KR101660062B1 - Applicator and application method - Google Patents

Abstract

The adhesive agent can be spread evenly over the entire surface of the work at the time of joining of the work, thereby preventing the adhesive from being released. The adhesive R is supplied so that the application end of the adhesive R in the vicinity of the two corners of the rectangular work W is closer to the edge of the work W than the application end of the adhesive R therebetween (Not shown). The supply unit S includes a plurality of nozzles 21 and 31 for discharging the adhesive R and a drive unit for linearly driving the supply unit S. [ The supply section S includes a first supply section 2 for applying an adhesive agent R in the vicinity of two corners opposite to the two corners of the workpiece W and a second supply section 2 for applying an adhesive agent R therebetween 2 supply unit 3, as shown in Fig.

Description

APPLICATOR AND APPLICATION METHOD [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus and a coating method in which, for example, a technique of applying an adhesive agent for bonding a liquid crystal module and a rectangular plate-like work such as a cover panel is improved.

Generally, a liquid crystal panel is manufactured by bonding a liquid crystal module to a panel or sheet for protecting the surface thereof. In order to bond such a liquid crystal module to a panel or sheet (hereinafter referred to as a work), it is necessary to apply an adhesive to one of the pair of workpieces by a coating device and then press the other workpieces.

As the adhesive, a resin is generally used. Examples of a method for joining the entire surface of the work using a resin include a spin coat method and a slit coat method. The spin coating method is a method of spreading an adhesive dropped on a work by a centrifugal force generated by the rotation of a work. The slit coat method is a method in which an adhesive is applied to the entire surface of a work by moving a head or a work while dropping an adhesive from a head having a slit-shaped opening in the width direction of the work (see Patent Document 1 ).

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-05682 Patent Document 2: JP-A-2002-323687

Incidentally, since the spin-coating method uses the centrifugal force of rotation, the leading-edge direction becomes radial. Therefore, the spin-coat method is suitable when the workpiece is a circular shape having the same distance from the center to the edge. However, in the case of a rectangular work, the distance from the center of the work to the edge is not the same, and in particular, it is distant from the corner, so that it is difficult to uniformly spread the adhesive. Further, in the case of the slit coat method, since the application width is determined according to the slit length, it is difficult to adjust the application width and the application amount in accordance with the work.

In order to cope with this, a coating method using a multi-point nozzle has been proposed. This is a method in which the adhesive R is applied in a plurality of parallel straight lines by dropping the adhesive R while moving a plurality of nozzles relative to the work W as shown in Fig. 10 Patent Document 2). According to the application method using the multi-point nozzle, it is possible to adjust the application width and the application amount in accordance with the work by selecting which of the plurality of nozzles is to be opened or closed.

However, even in the case of the adhesive R applied using such a multi-point nozzle, the speed at which the adhesive R spreads is not uniform over the entire surface, as shown in Fig. 11, when the other work W is pressed . That is, when the work W is pressed on the linearly-applied adhesive R, as shown in Fig. 11A, the work W is squeezed in the lateral direction (left-right direction in the figure) It spreads faster.

As shown in Fig. 11 (b), when a plurality of linearly applied adhesives R are adjacent to each other, when the adjacent adhesives R are adhered to each other at the time of pressing, The amount of spread in the longitudinal direction in search of the place to go (per unit time) increases rapidly. Therefore, finally, as shown in Fig. 12, before the adhesive agent R spreads evenly at the four corners, or before the adhesive agent R sufficiently spreads at the four corners, the adhesive agent R is evacuated from the edge portions There was a possibility to get out.

As described above, when the adhesive R does not spread evenly, adhesion failure occurs. In addition, in the case of pellet bonding of semiconductors, the reason why the adhesive R comes out is that it is allowed to some extent because there is no electrode on the side of the side. However, in the case of the liquid crystal panel, since the vacant adhesive affects the lead electrode or the like, it is necessary to form a weir at the edge to prevent it from coming out, or to wipe off the adhesive that has been removed.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the problems of the prior art as described above, and an object of the present invention is to provide a method and apparatus for spreading an adhesive over an entire surface of a work, And a method of applying the same.

In order to attain the above object, the present invention is a coating apparatus for applying an adhesive to a work having a rectangular flat plate shape having two parallel sides facing each other, the apparatus comprising: a nozzle for discharging an adhesive, And a driving unit for driving at least one of the supplying unit and the work so that the adhesive sent out through the nozzle is applied in a plurality of linear lines parallel to each other in the direction along the two sides, A control device for controlling the supply of the adhesive by the supply portion so that the application end of the adhesive linearly coated in the vicinity of the side is closer to the two sides of the work other than the two sides than the application end of the other linearly coated adhesive .

According to another aspect of the present invention, there is provided a coating method for applying an adhesive in a plurality of rows linearly to a workpiece of a rectangular flat plate type by means of a supply portion for supplying an adhesive through a nozzle, comprising the steps of applying an adhesive agent linearly coated in the vicinity of two opposing sides Are closer to the two sides of the work than the two sides than the application end of the other linearly coated adhesive.

According to the invention as described above, since the adhesive is applied to the vicinity of the edge of the work in advance in the vicinity of the corner of the work where the leading edge of the adhesive is delayed when the work is squeezed, It is carried on the whole.

According to another aspect of the present invention, a plurality of the nozzles are provided in the supply section.

In the above-described aspect, the adhesive can be applied in a parallel straight line shape by supplying the adhesive through the plurality of openings while linearly moving the supply portion relative to the work. The application width and the amount of application can be easily adjusted by selecting the opening to be used.

In another aspect, the supply portion is provided so as to be changeable in angle.

In the above-described embodiment, the position of the adhesive application end from the edge of the work can be easily adjusted by tilting the supply portion.

In another aspect, the supply portion includes a second supply portion for applying an adhesive between a first supply portion for applying an adhesive in the vicinity of two opposing sides of the work and an adhesive applied in the vicinity of two opposing sides of the work .
According to another aspect of the present invention, the supplying section has a first supplying section and a second supplying section, and the first supplying section applies an adhesive to the vicinity of two opposing sides of the work, and the second supplying section is provided in the vicinity of two opposing sides Characterized in that an adhesive is applied between the applied adhesives.

In the above-described embodiment, the difference in the application end can be easily realized by dividing the first supply portion and the second supply portion.

In another aspect, the first supply unit and the second supply unit are provided so as to be independently movable.

In the above-described embodiment, the coating length can be easily changed by independently moving the first supply portion and the second supply portion.

In another aspect, the first supply unit and the second supply unit include a dispensing unit or a switching unit that controls the supply of the adhesive.

In the above-described aspect, by operating the dispensing means or the switching means, the supply timing by the first supply portion and the second supply portion can be changed, and the position of the adhesive application end can be easily adjusted.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide a coating device and a coating method that can spread the adhesive over the entire work surface during bonding of the work and prevent the adhesive from being discharged.

1 is a perspective view showing a configuration of an embodiment of the present invention.
2 is a plan view showing an example of application of the region A according to the embodiment of FIG.
3 is a plan view showing an example of application of the region B according to the embodiment of FIG.
4 is a plan view showing a coating result according to the embodiment of FIG.
Fig. 5 is a plan view showing bonding after coating according to the embodiment of Fig. 1; Fig.
Fig. 6 is a perspective view showing an example of a supply section according to another embodiment of the present invention. Fig.
7 is a plan view showing a forward path of a coating example according to another embodiment of the present invention.
8 is a plan view showing the return path of the application example of Fig.
Fig. 9 is a plan view showing the application result of the application example of Fig. 7; Fig.
10 is a plan view showing an example of application by a conventional multi-point nozzle.
Fig. 11 is an explanatory view showing the spread of the adhesive after application of Fig. 10; Fig.
FIG. 12 is a plan view showing the bonding after application of FIG. 10; FIG.

Next, embodiments of the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.

[Configuration]

First, the configuration of the present embodiment will be described. As shown in Fig. 1, the coating device 1 of the present embodiment includes a table T, a supply portion S, and the like. The table T is a base on which a rectangular work W to be coated with the adhesive R is disposed.

The supply unit S includes a first supply unit 2, a second supply unit 3, and the like. The first supply part 2 includes a supply head 22, an arm 23, and the like. The supply head 22 is provided with a single nozzle 21 directed downward. The supply head 22 is attached to the end of the arm 23. The nozzle 21 is connected to an adhesive supply source such as a tank through a passage or a pipe in the arm 23 (not shown). The piping is connected to a pump, which is a means for delivering an adhesive, and a valve, which is an opening / closing means, though not shown.

The second supply part 3 includes a supply head 32, an arm 33, and the like. The supply head 32 is provided with a plurality of downwardly directed nozzles 31. The plurality of nozzles 31 are linearly arranged at regular intervals. 2, the nozzles 31 at both ends of the supply head 32 are arranged so that when the centers of the supply head 32 and the work W in the width direction W, the adhesive application space by the first supply part 2 is set to be unobtainable. In the present embodiment, the application space is approximately the length of the coating line for two rows on the left and right sides, but the present invention is not limited to a specific width.

The supply head 32 is connected to the end of the arm 33. The nozzle 31 of the supply head 32 is connected to an adhesive supply source such as a tank through a passage or a pipe in the arm 33 although not shown. A pump, which is an adhesive dispensing means, a valve, which is an opening / closing means, is connected to the piping, though not shown.

The first supply part 2 and the second supply part 3 are independently movable up and down by a driving part (not shown) so as to be horizontally movable. As the driving unit, all well-known techniques can be applied. The arms 23 and 33 are moved in the horizontal direction (in the Z-axis direction) by a lifting mechanism for elevating and lowering the arms 23 and 33 (for example, in the Z-axis direction) by a cylinder, a feed screw, a rack or a conveyor, XY-axis direction), and the like.

In addition, the table T may be moved in the X-Y-Z axis direction by raising and lowering the table T by means of the above-mentioned driving unit and horizontally movably. That is, the table T and the first supply unit 2 and the second supply unit 3 can be configured to be relatively movable.

Each driving source, switch, power source, etc. of the driving unit, the pump, the valve, and the like are controlled by the control device. This control device is configured to operate each part by the following procedure, for example, by a dedicated electronic circuit or a computer operating with a predetermined program.

[Action]

The operation of the present embodiment having the above-described configuration is as follows. A method of controlling a coating device and a computer program for operating the control device in the procedures described below are also an aspect of the present invention.

First, as shown in Fig. 1, an operator, a handling apparatus, or the like mounts a workpiece W on a table T. Then, as shown in Fig. 2, the second supplying portion 3 is aligned with the center of the work W in the width direction by the driving portion. The control unit causes the driving unit to move the second supply unit 3 in the longitudinal direction of the work W and move the adhesive R to the nozzle 31 ). As a result, the adhesive R is applied to the area A of the work W in a plurality of parallel line shapes.

Next, as shown in Fig. 3, the first supplying unit 2 is positioned by the driving unit so that the nozzle 21 is located near the lower right corner of the work W in the drawing. This positioning makes the edge of the work W closer to the edge of the work W than the end of the adhesive R applied to the area A. The controller moves the first supply part 2 in the longitudinal direction of the work W by the drive unit and drops the adhesive R from the nozzle 21 by the action of a pump and a valve.

The end of the application of the adhesive R is also made closer to the edge of the work W than the end of the adhesive R applied to the area A. [ This operation is performed in two rows in a blank space (area B in the figure) on the left and right of the A area. 4, the application end of the adhesive agent R in the vicinity of the four corners of the workpiece W is closer to the edge of the workpiece W than the application end of the adhesive agent R therebetween Both ends of the adhesive R applied to the vicinities of the opposite sides of the work W in the vicinity of the two sides of the work W are bonded to the opposite ends of the work W, Near the edge].

As described above, when the other work (not shown) of the object to be bonded is pressed against the work W to which the adhesive R is applied as described above, the longitudinal spread of the A region is faster than the B region Since both ends of the adhesive R in the area A are farther from the edge of the work W than both ends of the adhesive R in the area B, the points of arrival at both ends after a predetermined time elapse are approximately equal. Therefore, as shown in Fig. 5, the adhesive R can be evenly spread over the entire work W while preventing the work W from coming out. The method of controlling the coating length may be performed by previously setting the length of the application time (dropping time of the adhesive R) in the control device, or by setting the lengths of the first supply part 2 and the second supply part 3 And the long and short ends of the moving distance may be set in advance in the control device.

[effect]

According to the present embodiment as described above, in the region (area A) where the adhesive R expands at the time of pressing, the application end of the adhesive R is moved away from the edge of the work W, In the area (area B) in which the adhesive agent R is spreading later, by making the application end of the adhesive R close to the edge of the work W, the difference in the arrival position at each end within a certain time is corrected, , The adhesive agent R can evenly spread over the entire work W.

It is also possible to apply a plurality of rows of adhesives R simultaneously to a large space (region A) by using the second supply portion 3 and to use only a small space (region B) at both ends by using the first supply portion 2 And the single nozzle 21, it is possible to efficiently apply the coating solution in a short time, and it is easy to match the position of the desired coating position and the shape of the work W.

[Other Embodiments]

The present invention is not limited to the above-described embodiment. For example, in the above embodiment, the first supply unit 2 and the second supply unit 3 are driven independently of each other. However, as shown in Fig. 6, the first supply portion 2 and the second supply portion 3 may be configured to move integrally.

In such a case, by controlling the operation of the pump, the switching timing of the valve, and the like, the first supply part 2 starts supplying the adhesive faster than the second supply part 3 in the process of moving the supply part S , And if it is completed late, the above-described application can be performed at the same time, and efficiency is good. In addition, the number of nozzles of the first supply part 2 and the second supply part 3 is not limited to the number exemplified in the above embodiment, but may be a single number or a plurality of nozzles. Closing means such as a shutter which is opened or closed independently for each nozzle may be provided or an opening and closing means such as a shutter independent of the nozzle of the first supplying portion and the nozzle of the second supplying portion may be provided.

7 to 8 can be performed by providing the supply part S such as the second supply part 3 so as to be able to change the angle in the horizontal direction. This is because, as shown in Fig. 7, the supply section S is inclined so that the application end of the adhesive R is brought close to one corner of the work W so as to move linearly Apply heat. If the opposite side is coated, the angle of the supply part S is reversed as shown in Fig. Then, a plurality of rows are coated while moving linearly in the reverse direction. 9, since the application end of the adhesive R approaches the edge of the work W near the four corners of the work W, the same effects as those of the above-described embodiment can be expected have.

The opening for supplying the adhesive is not limited to the shape of the nozzle. For example, it may be a simple hole or slit. The driving of the driving unit may not always be linear. For example, it may be driven to draw a predetermined angle or arc, or may be driven in a waveform or a serpentine shape. As the adhesive, any material available now or in the future can be applied. For example, it is also possible to irradiate an external electromagnetic wave from the outside, such as an ultraviolet curing type or a radiation curing type resin, or to cure by applying a temperature change like a thermosetting resin.

The work to be bonded is a typical example of a cover panel and a liquid crystal module (a touch panel, a display panel, and a backlight laminated), but can be widely applied as a device for joining a rectangular flat work having corners have.

1: dispensing device 2: first supply part 3: second supply part 21: 31: nozzle 22: 32: supply head 23: 33: arm R: adhesive S: work

Claims (8)

A coating apparatus for applying an adhesive to a work having a rectangular plate-like work to be joined and having two parallel sides facing each other,
A supply portion provided with a nozzle for discharging an adhesive and supplying an adhesive to the work through the nozzle;
And a driving part for driving at least one of the supplying part and the work so that the adhesive sent out through the nozzle is applied in a plurality of linear lines parallel to each other in the direction along the two sides,
And,
Wherein the application end of the adhesive linearly coated in the vicinity of the two sides is controlled so as to be closer to the two sides of the work other than the two sides than the application end of the other linearly coated adhesive, Device,
Wherein the supply unit includes:
A first supply portion for applying an adhesive to the vicinity of two opposing sides of the work,
Between the adhesives applied in the vicinity of the opposite sides of the work, a second supply part
Wherein the coating device comprises: delete delete delete The application device according to claim 1, wherein the first supply unit and the second supply unit are independently movable. The application device according to claim 1, wherein the first supply unit and the second supply unit include delivery means or switching means for controlling the supply of adhesive. There is provided a coating method for applying an adhesive in a plurality of linear lines to a rectangular flat work in which bonding is carried out by a supply part for supplying an adhesive through a nozzle,
The application end of the adhesive linearly coated in the vicinity of the two opposite sides of the work is applied so as to be closer to the two sides of the work other than the two sides than the application end of the other linearly coated adhesive,
Wherein the supply unit includes a first supply unit and a second supply unit,
An adhesive is applied to the vicinity of two opposing sides of the work by the first supply unit,
And an adhesive is applied between the adhesive applied to the vicinity of two opposing sides of the work by the second supply unit. delete

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