JP5960510B2 - Screen printing squeegee - Google Patents

Description

  The present invention relates to a screen printing squeegee.

  A screen printing method is used as a method of forming electrodes or the like having a predetermined pattern on a substrate such as a substrate. In this screen printing method, a substrate is covered with a screen made of a resin or metal having a predetermined pattern, and a screen printing squeegee is slid to print a paste supplied on the screen onto the surface of the substrate. It is.

  And as squeegee for screen printing used for such screen printing, as described in Patent Document 1, it is made of rubber having elasticity, or as described in Patent Document 2, rubber and A structure in which the metal plate is bonded and the sliding portion on the screen is made of rubber, or a structure in which the rubber and the metal plate are bonded together as described in Patent Document 3, and the sliding on the screen is performed. The thing which made the moving part metal was proposed.

JP 2000-62140 A Japanese Patent Laid-Open No. 10-086327 Japanese Utility Model Publication No. 07-011338

  However, as described in Patent Documents 1 and 2, when the sliding part on the screen is rubber, high printing quality is obtained, but the sliding part is easily worn, so the replacement frequency is high, and production There was a problem of low efficiency. Further, as described in Patent Document 3, when the sliding portion on the screen is a metal, the amount of wear is greatly improved as compared to rubber, but in recent years, the amount of wear is further smaller and the amount of wear is reduced. There is a need for a screen printing squeegee capable of high-quality printing over a long period of time without reducing production efficiency.

  The present invention has been devised to satisfy the above requirements, and an object of the present invention is to provide a screen printing squeegee that can be printed with high quality over a long period of time with less frequent replacement due to wear.

Screen printing squeegee of the invention, the squeegee made of urethane resin, Ri name is combined zirconia sintered body is bonded, ridge corners is the distal end of the zirconia sintered body, and the sliding part on the screen it is and is characterized that you have provided a recess in the ridge corner.

  According to the squeegee for screen printing of the present invention, since the zirconia sintered body is bonded to the urethane resin, the replacement frequency due to wear is low, and high-quality printing is possible over a long period of time.

An example of the squeegee for screen printing of this embodiment is shown, (a) is a front view, (b) is a side view. (A) of the S section shown in FIG. 1 is an enlarged front view, and (b) is a cross-sectional view taken along line X-X ′ in (a).

  Hereinafter, an example of the screen printing squeegee of this embodiment will be described.

  1A and 1B show an example of a screen printing squeegee according to the present embodiment, in which FIG. 1A is a front view and FIG. 1B is a side view. The squeegee for screen printing 1 of the embodiment of the example shown in FIG. 1 has a zirconia sintered body 3 bonded to the front end portion side of one main surface of the urethane resin 2 so as to protrude from the urethane resin 2. Is.

  The screen printing squeegee 1 of this embodiment having such a configuration applies the paste to a predetermined pattern formed on the screen while suppressing the lifting of the screen by the urethane resin 2 being bent by the pressure during printing. Since the zirconia sintered body 3 having high strength and toughness and excellent wear resistance is bonded together, even if printing is repeated, the wear is low and the replacement frequency is low. Cost can be reduced. And by comprising the composite member of the urethane resin 2 and the zirconia sintered body 3, it is possible to print with high quality over a long period of time.

  And in the squeegee 1 for screen printing of this embodiment, it is preferable that the zirconia sintered body 3 is bonded to the front end side of one main surface of the urethane resin 2 so as to protrude from the urethane resin 2. .

  Moreover, it is preferable that the thickness of the zirconia sintered compact 3 is 0.1-0.3 mm so that the bending of the urethane resin 2 by the pressure at the time of printing can be tracked.

  2A is an enlarged front view of part S shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line X-X ′ in FIG.

  According to the squeegee for screen printing of the present embodiment, the ridge line corner A which is the tip of the zirconia sintered body 3 is a sliding portion on the screen, and the ridge line corner A is provided with the recess D. Preferably it is. Thus, by providing the ridge line corner portion A with the concave portion D, the concave portion D serves as a paste holding portion, and fading of the paste during printing can be prevented.

And it is preferable that the magnitude | size of this recessed part D is 100 micrometers or less in the dimension of the horizontal (width) direction in the illustration surface of Fig.2 (a). Moreover, it is preferable that the depth of this recessed part D is 40 micrometers or less by the dimension of the depth in the illustration surface of Fig.2 (a) (lateral direction in the illustration surface of FIG.2 (b)). Further, it is preferable that about 15 or less of the concave portions C exist in the ridge line corner portion A per 1000 μm in the width direction.

  Next, an example of a method for manufacturing the screen printing squeegee of this embodiment will be described.

First, an organic binder is added to zirconium oxide powder and mixed and entrained to obtain a clay. And using this clay, it shape | molds with the extrusion molding apparatus which can shape | mold a predetermined | prescribed cross-sectional shape continuously, and a molded object is obtained. Alternatively, a sheet formed by a doctor blade method or a roll compaction method using granules obtained by spray drying a slurry obtained by adding an organic binder or the like to zirconium oxide powder, or a sheet obtained here May be punched out with a mold to obtain a molded body. Next, in the air atmosphere, firing at a maximum temperature of about 1400 ℃, after firing,
A zirconium-based sintered body is obtained by grinding and polishing. At this time, the thickness of the zirconium-based sintered body is, for example, 0.1 to 0.3 mm.

  Also, by preparing urethane resin with a Shore hardness of 80, and pasting the zirconia sintered body with an epoxy-based adhesive so that it protrudes more than the urethane resin on the leading end side of one main surface of the urethane resin The screen printing squeegee of this embodiment can be obtained. At this time, the protruding length of the zirconia sintered body from the urethane resin is, for example, 2 to 4 mm.

  In addition, in order to provide the concave portion D in the ridge line corner portion A which is the tip of the zirconia sintered body 3, the molded body is fired at a maximum temperature of about 1300 ° C., and after grinding, grinding and polishing are performed again. The firing may be performed at a maximum temperature of about 1400 ° C. In addition, the screen printing squeegee obtained by this method has a better familiarity and can reduce the number of trial printings until the start of printing.

  Examples of the present invention will be specifically described below, but the present invention is not limited to these examples.

  Squeegee A made of urethane resin, squeegee B bonded with metal so that it protrudes more than urethane resin on the screen made of metal, and on the leading end side of one main surface of urethane resin, than urethane resin Using the squeegee C in which the zirconia sintered body was stuck so as to protrude, a test was repeated 1000 times to confirm the print quality and the wear of the sliding part.

  For the squeegee A, the print quality was the best, but in the squeegees A to C, the wear of the sliding portion was the largest. Next, although the squeegee B had good printing quality, the sliding portion was smaller than the squeegee A but was worn larger than the squeegee C. On the other hand, the squeegee C has the same print quality as the squeegee B, and the sliding portion was hardly worn. As described above, it was found that the squeegee C, which is the screen printing squeegee of this embodiment, has a low replacement frequency due to wear and can reduce maintenance costs, and can perform high-quality printing over a long period of time.

1: Screen printing squeegee 2: Urethane resin 3: Zirconia sintered body A: Ridge corner D: Concavity

Claims (2)

A squeegee made of urethane resin, Ri name is combined zirconia sintered body is bonded, ridge corners is the tip of the zirconia sintered body, which is a sliding portion on the screen, the ridge corners screen printing squeegee characterized that you have with a recess. 2. The zirconia sintered body is bonded to a distal end side of one main surface of the squeegee made of urethane resin so as to protrude from the squeegee made of urethane resin. Squeegee for screen printing.

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