JP2010247514A - Prepreg manufacturing apparatus and manufacturing method - Google Patents

Abstract

A prepreg manufacturing apparatus capable of reducing warpage while manufacturing a prepreg is provided.
The present invention relates to a prepreg manufacturing apparatus for manufacturing a prepreg by impregnating a resin varnish 1 while transporting a long base material 3 and drying a resin-impregnated base material 4. A thickness adjusting means 12 for adjusting the thickness of the resin-impregnated substrate 4 by decreasing the amount of resin on one side of the resin-impregnated substrate 4 before drying and increasing the amount of resin on the other side; A dryer 7 that dries the transported resin-impregnated base material 4 while being transported, and a warp detector 8 that detects the presence / absence and orientation of the dried resin-impregnated base material 4 are provided. When warping is detected in the resin-impregnated base material 4 after drying, the resin amount on the concave surface formed by warping of the resin-impregnated base material 4 before drying is reduced by the thickness adjusting means 12, and the resin before drying is reduced. The resin amount on the convex surface side formed by warping of the impregnated substrate 4 is increased by the thickness adjusting means 12.
[Selection] Figure 1

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for a prepreg used as a material for a printed wiring board.

  A prepreg used as a printed wiring board material is manufactured by impregnating a resin varnish into a base material and then drying the resin-impregnated base material. Conventionally, in a prepreg having a thickness of 0.1 mm or more, Since the number of fibers constituting the material is large, the strength is high, and the weight is heavy, the phenomenon of warpage is less likely to be a problem.

  However, in recent years, there has been an increasing need for miniaturization and thinning, and thin substrates having low strength and light weight are used to meet this need. When a very thin prepreg having a thickness of less than 0.1 mm is manufactured, even if the thicknesses of the resin layers on the front and back of the base material are slightly different, the phenomenon of warping comes to the surface due to shrinkage after drying. I came.

  In order to reduce such prepreg warpage, it is necessary to form a resin layer with a uniform thickness on the front and back of the substrate, but the amount and viscosity of the resin varnish adhering to the substrate during impregnation are the same on the front and back. Therefore, even if the resin-impregnated base material is passed through the center between the pair of squeeze rolls, the thickness of the resin layers on the front and back sides is not necessarily uniform. It is necessary to adjust each time where the resin-impregnated base material is passed.

  And although the impregnation conditions are also changed after cutting out a part of the prepreg and measuring its warpage (see, for example, Patent Document 1), while the warp is being measured, the prepreg is manufactured. Must be temporarily suspended.

  Further, although a method for reducing the warpage without interrupting the production of the prepreg is also provided (see, for example, Patent Document 2), in this method, the resin on the front and back of the substrate is scraped to measure the warpage of the prepreg. However, since the presence or absence of warping can be confirmed only after scraping off the resin, if the resin is scraped off without warping, only the scraped portion of the prepreg is wasted. It is.

JP 2005-336319 A JP 2005-307080 A

  This invention is made | formed in view of said point, and it aims at providing the manufacturing apparatus and manufacturing method of a prepreg which can reduce the curvature while manufacturing a prepreg.

  The prepreg manufacturing apparatus according to claim 1 of the present invention impregnates the base material 3 with the resin varnish 1 while transporting the long base material 3 in the longitudinal direction, and transports the resin-impregnated base material 4. In the prepreg manufacturing apparatus for manufacturing a prepreg by drying, the resin amount on one surface side of the resin-impregnated base material 4 before drying is decreased, and the resin amount on the other surface side is increased by increasing the resin amount on the other surface side. Thickness adjusting means 12 for adjusting the thickness of the resin-impregnated base material 4, a dryer 7 for drying the resin-impregnated base material 4 whose thickness is adjusted by the thickness adjusting means 12, and drying by the dryer 7. When the warpage of the resin-impregnated base material 4 after drying is detected by the warpage detector 8, the warpage detector 8 detects the presence or absence and the direction of the warpage of the resin-impregnated base material 4. Dry The amount of resin on the concave surface formed by warping of the previous resin-impregnated base material 4 is reduced by the thickness adjusting means 12, and the amount of resin on the convex surface side formed by warping of the resin-impregnated base material 4 before drying is reduced to the thickness. It is increased by the adjusting means 12.

  According to a second aspect of the present invention, in the first aspect, the thickness adjusting means 12 is provided in the dip tank 2 storing the resin varnish 1 and in the dip tank 2, and is conveyed into the dip tank 2. After the long base 3 is impregnated with the resin varnish 1, the resin impregnated base 4 is turned back to transport the resin-impregnated base 4 to the outside of the dip tank 2, and is conveyed from the inside of the dip tank 2. And a pair of squeeze rolls 6 that adjust the thickness of the dip squeeze rolls 6 through the resin-impregnated base material 4, and both or one of the dip rolls 5 and the pair of squeeze rolls 6 are movably provided, When the warp detector 8 detects warping of the resin-impregnated base material 4 after drying, the concave surface formed by the warpage of the resin-impregnated base material 4 before drying is opposed to the concave surface. Move the dip roll 5 as lapping to Izuroru 6, or is characterized in that gather by moving the squeeze roll 6 to the concave surface.

  According to a third aspect of the present invention, in the first aspect, the thickness adjusting means 12 is formed by a pair of roll coaters 13, and the warpage of the resin-impregnated base material 4 after drying is detected by the warpage detector 8. In this case, the amount of resin on the concave surface formed by warping of the resin-impregnated base material 4 before drying is reduced by one roll coater 13a (or 13b), and formed by warping of the resin-impregnated base material 4 before drying. The amount of the resin on the convex surface side is increased by the other roll coater 13b (or 13a).

  According to a fourth aspect of the present invention, in the first aspect, the thickness adjusting means 12 is formed by a pair of gravure coaters 14, and the warp detector 8 detects warpage of the resin-impregnated base material 4 after drying. In this case, the resin amount on the concave surface formed by warping of the resin-impregnated base material 4 before drying is reduced by one gravure coater 14a (or 14b), and formed by warping of the resin-impregnated base material 4 before drying. The amount of the resin on the convex surface side is increased by the other gravure coater 14b (or 14a).

  The invention according to claim 5 is the invention according to claim 1, wherein the thickness adjusting means 12 is formed of a pair of die coaters, and the warpage of the resin-impregnated base material 4 after drying is detected by the warpage detector 8. In this case, the resin on the concave surface formed by warping of the resin-impregnated base material 4 before drying is reduced by one die coater, and the resin on the convex surface side formed by warping of the resin-impregnated base material 4 before drying. The amount is increased by the other die coater.

  The invention according to claim 6 is the distance from the resin-impregnated base material 4 at a position facing the one surface of the resin-impregnated base material 4 in any one of the first to fifth aspects. A plurality of distance sensors 9 capable of measuring the above are formed in parallel in the width direction of the resin-impregnated base material 4.

  According to a seventh aspect of the present invention, in the sixth aspect, the warp detector 8 is formed by providing at least one distance sensor 9 at a position facing the other surface of the resin-impregnated base material 4. It is characterized by.

  According to an eighth aspect of the present invention, in the seventh aspect, the warpage detector 8 places the distance sensor 9 in a width direction of the resin-impregnated base material 4 at a position facing the other surface of the resin-impregnated base material 4. It is characterized by being formed in parallel.

  In the prepreg manufacturing method according to claim 9 of the present invention, the resin varnish 1 is stored in the dip tank 2 and conveyed to the inside of the dip tank 2 by the dip roll 5 provided in the dip tank 2. After the long base 3 is impregnated with the resin varnish 1, the resin-impregnated base 4 is conveyed to the outside of the dip tank 2, and the resin-impregnated base 4 is passed between a pair of squeeze rolls 6. In the prepreg manufacturing method in which the resin-impregnated base material 4 is dried while being transported after the thickness is adjusted, if warpage is detected in the resin-impregnated base material 4 after drying, The dip roll 5 is moved so that the concave surface formed by the warp of the resin-impregnated base material 4 is brought close to the squeeze roll 6 opposed to the concave surface, or the squeeze roll 6 is moved to the concave surface and moved. And it is characterized in Rukoto.

  In the method for producing a prepreg according to claim 10 of the present invention, the base material 3 is impregnated with the resin varnish 1 by a pair of roll coaters 13 while the long base material 3 is conveyed in the longitudinal direction. In the prepreg manufacturing method in which the prepreg is manufactured by drying the material 4 while being conveyed, if warpage is detected in the resin-impregnated substrate 4 after drying, the resin-impregnated substrate 4 before drying The amount of resin on the concave side formed by warping is reduced by one roll coater, and the amount of resin on the convex side formed by warping of the resin-impregnated substrate 4 before drying is increased by the other roll coater. To do.

  In the prepreg manufacturing method according to claim 11 of the present invention, the resin varnish 1 is impregnated into the substrate 3 by a pair of gravure coaters 14 while the long substrate 3 is conveyed in the longitudinal direction. In the prepreg manufacturing method in which the prepreg is manufactured by drying the material 4 while being conveyed, if warpage is detected in the resin-impregnated substrate 4 after drying, the resin-impregnated substrate 4 before drying The amount of resin on the concave surface formed by warping is reduced by one gravure coater 14, and the amount of resin on the convex surface formed by warping of the resin-impregnated substrate 4 before drying is increased by the other gravure coater 14. It is a feature.

  In the prepreg manufacturing method according to claim 12 of the present invention, the resin varnish 1 is impregnated into the base material 3 by a pair of die coaters while the long base material 3 is conveyed in the longitudinal direction. In the prepreg manufacturing method in which the prepreg is manufactured by drying while transporting 4, when warpage is detected in the resin-impregnated base material 4 after drying, the warpage of the resin-impregnated base material 4 before drying is detected. The amount of the resin on the concave surface formed by the above-described method is reduced by one die coater, and the amount of the resin on the convex surface formed by the warp of the resin-impregnated base material 4 before drying is increased by the other die coater. Is.

  According to the prepreg manufacturing apparatus of the present invention, the amount of resin on both sides of the resin-impregnated substrate before drying is increased / decreased by the thickness adjusting means depending on the presence / absence and orientation of the resin-impregnated substrate immediately after drying. By performing the feedback control, the warpage can be reduced while manufacturing the prepreg.

  According to the invention according to claim 2, by performing feedback control of moving the dip roll or the squeeze roll according to the presence / absence and direction of warping of the resin-impregnated substrate immediately after drying, the warp is produced while producing the prepreg. It can be reduced.

  According to the invention of claim 3, feedback control is performed to increase or decrease the amount of resin on both sides of the resin-impregnated substrate before drying by a pair of roll coaters according to the presence / absence and orientation of the resin-impregnated substrate immediately after drying. By doing so, the warp can be reduced while producing the prepreg.

  According to the invention which concerns on Claim 4, the feedback control of increasing / decreasing the resin amount of the both sides of the resin impregnation base material before drying with a pair of gravure coater according to the presence or absence and direction of the curvature of the resin impregnation base material immediately after drying. By doing so, the warp can be reduced while producing the prepreg.

  According to the invention according to claim 5, the feedback control of increasing / decreasing the amount of resin on both sides of the resin-impregnated base material before drying by a pair of die coaters according to the presence / absence and orientation of the resin-impregnated base material immediately after drying. By doing so, the warp can be reduced while producing the prepreg.

  According to the invention of claim 6, it is possible to detect the presence or absence of warpage of the resin-impregnated base material from the distance from the resin-impregnated base material measured by each distance sensor. The direction and degree can also be detected.

  According to the invention of claim 7, the distance sensor provided at a position facing one surface of the resin-impregnated base material and the distance sensor provided at a position facing the other surface of the resin-impregnated base material are opposed to each other. In other words, the thickness and variation of the resin-impregnated base material can be measured.

  According to the eighth aspect of the present invention, the distance sensor provided at a position facing one surface of the resin-impregnated base material is opposed to the distance sensor provided at a position facing the other surface of the resin-impregnated base material. In other words, the thickness and variation of the resin-impregnated base material can be measured.

  According to the method for producing a prepreg according to claim 9 of the present invention, the prepreg is controlled by performing feedback control of moving the dip roll or the squeeze roll according to the presence / absence and orientation of the resin-impregnated base material immediately after drying. The warpage can be reduced while manufacturing.

  According to the method for producing a prepreg according to claim 10 of the present invention, the amount of resin on both sides of the resin-impregnated substrate before drying is determined by a pair of roll coaters in accordance with the presence or absence and orientation of the resin-impregnated substrate immediately after drying. By performing feedback control to increase / decrease, the warp can be reduced while manufacturing the prepreg.

  According to the prepreg manufacturing method according to claim 11 of the present invention, the amount of resin on both sides of the resin-impregnated substrate before drying is determined by a pair of gravure coaters according to the presence or absence and orientation of the resin-impregnated substrate immediately after drying. By performing feedback control to increase / decrease, the warp can be reduced while manufacturing the prepreg.

  According to the method for producing a prepreg according to claim 12 of the present invention, the resin amount on both sides of the resin-impregnated substrate before drying is determined by a pair of die coaters according to the presence / absence and orientation of the resin-impregnated substrate immediately after drying. By performing feedback control to increase / decrease, the warp can be reduced while manufacturing the prepreg.

It is a schematic sectional drawing which shows an example of the manufacturing apparatus of the prepreg which concerns on this invention. (A)-(c) is a perspective view which shows another curvature detector and prepreg, respectively. FIG. 3 shows a state of detecting prepreg warpage using the warp detector shown in FIG. 2 (a), and (a) to (c) are schematic front views. FIG. 3 is a schematic front view of a state in which the warp of the prepreg is detected using the warp detector shown in FIG. 2 (b). FIG. 3 is a schematic front view of a state in which the warp of the prepreg is detected using the warp detector shown in FIG. 2 (c). It is a schematic sectional drawing which shows another example of the manufacturing apparatus of the prepreg which concerns on this invention. It is a schematic sectional drawing which shows another example of the manufacturing apparatus of the prepreg which concerns on this invention.

  Embodiments of the present invention will be described below.

(Embodiment 1)
FIG. 1 shows an example of an apparatus for producing a prepreg according to the present invention, which impregnates a base material 3 with a resin varnish 1 while conveying the long base material 3 in the longitudinal direction, and this resin impregnation. A prepreg is produced by drying the substrate 4 while being conveyed. Specifically, the dip tank 2, the dip roll 5, and a pair of squeeze rolls 6 (6a, 6b) are dried. The machine 7 and the warp detector 8 are provided. In particular, the dip tank 2, the dip roll 5, and the pair of squeeze rolls 6 are provided to form the thickness adjusting means 12.

  The dip tank 2 has an open top surface and stores the resin varnish 1 therein. The resin varnish 1 is not particularly limited. For example, the resin varnish 1 is prepared by blending polyphenylene oxide (PPO), triallyl isocyanurate (TAIC), a compatibilizer, a flame retardant, a solvent, A compound prepared by blending a thermosetting resin such as an epoxy resin, a curing agent, a curing accelerator, a solvent, or the like can be used.

  The dip roll 5 is provided inside the dip tank 2 and is formed so as to be movable in a direction perpendicular to the central axis (directions indicated by arrows A and B in FIG. 1) in a horizontal plane.

  Further, the pair of squeeze rolls 6 is provided above the dip tank 2 in parallel with the dip rolls 5 and in a horizontal plane, a direction perpendicular to the central axis thereof (parallel to the directions indicated by arrows A and B in FIG. 1). Direction). In addition, the pair of squeeze rolls 6 is configured such that one squeeze roll 6a (6b) is fixed and the other squeeze roll 6b (6a) is moved so as to approach and separate from each other, or both squeeze rolls 6a and 6b are mutually connected. It is formed so that the clearance can be adjusted to 0.05 to 0.50 mm by moving it so as to be close to and away from.

  Further, the dryer 7 has an open bottom surface and is provided with a heater (not shown) and a folding roll 10 provided therein.

  Further, the warpage detector 8 detects the presence or absence and the direction of the warpage of the resin-impregnated base material 4 (prepreg) dried by the dryer 7 in a non-contact manner. Specifically, as shown in FIG. 2A, the resin-impregnated base material 4 is installed in the width direction at a position facing one surface (the upper surface in FIG. 2) of the resin-impregnated base material 4 after drying. A warp detector 8 is formed by arranging a plurality of distance sensors 9 on the rod-shaped frame 11. The distance sensor 9 is not particularly limited as long as the distance from the resin-impregnated base material 4 can be measured. For example, a proximity sensor or the like can be used. When the resin-impregnated base material 4 after drying is not warped as shown in FIG. 3A, each distance sensor 9 is previously set so that the distance between each distance sensor 9 and the resin-impregnated base material 4 becomes equal. The position of is adjusted. Therefore, as shown in FIG. 3B, when the resin impregnated base material 4 after drying has a warp whose upper surface is concave, the distance sensor 9 located in the center in the width direction of the resin impregnated base material 4. 3 and the resin-impregnated base material 4, the distance between the distance sensor 9 located on both sides and the resin-impregnated base material 4 is shorter. Conversely, as shown in FIG. When the resin-impregnated base material 4 has a warp whose bottom surface is concave, in the width direction of the resin-impregnated base material 4, compared to the distance between the distance sensor 9 located at the center and the resin-impregnated base material 4, The distance between the distance sensor 9 located on both sides and the resin-impregnated base material 4 is longer. Thus, the presence / absence of warpage of the resin-impregnated base material 4 can be detected from the distance from the resin-impregnated base material 4 measured by each distance sensor 9, and if there is warpage, its direction and degree Can also be detected.

  The warp detector 8 is preferably formed by providing at least one distance sensor at a position facing the other surface of the resin-impregnated base material 4. Specifically, as shown in FIG. 2B, the resin-impregnated base material 4 is installed in the width direction at a position facing one surface (the upper surface in FIG. 2) of the resin-impregnated base material 4 after drying. A plurality of distance sensors 9 are arranged on the rod-shaped frame 11 and one distance sensor 9 is provided at a position facing the other surface (the lower surface in FIG. 2) of the resin-impregnated base material 4. Is formed. Also in this case, as shown in FIG. 4A, when the resin-impregnated base material 4 after drying is not warped, the distances between the distance sensors 9 and the resin-impregnated base material 4 are equalized in advance. The position of each distance sensor 9 is adjusted. Therefore, as shown in FIGS. 4B and 4C, when the resin-impregnated base material 4 after drying has a warp in which the upper surface or the lower surface becomes a concave surface, in the width direction of the resin-impregnated base material 4, The distance between the distance sensor 9 located on both sides and the resin-impregnated base material 4 is shorter or longer than the distance between the distance sensor 9 and the resin-impregnated base material 4 located. Thus, the presence / absence of warpage of the resin-impregnated base material 4 can be detected from the distance from the resin-impregnated base material 4 measured by each distance sensor 9, and if there is warpage, its direction and degree Can also be detected. Furthermore, as shown in FIG. 2B and FIG. 4, one of a plurality of distance sensors 9 provided at a position facing one surface of the resin-impregnated base material 4 and the other of the resin-impregnated base material 4 If one distance sensor 9 provided at a position facing the surface is opposed, the thickness and variation of the resin-impregnated base material 4 at the position facing these distance sensors 9 can be measured. . In the case where two or more distance sensors 9 are provided at a position facing the other surface of the resin-impregnated base material 4, these distance sensors 9 are connected to the other surface of the resin-impregnated base material 4 as described later. What is necessary is just to arrange in parallel in the rod-shaped flame | frame 11 installed in the width direction of this resin impregnation base material 4 in the position which opposes.

  The warp detector 8 is preferably formed by arranging a plurality of distance sensors 9 in the width direction of the resin-impregnated base material 4 at a position facing the other surface of the resin-impregnated base material 4. Specifically, as shown in FIG. 2 (c), the resin-impregnated substrate 4 is installed in the width direction at a position facing one surface (the upper surface in FIG. 2) of the resin-impregnated substrate 4 after drying. A plurality of distance sensors 9 are arranged side by side on the rod-shaped frame 11 and the rod-shaped frame is installed in the width direction of the resin-impregnated base material 4 at a position facing the other surface (the lower surface in FIG. 2) of the resin-impregnated base material 4. A warp detector 8 is formed by arranging a plurality of distance sensors 9 in parallel. Also in this case, as shown in FIG. 5A, when the resin-impregnated base material 4 after drying is not warped, the distances between the distance sensors 9 and the resin-impregnated base material 4 are equalized in advance. The position of each distance sensor 9 is adjusted. Therefore, as shown in FIGS. 5B and 5C, when the resin-impregnated base material 4 after drying has a warp in which the upper surface or the lower surface becomes a concave surface, in the width direction of the resin-impregnated base material 4, The distance between the distance sensor 9 located on both sides and the resin-impregnated base material 4 is shorter or longer than the distance between the distance sensor 9 and the resin-impregnated base material 4 located. Thus, the presence / absence of warpage of the resin-impregnated base material 4 can be detected from the distance from the resin-impregnated base material 4 measured by each distance sensor 9, and if there is warpage, its direction and degree Can also be detected. Further, as shown in FIGS. 2C and 5, a plurality of distance sensors 9 provided at positions facing one surface of the resin-impregnated base material 4 and the other surface of the resin-impregnated base material 4 are opposed. When the plurality of distance sensors 9 provided at the positions are opposed to each other, the thicknesses and variations of the resin-impregnated base materials 4 at a plurality of positions opposed to the distance sensors 9 can be measured.

  Next, a method for manufacturing a prepreg using the prepreg manufacturing apparatus shown in FIG. 1 will be described. First, the long base material 3 conveyed from the outside to the inside of the dip tank 2 is wound around the lower outer peripheral surface of the dip roll 5 and folded back by the dip roll 5. The material 3 is impregnated with the resin varnish 1, and then the resin-impregnated base material 4 is conveyed outside the dip tank 2. Here, the substrate 3 is not particularly limited. For example, a glass substrate such as a glass cloth or a glass nonwoven fabric having a thickness of 0.01 to 0.20 mm and a width of 500 to 1500 mm can be used. Moreover, the conveyance speed of the base material 3 can be set to 0.5-15.0 m / min, for example. Next, the thickness of the resin-impregnated substrate 4 is adjusted by passing the resin-impregnated substrate 4 conveyed from the inside of the dip tank 2 to the outside between the pair of squeeze rolls 6. Thereafter, the resin-impregnated base material 4 whose thickness is adjusted by the pair of squeeze rolls 6 is conveyed to the inside of the dryer 7, and is conveyed by the folding roll 10 to the outside of the dryer 7. As described above, the resin-impregnated base material 4 is dried by being heated by the heater of the dryer 7 until it is in a semi-cured state (B stage state). In addition, although heating temperature and heating time are not specifically limited, For example, they are 100-200 degreeC and 180-500 second.

  Then, the warp detector 8 detects the presence or absence and the direction of warping of the resin-impregnated base material 4 (prepreg) after drying which has been conveyed from the inside of the dryer 7 to the outside. When the warp detector 8 detects a warp on the resin-impregnated base material 4 after drying, it is generally considered that the same warp is also generated on the resin-impregnated base material 4 before drying. That is, the warpage of the resin-impregnated base material 4 before drying temporarily disappears at the place of the folding roll 10 of the dryer 7, but it occurs again after passing through this place. The convex surface and concave surface formed by the warpage of 4 are the same as the convex surface and concave surface of the resin-impregnated base material 4 after drying, respectively. Here, the warpage is considered to be caused by the difference in shrinkage between the resin on the front and back sides of the resin-impregnated base material 4, and this shrinkage increases when the amount of resin is large and decreases when the amount of resin is small. Become. That is, the surface of the resin-impregnated base material 4 with a large amount of resin has a large shrinkage rate and becomes a concave surface, and the surface with a small amount of resin becomes a convex surface with a small shrinkage rate and causes warping. Therefore, in order to reduce the warp, it is only necessary to scrape off excess resin adhering to the concave surface of the resin-impregnated base material 4. Therefore, the warp detector 8 detects the warp in the resin-impregnated base material 4 after drying. In this case, the dip roll 5 is moved so that the concave surface formed by the warp of the resin-impregnated base material 4 before drying is brought close to one squeeze roll 6a (or 6b) opposed to the concave surface, or before the drying. One squeeze roll 6a (or 6b) facing the concave surface is moved directly to the concave surface formed by warping of the resin-impregnated base material 4 and brought close thereto. When one squeeze roll 6a (or 6b) is moved, the other squeeze roll 6b (or 6a) is usually moved in parallel while maintaining the clearance.

  As described above, when the warp detector 8 detects warpage of the resin-impregnated base material 4 after drying, the thickness of the resin on the concave surface formed by warpage of the resin-impregnated base material 4 before drying is adjusted. The thickness adjustment means 12 increases the amount of resin on the convex surface side which is reduced by the means 12 and formed by warping of the resin-impregnated base material 4 before drying. Thus, by performing feedback control to increase or decrease the amount of resin on both sides of the resin-impregnated base material 4 before drying by the thickness adjusting means 12 according to the presence or absence of the warp of the resin-impregnated base material 4 immediately after drying and the direction, The warp can be reduced while producing the prepreg.

  Here, the moving amount of the dip roll 5 or the squeeze roll 6 varies depending on the maximum warping amount (maximum depth of the concave surface) of the resin-impregnated base material 4 after drying detected by the warp detector 8, but it moves in advance. If the correlation between the amount and the maximum warpage amount is obtained on a trial basis, the movement amount of the dip roll 5 or the squeeze roll 6 can be automatically adjusted based on the test result thereafter. Thus, by performing feedback control of moving the dip roll 5 or the squeeze roll 6 according to the presence / absence and orientation of the resin-impregnated base material 4 immediately after drying, a very thin prepreg having a thickness of less than 0.1 mm is obtained. Even if it exists, the curvature can be reduced, manufacturing such a prepreg. If no warpage is detected in the resin impregnated base material 4 after drying by the warpage detector 8, the dip roll 5 and the squeeze roll 6 are not moved and the resin impregnated base material 4 (prepreg) is conveyed as it is. It is something to be made.

(Embodiment 2)
FIG. 6 shows another example of the prepreg manufacturing apparatus according to the present invention, which also impregnates the base material 3 with the resin varnish 1 while conveying the long base material 3 in the longitudinal direction. A prepreg is manufactured by drying the resin-impregnated base material 4 while being conveyed. Specifically, a pair of roll coaters 13 (13a, 13b), a dryer 7, and a warp detector 8 are used. And is formed. In particular, the thickness adjusting means 12 is formed by a pair of roll coaters 13 (13a, 13b).

  The pair of roll coaters 13 are each formed in a roll shape and are provided in parallel in a horizontal plane below the dryer 7, and the clearance is, for example, 0.02 to 0.50 mm. A varnish supply pipe 15 is provided immediately above each roll coater 13, and the resin varnish 1 is supplied from the varnish supply pipe 15 directly above the roll coater 13, but the supply amount is adjusted for each varnish supply pipe 15. Can be done. Here, as the resin varnish 1, the same one as in the first embodiment can be used. And each roll coater 13 rotates so that it may become downward on the side facing the other roll coater 13, as shown by the arrow of FIG. This rotational speed can be adjusted for each roll coater 13.

  The dryer 7 and the warp detector 8 are formed in the same manner as in the first embodiment.

  Next, a method of manufacturing a prepreg using the prepreg manufacturing apparatus shown in FIG. 6 will be described. First, as the base material 3, the same material as in the first embodiment can be used, and the conveyance speed can be set in the same manner as in the first embodiment. Then, the base material 3 is folded back by a folding roll 10 as necessary and passed between the pair of roll coaters 13 from the bottom to the top. At this time, each roll coater 13 is rotated in the direction indicated by the arrow in FIG. 6 so as to oppose the conveyance direction of the base material 3, and thereby the resin varnish 1 on each roll coater 13 is rubbed into the base material 3. While impregnating, the thickness of the resin-impregnated base material 4 is adjusted. Thereafter, the resin-impregnated base material 4 whose thickness is adjusted by the pair of roll coaters 13 is conveyed to the inside of the dryer 7, and is conveyed by the folding roll 10 to the outside of the dryer 7. As described above, the resin-impregnated base material 4 is dried by being heated by the heater of the dryer 7 until it is in a semi-cured state (B stage state). The heating temperature and the heating time are the same as those in the first embodiment.

  Then, the warp detector 8 detects the presence or absence and the direction of warping of the resin-impregnated base material 4 (prepreg) after drying which has been conveyed from the inside of the dryer 7 to the outside. When warpage is detected in the resin-impregnated base material 4 after drying by the warpage detector 8, as described in the first embodiment, the warp is caused by the surface having a large amount of resin in the resin-impregnated base material 4 being concave. Thus, a surface with a small amount of resin is generated as a convex surface. Therefore, in order to reduce the warp, the amount of resin adhering to the concave surface of the resin-impregnated base material 4 should be small, and the amount of resin adhering to the convex surface should be increased. When warping is detected, the amount of resin on the concave surface formed by warping of the resin-impregnated base material 4 before drying is reduced by one roll coater 13a (or 13b), and the resin-impregnated base material before drying The amount of resin on the convex surface side formed by the warp of 4 is increased by the other roll coater 13b (or 13a). The increase / decrease of the resin amount can be adjusted by increasing / decreasing the supply amount of the resin varnish 1 from each varnish supply pipe 15 or increasing / decreasing the rotation speed of each roll coater 13.

  As described above, when the warp detector 8 detects warpage of the resin-impregnated base material 4 after drying, the thickness of the resin on the concave surface formed by warpage of the resin-impregnated base material 4 before drying is adjusted. The thickness adjustment means 12 increases the amount of resin on the convex surface side which is reduced by the means 12 and formed by warping of the resin-impregnated base material 4 before drying. Thus, by performing feedback control to increase or decrease the amount of resin on both sides of the resin-impregnated base material 4 before drying by the thickness adjusting means 12 according to the presence or absence of the warp of the resin-impregnated base material 4 immediately after drying and the direction, The warp can be reduced while producing the prepreg.

  Here, the amount of resin supplied by each roll coater 13 varies depending on the maximum amount of warpage (maximum depth of the concave surface) of the resin-impregnated base material 4 after drying detected by the warp detector 8, but the amount of resin in advance If the correlation between the roll coater 13 and the maximum warpage amount is obtained on a trial basis, the amount of resin supplied by each roll coater 13 can be automatically adjusted based on the test result. Thus, by performing feedback control of increasing / decreasing the amount of resin on both sides of the resin-impregnated base material 4 before drying by a pair of roll coaters 13 according to the presence / absence and orientation of the resin-impregnated base material 4 immediately after drying. Even a very thin prepreg having a thickness of less than 0.1 mm can reduce the warpage while producing such a prepreg. When the warp detector 8 does not detect warpage of the resin-impregnated base material 4 after drying, the supply amount of the resin varnish 1 from each varnish supply pipe 15 and the rotation speed of each roll coater 13 are changed. Instead, the resin-impregnated base material 4 (prepreg) is conveyed as it is.

(Embodiment 3)
FIG. 7 shows another example of the prepreg manufacturing apparatus according to the present invention, which also impregnates the base material 3 with the resin varnish 1 while conveying the long base material 3 in the longitudinal direction. A prepreg is produced by drying the resin-impregnated base material 4 while being conveyed. Specifically, a pair of gravure coaters 14 (14a, 14b), a dryer 7, and a warp detector 8 are produced. And is formed. In particular, the thickness adjusting means 12 is formed by a pair of gravure coaters 14 (14a, 14b).

  The pair of gravure coaters 14 are each formed in a roll shape and are provided in parallel in a horizontal plane below the dryer 7, and the clearance is, for example, 0.02 to 0.50 mm. Each gravure coater 14 rotates so as to face downward on the side facing the other gravure coater 14 as shown by the arrow in FIG. In addition, a pickup roll 16 is provided directly below each gravure coater 14, and each pickup roll 16 rotates in a direction opposite to the gravure coater 14 directly above. The lower part of each pickup roll 16 is immersed in the resin varnish 1 stored in the varnish tank 17. Here, as the resin varnish 1, the same one as in the first embodiment can be used. The resin varnish 1 pulled up by the rotation of each pickup roll 16 is transferred and supplied from the outer peripheral surface of the pick-up roll 16 to the outer peripheral surface of the gravure coater 14, and the supply amount thereof is the pick-up roll 16 and the gravure coater 14. It can be adjusted by increasing / decreasing the rotation speed.

  The dryer 7 and the warp detector 8 are formed in the same manner as in the first embodiment.

  Next, a method for manufacturing a prepreg using the prepreg manufacturing apparatus shown in FIG. 7 will be described. First, as the base material 3, the same material as in the first embodiment can be used, and the conveyance speed can be set in the same manner as in the first embodiment. Then, the base material 3 is folded back by a folding roll 10 as necessary and passed between the pair of gravure coaters 14 from the bottom to the top. At this time, each gravure coater 14 is rotated in the direction indicated by the arrow in FIG. 7 so as to oppose the conveying direction of the base material 3, and thereby the resin varnish 1 on each gravure coater 14 is rubbed into the base material 3. While impregnating, the thickness of the resin-impregnated base material 4 is adjusted. Thereafter, the resin-impregnated base material 4 whose thickness is adjusted by the pair of gravure coaters 14 is conveyed to the inside of the dryer 7, and is conveyed by the folding roll 10 to the outside of the dryer 7. As described above, the resin-impregnated base material 4 is dried by being heated by the heater of the dryer 7 until it is in a semi-cured state (B stage state). The heating temperature and the heating time are the same as those in the first embodiment.

  Then, the warp detector 8 detects the presence or absence and the direction of warping of the resin-impregnated base material 4 (prepreg) after drying which has been conveyed from the inside of the dryer 7 to the outside. When warpage is detected in the resin-impregnated base material 4 after drying by the warpage detector 8, as described in the first embodiment, the warp is caused by the surface having a large amount of resin in the resin-impregnated base material 4 being concave. Thus, a surface with a small amount of resin is generated as a convex surface. Therefore, in order to reduce the warp, the amount of resin adhering to the concave surface of the resin-impregnated base material 4 should be small, and the amount of resin adhering to the convex surface should be increased. When warping is detected, the amount of resin on the concave surface formed by warping of the resin-impregnated base material 4 before drying is reduced by one gravure coater 14a (or 14b), and the resin-impregnated base material before drying The amount of resin on the convex surface side formed by the warp of 4 is increased by the other gravure coater 14b (or 14a). In addition, increase / decrease in the amount of resin can be adjusted by increasing / decreasing the rotational speed of each pickup roll 16 and each gravure coater 14.

  As described above, when the warp detector 8 detects warpage of the resin-impregnated base material 4 after drying, the thickness of the resin on the concave surface formed by warpage of the resin-impregnated base material 4 before drying is adjusted. The thickness adjustment means 12 increases the amount of resin on the convex surface side which is reduced by the means 12 and formed by warping of the resin-impregnated base material 4 before drying. Thus, by performing feedback control to increase or decrease the amount of resin on both sides of the resin-impregnated base material 4 before drying by the thickness adjusting means 12 according to the presence or absence of the warp of the resin-impregnated base material 4 immediately after drying and the direction, The warp can be reduced while producing the prepreg.

  Here, the amount of resin supplied by each gravure coater 14 varies depending on the maximum amount of warpage (maximum depth of the concave surface) of the resin-impregnated base material 4 after drying detected by the warpage detector 8, but the amount of resin in advance If the correlation between the value and the maximum warpage amount is obtained on a trial basis, the amount of resin supplied by each gravure coater 14 can be automatically adjusted based on the test result. In this way, by performing feedback control in which the resin amount on both sides of the resin-impregnated substrate 4 before drying is increased or decreased by the pair of gravure coaters 14 according to the presence / absence and orientation of the resin-impregnated substrate 4 immediately after drying. Even a very thin prepreg having a thickness of less than 0.1 mm can reduce the warpage while producing such a prepreg. If no warpage is detected in the resin-impregnated base material 4 after drying by the warpage detector 8, the rotational speeds of the pickup rolls 16 and gravure coaters 14 are not changed, and the resin-impregnated base material 4 is used as it is. (Prepreg) is conveyed.

(Embodiment 4)
Another example of the prepreg manufacturing apparatus according to the present invention will be further described. Although not shown in the drawings, this also produces a prepreg by impregnating the base material 3 with the resin varnish 1 while transporting the long base material 3 in the longitudinal direction and drying the resin-impregnated base material 4 while transporting it. Specifically, a pair of die coaters, a dryer 7 and a warp detector 8 are formed. In particular, the thickness adjusting means 12 is formed by a pair of die coaters.

  Each of the pair of die coaters is formed with a slit for discharging the resin varnish 1, and is provided below the dryer 7. One die coater is provided with its slit facing one surface of the substrate 3, and the other die coater is provided with its slit facing the other surface of the substrate 3. Moreover, the lateral width of the slit of each die coater is approximately the same as the width of the base material 3, and the clearance between the slits is, for example, 0.02 to 0.10 mm. Here, as the resin varnish 1, the same one as in the first embodiment can be used. The resin varnish 1 is discharged and supplied from the slits of each die coater, and the supply amount can be adjusted for each die coater.

  The dryer 7 and the warp detector 8 are formed in the same manner as in the first embodiment.

  Next, a method of manufacturing a prepreg using the prepreg manufacturing apparatus formed as described above will be described. First, as the base material 3, the same material as in the first embodiment can be used, and the conveyance speed can be set in the same manner as in the first embodiment. Then, the base material 3 is folded back by a folding roll 10 as necessary and passed between a pair of die coaters from the bottom to the top. At this time, each die coater discharges the resin varnish 1 toward the surface of the base 3, thereby impregnating the base 3 with the resin varnish 1 and adjusting the thickness of the resin-impregnated base 4. Thereafter, the resin-impregnated base material 4 whose thickness is adjusted by a pair of die coaters is transported to the inside of the dryer 7, and is folded by a folding roll 10 to be transported to the outside of the dryer 7. As described above, the resin-impregnated base material 4 is dried by being heated by the heater of the dryer 7 until it is in a semi-cured state (B stage state). The heating temperature and the heating time are the same as those in the first embodiment.

  Then, the warp detector 8 detects the presence or absence and the direction of warping of the resin-impregnated base material 4 (prepreg) after drying which has been conveyed from the inside of the dryer 7 to the outside. When warpage is detected in the resin-impregnated base material 4 after drying by the warpage detector 8, as described in the first embodiment, the warp is caused by the surface having a large amount of resin in the resin-impregnated base material 4 being concave. Thus, a surface with a small amount of resin is generated as a convex surface. Therefore, in order to reduce the warp, the amount of resin adhering to the concave surface of the resin-impregnated base material 4 should be small, and the amount of resin adhering to the convex surface should be increased. When warping is detected, the amount of resin on the concave side formed by warping of the resin-impregnated base material 4 before drying is reduced by one die coater and formed by warping of the resin-impregnated base material 4 before drying. The amount of the resin on the convex side is increased by the other die coater. In addition, the increase / decrease in the resin amount can be adjusted by increasing / decreasing the supply amount of the resin varnish 1 from each die coater.

  As described above, when the warp detector 8 detects warpage of the resin-impregnated base material 4 after drying, the thickness of the resin on the concave surface formed by warpage of the resin-impregnated base material 4 before drying is adjusted. The thickness adjustment means 12 increases the amount of resin on the convex surface side which is reduced by the means 12 and formed by warping of the resin-impregnated base material 4 before drying. Thus, by performing feedback control to increase or decrease the amount of resin on both sides of the resin-impregnated base material 4 before drying by the thickness adjusting means 12 according to the presence or absence of the warp of the resin-impregnated base material 4 immediately after drying and the direction, The warp can be reduced while producing the prepreg.

  Here, the amount of resin supplied by each die coater differs depending on the maximum amount of warpage (maximum depth of the concave surface) of the resin-impregnated base material 4 after drying detected by the warp detector 8, If the correlation with the maximum warpage amount is obtained on a trial basis, the resin amount supplied by each die coater can be automatically adjusted based on the test result. Thus, by performing feedback control to increase or decrease the amount of resin on both sides of the resin-impregnated substrate 4 before drying by a pair of die coaters according to the presence or absence of the warp of the resin-impregnated substrate 4 immediately after drying and the orientation, Even a very thin prepreg having a thickness of less than 0.1 mm can reduce warpage while producing such a prepreg. If no warpage is detected in the resin impregnated base material 4 after drying by the warp detector 8, the supply amount of the resin varnish 1 from each die coater is not changed, and the resin impregnated base material 4 ( Prepreg) is conveyed.

  Hereinafter, the present invention will be specifically described by way of examples.

Example 1
As a prepreg manufacturing apparatus, the prepreg shown in FIG. 1 and provided with the warp detector 8 shown in FIG. 2C was used to manufacture a prepreg under the following conditions.

  A glass substrate having a thickness of 0.04 mm and a width of 1200 mm was used as the long substrate 3. The conveyance speed of the base material 3 was set to 5.0 m / min.

  Moreover, as the resin varnish 1, a PPO resin composition prepared as follows was used.

  First, 30 parts by mass of PPO (manufactured by Nippon GE Plastics Co., Ltd .: trade name “Noryl PX9701”, number average molecular weight 14000), 0.30 parts by mass of bisphenol A as a phenol species, and t-butylperoxyisopropylmono as an initiator Carbonate (manufactured by NOF Corporation: trade name “Perbutyl I”) is blended in 0.27 parts by mass and cobalt naphthenate is blended in 0.008 parts by mass, and 90 parts by mass of toluene as a solvent is added thereto at 80 ° C. A treatment for adjusting the molecular weight of PPO was carried out by mixing for 1 hour and dispersing and dissolving to react. It was 7800 when the number average molecular weight of PPO of the transparent PPO solution obtained after this treatment was measured by gel permeation chromatography (GPC).

  Next, 30 parts by mass of m-TAIC (manufactured by Nippon Kasei Co., Ltd.), 20 parts by mass of p-TAIC (manufactured by Daiichi Kogyo Seiyaku Co., Ltd .: trade name “P-TAIC-1000C”), 5 parts by mass of styrene-butadiene block copolymer (trade name “Tufprene A” manufactured by Asahi Kasei Kogyo Co., Ltd.) as a compatibilizing agent, and decabromodiphenylethane (made by Mitsui Toatsu Fine Co., Ltd.), a brominated organic compound, as a flame retardant : 15 parts by mass of trade name “Planeron BDE”, Br. 2.33% by mass, and α, α ′ bis (t-butylperoxy-m-isopropyl) benzene (manufactured by NOF Corporation: trade name “ A PPO resin composition was prepared by blending 3 parts by mass of PB-P "), mixing it in toluene as a solvent, and dispersing and dissolving it.

  The clearance between the pair of squeeze rolls 6 was adjusted to 0.15 mm.

  Moreover, the heating temperature and heating time by the dryer 7 were set to 170 ° C. and 240 seconds.

  Table 1 shows the warp direction and the maximum warp amount of the resin-impregnated base material 4 after drying detected by the warp detector 8. Moreover, although the dip roll 5 was moved in this case, the direction and amount of this movement are also shown in Table 1. Further, Table 1 also shows the warp direction and the maximum warp amount of the prepreg after cutting finally obtained. This prepreg is obtained by drying the resin-impregnated base material 4 before drying after the portion brought close to the squeeze roll 6 by the movement of the dip roll 5 with a dryer 7 and then cutting it in the width direction.

  As seen in Table 1, it was confirmed that the warp could be reduced while producing the prepreg.

(Example 2-1)
The prepreg manufacturing apparatus shown in FIG. 6 and formed with the warp detector 8 shown in FIG. 2C was used to manufacture a prepreg under the following conditions.

  A glass substrate having a thickness of 90 μm and a width of 1200 mm was used as the long substrate 3. The conveyance speed of the substrate 3 was set in the same manner as in Example 1.

  The same resin varnish 1 as in Example 1 was used.

  The clearance of the pair of roll coaters 13 is adjusted to 0.11 mm, and the ratio (mass ratio) of the amount of resin that one roll coater 13 and the other roll coater 13 supply to the surface of the substrate 3 in the initial stage is 5 : Set to 5.

  Further, the heating temperature and heating time by the dryer 7 were set in the same manner as in Example 1.

  Table 2 shows the warp direction and the maximum warp amount of the resin-impregnated base material 4 after drying detected by the warp detector 8. In this case, the amount of resin supplied by the roll coater 13 on the concave surface side of the resin-impregnated base material 4 is gradually reduced, and the amount of resin supplied by the roll coater 13 on the convex surface side is gradually increased. Table 2 also shows the ratio between the two when the value becomes 0 mm. Further, the thickness of the prepreg after cutting finally obtained is also shown in Table 2. This prepreg has been confirmed by the warp detector 8 to have a maximum warpage of 0 mm.

(Examples 2-2 to 2-5)
A prepreg was produced in the same manner as in Example 2-1, except that the thickness of the substrate 3 was changed as shown in Table 2.

(Example 3-1)
The prepreg manufacturing apparatus shown in FIG. 7 and formed with the warp detector 8 shown in FIG. 2C was used to manufacture a prepreg under the following conditions.

  A glass substrate having a thickness of 90 μm and a width of 1200 mm was used as the long substrate 3. The conveyance speed of the substrate 3 was set in the same manner as in Example 1.

  The same resin varnish 1 as in Example 1 was used.

  Further, the clearance between the pair of gravure coaters 14 is adjusted to 0.11 mm, and the ratio (mass ratio) of the amount of resin that one gravure coater 14 and the other gravure coater 14 supply to the surface of the substrate 3 in the initial stage is 5 : Set to 5.

  Further, the heating temperature and heating time by the dryer 7 were set in the same manner as in Example 1.

  Table 2 shows the warp direction and the maximum warp amount of the resin-impregnated base material 4 after drying detected by the warp detector 8. Further, in this case, the amount of resin supplied by the gravure coater 14 on the concave surface side of the resin-impregnated base material 4 is decreased little by little, and the amount of resin supplied by the gravure coater 14 on the convex surface side is increased little by little. Table 2 also shows the ratio between the two when the value becomes 0 mm. Further, the thickness of the prepreg after cutting finally obtained is also shown in Table 2. This prepreg has been confirmed by the warp detector 8 to have a maximum warpage of 0 mm.

(Example 3-2)
A prepreg was produced in the same manner as in Example 3-1, except that the thickness of the substrate 3 was changed as shown in Table 2.

Example 4
As a prepreg manufacturing apparatus, a prepreg manufactured using a pair of die coaters, a dryer, and a warp detector 8 shown in FIG. 2C was manufactured under the following conditions.

  A glass substrate having a thickness of 90 μm and a width of 1200 mm was used as the long substrate 3. The conveyance speed of the substrate 3 was set in the same manner as in Example 1.

  The same resin varnish 1 as in Example 1 was used.

  Further, the clearance between the pair of die coaters is adjusted to 0.11 mm, and the ratio (mass ratio) of the amount of resin that one die coater and the other die coater supply to the surface of the substrate 3 in the initial stage is 5: 5. Set.

  Further, the heating temperature and heating time by the dryer 7 were set in the same manner as in Example 1.

  Table 2 shows the warp direction and the maximum warp amount of the resin-impregnated base material 4 after drying detected by the warp detector 8. Further, in this case, the amount of resin supplied by the die coater on the concave surface side of the resin-impregnated base material 4 was decreased little by little, and the amount of resin supplied by the die coater on the convex surface side was increased little by little, but the maximum warpage amount was 0 mm. Table 2 also shows the ratio between the two. Further, the thickness of the prepreg after cutting finally obtained is also shown in Table 2. This prepreg has been confirmed by the warp detector 8 to have a maximum warpage of 0 mm.

  As seen in Table 2, it was confirmed that in any of the examples, the warp could be reduced while producing the prepreg.

DESCRIPTION OF SYMBOLS 1 Resin varnish 2 Dip tank 3 Base material 4 Resin impregnation base material 5 Dip roll 6 Squeeze roll 6a Squeeze roll 6b Squeeze roll 7 Dryer 8 Warpage detector 9 Distance sensor 12 Thickness adjustment means 13 Roll coater 13a Roll coater 13b Roll coater 14 Gravure coater 14a Gravure coater 14b Gravure coater

Claims (12)

  In the prepreg manufacturing apparatus, a prepreg is manufactured by impregnating the base material with a resin varnish while transporting a long base material in the longitudinal direction and drying the resin-impregnated base material while transporting. A thickness adjusting means for adjusting the thickness of the resin-impregnated base material by decreasing the amount of resin on one side of the previous resin-impregnated base material and increasing the amount of resin on the other side; A drying machine for transporting and drying the resin-impregnated base material having a thickness adjusted, and a warp detector for detecting the presence or absence and orientation of the resin-impregnated base material dried by the dryer, When warping is detected in the resin-impregnated base material after drying by the warp detector, the resin amount on the concave surface formed by warping of the resin-impregnated base material before drying is calculated by the thickness adjusting means. Decreases, prepreg manufacturing apparatus according to claim the resin amount of the convex surface side formed by the warp of the resin-impregnated substrate before drying can be increased by the thickness adjusting means.   The thickness adjusting means includes a dip tank in which the resin varnish is stored, and the resin varnish is impregnated after impregnating the resin varnish into a long base material provided in the dip tank and conveyed into the dip tank. A dip roll that is folded back to convey the substrate to the outside of the dip tank, and a pair of squeeze rolls that adjust its thickness through the resin-impregnated substrate that has been conveyed from the inside of the dip tank, When both or one of the dip roll and the pair of squeeze rolls are movably provided, and the warp detector detects warpage in the resin-impregnated substrate after drying, the resin-impregnated base before drying The dip roll is moved so that the concave surface formed by warping of the material is brought close to the squeeze roll facing the concave surface, or the squeeze is moved to the concave surface. Prepreg manufacturing apparatus according to claim 1, characterized in that gather by moving the Zuroru.   The thickness adjusting means is formed by a pair of roll coaters, and when warpage is detected in the resin-impregnated substrate after drying by the warp detector, it is formed by warping of the resin-impregnated substrate before drying. The amount of resin on the concave side is reduced by one roll coater, and the amount of resin on the convex side formed by warping of the resin-impregnated base material before drying is increased by the other roll coater. The prepreg manufacturing apparatus described.   The thickness adjusting means is formed by a pair of gravure coaters, and when warpage is detected in the resin-impregnated substrate after drying by the warp detector, it is formed by warping of the resin-impregnated substrate before drying. The amount of resin on the concave side is reduced by one gravure coater, and the amount of resin on the convex side formed by warping of the resin-impregnated substrate before drying is increased by the other gravure coater. The prepreg manufacturing apparatus described.   The thickness adjusting means is formed by a pair of die coaters, and when warpage is detected in the resin-impregnated substrate after drying by the warp detector, it is formed by warping of the resin-impregnated substrate before drying. The amount of resin on the concave surface is reduced by one die coater, and the amount of resin on the convex surface formed by warping of the resin-impregnated substrate before drying is increased by the other die coater. The prepreg manufacturing apparatus described.   The warp detector is formed by arranging a plurality of distance sensors in a width direction of the resin-impregnated base material in a width direction of the resin-impregnated base material at a position facing one surface of the resin-impregnated base material. The prepreg manufacturing apparatus according to claim 1, wherein the prepreg manufacturing apparatus is provided.   7. The prepreg manufacturing apparatus according to claim 6, wherein the warp detector is formed by providing at least one distance sensor at a position facing the other surface of the resin-impregnated base material.   8. The warpage detector is formed by arranging a plurality of the distance sensors in a width direction of the resin-impregnated base material at a position facing the other surface of the resin-impregnated base material. The prepreg manufacturing apparatus described in 1.   The resin varnish is stored in the dip tank, and the resin varnish is impregnated into the long base material conveyed into the dip tank by the dip roll provided in the dip tank. The material is transported to the outside of the dip tank, the thickness of the resin-impregnated base material is adjusted by passing between the pair of squeeze rolls, and then dried while the resin-impregnated base material is transported. If warping is detected in the resin-impregnated base material after drying in the method, the dip roll is moved so that the concave surface formed by warping of the resin-impregnated base material before drying is brought close to the squeeze roll facing this concave surface. Or a method for producing a prepreg, wherein the squeeze roll is moved to the concave surface and brought close to the concave surface.   A prepreg manufactured by manufacturing a prepreg by impregnating the substrate with a resin varnish by a pair of roll coaters while conveying a long substrate in the longitudinal direction, and drying the resin-impregnated substrate while conveying the resin-impregnated substrate. In the manufacturing method, when warping is detected in the resin-impregnated substrate after drying, the amount of resin on the concave surface formed by warping of the resin-impregnated substrate before drying is reduced by one roll coater, A method for producing a prepreg, characterized in that the amount of resin on the convex side formed by warping of the resin-impregnated substrate is increased by the other roll coater.   A prepreg manufactured by manufacturing a prepreg by impregnating the substrate with a resin varnish by a pair of gravure coaters while conveying a long substrate in the longitudinal direction and drying the resin-impregnated substrate while conveying In the manufacturing method, when warpage is detected in the resin-impregnated base material after drying, the amount of resin on the concave surface formed by warpage of the resin-impregnated base material before drying is reduced by one gravure coater, and before drying A method for producing a prepreg, characterized in that the amount of resin on the convex side formed by warping of the resin-impregnated substrate is increased by the other gravure coater.   A prepreg manufactured by manufacturing a prepreg by impregnating a resin varnish into the substrate with a pair of die coaters while conveying a long substrate in the longitudinal direction and drying the resin-impregnated substrate while conveying the resin-impregnated substrate. In the manufacturing method, when warping is detected in the resin-impregnated base material after drying, the amount of resin on the concave side formed by warping of the resin-impregnated base material before drying is reduced by one die coater, and before drying A method for producing a prepreg, characterized in that the amount of resin on the convex side formed by warping of the resin-impregnated substrate is increased by the other die coater.

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