JPH0629832U - Squeegee - Google Patents

Abstract

(57) [Summary] [Object] To provide a squeegee that can effectively prevent a squeegee from falling into a through hole portion of a mask in printing a curable paste and can perform printing with high reliability. [Structure] An elastic body, and a reinforcing member 8 made of a rigid body is provided at least at the tip portion in the width direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel squeegee for printing a curable paste having conductive or insulating properties (hereinafter, simply referred to as "curable paste") on a substrate in manufacturing a circuit board. Specifically, it is a squeegee capable of printing a curable paste on a substrate with high reliability.

[0002]

[Prior art]

 As a method of printing the curable paste on the substrate, as shown in FIG. 5, (a) a mask 2 having a specific print pattern formed by the through holes 3 is brought into close contact with the surface of the substrate 1, and (b) the By supplying the curable paste 6 to the advancing side of the squeegee 4 on the mask 2 and sliding the squeegee on the mask, (c) the curable paste 6 is pushed into the through hole portion 3 of the mask 2, and (d) ) There is a method in which the curable paste 7 filled in the through holes is used to form a pattern and fill the through holes for through holes. In addition, 5 is a squeegee holder.

In such a method, the squeegee is generally made of a rubber material having elasticity because the curable paste is pushed in with a constant pressure.

[0004]

[Problems to be solved by the device]

 However, since the squeegee has elasticity, when it is slid on the mask by applying a printing pressure, the squeegee bends and falls into the through hole of the mask, and the hardenable paste on the part is scraped off. There is a phenomenon of being struck. Therefore, there is a problem in that after the curable paste is cured, a recess is formed in the above-mentioned portion. Therefore, when a circuit board pattern is formed with a conductive curable paste, disconnection may occur between the patterns formed with the curable paste, and the curable paste may be used as a through hole for through holes in the board. In the case of forming a through hole by filling, there is a problem that disconnection is likely to occur between the formed through hole and the wiring pattern. Further, such a dent phenomenon is remarkable when the area of the through hole portion of the mask is increased due to the through holes for through holes being densely packed.

[0005]

[Means for solving problems]

 The present inventors have conducted intensive research to solve the above problems using a squeegee. As a result, it is possible to effectively prevent the squeegee from falling into the through hole of the mask by providing a reinforcing material made of a rigid body in the width direction at least at the tip of the squeegee for pushing the curable paste. We found that we could print well and completed the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to these accompanying drawings.

1 to 3 are perspective views showing a typical embodiment of the squeegee of the present invention.

As the basic shape and material of the squeegee 4 of the present invention, known shapes and materials are adopted without particular limitation. 4 (a) to 4 (e) show typical aspects of a squeegee that can be preferably used in the present invention. That is, the shape of the squeegee has a rectangular cross section as shown in (a), a sword-like shape as shown in (b) to (d), and a round shape as shown in (e). Etc.

Examples of the material of the squeegee include materials having elasticity such as natural rubber, butyl rubber, chloroprene rubber, styrene-butyl rubber, nitrile rubber, neoprene rubber, silicon rubber, fluorine rubber and urethane rubber. When the squeegee is made of the above-mentioned material, a suitable hardness is generally 50 to 90 °, preferably 60 to 80 °. The hardness of the squeegee is a value measured by an F hardness meter according to JIS K-6301.

In the squeegee of the present invention, an important requirement is that a reinforcing member 8 made of a rigid body is provided in the width direction on at least the tip portion of four squeegee bodies made of an elastic body. That is, by using such a squeegee, the phenomenon that the squeegee bends and falls into the through hole of the mask can be effectively prevented by the reinforcing member 8, and the curable paste filled in the through hole of the mask is scraped off by the squeegee. It is possible to eliminate the dents after curing of the filled curable paste.

In the present invention, the rigid body is made of a material that is not deformed by printing pressure applied to the squeegee during printing without particular limitation. Typical examples are known metals such as iron, copper, nickel and aluminum, or alloys containing such metals, alumina, zirconia, cordierite, quartz, forsterite, aluminum nitride and other ceramics. Mix, plastics, wood, etc. are mentioned.

In the present invention, the reinforcing member 8 is provided at the tip portion of the squeegee 4 so as to prevent the squeegee from bending in the width direction and to prevent the flexibility in the vertical direction. The aspect is not particularly limited.

The tip portion of the squeegee means a tip portion on the side where the squeegee comes into contact with the printing mask, and the range thereof does not have a particularly strict meaning. Generally, by providing a reinforcing material, it means the range in which the curvature at the tip of the squeegee is suppressed, and the range from the tip of the squeegee is 0.2 to 50 mm, preferably 0.4 to 30 mm. It is suitable.

As a mode in which the reinforcing material is provided so as not to impede the longitudinal flexibility of the squeegee 4, as shown in FIGS. 1 to 3, it has a length that substantially covers the width of the squeegee 4. It is preferable to design so that the ratio of the width L of the reinforcing material to the length of the squeegee in the longitudinal direction is as small as possible. The width L of the reinforcing material varies depending on the size of the squeegee, the material, the shape of the reinforcing material, the material, and the like, and cannot be unconditionally limited, but it is generally preferable to determine it within the range of 1 to 30 mm. .

The squeegee is provided with a reinforcing material, as shown in FIG. 1, in which the reinforcing material 8 is fixed to the tip of the squeegee 4 opposite to the printing direction, and as shown in FIG. A preferred mode is one in which the reinforcing member 8 is incorporated inside the tip portion of the jig 4. It is preferable that the reinforcing member 8 is continuous in the width direction of the squeegee 4 as described above, but as shown in FIG. 3, it is also possible to provide the reinforcing member 8 arranged at intervals in the width direction of the squeegee 4.

Further, the reinforcing material can be constituted by a plurality of rows of the reinforcing material as long as it is provided at least at the tip portion.

Further, in the present invention, the shape of the reinforcing member 8 is not particularly limited. As typical examples, in addition to the quadrangular prism shown in FIG. 1 and the like, there may be mentioned polygonal prisms such as triangular prisms, pentagonal prisms, hexagonal prisms and cylinders, and the thickness of the above-mentioned rigid reinforcing material is Although not particularly limited, generally 1 mm or more is suitable.

The squeegee 4 of the present invention is usually held by a squeegee holder 5 for use.

The printing conditions using the squeegee of the present invention, for example, the printing pressure of the squeegee, the angle with respect to the mask, the viscosity of the curable paste, and the like can be applied under normal printing conditions without particular limitation.

[0020]

【effect】

 In the squeegee of the present invention, the squeegee body, which is made of an elastic material, has a rigid reinforcing member provided in the width direction on at least the tip portion of the squeegee body. Can be effectively prevented by the reinforcing material, and the squeegee can eliminate scraping of the curable paste filled in the through holes of the mask, and can eliminate the dent after the curable paste filled is cured. .

Therefore, the curable paste can be printed with high reliability, and in particular, when the through-hole for the through-hole of the substrate is filled with the conductive curable paste to form the through-hole, the through-hole is formed. It is possible to obtain a highly accurate circuit board with no dents.

Although the squeegee of the present invention has been described above focusing on the circuit board manufacturing method using a mask, the squeegee of the present invention can also be used in other printing in which the effects of the present invention are exhibited. .

[0023]

【Example】

 The squeegee of the aspect shown in FIG. 1 was used. That is, an iron reinforcing member having a width L of 3 mm and a depth of 3 mm, which is made of an elastic body made of urethane rubber and has a width L of 3 mm and is fixed at a position 5 mm from the tip of a squeegee body having a thickness of 8 mm, is fixed by adhesion over the entire width of the squeegee.

Using the above squeegee, printing of the curable paste was performed on a substrate having through holes for through holes according to the process shown in FIG. That is, (a) a 1.2 mm thick glass base epoxy resin laminate was used as the substrate 1, and a through hole for a through hole having a diameter of 0.4 mm was drilled by drilling. A metal mask 2 having a through hole 3 for filling a through hole was adhered and laminated on the surface of the substrate 1. (B) (c) As the curable paste 6, a commercially available copper paste is printed and filled with a printing pressure of 10 mm using the above-mentioned squeegee, and (d) a through hole portion and a through hole of the mask. A substrate in which the curable paste was filled in the through holes was obtained.

After removing the mask from the substrate, the substrate was dried in the obtained hot air drying oven under the conditions of 80 ° C., 30 minutes, 160 ° C., 90 minutes to cure the curable paste.

As a result of carrying out the above-mentioned experiment on 100 sheets, it was confirmed that the through holes obtained by curing had a good shape with no dents on both the printed surface and the opposite surface on all the substrates. It was The resistance in the through hole was 30 to 50 mΩ, and there was no disconnection between the through hole and the wiring.

[Brief description of drawings]

FIG. 1 is a perspective view showing a typical aspect of a squeegee of the present invention.

FIG. 2 is a perspective view showing a typical aspect of the squeegee of the present invention.

FIG. 3 is a perspective view showing a typical embodiment of the squeegee of the present invention.

FIG. 4 is a side view showing a typical aspect of the tip portion of the squeegee of the present invention.

FIG. 5 is a process chart showing a typical embodiment of the method of the present invention.

[Explanation of symbols]

 1 substrate 2 mask 3 through hole portion 4 squeegee 5 squeegee holder 6 curable paste 7 filled curable paste 8 reinforcing material

Claims (1)

[Scope of utility model registration request] 1. An elastic body having at least a tip portion,
A squeegee characterized in that a reinforcing material made of a rigid body is provided in the width direction.