JPH02150352A - Squeegee for screen printing - Google Patents

Abstract

PURPOSE:To obtain a squeegee for screen printing free from the occurrence of an omission or an abrasion loss such as a flaw on a printing surface and superior in durability by a method wherein a squeegee body is longer in width than a medium to be printed, the printing surface has the same width as the medium to be printed, and a cutout is provided on each side of the printing surface. CONSTITUTION:A screen plate 8 is loaded on a material to be printed 6, such as a printed wiring board, loaded on a printing mount 7. A squeegee is moved in a direction of an arrow while applying a constant pressure on a mesh cloth 80 in the screen plate 8 and spreading a printing ink 5. At this time, the squeegee has a printing surface 10 with the same width as a width W of the material to be printed 6, furthermore having a cutout part 101 and a flange part 11 on each side thereof. In this manner, the both ends of the printing surface 10 never strongly abut on end faces G of the medium to be printed 6, therefore being free from the application of large frictional force and deformation stress. Therefore, the printing surface 10 of a squeegee body 1 is free from the occurrence of an omission or an abrasion loss such as a flaw.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to marking on name plates, printed wiring boards, I
Used when forming electric circuits such as C boards. Regarding a highly durable screen printing squeegee.

[Prior art]

BACKGROUND ART Conventionally, a screen printing squeegee (hereinafter also simply referred to as a squeegee) is known that is composed of a squeegee body 9 and a squeegee holder 91 attached to the squeegee body 9, as shown in FIG.

As shown in FIGS. 21 to 23, the squeegee main body 9 is generally made of an elastic material with excellent abrasion resistance, such as silicone rubber, and has a width wider than the width W of the printing medium 6. The width is, for example, about 200 mm.

On the other hand, the squeegee holder 91 is made of a stainless steel plate, a wooden plate, or the like. The squeegee main body 9 is attached to a squeegee holder 91 by engagement means 92 such as screws.

By the way, the squeegee is as shown in FIG.

The printing ink 5 is spread on a part of the screen plate 8 onto the surface of the printing material 6 such as an IC board.

This is a tool for transferring a pattern 61 such as a predetermined electric circuit.

Further, the screen plate 8 is made of silk (IRF).

The surface of a mesh cloth 80 made of synthetic fiber or the like is uniformly coated with a photosensitive emulsion 81, and a pattern 61 consisting of the above-mentioned predetermined electric circuit or the like is photographically printed on a portion thereof.

Therefore, when the strip 4 is placed in a substantially forward tilted state and pulled in the Y direction toward the operator, the printing ink 5 is transferred as a predetermined pattern 61 onto the surface of the printing material 6 placed on the printing table 7. Therefore, in the pattern 61, as shown in FIG. 24, the transfer ink 55 at the center of the printing material 6 and the transfer ink 56 at the edge have approximately the same film thickness. That is, the membrane is about 8-10 μm both in the center and at the edges.

(Problem to be solved) However. The conventional squeegee described above has the first problem. That is, as shown in FIGS. 21 to 23, the printing surface 90, which is the tip surface of the squeegee body 9, is easily abraded by 1 ft at the corners 61 to 64 and the end G of the printing medium 6, and the printing surface 90 is easily abraded by 1 ft. Part of the surface 90 is likely to be chipped and scratched. That is, at the corners 61 to 64 and the end G of the printing material 6, a step corresponding to the thickness of the printing material 6 exists between the printing surface 90 and the printing table 7. Therefore, a large pressing load acts particularly on this portion of the printing surface 90.

It is thought that frictional force and deformation stress increase, causing the above-mentioned wear and tear.

Furthermore, in connection with the above-mentioned frictional force and deformation stress, damage to the mesh cloth 80 in the screen plate 8 and film peeling of the photosensitive emulsion 81 tend to occur frequently.

In order to solve the above-mentioned problems, an attempt was made to make the width of the squeegee the same as the width of the printing material 6, as will be explained in detail in a comparative example with the first embodiment described later. However, as a result, the film thickness of the transfer printing ink became non-uniform.

The present invention has been made in view of these conventional problems, and an object thereof is to provide a screen printing squeegee that does not cause wear and tear such as chips or scratches on the printed surface and has excellent durability.

[Means for solving problems]

The present invention consists of a first invention and a second invention.

The first invention is a squeegee for screen printing comprising a squeegee body and a squeegee holder attached to the squeegee body, the squeegee body having a width H that is longer than the width of the printing material.

A squeegee for screen printing is characterized in that it has a printing surface having the same width as the width of the printing material, and has cut portions on both sides of the printing surface.

In the present invention, 2 the squeegee body stretches the printing ink on a screen plate and transfers it to the printing material,
It is made of urethane rubber, silicone rubber, chlorinated or brominated butyl rubber, FRP material made of glass fiber-reinforced epoxy resin, etc. Also, the shape of the printing surface at the tip of the squeegee main body is as follows.

There are various shapes such as a smooth shape, a tapered shape, a pencil tip shape, and a round shape (see Fig. 14).

The squeegee holder is used to attach the squeegee main body and to be used by an operator to hold the squeegee during screen printing work.

For example, stainless steel plate or wooden plate with a thickness of about 4 mm.

The back plate may be made of a piece of plastic or the like.

In addition, the width of the printed material in -h refers to a printed wiring board.

This refers to the width in the direction perpendicular to the direction in which the squeegee moves relative to the substrate to be printed, such as an IC board.

Further, the printing surface is the tip of the squeegee main body that stretches the printing ink while contacting the mensch cloth of the screen plate.

The two most notable things about this invention are:

The squeegee body has a printing surface with the same width as the printing substrate,
In addition, the printing surface has cut portions on both sides thereof. Here, the notch is one in which, for example, a notch having a curved surface (R) is formed (Fig. 1,
(See Figures 3 and 7).

On the other hand, a second invention is a squeegee for screen printing comprising a squeegee main body and a squeegee holder attached to the squeegee main body, the squeegee main body having a printing surface with the same width as the width of the printing material, The squeegee for screen printing is characterized in that the printing surface has edges on both sides, and the printing surface protrudes beyond the edges.

In the second invention, the squeegee main body, squeegee holder, width, and printing surface are the same as those shown in the first invention.

Furthermore, the edge portion has the function of scraping out the printing ink on the screen plate on both sides of the printing surface to the left and right sides of the squeegee, and absorbing and removing the deformation stress acting on both ends of the squeegee due to the tension of the screen plate. There are two types of edges: one that forms part of the squeegee body, and the other that is provided at the end of the squeegee holder.

In addition, the above-mentioned protrusion means that the above-mentioned printed surface is lower than the edge,
That is, it refers to a state in which the printed surface protrudes toward the side of the screen plate that comes into contact with the mesh cloth.

Furthermore, the ski υ of the present invention can be used not only for printing for forming electric circuits but also for various screen printing such as marking on nameplates.

[Operations and Effects] This squeegee has a printing surface with the same width as the width of the printing substrate. Therefore, a large pressing load is not applied to the squeegee body at both ends of the corner 1 of the printing material.
Furthermore, the frictional force and deformation stress with the contact surface of the screen plate will not increase.

Further, each of the printing surfaces has notches on both sides. Therefore, printing ink for durability can be scraped out to both left and right sides of the squeegee by the cut portion, and deformation stress acting on both ends of the squeegee due to the tension of the screen plate can be absorbed and removed. Therefore, the printed surface is chipped.

No wear and tear such as scratches will occur.

This squeegee has a width that is longer than the width of the printing substrate. Therefore, on the surface of the printing material.

The transfer ink at the center and the transfer ink at the edges can print a pattern with a film thickness between the lines (see FIG. 4). Therefore, the thickness of the printing film on the printing material is uniform, and therefore, according to the present invention, it is possible to provide a squeegee with excellent durability without wear and tear such as chips and scratches on the printing surface. Also,
The photosensitive emulsion on the mesh cloth in the screen plate does not peel off.

〔Example〕

First Embodiment A squeegee according to this embodiment will be explained with reference to FIGS. 1 to 8.

That is, the squeegee in one example has a squeegee main body 1.

It consists of a squeegee holder 2 attached to the squeegee main body 1. And, the squeegee main body 1 is.

It has a width longer than the width W of the printing medium 6. Also.

It has a printing surface 10 having the same width as the width W of the printing medium 6. Further, the squeegee main body has notches 101 on both sides of the printing surface 10, respectively.

Furthermore, wing portions 11 are provided on both sides of the cut portion 101 .

That is, the squeegee main body 1 is made of urethane rubber.

It is made of an elastic material such as silicone rubber, and the printing surface 10 has a smooth surface. The eight squeegee main body 1 has cut portions 101 having curved surface portions R at both ends thereof. Further, the wing portion 11 has a width K, and has curved portions R on both end faces, similar to the squeegee main body 1.

Further, as shown in FIG. 2, the squeegee main body 1 is held between the squeegee holder 2 and its back plate 4, and is integrally engaged with the engagement means 3 such as screws. Also,
The squeegee holder 2 and the back plate 4 are each made of a stainless steel plate with a thickness of about 4 mm. The lower end 21 of the squeegee holder 2 and the lower end 4 of the back plate 4
What is 1?

The squeegee forms the same level surface approximately at the center.

Note that the back plate 4 is as shown in FIG.

It can be long. Further, the upper end portion 17 of the squeegee main body 1 is located approximately at the upper center of the squeegee holder 2.

The squeegee in this example is configured as described above, so 1
It has the following effects.

That is, when using screen printing, a screen plate 8 is placed on a printing material 6 such as a printed wiring board placed on a printing stand 7 as shown in FIG. Then, while applying a constant pressure onto the MEC 1 cloth 80 on the screen plate 8, the squeegee is moved in the direction of the arrow while stretching the printing ink 5. At this time, one squeegee has a printing surface 10 with the same width as the width W of the printing material 6, and also has notches 101 and wings 11 on both sides, so the printing surface]
Both ends of 0 do not come into strong contact with the end surface G of the printing material 6. Therefore, strong frictional force and deformation stress are not applied to both end faces. Further, the wing portions 11 scrape out ink to both the left and right sides. Further, the wing portions 11 relieve the pushing force and the like from the mesh cloth 80 acting on both ends of the squeegee main body 1.

Therefore, according to one example, the squeegee main body 1 is.

As described above, both ends of the squeegee are attached to the end surface G of the printed matter 6, so that the printed surface 10 will not be chipped or cause abrasion such as scratches.
Since the screen does not come into strong contact with the two, the screen plate interposed between the two will not be damaged.

However, in screen printing according to one example, the fourth
As shown in the figure, the film thickness of the transfer printing ink 51 at the center and the transfer printing ink 52 at both edges of the substrate 6 was approximately 7 to 9.5 μm. Moreover, the photosensitive emulsion on the mesh cloth 80 did not peel off.

As described above, according to one example, it is possible to print a pattern with a uniform film thickness on a printing material such as a printed wiring board, and it has wear resistance that prevents wear and tear such as chips and scratches on the printed surface. can provide an excellent squeegee. Moreover, the durability of the screen plate is also improved.

Next, a comparative example will be explained using FIGS. 5 and 6.

That is, in the squeegee according to the comparative example, as shown in FIG. 5, the squeegee body 9 has a printing surface 90 having the same width as the width W of the printing medium 6, similar to the squeegee according to the first example. One important thing here is that the two comparative squeegees do not have the notches 101 and wing parts 11 on both sides of the printing surface 90 as in the first embodiment. Next, screen printing was performed on a printing material 6 such as a printed wiring board using the squeegee.

As a result, as shown in FIG. 6, the thickness of the transfer printing ink 53 at the center of the printing material 6 is about 7 to 9 μm.
m, whereas the transfer printing ink 54 on both edges is 10
The thickness was ~13 μm. As is known from the above, although the squeegee main body 9 of both the squeegee of this example and the squeegee of the comparative example has the same width as the width of the printing substrate 6, the squeegee of this example is more capable of making the film thickness uniform. can. This is due to the presence or absence of the notch portion 101 and the wing portion 11.

In addition, in the two examples of squeegees, instead of the wing portions 11, as shown in FIG.
(wing part 12 having an oblique taper T)
It is also possible to do this.

Furthermore, instead of the wing section 11, a wing section 13 continuous with the squeegee main body 1 may be used as shown in FIG.

All of the wing parts 11, 12, and 13 described above essentially have the same function of scraping out the printing ink 5 at both left and right ends of the squeegee body I, and relieving the pushing force from the mesh cloth 80 that acts on both ends of the squeegee body I. .

Second Practical Example A squeegee according to this example will be explained using FIGS. 9 to 14.

That is, in the squeegee of this example, as shown in FIG. has. Further, the printing surface 10 has a leading end thereof protruding beyond the edge 14 by a length t. As shown in FIG. 1O, the lower end 41 of the back plate 4 protrudes beyond the lower end 21 of the squeegee holder 2. This is the printing surface I
O and the back side of the edge 14, the printed surface 10 and the edge 14
This is to equally support the Other configurations are as described in the first section above.
It was the same as the squeegee according to the example.

Furthermore, the squeegee in this example can also be in a state in which the edge 15 and the printing surface 1o are connected, as shown in FIGS. 11 and 12. A step 103 having one curved surface portion R is provided between the edge portion 15 and the printing surface 10. Further, the other configurations are the same as the squeegee of the first embodiment.

Furthermore, the two examples of squeegees are as shown in Fig. 13 (,
The edge 16 and the printing surface 10 are connected.

The edge portion 16 may be tapered at an upward slope angle θ at both left and right ends.

Note that the protruding printing surface 10 is shown in FIGS. 14(A) to (
As shown in F), the tip surface is smooth (A), and the tapered type (
B), pencil tip shape (C).

It can be made into various shapes such as round shape (F).

These shapes can also be used in the first embodiment and the third and fourth embodiments described later.

Third Embodiment A squeegee according to this embodiment will be explained with reference to FIGS. 15 to 18.

That is, in the two examples of squeegees, the printing surface 10 of the squeegee main body 1 is on both sides.

It has an edge H that is recessed by a length t. The edge It is.

It is constituted by both ends of the squeegee holder 2.

In addition, the lower end portion 21 of the squeegee holder 2 and the back plate 4
The lower end portion 41 of the squeegee is on the same level at approximately the center of the squeegee. The rest is the same as the squeegee according to the first embodiment.

The printed surface 10 also has an edge H formed by the lower end 41 of the back plate 4, as shown in FIGS. 17 and 18.
It is also possible to make it protrude by a length L.

Fourth Embodiment A squeegee according to this embodiment will be explained with reference to FIGS. 19 and 20.

That is, in the squeegee of this example, instead of the straight back plate 4 in the third embodiment, a temporary back plate 4 is provided with an arch-shaped cutout 104 in the center. The other configurations were the same as those of the third embodiment.

According to the second to fourth embodiments, it is possible to provide a highly durable squeegee that does not suffer from wear and tear such as chips or scratches on the printed surface, similar to the first embodiment. can. Moreover, a pattern with a uniform film thickness can be printed on a printing material such as a printed wiring body. Furthermore, the photosensitive emulsion of the mesh cloth in the screen plate does not peel off.

[Brief explanation of the drawing]

1 to 8 show a first example and a comparative example. Fig. 1 is a front view of the squeegee, Fig. 2 is an enlarged side view of the squeegee shown in Fig. 1, Fig. 3 is a sectional view of the squeegee in use, and Fig. 4 shows the relationship between the film thickness of printing ink and the position of transfer printing ink. A graph showing the relationship, Figure 5 is a cross-sectional view of the squeegee in use as a comparative example,
FIG. 6 is a graph showing the relationship between the film thickness of printing ink and the position of transfer printing ink in a comparative example, FIGS. 7 and 8 are front views of other embodiments of the squeegee, and FIGS. 9 to 14 are Second
9 is a front view of the squeegee, FIG. 10 is an enlarged side view of the squeegee in FIG. 9, FIGS. 11 and 13 are front views of other embodiments of the squeegee, and FIG. 12 is a front view of the squeegee. 11, FIG. 14 is an enlarged side view of another embodiment of the squeegee, and FIG.
15 to 18 show the third embodiment, FIG. 15 is a front view of the squeegee, FIG. 16 is an enlarged side view of the squeegee in FIG. 15, and FIG. 17 is a front view of the squeegee in another embodiment. Fig. 18 is an enlarged side view of the squeegee shown in Fig. 17, Fig. 19 is a front view of another embodiment of the squeegee, Fig. 20 is an enlarged side view of the squeegee shown in Fig. 19, and Figs. 21 to 24 are conventional examples. and the second
Figure 1 is a plan view of the screen printing device, Figure 22 is the 21st
FIG. 23 is a diagram illustrating the use of a conventional squeegee, and FIG. 24 is a graph showing the relationship between the film thickness of printing ink and the position of transfer printing ink in the conventional example. 1 ・ ・ ・ lO・ ・ ・ 2 ・ ・ 3 ・ ・ ・ 4 ・ ・ ・ 5 ・ ・ 51 to 56 Squeegee body printing surface. Squeegee holder engagement means. Back plate. printing ink. ...Transfer printing ink 1 Figure 5 Figure 3 Figure 4 Figure 5 Figure 3 Figure 4 Turtle copying device Figure 9 Figure 11 (Force 1 Sword) Figure 13 Figure 14 Figure 19 Figure 15 Figure 17g Figure 21 Figure of animals

Claims (2)

[Claims] (1) A squeegee for screen printing consisting of a squeegee body and a squeegee holder attached to the squeegee body, the squeegee body having a width longer than the width of the substrate to be printed, and the width of the squeegee body being longer than the width of the substrate to be printed. A screen printing squeegee characterized by having a printing surface of the same width and having notches on both sides of the printing surface. (2) A squeegee for screen printing consisting of a squeegee body and a squeegee holder attached to the squeegee body, wherein the squeegee body has a printing surface with the same width as the printing substrate, and A squeegee for screen printing, characterized in that it has edges on both sides, and the printing surface protrudes beyond the edges.