groove 6, 7, b ... Doctor roll 8 ... Drying unit 10 ... Roll 11 ... Groove c ... Doctor blade d ... Resist liquid receiver Bread

Claims (5)

[Claims] 1. A method for applying a resist film to both main surfaces of a continuous metal thin plate in a manufacturing process of a metal thin plate product which is manufactured by chemically etching a predetermined pattern on a metal thin plate, wherein the resist is applied to both main surfaces. After applying the liquid, a grooved roll with a doctor roll is placed so that it is in contact with both main surfaces of the thin metal plate in parallel to the transverse direction, and the amount of resist liquid applied on both main surfaces is regulated. A method for applying a resist film to a surface of a continuous thin metal plate, which comprises applying a resist film by applying the resist film. 2. A peripheral speed ratio of the doctor roll with respect to the grooved roll, a peripheral speed of the grooved roll with respect to a feed rate of a thin metal plate, or a gap between the grooved roll and the doctor roll. 2. The method for coating a resist film on a surface of a continuous thin metal plate according to claim 1, wherein both main surfaces of the thin metal plate are simultaneously coated with an arbitrary film thickness by controlling the above. 3. A method of coating a resist film on both main surfaces of a continuous metal thin plate in a manufacturing process of a metal thin plate product which is manufactured by chemically etching a predetermined pattern on a metal thin plate, wherein the resist is applied to both main surfaces. After applying the liquid, arrange a bar with a doctor roll attached so as to be in parallel contact with the transverse directions of both main surfaces of the metal sheet, and the peripheral speed ratio of the doctor roll to the bar, the feed rate of the metal sheet. By controlling at least one of the peripheral speed of the mill bar or the interval between the mill bar and the doctor roll, the coating amount of the resist solution coated on each of the two main surfaces is regulated to an arbitrary film. A method for coating a resist film on a continuous thin metal plate surface, characterized in that the coating is carried out simultaneously in a thick manner. 4. An apparatus for applying a resist film to both main surfaces of a continuous metal thin plate in a manufacturing process of a metal thin plate product which is produced by chemically etching a predetermined pattern on a metal thin plate, wherein the resist is applied to both main surfaces. Means for applying the liquid,
Two grooved rolls with attached doctor rolls arranged so as to contact in parallel to the transverse directions of both main surfaces of a metal thin plate having the resist liquid applied on both main surfaces, and a resist film regulated by the grooved rolls And means for drying the
Apply a uniform resist film by smoothing the resist solution on the grooved roll with the doctor roll,
And, any one or more of the peripheral speed ratio of the doctor roll with respect to the grooved roll, the peripheral speed of the grooved roll with respect to the feeding speed of the thin metal plate, or the interval between the grooved roll and the doctor roll is controlled. Thus, the resist film coating apparatus is characterized in that it is configured such that an arbitrary film thickness can be simultaneously applied to both main surfaces of the thin metal plate. 5. A device for coating a resist film on both main surfaces of a continuous metal thin plate in a manufacturing process of a metal thin plate product which is manufactured by chemically etching a predetermined pattern on a metal thin plate, wherein the resist is applied on both main surfaces. Means for applying the liquid,
Means for drying the resist film regulated by the miller bar, which has two doctor bars attached so as to be in contact with the two principal surfaces of the thin metal plate with the resist solution applied to the both principal faces in parallel with each other in the transverse direction Consisting of and applying a uniform resist film by smoothing the resist liquid on the bar with the doctor roll, and the peripheral speed ratio of the doctor roll to the bar, the feed rate of the metal sheet of the bar. By controlling at least one of the peripheral speed or the interval between the mill bar and the doctor roll, an arbitrary film thickness can be simultaneously applied to each of both main surfaces of the metal thin plate. Resist film coating device.