JP2000176357A - Production of film for flexible printed double-sided substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a synthetic resin to both surfaces of a film as uniformly as possible. SOLUTION: In a method for applying a synthetic resin to both surfaces of a continuously supplied film 1, the synthetic resin is applied to the outer surface of the film by a coating part 2 in such a state that the inner surface of the film 1 is supported by a receiving member 3 and, succeedingly, the synthetic resin is applied to the inner surface of the horizontally running film 1 by a coating part 4 immediately before the film is introduced into a horizontally provided drying zone 7 and, thereafter, the film 1 is introduced into the drying zone 7 to be semi-cured or cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin coating method for coating a synthetic resin such as an epoxy resin on both surfaces of a film.

[0002]

2. Description of the Related Art As a method of applying a synthetic resin to both sides of a film, there is a method of applying a synthetic resin to each side of the film. However, a method of applying a synthetic resin to each side of the film is as follows. Conventionally, as a method for simultaneously applying the epoxy resin 31 to both surfaces of the film 32, as shown in FIG. 1, a continuously supplied film 32 is passed through a resin bath 33 because it is very complicated. Spread epoxy resin 31 on both sides of the film 32 in,
Subsequently, there is a method in which the epoxy resin 31 is semi-cured or cured by passing through a drying zone 34 (hereinafter, referred to as a first conventional example).

In this first conventional example, the epoxy resin 31 is applied to the film 32 by passing the film 32 through a resin bath 33 (dipping method), so that the thickness (adhesion amount) of the applied resin varies. It is difficult to form a thin coating layer, and the drying zone 34 is vertical so that the weight of the epoxy resin 31 acts on the film 32, that is, the film 32 is dried in a state where tension is applied to the film 32. However, there is a drawback that good dimensional accuracy cannot be expected because of this.

As another double-side coating method, as shown in FIG. 2, an epoxy resin is coated on a first surface of a continuously supplied film 41 using a known coater 42 and a receiving roll 43, Subsequently, the epoxy resin is volatilized in a preliminary drying zone 44 to evaporate the solvent. Subsequently, using a known coater 45 and a receiving roll 46 (the surfaces of the receiving roll 46 and the guide roll 48 are Teflon-treated to prevent adhesion). There is a method in which an epoxy resin is applied to the second surface of the film 41, and then the epoxy resin of the second surface and the epoxy resin of the first surface are B-staged or C-staged in the main drying zone 47 ( Hereinafter, this will be referred to as a second conventional example.)

In the second conventional example, the drying zone is provided horizontally, so that there is no problem that the film is dried with tension applied as in the first conventional example, but two drying zones are required. In this respect, the equipment cost is high, and the quality is uneven because two heating steps are performed.

Further, as another double-side coating method, as shown in FIG. 3, an epoxy resin is coated on the first surface and the second surface of the film 51 at the same position by the coaters 53 and 54, and then dried. There is a method of drying in the zone 52 (hereinafter, referred to as a third conventional example).

As a known coater, as shown in FIG. 4, a bar coater 64 for bringing a film 63 into contact with a resin 62 of a liquid reservoir 61 and applying the resin 62 to the film 63 by running the film 63 is used. As shown in FIG. 5, there has been proposed a die coater 66 for spraying the resin 62 under pressure to apply the resin 62 to the film 63. Reference numeral 65 denotes a backup roll, and 67 denotes a pressure pump.

The third conventional example is a method in which drying under tension is eliminated as in the first conventional example, and providing two drying zones as in the second conventional example is avoided. Therefore, the coaters 53 and 54 must be located immediately before the drying zone 52, and the coaters 53 and 54 must be die coaters 66. (Because the bar coater 64 does not inject resin by pressure, It is difficult to apply it to a film running horizontally.)

However, it is difficult to apply the resin on both sides of the film 51 from above and below by the die coater 66 as described above.
Since there is no receiving roll, there is a drawback that wrinkles are easily generated in the film, and therefore, the resin coating thickness on the first and second surfaces of the film becomes uneven.

The present invention has solved the above-mentioned drawbacks of the conventional examples. In particular, there is a strong demand for uniformity of the resin thickness, and flatness with less wrinkles is required. It is an object of the present invention to provide a resin coating method that can be applied to, for example, a flexible printed double-sided board or the like that requires the same thickness of the coating layers on both sides.

[0011]

The gist of the present invention will be described with reference to the accompanying drawings.

This is a method in which the synthetic resin 8 is applied to both sides of the continuously supplied film 1. The synthetic resin 8 is applied to the outer surface of the film 1 by the coating unit 2, and the inner surface of the film 1 is received by the receiving body 3. Immediately before the film 1 is introduced into the horizontally provided drying zone 7, the inner surface of the horizontally running film 1 is coated with the synthetic resin by the coating unit 4 having the following structure immediately before the film 1 is introduced into the drying zone 7. 8, and thereafter, the film 1 is introduced into the drying zone 7 to semi-cur or cure the synthetic resin 8.

A coating unit 4 for applying a synthetic resin 8 to the inner surface of the film 1
Has a resin injection section 5 at the tip thereof, and the resin injection section 5 is located at a position where a predetermined gap 9 is interposed between the film 1 and the film supply side of the resin injection section 5. A structure in which an abutting portion 6 is provided to bend when the abutment 1 abuts.

[0014]

First, a synthetic resin 8 is applied to the outer surface of the film 1. For this coating, use a bar coater 6
4, any of the die coaters 66 may be used,
Further, since the inner surface of the film 1 is supported by the receiving body 3, the synthetic resin 8 can be applied well and uniformly without wrinkles or the like on the film 1.

Subsequently, a synthetic resin 8 is applied to the inner surface of the film 1 immediately before being introduced into the drying zone 7.

At the time of this coating, a horizontal drying zone 7 is employed in order to realize the drying without the weight of the film 1, the synthetic resin 8 and the solvent being added to the film 1.
Inevitably, a method of injecting the synthetic resin 8 such as the die coater 66 is employed. When applying the synthetic resin 8 to the inner surface of the film 1, a backup roll cannot be used because the outer surface of the film 1 is in a wet state.

Therefore, the coating portion 4 of the present invention has a contact portion 6 with which the film 1 contacts and is bent, and the contact portion 6 has the same function as the receiving body 3 (backup for receiving the film 1). Film 1)
The synthetic resin 8 can be applied without causing wrinkles or the like. Further, unlike the backup roll prepared separately, the contact portion 6 is provided in the coating portion itself, so that the line can be assembled more efficiently.

As described above, according to the present invention, it is possible to obtain the film 1 on which the synthetic resin 8 is applied as uniformly as possible, flat and with the same thickness on both sides.

[0019]

FIG. 6 shows an embodiment of the present invention, which will be described below.

An outer surface of a continuously supplied film 1 (for example, a polyimide film or a polyester film) is coated by a coating unit 2, that is, by a bar coater 64 shown in FIG. 4 or a die coater 66 shown in FIG. The synthetic resin 8 (for example, epoxy resin) is applied, and the synthetic resin 8 is applied to the inner surface of the film 1 by the coating unit 4, that is, the coater shown in FIG. 7 immediately before being introduced into the drying zone 7.

The coater shown in FIG. 7 is provided with a protruding portion (abutting portion 6) on the film supply side of the resin injection section 5, and supplies the film 1 from the lower left side in FIG.
Is bent by the protrusion, and the film 1 presses the protrusion (predetermined tension is applied to the film 1), so that the protrusion performs the function of a backup roll. One wrinkle can be prevented as much as possible. Then, the synthetic resin 8 is spray-coated from the resin injection unit 5 at a position where the effect of the protrusion does not disappear, that is, at a position as close as possible to the protrusion (a gap 9 exists between the resin injection unit 5 and the film 1). Non-contact state).

Reference numeral 10 denotes a guide roll.

Therefore, when the synthetic resin 8 is applied to the film 1 by the method according to the present embodiment, the synthetic resin 8 is applied as evenly and flatly as possible, so that the copper foil is applied to the film 1. By combining them, a highly accurate flexible printed double-sided board can be obtained.

The drying zone 7 in the drawing is for the film 1
In order to prevent wrinkles or the like from being generated, a so-called floating structure drying zone 7 in which the film 1 travels in a non-contact state with the surroundings is employed.

In applying the synthetic resin to the outer surface of the film 1 in this embodiment, the coater shown in FIG. 7 may be employed, but the function of supporting the film by the backup roll is the contact portion 6 of the coater shown in FIG. Since it is better than the film supporting function, the bar coater 64 and the backup roll 65 shown in FIG. 4 or the die coater 66 and the backup roll 65 shown in FIG. 5 are used when applying the synthetic resin 8 to the outer surface. It is desirable to do. Further, if the outer surface is coated with the synthetic resin 8 by using the backup roll 65 shown in FIG. 4 or FIG.
When the coater shown in FIG. 1 is removed from the line, a line that can immediately apply the synthetic resin 8 on one side well, that is, a line of the flexible single-sided substrate is completed. It is better not to use the coater shown in FIG.

The present invention can of course be applied to a double-sided adhesive sheet or the like in addition to a flexible printed double-sided board.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first conventional example.

FIG. 2 is an explanatory diagram of a second conventional example.

FIG. 3 is an explanatory diagram of a third conventional example.

FIG. 4 is an explanatory diagram of a bar coater.

FIG. 5 is an explanatory diagram of a die coater.

FIG. 6 is a process explanatory view of the present embodiment.

FIG. 7 is an explanatory diagram of a coater of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film 2 Coating part 3 Receiver 4 Coating part 5 Resin injection part 6 Contact part 7 Drying zone 8 Synthetic resin 9 Gap

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 6, 2000 (200.3.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Fi for a flexible printed double-sided board
Manufacturing method of LUM

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible film for coating a synthetic resin such as an epoxy resin on both surfaces of a film.
The present invention relates to a method for producing a film for a double-sided printed board .

[0002]

2. Description of the Related Art As a method of applying a synthetic resin to both sides of a film, there is a method of applying a synthetic resin to each side of the film. However, a method of applying a synthetic resin to each side of the film is as follows. Conventionally, as a method for simultaneously applying the epoxy resin 31 to both surfaces of the film 32, as shown in FIG. 1, a continuously supplied film 32 is passed through a resin bath 33 because it is very complicated. Spread epoxy resin 31 on both sides of the film 32 in,
Subsequently, there is a method in which the epoxy resin 31 is semi-cured or cured by passing through a drying zone 34 (hereinafter, referred to as a first conventional example).

In this first conventional example, the epoxy resin 31 is applied to the film 32 by passing the film 32 through a resin bath 33 (dipping method), so that the thickness (adhesion amount) of the applied resin varies. It is difficult to form a thin coating layer, and the drying zone 34 is a vertical type. However, there is a drawback that good dimensional accuracy cannot be expected because of this.

As another double-side coating method, as shown in FIG. 2, an epoxy resin is coated on a first surface of a continuously supplied film 41 using a known coater 42 and a receiving roll 43, Subsequently, the epoxy resin is volatilized in a preliminary drying zone 44 to evaporate the solvent. Subsequently, using a known coater 45 and a receiving roll 46 (the surfaces of the receiving roll 46 and the guide roll 48 are Teflon-treated to prevent adhesion). There is a method in which an epoxy resin is applied to the second surface of the film 41, and then the epoxy resin of the second surface and the epoxy resin of the first surface are B-staged or C-staged in the main drying zone 47 ( Hereinafter, this will be referred to as a second conventional example.)

In the second conventional example, the drying zone is provided horizontally, so that there is no problem that the film is dried with tension applied as in the first conventional example, but two drying zones are required. In this respect, the equipment cost is high, and the quality is uneven because two heating steps are performed.

Further, as another double-side coating method, as shown in FIG. 3, an epoxy resin is coated on the first surface and the second surface of the film 51 at the same position by the coaters 53 and 54, and then dried. There is a method of drying in the zone 52 (hereinafter, referred to as a third conventional example).

As a known coater, as shown in FIG. 4, a bar coater 64 for bringing a film 63 into contact with a resin 62 of a liquid reservoir 61 and applying the resin 62 to the film 63 by running the film 63 is used. As shown in FIG. 5, there has been proposed a die coater 66 for spraying the resin 62 under pressure to apply the resin 62 to the film 63. Reference numeral 65 denotes a backup roll, and 67 denotes a pressure pump.

The third conventional example is a method in which drying under tension is eliminated as in the first conventional example, and providing two drying zones as in the second conventional example is avoided. Therefore, the coaters 53 and 54 must be located immediately before the drying zone 52, and the coaters 53 and 54 must be die coaters 66. (Because the bar coater 64 does not inject resin by pressure, It is difficult to apply it to a film running horizontally.)

However, it is difficult to apply the resin on both sides of the film 51 from above and below by the die coater 66 as described above.
Since there is no receiving roll, there is a drawback that wrinkles are easily generated in the film, and therefore, the resin coating thickness on the first and second surfaces of the film becomes uneven.

The present invention has solved the above-mentioned drawbacks of the conventional examples. In particular, there is a strong demand for uniformity of the resin thickness, and flatness with less wrinkles is required. the thickness of both sides of the coating layer is Ru is requested, full of resin the coating method that can be implemented to full lexical Bull printed double-sided board
It is intended to provide a method for producing a film for a flexible printed double-sided board .

[0011]

The gist of the present invention will be described with reference to the accompanying drawings.

A synthetic resin 8 is applied to both sides of a continuously supplied film 1 to form a flexible printed double-sided board.
In the method of manufacturing a film for use , a synthetic resin 8 is applied to the outer surface of the film 1 by a coating unit 2 while the inner surface of the film 1 is supported by a receiving body 3.
Immediately before introducing into a drying zone 7 provided horizontally, a synthetic resin 8 is applied to the inner surface of the film 1 traveling horizontally by a coating section 4 having the following structure. is introduced into 7 is semi-cured or curing the synthetic resin 8, into a film 1 both surfaces of the coating layer is the same thickness
Produces flexible printed double-sided film
Flexible printed double-sided board, which comprises forming
The present invention relates to a method for producing a film for use . A coating unit 4 for applying a synthetic resin 8 to the inner surface of the film 1
Has a resin injection section 5 at the tip thereof, and the resin injection section 5 is located at a position where a predetermined gap 9 is interposed between the film 1 and the film supply side of the resin injection section 5. A structure in which an abutting portion 6 is provided to bend when the abutment 1 abuts.

[0013]

First, a synthetic resin 8 is applied to the outer surface of the film 1. For this coating, use a bar coater 6
4, any of the die coaters 66 may be used,
Further, since the inner surface of the film 1 is supported by the receiving body 3, the synthetic resin 8 can be applied well and uniformly without wrinkles or the like on the film 1.

Subsequently, a synthetic resin 8 is applied to the inner surface of the film 1 immediately before being introduced into the drying zone 7.

At the time of this coating, a horizontal drying zone 7 is employed in order to realize drying without adding the weight of the film 1, the synthetic resin 8 and the solvent to the film 1.
Inevitably, a method of injecting the synthetic resin 8 such as the die coater 66 is employed. When applying the synthetic resin 8 to the inner surface of the film 1, a backup roll cannot be used because the outer surface of the film 1 is in a wet state.

Therefore, the coating section 4 of the present invention has a contact section 6 against which the film 1 is contacted and bent, and the contact section 6 has the same function as the receiving body 3 (backup for receiving the film 1). Film 1)
The synthetic resin 8 can be applied without causing wrinkles or the like. Further, unlike the backup roll prepared separately, the contact portion 6 is provided in the coating portion itself, so that the line can be assembled more efficiently.

As described above, according to the present invention, it is possible to obtain a method of manufacturing a film for a flexible printed double-sided substrate in which the synthetic resin 8 is applied as uniformly as possible, flatly, and with the same thickness on both sides. Becomes possible.

[0018]

FIG. 6 shows an embodiment of the present invention, which will be described below.

An outer surface of a continuously supplied film 1 (for example, a polyimide film or a polyester film) is coated by a coating unit 2, that is, by a bar coater 64 shown in FIG. 4 or a die coater 66 shown in FIG. The synthetic resin 8 (for example, epoxy resin) is applied, and the synthetic resin 8 is applied to the inner surface of the film 1 by the coating unit 4, that is, the coater shown in FIG. 7 immediately before being introduced into the drying zone 7.

The coater shown in FIG. 7 is provided with a protruding portion (contact portion 6) on the film supply side of the resin injection section 5, and supplies the film 1 from the lower left side in FIG.
Is bent by the protrusion, and the film 1 presses the protrusion (predetermined tension is applied to the film 1), so that the protrusion performs the function of a backup roll. One wrinkle can be prevented as much as possible. Then, the synthetic resin 8 is spray-coated from the resin injection unit 5 at a position where the effect of the protrusion does not disappear, that is, at a position as close as possible to the protrusion (a gap 9 exists between the resin injection unit 5 and the film 1). Non-contact state).

Reference numeral 10 denotes a guide roll.

Therefore, when the synthetic resin 8 is applied to the film 1 by the method according to the above-described embodiment, the synthetic resin 8 is applied as uniformly and flatly as possible. By combining them, a highly accurate flexible printed double-sided board can be obtained.

In the drawing, the drying zone 7 is the film 1
In order to prevent wrinkles or the like from being generated, a so-called floating structure drying zone 7 in which the film 1 travels in a non-contact state with the surroundings is employed.

In applying the synthetic resin to the outer surface of the film 1 in this embodiment, the coater shown in FIG. 7 may be employed, but the function of supporting the film by the backup roll is the contact portion 6 of the coater shown in FIG. Since it is better than the film supporting function, the bar coater 64 and the backup roll 65 shown in FIG. 4 or the die coater 66 and the backup roll 65 shown in FIG. 5 are used when applying the synthetic resin 8 to the outer surface. It is desirable to do. Further, if the outer surface is coated with the synthetic resin 8 by using the backup roll 65 shown in FIG. 4 or FIG.
When the coater shown in FIG. 1 is removed from the line, a line that can immediately apply the synthetic resin 8 on one side well, that is, a line of the flexible single-sided substrate is completed. It is better not to use the coater shown in FIG.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first conventional example.

FIG. 2 is an explanatory diagram of a second conventional example.

FIG. 3 is an explanatory diagram of a third conventional example.

FIG. 4 is an explanatory diagram of a bar coater.

FIG. 5 is an explanatory diagram of a die coater.

FIG. 6 is a process explanatory view of the present embodiment.

FIG. 7 is an explanatory diagram of a coater according to the present embodiment.

[Description of Signs] 1 Film 2 Coating part 3 Receiver 4 Coating part 5 Resin injection part 6 Contact part 7 Dry zone 8 Synthetic resin 9 Gap

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C08L 67:00 (72) Inventor Satoshi Shinohara 1-5-5 Minamihonmachi, Joetsu-shi, Niigata Prefecture Arisawa Manufacturing Co., Ltd. (72) Inventor Naoshi Sakai 1-5-5 Minamihonmachi, Joetsu City, Niigata Prefecture Inside Arisawa Manufacturing Co., Ltd. (72) Inventor Toshio Yokoyama 1-5-5 Minamihonmachi, Joetsu City, Niigata Prefecture F inside Arisawa Manufacturing Company F Terms (reference) 4D075 AC03 AC72 AC80 AE24 BB24Z BB26Z DA04 EB33 4F006 AA35 AA39 AB34 CA08 DA05 EA05

Claims (1)

[Claims] 1. A method for applying a synthetic resin to both sides of a continuously supplied film, wherein the synthetic resin is applied to an outer surface of the film by a coating unit, and the inner surface of the film is supported by a receiving body. Immediately before the film is introduced into a horizontally provided drying zone, a synthetic resin is applied to the inner surface of the horizontally running film by a coating unit having the following structure, and then the film is applied. Is introduced into a drying zone to semi-cur or cure the synthetic resin. The coating section for applying the synthetic resin to the inner surface of the film has a resin injection section at the tip, and the resin injection section is located at a position where a predetermined gap is interposed between the film and the resin injection section. A structure in which a contact portion is provided on the film supply side of the portion so that the film abuts and is bent.