JP3707464B2 - Cutting method of prepreg - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cutting a prepreg used for manufacturing a laminated board or the like.
[0002]
[Prior art]
The prepreg is produced in a long shape by impregnating a long base material such as glass cloth or paper with a varnish of a thermosetting resin, followed by drying by heating and semi-curing the thermosetting resin. This prepreg is used by cutting into a square or rectangle having a fixed size by cutting in the longitudinal direction and the width direction orthogonal to the longitudinal direction. For example, a copper-clad laminate can be produced by stacking a plurality of prepregs cut to a fixed size in this manner, stacking a copper foil or the like on both sides thereof, and performing heat and pressure molding.
[0003]
When cutting the prepreg in this way, the cutting process is performed using a cutting blade such as a rotary cutter, shearing, rotary round blade, etc., but the prepreg is a semi-cured state in which a brittle resin adheres to the base material. Therefore, when cutting the prepreg, resin cutting powder and substrate cutting powder are likely to be generated, and these cutting powders may be scattered to the surroundings and impair the working environment. In the next process, the copper foil or the like is overlapped and formed as a foreign substance when forming and causes a defect. In particular, in recent years, with the increasing demand for circuit pattern densification, contamination of foreign matters has been strictly checked, and there is a strong demand to prevent the generation of cutting powder that causes such contamination. ing.
[0004]
Therefore, a method of preventing the generation and scattering of cutting powder by softening the resin of this part by heating the cutting part of the prepreg with an infrared heater or the like and cutting the prepreg at the softened resin part has been studied. Yes. However, when the prepreg is heated with an infrared heater or the like in this way, the prepreg is also widely heated in a portion other than the portion to be cut, and there is a possibility that the resin of the prepreg may be cured in the heated portion, resulting in quality deterioration. there were.
[0005]
In order to solve the above problems, in the following Patent Document 1, the present applicant heats the prepreg resin linearly by irradiating the surface of the prepreg with laser light while moving the irradiation position of the laser light. Then, a method has been proposed in which the prepreg is cut at a portion where the resin has been softened by moving the cutting blade following the movement of the laser light irradiation position.
[0006]
According to this method, since the prepreg is cut at the softened part of the resin, cutting powder can be prevented from being generated, and the prepreg is heated only at the part irradiated with the laser beam. It is possible to soften only the resin to be cut without heating a wide range.
[0007]
However, in this case, since the irradiation position of the laser beam is moved and the cutting blade is moved, a device for moving these is necessary, and there is a problem that the entire cutting device becomes large. there were. Moreover, it is suitable for cutting short prepregs and cutting the prepreg in the width direction, but it is difficult to apply when cutting a long prepreg in the longitudinal direction.
[0008]
Therefore, in the case of cutting a prepreg formed by impregnating a base material with a resin and semi-curing it in Japanese Patent Application No. 2001-392113, the present applicant sent a laser beam to the prepreg with the irradiation position fixed while feeding the prepreg. By irradiating light, the resin of the part of the prepreg irradiated with the laser light is heated and softened, and then the cutting blade disposed in front of the laser light irradiation position from the laser light irradiation position while feeding the prepreg, A prepreg cutting method that cuts a softened portion of a prepreg resin has been proposed. With this, it is not necessary to move the irradiation position of the laser beam or the cutting blade, and as the prepreg is sent, the part where the resin is heated and softened by the irradiation of the laser beam can be cut. The prepreg can be cut while preventing the occurrence of the above.
[0009]
In this case, when the cutting blade is a rotary round blade, the irradiation position where the laser light is irradiated to the prepreg and the prepreg are cut with the cutting blade in consideration of the fact that the laser light irradiated by this round blade is blocked. The distance from the cutting position to be taken was considerably long. However, if the distance between the irradiation position and the cutting position is long in subsequent studies, the output of the laser light emitted from the laser oscillator must be increased in order to maintain the softened state of the prepreg resin at the time of cutting. There is a problem that energy consumption increases, and when the output of the laser beam is increased, the resin of the prepreg is carbonized by the irradiation of the laser beam, and the quality of the prepreg is likely to be deteriorated. It has been found.
[0010]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-138288
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and it is not necessary to move the irradiation position of the laser beam or the cutting blade, can cut the prepreg while preventing the generation of cutting powder, and is long. An object of the present invention is to provide a prepreg cutting method that makes it easy to cut the prepreg in the longitudinal direction and that can reduce the output of laser light emitted from the laser oscillator. .
[0012]
[Means for Solving the Problems]
According to the prepreg cutting method of the invention according to claim 1, when cutting a prepreg formed by impregnating a substrate with a resin and semi-curing, a laser is applied to the prepreg in a state where an irradiation position is fixed while feeding the prepreg. Rotating the center of the prepreg in the feed direction of the prepreg from the irradiation position of the laser light while heating the prepreg resin of the part irradiated with the laser and softening it by irradiating light and then feeding the prepreg A cutting method of a prepreg that cuts a portion of a prepreg that has been softened with a round blade of the formula, and the irradiation position of irradiating the prepreg with a laser beam is determined from a prepreg cutting position that is directly below the center of the round blade The position is within the radial dimension of the round blade.
[0013]
A prepreg cutting method according to a second aspect of the present invention is the prepreg cutting method according to the first aspect, wherein the prepreg is irradiated with a laser beam while the prepreg formed in a long length is fed in the longitudinal direction. The prepreg is cut with a blade.
[0014]
The prepreg cutting method of the invention according to claim 3 is the prepreg cutting method according to claim 1 or 2, wherein the prepreg cutting method is formed by cutting the prepreg with a rotary round blade or directly above the extension line. Laser light is irradiated from a lateral position that is separated from the position.
[0015]
A prepreg cutting method according to a fourth aspect of the present invention is the prepreg cutting method according to the first or second aspect, wherein the position is directly above the extended line of the cutting line formed by cutting the prepreg with a rotary round blade. The laser light irradiation line is inclined with respect to the extended line of the cutting line, and the laser light is irradiated.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0017]
In the prepreg 1, a long base material such as glass cloth or paper is passed through an impregnation tank and impregnated with a varnish of a thermosetting resin such as an epoxy resin, a polyimide resin, or an unsaturated polyester resin, and this is then placed in a heating and drying furnace. It is made by heating and drying, and semi-curing the thermosetting resin into a B-stage state, is formed in a long shape, and is wound around a roll and stored.
[0018]
FIG. 1 shows an embodiment of a method for cutting the prepreg 1 along the longitudinal direction. A rotary round blade 2 for cutting the prepreg 1 and the prepreg 1 between the round blade 2 are shown. The receiving blade 3 to be sandwiched, the laser oscillator 4 that emits the laser light L, the reflection mirror 5 that reflects the laser light L emitted from the laser oscillator 4 and irradiates the prepreg 1, and feed rolls 15 and 15 that send the prepreg 1 And auxiliary feed rolls 16 and 16 for assisting in feeding the prepreg 1 to form a cutting device. In the embodiment shown in FIG. 1, the rotary blade 2 and the receiving blade 3 for sandwiching the prepreg 1 with the circular blade 2 are provided, but depending on the material, thickness, etc. of the prepreg 1, In the present invention, the receiving blade 3 may be omitted and the prepreg 1 may be cut only by the rotary round blade 2. In the embodiment shown in FIG. 1, the rotary round blade 2 is configured to be forcibly rotated, and the receiving blade 3 is configured to be freely rotated. As the laser oscillator 4, for example, a carbon dioxide laser oscillator can be used. The carbon dioxide laser is preferable in the present invention because the output of the emitted laser light can be set appropriately.
[0019]
In this embodiment, as shown in FIG. 2, a long prepreg 1 wound around a roll is fed out by a feed roll 15 and an auxiliary feed roll 16 and fed in the longitudinal direction. Cutting is performed along the longitudinal direction. The reflection mirror 5 is disposed above the prepreg 1, reflects the laser light L emitted from the laser oscillator 4, and feeds the prepreg 1 from a position directly below the center 7 of the rotary round blade 2. The surface of the prepreg 1 is irradiated at the rear position. Then, as shown in FIG. 3, the irradiation position 6 for irradiating the prepreg 1 with the laser beam L is within the radius r of the round blade 2 from the prepreg cutting point 8 located immediately below the center 7 of the rotary round blade 2. And position. In this embodiment, as shown in FIG. 2, the lateral position is separated from the position immediately above the extension line 10 of the cutting line 9 formed by cutting the prepreg 1 with the rotary round blade 2. Since the laser beam L is irradiated onto the prepreg 1 from the reflection mirror 5 installed in the laser beam L, the laser beam L is not blocked by the round blade 2, and therefore, a position directly below the center 7 of the round blade 2. It is possible to easily irradiate the laser beam L to a position within the radial dimension r of the round blade 2 from the prepreg cutting point 8 in FIG.
[0020]
In the cutting method of this embodiment, the surface of the prepreg 1 is irradiated with the laser light L at a position behind the center 7 of the round blade 2 in the feed direction of the prepreg 1. When the prepreg 1 is thus irradiated with the laser light L, the portion irradiated with the laser light L is heated, and the resin in that portion is softened. At this time, since the prepreg 1 is continuously fed in the longitudinal direction by the feed roll 15, the resin softened portion 11 (see FIG. 3) in which the resin is softened is formed in a straight line shape. Is further fed in the longitudinal direction by the feed roll 15, the linear resin softened portion 11 passes through the round blade 2, and the prepreg 1 is cut along the resin softened portion 11 by the round blade 2. Therefore, the cutting method of this embodiment does not need to move the irradiation position of the laser beam L or the round blade 2, can cut the prepreg while preventing the generation of cutting powder, and the long prepreg 1 This is a method for cutting a prepreg that makes it easy to cut the wire in the longitudinal direction.
[0021]
Furthermore, in the cutting method of this embodiment, the radial dimension of the round blade 2 from the prepreg cutting point 8 located immediately below the center 7 of the rotary round blade 2 with respect to the irradiation position 6 where the laser beam L is irradiated to the prepreg 1. Compared to the case where the irradiation position for irradiating the laser beam L is farther than the radial dimension r of the round blade 2 from the prepreg cutting point 8 located immediately below the center 7 of the rotary round blade 2 because the position is within r. After the laser beam L is irradiated, the time until the portion irradiated with the laser beam L passes through the round blade 2 is shortened, so that the output of the laser beam L emitted from the laser oscillator 4 can be reduced. it can. This is because when the irradiation position 6 where the laser beam L is irradiated is far from the prepreg cutting portion 8, the prepreg 1 is cooled while the prepreg 1 is moved from the irradiation position 6 to the prepreg cutting portion 8, so that the resin softened portion 11 In order to maintain the softened state of prepreg up to the prepreg cutting point 8, it is necessary to increase the output of the laser light L and to raise the temperature of the prepreg 1 at the irradiation position 6, but the irradiation position where the laser light L is irradiated When 6 is close to the prepreg cutting point 8, the degree of cooling of the prepreg 1 during the movement of the prepreg 1 from the irradiation position 6 to the prepreg cutting point 8 is small, so that the output of the laser light L emitted from the laser oscillator 4 It is because it becomes possible to make small.
[0022]
Next, another embodiment of a method for cutting the prepreg 1 along the longitudinal direction will be described. FIG. 4 shows another embodiment of a method for cutting the prepreg 1 along the longitudinal direction, and the installation position of the laser oscillator 4 and the reflection mirror 5 is different from the embodiment shown in FIG. Yes. In the embodiment shown in FIG. 4, the long prepreg 1 wound around the roll is fed out by the feed roll 15 and the auxiliary feed roll 16 and fed in the longitudinal direction, and cut along the longitudinal direction by the rotary round blade 2. I am doing so. The reflection mirror 5 is disposed above the prepreg 1, reflects the laser light L emitted from the laser oscillator 4, and feeds the prepreg 1 from a position directly below the center 7 of the rotary round blade 2. The surface of the prepreg 1 is irradiated at the rear position. Then, as shown in FIG. 6, the irradiation position 6 for irradiating the prepreg 1 with the laser beam L is within the radial dimension r of the round blade 2 from the prepreg cutting point 8 located immediately below the center 7 of the rotary round blade 2. And position. And in this embodiment, as shown in FIG. 5, from the reflecting mirror 5 installed in the position right above the extension line 10 of the cutting line 9 formed by cutting the prepreg 1 with the rotary round blade 2. The prepreg 1 is irradiated with the laser beam L. Further, by adjusting the installation position and the installation angle of the laser oscillator 4 and the reflection mirror 5, the irradiation line 12 of the laser light L is inclined with respect to the extension line 10 of the cutting line 9, and the laser light L is applied to the prepreg 1. Since the irradiation is performed, the laser beam L is not blocked by the round blade 2, and therefore, as shown in FIG. 6, the round blade 2 starts from the prepreg cutting point 8 located immediately below the center 7 of the round blade 2. It is possible to easily irradiate the laser beam L to a position within the radial dimension r.
[0023]
In the cutting method of the embodiment shown in FIG. 4, the surface of the prepreg 1 is irradiated with the laser beam L at a position behind the center 7 of the round blade 2 in the feed direction of the prepreg 1. When the prepreg 1 is thus irradiated with the laser light L, the portion irradiated with the laser light L is heated, and the resin in that portion is softened. At this time, since the prepreg 1 is continuously fed in the longitudinal direction by the feed roll 15, the resin softened portion 11 (see FIG. 6) in which the resin is softened is formed in a straight line shape. Is further fed in the longitudinal direction by the feed roll 15, the linear resin softened portion 11 passes through the round blade 2, and the prepreg 1 is cut along the resin softened portion 11 by the round blade 2. Therefore, the cutting method of the embodiment shown in FIG. 4 does not need to move the irradiation position of the laser beam L or the round blade 2, can cut the prepreg while preventing generation of cutting powder, and is long. This prepreg cutting method makes it easy to cut the prepreg 1 in the longitudinal direction.
[0024]
Further, in the cutting method according to the embodiment shown in FIG. 4, the round blades from the prepreg cutting point 8 at the position directly below the center 7 of the rotary round blade 2 with respect to the irradiation position 6 where the laser beam L is irradiated to the prepreg 1. Since the position is within the radial dimension r of 2, the irradiation position for irradiating the laser beam L is farther than the radial dimension r of the round blade 2 from the prepreg cutting point 8 located immediately below the center 7 of the rotary round blade 2. Compared to the case, after the laser beam L is irradiated, the time until the portion irradiated with the laser beam L passes through the round blade 2 is shortened. Therefore, the output of the laser beam L emitted from the laser oscillator 4 is reduced. Can be small. This is because when the irradiation position 6 where the laser beam L is irradiated is far from the prepreg cutting portion 8, the prepreg 1 is cooled while the prepreg 1 is moved from the irradiation position 6 to the prepreg cutting portion 8, so that the resin softened portion 11 In order to maintain the softened state of prepreg up to the prepreg cutting point 8, it is necessary to increase the output of the laser light L and to raise the temperature of the prepreg 1 at the irradiation position 6, but the irradiation position where the laser light L is irradiated When 6 is close to the prepreg cutting point 8, the degree of cooling of the prepreg 1 during the movement of the prepreg 1 from the irradiation position 6 to the prepreg cutting point 8 is small, so that the output of the laser light L emitted from the laser oscillator 4 It is because it becomes possible to make small.
[0025]
In each of the above embodiments, the long prepreg 1 is cut while being fed in the longitudinal direction. However, the present invention is also applicable to cutting while feeding a prepreg 1 having a fixed length such as a rectangle. It is.
[0026]
【The invention's effect】
In the prepreg cutting method according to the first aspect of the present invention, when cutting a prepreg formed by impregnating a base material with a resin and semi-curing, a laser is applied to the prepreg in a state where an irradiation position is fixed while feeding the prepreg. By irradiating light, the resin of the prepreg irradiated with the laser light is heated and softened, and then the center is disposed in front of the prepreg feed direction from the laser light irradiation position while feeding the prepreg. A prepreg cutting method for cutting a softened part of a prepreg resin with a rotary round blade, where the irradiation position for irradiating the prepreg with a laser beam is a prepreg cutting location located immediately below the center of the round blade The cutting method of the prepreg of the invention according to claim 1 According to this, it is not necessary to move the irradiation position of the laser beam or the cutting blade, the prepreg can be cut while preventing the generation of cutting powder, and the output of the laser beam emitted from the laser oscillator is reduced. It becomes possible.
[0027]
The prepreg cutting method of the invention according to claim 2 is the prepreg cutting method according to claim 1, wherein the prepreg is irradiated with a laser beam while feeding the prepreg formed in a long direction in the longitudinal direction, and a rotating round Since the prepreg is cut with the blade, in addition to the effect of the invention according to claim 1, there is also an effect that a long prepreg can be cut in the longitudinal direction.
[0028]
In the prepreg cutting method according to the invention according to claim 3 and the invention according to claim 4, in addition to the effect of the invention according to claim 1, the radial dimension of the round blade from the prepreg cutting location at the position directly below the center of the round blade. There is also an effect that it is possible to easily irradiate the laser beam within the position.
[Brief description of the drawings]
FIG. 1 is a schematic side view for explaining an embodiment of the present invention.
FIG. 2 is a schematic plan view of the above.
FIG. 3 is a schematic cross-sectional view of the main part of the above.
FIG. 4 is a schematic side view for explaining another embodiment of the present invention.
FIG. 5 is a schematic plan view of the above.
FIG. 6 is a schematic sectional view of the main part of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Prepreg 2 Round blade 3 Receiving blade 4 Laser oscillator 5 Reflection mirror 6 Irradiation position 7 Center 8 Cutting part 9 Cutting line 10 Extension line 11 Resin softening part 12 Irradiation line 15 Feed roll 16 Auxiliary feed roll L Laser beam r Radius size

Claims (4)

In cutting the prepreg formed by impregnating the substrate with resin and semi-curing, the part irradiated with laser light by irradiating the prepreg with laser light while feeding the prepreg while fixing the irradiation position The prepreg resin was heated and softened, and then the prepreg resin was softened with a rotary round blade whose center was placed in front of the laser beam irradiation position in the prepreg feed direction while feeding the prepreg. A method of cutting a prepreg that cuts a portion, wherein an irradiation position of irradiating a laser beam to the prepreg is set to a position within a radial dimension of the round blade from a prepreg cutting position at a position immediately below the center of the round blade. A prepreg cutting method characterized. 2. The prepreg cutting method according to claim 1, wherein the prepreg is irradiated with laser light while the prepreg formed in a long length is fed in the longitudinal direction, and the prepreg is cut with a rotary round blade. The laser beam is irradiated from a lateral position that is separated from a cutting line formed by cutting a prepreg with a rotary round blade or a position directly above the cutting line. The method for cutting a prepreg according to 2. The laser beam is irradiated from the position directly above the extended line of the cutting line formed by cutting the prepreg with a rotary round blade and irradiated with the laser beam. The method for cutting a prepreg according to claim 1 or 2.

Images