JPH07305Y2 - Print screen structure - Google Patents

Description

Detailed Description of the Invention [Outline] A mesh screen having an outer peripheral portion attached to a frame and having an opening in the center, and an outer peripheral portion attached to the back side of the peripheral edge of the opening of the mesh screen with an adhesive. Regarding the combination type printing screen equipped with a metal mask, for the purpose of increasing the durability of the printing screen by preventing the peeling of the adhesive between the metal mask and the mesh screen, An adhesive overcoat portion is provided so as to cover the entire periphery of the opening.

[Industrial application field]

The present invention relates to the structure of a printing screen used in an automatic printing device for solder cream or the like. The present invention relates to an improvement in the structure of a combination type printing screen having a metal mask attached to the back side of the peripheral edge of the section with an adhesive.

In a combination type printing screen in which a mesh screen and a metal mask are combined, it is possible to prevent the adhesive portion between the peripheral edge portion of the opening formed in the mesh screen and the metal mask from being peeled off to improve durability. It is necessary to raise it.

[Conventional technology]

An automatic printing device for screen-printing solder cream or the like on a surface-mounted printed wiring board is a printing screen that is superposed on the printed surface of the printed wiring board and a printing agent (solder cream) via the printing screen. )
And a squeegee (printing plate) for imprinting on the printed surface of the printed wiring board. In this type of automatic printing device, it is necessary to stabilize the amount of printing agent applied to the surface to be printed, so conventionally, a combination type printing screen that combines a mesh screen and a metal mask has been used. There is.

FIG. 3 shows the structure of a conventional combination type printing screen. Referring to the figure,
The printing screen includes a rectangular frame 1 having an opening inside, a mesh screen 2 made of an elastic synthetic resin, and a metal mask 3 having a print pattern formed thereon. The outer periphery of the mesh screen 2 is bonded to the back surface of the frame 1. The metal mask 3 is fixed by an agent or the like, and the metal mask 3 is superposed on the back surface of the central portion of the mesh screen 2, and the outer peripheral edge portion thereof is bonded to the back surface of the mesh screen 2 by an adhesive agent 4. After the metal mask 3 is bonded to the mesh screen 2, the mesh screen 2 inside the bonded portion is cut off to form the opening 2a in the mesh screen 2.

The printing screen is washed and then set in an automatic printing device for use.

In such a combination type printing screen, since the mesh screen 2 having elasticity can apply a uniform tension to the metal mask 3, it is possible to stabilize the amount of printing agent applied during printing.

[Problems to be solved by the device]

In the conventional combination type printing screen described above, the cleaning liquid penetrates through the openings 2a of the mesh screen 2 into the bonding portion between the mesh screen 2 and the metal mask 3 during cleaning, and the mesh screen 2 and the metal mask 3 The adhesive force between the metal mask 3 and the mesh screen 2 easily separates because the squeegee (printing plate) hits the peripheral edge of the opening 2a of the mesh screen 2 during printing. As a result, there has been a problem that the printing screen cannot withstand long-term use.

Therefore, an object of the present invention is to prevent the peeling of the adhesive portion between the metal mask and the peripheral portion of the opening of the mesh screen to enhance the durability of the printing screen.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention provides a mesh screen having an outer peripheral portion attached to a frame and having an opening in the center, and an outer peripheral portion attached to the back side of the peripheral edge of the opening of the mesh screen with an adhesive. In the structure of the printing screen including the metal mask, an overcoat portion of an adhesive is provided on the front side of the mesh screen so as to cover the peripheral edge of the opening over the entire circumference.

[Action]

In the printing screen having the above structure, the cleaning liquid can be prevented from entering the bonding portion between the peripheral portion of the opening of the mesh screen and the surface of the metal mask by the adhesive overcoat portion during cleaning. At the same time, it is possible to prevent the squeegee for printing from hitting the periphery of the opening of the mesh screen by the overcoat portion, so that the peeling of the adhesive portion between the periphery of the opening of the mesh screen and the metal mask is prevented. can do. Therefore, the durability of the printing screen can be improved.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show the structure of a printing screen according to an embodiment of the present invention. Referring to these drawings, the combination type printing screen is, for example, a stainless steel sheet in which a rectangular frame 11 having an inner opening, a mesh screen 12 made of elastic synthetic resin such as Tetron, Teflon, and a printing pattern 13a are formed. And a metal mask 13 consisting of.

As shown in FIG. 2, the outer peripheral portion of the mesh screen 12 is fixed to the back surface of the frame 11 with an adhesive or the like. An opening 12a is formed in the center of the mesh screen 12, and the outer peripheral portion of the surface of the metal mask 13 is formed on the back side of the peripheral edge of the opening 12a of the mesh screen 12 with, for example, an epoxy adhesive 14
It is pasted all around.

As a method for obtaining such a bonded structure of the mesh screen 12 and the metal mask 13, after the outer peripheral edge portion of the surface of the metal mask 13 is bonded to the back surface of the mesh screen 12 with the adhesive 14, the adhesive Cut the mesh screen 12 inside the bonded part by 14 and cut the mesh screen
A method of forming the opening 12a in 12 can be adopted. In this case, the peripheral edge of the opening 12a of the mesh screen 12 can be completely bonded to the metal mask 13 by the adhesive 14 at a position where the adhesive 14 cuts into the bonded portion before the adhesive 14 is cured, and the mesh screen 12 is cut off. Can be done easily.

As shown in FIGS. 1 and 2, the mesh screen 12
An overcoat portion 15 made of, for example, an epoxy adhesive is provided on the front side of the mesh screen 12 so as to cover the boundary between the peripheral edge of the opening 12a of the mesh screen 12 and the metal mask 13 over the entire circumference. In order to surely cover the peripheral portion of the opening of the mesh screen 12, as shown in the figure, the adhesive overcoat portion 15 may be formed by overlaying the front side of the mesh screen 12 to the surface of the metal mask 13. preferable.

After forming the opening 12a in the mesh screen 12 in advance, the outer peripheral portion of the surface of the metal mask 13 is attached with the adhesive 14 along the peripheral edge of the opening 12a, and the opening 12a is continuously formed.
You may make it provide the overcoat part 15 of an adhesive agent in the peripheral part.

The combination type printing screen having the above structure is washed and set in an automatic printing device for use.

In such a combination type printing screen, since the mesh screen 12 having elasticity can apply uniform tension to the metal mask 13, it is possible to stabilize the amount of printing agent applied during printing.

In the printing screen having the above-mentioned configuration, the cleaning liquid is prevented from entering the bonding portion between the peripheral portion of the opening 12a of the mesh screen 12 and the surface of the metal mask 13 by the adhesive overcoat portion 15 at the time of cleaning. In addition, it is possible to prevent the squeegee (printing plate) from hitting the periphery of the opening 12a of the mesh screen 12 in the overcoat part
Since it can be prevented by 15, it is possible to prevent the adhesive portion between the peripheral edge of the opening 12a of the mesh screen 12 and the metal mask 13 from peeling off. Therefore, the durability of the printing screen can be improved.

Although the illustrated embodiment has been described above, the present invention is not limited to the embodiment described above, and various modifications can be made to the shape of each component.

[Effect of device]

As is apparent from the above description, according to the present invention, since the peripheral edge of the opening of the mesh screen is covered with the overcoat portion of the adhesive, the cleaning liquid is washed with the peripheral edge of the opening of the mesh screen when the printing screen is washed. It is possible to prevent the intrusion into the adhesive portion between the portion and the surface of the metal mask, and it is possible to prevent the squeegee for printing from hitting the peripheral edge of the opening portion of the mesh screen by the overcoat portion. Therefore, it is possible to prevent the adhesion portion between the peripheral portion of the opening of the mesh screen and the metal mask from being peeled off, and it is possible to provide a printing screen with high durability.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a printing screen showing an embodiment of the present invention, and FIG. 2 is a printing screen shown in FIG.
FIG. 3 is an enlarged cross-sectional view of the main part taken along line II, and FIG. 3 is a cross-sectional view showing the structure of a conventional printing screen. In the figure, 11 is a frame, 12 is a mesh screen, 12a is an opening, 13 is a metal mask, 14 is an adhesive, and 15 is an adhesive overcoat.

Claims (1)

[Scope of utility model registration request] 1. A mesh screen (12) having an outer peripheral portion attached to a frame (11) and having an opening (12a) in a central portion.
And the outer periphery is the opening (12) of the mesh screen (12).
In a structure of a printing screen having a metal mask (13) adhered to the back side of the peripheral edge of (a), an opening (12a) is provided on the front side of the mesh screen (12).
The structure of the printing screen is characterized in that an overcoat portion (15) of an adhesive is provided so as to cover the peripheral portion of the entire circumference of the printing screen.