JP2014019141A - Apparatus and method for producing prepreg - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a prepreg having superior quality performance by depositing matrix resin powder uniformly and efficiently on a sheet-like fibrous base material.SOLUTION: A method for producing a prepreg includes the steps of: mixing air into matrix resin powder 30 supplied quantitatively and successively and pushing it by high pressure from the rear side of a supply pipe 32, and electrically charging the matrix resin powder 30 together with air in the supply pipe 32; then floating the matrix resin powder 30 by inputting it into a chamber 37 in which a rising wind is sent from a tip port 32a of the supply pipe 32 through a plurality of holes provided in a bottom surface 37c; discharging the matrix resin powder 30 from a plurality of discharging holes provided in a front surface 37a of the chamber 37; and depositing the matrix resin powder to a sheet-like fibrous base material 50 formed by application of an electric field between the sheet-like fibrous base material 50 connected to the ground by applying a high voltage to a conductive net-like object 39 provided between the front surface 37a of the chamber 37 and a sheet-like fibrous base material 50.

Description

  The present invention relates to a prepreg manufacturing apparatus and a prepreg manufacturing method for manufacturing a prepreg by attaching a matrix resin powder to a sheet-like fiber base material which is a reinforcing material such as a carbon fiber fabric or a carbon fiber UD tape.

Conventionally, a prepreg is a method in which a resin is melt-coated on a sheet-like fiber substrate (melting method), a method in which a resin is dissolved in a solvent (solvent method), and a film-like resin is heat-press-molded on a sheet-like fiber material. The method (film stacking method) was taken. However, the following drawbacks are pointed out when a thermoplastic resin having a high viscosity at the time of melting is used.
In the melting method, the viscosity at the time of melting is high, so impregnation does not work well, and uneven coating occurs.In addition, the resin dissolves the resin in an organic solvent, so there are problems such as air pollution during drying, and the resin that can be dissolved in the solvent. The types of are limited. In the film stacking method, since the impregnation distance between the film and the sheet-like fiber base material is long, sufficient impregnation is impossible.
Therefore, there are many types of resin that can be applied, a short impregnation distance, and a method for producing a prepreg by attaching a resin powder to a sheet-like fiber substrate in a charged state as a technique that does not cause air pollution ( For example, see Patent Documents 1 and 2).

PCT WO 03/024609 A2 Japanese Patent Laid-Open No. 11-189661

For example, as shown in FIG. 7, the invention described in Patent Document 1 includes a plurality of brushes connected to a high-voltage DC power source through which air that has been input into an accelerating vessel 12 through an inlet 11 from a blower, a compressor, or the like is connected. 13 is charged from the inside of the storage box 15 by utilizing the Benchery effect that causes the pressure to be reduced by providing the charged air with the compression portion 14 having a narrowed part of the flow path. By mixing the powder 17 sucked up through 16, the powder 17 is also charged.
Then, a solid-gas two-phase flow formed by mixing air and powder 17 is discharged from a hole 18 formed at the tip of the acceleration vessel 12 toward the carbon fiber fabric 20 that is continuously pulled up in the chamber 19. Then, the charged powder 17 is attached to the carbon fiber fabric 20 to produce a prepreg.

However, in the conventional technique as shown in FIG. 7, the flow rate is set so that the powder 17 does not fall on the bottom of the accelerating container 12 during the supply of the solid-gas two-phase flow obtained by mixing the air and the powder 17. In addition to the need to increase, the flow rate is further increased due to the provision of the hole 18 having a narrow channel, so that the inertial energy of the powder 17 is increased. That is, the powder 17 is attracted to the carbon fiber fabric 20 by the action of electrostatic force acting on the charged powder 17, but the inertial force of the powder 17 is considerably larger than the attraction force. Develops in contact with the carbon fiber fabric 20 but bounces without adhering.
Conversely, when the flow rate of the solid-gas two-phase flow formed by mixing the air and the powder 17 is slowed, the powder 17 falls to the bottom of the accelerating vessel 12 and accumulates little by little. As a result, the area in the accelerating container 12 is further reduced, and the flow velocity is increased.

Further, in the conventional example, the powder 17 is sucked up from the storage box 15 through the tube 16 using the Benchery effect, so that the pressure changes according to the flow velocity of the charged air. As a result, the suction amount of the powder 17 changes and is not stable. In addition, when the tube 16 is easily clogged due to the influence of the cohesiveness and humidity of the powder 17, and the powder 17 is partially clogged, the powder 17 is dispersed unevenly. It is difficult to control the supply so as to be spatially uniform. If the powder 17 is allowed to adhere to the carbon fiber fabric 20 in a non-uniform state, the amount of adhesion will be uneven, and a prepreg with stable quality cannot be produced.
In addition, in the conventional example, the powder 17 is indirectly charged by first charging the air and then hitting the charged air against the powder 17. Therefore, the powder 17 is directly charged. There is also a problem that charging efficiency is lower than in the case.

  Patent Document 2 describes an electrostatic fluidized dipping method or an electrostatic spray method as a method for producing a prepreg by attaching a resin powder to a sheet-like fiber substrate in a charged state. In particular, the configuration of the manufacturing apparatus is not disclosed.

  Accordingly, an object of the present invention is to produce a prepreg excellent in quality performance by uniformly and efficiently attaching resin powder to a sheet-like fiber base material.

In order to achieve the above object, the prepreg production apparatus of the present invention is a prepreg production apparatus for producing a prepreg by attaching a matrix resin powder (30) to a sheet-like fiber base material (50),
A feeder (31) for continuously feeding the matrix resin powder (30) in a fixed amount, a supply pipe (32) extending substantially horizontally, and the matrix resin powder (30) supplied by the feeder (31). An air supply device (33, 34, 35) for mixing air and pushing it from the rear side of the supply pipe (32) at high pressure; and the matrix resin powder (30) provided with the supply pipe (32) together with air A charger (36) for charging and a front end (32a) of the supply pipe (32) are inserted into the rear surface (37b), a plurality of holes are provided in the bottom surface (37c), and a plurality of holes are provided on the front surface (37a). Air is sent into the chamber (37) through a chamber (37) provided with discharge holes and a plurality of holes provided in the bottom surface (37c) of the chamber (37), and the matrix resin powder (30 The sheet-like fiber base is provided between the blower (38) for floating the air, the front surface (37a) of the chamber (37) and the sheet-like fiber substrate (50), and is connected to the ground by applying a high voltage. A conductive network (39) to which an electric field is applied between the material (50) and
The matrix resin powder (30) discharged from the discharge hole of the chamber (37) is adhered to the sheet-like fiber substrate (50).

  Further, the present invention is characterized in that a plurality of cylinders (41a) or elliptical cylinders extending substantially perpendicular to the extending direction of the supply pipe (32) are provided in the supply pipe (32) before the charger (36). And

  In addition, the present invention includes a rectifying grid (42) that is provided in the chamber (37) and rectifies by suppressing vortex flow.

  Further, according to the present invention, the air supply device (33, 34, 35) passes a solid-gas two-phase flow in which the matrix resin powder (30) and air are mixed, and inputs to the supply pipe (32). And a plurality of slit portions (344).

The prepreg production method of the present invention is a prepreg production method for producing a prepreg by attaching a matrix resin powder (30) to a sheet-like fiber substrate (50),
Air is mixed into the matrix resin powder (30), which is continuously supplied in a constant quantity, and is pushed in from the rear side of the supply pipe (32) at a high pressure, and the matrix resin powder (30) is supplied into the supply pipe (32). Is charged together with air, and then the air rising from the tip opening (32a) of the supply pipe (32) through a plurality of holes provided in the bottom surface (37c) is fed into the chamber (37). The matrix resin powder (30) is floated and discharged, and the matrix resin powder (30) is discharged from a plurality of discharge holes provided in the front surface (37a) of the chamber (37). 37) The sheet-like fiber substrate (50) ground-connected by applying a high voltage to the conductive mesh (39) provided between the front surface (37a) of the sheet 37 and the sheet-like fiber substrate (50). )When Characterized in that so as to adhere to the sheet-like fiber base materials each of which an electric field is applied (50) between.

  Note that symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and modes for carrying out the invention described later.

According to the present invention, since the matrix resin powder is mixed with air and pushed from the rear side of the supply pipe at high pressure, the flow velocity of the solid-gas two-phase flow composed of the air charged in the supply pipe and the matrix resin powder Can be set fast, and the matrix resin powder does not settle and deposit in the supply pipe due to the slow flow rate of the solid-gas two-phase flow as shown in the conventional example.
In the present invention, a solid-gas two-phase flow composed of charged air and matrix resin powder is not discharged from the supply pipe and brought into contact with the sheet-like fiber base material at a high flow rate. The high pressure applied between the sheet-like fiber substrate and the conductive network after slowing the flow velocity of the solid-gas two-phase flow in the chamber once by feeding the phase flow into the chamber having a larger opening area than the supply pipe Since the electric field is fed into the electric field, the flow rate of the resin powder is higher than the force that the matrix resin powder is attracted to the sheet fiber substrate such as carbon fiber fabric by the action of electrostatic force, as shown in the conventional example. The inertial force due to is never much larger.
As a result, as shown in the conventional example, the matrix resin powder contacts the sheet-like fiber substrate but does not rebound without adhering. In the present invention, the matrix resin powder does not rebound. It is possible to obtain a prepreg having a uniform quality and excellent quality performance.

  In addition, according to the present invention, the matrix resin powder is continuously supplied in a fixed amount by the feeder, then mixed with air by the air supply device, and pushed in at a high pressure from the rear side of the supply pipe. Such a Benchery effect is not used to suck up the powder, but the amount of the matrix resin powder can be accurately supplied.

  Also, the charging method is not to charge the matrix resin powder indirectly after charging the air as in the conventional example, but to charge the air and the matrix resin powder directly from the beginning at the same time. The efficiency is not particularly bad.

  Further, according to the present invention, since a plurality of cylinders or elliptical columns extending substantially perpendicular to the direction in which the supply pipe extends are provided in front of the charger in the supply pipe, the solid-gas two-phase flow passes through the cylinder or the elliptical cylinder. The two-phase flow is uniformly dispersed, and the aggregated matrix resin powder is crushed and broken apart. Thereby, the solid-gas two-phase flow is a mixture of air and matrix resin powder more uniformly.

  Further, according to the present invention, since the rectifying grid that rectifies the vortex by suppressing the vortex is provided in the chamber, the matrix resin powder can be adhered to the sheet-like fiber substrate without unevenness.

  Further, according to the present invention, since the solid-gas two-phase flow is allowed to pass through the plurality of slit portions before being input to the supply pipe, the solid-gas two-phase flow is a uniform flow.

  In addition, like the prepreg manufacturing apparatus and prepreg manufacturing method of the present invention, the chamber is obtained by once sending a solid-gas two-phase flow composed of charged air and matrix resin powder into a chamber having a larger opening area than the supply pipe. In the above-mentioned Patent Documents 1 and 2, the flow rate of the solid-gas two-phase flow is slowed down and then fed into the high-voltage electric field applied between the sheet-like fiber base material and the conductive network. Not listed.

It is a side view which shows the structure outline | summary of the prepreg manufacturing apparatus which concerns on embodiment of this invention. It is an enlarged side view which shows the internal structure around the air multiplier shown in FIG. It is an enlarged side view which shows the internal structure around the slit nozzle shown in FIG. It is an enlarged side view which shows the internal structure around the dispersion | distribution mixing part shown in FIG. FIG. 2 is an enlarged side view showing an internal configuration around a rectifying grid shown in FIG. 1. It is a side view which shows the structure outline | summary of another prepreg manufacturing apparatus which concerns on embodiment of this invention. It is a partial cross section side view which shows the structure outline | summary of the prepreg manufacturing apparatus which concerns on a prior art example.

A prepreg manufacturing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 shows a schematic configuration of a prepreg manufacturing apparatus according to an embodiment of the present invention, and FIGS. 2 to 5 show main parts of the apparatus configuration shown in FIG.

A prepreg manufacturing apparatus according to an embodiment of the present invention is an apparatus that manufactures a prepreg by attaching a matrix resin powder 30 to a sheet-like fiber base material that is a reinforcing material such as a carbon fiber fabric 50 or a UD tape. As shown in FIG. 1, air is supplied to the biaxial biaxial feeder 31 that continuously supplies the matrix resin powder 30 in a constant amount, the supply pipe 32 that extends substantially horizontally, and the resin powder 30 that is supplied by the feeder 31. An air supply device comprising a compressor 33, an air multiplier 34, and a first blower 35 that are mixed and pushed from the rear side of the supply pipe 32 at a high pressure, and a casing (chamber) 37 provided on the downstream side of the supply pipe 32 A second blower 38 for sending air from the bottom surface 37c of the housing part 37 into the housing part 37, and a conductive mesh (mesh electrode) 39 provided on the front surface 37a of the housing part 37 are provided.
The matrix resin powder 30 is generally made of thermoplastic resin such as PA6, PA11, PA66, PPS, PBT, PET, PEEK, PEKK, PSU, PES, PAI, PET, PC, phenol resin, etc. The thermosetting resin or natural resin may be used. Further, the sheet-like fiber base material may be made of a conductive material such as metal fibers other than carbon fiber and glass fibers deposited with aluminum.

As shown in FIG. 2, the air multiplier 34 includes a funnel-shaped duct 341 and an air multiplier 342 provided so as to surround the duct 341, and the air multiplier 342 is provided outside. A plurality of small-diameter holes 343 into which high-pressure air is input from the provided compressor 33 are provided along the periphery, and a large amount of air is taken in while increasing the flow rate by the Coanda effect.
Further, as shown in FIG. 3, a plurality of slit nozzles 344 are provided at the bottom of the air multiplier 34, that is, immediately before the connection position with the supply pipe 32, and pass through the plurality of slit nozzles 344. The solid-gas two-phase flow is made uniform.
Thereby, the solid-gas two-phase flow formed by mixing air with the matrix resin powder 30 supplied by the feeder 31 is pushed into the supply pipe 32 at a high pressure and mixed with the air generated by the first blower 35. . Note that the wind sent from the first blower 35 also passes through the plurality of slit nozzles 351. At this time, the air pressure of the solid-gas two-phase flow sent from the air multiplier 34 side to the midway position of the supply pipe 32 is arranged on the rear side of the supply pipe 32, and winds from the rear side of the supply pipe 32 toward the front side. The solid air two-phase flow sent from the air multiplier 34 side is struck into the air flow from the first blower 35, which is larger than the air pressure by the first blower 35 that sends the air.

Further, as shown in FIG. 4, a dispersion / mixing unit 41 including a plurality of cylinders 41a is provided on the upstream side of the connection position with the air multiplier 34 in the supply pipe 32, and on the further upstream side, a charger is provided. 36 is provided.
The cylinder 41a constituting the dispersion mixing unit 41 extends in a direction substantially perpendicular to the direction in which the supply pipe 32 extends (front and back directions orthogonal to the paper surface of FIG. 4), and is a solid-gas two-phase flowing through the supply pipe 32. The flow is uniformly dispersed and the agglomerated matrix resin powder 30 is crushed into pieces. As a result, the solid-gas two-phase flow is a mixture of air and the matrix resin powder 30 more uniformly. In addition, the flow rate of the fixed two-phase flow becomes very fast by passing through a narrow channel between the adjacent cylinders 41a.
The charger 36 charges the matrix resin powder 30 negatively (or may be positive) together with air. For example, “Boxer Charger (BCS-70)” manufactured by Masuda Laboratory Co., Ltd. is used. Thus, a high charge amount is given to the matrix resin powder 30. The charged matrix resin powder 30 is sent to the downstream side of the supply pipe 32 without adhering to the wall surface of the charging portion of the charger 36.

The housing part 37 has a rectangular parallelepiped shape, and the front end 32a of the supply pipe 32 is inserted in the approximate center of the rear surface 37b. Although not particularly limited, the length of the housing portion 37 in the front-rear direction is set to be approximately the same as the length of the supply pipe 32. In addition, a net 43 having a plurality of holes is attached to the bottom surface 37 c of the housing part 37, and the wind from the second blower 38 supplied to the duct 44 provided below the net 43 is passed through the net 43. It takes in in the housing part 37 and the upward flow is generated. By this upward flow, the matrix resin powder 30 in the fixed two-phase flow introduced from the distal end 32 a of the supply pipe 32 is prevented from being suspended and precipitated in the housing portion 37.
Further, a rectifying grid 42 as shown in FIG. The rectifying grid 42 has a honeycomb structure made of an insulator, and suppresses the generation of vortices and swirling flows in the fixed two-phase flow to achieve rectification.

  In addition, a high voltage is applied to the conductive mesh 39 provided on the front surface 37 a of the housing portion 37, and a high-voltage electric field is formed between the conductive mesh 39 and the carbon fiber fabric 50 grounded in front of the conductive mesh 39. Has been applied. A negative high voltage is applied to the conductive mesh 39, and the conductive mesh 39 is negatively charged by a charger 36 provided in the supply pipe 32, and the mesh of the conductive mesh 39 (the discharge hole of the casing portion 37). The matrix resin powder 30 discharged from the above is adhered to the carbon fiber fabric 50 with a strong adhesive force, and even if the matrix resin powder 30 bounces on the carbon fiber fabric 50, the matrix resin powder 30 is reattached. Yes. When the matrix resin powder 30 is positively charged, a positive high voltage is applied to the conductive mesh 39.

Next, a method for manufacturing a prepreg using the prepreg manufacturing apparatus configured as described above will be described.
As shown in FIG. 2, when matrix resin powder 30 is continuously supplied from the biaxial feeder 31 through the upper part of the duct 341 of the air multiplier 34, high-pressure air is input from the compressor 33 and the flow rate is increased by the Coanda effect. The matrix resin powder 30 is sent toward the supply pipe 32 as a fixed two-phase flow mixed with air by the action of the air multiplier 342 that takes in a large amount of air while increasing the air flow.
At this time, the wind from the first blower 35 is sent to the supply pipe 32 from the rear side to the front side, but is sent from the air multiplier 34 side to the midway position of the supply pipe 32 rather than the air pressure of the wind. The air pressure of the solid-gas two-phase flow generated is larger, and the solid-gas two-phase flow from the air multiplier 34 side is struck into the air flow from the first blower 35 and sent to the front side of the supply pipe 32.

The solid-gas two-phase flow pushed into the supply pipe 32 first passes through the dispersion and mixing unit 41 and is uniformly dispersed and the aggregated matrix resin powder 30 is crushed and broken apart. Further, the flow rate of the solid-gas two-phase flow is increased by passing through a narrow channel between adjacent cylinders 41 a in the dispersion mixing unit 41.
Next, in the solid-gas two-phase flow, both the matrix resin powder 30 and the air are negatively charged by the charger 36 provided in the supply pipe 32, and then the inside of the housing portion 37 from the distal end 32 a of the supply pipe 32. It is thrown into.

Since the solid-gas two-phase flow introduced from the supply pipe 32 into the casing 37 having a large opening area has a low flow velocity, the matrix resin powder 30 may drop due to its own weight and settle on the bottom surface 37c of the casing 37. However, since the rising air is sent from the bottom surface 37c of the housing portion 37 through the net 43 having a plurality of holes, the matrix resin powder 30 is suspended inside the housing portion 37 to prevent precipitation. Is done.
Since the matrix resin powder 30 in the housing part 37 is negatively charged, it moves toward the front surface 37a of the housing part 37 while being uniformly dispersed while generating repulsion and repelling each other. By passing through the rectifying grid 42, the vortex and swirl are removed and rectified, and further proceed to the front surface 37 a side of the housing portion 37. At this time, since the wind rising from both the front side and the rear side across the rectifying grid 42 is sent from the bottom surface 37c of the housing portion 37, the matrix resin powder 30 is in a floating state and the conductive net 39 It is discharged from the mesh.

  The negatively charged matrix resin powder 30 discharged from the mesh of the conductive mesh 39 to which a positive high voltage is applied is firmly bonded to the carbon fiber fabric 50 grounded to the ground. The prepreg is manufactured by applying force. The prepreg referred to in the present invention includes a so-called semi-preg in which the amount of the matrix resin powder 30 attached to the carbon fiber fabric 50 is suppressed.

According to this, since air and the matrix resin powder 30 are mixed and pushed in from the rear side of the supply pipe 32 at a high pressure, a solid gas composed of the air charged in the supply pipe 32 and the matrix resin powder 30 is obtained. The flow rate of the two-phase flow is high, and the resin powder does not precipitate and deposit in the supply pipe due to the low flow rate of the solid-gas two-phase flow as shown in the conventional example.
The solid-gas two-phase flow composed of the charged air and the matrix resin powder 30 is not discharged from the supply pipe 32 and brought into contact with the carbon fiber fabric 50 at a high flow rate. Is once fed into the housing part 37 having a larger opening area than the supply pipe 32 to slow down the flow rate of the solid-gas two-phase flow in the housing part 37 and then applied between the carbon fiber fabric 50 and the conductive mesh 39. As shown in the conventional example, the inertial force due to the flow velocity of the resin powder is more than the force that the resin powder is attracted to the carbon fiber fabric by the action of electrostatic force. It doesn't get quite big.
As a result, as shown in the conventional example, the matrix resin powder 30 abuts on the carbon fiber fabric 50 but does not rebound without adhering to it, and evenly adheres to the carbon fiber fabric 50 and has excellent quality performance. Prepreg is obtained.

In the embodiment of the present invention, one rectifying grid 42 is provided in the housing portion 37. However, it may be provided in multiple stages so as to further suppress the generation of vortex and swirl in the fixed two-phase flow. .
FIG. 6 shows an example in which two rectifying grids 42 are provided in the casing portion 37 so as to be separated from each other. Also, the position where the rectifying grid 42 is provided can be considered in various ways, and the casing portion that is not affected by the wind sent from the bottom surface 37c of the casing portion 37 from the second blower 38, like the rectifying grid 42B shown in FIG. It can also be arranged on the front side in 37.
Further, although the conductive mesh 39 is provided on the front surface 37a of the housing part 37, the front surface 37a of the housing part 37 is provided with a plurality of discharge holes for discharging the matrix resin powder 30, and the conductive mesh 39 is provided on the housing 37. You may make it provide in the position spaced apart from the front surface 37a of the part 37. FIG.

Further, in the embodiment of the present invention, the dispersion mixing unit 41 is configured by a plurality of identically shaped cylinders 41a, but may be configured by a plurality of elliptical columns having the same shape instead.
Further, in the embodiment of the present invention, the dispersion mixing unit 41 and the rectifying grid 42 are provided to further homogenize the solid-gas two-phase flow. However, it can be omitted, and the air multiplier 34 can be omitted. By providing a plurality of slit nozzles 344 at the bottom of the solid gas, the solid-gas two-phase flow is made more uniform, but this can also be omitted. Further, an air multiplier 342 is provided as the air multiplier 34 so that a large amount of air is taken in while increasing the flow velocity by the Coanda effect. However, by setting the pressure by the compressor 33 and the first blower 35 to be large, The air multiplier 342 can be omitted as long as the flow velocity of the phase flow can be increased.

DESCRIPTION OF SYMBOLS 11 Inlet 12 Acceleration container 13 Bulge 14 Compression part 15 Storage box 16 Tube 17 Powder 18 Hole 19 Chamber 20 Carbon fiber fabric 30 Matrix resin powder 31 Feeder 32 Supply pipe 32a Tip port 33 Compressor 34 Air multiplier 341 Duct 342 Air multiplier 343 Small hole 344 Slit nozzle 35 First blower 351 Slit nozzle 36 Charger 37 Housing part 37a Front surface 37b Rear surface 37c Bottom surface 38 Second blower 39 Conductive network 41 Dispersion and mixing unit 41a Cylinder 42 Rectifier grid 42A Rectifier grid 42B Rectifier grid 43 Net 44 Duct 50 Carbon fiber fabric

Claims (5)

A prepreg manufacturing apparatus for manufacturing a prepreg by attaching a matrix resin powder to a sheet fiber substrate,
A feeder that continuously and quantitatively supplies the matrix resin powder;
A supply pipe extending substantially horizontally;
An air supply device that mixes air into the matrix resin powder supplied by the feeder and pushes it at a high pressure from the rear side of the supply pipe;
A charger that is provided in the supply pipe and charges the matrix resin powder together with air;
A chamber in which the front end of the supply pipe is inserted into the rear surface, a plurality of holes are provided in the bottom surface, and a plurality of discharge holes are provided in the front surface;
A blower that sends air into the chamber through a plurality of holes provided in the bottom surface of the chamber to float the matrix resin powder;
Provided between the front surface of the chamber and the sheet-like fiber base material, and comprising a conductive net that is applied with an electric field between the sheet-like fiber base material applied with a high voltage and grounded,
The prepreg manufacturing apparatus, wherein the matrix resin powder discharged from the discharge hole of the chamber is adhered to the sheet-like fiber base material.   2. The prepreg manufacturing apparatus according to claim 1, wherein a plurality of cylinders or elliptic cylinders extending substantially perpendicular to a direction in which the supply pipe extends are provided in a stage preceding the charger in the supply pipe.   3. The prepreg manufacturing apparatus according to claim 1, further comprising a rectifying grid provided in the chamber and configured to rectify while suppressing eddy currents. 4.   The said air supply apparatus has a some slit part which lets the solid-gas two-phase flow with which the said matrix resin powder and air were mixed pass, and inputs into the said supply pipe | tube. The prepreg manufacturing apparatus according to any one of the above. A prepreg manufacturing method for manufacturing a prepreg by attaching a matrix resin powder to a sheet fiber substrate,
After the air is mixed into the matrix resin powder that is continuously supplied in a constant amount and pressed at a high pressure from the rear side of the supply pipe, the matrix resin powder is charged together with air in the supply pipe,
From the front end of the supply pipe, the matrix resin powder is floated by putting it into a chamber in which wind rising through a plurality of holes provided in the bottom surface is sent,
The matrix resin powder is discharged from a plurality of discharge holes provided on the front surface of the chamber,
The electric field is applied between the sheet-like fiber substrate connected to the ground by applying a high voltage to the conductive network provided between the front surface of the chamber and the sheet-like fiber substrate. A method for producing a prepreg characterized by being attached to a sheet-like fiber base material.