JP3254988B2 - Slot type fluid coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slot type fluid coating apparatus for applying a coating fluid on a surface of an object to be coated in a smooth state with a uniform thickness.

[0002]

2. Description of the Related Art In a conventional slot type fluid coating apparatus, as shown in FIG.
_The application fluid L (application material) discharged from the _S is separated from the discharge tip of the slot portion BS by a distance from the surface of the object W to be applied (the slot from the surface of the object W to be applied). Part B
While maintaining _S height) of the ejection tip of the predetermined value, so as to scrape excess coating material L is relatively moved to the coating object W in the direction of the arrow with respect to the slot portion B _S, the coating A uniform coating film (layer) having a predetermined value is formed on the object W.

The above-mentioned slot type fluid coating device is suitable for forming a coating film having a relatively large thickness. As such a fluid coating device, there is a curtain coater type fluid coating device. Fluid application is also performed by a screen printing device, a gravure coating device, or the like.

Moreover, in conventional slot type fluid coating apparatus, as shown in FIG. 4, the slot-type coating head B of the slot B _S from the discharged coating fluid L (coating material), the coating object W A semi-ball-shaped pool M of the coating material L called a bead is formed on the rear side with respect to the relative traveling direction of the coating material B (on the front side with respect to the relative traveling direction of the coating head B).

While maintaining the state of the accumulation of the pool M, the workpiece W is moved relative to the slot B _{S in the} direction of the arrow while maintaining the discharge tip of the slot B _S at the same height, thereby generating an excess. By scraping the coating material L, a uniform coating film of a predetermined value is formed on the workpiece W.

[0006]

However, the object W to be coated using the above-mentioned slot type fluid coating device is
As shown in the side views of FIGS. 5A and 5B, the surface is concave and convex due to a concave surface w1 and a convex surface w2 of the wiring pattern P, such as a printed circuit board having a wiring pattern P formed thereon. In the case of the workpiece W having
Is changed by the uneven surface, and the thickness of the applied film is delicately changed. Therefore, it is difficult to control the applied film to be applied uniformly and smoothly.

As shown in FIGS. 5 (a) and 5 (b), the surface LS of the object W to be applied using the above-mentioned slot type fluid application device has irregularities which were present before the application. An uneven surface having a similar shape to the surface is exhibited, and a smooth coated surface cannot be obtained.

On the other hand, in the curtain coater type fluid coating apparatus, it is difficult to control the coating range (area) on the object to be coated W by the curtain coater type coating head as compared with the slot type. In some cases, the coating material adheres to areas that should not be applied, and when the surface to be coated is an uneven surface, the coating film thickness is controlled uniformly, as in the case of the slot type fluid coating device. In addition, the coating surface of the object to be coated W presents an uneven surface having a substantially similar shape to the uneven surface before coating.

On the other hand, in the case of fluid application by a screen printing apparatus, the accuracy of the application thickness is inferior, and when the surface of the object to be applied is an uneven surface and the interval between the concave portions is narrow, the concave portions are not used. The coating material L cannot sufficiently enter the inside, and the coating material L is applied in a state of embracing bubbles in the concave portion.

In addition, since there is a limit to the thickness that can be applied at one time (the distance between the opposing screen surface and the object to be screen-printed; depending on the screen distance),
Depending on the coating thickness to be processed, it was necessary to apply twice or three times.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slot type fluid coating apparatus in which not only the surface to be coated is smooth but also the surface to be coated is smooth without unevenness. An object of the present invention is to make it possible to easily obtain a coating film having a suitable coating surface by one coating operation.

[0012]

Means for Solving the Problems A first invention of the present invention is:
A fluid extrusion device A that extrudes the application fluid L at a predetermined extrusion pressure, and discharges the application fluid L to the surface of the workpiece W in a width direction at a constant ejection amount corresponding to the extrusion pressure. A slot-type coating head B to be coated, and an object-to-be-placed that can move horizontally below the coating head B at a predetermined speed and can be shifted based on the unevenness of the surface in the width direction of the object to be coated W A table C and an elevating mechanism D for raising and lowering the slot type coating head B with respect to the substrate C to be coated; While passing under the coating head B,
A table-type fluid application device wherein the table C is controlled to decelerate.

Next, a second invention of the present invention is directed to a fluid extruder A for extruding the application fluid L at a predetermined extrusion pressure, and a method of applying the application fluid L at a constant discharge amount corresponding to the extrusion pressure. A slot-type coating head B that discharges and coats the surface of the workpiece W in the width direction, and a lower side of the coating head B that is horizontally movable at a predetermined speed and that is movable in the width direction of the workpiece W. Coating object mounting table C that can be shifted based on the surface unevenness
And an elevating mechanism D for raising and lowering the slot-type coating head B with respect to the workpiece mounting table C. The workpiece W is placed above the workpiece mounting table C.
A surface height displacement meter N for measuring the uneven surface shape of the object W. An area where a concave shape exists on the surface in the width direction of the object W based on the uneven surface shape data of the object W by the displacement meter N is provided. The slot type fluid application device is characterized in that a timing during passage under the application head B is detected, and the table C is decelerated based on the timing detection signal.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The slot type fluid application device of the present invention will be described in detail below according to embodiments.

FIG. 1 is a schematic side view of a slot type fluid applying apparatus according to the present invention, wherein A is an extruding apparatus for extruding a predetermined amount of application fluid L, B is a slot type applying head, and C is an application condition (application target). This is an object-loading table that can be shifted depending on the uneven surface shape of the object, the coating film thickness, etc.).

The extruder A includes a storage tank 1 for storing a coating fluid L, a discharge pipe 2 for discharging the fluid L from the storage tank 1, and a slot-type coating head for discharging the fluid L discharged from the discharge pipe 2. A pump 3 for pressure-feeding to the B side and a pressure-feeding supply pipe 4 for supplying a fluid L pumped by the pump 3 to the coating head B are provided.

The slot type coating head B is fixed at a fixed position, and has a slot B _S (discharged fluid L to be discharged) at its lower end portion for discharging the fluid L toward the surface of the workpiece W. (A T-die-shaped slit portion) for linear application in the width direction of the application object W.

The slot type coating head B has a head body block 11 made of metal, an introduction flow path 12 formed in the block 11 for introducing the fluid L fed from the pressure feed pipe 4, Fluid L pumped in flow channel 12
And a slot pipe 13 for communicating the introduction flow path 12 with the slot B _{S in} order to discharge the liquid from the slot B _S at the tip of the head B.

As shown in FIG. 1, a coating fluid L is applied to a coating head B through a pipe 4 at a predetermined pressure by a pump 3.
And is discharged from the flow path 12 through the slot pipe 13 from the slot portion B _S at a constant flow rate per unit time onto the surface of the workpiece W in the width direction.

As shown in FIG. 1, one or two or more pieces of the object-to-be-coated are placed so as to be movable in the horizontal direction. Is mounted and fixed. In FIG. 1, an unapplied object W is applied on a right end table C, an applied object W is being applied on an intermediate table C, and an applied object W is applied on a left end table C. W are mounted and fixed, respectively.

The mounting table C has a horizontal table main body 21 which can be moved in the horizontal direction, and a movement driving means for moving the table main body 21.

The movement drive means includes a drive source (servo motor, pulse motor, or air cylinder), a linear guide portion for guiding in the movement direction, and a drive transmission portion (gear, sprocket, chain, spiral shaft, rack gear and pinion). Gears).

As shown in FIG. 1, the mounting table C includes a horizontal table main body 21, a bracket 22 integrally provided at a lower portion (or a side portion) of the table main body 21, and a horizontal movement of the table main body 21. It has a linear guide 23 installed in the direction.

The linear guide 23 is connected to the table body 2
1 or a linear guide stay (shown) that slides and guides the outer surface of the bracket 22 or the table body 21
Alternatively, it is a linear guide shaft (not shown) fitted in a penetrating portion penetrating the bracket 22.

The lower portion of one or two or more tables 21 is supported by bearing support portions 24a, 24a (also serving as a frame of the device main body) installed at both ends (left and right ends of FIG. 1) of the device main body. A spiral shaft 24 screwed to the bracket 22 in the horizontal movement direction, a servomotor 25 for driving and rotating the spiral shaft 24, and a rotary encoder 25 a ( Or a moving position / moving amount detecting unit by a linear encoder installed in parallel with the linear guide 23).

As shown in FIG. 1, the servo motor 2
By rotating the spiral shaft 24 in the forward (or reverse) direction at a predetermined rotation speed by the step 5, the bracket 22 on which the shaft 24 is screwed moves forward (or backward), and the bracket 22 mounted on the bracket 22 is moved. The application object mounting table C moves forward (or retreats) in the horizontal direction along the linear guide 23, and moves horizontally below the application head B at a predetermined speed with a predetermined separation distance h (separation height). .

The horizontal movement speed of the application object placing table C is controlled by a control unit Q. The control unit Q includes an input unit and a central processing control unit (CPU circuit; microprocessor, programmable controller, sequencer, etc.).
, An operation unit, a storage unit such as a program memory, a control memory, a setup memory, an output unit for outputting input data, control data, control processing data, and the like, and a display unit (CRT, LCD) for visually displaying the output data.
Display, printer, etc.) and an external storage unit (recorder).

As the coating conditions known in advance, the name, size, thickness, and convex surface of the object to be coated W are input from an input unit such as a keyboard, a mouse, or a disk drive for downloading input data from a recording medium such as a floppy disk. The coating film thickness at w2, the surface condition of the object to be coated W (presence or absence of unevenness, height of the convex surface, coordinate value (x, y) as the existing position of the concave surface, or table C)
Is set and input to the central processing control unit.

Then, the control section Q calculates and outputs operation control data such as the optimum application moving speed of the mounting table C based on the application conditions, and based on the operation control data,
By controlling the rotation speed and rotation direction of the servo motor 25,
The horizontal movement speed of the application object placing table C is maintained at a predetermined speed, or the speed is changed, or the application object C is moved forward (leftward in FIG. 1) and moved backward (rightward in FIG. 1).

Alternatively, as the coating conditions known in advance, the name, size, and thickness of the object W to be coated are input from an input unit such as a keyboard, a mouse, or a disk drive for downloading input data from a recording medium such as a floppy disk. After setting and inputting the coating film thickness on the convex surface to the central processing control unit, the real-time coating conditions output during the operation of the apparatus main body are used as the real-time application conditions. State of the object W detected by a measuring unit such as an encoder for use or a displacement meter for measuring the uneven state of the surface of the object W to be coated (presence or absence of previously known irregularities, height of the convex surface) , The coordinate value (x, y) as the existence position of the concave surface or the position data only in the moving direction of the table C, the height difference of the unevenness, etc.) Input to the central processing control unit from the input unit in real time.

Then, the control unit Q calculates and outputs operation control data such as an optimum application moving speed of the mounting table C based on the application conditions, and based on the operation control data,
By controlling the rotation speed and rotation direction of the servo motor 25,
The horizontal movement speed of the application object placing table C is maintained at a predetermined speed, or the speed is changed, or the application object C is moved forward (leftward in FIG. 1) and moved backward (rightward in FIG. 1).

As shown in the front view of FIG. 2, the lifting mechanism D for raising and lowering the slot-type coating head B with respect to the work table C has a width of the work table C. Uprights 16, 16 standing vertically on both sides of the direction
And a support frame 17 supported by the columns 16, 16 and provided above the object-loading table C.

On the support frame 17, a bracket 19
Air cylinder (or hydraulic cylinder) or electric motor (pulse motor, etc.) mounted on and supported by
And a reciprocating drive source 18 having a downward elevating rod 18a that is driven to move up and down.

At the lower end of the elevating rod 18a, there is provided a horizontal support plate 14 mounted and supported on a movable body 14a which can freely move up and down along a linear guide formed by the columns 16 and 16.

Below the horizontal support plate 14, a head block 11 provided with a slot portion BS of the slot type coating head B at the lower portion is provided with an air cylinder (or a hydraulic cylinder) fixed to the support plate 14, or The lower end of a downwardly moving elevating rod 15a, which is provided on a reciprocating drive source 15 by an electric motor (such as a pulse motor) and moves up and down, is supported. The slot BS of the head block 11 is provided with an object mounting table. It is installed in parallel above C.

The elevating rod 18a of the reciprocating drive source 18 is used for a large range of elevating operation, and the reciprocating driving source 15 is used for an elevating operation of a small range (for fine adjustment).
Is used.

The lifting rod 18 of the reciprocating drive source 18
a (or the elevating rod 15a of the reciprocating drive source 15), the support plate 14
(Or the head block 11) moves up and down along with the slot portion BS attached to and supported by the support plate 14 while maintaining a parallel relationship with the workpiece mounting table C. The separation distance h (separation height)
It can be moved away or approaching as appropriate. In order to control the distance h with high accuracy, a detector (rotary encoder, linear encoder, Drive sources 18 and 15 by an electric motor equipped with an encoder) are appropriate, and the control thereof is performed by the drive sources 18 and 15.
By controlling the output of the number of pulses with respect to.

First, according to the first aspect of the present invention, the moving speed of the work piece mounting table C, which can move horizontally below the coating head B at a predetermined speed, is set to The speed can be changed based on the unevenness of the surface in the width direction (the surface of the workpiece W in a direction perpendicular to the moving direction of the table C).

Then, the coating head B (slot portion BS)
Relative to the mounting table C is always confirmed in real time by the moving position / moving amount detecting unit by the encoder 25a, and therefore, the coating head B (slot portion BS
), The relative position of the front end of the object W to be mounted and fixed at a fixed position on the mounting table C is always confirmed during operation.

On the other hand, when the surface of the object W to be coated has an uneven surface, as described above, the position of the concave surface on the object W to be applied is
Coordinate values (x, y) on the workpiece W or table C
Is input in advance to the central processing control unit from the input unit of the control unit Q as the position data in the moving direction of.

The control unit Q controls the rotation speed of the servo motor 25 based on the operation control data based on the application conditions, and also sets a region where a concave shape exists on the surface of the object W in the width direction. The timing during the passage under the coating head B is measured and calculated, and based on the timing, the rotation speed of the servo motor 25 is controlled to decelerate the table C to control the width of the workpiece W. After the region having the concave shape on the directional surface passes below the coating head B, the rotation speed of the servomotor 25 is controlled to increase to maintain the original predetermined speed.

Due to the deceleration of the table C when the concave surface of the workpiece W passes below the coating head B, the fluid L discharged from the slot portion BS of the coating head B at a constant flow rate is applied to the coating head B. It is applied to the concave surface of the object W with a larger application amount than the convex surface.

The deceleration rate of the table C in the coating operation on the concave surface of the object to be coated W is calculated by the control unit Q based on a previously set difference in height of the unevenness, and a predetermined speed is determined based on the calculation result. 3. The speed is reduced so that the concave surface w1 and the convex surface w2 are smoothly applied at the same height, and as shown in FIG. A smooth surface LS is applied by a fluid L as a coating film having the same height.

The coating film thickness of the fluid L on the convex surface w2, which is determined by the distance between the convex surface height and the slot portion BS, raises the slot type coating head B with respect to the workpiece mounting table C. -Set by the elevating mechanism D for lowering operation.

The control unit Q calculates and outputs a height adjustment amount based on the convex surface height data set in advance and the required coating film thickness data of the fluid L on the convex surface w2. Is output from the control unit Q via the pulse generator, and based on the output pulse number,
In the case of a large-range elevating operation, the driving source 18 of the elevating mechanism D
(Pulse motor) is started to move the lifting rod 18a up and down, and in the case of raising and lowering operation in a small width range (or fine adjustment), the drive source 15 (pulse motor) of the lifting mechanism D is started to raise and lower the lifting rod 15a. Then, the slot portion BS of the coating head B is raised and lowered so as to have a predetermined distance h.

Next, according to the second aspect of the present invention, as shown in FIG. 1, it is determined whether an uneven surface exists on the surface of the object W to be coated, as shown in FIG. The surface displacement meter N that detects the displacement of the surface of the unevenness state is confirmed and detected in real time during the operation of the apparatus main body. The displacement meter is suitably a non-contact type such as an ultrasonic type or an optical type, but may be a contact type using a stylus. It is appropriate that the measurement area by the displacement meter is measured over the entire length of the object W in the width direction (the direction orthogonal to the moving direction of the table C).

In the second invention, as the coating conditions known in advance, an object to be coated W is input from an input unit such as a keyboard, a mouse, or a disk drive for downloading input data from a recording medium such as a floppy disk.
The product name, size, thickness, coating film thickness on the convex surface w2, etc. are set and input to the central processing controller.

As a real-time application condition output during operation of the apparatus main body, a detection encoder 25a for detecting the position and amount of movement of each element of the apparatus main body.
The object W detected by synchronous detection of the object W and the displacement meter N for measuring the unevenness of the surface of the object W to be applied.
Is input from the input unit to the central processing control unit in real time as a control processing data signal.

One encoder 25a detects coordinate values (x, y) as the existing position of the concave surface or position data only in the moving direction of the table C, and synchronizes with the detection signal to detect the other displacement meter N. As a result, the presence or absence of unevenness, the height of the convex surface, and the unevenness height difference are detected, and these detected data are input to the central processing control unit in real time from the input unit as control processing data.

The control unit Q controls the rotation speed and the rotation direction of the servo motor 25 based on the operation control data based on the application conditions, and has a concave shape on the surface of the workpiece W in the width direction. The area is the coating head B
Is calculated by measuring the timing during the passage under the lower side, and based on the timing, the rotation speed of the servo motor 25 is controlled to decelerate and control the table C so that the surface of the object to be coated W in the width direction is controlled. After the area where the concave shape exists passes below the coating head B, the rotation speed of the servo motor 25 is controlled to increase to maintain the original optimum predetermined speed.

Due to the deceleration of the table C when the concave surface of the coating object W passes below the coating head B, the fluid L discharged from the slot portion BS of the coating head B at a constant flow rate is subjected to coating. It is applied to the concave surface of the object W with a larger application amount than the convex surface.

As for the deceleration rate of the table C in the coating operation on the concave surface of the workpiece W, an optimum predetermined deceleration coating speed is calculated and processed by the control unit Q based on the height difference of the unevenness set in advance. On the basis of the calculation result, the speed is reduced to a predetermined speed, and the speed is reduced so that the convex surface and the concave surface are smoothly coated at the same height, and as shown in FIG. Then, a smooth surface LS with a fluid L as a coating film having the same height without irregularities is applied.

In the second aspect of the present invention, the coating thickness of the fluid L on the convex surface w2 determined by the distance between the convex surface height and the slot portion BS is the same as in the first aspect. It is necessary to set the convex surface height data set in advance by the elevating mechanism D for moving the slot type coating head B up and down with respect to the coated object mounting table C and to set the fluid L on the convex surface w2. The control unit Q calculates and outputs a height adjustment amount based on the applied coating film thickness data, and outputs a pulse number corresponding to the adjustment amount via the pulse generator from the control unit Q. Based on the output pulse number, In the case of a large range elevating operation, the driving source 18 of the elevating mechanism D
(Pulse motor) is started to move the lifting rod 18a up and down, and in the case of raising and lowering operation in a small width range (or fine adjustment), the drive source 15 (pulse motor) of the lifting mechanism D is started to raise and lower the lifting rod 15a. Then, the slot portion BS of the coating head B is moved up and down so as to be at a predetermined distance h.

[0054]

According to the slot type fluid coating apparatus of the present invention, not only when the surface to be coated is smooth but also when the surface to be coated is uneven, the coated surface after coating is smooth without unevenness. A coating film having a coating surface is obtained, and a coating film having a smooth coating surface with no unevenness on the coating surface can be obtained by a single coating operation without coating twice or three times. This is effective when, for example, it is desired to apply several layers in a smooth manner.

[Brief description of the drawings]

FIG. 1 is an overall side view of a slot type fluid application device of the present invention.

FIG. 2 is a front view illustrating an elevating mechanism of the slot type fluid application device according to the present invention.

FIG. 3 is a side sectional view of an object to be coated applied by the slot type fluid application device of the present invention.

FIG. 4 is a side sectional view of an object to be coated, illustrating an application state by a conventional slot type fluid application device.

5 (a) and 5 (b) are side sectional views for explaining an application state of an object applied by a conventional slot type fluid application apparatus.

[Explanation of symbols]

1. Fluid storage tank 2. Discharge pipe 3. Pressure pump
DESCRIPTION OF SYMBOLS 4 ... Supply pipe 11 ... Head block 12 ... Introductory flow path 13 ... Slot flow path 14 ... Horizontal support plate 14a ... Movable body 15 ... Reciprocating drive source 15a ... Lifting rod 16 ... Column 17 ... Support frame 18 ... Reciprocating drive source 18a ... Elevating rod 19 Bracket 21 Table 22 Bracket 23 Linear guide 24 Spiral shaft 24a Bearing support 25
... Motor 25a ... Encoder A ... Extrusion part B ... Coating head part BS ... Slot part C
... Applied object mounting table L ... Coating fluid LS ... Coated film surface M ... Reservoir (bead) N ... Surface displacement meter P ... Convex pattern Q ... Control unit W ... Applied object w1 ...
Concave surface w2… convex surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05C 5/00-5/02 B05C 11/00 B05D 1/26 B05C 5/02 B05C 11/00

Claims (2)

(57) [Claims] 1. A fluid extruder A for extruding an application fluid L at a predetermined extrusion pressure, and a fluid ejection device A for applying the application fluid L to a surface of a workpiece W in a width direction at a constant discharge amount corresponding to the extrusion pressure. A slot-type coating head B that discharges and applies the coating material, and can move horizontally under the coating head B at a predetermined speed and can change the speed based on the unevenness of the surface in the width direction of the workpiece W. A workpiece mounting table C; and an elevating mechanism D for raising and lowering the slot-type coating head B with respect to the workpiece mounting table C. while existing area shape passes under side of the coating head B is characterized by the table C is controlled deceleration of the coating object W having an uneven shape in the width direction surface
A slot type fluid coating device that forms a coating film with a smooth surface on the surface . 2. A fluid extruder A for extruding an application fluid L at a predetermined extrusion pressure, and applying the application fluid L to a surface of a workpiece W in a width direction at a constant discharge amount corresponding to the extrusion pressure. A slot-type coating head B that discharges and applies the coating material, and can move horizontally under the coating head B at a predetermined speed and can change the speed based on the unevenness of the surface in the width direction of the workpiece W. An object mounting table C, and an elevating mechanism D for raising and lowering the slot-type coating head B with respect to the object mounting table C, are provided above the object mounting table C. A surface height displacement meter N for measuring the uneven surface shape of the workpiece W, and a concave shape in the width direction surface of the workpiece W based on the uneven surface data of the workpiece W by the displacement meter N. During the time when the area where By detecting grayed, the table C is being controlled deceleration based on the timing detection signal, the object to be coated W having an uneven shape in the width direction surface
A slot type fluid coating device that forms a coating film with a smooth surface on the surface .