JPS6256145A - Screen printing method - Google Patents

Abstract

PURPOSE:To enhance the efficiency of screen printing work by making it possible to perform printing by the reciprocal motion of squeezees without escaping a paste from both end parts of the squeezees, by mounting a pair of squeezees each having bent end parts mounted to both ends thereof on a screen in a opposing combination relationship. CONSTITUTION:A pair of squeezees 20 are mounted on the holding part of an automatic screen printing apparatus so that the corresponding bent end parts 22a thereof are opposed to the inside. The squeezees 20 are combined so as to be slightly levitated from a screen 3 and horizontal reciprocal motion is imparted to the squeezees 20 to apply a paste to the entire surface of the screen 3. Next, one squeezee 20 is lowered to be moved toward the other squeezee 20 with its squeezee tongue in elastic contact with a screen 3 to rub a paste 6 into the meshes of a master pattern 5 and a pattern 2 is printed on a base plate 1. At the terminating point of this forward movement, said squeezee 20 is raised and levitated while the other squeezee 20 is lowered to elastically contact the suqeezee tongue piece 21 thereof with the screen 3 and the squeezee 20 is moved in the direction reverse to that of the forward movement to rub the paste 6 into the mask pattern 5 and the pattern 2 is printed on the base plate 1.

Description

[Detailed Description of the Invention] [Summary] By mounting a pair of squeegees with bent ends at both ends facing each other, paste applied on a screen is prevented from escaping from both ends of the squeegee, To enable screen printing on the reciprocating path of the squeegee.

[Industrial application field]

The present invention relates to improvements in screen printing methods.

Screen printing methods are widely used to form thick film circuits on substrates, such as ceramic substrates.

At this time, it is desirable that the screen printing work efficiency is high.

[Conventional technology]

Figure 4 is a plan view showing the conventional screen printing method;
The figure is a side sectional view, and FIG. 6 is a perspective view of a squeegee used in conventional screen printing.

As shown in FIG. 6, the conventional squeegee 10 has a presser plate 13 fixed to the squeegee holder 12 with small screws 14 on the lower side of the squeegee holder 12, which is a horizontally elongated rectangular plate.
The squeegee tongue piece 11 is attached by being sandwiched between the squeegee holder 12 and the side surface of the squeegee holder 12.

The squeegee tongue piece 11 is an elongated rectangular plate made of a flexible plate member, such as a rubber material, and is formed into a moon shape so that the lower edge comes into elastic contact with the screen and is bent like a brush.

Further, a holding portion 12A is provided at the upper part of the squeegee holder 12 so that the squeegee 10 can be easily attached to an automatic screen printing apparatus.

In order to screen print the desired pattern 2 on the surface of the substrate 1 using the squeegee 10 as described above, first, as shown in FIGS. The size is 200 mesh), leave a part with the same shape as pattern 2 at the desired location, cover the other entire surface with resin, and place the screen 3 on which mask pattern 5 has been formed into a square shape larger than the substrate 1. The screen frame 4 is stretched, and the screen 3 is spread over the surface of the substrate l.

In addition, a plate-shaped paste return 15 with bent ends on both ends.
is attached to the holding portion of the printing device, facing the squeegee 10 attached to the automatic screen printing device.

This squeegee 10. The paste returner 15 and the paste returner 15 are respectively attached to a holding portion of the printing device so as to be movable in the vertical direction.

On the screen 3, horizontal and horizontal reciprocating motion is applied between the squeegee 10 and the paste returner 15 so as to apply the desired paste 6, and the paste 6 is applied so as to spread over the entire surface of the screen 3.

Next, the squeegee 10 is lowered, and with the squeegee tongue piece 11 in elastic contact with the screen 3, it is moved in the direction of the paste return 15 (in the direction of arrow A in the figure), and the paste 6 is applied to the mesh of the mask pattern 5. Print pattern 2 on substrate 1.

At the end of this outward path, the squeegee 10 is raised, the paste returner 15 is lowered so close that its lower edge touches the screen 3, and the squeegee 10 and paste returner 15 are moved in the opposite direction to the outward path (in the direction of arrow B). and reinstate it. On this occasion,
On the outward journey, the paste 6 scattered onto the screen 3 from both the left and right ends of the squeegee 10 is scraped up by the bent end of the paste returner 15, and spread uniformly over the entire surface of the screen 3.

The above-described operations are repeated to print and form a pattern 2 of a desired thickness on the substrate 1.

[Problem that the invention seeks to solve]

However, in the conventional screen printing method described above, the printing operation is performed only on the outward path of the reciprocating squeegee, and the return path is a process of reapplying the scattered paste, which has the problem of inefficient printing operation. Ta.

[Means for solving problems]

In order to solve the above-mentioned conventional problems, the present invention provides a pair of squeegees 20 with bent ends at both ends to prevent the paste 6 applied on the screen 3 from scattering to the left and right sides of the squeegee. With one squeegee 20 in elastic contact with the screen 3 and the other squeegee 20 floating above the screen 3, the pair of squeegees 20 are moved in the direction of the floating squeegee on the outward trip. The first printing process is carried out, and then the squeegee 20 that was floated first is brought into elastic contact with the screen 3, the squeegee 20 that was floated first is floated, and the pair of squeegees 20. and perform the second printing process on the return trip,
The above operations are repeated to form a desired pattern on the substrate 1 placed below the screen 3.

[Effect]

According to the means of the present invention, the pair of squeegees 20 include:
Since each bent end is provided, the paste 6 will not be scattered from the left and right ends of the squeegee 20 when the squeegee 20 reciprocates.

Therefore, printing can be performed on both the outward and return trips, and the screen printing operation is highly efficient.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a perspective view of a squeegee according to an embodiment of the present invention, FIG. 2 is a plan view showing the screen printing method of the present invention, and FIG. 3 is a side sectional view.

As shown in FIG. 1, the squeegee 20 used in the present invention includes a horizontally elongated rectangular plate-shaped squeegee holder 22 that is bent inward at both ends to form bent ends 22a. A presser plate 23 is fixed to the squeegee holder 22 by machine screws 24 on the lower side of the squeegee holder 22, and is sandwiched between the side surface of the squeegee holder 22 to form a bent end corresponding to the bent end 22a. A squeegee tongue piece 21 is attached.

The squeegee tongue piece 21 is an elongated rectangular plate made of a flexible plate member, such as a rubber material, and is formed into a moon shape so that the lower edge comes into elastic contact with the screen and is bent like a brush.

Further, a holding portion 22A is provided at the upper part of the squeegee holder 22 so that the squeegee 20 can be easily attached to an automatic screen printing apparatus.

In order to screen print the desired pattern 2 on the surface of the substrate 1 using the pair of squeegees 20 as described above, the second
As shown in the drawings and FIG. 3, first, a pair of squeegees 20 are attached to a holding part (not shown) of an automatic screen printing apparatus so as to face each other with bent ends 22a facing inside. In addition, this squeegee 20 has a screen 3 formed with a mask pattern 5, each of which can be moved vertically separately, stretched over a rectangular screen frame 4 larger than the substrate 1.
The screen 3 is spread over the surface of the substrate 1, the squeegee 20 is lowered onto the top of the screen, and the desired paste 6 is applied between the pair of squeegees 20, and the squeegee 20 is slightly raised above the screen 3 to assemble. In this state, the squeegee 20 is given horizontal reciprocating motion to apply the paste 6 to the entire surface of the screen 3.

Next, one squeegee 20 is lowered, and with its squeegee tongue piece 21 in elastic contact with the screen 3, the other squeegee 20 is moved in the direction (in the direction of the arrow in the figure), and the paste 6 is applied to the mesh of the mask pattern 5. pattern 2 on board 1.
print.

At the end of this outward journey, raise and float the previous squeegee 20,
Lower the other squeegee 20 and remove the squeegee tongue piece 21.
While in elastic contact with the screen 3, the paste 6 is moved in the direction opposite to the forward path (in the direction of arrow B in the figure), and the paste 6 is applied to the mesh of the mask pattern 5, thereby printing the pattern 2 on the substrate 1.

The above-described operation is repeated to print and form a pattern 2 of a desired thickness on the substrate l, and a pair of squeegees 20
Since each squeegee tongue piece 21 is provided with a bent end, the paste 6 does not scatter from the left and right ends of the squeegee 20 during reciprocating movement of the squeegee 20, and is prevented from being deposited between the pair of squeegees 20. maintained in the state.

Therefore, printing can be performed on both the outward and return trips, and the screen printing operation is highly efficient.

〔Effect of the invention〕

As explained above, in the present invention, by combining a pair of squeegees having bent ends at both ends facing each other and mounting them on a screen, the paste applied on the screen is dissipated from both ends of the squeegees. Never. Therefore,
Printing can be performed both during the reciprocating motion of the squeegee, and the screen printing operation is highly efficient, which is an excellent practical effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a squeegee according to an embodiment of the present invention, FIG. 2 is a plan view showing the screen printing method of the present invention, FIG. 3 is a side sectional view showing the screen printing method of the present invention, and FIG. 5 is a plan view showing a conventional screen printing method, FIG. 5 is a side sectional view, and FIG. 6 is a perspective view of a squeegee used in conventional screen printing. In the figure, 1 is a substrate, 2 is a pattern, 3 is a screen, 4 is a screen frame, 5 is a mask pattern, 6 is a paste, 10.20 is a squeegee, IL21 is a squeegee tongue piece, 12.22 is a squeegee holder, 12Δ, 22A is a holding portion, 22a is a bent end portion, and 13.23 is a holding plate. Side 5 Figure

Claims (1)

[Claims] In order to prevent the paste (6) applied on the screen (3) from scattering to the left and right sides of the squeegee, a pair of squeegees (20) with bent ends at both ends are attached to the screen. (
3) are installed facing each other above, one of the squeegees (20) is in elastic contact with the screen (3), and the other squeegee (20) is floating, and the pair of squeegees (20) are floated. The squeegee moves in the direction of the squeegee and performs the first printing process on the outward path. Next, the squeegee (20) that was floated earlier is made to come into elastic contact with the screen (3), and the squeegee (20) that was earlier brought into elastic contact is
Float the pair of squeegees (2
0), perform a second printing process on the return trip, and repeat the above operations to form a desired pattern on the substrate (1) placed below the screen (3). Method.