JP3493734B2 - Web sheet dip coating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various kinds of synthesis of a long metal thin plate used as a processing material for a metal etching part such as a shadow mask and a flexible wiring board. A web for applying a resin liquid such as a photosensitive resin liquid or a coating liquid to a long web sheet (a long sheet) such as a long synthetic resin flexible sheet used as a processing material of a resin sheet part. The present invention relates to a sheet dip coating apparatus. [0002] When metal etching parts such as shadow masks and lead frames, and various sheet processing parts such as flexible wiring boards are manufactured by a photo-etching method,
First, there is a step of uniformly applying a photosensitive resin to both surfaces of a thin metal plate such as a steel plate, a nickel alloy steel plate, and a copper plate, or a synthetic resin flexible sheet material. As a method of uniformly applying a photosensitive resin liquid to the above-mentioned material, conventionally, a web sheet (long sheet) material is immersed in a coating liquid, and then is immersed at a predetermined interval set near the coating liquid surface. A method of obtaining a uniform coating film of a predetermined thickness on both surfaces of the material by sandwiching between a pair of opposed fixed application rolls and pulling up the material from between the opposed application rolls is adopted. Is appropriately adjusted so that the thickness of the coating film can be adjusted to some extent. However, in the dip coating method described above, dust or foreign matter is apt to be mixed in the coating liquid, and bubbles are easily generated in the coating liquid during replenishment of the coating liquid. When the material is immersed in the coating solution, air bubbles are likely to be generated on the surface of the material, and in the case of a viscous coating solution, the new solution and the old solution, which replenish the consumption of the coating solution, are difficult to mix uniformly. There is a problem. An object of the present invention is to eliminate the above disadvantages. According to the present invention, there is provided a first tank 1 for storing a coating liquid a, and a rotatably pivoted support in the first tank 1 downward.
Then, the web sheet w carried into the coating liquid a in the first tank is
A horizontal main guide roll 2 for guiding, a second tank 5 installed above the first tank, a slit hole 6 formed in the bottom 5 a of the second tank 5, and a side opposed to the slit hole 6. respectively fixed to the squeegee plate 7, 7 a pair of opposed, such as to close the slit 6, the coating slit portion 8 above the slit 6 of the second tank 5, and the slit 6 coating
Between the slit portion 8 and the web sheet w in the width direction.
Stirring with a defoaming stirring plate 9 that moves repeatedly
And a device 16, the web sheet w was carried into the first tank 1 in the coating solution in a by guides on the main guide roll 2, the introduction and defoaming to between squeegee plate 7,7 of the second vessel 5 Use
While removing bubbles and the like by the repetitive moving operation of the stirring plate 9,
Introduced to the coating slit section 8 and the second
The web sheet dip coating apparatus is characterized in that a coating liquid a in a tank 5 is coated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A web sheet dip coating apparatus according to one embodiment of the present invention will be described in detail below with reference to the side view of the apparatus shown in FIG. 1 and the front view of the apparatus shown in FIG. The first tank 1 is a storage tank for storing a coating liquid a (for example, a photosensitive resin liquid such as a photoresist for pattern etching) for applying to both surfaces of the web sheet w (material). One side of the upper end of one tank 1 has a coating solution a
Is provided with a drain pipe 4 for overflowing, and when the coating liquid a supplied by the supply pipe 14 is supplied into the tank on the other side, air bubbles and dust mixed in the coating liquid a are removed. A filter unit 15 (mesh filter) for cleaning is provided. The level b of the coating liquid a stored in the first tank 1 is set to the level of the coating liquid a overflowing from the drain pipe 4. The main guide roll 2 is freely rotated in a horizontal state at the support shaft 2a, on the side wall of the first tank 1, or on the support arm 3 (see FIG. 2) immersed in the first tank 1. It is rotatably supported by an electric motor (not shown). The support arm 3 is disposed on both sides or one side (not shown) in the first tank 1 as shown in FIG. 2, and a main guide roll 2 is pivotally supported at a lower end of the support arm 3. Upper end of the upper part of the first tank 1 (omitted view)
May be attached and fixed to the first tank 1, or may be attached to and supported by the first tank 1 via a fulcrum (support shaft) so as to be able to swing. The second tank 5 is smaller than the first tank 1 and is mounted and fixed above the first tank 1.
The bottom portion 5a is provided with a slit hole 6 through which the web sheet w is inserted. The first tank 1 and the second tank 5 communicate with each other through the slit hole 6, and the second tank 5 The liquid level b of the stored coating liquid a is the same as the liquid level b of the first tank 1. The width and length of the slit hole 6 are set to be large enough to insert a web sheet w having a predetermined width and thickness. As shown in FIG. 1, each of the slit holes 6 is made of a flexible and elastic material (restoration) made of rubber or synthetic resin.
And a pair of squeegee plates 7, 7 having sufficient hardness to prevent the surface of the web sheet w from being scratched, are attached to the opposing sides 6a, 6a of the slit hole 6 with their ends abutting each other. The ends of the squeegee plates 7 and 7 are abutted with each other to form a slit hole 6.
Of the slit hole 6
Is almost in a state of blocking. In addition, the squeegee plates 7, 7 are arranged such that the butted ends of the squeegee plates 7, 7 are opposite sides 6a,
It may be abutted in a state of projecting upward in an inverted V-shape from the mounting portion of 6a, or may be abutted in a horizontal state. The coating slit portion 8 is disposed above the slit hole 6 so as to be horizontal in the second tank 5 and to enter a plane passing through a portion corresponding to the slit hole 6. It is attached to and supported by the upper ends of both side walls of the tank 5. As shown in FIG. 1, the coating slit section 8 has a predetermined gap through which the web sheet w is inserted.
A pair of cylindrical or elliptical coating rolls 8a and 8b attached parallel and opposed to each other, or a pair of semi-cylindrical shapes attached parallel and opposed to each other with a predetermined gap (not shown). Non-cylindrical coating liner and the like. The coating slit section 8 is mounted and supported on the upper end of the opposite side wall of the second tank 5, and is used in a fixed state without rotating at least in normal use. In addition, the opposing gap is appropriately formed by being mounted and supported by a rotary bearing, an eccentric bearing, or another mounting support method in the mounting support portion of the coating rolls 8a, 8b or the coating liner to the second tank 5. It is possible to change and adjust, and thereby, it is possible to adjust the coating film thickness of the coating liquid a. As shown in FIG. 1, the web sheet dip coating apparatus of the present invention, as shown in FIG. The guide (or the intermediate opposing roll 10 is driven and rotated in the carry-in direction to infeed) by the roll 10 (or the intermediate one-sided roll), is wound around the main guide roll 2 by half a turn, and is guided in the turning direction. It is introduced between the rubber squeegee plates 7,7. The squeegee 7,
7, while removing air bubbles and the like adhering to both sides of the web sheet w, the web sheet w is carried into the second tank 5, and subsequently adjusted in consideration of the thickness and the coating film thickness of the web sheet w in the coating slit portion 8. The coating liquid a in the second tank 5 is applied to the web sheet w after being introduced into the predetermined gap. From the filter section 15 provided at the upper end of the web sheet dip coating apparatus, the coating liquid a supplied from the supply pipe 14 is not cleaned, but is always or periodically injected into the second tank 5. Then, the overflowing coating liquid a is discharged from the drain pipe 4 provided at the upper end of the first tank 1. Next, another embodiment of the web sheet dip coating apparatus of the present invention will be described in detail with reference to the side view of FIG. 1 and the front view of FIG. In another embodiment, the agitating device 16 for gently stirring the coating liquid a in the second tank 5 is provided in the web sheet dip coating device of the above-described one embodiment. As shown in FIGS. 1 and 2, the stirrer 16 has a stirrer plate 9 of a predetermined shape immersed in the second tank 5, and the upper end 9a of the stirrer plate 9 moves linearly and repeatedly. It is attached to and supported by the oscillating means 17 that operates. The oscillating means 17 is a linear repetitive moving operation by an air cylinder, or a linear motion by converting a rotary motion of an electric motor or the like into a linear motion by a rack and pinion, a cam and cam follower, a crank or the like. It performs a repetitive moving operation. The oscillating means 17 shown in FIGS. 1 and 2 is, for example, a rodless air cylinder, and includes a linear guide shaft 18a and an operating air supply pipe 19 for driving a cylinder attached to both ends of the linear guide shaft 18a. ,
19 and a movable block 18b capable of linearly and repeatedly moving along the linear guide shaft 18a, and the stirring plate 9 is mounted and supported on the movable block 18b. FIG. 3 shows a coating liquid a relating to the above-mentioned apparatus of the present invention.
FIG. 3 is a block diagram showing an outline of a circulation system of
The filter 12 (mesh filter, etc.) and the flow control valve 13 are supplied from a replenishing tank 11 filled and held with a coating liquid a, which is installed above the web sheet dip coating apparatus of the present invention.
(Electromagnetic solenoid valve, motor drive valve, etc. for stopping and starting replenishment of the coating liquid a and adjusting the replenishment flow rate) are supplied into the second tank 5 from the replenishing pipe 14 by a natural flow method or a liquid feeding pump (not shown). )). The coating liquid a which has overflowed from the upper end of the second tank 5 due to the replenishment is once discharged into the first tank 1, and the coating liquid a which has overflowed from the upper end of the first tank 1 through the drain pipe 4 is Is collected in the collection tank 20. The recovered coating solution a ₁ recovered in the recovery tank 20
Is supplied by a forced supply method using a liquid supply pump 22 as appropriate, passes through supply pipes 21, 23, 25 and a filter 24 (mesh filter or the like) therebetween, and is supplied into the supply tank 11. Circulate. In the web sheet dip coating apparatus of the present invention, the main guide roll 2 is provided below the first tank 1, and the slit 5 is provided in the bottom 5a of the second tank 5 installed above. Since a pair of opposed squeegee plates 7 and 7 are provided in the slit hole 6 and the coating slit portion 8 is provided above the slit hole 6, the web sheet carried into the coating liquid a in the first tank 1. w is guided by the main guide roll 2 and the second
When the squeegee plates 7 are introduced into the tank 5 between the butted squeegee plates 7, the web sheet w is
Air bubbles and the like adhering to both sides of the web sheet w can be removed.
Coating. Further, the above-mentioned web sheet dip coating apparatus comprises:
The coating liquid a in the second tank 5 can be agitated at an appropriate time by the agitating plate 9 of the agitating device 16 which includes the agitating device 16 and linearly and repeatedly moves in the width direction of the web sheet w. In a case where a relatively viscous coating liquid a is used for coating, the consumption of the coating liquid a is replenished by gently stirring the coating liquid a so as not to generate new air bubbles. A new liquid (for example, a coating liquid whose concentration (viscosity) or composition has changed due to use and replenished by regenerating to a predetermined concentration (viscosity) or composition) and an old liquid (for example, a coating liquid in use, or Uniform mixing with the coating liquid (concentration (viscosity) or composition changed by use) can be improved, and defoaming of the coating liquid a in which bubbles are generated can be promoted. The web sheet dip coating apparatus of the present invention is
In the dip coating method in which the web sheet material is immersed in the coating liquid and the coating liquid is applied, the coating operation can be performed so that the air bubbles generated during the replenishment of the coating liquid do not adhere to the surface of the web sheet material, and the air bubbles adhere to the coating film. Thus, it is possible to prevent the occurrence of pinhole-shaped coating unevenness and perform a uniform coating operation. In addition, the stirring operation enables uniform stirring of the new solution and the old solution having different concentrations (or viscosities) and compositions, so that the concentration of the coating solution including the viscous coating solution (or (Viscosity) and a difference in composition, thereby preventing the occurrence of uneven coating film thickness and uneven coating film performance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view illustrating a web sheet dip coating apparatus of the present invention. FIG. 2 is a front view illustrating a web sheet dip coating apparatus of the present invention. FIG. 3 is a schematic block diagram illustrating a coating liquid circulation system of the web sheet dip coating apparatus of the present invention. [Description of Signs] a: coating liquid a ₁ : recovered coating liquid w: web sheet 1: first tank 2 ... main guide roll 3 ... support arm 4 ... drain tube 5 ... second tank 5 a ... bottom 6 ... slit hole 7 ... Squeegee plate 8 ... Slit plate 9 ... Stirring plate 10 ... Intermediate opposing roll 11 ... Supply tank 12 ... Filter unit 13 ... Flow control valve 14 ... Supply tube 15 ... Filter unit 16 ... Stirring device
17: stirring means

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Claims (1)

(57) [Claim 1] A first tank 1 for storing a coating liquid a, and the first tank
1 is rotatably supported inward and downward, and within the coating liquid a of the first tank.
A horizontal main guide roll 2 for guiding the carried-in web sheet w, and a second tank 5 installed above the first tank
And a slit hole 6 formed in the bottom 5a of the second tank 5;
A pair of opposing squeegee plates 7, 7 fixed to opposing sides of the slit hole 6 and closing the slit hole 6, respectively.
And a coating slit portion 8 above the slit hole 6 in the second tank 5, and between the slit hole 6 and the coating slit portion 8.
Detachment that moves repeatedly linearly in the width direction of the web sheet w
A stirrer 16 to which a foam stir plate 9 is attached; a web guide w carried into the coating solution a in the first tank 1 is guided by the main guide roll 2 to form a squeegee in the second tank 5;
Introducing between the plates 7 and 7 and repetitive movement of the defoaming stirring plate 9
To the application slit section 8 while removing air bubbles and the like.
And a web sheet w is coated with the coating liquid a in the second tank 5.