JP6454396B1 - Screen printing squeegee device and screen printing machine equipped with the squeegee device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a squeegee device for screen printing and a screen printing machine which achieves both a sound transfer of a high-viscosity printing agent and a good separation of a screen plate while having a simple structure. A squeegee device 1 for screen printing according to the present invention includes a squeegee body 2 having a contact portion 2b with a screen plate 4 at a lower end portion 2a, and a contact portion 2b of the squeegee body 2 behind the squeegee body 2. A gas injection means 3 having an injection port 3a at a higher level is provided, and gas is injected from the injection port 3a of the gas injection means 3 toward the contact portion 2b of the squeegee body 2. [Selection] Figure 2

Description

  The present invention relates to a squeegee device that presses a printing agent against a through-hole of a screen plate in screen printing in which a printing agent such as ink or solder cream is transferred to a printing material through a through-hole provided in the screen plate in advance. It is related with the printing machine provided with.

  First, in this document, the term “screen printing” is used only when the screen plate is kept in close contact with the substrate, and when the screen plate is pressed with a squeegee device. It is used to include both the off-contact method in which the screen plate and the substrate are in close contact. In addition, the term “screen plate” includes a mesh formed and used as a through hole for a stitch, or a material in which a through hole is directly drilled. Used to mean including

  Conventionally, when printing patterns and characters on various articles, screen printing has been performed, and in recent years, screen printing has also been performed in the field of electronics such as the formation of electronic circuits. The screen printing has the following problems when the viscosity of the printing agent is high.

  First, even if the printing agent is properly pressed with the squeegee device, the desired amount of printing agent cannot pass through the through-holes of the screen plate, and some printing agent remains in the through-holes, causing blurring in printing, etc. Have a problem to do.

  In the off-contact method, the screen plate must be separated from the printing material immediately after the screen plate and the printing material are brought into close contact with each other by the squeegee device, so-called plate separation. However, the screen plate and the printing material adhere to each other due to the viscosity of the printing agent. Therefore, there is also a problem that proper separation cannot be performed.

  Therefore, a squeegee device for screen printing shown in Patent Document 1 below has been developed. The squeegee device has a configuration in which an air discharge port is opened at a contact portion of the squeegee main body with the screen plate, and the printing remaining in the through hole by the air discharged vertically downward from the air discharge port. The agent can be forcibly dropped onto the surface of the substrate.

Japanese Patent Application No. 11-320822

  According to the squeegee device of the above-mentioned Patent Document 1, in the contact portion with the screen plate of the squeegee main body, the printing agent is pressed into the through hole of the screen plate at the contact portion and further filled in the through hole by the exhaust air. Since the agent can be forcibly dropped, the printing agent having a high viscosity can be reliably transferred to the substrate. In addition, plate separation is good.

  However, since the squeegee device of Patent Document 1 has an air discharge opening at the contact portion of the squeegee body, the area of the contact portion inevitably increases and the frictional resistance with the screen plate increases. Has a problem. When the frictional resistance is increased in this way, it affects the traveling speed of the squeegee body, and consequently the printing operation time.

  In addition, a pipe and a groove for supplying air to the air discharge port must be provided inside the squeegee body, which has a problem that the structure of the squeegee body is complicated.

  The present invention provides a squeegee device for screen printing and screen printing that achieves both a sound transfer of a high-viscosity printing agent and good separation of the screen plate while having a simple structure that does not require a complicated mechanism inside the squeegee body. Provide a machine.

In short, the squeegee device for screen printing according to the present invention has a squeegee body having a contact portion with a screen plate at the lower end portion, and an injection port behind the squeegee body and above the contact portion of the squeegee body. Gas injection means is provided, and when the squeegee main body is advanced, the injection port of the gas injection means is directed toward the contact portion of the squeegee main body and in a direction inclined downward toward the advancing direction of the squeegee main body. by the Ruco to inject, without giving any special structure squeegee body, to achieve a sound transfer printing agent having a high viscosity, and further to achieve good plate separation of the screen plate.

  Preferably, the squeegee main body has a gas guide surface for guiding the gas to the contact portion, and the injected gas can be reliably guided to the contact portion.

  Further, the gas injection means is configured to be able to adjust the injection angle, and the gas injection angle is set according to the traveling speed of the squeegee device, the characteristics of the printing agent and the screen plate, or the setting of the clearance between the screen plate and the substrate. Can be adjusted.

  The screen printing machine according to the present invention includes the above-described screen printing squeegee device according to the present invention.

  According to the squeegee device for screen printing according to the present invention, a complicated mechanism is not required inside the squeegee main body, and it is only necessary to separately provide the gas injection means behind the squeegee main body and above the contact portion. The existing squeegee body can be used effectively.

  Further, the gas injected by the gas injection means can effectively transfer the printing agent in the through hole of the screen plate, and even if the printing agent has a high viscosity, the transfer of the printing agent can be performed smoothly. Good separation can be realized.

  The screen printing machine according to the present invention also enjoys the same effects as the screen printing squeegee device that realizes the above-described sound transfer and good plate separation.

It is explanatory drawing which shows the relationship between the screen printing squeegee apparatus which concerns on this invention, a screen plate, and to-be-printed material. It is the principal part expanded sectional view which expanded the part enclosed with the dashed-dotted line of FIG. It is explanatory drawing which shows the relationship between the other example of the screen printing squeegee apparatus which concerns on this invention, a screen plate, and to-be-printed material. FIG. 4 is an enlarged cross-sectional view of a main part in which a portion surrounded by a dashed line in FIG. It is a perspective view of the printing table in the screen printer concerning the present invention.

  Hereinafter, the best embodiment of the present invention will be described with reference to FIGS.

  A screen printing squeegee device (hereinafter simply referred to as “squeegee device”) 1 according to the present invention is held by a squeegee holder 1a at a desired squeegee angle (attack angle) θ1, as shown in FIGS. The squeegee main body 2 and the gas injection means 3 provided behind the squeegee main body 2, that is, on the rear side in the traveling direction of the squeegee at the time of printing are provided.

  The squeegee body 2 has a contact portion 2b in contact with the screen plate 4 in the lower end portion 2a in the longitudinal direction, and a gas guide surface between the contact portion 2b and an injection port 3a of a gas injection means 3 described later. The gas G reaches the contact part 2b at an appropriate injection angle θ2. 1 and 2 show an example in which a flat plate is used as the squeegee main body 2. In the case of such a squeegee main body 2, the lower end surface is used as the gas guide surface 2c. 3 and 4 show an example in which the gas guide surface 2c is positively formed on the squeegee body 2, which is particularly effective when the squeegee angle θ1 is large.

  The gas injection means 3 includes an injection port 3a that injects the gas G toward the contact portion 2b of the squeegee body 2 at an injection angle θ2, and a supply path 3b that supplies the gas G to the injection port 3a. The injection port 3a naturally opens continuously along the longitudinal direction of the squeegee body 2, and the supply path 3b has a uniform gas flow rate and gas pressure over the entire region of the injection port 3a continuously opening. To supply. In addition, the injection port 3a and the supply path 3b can be easily formed by processing a known duct member. Although not specifically shown, the supply path 3b is connected to a compressor or blower built in or external to the printing press, and supplies a gas whose gas flow rate and gas pressure are appropriately adjusted to the injection port 3a.

  Further, as shown by the two-dot chain line in FIGS. 3 and 4, the injection port 3a and the supply path 3b are made of duct members that are processed differently from the duct member that forms the injection port 3a and the supply path 3b shown by the solid lines. Thus, the gas injection angle θ2 can be adjusted. Or the duct member which can adjust the angle of the part which forms the injection port 3a, and the part which forms the supply path 3b can be used.

  Note that air (atmosphere) can be used as the gas G. Alternatively, nitrogen gas can be used. Nitrogen gas is suitable for printing agents that dislike oxidation, such as solder cream. When used, nitrogen gas is supplied from the generator or cylinder to the injection port 3a via the compressor or the like.

  The screen printing machine according to the present invention includes the squeegee device 1 according to the present invention having the above-described configuration. Specifically, as shown in FIG. 5, similarly to a known printing machine, a screen plate 4 fixed on a printing table 8 by a screen frame 7 with a predetermined clearance from the substrate 5, and the screen plate 4 The squeegee device 1 according to the present invention is supported together with the scraper 6 so as to be movable back and forth. Although FIG. 5 shows an example of an off-contact type printing machine, a contact-type printing machine may be arbitrarily selected depending on the implementation.

  Finally, a screen printing method using the squeegee device 1 according to the present invention described above will be described. First, like the conventional screen printing method, the scraper 6 is moved backward to fill the through hole 4a of the screen plate 4 with the printing agent, and then the squeegee device 1 is moved forward as shown in FIGS. Proceed to start screen printing.

  At this time, the squeegee device 1 injects the gas G toward the contact portion 2 by the gas injection means 3 while bringing the contact portion 2 b of the squeegee body 2 into contact with the screen plate 4.

  In the present invention, as shown in the figure, the squeegee device 1 (squeegee main body 2) advances from the injection port 3a of the gas injection means 3 provided behind the squeegee main body 2 and above the contact portion 2b of the squeegee main body 2. Since it can be injected in a direction inclined downward (injection angle θ2) toward the direction, the component of the gas pressure of the injected gas presses the printing agent in the through hole 4a of the screen plate 4.

  Therefore, even if the printing agent has a high viscosity, the printing agent can be transferred to the surface of the printing material 5 in a sound manner. Therefore, it is possible to transfer the printing agent effectively to the steps and recesses on the surface of the substrate 5.

  Moreover, since the screen plate 4 can be separated well with the sound transfer described above, the clearance can be made as narrow as possible, and high-density printing is possible. Furthermore, it is possible to increase the speed of the squeegee.

  As described above, the squeegee device 1 according to the present invention has a simple structure, and can achieve sound transfer and good plate separation even when the printing agent has a high viscosity.

  Moreover, the simple structure does not require a complicated mechanism inside the squeegee main body 2, and is located behind the squeegee main body 2 and above the contact portion 2 b, and separately from the squeegee main body 2. Since only the 3a is required, the existing squeegee body 2 can be used effectively.

  Furthermore, the gas injection angle θ2 can be adjusted according to the progress speed of the squeegee device, the characteristics of the printing agent and the screen plate, or the setting of the clearance between the screen plate and the substrate, and the gas flow rate and pressure are also adjusted. can do.

  The screen printing machine according to the present invention also enjoys the same effects as the squeegee device 1 according to the present invention that realizes the above-described sound transfer and good plate separation.

DESCRIPTION OF SYMBOLS 1 ... Squeegee apparatus, 1a ... Squeegee holder, 2 ... Squeegee main body, 2a ... Lower end part, 2b ... Contact part, 2c ... Gas guide surface, 3 ... Gas ejection means, 3a ... Injection port, 3b ... Supply path, 4 ... Screen Plate, 4a ... through hole, 5 ... substrate, 6 ... scraper, 7 ... screen frame, 8 ... printing table, G ... gas, θ1 ... squeegee angle, θ2 ... jetting angle.

Claims (4)

When the squeegee main body having a contact portion with the screen plate at the lower end and a gas injection means having an injection port behind the squeegee main body and above the contact portion of the squeegee main body, when the squeegee main body is advanced, injection port of the gas injection means towards the contact portion of the squeegee body, and a screen printing squeegee device comprising a Turkey to inject gas in the direction of downward inclination toward the traveling direction of the squeegee body .   2. The screen printing squeegee device according to claim 1, wherein the squeegee body has a gas guide surface for guiding the gas to the contact portion.   2. The screen printing squeegee device according to claim 1, wherein the gas injection means is capable of adjusting an injection angle.   A screen printing machine comprising the screen printing squeegee device according to any one of claims 1 to 3.

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