JP2004167709A - Screen printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an industrial sealing material employed in the fashion of a high quality and high performance raised printing, in which no saddling develops, no chance runs for sporadically developing marks of gauze threads, bubbles in a paste-like or ink-like coating matter are reduced and further the amount and thickness of the coating matter to be printed by contact are made uniform. <P>SOLUTION: In order to perform this screen printing, a matter 13 to be printed is abutted against a printing screen plate 19 by lifting a printing table 12. The paste-like or ink-like coating matter 21 printed through the screen plate 19 to the matter 13 to be printed with a printing squeegee 15. By putting the coating matter 21 of the printed matter 13 to be printed in vacuum atmosphere, the bubbles 21a developed from the coating matter 21 in the vacuum atmosphere are destroyed and scraped off with a scraping off squeegee 17. Next, by forming atmospheric pressure or low vacuum, the bubbles 21a are further destroyed. Then, by keeping the abutting state between the screen plate 19 and the matter 13 to be printed for a proper period of time, the uniformalization of the surface of the matter 13 to be printed is contrived. Lastly, the printing table 12 is descended. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screen printing method, and more specifically, a printing object is placed at a predetermined position on a printing table, a paste or ink-like coating material is supplied to the surface of a printing screen plate, and a screen is printed using a squeegee. The present invention relates to a screen printing method for performing screen printing of a thick film on a printing material by sliding a plate surface.
[0002]
[Prior art]
Conventionally, screen printing uses a squeegee to place an object to be printed at a predetermined position on a printing table and supply a paste or ink-like coating material made of an insulating material or a dielectric material on the surface of the printing screen plate, or Desired printing is performed on the printing surface of the printing material using a squeegee and a scraper.
[0003]
Conventional screen printing methods are performed under normal atmospheric pressure, and there are screen printing using a stencil using a stencil made of metal or the like and screen printing using a screen stencil made of a gauze printing plate. In the former screen printing using a stencil of metal or the like, printing is performed in such a manner that the stencil is brought into contact with a printing surface of a printing material and a paste or ink-like coating material is poured into a hole of the stencil. Printing is performed by a squeegee without using and coating.
[0004]
Further, in the latter screen printing using a screen printing plate made of a gauze printing plate, a clearance is provided between the screen printing plate and the printing surface of the printing material, and a paste or ink coating material is applied to the screen printing plate surface with a scraper. After coating, the paste-like or ink-like coating material coated on the screen plate surface is printed on the printing material with a squeegee.
[0005]
Also, in screen printing using a stencil made of metal or the like, bubbles accumulate below the holes of the stencil, and high-quality, high-performance electronic components cannot be resin-sealed when resin-sealing electronic components. Therefore, for example, bubbles are prevented from accumulating in the lower part of the hole of the stencil by resin sealing in a vacuum atmosphere (see Patent Document 1). In addition, there is a type in which the supply of a resin liquid under atmospheric pressure and the stencil printing in a vacuum atmosphere are performed by division of labor (see Patent Document 2).
[0006]
[Patent Document 1]
JP-A-2000-216526 (page 1-2, FIG. 1-4)
[Patent Document 2]
JP-A-10-313015 (page 1-2, FIG. 2)
[0007]
[Problems to be solved by the invention]
However, in the conventional screen printing method, the thickness of the ink in the ink reservoir is large, and air bubbles hardly appear. Further, since the ink pool is pressed and rolled, the ink containing bubbles is transferred. In addition, in the screen printing method using a stencil in a vacuum atmosphere, when the pressure is returned to the atmospheric pressure from the vacuum atmosphere, bubbles are removed from the surface of the printed resin sealing portion. Since the position and size of the generated and popping air bubbles cannot be assumed or adjusted, there is a possibility that a considerable gap may occur in the amount or thickness of the paste or ink applied material to be printed.
[0008]
When printing is performed with the stencil in contact with the printing surface of the printing material and the paste or ink-like coating material is poured into the stencil hole, if the stencil hole is frame-shaped, the inner island is used. Unless a part is provided with a bridge or the like, the part falls off, making it impossible to print in a frame shape.
[0009]
Further, in a screen printing method using a screen printing plate made of a gauze printing plate, an industrial sealing material which is a high-quality and uniform thick-film printing because a clearance is provided between the screen printing plate and a printing surface of a printing material. It was difficult to obtain such prints. That is, in off-contact printing, when the screen gauze emulsion is formed as a thick film, the center of the printed portion is hollowed out, and a so-called saddle phenomenon that protrudes at the entrance and exit of the printed portion occurs, and the surface of the printed surface is roughened. It has drawbacks, and in contact printing, it is difficult to separate the screen plate from the printing material, and paste-like or ink-like coating materials are scattered in the transfer portion on the screen plate in the form of being entangled with the yarn. However, the printed matter after printing has a defect that traces of the yarn are scattered on the surface of the printed matter.
[0010]
The present invention has no saddle phenomenon, has no danger of the traces of the yarn being scattered, can reduce the bubbles of the paste or ink-like coating material, and can reduce the amount and thickness of the coating material to be contact printed. It is an object of the present invention to provide a screen printing method capable of obtaining a high quality and high performance printing of a thick film with high quality and high performance, such as an industrial sealing material.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a screen printing method according to claim 1 of the present invention mounts an object to be printed on a predetermined position of a printing table and supplies a paste or ink-like applied material to the surface of the printing screen plate. And, in a screen printing method of performing a thick film screen printing on a printing substrate by sliding the screen plate surface using a squeegee,
The printing screen plate is brought into contact with a printing material, and a paste or ink-like coating material is printed on the printing material using the printing squeegee through the printing screen plate, and the printed printing material paste is printed. The paste-like or ink-like coating material is placed in a vacuum atmosphere, and bubbles generated from the paste-like or ink-like coating material generated in the vacuum atmosphere are broken using a scraping squeegee and scraped off. .
[0012]
According to a second aspect of the present invention, there is provided a screen printing method comprising: placing a printing substrate at a predetermined position on a printing table; supplying a paste or ink coating to the surface of the printing screen; and using a squeegee. In a screen printing method for performing screen printing of a thick film on a substrate by sliding a screen plate surface,
The printing table is raised to bring the printing material into contact with the printing screen plate, and the printing material is printed using a printing squeegee on the printing material in a paste or ink form through the printing screen plate. The paste-like or ink-like coating material of the printed material is placed in a vacuum atmosphere, and bubbles generated from the paste-like or ink-like coating material generated in the vacuum atmosphere are broken using a scraping squeegee, and the scraping is performed. Then, the air bubbles are further destroyed by reducing the pressure to atmospheric pressure or a low vacuum, the contact state between the screen plate and the printing medium is maintained for an appropriate period, and after the surface is made uniform, the printing table is lowered. It is characterized by the following.
[0013]
According to a third aspect of the present invention, there is provided a screen printing method wherein a bubble from the paste-like or ink-like applied material is broken, and a scraping squeegee for scraping is brought into contact with the printing screen plate in a substantially vertical state. It is characterized by the following.
[0014]
The screen printing method according to a fourth aspect of the present invention is characterized in that the printing target is an industrial sealing material.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a screen printing method according to the present invention will be described in detail with reference to the drawings.
FIGS. 1A, 1B, and 4C to 4A and 4B show a screen printing method according to the present invention, and FIG. 1A shows a state before printing is started. 1B is a cross-sectional explanatory view of a screen printing machine, FIG. 1B is a cross-sectional explanatory view of a state in which a printing table is raised and a printing squeegee is lowered on a screen plate, and FIG. 1C is a state in which the printing squeegee is driven. 2 (a) is a cross-sectional explanatory view of a state where the inside of the chamber is evacuated, FIG. 2 (b) is a cross-sectional explanatory view of a state where the printing squeegee is raised above the screen plate, and FIG. FIG. 3C is a cross-sectional explanatory view of a state in which the scraping squeegee is lowered on the screen plate, and FIG. 3A is a cross-section of the state in which the scraping squeegee is driven on the screen plate to crush bubbles and scrape bubbles. FIG. 3 (b) shows the squeegee for scraping above the screen plate. FIG. 3 (c) is a cross-sectional explanatory view showing a state in which the chamber is opened to a low vacuum to near atmospheric pressure, and FIG. 4 (a) holds the state of FIG. 3 (c) for a predetermined time. FIG. 4B is a cross-sectional explanatory view illustrating a state where the printing table is lowered and printing is completed.
[0016]
As shown in FIGS. 1 (a), 1 (b) and 4 (c) to 4 (a) and 4 (b), the present invention is a screen printing method comprising a contact printing using a screen printing plate made of a gauze printing plate. . The screen printing device 11 includes a printing squeegee 15 and a scraping squeegee 17 disposed above a printing material 13 such as a sealing material forming an industrial sealing material placed on a printing table 12. A screen plate 19 that has a squeegee, and is made of a mesh-pasted plate attached to a plate frame is disposed above the printing material 13 such as the sealing material.
[0017]
An ink 21 as a paste or ink-like coating material is supplied onto the screen plate 19, and the printing squeegee 15 and the scraping squeegee 17 are moved in the front-rear direction or the left-right direction and the up-down direction by a driving mechanism (not shown). Is driven. In the present embodiment, screen printing is performed on the surface of the printing material 13 by sliding the surface of the screen plate 19 in the left-right direction using the printing squeegee 15 and the scraping squeegee 17. .
[0018]
As shown in FIG. 1A, the printing table 12 on which a printing material 13 such as a sealing material is placed is raised as shown in FIG. 1B to start printing. At this time, the printing material 13 such as a sealing material and the screen plate 19 are gauze-plate contact printing with zero clearance. Further, as shown in FIG. 1B, the printing squeegee 15 is lowered, and the printing squeegee 15 is brought into contact with the upper surface of the screen plate 19. The attack angle θ1 of the printing squeegee 15 is 60 ° to 89 °.
[0019]
Next, as shown in FIG. 1C, the printing squeegee 15 is driven in the left-right direction to apply a paste or ink on the print pattern 19a of the screen plate 19 made of a meshed printing plate, that is, on the printing material 13. An ink 21 as an object is supplied. These steps in FIGS. 1A, 1B, and 1C are performed under atmospheric pressure.
[0020]
2A, the screen printing apparatus 11 is housed in a vacuum chamber 23, and a vacuum pump and a valve (not shown) are connected to the vacuum chamber 23 and provided in the vacuum chamber 23. By opening and closing the valve 25, it is possible to set a higher vacuum than the low vacuum or the atmospheric pressure. In the present embodiment, the vacuum chamber 23 is evacuated to about 133.29 pa (Pascal) to 1332.9 pa. Note that the configurations of the vacuum chamber 23 and the valve 25 can be set as appropriate.
[0021]
As shown in FIG. 2A, the ink 21 as a paste-like or ink-like coating material applied to the printing material 13 foams by evacuation, and generates many bubbles 21a. Next, as shown in FIG. 2B, the printing squeegee 15 is raised from the screen plate 19, and as shown in FIG. 2C, the scraping squeegee 17 is lowered, and the screen plate is 19 is slid in the left-right direction. At this time, the scraping squeegee 17 is brought into contact with the surface of the screen plate 19 in a substantially vertical state where the attack angle θ2 is about 90 °.
[0022]
Next, as shown in FIG. 3 (a), when the surface of the screen plate 19 is slid in the left-right direction while the scraping squeegee 17 is in a substantially vertical state, many bubbles 21a are crushed, and the bubbles bulging upward. 21a is scraped off, and the surface is uniformly prepared. The driving of the scraping squeegee 17 in the left-right direction can be performed a plurality of times. Next, as shown in FIG. 3B, the scraping squeegee 17 is raised. Next, as shown in FIG. 3C, the inside of the vacuum chamber 23 is opened to a low vacuum of about 90 kPa to about the atmospheric pressure, and the bubbles 21 a remaining in the ink 21 are subjected to a further bubble breaking treatment.
[0023]
As shown in FIG. 4A, the inside of the vacuum chamber 23 is opened to a low vacuum of about 90 kPa to about atmospheric pressure, and the contact state where the screen plate 19 and the printing surface of the printing material 13 are in contact is maintained for 10 seconds to 60 seconds. Then, the surface roughness of the printing surface of the printing medium 13 is eliminated, the surface is made uniform, and bubble-free printing is performed. The amount of the ink 21 as a paste or ink applied material corresponding to the print pattern 19a of the screen plate 19 is reduced and the surface is made uniform. As shown in FIG. 4B, the screen printing is completed by lowering the printing table 12 on which the printing material 13 is placed.
[0024]
【The invention's effect】
As described above, according to the screen printing method according to claim 1 of the present invention, the printing screen plate is brought into contact with the printing material, and the printing screen plate is pasted or printed on the printing material via the printing screen plate. The coated material is printed using a printing squeegee, and the paste-like or ink-like coated material of the printed substrate is placed in a vacuum atmosphere, and the paste-like or ink-like coated material generated in the vacuum atmosphere is removed. Air bubbles are destroyed using a scraping squeegee and scraped off, so there is no saddle phenomenon, there is no danger of scattered marks on the yarn, and it is possible to reduce the air bubbles in the paste or ink-like coating material. It is possible to make the quantity and thickness of the applied material to be contact printed uniform, and to obtain high quality and high performance thick film printing.
[0025]
Further, according to the screen printing method of the present invention, the printing table is raised to bring the printing material into contact with the printing screen plate, and the printing material is applied in paste or ink form through the printing screen plate. The object is printed using a printing squeegee, the paste-like or ink-like coated material of the printed substrate is placed in a vacuum atmosphere, and the paste-like or ink-like coated material generated in the vacuum atmosphere is removed from the paste-like or ink-like coated material. The bubbles are broken using a scraping squeegee, the bubbles are further broken by atmospheric pressure or low vacuum, and the contact state between the screen plate and the printing material is maintained for an appropriate time, and After the printing table is lowered, the saddle phenomenon does not occur, and there is no danger that the marks of the yarn are scattered. Can cause lack, a uniform amount and thickness of the contact the printed coated product, it is possible to obtain a print of high quality, high performance thick film.
[0026]
According to the screen printing method of the third aspect, the bubbles from the paste-like or ink-like coating material are broken, and the scraping squeegee for scraping is brought into contact with the printing screen plate in a substantially vertical state. In addition, the operation of breaking bubbles can be performed smoothly, and the printing surface can be made uniform.
[0027]
According to the screen printing method of the fourth aspect, since the printing object is an industrial sealing material, a thick-film printing without bubbles can be formed on the industrial sealing material, and the contact printing is performed. The quantity and thickness of objects can be made uniform, and high quality, high performance thick film printing can be obtained. Further, printing of a frame-shaped or ring-shaped industrial sealing material can be obtained.
[0028]
ADVANTAGE OF THE INVENTION According to this invention, there is no saddle phenomenon, there is no possibility that traces of a yarn may be scattered, it is possible to reduce bubbles in a paste-like or ink-like coating material, and it is possible to reduce the amount of the coating material to be contact printed. It is possible to obtain a screen printing method in which the thickness is made uniform and printing of an industrial sealing material or the like, which is a high-quality, high-performance thick film printing, can be obtained.
[Brief description of the drawings]
FIGS. 1A and 1B show a screen printing method according to the present invention, in which FIG. 1A is a cross-sectional explanatory view of a screen printing machine showing a state before printing is started, and FIG. FIG. 3C is an explanatory cross-sectional view of a state in which the printing squeegee is driven upward, and FIG.
FIG. 2 shows a screen printing method according to the present invention, in which (a) is a cross-sectional explanatory view showing a state where the inside of a chamber is evacuated, and (b) is a state where a printing squeegee is raised above a screen plate. (C) is a cross-sectional explanatory view of a state where the scraping squeegee is lowered on the screen plate.
FIGS. 3A and 3B show a screen printing method according to the present invention, in which FIG. 3A is a cross-sectional explanatory view of a state in which a scraping squeegee is driven on a screen plate and bubbles are crushed and bubbles are scraped, and FIG. FIG. 3C is a cross-sectional view illustrating a state in which the taking squeegee is raised above the screen plate, and FIG. 4C is a cross-sectional view illustrating a state where the inside of the chamber is opened to a low vacuum to near atmospheric pressure.
4A and 4B show a screen printing method according to the present invention, wherein FIG. 4A is a cross-sectional explanatory view showing a state in which the state of FIG. 3C is maintained for a predetermined time, and FIG. Sectional explanatory drawing of the state which completed printing.
[Explanation of symbols]
REFERENCE SIGNS LIST 11 screen printing device 12 printing table 13 substrate 15 printing squeegee 17 scraping squeegee 19 screen plate 19a printing pattern 21 ink 21a bubble 23 vacuum chamber 25 valve

Claims (4)

The printing object is placed at a predetermined position on the printing table, a paste or ink-like coating material is supplied to the surface of the printing screen plate, and the surface of the printing plate is slid using a squeegee to form a thick film on the printing plate. In a screen printing method for performing screen printing,
The printing screen plate is brought into contact with a printing material, and a paste or ink-like coating material is printed on the printing material using the printing squeegee through the printing screen plate, and the printed printing material paste is printed. The paste-like or ink-like coating material is placed in a vacuum atmosphere, and bubbles generated from the paste-like or ink-like coating material generated in the vacuum atmosphere are broken using a scraping squeegee and scraped off. Screen printing method. The printing object is placed at a predetermined position on the printing table, a paste or ink-like coating material is supplied to the surface of the printing screen plate, and the surface of the printing plate is slid using a squeegee to form a thick film on the printing plate. In a screen printing method for performing screen printing,
The printing table is raised to bring the printing material into contact with the printing screen plate, and the printing material is printed using a printing squeegee on the printing material in a paste or ink form through the printing screen plate. The paste-like or ink-like coating material of the printed material is placed in a vacuum atmosphere, and bubbles generated from the paste-like or ink-like coating material generated in the vacuum atmosphere are broken using a scraping squeegee, and the scraping is performed. Then, the air bubbles are further destroyed by reducing the pressure to atmospheric pressure or a low vacuum, the contact state between the screen plate and the printing medium is maintained for an appropriate period, and after the surface is made uniform, the printing table is lowered. A screen printing method characterized by the above-mentioned. 3. The printing screen plate according to claim 1, wherein bubbles from the paste-like or ink-like coating material are broken, and a scraping squeegee for scraping is brought into contact with a printing screen plate in a substantially vertical state. Screen printing method. 4. The screen printing method according to claim 1, wherein the printing target is an industrial sealing material.

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