JP2003145536A - Method for manufacturing prepreg and prepreg smoothing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a prepreg by which the surface of a prepreg can be smoothed without carrying over deposits such as resin powder into a following step and a prepreg smoothing device used in the method for manufacturing a prepreg. SOLUTION: This method for manufacturing a prepreg comprises the steps to impregnate a glass base material 11 with a resin composition 12, then heat the resin composition 12 with the help of a dryer 14 to obtain the prepreg 1 cured in a B-stage condition and pinch/pressurize the prepreg 1 between a pair of pressurizing rolls 2 and 2. Further, the method comprises the steps to collapse and smooth the projecting part of the surface of the prepreg 1 between the paired pressurizing rolls 2 and 2, then introduce the prepreg 1 into a cleaner and thereby, remove deposits including the resin powder sticking to the surface of the prepreg 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prepreg manufacturing method and a prepreg smoothing apparatus, which can obtain a prepreg having a smooth surface.

[0002]

2. Description of the Related Art In a prepreg, a glass substrate is impregnated with a resin composition containing a thermosetting resin such as an epoxy resin or a polyimide resin and then heated in a drier so that the resin composition is in a B stage state ( It is manufactured by curing to a semi-cured state. The prepreg is used, for example, in a copper clad laminate used in a multilayer printed wiring board or the like. 2. Description of the Related Art In recent years, the quality of printed wiring boards required has become strict with the demand for higher density wiring and thinner wiring. Even in the above prepreg, the smoothness of the surface is required, and it is required that the surface of the prepreg does not have a convex portion due to a resin pool or the like. When a copper-clad laminate is manufactured using a prepreg that has convexities due to resin pools or the like and has poor smoothness, the copper-clad laminate is prone to wrinkles and dents on the surface of the copper foil. When a circuit is formed, residual copper and open defects are likely to occur at these irregularities, resulting in short circuit defects and conduction defects.

[0003]

As a method for producing a smooth prepreg, a method of reheating the prepreg and then pressing a convex portion formed on the surface of the prepreg with a roll (for example, JP-A-9-174546). Gazettes) are known. When producing a prepreg by this method, depending on the production conditions such as reheating conditions, a large amount of resin powder is generated when the convex portion is pressed by a roll, and this resin powder is scattered in the subsequent step, and copper When the stretched laminated plate is produced, it may be attached to the copper foil surface to form a dent called a dent.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a prepreg capable of smoothing the surface of the prepreg without introducing a deposit such as a resin powder into a subsequent step. It is intended to provide a manufacturing method and a prepreg smoothing device used in the prepreg manufacturing method.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above-mentioned object, and as a result, generated when the convex portion of the prepreg was pressed by a pressure roll and adhered to the prepreg. Air is blown against the adhered substances such as resin powder, and the adhered substances are removed by sucking the scattered substances with a non-contact type cleaner device. It was found that the prepreg can be obtained and a smooth prepreg can be obtained without damaging the surface, and the present invention has been completed.

In the method for producing a prepreg according to the first aspect of the present invention, a glass base material is impregnated with the resin composition and heated in a dryer to cure the resin composition in a B-stage state. In a method of manufacturing a prepreg which is sandwiched and pressed by rolls, the convex portions of the prepreg surface are crushed and smoothed by the pair of pressure rolls, then the prepreg is introduced into a cleaner step, and the resin adhered to the surface of the prepreg. It is characterized in that the deposits containing powder are removed.

According to a second aspect of the present invention, there is provided a method for producing a prepreg according to the first aspect,
The above-mentioned cleaning step is characterized in that a non-contact type cleaner device is arranged which blows air onto the surface of the prepreg from the side opposite to the advancing direction to scatter adhered matters and sucks the scattered matters. In this way, when air is blown to scatter the adhered matter and the scattered matter is sucked, the adhered matter can be removed more sufficiently than the simple suction, and the surface of the prepreg is damaged. Without this, a smooth prepreg can be obtained.

According to a third aspect of the present invention, there is provided a method for producing a prepreg according to the first or second aspect, wherein the cleaner step is provided with an electrostatic removal bar. . In many cases, the adhered matter is electrostatically adhered to the surface of the prepreg, and the use of an electrostatic removal bar makes it easier for the adhered matter to come off the surface of the prepreg, thus improving the efficiency of removing the adhered matter. You can

According to a fourth aspect of the present invention, there is provided a method for producing a prepreg according to any one of the first to third aspects, wherein the prepreg that has passed through the cleaning step is heated to melt only the vicinity of the surface. It is characterized by As described above, the resin powder attached to the surface is melted to prevent the resin powder from scattering.

A method for producing a prepreg according to a fifth aspect of the present invention is the method for producing a prepreg according to any one of the first to fourth aspects, wherein the pressure roll removes deposits adhering to the pressure roll. It is characterized by being equipped with a roll cleaner. Due to the above, there is a possibility that the resin powder may adhere to the pressure roll due to long-term use, but since this can be prevented, the smoothness of the pressure roll surface can be maintained for a long period of time.

A method of manufacturing a prepreg according to a sixth aspect of the present invention is the method of manufacturing a prepreg according to the fifth aspect.
The roll cleaning machine is characterized by a method of brushing the surface of the pressure roll with a rotating brush that is in contact with the pressure roll and then sucking the scattered matter.

A method of manufacturing a prepreg according to a seventh aspect of the present invention is the method of manufacturing a prepreg according to the fifth aspect,
The roll cleaning machine is characterized in that a doctor blade that is in contact with the pressure roll peels off the adhered matter that has adhered to the pressure roll and sucks the separated adhered matter.

The method of manufacturing a prepreg of the invention according to claim 8 is the method of manufacturing a prepreg according to claim 7,
The doctor blade is made of a material having electrical insulation.

A method for producing a prepreg according to a ninth aspect of the present invention is the method for producing a prepreg according to any one of the first to eighth aspects, in which the glass composition is impregnated with the resin composition and heated in a dryer. When obtaining a prepreg obtained by curing a resin composition in a B-stage state, the impregnated product is treated after a step of reducing the amount of the resin composition deposited from the ears of the impregnated product obtained by impregnating the resin composition on a glass substrate. It is characterized by being heated by a dryer.

A method of manufacturing a prepreg according to a tenth aspect of the present invention is the method of manufacturing a prepreg according to any one of the first to ninth aspects, wherein the width of pressing the prepreg by sandwiching the prepreg with a pair of pressure rolls is the width of the prepreg. It is characterized in that it is made narrower, and a position excluding both ends of the prepreg is sandwiched by a pair of pressure rolls to apply pressure.

A method for producing a prepreg according to an eleventh aspect of the present invention is the method for producing a prepreg according to the tenth aspect, wherein at least one of the pair of pressure rolls has a length shorter than a width of the prepreg. The width of pressing the prepreg between the pair of pressure rolls is narrower than the width of the prepreg, and the pressure roll whose length is shorter than the width of the prepreg is chamfered on its outer peripheral surface. Characterize.

According to a twelfth aspect of the present invention, there is provided a method for producing a prepreg according to any one of the first to ninth aspects, wherein both end portions of at least one pressure roll of the pair of pressure rolls are rolled. Is made of an elastic material, and when the prepreg is sandwiched by a pair of pressure rolls, both ends of the roll made of the elastic material reach the position where the ears of the prepreg are sandwiched. It is characterized by making it reach.

According to a thirteenth aspect of the present invention, there is provided a method for producing a prepreg according to any one of the first to ninth aspects, wherein a plurality of pressure rolls are provided in a direction parallel to the width direction of the prepreg. The groups are arranged side by side, and
The roll length of each pressure roll is shorter than the width of the prepreg.

According to a fourteenth aspect of the present invention, there is provided a method for producing a prepreg according to any one of the first to ninth aspects, in which a plurality of pairs of pressure rolls are installed in a traveling direction of the prepreg. Thus, the same position of the prepreg is pressed by the pressing roll a plurality of times.

A method for producing a prepreg according to a fifteenth aspect of the present invention is the method for producing a prepreg according to any one of the first to fourteenth aspects, wherein a pressing portion for pressing the central portion of the pressing roll against the pressing roll. It is characterized by being attached.

According to a sixteenth aspect of the present invention, there is provided a method for producing a prepreg according to the fifteenth aspect, wherein the pressurizing portion for pressing the central portion of the pressurizing roll presses the roll length for pressing. It is an auxiliary roll that is shorter than the roll length of the roll, and is an auxiliary roll that presses the pressure roll at a position where the pressure roll and the prepreg are in contact with each other and a position that is substantially symmetrical with respect to the axis of the pressure roll. Characterize.

A method of manufacturing a prepreg according to a seventeenth aspect of the present invention is the method of manufacturing a prepreg according to any one of the first to fourteenth aspects, wherein one of the pair of pressure rolls is curved and rotates. It is a roll having possible flexibility, and by adjusting the direction of the bearing of the pressure roll, the curved state of the pressure roll can be adjusted, and the pressing state of the prepreg by the pressure roll can be adjusted. Characterize.

A method for producing a prepreg according to an eighteenth aspect of the present invention is the method for producing a prepreg according to any one of the first to fourteenth aspects, wherein the pressure roll has a diameter at the center portion larger than a diameter at the end portions. It is characterized in that it is a pressure roll capable of making the pressing force at its central portion higher than the pressing force at its end portion.

According to a nineteenth aspect of the present invention, in a prepreg smoothing apparatus, a glass base material is impregnated with a resin composition and heated by a drier to sandwich and press a prepreg obtained by curing the resin composition in a B stage state. In a prepreg smoothing device provided with a pressure roll, a cleaner device for removing deposits including resin powder adhered to the prepreg surface generated when the convex portion of the prepreg surface is crushed by the pressure roll. It is characterized by including.

A prepreg smoothing device according to a twentieth aspect of the present invention is the prepreg smoothing device according to the nineteenth aspect, wherein the cleaner device blows air onto the surface of the prepreg from the side opposite to the traveling direction. With the attachment machine,
It is characterized in that it is equipped with a suction device for sucking scattered materials scattered by air. As described above, when the air spraying machine and the suction machine for sucking the scattered matter scattered by the air are provided, the adhered matter can be removed more sufficiently than when only the suction machine is provided. It is possible to obtain a smooth prepreg without damaging the surface of the prepreg.

According to a twenty-first aspect of the invention, there is provided a prepreg smoothing device according to the prepreg smoothing device according to the nineteenth or twentieth aspect, in which the pressure roller presses the central portion of the pressure roller against the pressure roller. It is characterized by being attached.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the invention relating to a method for manufacturing a prepreg and the invention relating to a prepreg smoothing apparatus will be described. Each of the embodiments described below will be described as a method of manufacturing a prepreg, but the prepreg smoothing device used in each of the embodiments shows an embodiment of the invention relating to the prepreg smoothing device. .

First, the first embodiment will be described with reference to FIGS. FIG. 1 is a schematic view showing a prepreg smoothing device, FIG. 2 is a schematic cross-sectional view of a cleaner device, and FIG. 3 is a schematic diagram illustrating the overall arrangement of a prepreg manufacturing device.

Prepreg 1 in the first embodiment
As shown in FIG. 3, the resin composition 12 is added to the glass substrate 1
1 is impregnated with the resin composition 12 and heated in a dryer 14 to prepare a resin composition 12 B
It is cured in a stage state (semi-cured state). As the resin used as the resin composition 12, for example, a resin conventionally used for manufacturing the prepreg 1 such as an epoxy resin, a phenol resin, or a polyimide resin can be used. The resin composition 12 is used by adding a curing agent, a curing accelerator or the like to the resin as needed and diluting with a solvent. As the solvent, for example, methyl ethyl ketone, acetone, dimethylformamide or the like can be used.

As the glass base material 11, a glass fabric or the like conventionally used for manufacturing the prepreg 1 can be used. The glass substrate 11 has a thickness of 0.06 to 0.
A material having a size of about 2 mm can be used.

The method for impregnating the glass substrate 11 with the resin composition 12 is as shown in FIG. 3, in which the resin composition 12 in which a resin or the like is prepared is stored in the impregnation tank 13 and the glass substrate 11 is continuously impregnated. It can be performed by introducing it into the tank 13.
The dryer 14 heats the glass substrate 11 impregnated with the resin composition 12 in order to cure the resin composition 12 into the B-stage state. As a heating method, radiant heat heating is suitable in order to volatilize the solvent in the resin composition 12, but hot air heating, high frequency heating or the like may be used.

Prepreg 1 which has passed through the dryer 14
As a convex portion on the surface thereof, a resin pool due to split ends of the glass base material 11, a resin pool due to bubbles during the impregnation of the resin composition 12, a resin pool generated by volatilization of the solvent during heating, and the like are formed.

As shown in FIG. 3, the prepreg smoothing apparatus 10 for smoothing the surface of the prepreg 1 in the prepreg manufacturing method of the first embodiment has a pair of pressure rolls 2 and 2 and cleaners 3 and 3, as shown in FIG. Equipped with. The prepreg 1 is guided by the roll 15 and advances from the upper side to the lower side of the prepreg smoothing device 10.

Then, as shown in FIG. 1, the prepreg 1 cured in the B stage state is sandwiched and pressed by a pair of pressure rolls 2 and 2. The pressure rolls 2 and 2 crush the convex portions on the surface of the prepreg 1 to make them smooth. The pressure of the prepreg 1 is present on the surface of the prepreg by adjusting the distance between the pressure rolls 2 and 2 (roll clearance) within a range of about the same as the thickness of the prepreg 1 to about half the thickness of the prepreg 1. Apply pressure to the convex part.

As a method of adjusting the distance (roll clearance) between the pressure rolls 2 and 2, for example, the motor 12 is driven to adjust the distance between the pressure rolls 2 and 2 as shown in FIG. Stopper 11 (so-called cotter)
Can be carried out by a method of moving. FIG. 4A is a schematic plan view of the pressure rolls 2 and the vicinity thereof, and FIG.
FIG. 4 is an enlarged view of part A of FIG. Reference numeral 21 in FIG. 4 (a) denotes an air cylinder that functions to move only one pressure roll 2 back and forth, and reference numeral 13 in FIG. 4 (b).
Indicates a speed reducer. In this way, only one pressure roll 2 is movable back and forth by the action of the air cylinder 21, and the other pressure roll 2 has a structure in which the position of its shaft does not move. FIG. 4 showing
Although the method of adjusting the interval (roll clearance) between the pressure rolls 2 and 2 has been described using, the pressure rolls 2 and 2 can be similarly moved even when both pressure rolls 2 and 2 can be moved back and forth. Two intervals can be adjusted.

As for the speed of the pressure rolls 2 and 2 shown in FIG. 1, if the outer peripheral speed of at least one of the pressure rolls 2 is made to be the same as the conveying speed of the prepreg 1, excessive tension is applied to the prepreg 1. Since it is not applied, it is possible to prevent wrinkles and meanders from occurring in the prepreg 1 and to crush the convex portion, so that the pressing force applied to the pressure roll 2 using a desirable air cylinder or the like is In the case of using a pressure roll 2 having a width of 1000 to 2000 mm, 980 to 98000 N (100 to 1000 kgf)
Is appropriate. Prepreg smoothing device 10 shown in FIG.
Then, each pressure roll 2 can reversibly move back and forth by the action of the air cylinder 21 that supports the bearing 22 of the pressure roll 2, and imparts a pressing force to the pressure roll 2. As described above, in FIG. 1, both the pair of pressure rolls 2 and 2 can move the shaft position by the action of the air cylinder 21. As shown in FIG. 4, only one of the pressure rolls 2 is provided with a pressing force by the action of the air cylinder 21, and the other pressure roll 2 has a structure in which its axial position does not move. Rolls 2 and 2 are also possible in the present invention.

Each pressure roll 2 is preferably made of metal, such as a hard chrome-plated iron roll, and the roll surface is coated with a film from which adhered substances such as fluororesin are easily peeled off. What was done is more preferable. The pressing of the prepreg 1 by the pressing rolls 2 and 2 is preferably performed at a surface temperature of 10 to 50 ° C. without particularly heating.

In the prepreg manufacturing method of the first embodiment, next, the prepreg 1 that has passed between the pressure rolls 2 and 2 is introduced into the cleaner step to remove the deposits including the resin powder that are attached to the prepreg surface. To do. The above-mentioned cleaner process is performed by the cleaner devices 3 and 3 on the front and back sides of the prepreg 1.
Are arranged. The cleaner device 3 is provided across the width direction of the prepreg 1. The cleaner device 3 is a non-contact type because the prepreg 1 has a soft surface and is easily scratched.

The cleaner device 3 is equipped with an air spraying machine 4 for spraying air, a suction machine 5 for sucking scattered matter scattered by the air, and an electrostatic eliminating bar 6. As shown in FIG. 2, the cleaner device 3 includes a suction device 5 on the upstream side of the prepreg 1 that advances from the upper side to the lower side. The suction device 5 has a suction chamber 51 facing the prepreg 1 and opened. The suction chamber 51 includes a back wall 52, a ceiling piece 53 extending from above the back wall 52 to the prepreg 1 side, and an upper sloping piece 5 inclined downward at the tip of the ceiling piece 53.
4, a bottom piece 55 extending from below the inner wall 52 to the prepreg 1 side, and a lower inclined piece 56 inclined upward at the tip of the bottom piece 55. In the suction device 5, the gap between the tips of the upper inclined piece 54 and the lower inclined piece 56 serves as the suction port 57. The suction port 57
Are formed in the shape of slits in the width direction in the vicinity of the prepreg 1. The suction pipe 5 is provided with a suction pipe 58 on the back wall 52, and a pump (not shown) connected to the suction pipe 58 is operated to remove scattered matter from the suction port 57 in the vicinity of the prepreg 1. It is sucked into the suction chamber 51 and discharged to the outside of the system through the suction pipe 58.

The cleaner device 3 has a blow-out chamber 41 which is open below the lower inclined piece 56 of the suction device 5 and faces the prepreg 1. The blowout chamber 41 has a lower inclined piece 56.
And a bottom wall 44 extending from the lower end of the inclined wall 43 to the prepreg 1 side, and an inclined wall 43 that is connected to the base end of the lower inclined piece 56 and has its surface 42 directed obliquely upward. The tip of the bottom plate 44 extends to near the surface of the prepreg 1 so that the scattered matter in the blowout chamber 41 does not drop as the prepreg 1 advances. The inclined wall 43 is
It is equipped with an air spraying machine 4 and two static eliminating bars 6.

In the air blower 4, an air passage 7 connected to a blower (not shown) is formed inside the inclined wall 43, and nozzles 8 are attached at a plurality of positions in the air passage 7 at intervals. Has been done. The tip of this nozzle 8 is
The air is blown out in an obliquely upward direction by protruding from 3. The air is blown onto the surface of the prepreg 1 from the side opposite to the advancing direction to scatter the deposits.
The attached matter scattered by the blown air is sucked by the suction device 5 described above. Examples of the attached matter include resin powder and the like that are generated when the convex portion of the prepreg 1 is crushed by the pressure roll 2 and adhere to the surface. The air blowing of the air blowing machine 4 is performed in order to scatter the adhered substances from the surface, and the pressure thereof is, for example, 2
About 90 to 490 kPa (3 to 5 kg / cm ² ) is preferable. The air spraying machine 4 is capable of removing deposits without damaging the surface of the prepreg 1.

The static elimination bar 6 produces an electrostatically charged element or compound in a positive or negative ionic substance,
The static electricity is removed from the prepreg 1 by bringing these ionic substances into contact with the static prepreg 1. Since the adhered matter such as the resin powder adheres to the surface of the prepreg 1 due to static electricity, when the static electricity of the prepreg 1 is removed, the adhered matter is easily removed, and the efficiency of removing the adhered matter is improved. The static electricity removing bar 6 includes an electrode rod 61 provided along the axis of the cylindrical body, a discharge needle 62 protruding from the electrode rod 61 toward the prepreg 1, and a ground 63.

Further, the cleaner device 3 includes a support 9
Supported by. Since the support device 9 can reversibly move the cleaner device 3 back and forth, the cleaner device 3 can be arranged at an optimum distance from the surface of the prepreg 1.

The prepreg manufacturing method of the first embodiment is as follows:
After the convex portion of the prepreg 1 is pressed by the pair of pressure rolls 2 and 2, air is blown onto the surface of the prepreg 1 to scatter adhered substances such as resin powder, and the scattered substances are used as a non-contact cleaner. Since the suction is performed by the device 3, the smooth prepreg 1 can be obtained without damaging the surface.

Some glass base materials such as glass woven fabric, which are raw materials for manufacturing the prepreg 1, have thickened both ends (ears). Using such a glass base material having thick ears, as shown in FIG. 3, the resin composition 12 is impregnated into the glass base material 11 and heated by a dryer 14 to bring the resin composition 12 into a B-stage state. When the cured prepreg 1 is obtained, the thickness of the ears of the obtained prepreg 1 is
Thicker than the central part. As described above, in the case of a prepreg having a thicker ear portion than the central portion, the prepreg 1
Even if the pair of pressure rolls 2 and 2 are used to apply pressure to the protrusions, only the ears may be pressed, and the protrusions of the prepreg 1 may not be sufficiently crushed. Therefore, in the method of manufacturing the prepreg of the first embodiment, the resin composition 12 is impregnated into the glass base material 11 and heated by the dryer 14 to heat the resin composition 12.
When obtaining the prepreg 1 cured to the B stage state,
When the impregnated product is heated in the dryer 14 after the step of reducing the amount of the resin composition 12 attached from the ear of the impregnated product obtained by impregnating the glass substrate 11 with the resin composition 12,
Since it is possible to adjust the thickness of the ears of the prepreg 1 in which the resin composition 12 is cured in the B stage state, even if a glass base material having thick ears is used, the protrusions of the prepreg 1 can be treated with a pair of pressure rolls. It is preferable because it can be sufficiently crushed by applying a pressure of 2 or 2. As a method for reducing the amount of the resin composition 12 attached from the ears of the impregnated product, for example, a method in which the scraping bar is brought into contact with the ears of the impregnated product from both sides immediately after the impregnation of the resin composition 12 is performed. it can.

Next, a second method for producing a prepreg
The embodiment will be described with reference to FIG. FIG. 5 is a schematic view showing a main part of a prepreg manufacturing apparatus. In the method of manufacturing the prepreg of the second embodiment, in addition to the matters described in the method of manufacturing the prepreg of the first embodiment,
The items described below are implemented.

In the prepreg manufacturing method of the second embodiment, a heater 16 is provided after the cleaner device 3 in the prepreg manufacturing method of the first embodiment, as shown in FIG. The prepreg 1 that has passed through is heated to melt only the vicinity of the surface. Prepreg 1
The temperature at which the resin is heated may be appropriately set depending on the type of resin composition, but is 100 when the epoxy resin is used.
~ 120 ° C is preferred. In the manufacturing method according to the second embodiment, the resin powder attached to the surface is melted to prevent the resin powder from scattering.

Further, in the method of manufacturing the prepreg of the second embodiment, as shown in FIG. 5, the pressure roll 2 in the method of manufacturing the prepreg of the first embodiment described above is used.
A roll cleaner 23 is attached to remove deposits adhering to the rolls. The roll cleaner 23 includes a rotary brush 24 that abuts the pressure roll 2 to polish the surface, and a storage chamber 25 that stores the rotary brush 24 and has a roll side opening.
And a second part which is connected to the rear end of the storage chamber 25 and sucks the polishing object.
The suction pipe 26 is provided. The pressure roll 2 may prevent the resin powder from adhering to the pressure roll 2 due to long-term use, but this can be prevented. Therefore, the prepreg manufacturing method of the second embodiment can obtain a smooth prepreg 1 for a long period of time.

Regarding the roll cleaning machine 23 for removing the deposits on the pressure roll 2, as shown in FIG.
It is also possible to adopt a system in which the adhering matter that has adhered to the pressure roll 2 is peeled off by the doctor blade 27 that is in contact with the pressure roll 2 and the separated adhering matter is sucked. In that case, the deposits peeled off by the doctor blade 27 are the second suction pipe 26.
Suck by. In this way, the doctor blade 27
By using, it is possible to keep the surface of the pressure roll 2 in a good state because the adhered substance can be peeled off from the pressure roll 2 even if the adherence substance is strongly adhered to the pressure roll 2. There are advantages. Further, when the material of the doctor blade 27 is made of an electrically insulating material such as fluororesin, the prepreg 1 may be separated from the doctor blade 27 due to abrasion or the like and mixed with the prepreg 1.
Is preferable because it does not extremely lower the electrical insulation property.

Next, a third method for producing a prepreg
The embodiment will be described with reference to FIGS. 7 and 8. Figure 7
FIG. 8 is a schematic plan view showing a pair of pressure rolls 2 provided in the prepreg smoothing device according to the first embodiment already described, and FIG. 8 is a prepreg smoothing device according to the third embodiment. It is a schematic plan view which shows a pair of pressure rolls 2 and 2 with which it is equipped. In the prepreg manufacturing method of the third embodiment, the pair of pressure rolls 2 provided in the prepreg smoothing device in the prepreg manufacturing method of the first embodiment are replaced by those shown in FIG. ,
The one shown in FIG. 8 is used. In the third embodiment, as shown in FIG. 8, the width of pressing the prepreg 1 between the pair of pressure rolls 2 and 2 is narrower than the width of the prepreg 1 and both ends of the prepreg 1 are The position to be removed is sandwiched by a pair of pressure rolls 2 to apply pressure. In this way, when the positions other than both ends of the prepreg 1 are sandwiched and pressed by the pair of pressure rolls 2 and 2, the glass base material having thick ears is used, and the thickness of the ears is thicker than the central portion. Even when the prepreg 1 is used, pressure is not applied to the ears of the prepreg 1 by the pressure rolls 2 and 2. Therefore, the convex portions present on the surface of the prepreg 1 are not compressed by the pair of pressure rolls 2 and 2. There is an advantage that it can be pressed and sufficiently crushed. Further, in the prepreg 1 using the glass woven cloth, when the ears are pressed, warp yarns in the ears of the glass woven cloth may be frayed, but the pressure rolls 2, 2 are applied to the ears. It is effective to prevent the warp of the warp threads of the selvages from being unraveled.

Further, as a modified example of the method for manufacturing a prepreg of the third embodiment, the pair of pressure rolls 2 provided in the prepreg smoothing device has a width smaller than that of the prepreg 1 as shown in FIG. As for the pressure roll 2 having a short length, an example will be described in which the outer peripheral portion of the end face is chamfered (so-called R-processed). When a convex portion existing on the prepreg 1 is pressed by using a roll 2 shorter than the width of the prepreg 1, pressure is likely to be concentrated on the end (edge) of the roll 2 shorter than the width of the prepreg 1. Therefore, an edge mark of the roll 2 may be generated on the prepreg 1 to impair the appearance of the prepreg.
In the modified example of the prepreg manufacturing method of the third embodiment shown in FIG. 9, for the roll 2 shorter than the width of the prepreg 1, the end surface outer peripheral portion is chamfered, so that the roll 2 is used. Roll 2 on prepreg 1
It prevents the generation of edge marks.

In the prepreg manufacturing method of the third embodiment described above, the prepreg manufacturing method is the same as the prepreg manufacturing method of the first embodiment described above except that the pressure rolls 2 are changed. To manufacture.

Next, a fourth method for manufacturing a prepreg
The embodiment will be described with reference to FIG. Figure 10
It is a schematic plan view which shows a pair of pressurization rolls 2 and 2 with which the smoothing apparatus of the prepreg in a 4th embodiment is provided.
In the prepreg manufacturing method of the fourth embodiment, the pair of pressure rolls 2 provided in the prepreg smoothing device 10 in the prepreg manufacturing method of the first embodiment are replaced by those shown in FIG. For this, the one shown in FIG. 10 is used. In the fourth embodiment, as shown in FIG. 10, both end portions 28, 28 of the pair of pressure rolls 2, 2 are formed of elastic material. Examples of this elastic material include rubber and plastic. When the prepreg 1 is sandwiched between the pair of pressure rolls 2, 2, the roll ends 28, 28 made of an elastic material reach the positions where the ears of the prepreg 1 are sandwiched, respectively. I have to. Therefore, according to the fourth embodiment, even if the ear has a thick glass base material and the thickness of the ear becomes the prepreg 1 thicker than the central part, the function of the elastic material causes Since the phenomenon in which the pressure applied by the pair of pressure rolls 2 and 2 is concentrated on the ears is prevented, it is necessary to press the convex portions present on the prepreg 1 with the pair of pressure rolls 2 and 2 to sufficiently crush them. The advantage is that Further, in the fourth embodiment, the roll ends 28, 28 of the one roll 2 of the pair of pressure rolls 2, 2 are made of an elastic material. Both the pressure rolls 2 and 2 may be formed of elastic material at both ends thereof.

In the prepreg manufacturing method of the fourth embodiment described above, the prepreg is manufactured in the same manner as the prepreg manufacturing method of the first embodiment described above, except for changes in the pressure rolls 2 and 2. To manufacture.

Next, a fifth method for manufacturing a prepreg
The embodiment will be described with reference to FIGS. 11, 12, and 13. FIG. 11 is a front view showing the arrangement of the pressure rolls 2 included in the prepreg smoothing device according to the fifth embodiment, and FIG. 12 shows a pressure state by the pair of pressure rolls 2 and 2 in the conventional technique. 13 is a schematic plan view showing FIG.
[Fig. 9] is a schematic plan view showing a pressure state by a pair of pressure rolls 2 provided in a prepreg smoothing device in a fifth embodiment.

In the method of manufacturing the prepreg of the fifth embodiment, the pair of pressure rolls 2 provided in the prepreg smoothing device is conventionally known, as shown in FIG. Instead of the pressure rolls 2 and 2 having a roll length longer than the width, a plurality of sets of pressure rolls 2 and 2 having a roll length shorter than the width of the prepreg 1 as shown in FIG. 13 are used (FIG. 11). reference). Then, as shown in FIG. 11, a plurality of pairs (three pairs in this embodiment) of a pair of pressure rolls 2 and 2 for sandwiching and pressing the prepreg 1 are arranged side by side in a direction parallel to the width direction of the prepreg. Moreover, the roll length of each pressure roll 2 is shorter than the width of the prepreg 1. In the case of the pressure roll 2 whose roll length is longer than the width of the prepreg 1, when the pressure of the air cylinder 21 is applied to the bearing portions 22 located at both ends thereof, as shown by the chain double-dashed line in FIG. Roll 2 because 2 bends
However, in the case of the pressure roll 2 in which the roll length is shorter than the width of the prepreg 1, the pressure of the air cylinder or the like is applied to the bearing portions located at both ends thereof. In this case, as shown in FIG. 13, the pressure roll 2 is less likely to bend than a roll having a long length, so that the pressure in the central portion of the pressure roll 2 is less likely to be insufficient, resulting in a prepreg. 1
The convex portion existing in the
There is an advantage that it can be crushed sufficiently. Also,
As shown in FIG. 11, a pair of pressure rolls 2 and 2 each having a roll length shorter than the width of the prepreg 1 are arranged in a direction parallel to the width direction of the prepreg (3 in this embodiment).
By arranging them in parallel, the convex portions can be pressed against the width of the prepreg that needs to be smoothed and smoothed.

In the prepreg manufacturing method of the fifth embodiment described above, the prepreg manufacturing method is the same as the prepreg manufacturing method of the first embodiment described above, except for changes in the pressure rolls 2 and 2. To manufacture.

Next, a sixth method for producing a prepreg
The embodiment will be described with reference to FIG. FIG. 14 is a front view showing an arrangement of the pressure rolls 2 included in the prepreg smoothing device according to the sixth embodiment. In the prepreg manufacturing method of the sixth embodiment, in place of the pair of pressure rolls 2 provided in the prepreg smoothing device in the method of manufacturing the prepreg of the first embodiment, a pair of pressure rolls is used. A plurality of sets of 2 and 2 (3 sets in this embodiment) are used. Then, in the sixth embodiment, as shown in FIG. 14, three sets of pressure rolls 2 for sandwiching and pressing the prepreg are installed in the advancing direction of the prepreg so that the same position of the prepreg is covered by the pressure roll 2. I try to pressurize three times. Therefore, according to the sixth embodiment,
Pressing the convex portion present on the prepreg 1 three times,
Since it can be crushed, there is an advantage that a smoother prepreg can be obtained.

Then, in the prepreg manufacturing method of the sixth embodiment described above, the prepreg is manufactured in the same manner as the prepreg manufacturing method of the first embodiment described above, except for the change regarding the pressure roll 2. To do.

Next, a seventh method for manufacturing a prepreg
The embodiment will be described with reference to FIG. FIG. 15 is a schematic plan view showing a pressure roll included in the prepreg smoothing device according to the seventh embodiment. In the method of manufacturing the prepreg of the seventh embodiment, the pair of pressure rolls 2,
A prepreg smoothing device is used in which one of the two pressure rolls 2 is provided with a pressure portion 81 that presses the central portion of the pressure roll 2. Further, in the seventh embodiment, as shown in FIG. 15, the pressing portion 81 that presses the central portion of the pressing roll 2 is formed by the auxiliary roll 82 made of a rubber roll. The auxiliary roll 82 has a roll length shorter than the pressure roll 2 to press,
Moreover, the pressure roll 2 is pressed at a position where the pressure roll 2 and the prepreg 1 are in contact with each other and a position substantially symmetrical with respect to the axis of the pressure roll 2. And the auxiliary roll 82
The force for pushing the pressure roll 2 is given by the air cylinder 84 that supports the bearing 83 of the auxiliary roll 82. As described above, in the seventh embodiment, the air cylinders 2 are attached to the bearing portions 22 located at both ends of the pressure roll 2.
When the force of 1 is applied, the pressure roll 2 bends,
Even if the pressure in the central part of the pressure roll 2 is insufficient, the pressure part 81 for pressing the central part of the pressure roll 2 is additionally provided, so that the pressure shortage in the central part of the pressure roll 2 is eliminated. Therefore, there is an advantage that a smooth prepreg can be obtained more reliably.

In the prepreg manufacturing method of the seventh embodiment described above, the prepreg of the first embodiment described above is provided except that the pressure roller 81 is provided with the pressure portion 81. A prepreg is manufactured in the same manner as the manufacturing method.

Next, an eighth method for manufacturing a prepreg
The embodiment will be described with reference to FIG. FIG. 16 is a schematic plan view showing the pressure rolls 2 provided in the prepreg smoothing device according to the eighth embodiment. In the method of manufacturing the prepreg of the eighth embodiment, one of the pair of pressure rolls 2 and 2 is a flexible roll that is curved and rotatable. The bending state of the pressure roll 2 is adjusted by adjusting the direction of the bearing portion 22, and the pressing state of the prepreg 1 by the pressure roll 2 can be adjusted. Therefore, since the pressure at the center of the pressure roll 2 can be adjusted, there is an advantage that a smooth prepreg can be obtained more reliably.

Then, in the prepreg manufacturing method of the eighth embodiment described above, a prepreg is manufactured in the same manner as the prepreg manufacturing method of the first embodiment described above except for the point relating to the pressure roll 2. To do.

Next, a ninth method for manufacturing a prepreg
The embodiment will be described with reference to FIG. FIG. 17 is a schematic plan view showing the pressure rolls 2 provided in the prepreg smoothing device according to the ninth embodiment. In the method of manufacturing the prepreg of the ninth embodiment, the diameter of the central portion of each of the pair of pressure rolls 2 and 2 is set to be larger than the diameter of the end portion, and A pressure roll 2 is used that can make the pressing force higher than the pressing force at its end. As described above, in the ninth embodiment, when pressures such as air cylinders are applied to the bearing portions located at both ends of the pressure roll 2, the pressure roll 2 bends and the central portion of the pressure roll 2 is deformed. Even if the pressure is insufficient, since the pressure roll 2 that can make the pressing force at the central portion higher than the pressing force at the end portion is used, the insufficient pressure at the central portion of the pressure roll 2 can be eliminated, There is an advantage that a smooth prepreg can be obtained more reliably. It is also possible to make the diameter of the central portion of both the pair of pressure rolls 2, 2 larger than the diameter of the end portions.

In the prepreg manufacturing method of the ninth embodiment described above, the prepreg is manufactured in the same manner as the prepreg manufacturing method of the first embodiment described above except for the point relating to the pressure roll 2. To do.

[0066]

The present invention will be further described with reference to specific examples.

Example 1 A glass substrate was impregnated with a resin composition using the apparatus shown in FIGS. 1 to 3 to prepare a smooth prepreg. As the glass substrate, a glass woven fabric (Nitto Boseki Co., Ltd .: WEA-15) having a thickness of 0.15 mm was used. The resin composition is a mixture of 100 parts by mass of an epoxy resin, 3 parts by mass of dicyandiamide, 0.2 part by mass of 2-ethyl-4-methylimidazole, and 10 parts by mass of DMF (N, N-dimethylformamide). And further diluted with DMF to adjust the specific gravity to 1.15. The resin composition was stored in the impregnation tank, and the glass substrate was continuously introduced into the impregnation tank so that the content of the resin composition was 345 g / m ² . Then, the resin composition was cured in a B stage state by a radiant heat heating dryer.

The prepreg was sandwiched and pressed by a pair of pressure rolls. As the pressure roll, a roll with a width of 1500 mm plated with hard chrome is used, and the roll gap is set to 0.1.
It was adjusted to 5 mm so that the pushing force was 3920 N (400 kgf). The surface temperature of the pressure roll was 30 ° C., the prepreg conveyance speed was 15 m / min, and the peripheral speeds of the pair of pressure rolls were both set to be the same as the prepreg conveyance speed.

Next, the prepreg was introduced into the cleaner step to remove the deposits including the resin powder deposited on the surface of the prepreg. The cleaner device 3 in the cleaner step has an air blowing pressure of 392 kPa (4 kg / cm ² ), a suction amount of 25 m ³ / min per minute, and a static pressure of the suction port of 4.
It was set to be 4 kPa. Also, a static eliminating bar was used.

The appearance of the obtained prepreg was observed for a size of 1 m × 1 m, and the existing projections were inspected for any projections having a height of 50 μm or more using a surface roughness meter. According to this inspection result, there was no protrusion having a height of 50 μm or more, and the obtained prepreg was smooth. Furthermore, the prepreg was cut into 1 m × 1 m, five sheets were stacked, and a copper foil having a thickness of 18 μm was arranged on both sides of the prepreg, and pressure heating was performed to form a copper clad laminate. When 100 sheets of the copper foil surface of the copper clad laminate were inspected, no wrinkles or other irregularities were found.

Example 2 A glass substrate was impregnated with a resin composition using the apparatus shown in FIG. 5 to prepare a smooth prepreg. In Example 1, the surface temperature of the pressure roll is 10
Except the glass substrate, the resin composition, the impregnation conditions,
The drying conditions, the pressure roll used, the conditions of the cleaner step, etc. were the same.

After the cleaner step, the prepreg was heated to a temperature of 11
The resin powder adhering to the surface was melted by passing through the heater 16 at 0 ° C. for 10 seconds.

The appearance of the obtained prepreg was observed and inspected in the same manner as in Example 1. As a result, there was no protrusion having a height of 50 μm or more, and the obtained prepreg was smooth. Furthermore, when a copper clad laminate was formed in the same manner as in Example 1 and 100 copper foil surfaces of the copper clad laminate were inspected, no wrinkles or other irregularities were found.

Example 3 In Example 1, except that the surface temperature of the pressure roll was 10 ° C., the glass substrate, the resin composition, the impregnation condition, the drying condition, the pressure roll used, and the cleaner step were used. The conditions were exactly the same.

The appearance of the obtained prepreg was observed and inspected in the same manner as in Example 1. As a result, there was no convex portion having a height of 50 μm or more, and the obtained prepreg was smooth. Further, when a copper clad laminate was formed in the same manner as in Example 1 and 100 copper foil surfaces of the copper clad laminate were inspected, one unevenness such as wrinkles was found.

(Comparative Example 1) In Example 1, a prepreg was produced without using the cleaner step. The glass substrate, the resin composition, the impregnation conditions, the drying conditions and the pressure roll conditions were exactly the same as in Example 1. The appearance of the obtained prepreg was observed and inspected in the same manner as in Example 1, and as a result, it was found to be smooth without any protrusion having a height of 50 μm or more.
However, the resin powder was attached to the prepreg. further,
When a copper clad laminate was molded in the same manner as in Example 1 and 100 copper foil surfaces of the copper clad laminate were inspected, irregularities such as wrinkles were 1
It occurred at 0 places.

[0077]

According to the prepreg manufacturing method of the present invention as set forth in claims 1 to 17, the projections on the surface of the prepreg are crushed and smoothed by a pair of pressure rolls, and then the prepreg is introduced into a cleaner step. Since the adhering material including the resin powder adhering to the surface of the prepreg is removed, the surface of the prepreg can be smoothed without introducing the adhering material such as the resin powder into the subsequent process.

In the prepreg manufacturing method according to the second aspect of the present invention, in the cleaner step, air is blown onto the surface of the prepreg from the side opposite to the advancing direction to scatter the deposits.
Since there is a non-contact type cleaner device that sucks in this scattered material, air is blown to scatter the deposited material,
By sucking this scattered matter with a non-contact type cleaner device, it is possible to more sufficiently remove the attached matter than with simple suction and to obtain a smooth prepreg without damaging the surface of the prepreg. it can.

In the prepreg manufacturing method according to the third aspect of the present invention, the use of the electrostatic removing bar makes it easier for the deposits to be removed from the surface of the prepreg, so that the deposit removal efficiency can be improved. .

In the prepreg manufacturing method of the invention according to claim 4, the prepreg that has passed through the cleaner step is heated to melt only the vicinity of the surface, thereby melting the resin powder adhering to the surface and scattering the resin powder. Can be prevented.

In the prepreg manufacturing method of the invention according to claims 5 to 8, since the pressure roll is provided with a roll cleaner for removing the deposits adhering to the pressure roll, the pressure roll Since the resin powder is prevented from adhering to the surface, the smoothness of the surface of the pressure roll can be maintained for a long period of time.

In the method for producing a prepreg of the invention according to claim 9, the impregnated material is impregnated with the resin composition after impregnating the impregnated material with the resin composition impregnated into the glass substrate. Since it is heated in a dryer, the thickness of the ears of the prepreg obtained by curing the resin composition in the B stage state can be adjusted. The portion can be sufficiently crushed by applying pressure with a pair of pressure rolls.

In the prepreg manufacturing method according to the tenth and eleventh aspects of the present invention, since the width for sandwiching and pressing the prepreg with the pair of pressure rolls is made narrower than the width of the prepreg, the glass base having thick ears is formed. Using the material, the thickness of the ear,
Even if the prepreg is thicker than the central portion, the ridges on the surface of the prepreg 1 are pressed by the pair of pressure rolls without applying pressure to the ears of the prepreg 1 by the pressure rolls. It can be crushed.

In the prepreg manufacturing method of the invention according to claim 12, both ends of the roll of at least one of the pair of pressure rolls are made of an elastic material, and the pair of pressure rolls are formed. When sandwiching the prepreg, until the position where the ears of the prepreg are sandwiched, both ends of the roll formed of elastic material are made to reach each other, so using a glass base material with thick ears, Even if the thickness of the ears is thicker than that of the central part, the presence of prepreg exists because the elastic material prevents the pressure from the pair of pressure rolls from concentrating on the ears. Press the convex portion with a pair of pressure rolls,
Can be crushed.

According to the prepreg manufacturing method of the present invention according to claim 13, claim 15 and claim 16, since it is possible to prevent the pressure in the central portion of the pressure roll from becoming insufficient, the pressure in the central portion of the pressure roll can be prevented. The degree of insufficient pressure is reduced, and the convex portions present on the prepreg can be pressed by the pair of pressure rolls to be sufficiently crushed.

In the prepreg manufacturing method according to the fourteenth aspect of the present invention, a plurality of pairs of pressure rolls are installed in the advancing direction of the prepreg so that the same position of the prepreg is pressurized multiple times by the pressure rolls. Therefore, the convex portions present in the prepreg can be sufficiently crushed.

According to the prepreg manufacturing method of the invention of claim 17 and claim 18, a smooth prepreg can be obtained more reliably.

According to the prepreg smoothing apparatus of the inventions of claims 19 to 21, a smooth prepreg is manufactured without bringing in an adhering material such as resin powder to a subsequent step and without damaging the surface. can do.

According to the prepreg smoothing device of the invention of claim 20, in addition to the effect of the prepreg smoothing device of the inventions of claims 19 to 21, it is more sufficient than simple suction. In addition, it is possible to remove the attached matter.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of a manufacturing apparatus showing a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of the above-mentioned cleaner device.

FIG. 3 is a schematic view illustrating an arrangement of the entire manufacturing apparatus of the above.

4A and 4B are schematic views of a main part for explaining a gap adjustment between the pressure rollers 2 and 2 in the first embodiment of the present invention, FIG. 4A is a plan view, and FIG. FIG.

FIG. 5 is a schematic view of a main part of a manufacturing apparatus showing a second embodiment of the present invention.

FIG. 6 is a schematic sectional view of an essential part for explaining a modified example of the second embodiment of the present invention.

FIG. 7 is a schematic plan view of a main part of the manufacturing apparatus according to the first embodiment of the present invention.

FIG. 8 is a schematic plan view of an essential part for explaining a third embodiment of the present invention.

FIG. 9 is a schematic plan view of a main part for explaining a modified example of the third embodiment of the present invention.

FIG. 10 is a schematic plan view of an essential part for explaining a fourth embodiment of the present invention.

FIG. 11 is a schematic front view of a main part for explaining a fifth embodiment of the present invention.

FIG. 12 is a schematic plan view of a main part for explaining a pressure roll according to a conventional technique.

FIG. 13 is a schematic plan view of relevant parts for explaining a pressure roll according to a fifth embodiment of the present invention.

FIG. 14 is a schematic front view of a main part for explaining a sixth embodiment of the present invention.

FIG. 15 is a schematic plan view of an essential part for explaining a seventh embodiment of the present invention.

FIG. 16 is a schematic plan view of an essential part for explaining an eighth embodiment of the present invention.

FIG. 17 is a schematic plan view of an essential part for explaining a ninth embodiment of the present invention.

[Explanation of symbols]

1 prepreg 2 pressure roll 3 cleaner device 4 Air spraying machine 5 suction machine 6 Electrostatic removal bar 10 Prepreg smoothing device 11 glass substrate 12 Resin composition 14 dryer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koji Kusada             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F-term (reference) 4F072 AA07 AB09 AB28 AG03 AH21                       AJ04 AJ26 AJ40                 4F205 AA36 AB11 AD04 AD16 AF16                       AG01 AM11 AM12 HA08 HA29                       HA35 HA45 HC16 HG04 HK25

Claims (21)

[Claims] 1. A method for producing a prepreg in which a glass base material is impregnated with a resin composition, and the prepreg obtained by heating the resin composition in a B stage state by heating with a drier is sandwiched between a pair of pressure rolls to apply pressure. It is characterized in that the convex portions on the surface of the prepreg are crushed and smoothed by the pair of pressure rolls, and then this prepreg is introduced into a cleaner step to remove deposits including resin powder adhering to the surface of the prepreg. And a method of manufacturing a prepreg. 2. A non-contact type cleaner device for spraying air from the side opposite to the advancing direction to scatter adhering substances on the surface of the prepreg and sucking the scatterable substances is arranged in the cleaning step. The method for producing a prepreg according to claim 1, wherein: 3. The electrostatic cleaning bar is additionally provided in the cleaning step.
A method for producing the described prepreg. 4. The method for producing a prepreg according to claim 1, wherein the prepreg that has passed through the cleaning step is heated to melt only the vicinity of the surface. 5. The method of manufacturing a prepreg according to claim 1, wherein the pressure roll is provided with a roll cleaner for removing deposits attached to the pressure roll. . 6. The method of manufacturing a prepreg according to claim 5, wherein the roll cleaning machine is of a system in which the surface of the pressure roll is brushed with a rotating brush that is in contact with the pressure roll and then the scattered matter is sucked. . 7. The roll cleaning machine is of a type in which a doctor blade that abuts against the pressure roll separates the adhered matter adhered to the pressure roll and sucks the separated adhered matter. 5. The method for producing a prepreg according to item 5. 8. The method of manufacturing a prepreg according to claim 7, wherein the doctor blade is made of a material having electrical insulation properties. 9. An impregnated product obtained by impregnating a glass substrate with a resin composition when a glass substrate is impregnated with the resin composition and heated in a drier to obtain a prepreg in which the resin composition is cured in a B-stage state. The prepreg according to any one of claims 1 to 8, wherein the impregnated product is heated by a drier after a step of reducing the amount of the resin composition attached from the ears of the prepreg. Method. 10. A width for pressing the prepreg by a pair of pressure rolls is narrower than a width of the prepreg, and a position excluding both ends of the prepreg is sandwiched and pressed by the pair of pressure rolls. The method for manufacturing a prepreg according to any one of claims 1 to 9, characterized in that. 11. The length of at least one roll of the pair of pressure rolls is made shorter than the width of the prepreg so that the width for sandwiching and pressing the prepreg by the pair of pressure rolls is narrower than the width of the prepreg. 11. The method of manufacturing a prepreg according to claim 10, wherein the pressure roll having a length shorter than the width of the prepreg is chamfered at the outer peripheral portion of the end surface. 12. At least one pressure roll of the pair of pressure rolls, wherein both ends of the roll are formed of elastic material, and when the prepreg is sandwiched by the pair of pressure rolls, 10. The method for producing a prepreg according to claim 1, wherein both ends of the roll made of an elastic material reach the positions where the ears are sandwiched. 13. A plurality of pairs of pressure rolls are arranged side by side in a direction parallel to the width direction of the prepreg, and the roll length of each pressure roll is shorter than the width of the prepreg. The method for producing a prepreg according to any one of claims 1 to 9, which is characterized in that. 14. A pair of pressure rolls are installed in a plurality of sets in the advancing direction of the prepreg so that the same position of the prepreg is pressurized multiple times by the pressure roll. The method for manufacturing a prepreg according to claim 9. 15. The method of manufacturing a prepreg according to claim 1, wherein the pressure roll is provided with a pressure portion for pressing the central portion of the pressure roll. 16. A location where the pressure portion for pressing the central portion of the pressure roll is an auxiliary roll whose roll length is shorter than the roll length of the pressure roll to be pressed, and where the pressure roll and the prepreg contact each other. 16. The method for producing a prepreg according to claim 15, wherein the auxiliary roll presses the pressure roll at a position substantially symmetrical with respect to the axis of the pressure roll. 17. The pressure roll of one of the pair of pressure rolls is a flexible roll that is curved and rotatable.
15. The bending state of the pressure roll is adjusted by adjusting the direction of the bearing portion of the pressure roll so that the pressing state of the prepreg by the pressure roll can be adjusted. Or a method for producing a prepreg as described above. 18. The pressure roll is a roll having a diameter of a central portion larger than a diameter of an end portion thereof, and the pressing force of the central portion can be made higher than the pressing force of the end portion. The method for producing a prepreg according to any one of claims 1 to 14, characterized in that it is present. 19. A prepreg smoothing device comprising a pair of pressure rolls for impregnating a prepreg obtained by impregnating a glass substrate with a resin composition and heating the resin composition in a B-stage state by heating with a drier. In the above, the prepreg smoothing device is provided with a cleaner device that removes deposits including resin powder that adhere to the prepreg surface when crushing the protrusions on the prepreg surface with the pressure roll. . 20. The cleaner device comprises an air spraying machine for spraying air onto the surface of the prepreg from the side opposite to the traveling direction, and a suction machine for sucking the scattered matter scattered by the air. 20. The prepreg smoothing device according to claim 19. 21. The prepreg smoothing device according to claim 19 or 20, wherein the pressure roll is provided with a pressure portion for pressing the central portion of the pressure roll.