JP2003124607A - Forming method for conductor pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method for a conductive pattern which can deter and prevent an insulating film and filter paper from shifting in position during conveyance after printing and prevent the insulating film, etc., from having an outward shape defect, a leak defect, etc. SOLUTION: On a surface of the continuous flexible insulating film 1, a plurality of 1st conductive patterns are printed with conductive paste 9 and dried and a through hole is bored in the respective 1st conductive patterns; and the insulating film 1 is turned over and the flexible filter paper 15 is put over its surface and brought into electrostatic contact by an electrostatic charging device 3. A plurality of 2nd conductive patterns are printed on the reverse surface of the insulating film 1 with conductive paste 17, the 1st and 2nd conductive patterns are brought into electric contact with each other, and the insulating film 1 and filter paper 15 are separated to dry the 2nd conductive patterns.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a conductive pattern used in the fields of electricity, electronics, semiconductors and the like.

[0002]

2. Description of the Related Art Conventionally, a continuous flexible insulating film 1
In the case of forming a conductive pattern on the surface of the insulating film 1, first, a plurality of first conductive patterns 8 are formed on the surface, which is the upper surface of the insulating film 1, by a fluid conductive paste 9 to form a screen. After printing, each first conductive pattern 8 is dried by a dryer 12 (see FIGS. 3 (a) and 3 (b)),
Through holes 14 are punched from above in each dried first conductive pattern 8 (see FIGS. 4A and 4B).

After the through holes 14 are formed in the first conductive pattern 8 in this manner, the insulating film 1 is turned upside down and a continuous flexible filter paper 15 is superposed on the lower surface of the insulating film 1 to form an integrated insulating film. 1 The filter paper 15 is conveyed downstream and a plurality of second conductive patterns 16 are formed on the back surface which is the upper surface of the insulating film 1 and the fluid conductive paste 1
7 is screen-printed respectively, and the through holes 14 penetrating the first and second conductive patterns 8 and 16 are electrically connected to the conductive paste 17 (see FIGS. 5A and 5B).

At this time, the conductive paste 17 flows into the through holes 14 for conductive connection.
Since the filter paper 15 is already attached, it is possible to prevent the insulating film 1 and the table 7 from being soiled with the conductive paste 17 to some extent. Then, after that, the insulating film 1 and the filter paper 15 are separated, the filter paper 15 is wound up, and the second conductive pattern 16 of the insulating film 1 is dried by the dryer 12, whereby a continuous flexible insulating film 1 is obtained. A conductive pattern can be formed.

[0005]

The conventional method for forming a conductive pattern is as described above, and since the filter paper 15 is simply superposed on the insulating film 1, the insulating film 1 and the filter paper 15 can be conveyed during transportation after screen printing. It is not uncommon for and to cause positional deviation due to the difference in frictional resistance. When such a positional deviation occurs, the conductive paste 17 adheres to the filter paper 15, so that the conductive paste 17 contaminates the insulating film 1 and the like, resulting in a poor appearance and a defective leak.

The present invention has been made in view of the above, and it is possible to prevent the insulating film and the filter paper from being displaced from each other during conveyance after printing, and to prevent the insulating film and the like from having a poor appearance and a leak defect. It is an object of the present invention to provide a method of forming a conductive pattern that can be prevented.

[0007]

In order to achieve the above-mentioned object, a method of forming a conductive pattern on a flexible insulating film, wherein the first surface is formed on the surface of the insulating film. To form a conductive pattern and dry it, open a through hole in this first conductive pattern, reverse the insulating film to the front and back and put a filter paper on the surface to electrostatically adhere, and then to the back surface of the insulating film. It is characterized in that a second conductive pattern is formed and the first and second conductive patterns are electrically connected by the through hole.

Of the above-mentioned insulating film and the filter paper which are in close contact with each other, a charging electrode connected to a power source is opposed to the insulating film and a conductive plate is opposed to the filter paper, and the distance between the charging electrode and the conductive plate is 5 to 15 mm. It is preferable to form it.

Here, the first and second conductive patterns in the claims may be singular or plural, and may be any figure. A screen printing method is mainly used for forming the first and second conductive patterns, but another printing method may be used. When electrostatically contacting the insulating film and the filter paper, a method such as corona discharge or induction charging can be appropriately used under the condition that the insulating film is not damaged.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. A method of forming a conductive pattern in this embodiment will be described with reference to FIG. 1 and FIG. The first conductive pattern 8 is screen-printed on the surface of the film 1 with a conductive paste 9 and dried, the through holes 14 are punched in the first conductive pattern 8, and the insulating film 1 is turned upside down. A flexible filter paper 15 is superposed on the upper surface of the insulating film 1 to be electrostatically charged and adhered thereto, and the second conductive pattern 1 is formed on the back surface of the insulating film 1.
6 by screen printing with conductive paste 17
The second conductive patterns 8 and 16 are electrically connected to the through holes 14 by the conductive paste 17, and then the insulating film 1 and the filter paper 15 are separated to dry the second conductive pattern 16 of the insulating film 1. I have to.

Next, the forming device used for forming the conductive pattern will be explained. As shown in the figure, the forming device for the conductive pattern is an insulating film wound around a roll of a rotary drive shaft from upstream to downstream. 1. Filter paper 15 set upstream of the insulating film 1 and wound around a roll of a rotation drive shaft, a charging device 3, a table 7, a screen printing device 10, and a vertically movable perforation provided with a plurality of needles. Machine 13 (see Fig. 4 in this regard), filter paper 15
And a dryer 12 for the insulating film 1 that uses infrared rays or hot air.

As the insulating film 1, continuous long polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polyethylene naphthalate (P) are used.
Examples thereof include polyesters such as EN), polycarbonate, polyphenylene sulfide, and the like. Among these,
The conductive paste 9 and 17 have excellent adhesion, dimensional stability, and bending resistance, and a thickness of 10 to 50 mm that is stable against light and heat.
Polyethylene terephthalate of is suitable as a material.

The filter paper 15 is made of, for example, synthetic fiber non-woven fabric or porous cellulose paper, and is formed to have a continuous size of approximately the same or slightly smaller so as to cover the surface of the insulating film 1, and has a size of 0.2 to 1.0 mm. Formed to a thickness. The reason why the thickness of the filter paper 15 is in the range of 0.2 to 1.0 mm is that if it is thicker than this range, it will be difficult to handle, and if it is too thin, the conductive paste 17 will wrap around to the back side of the filter paper 15. is there. The retention particle size of the filter paper 15 is formed to be 1 to 5 μm from the viewpoint of improving the passage of air and obtaining smoothness that does not adversely affect screen printing.

As shown in FIG. 2, the charging device 3 is relatively connected to the charging electrode 5 which is connected to the high voltage power source 4 and is close to the upper insulating film 1 with a gap, and the lower filter paper 15. A SUS plate 6 that is a conductive plate to be charged is provided, and a distance L between the charging electrode 5 and the SUS plate 6 that forms the high electric field is 5 to 15 mm, preferably 8 to 12
mm, more preferably 10 mm. The reason that the distance L between the charging electrode 5 and the SUS plate 6 is in the range of 5 to 15 mm is that the charging electrode 5 may come into contact with the insulating film 1 if the distance L is less than 5 mm. On the contrary, 15m
This is because, when it exceeds m, the charge amount is weakened.

The voltage value of the charging device 3 is preferably in the range of 1 to 10 kV, particularly 3 to 5 kV. This is because when it is weaker than 1 kV, the insulating film 1 and the filter paper 15 are weakly adhered to each other and a positional deviation occurs. On the contrary, when it is stronger than 10 kV, the insulating film 1 and the filter paper 15 are strongly adhered. This is because the insulating film 1 and the filter paper 15 cannot be easily separated. As the charging electrode 5, for example, a flat plate, a cylindrical electrode, a thin tungsten wire, a stainless wire or the like can be used.

A large number of suction holes are formed on the work surface of the table 7 side by side in the XY direction, and the many suction holes are connected to a vacuum device (not shown). Screen printing device 10, perforator 13, take-up roll 18, and dryer 1
Well-known techniques are adopted for each item.

In the above structure, when conductive patterns are formed on the front and back surfaces of the continuous flexible insulating film 1, first, the roll-shaped insulating film 1 is placed on the table 7 from the upstream side through a plurality of rollers 2. The insulating film 1 is vacuum-sucked on the table 7, and a plurality of first conductive patterns 8 are screen-printed on the surface which is the upper surface of the table 7 with the fluid conductive paste 9 by the screen printing device 10. 1 to the plurality of rollers 11 from the table 7
The first conductive pattern 8 is conveyed to the downstream dryer 12 via the to dry the first conductive pattern 8 (see FIG. 3 in this regard). As the conductive paste 9, 40 to 95% by weight of conductivity imparting powder of carbon, gold, silver, copper, nickel or the like is contained in a binder such as polyester resin, polyurethane resin, epoxy resin or acrylic resin, and the volume resistivity is 0. .05 to 1
A paste having 0 Ωcm is preferable.

Next, the roll-shaped insulating film 1 is conveyed from the upstream side to the table 7 through a plurality of rollers 2, and the insulating film 1 is vacuum-sucked on the table 7 to form each first conductive pattern on the surface thereof. A through hole 14 is punched from above by a punching machine 13 and is conveyed downstream (see FIG. 4 for this point). At this time, the through hole 1 to be drilled
The diameter of 4 is preferably 0.1 to 0.5 mm. this is,
This is because if it is less than 0.1 mm, the needle of the punching machine 13 is easily broken, and if it exceeds 0.5 mm, it is too large from the viewpoint of wiring density.

Then, the insulating film 1 is turned upside down and wound into a roll, and the roll is set again on the upstream rotary drive shaft. On the upstream side of the insulating film 1, the roll-shaped filter paper 1 is placed.
Set 5. After the insulating film 1 and the filter paper 15 are set in this manner, the insulating film 1 and the filter paper 15 are conveyed in the downstream direction from the upstream through the plurality of rollers 2, and the filter paper 15 is superposed on the lower surface of the insulating film 1. At the same time, the insulating film 1 and the filter paper 15 are electrostatically brought into close contact with each other by static electricity based on the induction charging of the charging device 3 to be laminated and integrated, and are conveyed onto the downstream table 7.

After the integrated insulating film 1 and filter paper 15 are conveyed onto the table 7, the second conductive pattern 16 is formed on the back surface which is the upper surface of the insulating film 1 by vacuum suction on the table 7 and a fluid conductive paste. Screen printing is performed by the screen printing device 10 by means of 17, and the through holes 14 penetrating the first and second conductive patterns 8 and 16 and the conductive paste 17 flowing into the through holes 14 are electrically connected. The conductive paste 17 used at this time preferably has the same composition as the conductive paste 9 for the first conductive pattern 8 from the viewpoint of stability of conduction, but may be different. Then, the integrated insulating film 1 and filter paper 15 are combined into a plurality of rollers 1.
1 through which the filter paper 15 is conveyed to the downstream and the roll 1 is wound up.
After being wound around 8 and peeled off from the insulating film 1, the second conductive pattern 16 of the insulating film 1 is placed on the downstream dryer 12.
When dried, the conductive pattern can be formed on the front and back surfaces of the continuous flexible insulating film 1.

According to the above structure, not only the filter paper 15 is simply superposed on the insulating film 1, but also the filter paper 15 is brought into close contact with each other by applying static electricity to remarkably improve the degree of adhesion. It is possible to very effectively suppress and prevent the displacement of the filter paper 15 due to the difference in frictional resistance value. Therefore, filter paper 1
It is possible to prevent the conductive paste 17 adhering to 5 from contaminating the surface or the like of the insulating film 1 and thereby preventing appearance defects and leak defects from occurring.

[0022]

EXAMPLES Examples of the conductive pattern forming method according to the present invention will be described below. First, a roll-shaped insulating film is conveyed onto a table through a plurality of rollers, the insulating film is vacuum-adsorbed on the table, and a plurality of first conductive patterns are formed on the upper surface, which is a fluid conductive paste. Screen printing was carried out, and the insulating film was conveyed from the table through a plurality of rollers to a downstream dryer to dry each first conductive pattern. As an insulating film, width 5
PET of 00 mm, thickness of 25 μm, and length of 200 m was used. Further, as the conductive paste, commercially available DW-25
0H-5 [trade name of Toyo Boseki Co., Ltd.] was used. Each suction hole of the table had a diameter of 0.5 mm.

Then, the roll-shaped insulating film is conveyed again from upstream to the table through a plurality of rollers, the insulating film is vacuum-adsorbed on the table, and each first conductive pattern on the surface has a diameter of 0.2 mm. The through-hole was punched from above with a punch and conveyed downstream.

Next, the insulating film was turned upside down and wound into a roll, which was set again on the upstream rotary drive shaft, and a roll-shaped filter paper was set upstream of this insulating film. As filter paper, retention particle diameter 2μm, width 400m
m, thickness 0.5 mm, and length 200 m were used.
After setting the insulating film and the filter paper, the insulating film and the filter paper are respectively conveyed from the upstream to the table direction through a plurality of rollers, the filter paper is superposed on the lower surface of the insulating film, and the insulating film and the filter paper are put together. The electrostatic charge of the charging device was used to bring them into close contact with each other by charging, and they were conveyed to a downstream table. 4k for the charging electrode of the charging device
A DC high voltage of V was applied.

After the integrated insulating film and filter paper are conveyed onto the table, they are vacuum-sucked on the table and a second conductive pattern is screen-printed on the back surface which is the upper surface of the insulating film with a fluid conductive paste. The through holes penetrating the first and second conductive patterns were electrically connected with the conductive paste. The conductive paste used at this time was the same as the conductive paste for the first conductive pattern. Then, the integrated insulating film and the filter paper are conveyed downstream via a plurality of rollers, the filter paper is wound on a winding roll and separated from the insulating film, and then the second conductive pattern is dried by a downstream dryer. Dried.

According to the present embodiment, the conductive paste adhered to the filter paper contaminates the insulating film and the like through the through holes, which causes the appearance defect and the leakage defect (the conventional problem is 10 to 30%). ) Can be reduced to zero and it can contribute to the improvement of the product rate.

[0027]

As described above, according to the present invention, it is possible to prevent the positional deviation of the insulating film and the filter paper from occurring during the transportation after the printing of the second conductive pattern, and to prevent the insulating film and the like from having a poor appearance and a leak failure. It is possible to effectively prevent such problems.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment of a conductive pattern forming method according to the present invention.

FIG. 2 is an explanatory view of a main part showing an embodiment of a conductive pattern forming method according to the present invention.

FIG. 3 is an explanatory view showing a conventional method of forming a conductive pattern, and FIG. 3 (a) is an overall view showing a state in which a first conductive pattern is screen-printed with a conductive paste on the surface of an insulating film and then dried. , (B) are explanatory views showing the first conductive pattern in (a).

4A and 4B are explanatory views showing a conventional method for forming a conductive pattern, wherein FIG. 4A is an overall view showing a state where a through hole is punched from above in a first conductive pattern, and FIG. 4B is a punched through hole. It is explanatory drawing which shows a hole.

FIG. 5 is an explanatory view showing a conventional method of forming a conductive pattern, in which (a) is a screen in which a second conductive pattern is printed on the back surface of the insulating film by carrying an integrated insulating film and filter paper with a conductive paste. Then, the first and second conductive patterns are conducted through the through holes, the insulating film and the filter paper are separated, the filter paper is wound up, and the second conductive pattern is dried by a dryer, (b). The figure is an explanatory view showing the second conductive pattern in FIG.

[Explanation of symbols]

1 insulating film 3 charging device 4 High-voltage power supply (power supply) 5 charging electrode 6 SUS plate (conductive plate) 7 table 8 First conductive pattern 9 Conductive paste 10 Screen printing device 12 dryer 14 through holes 15 filter paper 16 Second conductive pattern 17 Conductive paste

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5E317 AA24 BB01 BB12 BB13 BB14                       BB15 CC22 CC25 CD21 CD23                       CD32 GG17                 5E343 AA03 AA12 AA33 BB23 BB24                       BB25 BB44 BB58 BB72 DD03                       ER33 FF02 FF09 FF30 GG20

Claims (2)

[Claims] 1. A method of forming a conductive pattern on a flexible insulating film, comprising forming a first conductive pattern on a surface of the insulating film and drying the conductive film, and forming a through hole in the first conductive pattern. Open, reverse the insulating film, and put a filter paper on the surface to electrostatically adhere it, then form a second conductive pattern on the back surface of the insulating film and pass the first and second conductive patterns through the above. A method for forming a conductive pattern, characterized by electrically connecting through a hole. 2. Of the closely adhered insulating film and the filter paper, a charging electrode connected to a power source is made to face the insulating film, and a conductive plate is made to face the filter paper, and the distance between the charging electrode and the conductive plate is 5 to 15 mm. The method for forming a conductive pattern according to claim 1, wherein the conductive pattern is formed.