JPH067935U - Paste printing equipment for large substrates - Google Patents

Abstract

(57) [Abstract] [Purpose] The paste is uniformly and surely printed on the entire area of the base material by eliminating the variations in the printing pressure in each part of the roller of the roller squeegee. [Structure] This paste printing apparatus 10 includes a large-sized base material 1
A surface plate 5 for fixing the squeegee, and two squeegees S1 and S2 arranged in close contact with the base material 1 are provided. The squeegees S1 and S2 are arranged in a line in a direction substantially perpendicular to the moving direction. The squeegees S1 and S2 move relative to the base material 1 and in parallel with each other. The length of the rod R included in the squeegee S1 and S2 is 50 mm to 13
It is 0 mm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paste printing device for a large substrate.

[0002]

[Prior art]

 Conventionally, an example of using the paste printing apparatus 40 as shown in FIG. 7 is, for example, a case where a conductive metal paste P is printed on a ceramic green sheet 41 to form a substrate having a conductor circuit. To be

When printing the paste P, the green sheet 41 is fixed to the printing device 40 together with the printing mask M, and the pressing portion 43 of the squeegee 42 is closely arranged on the green sheet 41. The fixed shaft 44 protruding from both ends of the squeegee 42 is supported by a fixed frame 45. The printing pressure of the squeegee 42 is set by adjusting the downward pressing force of the fixing frame 45.

Then, the paste P is supplied to the front side in the moving direction of the squeegee 42 and the squeegee 42 is moved, so that the paste P is printed on a predetermined portion of the green sheet 41. There are two types of conductor circuits formed in this way: a through-hole conductor circuit 46 and a wiring circuit pattern (not shown).

In recent years, there has been a demand for an increase in the size of this type of substrate. Therefore, the paste P can be applied to a base material having a size more than twice that of the conventional green sheet 41 (about 200 mm square to 350 mm square). Printing is considered. Therefore, in this case, it is necessary to use a squeegee 42 having a wide width of about 250 mm to 400 mm.

[0006]

[Problems to be solved by the device]

 However, when the width of the squeegee 42 is increased as described above, the pressing portion 43 is distorted by the pressing force when the fixing frame 45 is pressed downward, and the printing pressure near the center of the pressing portion 43 is applied to both ends. It becomes smaller than that. Further, even if a material having high rigidity is used for the pressing portion 43, it is difficult to sufficiently avoid such distortion.

In the formation of the through-hole conductor circuit 46, the green sheet 41 is partially defective in filling, and the conductor circuit in that portion is likely to have increased resistance and disconnection. On the other hand, if the printing pressure is set with reference to the center of the pressing portion 43, the printing pressure at both ends of the pressing portion 43 becomes too high, which is also not preferable.

Further, even when a wiring circuit pattern is formed, partial blurring or blurring of lines is likely to occur for the same reason. Therefore, the width and thickness of the pattern become non-uniform, and there are many problems such as variations in the resistance value and shorts and breaks in the conductor circuit.

The present invention has been made in view of the above circumstances, and an object thereof is to divide a squeegee into a plurality of squeegees and eliminate variations in printing pressure at various portions of the pressing portion, thereby making It is an object of the present invention to provide a paste printing apparatus for large-sized substrates, which can perform paste printing uniformly and surely in all areas.

[0010]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention comprises a surface plate for fixing a large-sized base material and a plurality of squeegees arranged in close contact with the base material. It is characterized by moving relative to each other and parallel to each other.

[0011]

[Action]

 According to this configuration, since it is not necessary to increase the width of each squeegee and the length of the pressing portion, no distortion occurs in any pressing portion even when the printing pressure is applied. Therefore, the printing pressures at the center of the pressing portion and at both ends of the pressing portion have substantially the same value.

When the squeegees each having such a pressing portion are set to a predetermined printing pressure and printing is performed, the paste can be uniformly and reliably printed on the entire area of the base material. .

In this case, it is desirable that the squeegees be arranged in a line on a straight line different from the relative movement direction. This is because such an arrangement provides the same effect as a single continuous squeegee.

Further, it is desirable that the squeegees are arranged in a staircase shape. With such an arrangement, the printing pressure is applied on the diagonal line of the mask, so that the adhesion between the mask and the base material located under the mask is improved.

Further, it is desirable that the pressing portion of each squeegee has a length of 50 mm to 130 mm. If this length is shorter than 50 mm, the number of squeegees will inevitably increase, and it will be troublesome to make the printing pressures uniform. On the other hand, if the length is longer than 130 mm, the pressing portion of the squeegee is likely to be distorted, resulting in a difference in printing pressure between the both ends and the center.

Further, as the material of the pressing portion, a relatively hard synthetic resin such as urethane or Teflon is desirable.

[0017]

【Example】

 Embodiments 1 and 2 in which the present invention is embodied in a device for printing a conductive metal paste on a large ceramic green sheet will be described in detail with reference to the drawings.

In Example 1, a ceramic green sheet 1 having a thickness of 0.5 mm and a size of 250 mm was used as a base material. Then, the through holes 2 having an inner diameter of 0.2 mm were formed through the green sheet 1 by punching. Further, in order to form the conductor circuit 3 in the through hole as the conductor circuit and the wiring circuit pattern, the tungsten paste P was prepared by a conventional method.

Next, the configuration of the paste printing apparatus 10 according to the first embodiment will be described. As shown in FIGS. 1 and 2, the printing apparatus 10 according to the first embodiment fixes the green sheet 1 substantially horizontally, and a platen 5 for closely disposing the mask M on the green sheet 1. Is equipped with. Above the surface plate 5, a pair of guide rods 4 are horizontally installed in parallel and supported. A movable block 6 is slidably provided on both guide rods 4. The movable block 6 is driven in the longitudinal direction of the guide rod 4 (in the double-headed arrow A direction) by a driving unit (not shown).

On the lower surface of the movable block 6, three fluid pressure cylinders 11, 12, 13 which are vertically expandable and contractible are arranged. Among them, the two cylinders 12 and 13 are arranged vertically in parallel with the direction of the double-headed arrow A.

As shown in FIGS. 1 and 2, a scraper 11 a for stretching the paste P is fixed to the lower end of the cylinder 11. Further, as shown in FIG. 2, fixed frames 8 for supporting the squeegees S1 and S2 are fixed to the lower ends of the cylinders 12 and 13, respectively. A cutout portion 8a is formed in the lower portion of the fixed frame 8. The squeegees S1 and S2 are arranged in the cutout portion 8a, and the fixed frame 8 supports fixed shafts 9 projecting from both side surfaces of the squeegees S1 and S2. A urethane rod R as a pressing portion is attached to the lower edge of each squeegee S1 and S2. The length of the rod R is 120 mm.

As shown in FIG. 3, the two squeegees S1 and S2 are slightly separated from each other on the same axis and have a positional relationship substantially perpendicular to the moving direction indicated by the double-headed arrow A. The rods R of both squeegees S1 and S2 move on the transparent region of the through-hole forming hole 2 in the green sheet 1. On the other hand, the gap between the squeegees S1 and S2 moves on a region of the green sheet 1 where the through hole forming hole 2 is not formed.

Next, a method of printing the paste P using the printing device 10 will be described. First, the masks M are arranged on the green sheet 1, and they are fixed on the surface plate 5. Next, the rod bodies R of both squeegees S1 and S2 are placed in close contact with one end of the mask M (right end in FIG. 1). Here, the amount of pressure fluid supplied to each cylinder 12, 13 is adjusted in advance, and the printing pressure of each squeegee S1, S2 is set to 3.5 kg / cm ² .

Then, while the paste P is supplied to the front side in the moving direction of the squeegees S1 and S2 and the scraper 11a, they are moved to the other end of the mask M (the right end in FIG. 1). At this time, the paste P is uniformly stretched by the scraper 11a, and then the paste P is filled in the through hole forming hole 2 by both squeegees S1 and S2.

In the first embodiment, the paste P is filled in the through-hole forming hole 2 by repeating this series of operations as necessary, and the through-hole conductor circuit 3 is filled in the portion. Formed.

In the subsequent wiring circuit pattern forming step, first, the mask M and the squeegees S1 and S2 were replaced with those for forming a wiring circuit pattern. The material of the squeegee rod used here is urethane.

The shape is exactly the same as that of the rod R except that it is made of [90]. Then, after setting the printing pressure of the squeegees S1 and S2 to be lower (2.5 kg / cm ² ), a linear wiring circuit pattern was printed on the surface of the green sheet 1 according to the above method.

Next, when the formed through-hole conductor circuits 3 are observed, all the through-hole forming holes 2 are reliably filled with the paste P, and any portion of the green sheet 1 is filled. No defective filling was observed. Further, when the wiring circuit pattern was observed, lines having a uniform width and thickness were formed on the entire surface of the green sheet 1, and no bleeding or blurring was observed on the lines.

In addition, the substrate obtained by sintering the green sheet 1 according to a conventional method was extremely excellent in reliability without fluctuation in resistance value, short-circuit and disconnection of the conductor circuit 3. Subsequently, the printing apparatus 20 according to the second embodiment will be described with reference to FIGS. 4 and 5. The printing apparatus 20 basically has a surface plate 5, a movable block 6, three fluid pressure cylinders 11 to 13, two squeegees S1 and S2, and a scraper, similarly to the configuration of the first embodiment. 11a. The function of each of these members is almost the same as that of the printing apparatus 10 described above.

However, in the printing apparatus 20, the arrangement positions of the fluid pressure cylinders 11, 12, 13 are different from those in the first embodiment. That is, the cylinder 13 having the squeegee S2 is arranged between the cylinder 12 having the squeegee S1 and the cylinder 13 having the scraper 11a (see FIGS. 4 and 5).

The width of each squeegee S1 and S2 and the length of the rod are 130 mm. Therefore, the squeegees S1 and S2 are arranged in a stepwise manner with respect to the relative movement direction thereof, and the ends thereof are overlapped with each other. Therefore, as shown in FIG. 5, even when the squeegees S1 and S2 are moved, a blank portion does not occur between the moving regions of the two rod bodies R.

Next, the same green sheet 1 and paste P as in Example 1 were used, and the conductor circuit 3 in the through hole and the wiring circuit pattern were formed by the same method. As a result of observing these, it was confirmed to be suitable as in Example 1. However, the substrate obtained by sintering the green sheet 1 according to a conventional method had extremely high reliability without variations in resistance value, short-circuiting and disconnection of the conductor circuit 3.

Further, as Comparative Examples 1 to 3 with respect to Examples 1 and 2, a squeegee having a pressing portion with a width of 300 mm was used, and the results of paste printing by the above method are described below.

In Comparative Example 1 in which the printing pressure was set to 3.5 kg / cm ² and the conductor circuit in the through hole was formed, a defective filling portion was found in the central portion of the green sheet. On the other hand, in Comparative Example 2 in which the printed circuit pattern was formed with the printing pressure set to 2.5 kg / cm ² , bleeding and thickening occurred in the line at the outer peripheral portion of the green sheet. Further, in Comparative Example 3 in which the printing pressure was set to 1.0 kg / cm ² and the wiring circuit pattern was formed, the lines were partially blurred at the center of the green sheet.

Now, according to the configurations of the printing apparatuses 10 and 20 of the above-described first and second embodiments, the individual rod bodies R are not so long, unlike the case of each comparative example. Therefore, even when the printing pressure is applied to the squeegees S1 and S2, no distortion occurs in any of the rod bodies R. Therefore, the printing pressures at the central portion C of the rod R and both end portions T of the rod R have substantially the same value.

Moreover, according to these configurations, since the respective squeegees S1 and S2 can be set to predetermined printing pressures, the paste P is printed uniformly and surely over the entire area of the green sheet 1. It becomes possible to do. Further, since the number of squeegees in the printing device 10, 20 is as small as two, it is not so troublesome to make each printing pressure uniform.

Further, according to these configurations, it is possible to use only one of the squeegees S1 and retract the other. Therefore, there is an advantage that the paste P printing can be applied not only to the large green sheet 1 but also to the normal size.

In particular, the structure of the second embodiment is advantageous in that the adhesion between the mask M and the green sheet 1 is improved. The present invention is not limited to the first and second embodiments described above, but can be modified into the following configurations. For example, (a) the lengths and materials of the squeegees S1 and S2 do not necessarily have to be the same.

(B) As in another example of the printing apparatus 30 shown in FIG. 6, the fixed shafts 31 of both squeegees S1 and S2 may be partially shared. (C) The number of squeegees S1 and S2 is not limited to two as in the first and second embodiments and other examples.

(D) Instead of the squeegees 1 and 2 using the squeegees S1 and S2 having the rectangular rod R and the other examples, it is of course possible to use a roller squeegee having a roller as a pressing portion. is there.

[0040]

[Effect of device]

 As described in detail above, according to the paste printing apparatus for a large-sized substrate of the present invention, since the squeegee is divided into a plurality of pieces, variations in printing pressure at various places of the pressing portion are eliminated. This has an excellent effect that the paste printing can be performed uniformly and surely over the entire area of the material.

[Brief description of drawings]

FIG. 1 is a partial front view showing a paste printing apparatus 10 according to a first embodiment.

FIG. 2 is a partial left side view of the paste printing apparatus 10 shown in FIG.

3 is a squeegee S1 of the paste printing apparatus 10 of FIG.
, S2 is a schematic view showing the positional relationship.

FIG. 4 is a partial left side view showing a paste printing apparatus 20 according to a second embodiment.

5] Each squeegee S1 of the paste printing apparatus 20 of FIG.
, S2 is a schematic view showing the positional relationship.

FIG. 6 is a squeegee S1 of a paste printing apparatus 30 of another example.
, S2 is a schematic view showing the positional relationship.

FIG. 7 is a partial front view showing a conventional type paste printing apparatus 40.

[Explanation of symbols]

1 Green sheets as base materials, 5 surface plates, S1, S
2 Squeegee, R A rod as a pressing part.

Claims (4)

[Scope of utility model registration request] 1. A surface plate (5) for fixing a large-sized base material (1), and a plurality of squeegees (S1, S2) arranged in close contact with the base material (1). A paste printing apparatus for a large substrate, wherein each squeegee (S1, S2) moves relative to the substrate (1) and in parallel with each other. 2. The paste printing apparatus for a large-sized substrate according to claim 1, wherein the squeegees (S1, S2) are arranged in a line on a straight line different from the relative movement direction thereof. . 3. The paste printing apparatus for a large-sized substrate according to claim 1, wherein the squeegees (S1, S2) are arranged in a stepwise manner. 4. The paste printing apparatus for a large-sized substrate according to claim 2, wherein the length of the pressing portion (R) provided in each of the squeegees (S1, S2) is 50 mm to 130 mm. .