JPH09122557A - Slotted fluid coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily prepare a coating film of a smooth and no rugged surface on the coated surface of a work to be coated by one coating not only when the surface of the work is smooth but also when the surface is rugged. SOLUTION: This coater is provided with a fluid extruding device A for extruding a coating fluid L at a specified pressure, a slotted coating head B for discharging the fluid L on the surface of a work W to be coated in its width direction with a discharge corresponding to the extruding pressure to coat the work, a work holding table C with the speed variable based on the rugged shape of the work surface in its width direction and a mechanism D for lifting the head B up and down with respect to the table C. The table C is reduced in speed while the region on the surface of the work W having ruggednesses passes under the head B.

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 device for coating a surface of an object to be coated with a coating fluid in a smooth state and uniformly with a predetermined film thickness.

[0002]

2. Description of the Related Art In a conventional slot type fluid coating apparatus, as shown in FIG.
_The coating fluid L (coating material) discharged from _S is separated from the discharge tip of the slot portion B _S and the surface of the object W to be coated (the slot from the surface of the object W to be coated). Part B
The height of the discharge tip portion of _S ) is maintained at a predetermined value, and the object W to be coated is relatively moved in the direction of the arrow with respect to the slot B _S to scrape off the excess coating material L to be applied. 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 thick film thickness. As such a fluid coating device, there is a curtain coater type fluid coating device in addition to this. Fluid coating is also performed by a screen printing device, a gravure coating device, or the like.

Further, in the conventional slot type fluid coating device, as shown in FIG. 4, the coating fluid L (coating material) discharged from the slot portion B _S of the slot type coating head B is coated with an object W to be coated. A semi-lens-shaped pool M of the coating material L called a bead is generated on the rear side (front side with respect to the relative traveling direction of the coating head B) with respect to the relative traveling direction of.

While the discharge tip of the slot portion B _S is held at the same height in the state where the pool M is generated, the object W to be coated is relatively moved in the arrow direction with respect to the slot portion B _S , and an excess amount is applied. By scraping off the coating material L, a uniform coating film having a predetermined value is formed on the object W to be coated.

[0006]

However, the object W to be coated by using the above-mentioned slot type fluid coating device is
As shown in the side views of FIGS. 5 (a) and 5 (b), the surface thereof is a concave-convex surface composed of a concave surface w1 and a convex surface w2 of the wiring pattern P portion, such as a printed circuit board on which the wiring pattern P is formed. In the case of the coating object W having
Since the shape of the coating changes depending on the uneven surface, and the coating film thickness slightly changes accordingly, it is difficult to control the coating film to be applied uniformly and smoothly.

Further, as shown in FIGS. 5 (a) and 5 (b), the surface LS of the object W to be coated, which is applied by using the above-mentioned slot type fluid coating device, has the unevenness before the coating. A rough coated surface having a similar shape to that of the surface cannot be obtained, and a smooth coated surface cannot be obtained.

On the other hand, in the curtain coater type fluid coating device, it is more difficult to control the coating range (area) of the curtain coater type coating head on the object W than the slot type, and the side surface of the object to be coated is coated. In some cases, the coating material may adhere to areas where it should not be, and like the slot type fluid coating device, when the surface to be coated of the object to be coated is an uneven surface, the coating film thickness is controlled uniformly. In addition, the coating surface of the object W to be coated presents a rough surface having a similar shape to the rough surface before coating.

On the other hand, in fluid application by a screen printing apparatus, the accuracy of the application thickness is poor, and when the surface to be coated of the object to be coated is an uneven surface and the interval between the recesses is narrow, the recess The coating material L does not sufficiently enter the inside, and the coating material L is applied in such a state that it encloses bubbles.

Further, since there is a limit to the thickness that can be applied at one time (the screen printable distance between the opposing screen surfaces and the object to be coated; 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 device in which not only the surface to be coated of the object to be coated is smooth, but also the surface of the object to be coated is uneven, so that the coated surface after application has no unevenness. It is to make it possible to easily obtain a coating film having a different coating surface by a single coating operation.

[0012]

Means for Solving the Problems A first invention of the present invention is:
A fluid extruding device A for extruding a coating fluid L at a predetermined extrusion pressure, and a coating fluid L is ejected across the width of the surface of an object W to be coated at a constant discharge amount corresponding to the extrusion pressure. A slot-type coating head B for coating, and a placement of a coating object that can move horizontally below the coating head B at a predetermined speed and that can change speed based on the uneven shape of the widthwise surface of the coating object W. A 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, and an area where a concave shape exists on the surface of the object W in the width direction. While passing under the coating head B,
In the slot type fluid application device, the table C is controlled to be decelerated.

Next, a second aspect of the present invention is a fluid extruding device A for extruding a coating fluid L at a predetermined extrusion pressure, and a coating 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 object to be coated W in the width direction, and a lower side of the coating head B that can be horizontally moved at a predetermined speed and is in the width direction of the object to be coated W. An object placing table C capable of shifting based on the uneven shape of the surface
And an elevating mechanism D for moving the slot type coating head B up and down with respect to the object mounting table C. Above the object mounting table C, the object W to be coated is provided.
Surface height displacement meter N for measuring the uneven surface shape of the object W, and based on the uneven surface shape data of the object W to be coated by the displacement meter N, a region where a concave shape exists on the widthwise surface of the object W to be coated is The slot type fluid application device is characterized in that the timing during the passage of the coating head B is detected and the table C is decelerated based on the timing detection signal.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The slot type fluid application device of the present invention will be described in detail below according to the embodiments.

FIG. 1 is a schematic side view of a slot type fluid coating apparatus according to the present invention. A is an extrusion apparatus for pushing out a fixed amount of coating fluid L, B is a slot type coating head, and C is a coating condition (application target). It is an object mounting table that can be changed according to the uneven surface shape of the object, the coating film thickness, etc.).

The extrusion apparatus A comprises a storage tank 1 for stocking 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 pumping to the B side and a pumping supply pipe 4 for supplying the 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 a slot portion B _S (for discharging the fluid L to be discharged) for discharging the fluid L toward the surface of the object W to be coated at the lower end portion thereof. A slit portion having a T-die shape that is applied linearly in the width direction of the applied material W is provided.

The slot type coating head B is a head body block 11 made of metal, an introduction flow path 12 bored in the block 11 for introducing the fluid L pressure-fed from the pressure-feeding supply pipe 4, and the introduction. Fluid L pumped in the flow path 12
In order to discharge from the slot portion B _S at the tip portion of the head B, a slot pipe 13 that connects the introduction flow path 12 and the slot portion B _S is provided.

As shown in FIG. 1, the coating fluid L is supplied to the coating head B through the pipe 4 at a predetermined pressure by the pump 3.
It is pressure-fed in and is discharged from the flow path 12 through the slot pipe 13 to the widthwise surface of the object to be coated W at a constant flow rate per unit time from the slot portion B _S.

As shown in FIG. 1, one or two or more object-to-be-laid tables C are movably installed in the horizontal direction, and the object W to be coated is placed on the table C. Is placed and fixed. In FIG. 1, an uncoated object W is applied on the rightmost table C, an intermediate object W is applied on the middle table C, and an already applied object is applied on the leftmost table C. Each W is placed and fixed.

The mounting table C comprises a horizontal table main body 21 which is movable in the horizontal direction, and a movement drive 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 & pinion). Gear etc.).

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

The linear guide 23 is the table body 2
1 or a linear guide stay (shown) for slidingly guiding the outer surface of the bracket 22 or the table body 21.
Alternatively, it is a linear guide shaft (not shown) fitted into a penetrating portion penetrating the bracket 22.

The bearing support portions 24a, 24a (also serving as the apparatus body frame) installed at both ends of the apparatus body (left and right end portions in FIG. 1) are pivotally supported to support one or more lower portions of the table 21. A spiral shaft 24 screwed to the bracket 22 in the horizontal movement direction, a servo motor 25 for driving and rotating the spiral shaft 24, and a rotary encoder 25a (installed in conjunction with a rotary operation system of the servo motor 25 ( Alternatively, a linear encoder installed in parallel to the linear guide 23) and a movement position / movement amount detection unit.

As shown in FIG. 1, the servo motor 2
5, the spiral shaft 24 is rotated in the forward (or reverse) direction at a predetermined rotation speed, so that the bracket 22 screwed to the shaft 24 moves forward (or backward), and the bracket 22 mounted on the bracket 22 is moved. The coating material placement table C moves forward (or backward) in the horizontal direction along the linear guide 23, and horizontally moves below the coating head B at a predetermined speed with a predetermined separation distance h (separation height). .

The horizontal movement speed of the object mounting table C is controlled by the control unit Q, which controls the input unit and the central processing control unit (CPU circuit; microprocessor, programmable controller, sequencer, etc.).
An arithmetic unit, a storage unit such as a program memory, a control memory, and 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 external storage (recorder).

As known coating conditions in advance, the product name, size, thickness, and convex surface of the article W to be coated are input from an input unit such as a keyboard or 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 state of the object W to be coated (presence or absence of known irregularities, height of the convex surface, coordinate values (x, y) as the position of the concave surface, or table C).
The position data only in the moving direction of (1), the unevenness height difference, etc.) are set and input to the central processing control unit.

Then, the control section Q calculates and outputs operation control data such as the optimum coating moving speed of the mounting table C based on the coating 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 object mounting table C is maintained at a predetermined speed, the speed is changed, or the forward movement (left direction in FIG. 1) and the backward movement (right direction in FIG. 1) are performed.

Alternatively, as the known coating conditions, the product name, size, and thickness of the object to be coated W can be obtained from an input unit such as a keyboard or a mouse or a disk drive for downloading input data from a recording medium such as a floppy disk. Detection of detecting the movement position and movement amount of each element of the device body as real-time coating conditions output during operation of the device body after setting and inputting the coating film thickness etc. on the convex surface to the central processing control unit State of the object W to be detected (presence or absence of known unevenness, height of convex surface known in advance) detected by a measuring unit such as an encoder for measurement or a displacement gauge for measuring the state of unevenness of the surface of the object W to be coated. , 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 unevenness height difference, etc.) are used as the control processing data signal. Input to the central processing control unit from the input unit in real time.

Then, the control section Q calculates and outputs operation control data such as the optimum coating moving speed of the mounting table C based on the coating 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 object mounting table C is maintained at a predetermined speed, the speed is changed, or the forward movement (left direction in FIG. 1) and the backward movement (right direction in FIG. 1) are performed.

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 object mounting table C has a width of the object mounting table C. Columns 16 standing vertically on both sides of the direction
And a support frame 17 which is supported by the columns 16 and is installed above the object mounting table C.

A bracket 19 is provided on the support frame 17.
Air cylinder (or hydraulic cylinder) or electric motor (pulse motor, etc.) mounted and supported on
The reciprocating drive source 18 is provided with a downward elevating rod 18a that is vertically driven.

At the lower end of the elevating rod 18a, there is provided a horizontal support plate 14 attached to and supported by a movable body 14a which freely moves in the vertical direction along a linear guide by the columns 16 and 16.

Below the horizontal support plate 14, a head block 11 having a slot portion BS of the slot type coating head B provided at the bottom thereof is attached to the support plate 14 by an air cylinder (or hydraulic cylinder) or fixed. The reciprocating drive source 15 is driven by an electric motor (pulse motor, etc.) and is mounted and supported on the lower end portion of a downward elevating rod 15a which is vertically moved up and down. The slot portion BS of the head block 11 is an object mounting table. It is installed parallel to C above it.

The elevating rod 18a of the reciprocating drive source 18 is used for a large range of raising and lowering operations, and the reciprocating drive source 15 is used for a narrow range of raising and lowering (for fine adjustment).
The lifting rod 15a is used.

Lifting rod 18 of the reciprocating drive source 18
a (or the lifting rod 15a of the reciprocating drive source 15) is moved up and down to move the support plate 14 to the linear guide 16
(Or the head block 11) ascends and descends, whereby the slot portions BS mounted and supported on the support plate 14 are held in parallel relationship with the object mounting table C, and their mutual positions are maintained. The separation distance h (separation height)
It is possible to appropriately perform a separating operation or an approaching operation. In order to control the separation distance h with high accuracy, a detector (rotary encoder, linear encoder) that detects the amount of vertical movement and the position of vertical movement is preferable to the case where an air cylinder or a hydraulic cylinder is used as the reciprocating drive sources 18 and 15. The drive sources 18, 15 by an electric motor equipped with an encoder are suitable, and the control is performed by the drive sources 18, 15
By controlling the output of the number of pulses to.

First, according to the first aspect of the present invention, the moving speed of the object placing table C capable of horizontally moving the lower side of the above-mentioned coating head B at a predetermined speed is the same as that of the object W to be coated. The speed can be changed based on the uneven shape of the surface in the width direction (the surface of the object W to be coated in the direction orthogonal to the moving direction of the table C).

The coating head B (slot portion BS)
The relative position of the mounting table C with respect to is always confirmed in real time by the moving position / moving amount detecting section by the encoder 25a, and therefore, the coating head B (slot section 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 the operation.

On the other hand, when an uneven surface is present on the surface of the article W to be coated, as described above, the existence position of the concave surface on the article W as the application condition is
Coordinate values (x, y) on the object W or table C
The position data in the moving direction is set and input in advance from the input unit of the control unit Q to the central processing control unit.

Then, the control section Q controls the rotation speed of the servomotor 25 based on the operation control data according to the coating condition, and the concave region on the surface in the width direction of the object W to be coated, The timing of passing the lower side of the coating head B is measured and calculated, and based on the timing, the rotation speed of the servo motor 25 is controlled to control the deceleration of the table C, and the width of the object W to be coated. After the region having the concave shape on the directional surface passes under the coating head B, the rotation speed of the servo motor 25 is controlled to be increased and maintained at the original predetermined speed.

Due to the deceleration of the table C when the concave surface of the object W to be coated passes under the coating head B, the fluid L discharged at a constant flow rate from the slot BS of the coating head B is to be coated. The coating amount is applied to the concave surface of the object W in a larger amount than that of the convex surface.

The deceleration rate of the table C in the coating operation on the concave surface of the object W to be coated is arithmetically processed by the control unit Q based on the height difference of the unevenness which is set in advance, and the predetermined speed is based on the arithmetic result. Then, the concave surface w1 and the convex surface w2 are decelerated so that the concave surface w1 and the convex surface w2 are evenly coated at the same height, and as shown in FIG. A smooth surface LS is coated with the 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, is raised by the slot type coating head B with respect to the object mounting table C. -Set by the lifting mechanism D for lowering operation.

Based on the convex surface height data which is input in advance and the required coating film thickness data of the fluid L on the convex surface w2, the controller Q calculates and outputs the height adjustment amount, and the adjustment amount. The pulse number corresponding to is output from the control unit Q via the pulse generator, and based on the output pulse number,
In the case of the raising / lowering operation of a wide range, the drive source 18 of the raising / lowering mechanism D
(Pulse motor) is started to move the lifting rod 18a up and down. In the case of a narrow range (or fine adjustment) lifting operation, the drive source 15 (pulse motor) of the lifting mechanism D is started to move the lifting rod 15a up and down. Then, the slot portion BS of the coating head B is moved up and down so as to have a predetermined separation distance h.

Next, according to the second aspect of the present invention, as shown in FIG. 1, it is determined whether or not there is an uneven surface on the surface of the article W to be coated. The surface displacement gauge N for detecting the displacement of the surface is used to confirm and detect the concavo-convex state of (3) in real time during operation of the apparatus main body. The displacement meter is preferably a non-contact type such as an ultrasonic type or an optical type, but may be a contact type using a stylus. In addition, it is appropriate that the measurement area by the displacement meter is measured over the entire length of the object W to be coated in the width direction (direction orthogonal to the moving direction of the table C).

In the second aspect of the invention, as the known coating conditions in advance, the object W to be coated is supplied 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 control section.

Then, as a real-time coating condition output during operation of the apparatus main body, a detection encoder 25a for detecting each element moving position and moving amount of the apparatus main body.
And the object W to be detected by the synchronous detection of the unevenness state of the surface of the object W to be coated
The surface condition of is input to the central processing control unit in real time from the input unit as a control processing data signal.

One of the encoders 25a detects the coordinate value (x, y) as the existing position of the concave surface or the position data only in the moving direction of the table C, and the other displacement gauge N is synchronized with the detection signal. The presence / absence of unevenness, the height of the convex surface, and the unevenness of unevenness are detected, and these detected data are input from the input unit to the central processing control unit in real time as control processing data.

The control section Q controls the rotation speed and the rotation direction of the servomotor 25 based on the operation control data according to the coating conditions, and the object W to be coated has a concave shape on the surface in the width direction. Area is the coating head B
The timing while passing the lower side is measured and calculated, and based on the timing, the rotation speed of the servo motor 25 is controlled, the deceleration control of the table C is performed, and the widthwise surface of the object W to be coated is controlled. After the region where the concave shape exists passes below the coating head B, the rotation speed of the servo motor 25 is controlled to be increased and maintained at the original optimum predetermined speed.

The fluid L discharged from the slot portion BS of the coating head B at a constant flow velocity by the deceleration of the table C when the concave surface of the coating object W passes under the coating head B is The coating amount is applied to the concave surface of the object W in a larger amount than that of the convex surface.

As for the deceleration rate of the table C in the coating operation on the concave surface of the object W to be coated, the controller Q calculates an optimal predetermined deceleration coating speed based on the height difference of the unevenness which is set in advance. Based on the calculation result, the speed is reduced to a predetermined speed, and the convex surface and the concave surface are decelerated so as to be coated uniformly on the same height. As shown in FIG. Then, a smooth surface LS is coated with the fluid L as a coating film having the same height without unevenness.

In the second invention, the coating thickness of the fluid L on the convex surface w2 determined by the distance between the height of the convex surface and the slot portion BS is similar to that of the first invention. It is necessary to set the convex surface height data set by the elevating mechanism D for raising and lowering the slot type coating head B with respect to the coating material mounting table C and preset and the fluid L on the convex surface w2. The controller Q calculates and outputs the height adjustment amount based on the applied film thickness data, and the controller Q outputs the number of pulses corresponding to the adjustment amount through the pulse generator. In the case of a wide range of lifting operation, the drive source 18 of the lifting mechanism D
(Pulse motor) is started to move the lifting rod 18a up and down. In the case of a narrow range (or fine adjustment) lifting operation, the drive source 15 (pulse motor) of the lifting mechanism D is started to move the lifting rod 15a up and down. Then, the slot portion BS of the coating head B is moved up and down so as to have a predetermined separation distance h.

[0054]

EFFECTS OF THE INVENTION The slot type fluid coating device of the present invention is not only smooth when the surface to be coated of the object to be coated but also has irregularities, the surface after coating is smooth and has no irregularities. A coating film having a coating surface can be obtained, and a coating film having a smooth coating surface without unevenness can be obtained by one coating operation without applying twice or three times. This is effective when you want to apply several layers smoothly and smoothly.

[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 of 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 for explaining a coating state by a conventional slot type fluid coating device.

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

[Explanation of symbols]

1 ... Fluid storage tank 2 ... Exhaust pipe 3 ... Pressure pump
4 ... Supply pipe 11 ... Head block 12 ... Introduction channel 13 ... Slot channel 14 ... Horizontal support plate 14a ... Movable body 15 ... Reciprocating drive source 15a ... Elevating rod 16 ... Strut 17 ... Support frame 18 ... Reciprocating drive source 18a ... Lifting rod 19 ... Bracket 21 ... Table 22 ... Bracket 23 ... Linear guide 24 ... Spiral shaft 24a ... Bearing support portion 25
… Motor 25a… Encoder A… Extrusion part B… Coating head part BS… Slot part C
... coating object placement table L ... coating fluid LS ... coating film surface M ... pool (bead) N ... surface displacement meter P ... convex pattern Q ... control unit W ... coating object w1 ...
Concave surface w2 ... Convex surface

Claims (2)

[Claims] 1. A fluid extruding device A for extruding a coating fluid L at a predetermined extrusion pressure, and a coating fluid L in a width direction on a surface of an object to be coated W at a constant discharge amount corresponding to the extrusion pressure. A slot type coating head B that discharges and coats all over, and a lower side of the coating head B can be horizontally moved at a predetermined speed and can be shifted based on the uneven shape of the widthwise surface of the object W to be coated. 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, and a concave portion is formed on the surface of the object W in the width direction. The slot type fluid coating device is characterized in that the table C is controlled to be decelerated while a region having a shape passes under the coating head B. 2. A fluid extruding device A for extruding a coating fluid L at a predetermined extrusion pressure, and a coating fluid L in a width direction on a surface of an object W to be coated at a constant discharge amount corresponding to the extrusion pressure. A slot type coating head B that discharges and coats all over, and a lower side of the coating head B can be horizontally moved at a predetermined speed and can be shifted based on the uneven shape of the widthwise surface of the object W to be coated. An object placing table C and an elevating mechanism D for moving the slot type coating head B up and down with respect to the object placing table C are provided above the object placing table C. A surface height displacement meter N for measuring the uneven surface shape of the object W to be coated, and a concave shape on the surface in the width direction of the object W to be coated based on the uneven surface shape data of the object W by the displacement meter N. During the passage of the area where Detects a grayed, slot type fluid applying apparatus, wherein the table C on the basis of the timing detection signal is controlled deceleration.