JP2001038270A - Coating apparatus and method and printing apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating apparatus capable of carrying out a highly precise coating and improving the productivity. SOLUTION: This coating method uses a coating apparatus comprising a pair of scrapers 13 installed mutually face to face near the opening part 11 of a main body 5 having a squeezing means and forming an obtuse angle between the faces disposed face to face each other and an object face to be coated, so as to apply a coating material to the object face by bringing the tip ends of the scrapes into contact with the object face. The touching force of the scrapers and the object face is adjusted to be a prescribed fouching force and at the same time, the scrapers are moved relatively to the object face and a coating material stored in the inside of the main body is sent out through the opening part by squeezing force of the squeezing means to apply the coating material to the object face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and apparatus for applying various coating materials such as cream solder, conductor paste, or insulator paste.

[0002]

2. Description of the Related Art Conventionally, for example, when cream solder is printed in a predetermined pattern on a circuit board, as shown in FIG. 11, a mask having openings 44a corresponding to a desired pattern formed on a circuit board 43 is used. 44, and this mask 4
The cream solder 46 is placed on the mask solder 4 by moving the squeegee 45 in the direction of the arrow X along the mask surface while contacting the mask 44 with an appropriate applied pressure.
6 is moved on the mask 44 while performing a rotational movement called rolling (hereinafter referred to as rolling), and the cream solder 4 is inserted into the opening 44 a of the mask 44 by the rolling force of the cream solder 46 and the pushing force of the squeegee 45.
6, cream solder 46 is printed on the circuit board 43 via the mask 44.

[0003]

By the way, the printing accuracy of the conventional cream solder is such that electrodes and leads of a 1.6 mm × 0.8 mm chip component or a leaded electronic component having a lead pitch of 0.65 mm are joined. It is only necessary to be able to correspond to the land size and pitch, so even if there is some variation in the print dimensions and print thickness (hereinafter referred to as print quality) due to changes in the physical properties of the cream solder, it is within the allowable range. Even if it deviated from the above, the operator could easily cope with it by making adjustments.

However, recently, circuit boards have been reduced in size and density, and chip components having a size of 1.0 mm × 0.5 mm and electronic components with leads having a lead pitch of 0.5 mm have been used. As the miniaturization of electronic components and the narrowing of lead pitches progress, land dimensions and pitches also become minute, and a decrease in printing accuracy due to a change in physical properties of cream solder has had a great effect.

However, in the conventional method of moving and applying a squeegee, since the cream solder is exposed to the atmosphere, it is impossible to avoid a change in physical properties. That is, there has been a problem that the printability is reduced due to the change in the viscosity of the cream solder with the change in the environmental temperature, and printing defects such as blurring and missing defects occur. In addition, solvent in cream solder volatilizes by contact with air,
The viscosity also changes due to the reaction between the moisture in the air and the cream solder, causing a decrease in printability as well. As a result, there has been a problem that printing with the required accuracy cannot be performed. Further, there is a problem that the cream solder is oxidized by oxygen in the air and solder balls are generated, and poor wetting is caused to deteriorate soldering quality.

Further, in the above-mentioned conventional coating method, it is not possible to supply the required amount of cream solder at a time, and it is necessary to supply the cream solder at relatively short time intervals.
In addition, there is also a need to collect the cream solder protruding to the side of the mask due to the movement of the squeegee. There was also a problem.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a coating method and apparatus capable of performing high-precision coating and improving productivity.

[0008]

SUMMARY OF THE INVENTION According to the present invention, an oblique angle is formed between a surface on the opposite side and a surface to be coated which are disposed opposite to each other in the vicinity of an opening of a main body having a pushing means. A coating method in which a coating material is coated while a tip of the scraper is in contact with the surface to be coated, using a coating device having a pair of scrapers, wherein a contact force between the scraper and the surface to be coated is a predetermined force. A coating method for adjusting the contact force and relatively moving on the surface to be coated, and sending out the coating material housed in the main body from the opening by the pressing force of the pressing means to apply the coating material to the surface to be coated. And a storage unit for storing the coating material therein, an opening for discharging the coating material stored in the storage unit, a pushing unit for sending the coating material toward the opening by a pressing force, and The scraper includes a pair of scrapers disposed opposite to each other in the vicinity of the mouth, wherein the angle between the surfaces facing each other and the surface to be coated is obtuse, and the scraper is in contact with the surface to be coated. A coating device capable of adjusting a contact force between the substrate and the surface to be coated.

According to the present invention, the coating material is stored in the storage section in a non-open state with respect to the outside, and the coating material in the storage section is sent out to the space opened to the outside between the pair of scrapers by the pushing means. Coating on the surface to be coated, so that the coating material in the storage section does not come into contact with the atmosphere and change its physical properties, does not reduce printability or coatability, and enables high-precision coating. It is.

The pair of scrapers are disposed so as to be opposed to each other in the vicinity of the opening, and are formed such that the angle between the surfaces facing each other and the surface to be coated is an obtuse angle. The filling force of the applied coating material can be increased.

When the scraper is moved while abutting on the surface to be coated, the coating material applied to the surface to be coated can be scraped and collected in the storage section.

In addition, the contact force between the scraper and the surface to be coated is adjusted to a predetermined contact force and is relatively moved on the surface to be coated, so that the coating material stored in the main body is opened by the pushing force of the pushing means. And applied to the surface to be coated, the contact force between the scraper and the surface to be coated depends on the state of the surface to be coated, the support state of the surface to be coated, or the pressing force of the coating material or the coating material. It is possible to adjust to a predetermined contact force, and it is possible to perform the application / printing operation with an appropriate contact force. Here, the state of the surface to be coated refers to, for example, the material and the width and spacing of the wiring pattern when the surface to be coated is a circuit board, and the state of the material, the thickness and the elongation of the mask due to use when the mask is used. That is. The pushing force of the applying material by the pushing means allows the applying material to be filled at a high density without leaking from the contact point between the scraper and the surface to be applied, and to apply the applying material to an unnecessary portion of the surface to be applied. There is no. In addition, the scraper does not scrape the coating material applied to the coating surface excessively, and the film thickness of printing and coating can be improved. Further, damage to the scraper and the surface to be coated can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of a coating method and an apparatus according to the present invention, a method and an apparatus for printing a cream solder as a fluid will be described below with reference to FIGS.

In FIG. 1, 1 is a cream solder 3 on the surface.
Is a circuit board to be printed and applied. Reference numeral 2 denotes a metal mask disposed thereon, and an opening 2a is formed corresponding to the printing pattern. An application head 4 moves on the metal mask 2 and applies the cream solder 3. The application head 4 includes a main body 5 in which an application rotating body 7 is accommodated and arranged, and a supply unit 6 that supplies the cream solder 3 into the main body 5. It is configured.

The coating rotator 7 has a plurality of ridges 8 formed in the outer peripheral portion along the axial direction, and a housing recess 9 for housing the cream solder 3 is formed between the ridges 8. The cross-sectional shape of the ridge 8 is not limited to a triangular shape as shown in FIGS. 1 and 3A, but may be a trapezoidal shape as shown in FIG. 3B, and further as shown in FIG. As described above, the shape may be such that the accommodation recess 9 has an arc shape. Further, the ridges 8 may be continuous or intermittent over the entire length in the axial direction, and may be formed in a spiral shape not completely parallel to the axial center.

The main body 5 is formed with a cylindrical internal space 10 into which the coating rotator 7 just fits rotatably, and an opening 11 is formed below the internal space 10. A supply path 12 communicating with the supply section 6 is formed on the opposite side of the internal space 10 from the opening 11. Opening 11
Is configured so that a part of the outer peripheral portion of the coating rotator 7 is exposed to the outside as shown in FIG. 1, but may be configured so as not to be exposed as shown in FIG. This internal space is a storage section for storing the coating material.

Scrapers 13 are arranged on both sides of the opening 11 of the main body 5 so that the tip comes into contact with the surface of the metal mask 2 with a predetermined contact pressure (contact force). The scraper 13 is configured to be urged toward the metal mask by a spring 14 and to be adjustable in its arrangement position by an adjusting screw 15. In the illustrated example, the tip of the ridge 8 of the coating rotating body 7 is configured not to be in contact with the inner peripheral surface of the internal space 10 of the main body 5 and the scraper 13, but may be in contact with the scraper 13. It is sufficient that the tip of the ridge 8 does not contact the surface of the metal mask 2 when it is brought into contact with the surface of the metal mask 2, and the internal space 10 may be sealed from the external space.

The supply unit 6 includes a container 16 for accommodating the cream solder 3 therein, pressurized air supply means 17 for supplying pressurized air into the container 16 from its upper end, and moves into the container 16. The float 18 is freely arranged. A supply port 19 communicating with the supply path 12 of the main body 5 is formed at a lower end of the storage container 16, and an opening / closing valve 20 is provided in the supply port 19. Further, an initial filling port 21 for initially filling the cream solder 3 is formed so as to open in the vicinity of the on-off valve 20, and the cream solder 3 is replenished halfway to a position above the initial filling port 21 by an appropriate distance. A filling port 22 is formed. On-off valve 20
Agitate the cream solder 3 in the vicinity of
A stirring blade 23 for smoothing the flow of the liquid is provided.

A metal piece 24 is provided at an appropriate position on the outer periphery of the float 18. On the other hand, when the float 18 moves between the vicinity of the upper end in the container 16 and the position near the filling port 22, the metal piece 2
A position detection sensor 25 for detecting the position of the solder paste 4 is provided, and the metal piece 24 and the position detection sensor 25 constitute a remaining amount detection unit for the cream solder 3. Float 18
Is formed with an air vent hole 26 penetrating vertically, and a check valve 27 for preventing air from entering the cream solder filling chamber 29 below the float 18 from the pressurizing chamber 30 above the float 18. ing. A filter 28 is provided to prevent the cream solder 3 from entering the pressurizing chamber 30 when the cream solder 3 is filled.

A holder 31 is provided so as to cover the outer surfaces of the main body 5 and the storage container 16, and a temperature regulating water circulation passage 32 is formed in the holder 31. This circulation passage 3
2 is supplied with appropriate temperature-adjusted water by a temperature-adjusted water controller 33 based on the temperature measured by the temperature sensor 34;
The configuration is such that the temperature of the cream solder 3 in the main body 5 and the storage container 16 is kept constant. Also, the holder 31
And a heat insulating material layer 3 covering the outer surface of the scraper 13.
5 are formed.

In the above configuration, in order to print the cream solder 3, the cream solder 3 is first filled in the container 16. At this time, the on-off valve 20 is first closed, the cream solder 3 is filled from the initial filling port 21, and the cream solder 3 is filled from the lower end of the solder filling chamber 29 to reduce air entrapment. When the cream solder 3 is filled to a position beyond the filling port 22, pressurized air is supplied into the pressurized chamber 30 by the pressurized air supply means 17 and the float 1 is supplied.
8 is pressed down and brought into close contact with the filled cream solder 3. At that time, the air remaining in the solder filling chamber 29 is pushed out into the pressurizing chamber 30 by opening the check valve 27 from the air vent hole 26 as shown by a broken line. A filter 28 is provided below the air vent hole 26 so as to allow air to pass through but not the cream solder 3 so as to prevent the cream solder 3 from flowing into the pressurizing chamber 30. After the air is released, the supply of the pressurized air is stopped, the required amount is filled from the initial filling port 21, and the initial filling of the cream solder 3 is performed. Further, the remaining amount of the contained cream solder 3 is detected by the position detection sensor 25, and when the remaining amount decreases, the cream solder 3 is appropriately replenished from the filling port 22.

Next, in order to print the cream solder 3 on the circuit board 1 by the coating head 4, the coating head 4 is first disposed vertically on the metal mask 2, and the tip of the scraper 13 is placed on the surface of the metal mask 2. And awaits at the moving end position. In this state, while the pressurized air is supplied from the pressurized air supply means 17 of the coating head 4, the on-off valve 20 is opened and the coating rotating body 7 is rotationally driven in the moving direction of the coating head 4 as shown by the arrow Z. . Then, the cream solder 3 filled in the storage container 16 enters the internal space 10 of the main body 5 from the supply port 19 via the supply path 12 of the main body 5, and is sequentially filled in each of the storage recesses 9 of the application rotating body 7. Go. In this state, as shown in FIG.
Are sequentially supplied, and the space formed by the metal mask 2, the scraper 13, the internal space 10 of the main body 5, and the coating rotator 7 is filled with the cream solder 3.

Next, when the coating head 4 is moved in the direction of arrow Y, as shown in FIG. 2, the filled cream solder 3 flows in the flow direction A due to the rotation of the coating rotator 7 and is thereby generated. By the pushing force B, the cream solder 3 is reliably pushed into the opening 2a of the metal mask 2 and filled. Then, the excess cream solder 3 is scraped off by the subsequent scraper 13 and collected. Thus, the cream solder 3 is reliably and precisely filled in the opening 2a of the metal mask 2 so that the pattern of the cream solder 3 corresponding to the opening 2a of the metal mask 2 is formed on the circuit board 1 via the metal mask 2. Is printed.

In this printing process, most of the cream solder 3 is housed in a sealed housing container 16.
The cream solder 3 immediately before printing is also formed by the scraper 13, the internal space 10 of the main body 5, and the coating rotating body 7.
Since it is located in a closed space and is sealed from the outside atmosphere, the viscosity of the cream solder 3 does not change due to volatilization of the solvent in the cream solder 3 or the reaction between the moisture in the air and the cream solder 3. In addition, the printability does not decrease due to the change in viscosity due to such a cause. In addition, cream solder 3
Does not come into contact with air, the cream solder 3 is not oxidized by the reaction with oxygen or moisture in the air, the activation force is not reduced, and soldering defects such as solder balls and poor wetting are also generated. It can be effectively prevented. Further, the periphery of the main body 5 and the supply section 6 of the coating head 4 is surrounded by a holder 31 having a temperature-adjusted water circulation passage 31, so that the temperature of the cream solder 3 contained therein is kept constant. Also, the temperature of the cream solder 3 does not change due to the change in the environmental temperature, and the printability does not deteriorate due to the change in the viscosity of the cream solder due to the temperature change. Thus, high-precision printing without printing defects such as bleeding and missing defects can be performed, and the cause of soldering failure during reflow after printing / component mounting can be eliminated.

Further, by storing the required amount of cream solder 3 in the container 16, it is possible to operate for a long time and the productivity is improved.

In the above-described embodiment, an example is shown in which the shaft-shaped coating rotator 7 is used as the coating rotator. However, as shown in FIGS. It is also possible to use an application belt 36 in which the accommodation recess 9 is formed. The application belt 36 includes a pair of rollers 3 as shown in FIGS.
In FIG. 5, an intermediate roller 38 is disposed between the rollers 37 and 37 to provide tension and to make an angle with respect to the surface to be coated.

In the above embodiment, the supply section 6 is provided as a cream solder supply means, and the solder filling chamber 29 is filled with the cream solder 3 and supplied to the main body 5 as shown in FIG. Alternatively, the sealed container 39 in which the cream solder 3 is sealed and filled in advance may be arranged in the supply unit 6 and supplied to the main body 5. In the example of FIG. 7, a sealed container 39 called a syringe having a float inside is arranged, pressurized air is supplied from the pressurized air supply means 17, and the cream solder 3 is newly added to the main body 5. May be sequentially replaced with the sealed container 39 in which is filled.

Further, in the above-described embodiment, the supply unit 6 as cream solder supply means together with the main body 5 is provided on the coating head 4.
However, as shown in FIG. 8, the application head 4 may be composed of the main body 5 and its holder 31, and the cream solder supply means may be provided outside the application head 4. FIG.
In the example, the supply path 4 formed at the position of the axis of
0, the cream solder 3 is supplied via an appropriate pressure feed pipe, and a distribution passage 41 formed radially from the supply passage 40.
The cream solder 3 is supplied into each of the accommodation concave portions 9.

Further, in the above-described embodiment, an example is shown in which the supply path 12 is provided at one central portion on the opposite side to the opening 11 of the main body 5, but as shown in FIGS. Supply paths 42a and 42b may be provided on both sides of the body 7, respectively. 9 and 10, the main unit 5 and the supply unit 6 are provided.
Are provided integrally. Then, in FIG.
The solder filling chamber 29, the float 18 and the pressurizing chamber 30 are provided respectively corresponding to the a and b, and the supply paths 42a and 42b are communicated with the common single solder filling chamber 29 in FIG. , Any of these methods can be used.

In the above embodiment, the cream solder 3
Is printed using the metal mask 2, but the present invention can be applied to screen printing as it is. Further, the present invention is applicable not only to printing but also to other coating apparatuses. For example, if a predetermined gap is provided between the tip of the scraper 13 and the surface to be coated, the coating can be applied to a coating apparatus that forms a uniform coating film.

As described above, according to the present invention, the coating material is stored in the storage portion in a non-open state to the outside, and the coating material in the storage portion is sent out to the space opened between the pair of scrapers by the pushing means. Coating on the surface to be coated, so that the coating material in the storage section does not come into contact with the atmosphere and change its physical properties, does not reduce printability or coatability, and enables high-precision coating. It is.

By supplying the coating material into the storage section by the coating material supply means, continuous operation can be performed for a long time, and productivity can be improved.

Further, when the supply means of the coating material is constituted by a storage container connected to the storage portion and the pressurizing means, it is possible to operate for a long time with a simple configuration by increasing the capacity of the storage container, and Since the amount of coating material in the storage section can be reduced, the amount of coating material to be removed at the time of operation stop or maintenance can be reduced, and the viscosity of the coating material can be properly adjusted by providing temperature adjustment means in the main body and the storage container. The coating can be made uniform and highly accurate.

When the float is arranged in the container and pressurized by pressurized air as the pressurizing means, the coating material can be supplied to the container with a simple structure.

Further, if a metal piece is provided on the float and its position is detected, the remaining amount of the coating material can be easily detected, and the management becomes easy.

By providing an air vent hole and a check valve in the float, the float and the coating material can be brought into close contact with each other to prevent contact with the outside air, and the air can be easily filled when the coating material is filled in the container. Filling can be performed with biting prevented.

When an on-off valve is provided at a connection portion of the container with the main body, the interior of the container can be kept in a sealed state even when the main body is separated and maintained, so that the handling is easy and the coating material is not wasted. .

When the stirring blade is provided in the container, the flow of the coating material can be made smooth.

Further, by providing a temperature adjusting means in the main body or the storage container, the viscosity of the coating material can be made constant with high accuracy, and high-precision coating can be performed. If a temperature adjusting fluid is used as the means, the temperature can be easily adjusted. It exerts a great effect that it can be performed with high accuracy.

[0040]

According to the coating method and apparatus of the present invention,
The coating material is stored in the storage section in a non-open state with respect to the outside, and the coating material in the storage section is sent out by a pushing means to a space opened to the outside between the pair of scrapers and is coated on the surface to be coated. Therefore, the coating material in the storage section does not come into contact with the atmosphere to cause a change in physical properties, does not cause deterioration in printability and coatability, and enables highly accurate coating.

Further, the pair of scrapers are disposed so as to face each other in the vicinity of the opening, and are formed such that the angle between the surfaces facing each other and the surface to be coated is an obtuse angle. The filling force of the applied coating material can be increased.

When the scraper is moved while being in contact with the surface to be coated, the coating material applied to the surface to be coated can be scraped and collected in the storage section.

Further, the contact force between the scraper and the surface to be coated is adjusted to a predetermined contact force, and the scraper is relatively moved on the surface to be coated. Is applied from the scraper to the surface to be coated, and the contact force between the scraper and the surface to be coated is adjusted according to the state of the surface to be coated or to a predetermined contact force according to the pressing force of the coating material or the coating material. This makes it possible to perform the application / printing operation with an appropriate contact force. The pushing force of the applying material by the pushing means allows the applying material to be filled at a high density without leaking from the contact point between the scraper and the surface to be applied, and to apply the applying material to an unnecessary portion of the surface to be applied. There is no. In addition, the scraper does not scrape the coating material applied to the coating surface excessively, and the film thickness of printing and coating can be improved. Further, damage to the scraper and the surface to be coated can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a coating apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an operation of a coating process of the coating apparatus shown in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the cross-sectional shape of the coating rotator.

FIG. 4 is a sectional view of a second embodiment of the main body according to the present invention.

FIG. 5 is a side view of a coating rotator according to a second embodiment of the present invention.

FIG. 6 is a side view of a third embodiment of an application rotating body according to the present invention.

FIG. 7 is a sectional view showing a schematic configuration of a second embodiment of the present invention.

FIG. 8 is a sectional view of a third embodiment of the present invention.

FIG. 9 is a sectional view showing a schematic configuration of a fourth embodiment of the present invention.

FIG. 10 is a sectional view showing a schematic configuration of a modification of the fifth embodiment of the present invention.

FIG. 11 is a sectional view of a conventional example.

[Explanation of symbols]

 Reference Signs List 4 coating head 5 main body 6 supply section 7 coating rotator 8 ridge 9 storage recess 11 opening 12 supply path 13 scraper 16 storage container 17 pressurized air supply means 18 float 20 opening / closing valve 23 stirring blade 24 metal piece 25 position detection Sensor 26 Air vent hole 27 Check valve 32 Temperature control water circulation passage 33 Temperature control water control device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 7/00 B05D 7/00 H B41F 15/08 303 B41F 15/08 303E 15/40 15/40 B 15 / 44 15/44 B

Claims (10)

[Claims] 1. A coating apparatus having a pair of scrapers disposed opposite to each other in the vicinity of an opening of a main body having a pushing means and having an obtuse angle between a surface on the side facing each other and a surface to be coated. Use, a coating method of applying a coating material while contacting the tip of the scraper to the surface to be coated, while adjusting the contact force between the scraper and the surface to be coated to a predetermined contact force, A coating method in which a scraper is relatively moved on the surface to be coated, and the coating material accommodated in the main body is sent out from the opening by the pushing force of the pushing means and applied to the surface to be coated. 2. A printing apparatus having a pair of scrapers disposed opposite to each other in the vicinity of an opening of a main body having a pushing means and having an obtuse angle between a surface on the side facing each other and a surface to be printed. A printing method for applying a coating material while contacting a tip of the scraper with the printing surface, wherein the scraping device adjusts a contact force between the scraper and the printing surface to a predetermined contact force, and A printing method in which the material is relatively moved on the surface to be printed, and the application material stored in the main body is sent out from the opening by the pushing force of the pushing means to apply the material on the surface to be printed. 3. A printing apparatus having a pair of scrapers disposed opposite to each other in the vicinity of an opening of a main body having a pushing means and having an obtuse angle between a surface on the side facing each other and a circuit board surface. Use, a printing method of applying a coating material while contacting the tip of the scraper to the circuit board surface, while adjusting the contact force between the scraper and the circuit board surface to a predetermined contact force, A printing method in which a scraper is relatively moved on the circuit board, and the application material stored in the main body is sent out from the opening by the pushing force of the pushing means and applied to the circuit board. 4. A mask having a mask opening corresponding to a printing pattern is arranged on a circuit board, and is disposed in the vicinity of an opening of a main body having a pressing means and opposed to each other. Using a printing apparatus having a pair of scrapers whose angle with the mask surface is an obtuse angle, a printing method of applying a coating material while contacting the tip of the scraper with the mask, wherein the scraper and the mask While adjusting the contact force to a predetermined contact force, the scraper is relatively moved on the mask, and the coating material stored inside the main body is sent out from the opening by the pushing force of the pushing means. A printing method of applying the ink to the circuit board through the mask opening. 5. An accommodating portion for accommodating an application material therein, an opening for discharging the application material accommodated in the accommodating portion, and a pushing means for sending the application material toward the opening by a pushing force; The pair of scrapers disposed opposite to each other in the vicinity of the opening, and an angle between the surfaces facing each other and the surface to be coated is an obtuse angle, and has a pair of scrapers in contact with the surface to be coated. A coating device capable of adjusting a contact force between the scraper and the surface to be coated; 6. A storage section for storing the coating material therein, an opening for discharging the coating material stored in the storage section, and a pushing means for sending the coating material toward the opening by a pressing force; The printing apparatus has a pair of scrapers disposed opposite to each other in the vicinity of the opening, and an angle between the surface on the side facing the opening and the surface to be printed is an obtuse angle, and the scraper is in contact with the surface to be printed. A printing device capable of adjusting the contact force between the scraper and the printing surface. 7. An accommodating portion for accommodating an application material therein, an opening for discharging the application material accommodated in the accommodating portion, and pushing means for sending the application material toward the opening by a pushing force; A pair of scrapers disposed opposite to each other in the vicinity of the opening and formed between the surfaces facing each other and the circuit board surface at an obtuse angle, and a pair of scrapers in contact with the circuit board surface; A printing apparatus capable of adjusting a contact force between the printing apparatus and the circuit board surface. 8. A mask disposed on a circuit board and having a mask opening, a storage section for storing the coating material therein, an opening for discharging the coating material stored in the storage section, and the coating section. A pressing means for feeding a material toward the opening by a pressing force, and an angle between a surface on the side facing the opening and a surface facing the mask and an obtuse angle, and the mask A printing apparatus, comprising: a pair of scrapers abutting on a surface, wherein an abutting force between the scraper and the mask surface can be adjusted. 9. The coating apparatus according to claim 5, wherein the pair of scrapers are disposed at positions substantially symmetric with respect to the center of the opening. 10. The printing apparatus according to claim 6, wherein the pair of scrapers are disposed substantially symmetrically with respect to the center of the opening.