JP4007206B2 - Screen printing method and printing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screen printing method and a printing apparatus, and in particular, a screen printing method for applying a printing paste applied to the surface of a screen printing plate having a predetermined pattern opening on a substrate with a squeegee from the pattern opening, and the method The present invention relates to a printing apparatus used in the method.
[0002]
[Prior art and issues]
Conventionally, for example, when screen printing a plurality of internal electrodes in a predetermined pattern with a conductive printing paste on a ceramic green sheet, the following procedure is used.
[0003]
Procedure (1): The surface of the screen printing plate having a predetermined pattern opening is covered with a printing paste by a scraper.
Procedure {circle around (2)}: Printing on the substrate by squeezing the surface of the screen printing plate.
Procedure (3): Repeat procedures (1) and (2) until the printing state is stabilized (trial printing).
Procedure {circle over (4)}: When the printing state is stabilized, the main printing is performed.
[0004]
Conventionally, when screen printing is performed, blotting or blurring occurs until the pattern opening becomes familiar with the printing paste, and it is necessary to perform trial printing (procedure (3)) several times until the printing state is stabilized. In addition to the loss of printing paste, the time loss was also large. In particular, such loss ratios were remarkable in various small-scale production.
[0005]
[Patent Document 1]
Japanese Unexamined Utility Model Publication No. 2-46628 This document 1 is provided with a mechanism for supplying a transparent tape for trial printing to the back side of the screen printing plate, and printing on the transparent tape during the trial printing reduces the loss of the substrate. A screen printer to be reduced is disclosed.
[0006]
Certainly, in the screen printing machine disclosed in Document 1, the loss of the printed material due to the trial printing is eliminated. However, since the number of trial printing itself is not reduced, the loss of printing paste and the time loss are not solved. In addition, when the printability (liquid absorbency, surface roughness, etc.) of the transparent tape for trial printing and the printed material is different, smearing of the paste may occur on the back surface of the screen printing plate. As a result, trial printing was necessary until the printing state was stabilized, and there was a case that was not a solution.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a screen printing method and a printing apparatus that can reduce the number of trial printings and reduce the loss of printed material and printing paste and the time loss.
[0008]
[Means and Actions for Solving the Problems]
In order to achieve the above object, a first invention is a screen printing method in which a printing paste applied to the surface of a screen printing plate having a predetermined pattern opening is applied from a pattern opening onto a substrate with a squeegee. The liquid which dissolves the printing paste wets the back surface including the pattern opening of the screen printing plate, and starts printing on the substrate before the printing paste dissolving liquid is dried.
[0009]
In the screen printing method according to the first invention, wetting the back surface including a pattern opening of the screen printing plate in the printing paste dissolving liquid, the printing on the substrate before the printing paste dissolving liquid is dried As a result, the priming effect of drawing the printing paste to the pattern opening is exerted, the paste is easily filled into the pattern opening, and the number of trial printings is reduced.
[0010]
In the screen printing method according to the first aspect, the printing paste is supplied to the surface of the screen printing plate before the printing paste dissolving liquid is dried, and the surface of the screen printing plate is covered with the printing paste. In this case, the printing may be left for a predetermined time, and then printing on the printing material may be started. In addition to exerting the priming effect, before the printing paste dissolving liquid dries, the printing paste is supplied to the surface of the screen printing plate, and the surface of the screen printing plate is covered with the printing paste and left for a predetermined time. Therefore, the paste is surely filled in the pattern openings, and the number of trial printings is reduced. In this case, it is preferable that the predetermined time for leaving the surface of the screen printing plate covered with the printing paste is 10 to 120 seconds.
[0011]
Further, the wetting back surface including a pattern opening of the screen printing plate in the printing paste dissolving liquid, the method wetting the back surface including a pattern opening of the screen printing plate member moistened with printing paste dissolving liquid or printing At least one of the methods of wiping the back surface including the pattern opening of the screen printing plate while pressing the cloth-like body containing the paste dissolving liquid for use with the pressing member can be employed. When the back surface including the pattern opening of the printing plate is wetted or wiped, it is preferably performed uniformly.
[0012]
Further, in the screen printing method according to the first invention, before the printing paste dissolving liquid is dried, the printing paste is supplied to the surface of the screen printing plate and the surface of the screen printing plate is covered with the printing paste. The pattern opening may be filled with a printing paste with a squeegee with the back surface of the screen printing plate not in contact with the substrate, and then printing on the substrate may be started. The priming effect is exerted, and before the printing paste dissolving liquid dries, the printing paste is supplied to the surface of the screen printing plate to cover the surface of the screen printing plate with the printing paste, and the surface of the screen printing plate is covered. Since the paste for printing is filled into the pattern openings with the squeegee, the paste is surely filled into the pattern openings, and the number of trial printings is reduced.
[0013]
A screen printing apparatus according to a second invention includes a screen printing plate having a predetermined pattern opening, and a squeegee for applying a printing paste applied to the surface of the screen printing plate on the substrate from the pattern opening. And a liquid applying means for applying a liquid for dissolving the printing paste to the back surface including the pattern opening of the screen printing plate.
[0014]
According to the screen printing apparatus according to the second invention, the screen printing method according to the first invention can be easily implemented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a screen printing method and a printing apparatus according to the present invention will be described below with reference to the accompanying drawings.
[0016]
(Printing device and screen printing plate)
FIG. 1 shows a printing apparatus for carrying out the screen printing method according to the present invention. In this printing apparatus, a screen printing plate 1 having a predetermined pattern opening is stacked at a predetermined interval above a substrate 10 fixed on a table 11, and applied to the surface of the screen printing plate 1 by a scraper 3. In this screen printing apparatus, a predetermined paste is applied to the printing material 10 side with the squeegee 4 to apply the printing paste onto the printing material 10 from the pattern opening.
[0017]
Between the table 11 and the screen printing plate 1, a belt-like waste cloth 5, its pressing member 6, a nozzle 7 for supplying a liquid having affinity for printing paste to the waste cloth 5, and the waste cloth shown in FIG. A member 8 is installed.
[0018]
Here, the liquid having affinity with the printing paste is a solvent contained in the printing paste, a solvent used for cleaning the solvent or the paste, or an organic solvent such as ethanol, acetone, etc. .
[0019]
As long as the belt-like waste 5 is a long body that can contain the affinity liquid, various materials such as cloth, paper, and cleaning paper can be used. The pressing member 6 is a rod-shaped body or a cylindrical body made of rubber, resin, metal, or the like, and may have a liquid discharge function instead of the liquid supply nozzle 7 to the waste 5.
[0020]
The waste member 8 is for uniformly wetting the entire back surface of the screen printing plate 1 with the affinity liquid. If the member can achieve this purpose, it has a semicircular cross section as shown in FIG. Not limited to this, it may be a roller-like or belt-like member.
[0021]
As shown in FIG. 2, the screen printing plate 1 is a so-called electroforming pattern in which the pattern opening 2 has a two-layer structure of a graphic portion 2a and a mesh portion 2b, and an internal electrode for a multilayer capacitor is formed on the surface of the ceramic green pattern. It is for forming. The electroforming pattern has already been disclosed in detail in Japanese Patent Application Laid-Open No. 5-85077 and Japanese Patent Application No. 2002-175012 by the present applicant.
[0022]
Specifically, the mesh portion 2b has an opening ratio of 40% or less, preferably 30%, a mesh opening shape of 50 μm square or less, preferably 35 μm, and a mesh thickness of 1 to 50 μm, preferably 35 μm. The thickness of the graphic part 2a is 1 to 50 μm, preferably 10 to 30 μm. Of course, the size is not limited to this, and a screen printing plate having only a normal screen opening may be used. In the following drawings, only the pattern opening 2 is shown for simplification.
[0023]
The printing paste used in the screen printing plate 1 has a viscosity of 20 Pa · S or less, preferably 10 Pa · S.
[0024]
(First embodiment)
In the screen printing method according to the first embodiment, procedures (1) to (5) described below are continuously executed.
[0025]
Procedure (1) (see Fig. 3):
The back surface of the dried screen printing plate 1 is uniformly wetted with the waste member 8 soaked with the affinity liquid. Thus, the affinity liquid M adheres to and fills the back surface of the screen printing plate 1 and the pattern openings 2. In the procedure (1), various liquid applying means such as a roller can be used in addition to the waste member 8.
[0026]
Procedure (2) (See Figs. 4 and 5)
The back surface of the screen printing plate 1 is uniformly wiped with a waste cloth 5 (liquid wiping means) soaked with the affinity liquid M while being lined with a pressing member 6. Thus, excess affinity liquid adhering to the back surface of the screen printing plate 1 is wiped off, and the affinity liquid M is permeated to every corner of the pattern opening 2.
[0027]
As a moving method of the waste 5 and the pressing member 6, the waste 5 may be fixed and only the pressing member 6 may be moved along the back surface of the screen printing plate 1, or the relative position of the waste 5 and the pressing member 6 may be determined. You may move along the back surface of the screen printing plate 1 simultaneously in the fixed state. The latter is advantageous for repeated use because the area of the waste 5 used is smaller and the amount of the affinity liquid M used is smaller.
[0028]
In this procedure (2), the procedure (1) has already been performed and the back surface of the screen printing plate 1 has been wetted with the affinity liquid M, so that the affinity liquid M is not soaked into the waste cloth 5. It is also possible to wipe only the back surface of the screen printing plate 1.
[0029]
Further, in the procedure (2), as shown in FIG. 5, the roller 9 made of waste or the like may be rotated along the back surface of the screen printing plate 1 to wipe off excess affinity liquid. The roller 9 may or may not be soaked with the affinity liquid.
[0030]
As a moving method of the roller 9, the roller 9 may be moved along the back surface of the screen printing plate 1 while rotating, or the roller 9 may be moved along the back surface of the screen printing plate 1 without rotating. Good. The latter is advantageous for repeated use because the area of the roller 9 is smaller and the amount of the affinity liquid M used is smaller.
[0031]
Procedure (3) (See Fig. 6)
The printing paste N is supplied to the surface of the screen printing plate 1 and the test printing is performed once or twice. Thus, the printing paste N penetrates and fills the pattern openings 2. Here, the number of trial printings is arbitrarily selected according to the printing conditions, the type of paste N, and the like. Further, the printing pressure in the trial printing may be set larger than that in the main printing so that the printing paste N is further permeated and filled in the pattern openings 2.
[0032]
If the aperture ratio of the pattern opening 2 is sufficiently large and the paste N sufficiently permeates the affinity liquid M in the pattern opening 2 by its own weight, the trial printing here is unnecessary.
[0033]
Procedure (4) (See Fig. 6)
As shown in FIG. 6 (A), the surface of the screen printing plate 1 is left for 10 to 120 seconds with the printing paste N covered. Thus, the paste N permeates into the affinity liquid M in the pattern opening 2 by its own weight. The leaving time is arbitrarily selected according to the printing conditions, the type of paste N, and the like.
[0034]
Procedure ▲ 5 ▼
Ordinary printing (main printing) is performed on the substrate 10.
[0035]
By executing the above procedures (1), (2), (3), (4), and (5), as shown by the curve A in the graph of FIG. 7, in the first embodiment, In the sixth printing, the change rate of the printing area was 0%. That is, good printing without blurring or blurring was possible in the sixth printing.
[0036]
Incidentally, in the conventional printing method, as shown by the curve C in the graph of FIG. 7, the smearing or blurring of the paste occurred until the 20th printing or later.
[0037]
Here, the operation of the procedures (1), (2), (3), and (4) will be described. In the procedure (1), in order to fill the pattern opening 2 with a liquid having high affinity with the printing paste, the printing paste is drawn to the pattern opening 2 (hereinafter referred to as a priming effect), In this case, the paste is easily filled in the pattern openings 2.
[0038]
In procedure {circle around (2)}, the affinity liquid adhering to the back surface of the screen printing plate 1 in contact with the printing material is wiped off, and the affinity liquid sufficiently penetrates to every corner of the pattern opening 2. In the procedure {circle around (2)}, the affinity liquid is soaked in the waste 5 to achieve the same action as the procedure {circle around (1)}. That is, the procedure (2) can be replaced with the procedure (1).
[0039]
In the procedure (3), the affinity liquid M and the paste N filled in the pattern opening 2 in advance are well blended, and the paste N is formed in the pattern opening compared to the case where the pattern opening 2 is printed from a dry state. 2 is smoothly filled.
[0040]
In step (4), the entire surface of the screen printing plate 1 is covered with the paste N and left for a predetermined time, so that the paste N permeates the affinity liquid M in the pattern opening 2 by its own weight. By printing on the substrate from this state, the paste N is smoothly filled into the pattern openings 2.
[0041]
(Second Embodiment)
In the second embodiment, only the procedures (1) and (5) are performed. That is, the back surface of the screen printing plate 1 is uniformly wetted with the liquid M having high affinity with the printing paste N, and printing on the substrate 10 is started before the affinity liquid M is dried.
[0042]
In the procedure {circle around (1)}, the priming effect is exerted as described above, and the state in which the paste N is easily filled in the pattern openings 2 occurs. Therefore, if printing is started before the affinity liquid M is dried, the initial printing is performed. Even if it exists, the paste N is smoothly filled into the pattern opening 2, and the number of trial printings until the printing state is stabilized is reduced. That is, in the second embodiment, as indicated by the curve B in the graph of FIG. 7, the change rate of the printing area becomes 0% in the ninth printing, and good printing without blurring or blurring is possible. became.
[0043]
(Third embodiment)
In the third embodiment, only the procedures (2) and (5) are performed. That is, the back surface of the screen printing plate 1 is uniformly wiped with the affinity liquid M by wiping the back surface of the screen printing plate 1 uniformly with the waste 5 impregnated with the liquid M having high affinity with the printing paste N. And the printing on the substrate 10 is started before the affinity liquid M is dried.
[0044]
Also in the procedure (2), the priming effect is exhibited as described above, and the state in which the paste N is easily filled in the pattern opening 2 occurs. Therefore, if printing is started before the affinity liquid M is dried, the initial printing is performed. Even if it exists, the paste N is smoothly filled into the pattern opening 2, and the number of trial printings until the printing state is stabilized is reduced.
[0045]
In particular, in the third embodiment, compared to the second embodiment, the excess affinity liquid M on the back surface of the screen printing plate 1 is wiped away with the waste 5, so that the printing material of the affinity liquid M is printed. 10 and adhesion of the paste N are reduced, and the number of trial printings is reduced.
[0046]
(Fourth embodiment)
In the fourth embodiment, the following procedures (3) and (4) are performed in place of the procedures (3) and (4) of the first embodiment, that is, procedures (1), (2), Perform (3) ', (4)', and (5). Note that only one of the procedures (1) and (2) may be performed.
[0047]
In procedure {circle around (3)}, a printing paste N is supplied to the surface of the screen printing plate 1. In step (4), the paste N is squeezed with a squeegee 4. When this squeezing is performed, a sufficient interval between the back surface of the screen printing plate 1 and the surface of the printing material 10 is set so that the back surface of the printing plate 1 does not contact the printing material 10. Alternatively, the pressure of the squeegee 4 may be set lower than that during printing so that the back surface of the printing plate 1 does not contact the substrate 10. By this squeezing, the printing paste N penetrates the affinity liquid M filled in the pattern openings 2.
[0048]
In the fourth embodiment, the priming effect is exhibited by the squeezing of the procedure (4) as described above, and even if the printing paste N is at a low pressure, the pattern opening 2 is easily filled and the printing state is stable. The number of trial printings until the time is reduced.
[0049]
(Other embodiments)
The screen printing method and the printing apparatus according to the present invention are not limited to the above-described embodiment, and can be variously modified within the scope of the gist.
[0050]
In particular, in the first embodiment, it is not always necessary to perform all of the procedures (1) to (5). The procedures (1), (2), (5), procedures (1), (2) , (3), (5), procedures (1), (4), (5), procedures (1), (2), (4), (5), procedures (1), (3), (4) A combination of ▼ and (5) may be used.
[0051]
【The invention's effect】
As apparent from the above description, according to the screen printing method according to the present invention, wetting the back surface including a pattern opening of the screen printing plate in liquid which dissolves the printing paste, the printing paste dissolving liquid is dried Since printing on the substrate was started before, the priming effect of drawing the printing paste to the pattern opening was exhibited, the paste was easily filled into the pattern opening, the number of trial printings was reduced, and the substrate Loss of printing paste and time loss are reduced.
[0052]
In addition, according to the screen printing method of the present invention, it is possible to easily implement a printing method that exhibits the above effects.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating an example of a screen printing apparatus according to the present invention.
FIG. 2 is a cross-sectional view showing a screen printing plate used in the screen printing method according to the present invention.
FIG. 3 is an explanatory view showing a procedure (1) of the screen printing method according to the present invention.
FIG. 4 is an explanatory diagram showing a first example of procedure (2) of the screen printing method according to the present invention.
FIG. 5 is an explanatory diagram showing a second example of procedure (2) of the screen printing method according to the present invention.
FIG. 6 is an explanatory diagram showing procedures (3) and (4) of the screen printing method according to the present invention.
FIG. 7 is a graph showing the relationship between the number of trial printings and the printing area change rate in the screen printing method in comparison between the present invention (curves A and B) and a conventional example (curve C).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Screen printing plate 2 ... Pattern opening 3 ... Scraper 4 ... Squeegee 5 ... Band-shaped waste 6 ... Pressing member 8 ... Waste member 9 ... Roller 10 ... To-be-printed material M ... Affinity liquid

Claims (10)

In a screen printing method in which a printing paste applied to the surface of a screen printing plate having a predetermined pattern opening is applied from a pattern opening onto a substrate with a squeegee,
Wetting the back side of the screen printing plate containing the pattern openings with a liquid that dissolves the printing paste,
Starting printing on the substrate before the printing paste dissolving liquid is dried;
A screen printing method characterized by the above. In a screen printing method in which a printing paste applied to the surface of a screen printing plate having a pattern opening composed of a two-layer structure of a graphic part and a mesh part each having a predetermined shape is applied from a pattern opening onto a substrate with a squeegee ,
Wetting the back side of the screen printing plate containing the pattern openings with a liquid that dissolves the printing paste,
Starting printing on the substrate before the printing paste dissolving liquid is dried;
A screen printing method characterized by the above. Before the printing paste dissolving liquid is dried, the printing paste is supplied to the surface of the screen printing plate, and the surface of the screen printing plate is left covered for a predetermined time with the printing paste, and then printed on the printing material. The screen printing method according to claim 1 , wherein the screen printing method is started. 4. The screen printing method according to claim 3 , wherein the predetermined time for leaving the surface of the screen printing plate covered with a printing paste is 10 to 120 seconds. 4. The screen printing method according to claim 1 , wherein a back surface including a pattern opening of the screen printing plate is wetted with a member containing the printing paste dissolving liquid. 5. Claim 1, characterized in that wipe the back surface including a pattern opening of the screen printing plate while pressing with the pressing member cloth-like material which was free of the printing paste dissolving liquid, according to claim 2, claim 3 or claim Item 6. A screen printing method according to Item 5 . The screen printing method according to claim 1, 2, 3, 5, or 6, wherein an excess of the paste dissolving liquid for printing is wiped from the back surface of the screen printing plate. Before the printing paste dissolving liquid is dried, the printing paste is supplied to the surface of the screen printing plate to cover the surface of the screen printing plate with the printing paste,
Filling the pattern opening with a printing paste with a squeegee in a state where the back side of the screen printing plate is not in contact with the substrate, and then starting printing on the substrate;
The screen printing method according to claim 1, claim 2, claim 3, claim 5, claim 6, or claim 7 . A screen printing plate having a predetermined pattern opening;
A squeegee for applying a printing paste applied to the surface of the screen printing plate on the substrate from the pattern opening;
A liquid applying means for applying a liquid for dissolving the printing paste to a back surface including a pattern opening of the screen printing plate;
A screen printing apparatus comprising: The screen printing apparatus according to claim 9, wherein each of the pattern openings has a two-layer structure of a graphic part and a mesh part having a predetermined shape.

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