JPH0483608A - Manufacture and its manufacturing device of prepreg sheet - Google Patents

Abstract

PURPOSE:To apply uniform tension in a radial direction to a woven fabric centering around a pressing part and resin is infiltrated uniformly into the title prepreg sheet, by a method wherein a part of a bag body having elasticity is pressed against a composite material arranged on a table and a pressure medium is fed within the bag body. CONSTITUTION:A rod piercing through hole 111 through which a center rod 12 is pierced is formed in the central part of a stationary part 11 of a bag body through a bearing and a pressure medium introducing hole 112 for leading a pressure medium AR within the bag body 10 is formed in the fringe part. The bag body 10 begins to expand gradually hollowing feed of the pressure medium AR. At this time, the central part of the bottom part 101 of the bag body 10 is pressed against the central part of woven fabric 4 by the center rod 12. The bag body 10 is expanded away in radial state while applying fixed tensile force and pressing force to a composite material comprised of mold release paper 2, a resin sheet 3, the disclike woven fabric 4 and a mold release film 5 centering around a pressing part by the center rod 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing prepreg sheets used as chain parts of FRP disks, FRP tanks, etc.

(Prior technology) Planar prepreg sheets manufactured by impregnating various fibers such as carbon fibers and glass fibers of woven fabric with heat-molten resin have excellent stress and vibration characteristics. Because of this, it is used in a wide range of fields as a reinforcing material.

For example, as shown in Fig. 2, a disc-shaped prepreg sheet A made of carbon fibers CB arranged in the radial direction and the circumferential direction is exposed to various vibrations, heat, radio waves, etc. in the circumferential direction, such as a high-speed rotating body. It is widely used as a reinforcing material for advanced composite materials that require uniform properties, such as FRP pressure tanks, speaker cones, and disc brake wheels.

FIG. 3 is an explanatory diagram of an example of a conventional method for manufacturing prepreg sheets. In FIG. 3, 1 is a table for heating and cooling, 2 is a release paper, 3 is a resin sheet, 4 is a disc-shaped woven fabric, 5 is a release film, and 6 is an impregnated layer roller.

Conventionally, in order to manufacture a prepreg sheet, as shown in FIG. 3, first, a resin sheet 3 made by coating a release paper 2 with a thin film of resin and a disk-shaped woven fabric 4 are stacked and placed on a table 1. .

Next, by applying electricity to the table 1, the resin sheet 3 is heated to, for example, 150° C. or higher and melted.
By handling the release film 5 in a radial manner, for example, using a roller 6, the entire disc-shaped woven fabric 4 is sufficiently impregnated with the resin.

Next, the heating temperature of the table 1 is lowered, and the temperature of the disc-shaped woven fabric 4 is lowered to, for example, about 50° C. to cool it.
By curing the resin, manufacturing of the prepreg sheet is completed.

(Problem to be Solved by the Invention) However, in the above conventional manufacturing method, the disk-shaped woven fabric 4
It is not possible to apply uniform tension in the radial direction to
There have been disadvantages in that the impregnation of the resin is uneven, or the woven fabric 4 is impregnated with the resin in a loose state, making it difficult to manufacture a prepreg sheet with sufficient strength characteristics.

The present invention has been made in view of such circumstances, and its purpose is to be able to apply uniform tension in the radial direction, to uniformly impregnate resin, and to prevent fibers from loosening. An object of the present invention is to provide a method for manufacturing a prepreg sheet that can perform the following steps, and a manufacturing device for carrying out the method.

(Means for Solving the Problems) In order to achieve the above object, claim (1) provides a method of heating and pressurizing a composite formed by overlapping a resin sheet and a woven fabric on a table. In the method for manufacturing a prepreg sheet in which the woven fabric is impregnated with a hot molten resin, a part of the elastic bag is pressed against the composite during the pressurization, and a pressure medium is introduced into the bag. I tried to supply it.

Moreover, in claim (2), the bag is pressed against the composite from inside the bag so that the center portions of the bag and the woven fabric coincide.

Further, in claim (3), a composite formed by overlapping a resin sheet and a woven fabric is arranged, and the resin sheet is heated,
A prepreg sheet manufacturing apparatus equipped with a heating table for melting, comprising: an elastic bag; and a pressing member that presses a part of the bag from approximately the center of the bottom of the bag onto a composite placed on the table. and pressure medium supply means for supplying a pressure medium into the bag so as to spread the bag.

(Function) According to claim (1), a resin sheet and a woven fabric are placed on the table in a composite state in which they are layered. This heats the composite and melts the resin sheet.

On the other hand, a portion of the bag is pressed against the composite. In this state, pressure medium is gradually supplied into the bag.

As the pressure medium is supplied, the bag gradually expands radially around the pressing portion while applying a predetermined tension and pressing force to the composite.

As a result, the woven fabric is impregnated with the molten resin, and since each fiber of the woven fabric receives uniform tension from the bag in the radial direction, it does not loosen during resin impregnation.

Further, according to claim (2), the center part of the bag body is pressed against the center part of the woven fabric, and the pressure medium is supplied into the bag body in this state. Therefore, this method is effective for disk-shaped woven fabrics.

Moreover, according to claim (3), a resin sheet and a woven fabric are placed on the table in a composite state in which they are layered. This heats the composite and melts the resin sheet.

On the other hand, the center of the bottom of the bag is pressed against the composite by a pressing member from inside the bag.

In this state, the pressure medium is gradually supplied into the bag body by the pressure medium supply means.

As the pressure medium is supplied, the bag gradually expands radially around the pressed portion by the pressing member while applying a predetermined tension and pressing force to the composite.

As a result, the woven fabric is impregnated with the molten resin, and since each fiber of the woven fabric receives uniform tension from the bag in the radial direction, it does not loosen during resin impregnation.

(Example) FIG. 1 is a sectional view showing an example of a prepreg sheet manufacturing apparatus to which the method of the present invention is applied, and the same components as those in FIG. 3 showing the conventional example are denoted by the same symbols.

Namely, 1 is a table for heating and cooling, 2 is a release paper, and 3 is a table for heating and cooling.
1 is a resin sheet, 4 is a disk-shaped woven fabric, 5 is a release film, 1
0 is a bag, 11 is a bag fixing part, 12 is a center rod as a pressing member, 13 is a rod pressing part, 14a, 14
b is a pressing cylinder, and 15 is a pressure medium supply device (pressure medium supply means).

The table 1 has a built-in temperature-adjustable heater (not shown), and heats and melts the resin sheet 3 and the like disposed on the top surface at a predetermined adjustment temperature, for example, 150'C or more, and also The resin is cooled after being melted at a certain temperature.

The bag body 10 is made of a rubber bag that is elastic and has excellent heat resistance, and has a disc-shaped bottom part 101.

A center rod 1 is located in the center of the bottom 101 inside the bag 10.
A rod support part 102 is formed to support the tip of the bottom part 2, and is arranged so that the outer surface of the bottom part 101 comes into contact with the release film 5 during production of the prepreg sheet.

The bag fixing part 11 fixes and holds the peripheral edge of the bag 1o,
The airtightness inside the bag body 10 is maintained. In addition, the bag body fixing part 1
A bearing is interposed in the center of the center rod 1.
A rod insertion hole 111 through which the bag body 2 is inserted is formed, and a pressure medium introduction hole 112 for guiding the pressure medium AR into the bag body 1o is formed at the peripheral edge.

The center rod 12 has a tip end 121 that is connected to the bag body fixing part 1.
It is inserted into the rod insertion hole 111 of No. 1 and supported by the rod support part 102 inside the bag body 10. In addition, the rear end portion 122
A flange 122a is formed at the center rod 12, and a compression spring 123 is disposed between the flange 122a and the rod pressing portion 13 to apply a biasing force in the vertical direction to the center rod 12.

The rod pressing portion 13 has a cylindrical shape with one end open, and a central portion 131a of its upper surface 131 is formed in a convex shape, and applies a compressive force to the compression spring 123 through the central portion 131a. In addition, its peripheral portion is the pressing cylinder 14
It receives vertical pressing force from a and 14b. Further, when pressed by the cylinder 14, the support part 132 comes into contact with the bag body fixing part 11, so that a stable pressing state can be obtained.

The cylinders 14a, 14b are suspended from the fixed plate 140, and each rod 141a, 141b is attached to a pivot portion 142a, 142b relative to the upper surface 131 of the rod pressing portion 13.
connected via.

The pressure medium supply device 15 supplies a pressure medium AR made of, for example, compressed air into the bag body 1° via a supply hose 151 connected to the pressure medium introduction hole 112.

Next, the operation of the above configuration will be explained.

First, a release paper 2, a resin sheet 3, a disc-shaped woven fabric 4, and a release film 5 are laminated on a table 1 in the order shown.

Next, the heating/cooling table 1 is adjusted by a regulator (not shown).
The heating temperature in Step 5 is adjusted to about 150'C. As a result, the resin sheet 3 and the like are heated, and the resin sheet 3 begins to melt.

Here, the center part of the bottom part 101 of the bag body 10 and the disc-shaped woven fabric 4
The bag body 1o is placed on the release film 5 so that the central part of the bag body 1o coincides with the center part of the bag body 1o.

In this state, the pressing cylinders 14a and 14b are operated to apply a vertical pressing force to the rod pressing portion 13. As a result, a compressive force is applied to the compression spring 12g by the central portion 131 of the rod pressing portion 13, and the center rod 12 receives a vertical force via its collar 122a, causing the tip portion 121 of the center rod 12 to move toward the bag body 10. The center part of the disc-shaped woven fabric 4 is pressed through the release film 5.

Next, the pressure medium AR is gradually supplied from the pressure medium supply device 15 to the inside of the bag body 10 .

The bag body 10 gradually begins to expand as the pressure medium AR is supplied. At this time, the center of the bottom 101 of the bag 10 is
It is pressed against the center of the woven fabric 4 by the center rod 12. Therefore, the bag body 10 has the release paper 2, the resin sheet 3,
The composite consisting of the disc-shaped woven fabric 4 and the release film 5 is gradually expanded radially while applying a predetermined tension and pressing force.

As a result, the molten resin is impregnated into the woven fabric, and each fiber of the disc-shaped woven fabric 4 is subjected to uniform tension by the bag body 10 in the radial direction. Therefore, the resin is uniformly impregnated without loosening.

Next, after leaving the bag 10 heated for a predetermined period of time, adjustments (not shown) are carried out while maintaining the internal pressure of the bag 10, that is, with the tension and pressing force of the bag 10 being applied to the entire disc-shaped woven fabric 4. The heating temperature of the table 1 is adjusted to about 50° C. using a heating device.

As the temperature of the table 1 decreases, the temperature of the resin impregnated into the disc-shaped woven fabric 4 decreases and gradually hardens.

In this way, the production of the prepreg sheet is completed.

As explained above, according to this embodiment, uniform tension can be applied to the disk-shaped woven fabric 4 to be impregnated with resin in the radial direction centering on the pressed portion by the center rod 12. It is possible to impregnate the fibers uniformly and to prevent loosening of the fibers. Therefore, a high quality prepreg sheet can be manufactured.

In addition, in this embodiment, the disk-shaped woven fabric 4 was explained as an example, but
It goes without saying that the present invention is not limited to this, and can be applied to various forms of woven fabric, such as rectangular woven fabric.

In addition, in this embodiment, the bag body 1o is provided with a disc-shaped bottom part 101 in advance, but the bag body 1o is not limited to this, and the volume can be increased by supplying the pressure medium AR, for example, like a balloon. The same action and effect as described above can be obtained even by using a material that increases in size and thereby applies tension and pressing force to the woven fabric 4.

(Effects of the Invention) As explained above, according to claim (1), when pressurizing, a part of the elastic bag is pressed against the composite placed on the table, and the inside of the bag is Since the pressure medium is supplied to the woven fabric, a uniform tension can be applied to the woven fabric in the radial direction centering on the pressed portion by the pressing member. Therefore, it is possible to uniformly impregnate the resin, prevent the fibers from loosening, and have the advantage of producing a high-quality prepreg sheet.

Further, according to claim (2), the bag is pressed against the composite from inside the bag so that the centers of the bag and the woven fabric coincide, so that the bag is pressed against the composite material from the inside of the bag. Even when impregnating with resin, uniform tension can be applied in the radial direction over the entire disc-shaped woven fabric, and a high-quality disc-shaped prepreg sheet can be manufactured.

According to claim (3), a bag having elasticity, a pressing member for pressing a part of the bag against a composite placed on a table from approximately the center of the bottom inside the bag, and a pressing member for pressing a part of the bag against a composite placed on a table; Since a pressure medium supply means is provided to supply a pressure medium that spreads the material into the bag, it is possible to easily produce a high-quality prepreg sheet with a uniform degree of resin impregnation over the entire woven fabric and no fiber slack. Moreover, it can be manufactured with high yield.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of a prepreg sheet manufacturing apparatus to which the method of the present invention is applied, Fig. 2 is an explanatory diagram of a prepreg sheet, and Fig. 3 is an explanation of an example of a conventional method for manufacturing a prepreg sheet. It is a diagram. In the figure, 1... table, 2... release paper, 3... resin sheet, 4... disc-shaped woven fabric, 5... release film, 10... bag body, 11...・Bag body fixing part, 12...
Center rod (pressing member), 13... Rod pressing portion, 14a. 14b... Pressing cylinder, 15... Pressure medium supply device (pressure medium supply means). Patent applicant Yokohama Rubber Co., Ltd. Representative Patent Attorney Yoshi 1) Takashi A prepreg sheet BRIBREGLSY-1.

Claims (3)

[Claims] (1) In a method for manufacturing a prepreg sheet, the woven fabric is impregnated with a hot melted resin by heating and pressurizing a composite formed by placing a resin sheet and a woven fabric on top of each other on a table, A method for manufacturing a prepreg sheet, characterized in that during the pressurization, a part of the elastic bag is pressed against the composite, and a pressure medium is supplied into the bag. (2) The method for manufacturing a prepreg sheet according to claim (1), wherein the bag is pressed against the composite material from inside the bag so that the centers of the bag and the woven fabric coincide. (3) In a prepreg sheet manufacturing device that is equipped with a heating table that heats and melts the resin sheet, the composite material formed by overlapping a resin sheet and a woven fabric is arranged, and the resin sheet has an elastic bag; a pressing member that presses a part of the bag against the composite placed on the table from approximately the center of the bottom of the bag, and a pressure medium supply that supplies a pressure medium into the bag that spreads the bag. 1. An apparatus for manufacturing a prepreg sheet, comprising: means.