JPH1148447A - Printing squeegee - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing squeegee not deteriorating the electrical insulating characteristics of an insulating layer even if a metal mask is used as a mask in an insulating material coating process. SOLUTION: An angling jig 4 is attached to a squeegee plate 3 to make the angle θ2 formed by the surface on the moving side of a squeegee of the part retreating from a squeegee blade and a surface to be coated smaller than a squeegee angle θ1. When this squeegee 10 is used to coat the surface to be coated of a printed wiring board 11 with paste 12 to transfer the paste to the surface to be coated of the printed wiring board, the form of the stagnation part 12a of the paste 12 is suppressed in height by the gradient surface of the angling jig 4 as compared with a case using a conventional squeegee and a mode wherein the contact quantity of the stagnated paste with the surface to be coated is increased is obtained and the paste coating efficiency of the squeegee itself is enhanced as compared with conventional one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing squeegee suitable for, for example, applying and transferring an insulating material to be an interlayer insulating layer of a multilayer printed wiring board.

[0002]

2. Description of the Related Art In various printing processes for manufacturing a printed wiring board, as shown in FIG. 6, a squeegee 31 is moved in parallel with a surface of a printed wiring board 32 via a screen mask (not shown). Thus, the paste 33 is filled in the openings of the screen mask, and the paste 33 is applied and transferred to the application surface of the printed wiring board 32.
By the way, in a printing process of applying and transferring a paste-like insulating material to be an interlayer insulating layer of a multilayer printed wiring board, it is difficult to completely embed the paste into the openings formed in the screen mask by one squeegee movement. ing.
That is, in order to apply and transfer a paste having a thickness required for an interlayer insulating layer of a multilayer printed wiring board by a single squeegee movement, for example, an insulating layer is formed on a base material or a conductor layer is formed. For example, a much higher paste application efficiency is required as compared with the case of performing normal paste application and transfer, and it is difficult to obtain such a high paste application efficiency with a normal squeegee. For this reason, as shown in FIG. 6, an application leakage portion 35 is formed, and it is necessary to take measures such as repeating the same paste application / transfer process.

[0003] Further, in the case of applying a paste-like insulating material with a squeegee, when both a squeegee and a screen mask are made of metal, abrasion occurs due to the rubbing of the two and a small amount of metal powder is removed from the paste-like insulating material. And may deteriorate the electrical insulation characteristics of the insulating layer.

[0004]

As described above, when a relatively thick insulating layer such as an interlayer insulating layer of a multilayer printed wiring board is formed, the required paste application efficiency is not satisfied by the conventional printing method using a squeegee. , Coating leakage is likely to occur. In addition, when an insulating material is applied using a metal squeegee and a mask, there is a possibility that metal powder is mixed into the insulating material and the electrical insulation characteristics of the insulating layer deteriorate.

The present invention has been made to solve the above problems, and provides a printing squeegee which is excellent in coating efficiency and is particularly suitable for forming a relatively thick insulating layer such as an interlayer insulating layer of a multilayer printed wiring board. It is an object.

Another object of the present invention is to provide a printing squeegee in which the electrical insulation characteristics of the insulating layer do not deteriorate even when a metal mask is used as a mask in the step of applying the insulating material.

[0007]

In order to achieve the above object, a printing squeegee according to the present invention has an angle between a surface of a plate-shaped squeegee retreated from a blade portion on a squeegee moving side and a surface to be coated. The squeegee angle is smaller than the squeegee angle.

In the present invention, the coating material near the squeegee during the movement of the squeegee is formed by making the angle between the surface of the plate-shaped squeegee retreated from the blade portion on the squeegee moving side and the surface to be coated smaller than the squeegee angle. Can be suppressed to a lower posture, so that the coating efficiency can be improved. For this reason, even when a relatively thick insulating layer such as an interlayer insulating layer of a multilayer printed wiring board is formed, one layer is required.
The paste-like insulating material can be completely buried in the openings formed in the screen mask by a single squeegee movement, and the productivity can be improved.

Further, in the squeegee for printing according to the present invention, in a squeegee for transferring an insulating material to a printed wiring board, at least a blade portion of the squeegee is made of an insulating material, and a surface of the plate-shaped squeegee retreating from the blade portion on the squeegee moving side. The angle between the substrate and the surface to be coated is smaller than the squeegee angle.

According to the present invention, the coating material near the squeegee during the movement of the squeegee is formed by making the angle between the surface of the plate-shaped squeegee retreated from the blade portion on the squeegee moving side and the surface to be coated smaller than the squeegee angle. Can be suppressed to a lower posture, so that the coating efficiency can be improved, and at least the blade portion is made of an insulating material, so that the squeegee and the mask are rubbed with each other to apply scattered matter. It is possible to make the contamination of the material harmless.

[0011]

Embodiments of the present invention will be described below in detail.

FIG. 1 is an external view of a printing squeegee according to an embodiment of the present invention, and FIG.

As shown in FIG. 1, this squeegee 10
A metal support 1, a squeegee plate 3 made of an insulating material, for example, a resin, which is fixed by being screwed on a plate-like portion 1 a extended from the support 1, and a plate-like portion 1 a of the support 1. And an angle jig 4 fixed with a squeegee plate 3 sandwiched between screws 2.

FIG. 3 shows a side view of the printing squeegee 10.
FIG. 1 shows a state in which a paste-like insulating material (hereinafter, simply referred to as a paste) 12 is applied to a printed wiring board 11. Although a screen mask is omitted in the figure, a screen mask provided with an opening 14 corresponding to the insulating material application region of the printed wiring board 11 is used as shown in FIG. 4, for example. By filling the paste 12 with the printing squeegee 10 in the opening 14 of the screen mask, the printed wiring board 1 is formed.
The application and transfer of the paste 12 to the application surface 1 is performed.

Here, the squeegee angle θ1 of the squeegee plate 3 (the angle θ1 on the squeegee moving side between the squeegee blade and the surface to be coated) is, for example, 70 degrees. The angulation jig 4 is added to make the angle θ2 between the surface on the squeegee moving side of the portion retracted from the squeegee blade and the surface to be coated smaller than the squeegee angle θ1. In the present embodiment, an angled jig 4 having a slope such that the angle θ2 is 40 degrees is manufactured, and the angled jig 4 is sandwiched between the squeegee plate 3 and the plate-like portion 1 a of the support 1 with the screw 2. It is fixed.

When the paste 12 is applied and transferred onto the surface of the printed wiring board 11 to be coated using such a squeegee 10, the form of the stagnant portion 12a of the paste 12 is as shown in FIG. Comparing this with the conventional squeegee having the same squeegee angle shown in FIG. 6, in the case of the present embodiment, the form of the stagnant portion 12 a of the paste 12 has a height due to the inclined surface of the angulation jig 4. Thus, the amount of contact between the staying paste and the surface to be coated is increased. As a result, the paste application efficiency of the squeegee itself is higher than that of the conventional squeegee, and application and transfer of the paste 12 can be performed satisfactorily without causing application leakage.

In this embodiment, a hard plate made of an insulating material such as resin is used as the squeegee plate 3. By using the squeegee plate 3 made of such an insulating material, it is possible to make the scattered matter generated by the friction between the squeegee and the mask into the coating material harmless.

Further, since a thick insulating layer can be easily obtained by the paste application method using the squeegee 10 of the present embodiment and the screen mask shown in FIG. 4, this thick insulating layer can be used as one wiring in a multilayer printed wiring board. It can be used as a layer. In this case, for example, as shown in FIG. 5, a conductive hole 22 is formed in the insulating layer 12 by photolithography or laser, and a through hole 25 is formed by a drill. A conductor layer 23 for connecting the upper and lower layers is formed on the inner peripheral surface of the through hole 25 by plating or the like, and a desired conductor pattern 24 is formed on the surface of the insulating layer 12 to manufacture a multilayer printed wiring board. be able to.
Furthermore, by repeatedly applying an insulating material on the conductor pattern formed on the insulating layer and performing hole processing, plating, and formation of the conductor pattern in the same manner, it is possible to manufacture a printed circuit board having a higher multilayer. .

On a rigid wiring board having a conductor pattern formed on one side, a paste-like insulating material is applied using a squeegee of this embodiment and a mask having an opening in a necessary portion of a liquid adhesive, and half-cured. After this, the rigid wiring board and the flexible wiring board with the conductor protected are heated and pressurized to be integrally formed, whereby a multilayer flex-rigid wiring board using a liquid adhesive can be manufactured.

In the present embodiment, a squeegee having a high coating efficiency in which a paste-like insulating material is applied to a printed wiring board has been described. However, the present invention is applicable not only to the case of applying an insulating material, but also to the case of applying a paste-like material. It goes without saying that the present invention can be applied to the case where any kind of material is applied.

[0021]

As described above, according to the printing squeegee of the present invention, the angle between the surface of the plate-shaped squeegee retreated from the blade portion on the squeegee moving side and the surface to be coated is smaller than the squeegee angle. As a result, the squeegee movement state of the coating material in the vicinity of the squeegee during the movement can be suppressed to a lower posture, so that the coating efficiency can be improved, and at least the blade portion is made of an insulating material. And the mask are rubbed against each other, and scattered matter generated in the coating material can be made harmless.

[Brief description of the drawings]

FIG. 1 is an external view of a printing squeegee according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the squeegee of FIG. 1;

FIG. 3 is a side sectional view showing a side surface of the squeegee of FIG. 1 in a state where a paste-like insulating material is applied to a printed wiring board;

FIG. 4 is a perspective view showing a screen mask used with the squeegee of the embodiment.

FIG. 5 is a cross-sectional view showing a multilayer printed wiring board manufactured by employing the paste application method using a squeegee of the embodiment.

FIG. 6 is a diagram for explaining a printing process using a conventional squeegee.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Support body 3 ... Squeegee plate 4 ... Angle jig 10 ... Squeegee 11 ... Printed wiring board 12 ... Paste-like insulating material 12a ... Paste staying part

Claims (2)

[Claims] 1. A printing squeegee, wherein an angle between a surface of the plate-shaped squeegee retreated from a blade portion on a squeegee moving side and a surface to be coated is smaller than the squeegee angle. 2. A squeegee for transferring an insulating material to a printed wiring board, wherein at least a blade portion is made of an insulating material, and an angle formed between a surface on the squeegee moving side of a portion of the plate-shaped squeegee retracted from the blade portion and a surface to be coated. A squeegee angle smaller than the squeegee angle.