JP2012224014A - Molding method of opening contour section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of suppressing print smear upon printing ink paste and glue or the like to a printed surface having irregularities by using a printing stencil plate.SOLUTION: The periphery of an opening contour of the stencil type printing stencil plate is curved toward the printed surface side to improve adhesiveness.

Description

The present invention relates to a method of forming a shape in the vicinity of an opening contour of a printing stencil.

When printing printing materials such as inks, pastes and glues using a stencil type printing metal plate stencil, if there is irregularities on the surface of the printed material, the adhesion with the printing stencil is impaired, so squeegee etc. from the top When rubbing with, the bleeding into the gap formed between the lower surface of the stencil and the surface of the printing material tends to occur.

For this reason, instead of the conventional stencil printing plate using a metal plate, printing is increasingly performed with a stencil made of a resin sheet that can easily adhere to unevenness and reduce bleeding.

In addition, when the printing material bleeds and spreads in the gap between the stencil bottom surface and the surface of the printing material, the mechanism that tries to pull the printing material in the opening into the gap works when the plate is separated after spreading. The mechanism of reducing this mechanism by dividing it by a fine groove as in Reference 1 has been devised.

However, this is because when the printing material contains pigment particles or conductive particles that are finer than the groove width, the particles are gradually filled into the groove, and the original groove has a “break-off mechanism”.・ There was a drawback that the “reduction effect” was lost.

As another measure for preventing bleeding, as shown in Reference 2, a protrusion is formed on the contour of the opening of the printing stencil to surround the opening, and the gap generated between the stencil and the surface of the printing material is removed. There was also an idea to prevent the printing material from seeping out, and a certain effect was obtained at the time of filing.

However, this method is effective only for ablation processing using an excimer laser or the like and lacks versatility. Therefore, this method is not only applicable to other opening methods that have appeared since then, but with subsequent printing miniaturization. Since the distance between adjacent printing designs continues to be close, this level of bleeding suppression effect is not sufficient.

A decrease in printing resolution due to bleeding as described above leads to blurring of a printed image, and when this printing material is a conductive paste or the like, it causes a problem such as a short circuit.

JP-A-10-151873 Japanese Patent Laid-Open No. 11-320164

In order to solve the above-described problems, a method for forming a peripheral shape of an opening that can suppress the bleeding of the printing material into the gap between the opening of the printing stencil and the surface of the uneven printing material, and the method A printing stencil by the method is provided.

According to the first aspect of the invention, the periphery of the opening outline of the stencil type printing stencil is curved toward the printing surface, and the gap through which the printing material exudes from the opening is reduced.

In the invention of claim 2, the periphery of the opening contour of the printing stencil of claim 1 is pressed by sandwiching the curved shape from both the front and back sides with the approximate concave and convex pressing dies, A curved shape is transferred and formed by plastic deformation.

In the invention according to claim 3, the periphery of the opening contour of the printing stencil according to claim 1 is pressed by sandwiching the curved shape from the front and back surfaces with the approximate concave and convex pressing dies, Further, the stencil is heated by heating the mold to transfer and form a curved shape.

In the invention of claim 4, the edge tip of the opening of the stencil having a curved shape formed around the opening contour of the printing stencil of claim 2 or 3 is further parallel to the plane of the printing surface. Chamfer.

In the invention described in claim 5, the stencil printing plate material described in claims 1 to 4 is a metal plate.

In the invention described in claim 6, the stencil plate material for printing described in claims 1 to 5 is a resin plate.

In the invention according to claim 7, the periphery of the opening contour of the printing stencil according to claims 1 to 6 is curvedly formed within a range of 2 mm from the opening contour.

In the invention according to claim 8, the periphery of the opening contour of the printing stencil according to claims 1 to 6 is curved and formed at a height within 0.5 mm from the stencil plane.

Conceptual diagram of printing on uneven surface with conventional stencil type stencil Conceptual diagram of printing on uneven surface by printing stencil according to the present invention Conceptual diagram of bending process for printing stencil according to the present invention Conceptual diagram of chamfering of opening edge of printing stencil according to the present invention

FIG. 1 is a conceptual diagram of printing on an uneven surface using a conventional stencil-type printing stencil. In this figure, when the surface of the printing surface is uneven, even if the stencil position is slightly shifted, the stencil opening is separated from the convex portion arranged on the printing surface and a gap is generated between the printing surface and the printing surface. . In this state, when the printing material is rubbed from the upper surface of the stencil with a filling means such as a squeegee, the printing material is pushed out from the gap, and bleeding occurs.

In particular, when the openings are close to each other and the printing material oozes out from both sides, the printing design of the two comes into contact with each other, degrading the printing resolution, and the electronic component bonding paste or the electronic circuit forming conductive material. In the case of printing of the adhesive paste, it becomes a cause of trouble such as an electrical short circuit.

Therefore, if the periphery of the opening contour of the stencil is curved toward the printing surface as shown in FIG. 2, even if the opening is displaced from the convex portion of the printing surface to the concave portion, the stencil oozes more than the conventional stencil. It can be reduced.

Therefore, in order to form such a curved shape around the outline of the opening of the printing stencil, a pair of male and female dies having curved surfaces that sandwich the opening of the stencil from both the front and back sides as shown in FIG. 3 is used. Thus, molding by plastic deformation can be performed by sandwiching the periphery of the opening outline of the stencil.

Further, by using a heating means in combination with the molding die shown in FIG. 3, it is possible to easily form a curved stencil made of a metal plate, and to provide an annealing effect.

In particular, in the case of curve formation with a stencil using a thermoplastic resin plate, it is sandwiched from both the front and back surfaces with a mold for bending while selecting and heating an appropriate temperature from the glass transition temperature to the melting point temperature. It is possible to form a curve using thermal deformation by opening the mold after cooling while maintaining the above.

Regardless of whether the material of the stencil is metal or resin, the procedure for opening and bending is the same as that of the opening means such as drill, punch, milling, broaching, sandblasting, water jet, thermal laser, laser for ablation, etching, etc. It is only necessary to decide which is preceded in consideration of the characteristics.

When drilling by machining, the peripheral portion of the opening is sandwiched by a pressing member for preventing fluttering of the workpiece material, so that the pressing member has the shape of the curved mold as described above. It is also possible. In this case, even in the case of the nibbling opening, a curved shape can be imparted around the contour.

FIG. 4 is a conceptual view of a cross section obtained by chamfering the opening edge of the printing stencil. If the material of the stencil is a hard metal, the printed surface may be damaged by the edge of the contour of the curved opening, so it is good to chamfer the printed surface in parallel to prevent damage. .

Also, when printing a large number of times, or when using a stencil with a resin plate that is less durable than metal, the sharp edges will wear away as the product is used, and the print amount and print quality will gradually change. Therefore, it is preferable to chamfer in order to suppress a change with time and maintain a stable print quality.

The present invention can suppress the occurrence of defects due to oozing in the application of conductive paste when mounting electronic components, etc., so that it becomes possible to manufacture higher quality electronic devices and reduce the cost of handling defects. I can do it.

DESCRIPTION OF SYMBOLS 1 Printing stencil 2 Printing material 3 Convex part of to-be-printed object surface 4 To-be-printed object 5 Exuded printing material 6 Curved part around opening outline 7 Curved male mold 8 Curved female mold 9 Opening edge Chamfered part

Claims (8)

A method for producing a printing stencil and its printing stencil, characterized in that the periphery of the opening outline of the stencil type printing stencil is curved toward the printing surface. 2. The stencil printing plate according to claim 1, wherein the shape of the curved shape to be curved is pressed with the approximate concave and convex pressing molds sandwiching the periphery of the opening from both the front and back surfaces, and the curved shape is formed by plastic deformation. A method for producing a printing stencil and a printing stencil characterized by forming the printing stencil. The printing stencil according to claim 1, wherein the periphery of the opening is sandwiched and pressed between the front and back surfaces of the approximate concave and convex pressing molds in a shape to be curved, and the mold is heated by heating. A method for producing a printing stencil, wherein the curved shape is transferred by heating the stencil, and the printing stencil. 4. The printing stencil according to claim 2 or 3, wherein the edge tip of the stencil opening formed with a curved shape around the outline of the opening is chamfered in parallel with the plane of the printing surface. Stencil manufacturing method and printing stencil. A method for producing a printing stencil and a printing stencil thereof, wherein the plate material of the printing stencil according to claim 1 is a metal plate. A method for producing a printing stencil and a printing stencil thereof, wherein the plate material of the printing stencil according to claim 1 is a resin plate. The curved shape formed in the periphery of the opening outline of the printing stencil according to claim 5 to 4 is formed in a range within 2 mm from the edge of the opening. Preparation method and printing stencil. 5. The printing stencil according to claim 1, wherein the height of the formed curve is a maximum of 0.5 mm from the stencil plane portion, and the method Stencil for printing.