JPH1016424A - Printing mesh screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mesh screen which can reduce the number of times of printing of thick film paste. SOLUTION: A printing mesh screen which prints paste on a substance to be printed by sticking a stencil film on which a printing pattern is formed to one metal thin plate 10, opening parts 11a, 11b, 11c which are different in the discharge of the paste corresponding to the thickness of a paste film to be printed on the substance are provided. In the opening parts 11a, 11b, 11c formed in a sheet of mesh screen, the opening area increases with an increase in the thickness of the paste film to be printed on the substance, and the discharge of the paste per unit area is made to increase. By forming the opening parts having different opening areas corresponding to the thickness of the film to be printed in one mesh screen, the paste of different film thickness can be printed at a time by printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing mesh screen used for printing a thick-film printing paste such as a resistive paste, a metal paste, a glass paste, and a resin paste on a printed material such as a printed circuit board.

[0002]

2. Description of the Related Art Printing of a thick film paste such as a resistance paste, a metal paste, and a glass paste is performed by screen printing in which a paste placed on a printing screen is filled with a squeegee into the eyes of the screen and transferred to a substrate. Is common. A stencil film (a film serving as a seal for providing a portion that does not allow the paste to pass) is attached as a mesh screen used for this screen printing to form a necessary pattern on the mesh screen made of plain woven resin fibers and metal wires. In addition, a stencil film is attached to a metal screen or a mesh screen having an opening formed in a thin metal plate.

The stencil film is formed of an emulsion containing polyvinyl alcohol as a main component or a metal foil such as stainless steel or nickel, and a pattern opening to be printed on the stencil film is formed by etching or the like. Then, the paste passes through the pattern openings formed in the stencil film and the openings of the mesh screen, and is printed on a substrate such as a substrate.

FIG. 6 shows an example of a conventional mesh screen. As shown in FIG. 6A, a mesh screen having a structure in which an opening 1 is formed by plain weaving with a wire 2 or as shown in FIG. Formed mesh screens are known, and the opening areas of the openings 1 provided in these mesh screens and the intervals between the openings are all equal.

[0005]

By using a mesh screen having such a structure, a paste layer having a planar structure as shown in FIG. 5A and a cross-sectional structure as shown in FIG. When the paste 5 is to be printed on the top, as shown in FIGS. 4A, 4B and 4C, a stencil film 7a for preventing the paste from passing therethrough, At least three types of mesh screens on which patterns 6a, 6b, and 6c are formed by pasting 7b and 7c and transmitting the paste 5 are required,
Also, the number of times of printing must be three or more. The present invention has been made in view of the above problems, and proposes a mesh screen that can reduce the number of times of printing.

[0006]

The printing mesh screen of the present invention is provided with openings on a single mesh screen having different paste discharge amounts in accordance with the thickness of the paste to be printed on the substrate. Thus, the paste can be printed on the substrate by one printing screen with one mesh screen.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which paste layers 5 having different film thicknesses, such as range A, range B, and range C shown in FIG. And FIG.
This will be described with reference to FIG. As shown in FIG. 3, the mesh screen 9 made of a single stainless steel sheet metal has a range in which pastes having different thicknesses are printed on the substrate, except for a portion where the stencil film 8 is attached. An opening having a different paste discharge amount according to the paste film thickness of b and the range c, that is, an opening having a different opening area according to the paste film thickness is provided.

[0008] When corresponding to the paste film thickness of the cross section of the paste film thickness as shown in FIG.
The opening 11 having the smallest opening area as shown in FIG.
a is provided on one sheet of metal sheet 10.

The mesh screen 9 has an opening having a larger opening area than the range A as shown in FIG. 1B in a portion B where a paste thicker than the range A is printed. The part 11b is provided on the same one sheet metal 10.

Further, the mesh screen 9 has an opening 11c having the largest opening area as shown in FIG.
Are provided on the same single sheet metal sheet 10. And
In one mesh screen 9 having the different opening areas, as the opening area of the opening increases, the amount of paste discharged per unit area increases, so that the paste film thickness can be printed thicker.

By changing the opening area of the opening provided in one mesh screen 9 as described above, it is possible to adjust the discharge amount of the paste passing through the opening per unit area. Therefore, by changing the opening area of the opening in accordance with the thickness of the paste printed on the substrate, the paste having a plurality of film thicknesses to be printed on the substrate can be performed by one printing using a single mesh screen. it can.

In the above embodiment, the opening area of the opening provided in the mesh screen is changed. However, as another embodiment, as shown in FIG. 2, the opening area of the opening is made equal, and the spacing between the openings is changed. The discharge amount of the paste can be adjusted by changing.

In the case of this embodiment, FIG.
In the order shown in FIG. 2B and FIG. 2C, the interval between the openings 13 of one sheet metal plate 12 having the same opening area is reduced. Since the discharge amount of the paste per unit area increases as the interval between the openings 13 decreases, the paste having a plurality of film thicknesses to be printed on the substrate is printed by one mesh screen by one printing. Can be.

In each of the above embodiments, the discharge area of the paste per unit area is adjusted by changing the opening area of the opening or by changing the interval between the openings having the same opening area. The discharge amount may be adjusted by changing both of the intervals between the sets. Further, the discharge amount may be adjusted by changing the thickness distribution of one mesh screen. In the above embodiment, a thin metal plate made of stainless steel is used as one mesh screen, but a single mesh screen in which resin fibers and metal wires are plain-woven may be used. When this mesh screen is used, the area of the openings and the spacing between the openings can be changed during plain weaving.

[0015]

According to the mesh screen for printing of the present invention, pastes having different thicknesses can be printed by one printing on one mesh screen.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a first embodiment of an opening of a printing mesh screen of the present invention.

FIG. 2 is a plan view of a main part of an opening of a printing mesh screen according to a second embodiment of the present invention.

FIG. 3 is a plan view of the printing mesh screen of the present invention.

FIG. 4 is an explanatory diagram of screen printing using a conventional printing mesh screen.

FIG. 5 is a plan view and a cross-sectional view of a film thickness of a paste printed on a substrate.

FIG. 6 is a plan view of a main part of a conventional printing mesh screen.

[Explanation of symbols]

9 Mesh screen 10, 12 Metal sheet 11a, 11b, 11c, 13 Opening of mesh screen

Claims (5)

[Claims] 1. A printing mesh screen in which a stencil film on which a printing pattern is formed is pasted and a paste is printed on an object to be printed. A mesh screen for printing, comprising openings having different paste discharge amounts. 2. A printing mesh screen in which a stencil film on which a printing pattern is formed is pasted and a paste is printed on a printing material, wherein a single mesh screen is used in accordance with the thickness of the paste printed on the printing material. A mesh screen for printing, comprising openings having different opening areas. 3. A printing mesh screen in which a stencil film on which a printing pattern is formed is pasted and a paste is printed on a printing material, wherein a mesh screen is printed on a single mesh screen according to the thickness of the paste printed on the printing material. A mesh screen for printing, comprising openings having an equal opening area and different intervals. 4. A printing mesh screen in which a stencil film on which a printing pattern is formed is pasted and a paste is printed on a printing material, wherein the mesh screen is printed on a single mesh screen in accordance with the thickness of the paste printed on the printing material. A printing mesh screen comprising: an opening having a different opening area; and openings having an equal opening area and different intervals according to a thickness of a paste printed on the printing medium. 5. A printing mesh screen in which a stencil film on which a printing pattern is formed is pasted and a paste is printed on a printing medium, wherein a thickness distribution of one mesh screen is printed on the printing medium. A mesh screen for printing, characterized in that it is changed according to the following.