JP7547742B2 - Manufacturing method of fiber-reinforced substrate, manufacturing method of fiber-reinforced substrate and shutter blade - Google Patents

Description

The present invention relates to a method for manufacturing a fiber-reinforced substrate, and a method for manufacturing a fiber-reinforced substrate and a shutter blade.

Conventional fiber-reinforced substrates are manufactured using prepregs in which unidirectionally oriented carbon fibers are embedded in a thermosetting resin such as epoxy resin (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 6-95202

A method for producing a fiber-reinforced substrate using a thermosetting resin is shown in Fig. 9. A fiber-reinforced substrate 90 is produced by laminating a plurality of prepregs 91 and curing the thermosetting resin by hot pressing.
Since the prepreg 91 containing epoxy resin has tackiness, it is attached to a backing paper 92 and distributed as a strip-shaped laminate 99 protected by a protective film 93 (see FIG. 9( a )).
First, three rectangular laminates 99 are cut out from a strip-shaped laminate 99 (see FIG. 9B).

Next, the protective films 93 are peeled off from the two laminates 99, and the prepregs 91 are bonded together (see FIG. 9(c)). After that, one of the mounts 92 is peeled off to expose the prepreg 91, and the protective film 93 is bonded to the prepreg 91 from the remaining laminate 99 (see FIG. 9(d)).
Next, the backing paper 92 is removed to obtain a laminate 910 in which three prepregs 91 are laminated, and a release film 94 and a press plate 95 are placed on both sides of the laminate in this order to obtain a pressed object 96 (see Figure 9 (e)).

A plurality of such pressed objects 96 (for example, 20 pieces) are stacked together and are collectively heated and pressed by a heat press 97 (see FIG. 9(f)), thereby hardening the thermosetting resin.
Thereafter, the release film 94 and the press plate 95 are removed (see FIG. 9(g)), thereby obtaining a fiber-reinforced substrate 90 (see FIG. 9(h)).
9(b) to (e) are performed manually, which limits the productivity and reduces the positional accuracy when laminating the three prepregs 91.
In the step shown in FIG. 9( f ), the thermal history between the prepregs 91 varies greatly depending on the position in the stacking direction, and warping is likely to occur in the obtained fiber-reinforced substrate 90 .

The present invention has been made in consideration of the above problems, and its purpose is to provide a fiber-reinforced substrate that can efficiently produce fiber-reinforced substrates that are less likely to warp, a method for producing the same, and a method for producing shutter blades that can produce shutter blades with excellent properties.

The exemplary invention of the present application is a method for producing a fiber-reinforced substrate, characterized by having a first step of preparing a first sheet material in which reinforcing fibers oriented in one direction are embedded in a thermoplastic resin and a band-shaped second sheet material containing a thermoplastic resin, a second step of arranging two first sheet materials on both sides of the second sheet material with the orientation direction of the reinforcing fibers aligned, and a third step of passing the second sheet material with the first sheet material arranged on both sides between at least a pair of heating rollers to melt the thermoplastic resin of the first sheet material and the thermoplastic resin of the second sheet material, thereby integrating the two first sheet materials and the second sheet material to obtain a band-shaped fiber-reinforced substrate.

Another exemplary invention of the present application is a band-shaped fiber-reinforced substrate in which oriented reinforcing fibers are embedded in a thermoplastic resin, characterized in that the fiber-reinforced substrate has, along its longitudinal direction, a plurality of thick-walled portions and thin-walled portions located between the thick-walled portions and having a thickness smaller than that of the thick-walled portions.
Another exemplary invention of the present application is a method for producing a shutter blade, comprising the steps of: forming a light-shielding film on a surface of a fiber-reinforced substrate obtained by the fiber-reinforced substrate manufacturing method of the present invention or the fiber-reinforced substrate of the present invention; and processing the fiber-reinforced substrate with the light-shielding film formed thereon into the shape of the shutter blade to obtain the shutter blade.

According to the exemplary invention of this application, it is possible to provide a fiber-reinforced substrate that is less prone to warping. In addition, according to another exemplary invention of this application, it is possible to provide a highly accurate shutter blade.

FIG. 1 is a schematic diagram showing a manufacturing apparatus used in a first embodiment of the method for manufacturing a fiber-reinforced substrate of the present invention. FIG. 2 is a schematic diagram showing a manufacturing apparatus used in a second embodiment of the method for manufacturing a fiber-reinforced substrate of the present invention. FIG. 3 is a cross-sectional view of the fiber-reinforced substrate of the present invention cut along the longitudinal direction. FIG. 4 is a cross-sectional view taken along the longitudinal direction of another example of the configuration of the fiber-reinforced substrate of the present invention. FIG. 5 is a plan view showing two fiber-reinforced substrates having different proportions of thin-walled portions. FIG. 6 is a perspective view showing an example of a shutter blade. FIG. 7 is a schematic plan view showing a shutter assembled using the shutter blades shown in FIG. FIG. 8 is a perspective view showing the mounting structure of the shutter blades shown in FIG. FIG. 9 is a process diagram showing a conventional method for producing a fiber-reinforced substrate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First Embodiment
First, a first embodiment of the method for producing a fiber-reinforced substrate of the present invention will be described.
Fig. 1 is a schematic diagram showing a manufacturing apparatus used in a first embodiment of the method for manufacturing a fiber-reinforced substrate of the present invention. Hereinafter, the upper side in Fig. 1 will be referred to as "upper" or "upper side", and the lower side will be referred to as "lower" or "lower side".

The method for producing a fiber-reinforced substrate according to the first embodiment is carried out using a production apparatus 100 as shown in FIG.
The manufacturing apparatus 100 includes a feed roll 201 around which the belt-shaped second sheet material 2 is wound and which feeds it out, and a take-up roll 202 that winds up the resulting belt-shaped fiber reinforced substrate 3. The manufacturing apparatus 100 also includes an upper feed roll 301 and a lower feed roll 302 around which the belt-shaped first sheet material 1 is wound and which feed it out.
Furthermore, the manufacturing apparatus 100 includes a pair of heating rollers 400 and a pair of cooling rollers 500 disposed in between the second sheet material 2 in the conveying direction of the second sheet material 2. The cooling rollers 500 are disposed downstream of the heating rollers 400 in the conveying direction of the second sheet material 2.

In the first embodiment (as well as in the second embodiment described later), the first sheet material 1 and the second sheet material 2 have the same configuration. Therefore, unless there is any particular distinction between the first sheet material 1 and the second sheet material 2, in this specification, they will be collectively referred to as "sheet material".
The sheet material is constructed by embedding reinforcing fibers oriented in one direction into a thermoplastic resin.

Examples of reinforcing fibers include PAN-based carbon fibers, pitch-based carbon fibers, glass fibers, aramid fibers, ceramic fibers, metal fibers, cellulose fibers, etc. Among these, PAN-based carbon fibers and pitch-based carbon fibers are preferred because of their light weight and high strength.
The average fiber diameter of the reinforcing fibers is preferably about 1 to 20 μm, and more preferably about 5 to 10 μm.

Examples of thermoplastic resins include high-density polyethylene, polypropylene, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyether ketone, polyether ether ketone, polysulfone, polyether sulfone, polyether imide, polyarylate, ionomer, liquid crystal polymer, polyimide, polyamide imide, polyamide, polymethyl methacrylate, etc. Among them, polycarbonate is preferable because it can be sufficiently impregnated into reinforcing fibers and a thin sheet material having excellent impact resistance can be obtained.
Examples of the solvent used when the polycarbonate is impregnated into the reinforcing fibers include ethylene glycol and diethylene glycol.

The method of permeating the thermoplastic resin into the reinforcing fibers is not limited to this, and for example, the thermoplastic resin may be melted and the molten thermoplastic resin may be permeated into the reinforcing fibers. Specifically, a method of impregnating the reinforcing fibers with the thermoplastic resin by laminating a thermoplastic resin film and reinforcing fibers and heating and pressurizing them (film stacking method), a method of attaching a thermoplastic resin powder to the reinforcing fibers and then melting the thermoplastic resin to impregnate the reinforcing fibers (powder method), a method of mixing the thermoplastic resin fibers and the reinforcing fibers and then melting the thermoplastic resin to impregnate the reinforcing fibers (commingled yarn method), a method of covering the reinforcing fibers with thermoplastic resin fibers by braiding technology and then melting the thermoplastic resin to impregnate the reinforcing fibers (micro-braiding method), etc. can be mentioned.
In addition, the weight average molecular weight of the thermoplastic resin is not particularly limited, but is preferably about 8000 to 26000, and more preferably about 10000 to 20000. A thermoplastic resin having such a weight average molecular weight can be more reliably permeated into the reinforcing fibers.

The average thickness of the sheet material is preferably 50 μm or less, and more preferably about 20 to 40 μm. By using a sheet material of such a thickness, a sufficiently thin fiber-reinforced substrate 3 can be obtained.
Such a sheet material does not have tackiness because it contains a thermoplastic resin, not a thermosetting resin, and therefore does not require the attachment of a mount, a protective film, or the like to the sheet material.

In this embodiment, the upper feed roll 301 and the lower feed roll 302 are each configured to convey the first sheet material 1 in a direction perpendicular to the conveying direction of the second sheet material 2. In this way, conveying both the first sheet material 1 and the second sheet material 2 using the feed rolls contributes to automating the manufacturing process of the fiber reinforced substrate 3. Note that this operation can be carried out because the sheet material used in the present invention does not have tackiness.
In this embodiment, the upper delivery roll 301 and the lower delivery roll 302 are disposed on opposite sides of each other with respect to the conveying direction of the second sheet material 2. That is, the conveying direction of the first sheet material 1 conveyed to the upper side of the second sheet material 2 is different from the conveying direction of the first sheet material 1 conveyed to the lower side of the second sheet material 2. This configuration makes it possible to prevent the two first sheet materials 2 from interfering with each other. Also, the degree of freedom in the arrangement of the upper delivery roll 301 and the lower delivery roll 302 is increased.

First, a first sheet material 1 wound around an upper delivery roll 301 and a lower delivery roll 302, respectively, and a second sheet material 2 wound around a delivery roll 201 are prepared (first step).
Next, the second sheet material 2 is fed from the feed roll 201 and conveyed, and the first sheet material 1 is fed from the upper feed roll 301 and the lower feed roll 302. At this time, the two first sheet materials 1 approach the second sheet material 2 from opposite sides centered on the conveying direction of the second sheet material 2, and overlap with the second sheet material 2 to generate an overlapping portion 11. Then, the first sheet material 1 is cut at the end of the overlapping portion 11 on the roll side to separate the overlapping portion 11. As a result, the rectangular first sheet material 1 is arranged on both sides of the second sheet material 2 (second process).

The length of the overlapping portion 11 (length in the conveying direction) may be set to be approximately equal to the width of the second sheet material 2 (length in the direction perpendicular to the conveying direction), or may be set to be longer, but the latter is preferable. The effect of this will be explained later.

In this embodiment, the orientation direction of the reinforcing fibers in the first sheet material 1 and the second sheet material 2 is approximately the same as the longitudinal direction (conveyance direction) of each sheet material. Therefore, in a state where the rectangular first sheet material 1 is arranged on both sides of the second sheet material 2, the orientation direction of the reinforcing fibers of the two first sheet materials 1 is aligned as the short side direction of the obtained fiber-reinforced substrate 3. In other words, the second sheet material 2, in which the orientation direction of the reinforcing fibers is 90°, is interposed between two rectangular first sheet materials 1, in which the orientation direction of the reinforcing fibers is aligned in the 0° direction.
By orthogonally (intersecting) the orientation direction of the reinforcing fibers of the second sheet material 2 with the orientation direction of the reinforcing fibers of the first sheet material 1, it is possible to further improve the mechanical strength of the obtained fiber-reinforced substrate 3. In addition, by making the orientation direction of the reinforcing fibers of the first sheet material 1 the short-side direction of the obtained fiber-reinforced substrate 3, it is possible to prevent the bending rigidity of the fiber-reinforced substrate 3 in the longitudinal direction from becoming too high, and therefore the fiber-reinforced substrate 3 can be reliably wound by the winding roll 202.
The "0° direction" corresponds to the longitudinal direction of the shutter blade 10 produced from the obtained fiber-reinforced substrate 3.

Next, the second sheet material 2 having two rectangular first sheet materials 1 arranged on both sides thereof is passed between a pair of heating rollers 400, and then passed between a pair of cooling rollers 500.
At this time, the first sheet material 1 and the second sheet material 2 are heated and pressed by the pair of heating rollers 400. Then, the thermoplastic resin of the first sheet material 1 and the thermoplastic resin of the second sheet material 2 are melted, and then cooled by the pair of cooling rollers 500 to integrate the two first sheet materials 1 and the second sheet materials 2. In this way, a belt-shaped fiber reinforced substrate 3 is obtained. Note that multiple pairs of heating rollers 400 may be used for melting (heating) the thermoplastic resin, and multiple pairs of cooling rollers 500 may be used for cooling.

When the melting point of the thermoplastic resin is X [° C.], the heating temperature (surface temperature of the heating roller 400) is not particularly limited, but is preferably about X+5 to X+20° C., and more preferably about X+10 to X+15° C. If heating is performed at such a temperature, it is possible to prevent deterioration of the first sheet material 1 and the second sheet material 2 while promoting integration of these.
In addition, in this embodiment, the thickness of the obtained fiber-reinforced substrate 3 is controlled by adjusting the distance between the pair of heating rollers 400. This allows accurate control of the thickness of the fiber-reinforced substrate 3 with a simple configuration.

On the other hand, when the glass transition temperature of the thermoplastic resin is Tg [° C.], the cooling temperature (surface temperature of the cooling roller 500) is preferably about Tg-5 to Tg-20° C., and more preferably about Tg-10 to Tg-15° C. If cooling is performed at such a temperature, crystallization of the thermoplastic resin is promoted, and the mechanical strength of the fiber-reinforced substrate 3 can be further improved.
Moreover, the distance between the pair of cooling rollers 500 is preferably set to be approximately equal to the distance between the pair of heating rollers 400 .
The pair of cooling rollers 500 may be omitted, and the molten thermoplastic resin may be cooled by natural cooling.

Although not shown, a conveying plate or conveying belt is arranged to prevent the rectangular first sheet material 1 arranged below the second sheet material 2 from falling. The conveying plate or conveying belt is configured to pass between the pair of heating rollers 400 and between the pair of cooling rollers 500 together with the first sheet material 1 and the second sheet material 2.
The average thickness of the fiber-reinforced substrate 3 is preferably about 50 to 150 μm, and more preferably about 70 to 120 μm. Therefore, the distance between the pair of heating rollers 400 and the distance between the pair of cooling rollers 500 are set to be approximately the same.
Thereafter, the obtained fiber-reinforced substrate 3 is wound up on a winding roll 202. The peripheral speed of the winding roll 202 is not particularly limited, but is preferably about 0.05 to 5 m/min, and more preferably about 0.1 to 2 m/min. In this case, it is easy to obtain a fiber-reinforced substrate 3 with little distortion.

According to the above-mentioned manufacturing method, since a thermoplastic resin is used for the sheet material, a plurality of sheet materials can be integrated at once. Therefore, it is possible to prevent unevenness in the thermal history in the thickness direction of the obtained fiber-reinforced substrate 3. As a result, it is possible to reduce or prevent the occurrence of warping of the fiber-reinforced substrate 3. In addition, it is also possible to obtain a fiber-reinforced substrate 3 having high surface smoothness.
Furthermore, compared to conventional sheet materials that use thermosetting resins, the sheet material itself does not have tackiness, so processes that were previously performed manually can be automated, dramatically improving the efficiency of manufacturing the fiber-reinforced substrate 3.

Second Embodiment
Next, a second embodiment of the method for producing a fiber-reinforced substrate of the present invention will be described.
2 is a schematic diagram showing a manufacturing apparatus used in a second embodiment of the method for manufacturing a fiber-reinforced substrate of the present invention. Hereinafter, the upper side in FIG. 2 will be referred to as "upper" or "upper side", and the lower side will be referred to as "lower" or "lower side".
Hereinafter, a method for producing a fiber-reinforced substrate according to the second embodiment will be described, focusing on the differences from the method for producing a fiber-reinforced substrate according to the first embodiment described above, and a description of similar points will be omitted.
The manufacturing apparatus 100 used in the second embodiment of the method for producing a fiber-reinforced substrate is similar to the manufacturing apparatus 100 used in the first embodiment of the method for producing a fiber-reinforced substrate described above, except that the upper delivery roll 301 is omitted.

First, a first sheet material 1 wound around a lower delivery roll 302 and a second sheet material 2 wound around a delivery roll 201 are prepared (first step).
Next, the second sheet material 2 is fed and conveyed from the feed roll 201, and the first sheet material 1 is fed and conveyed from the lower feed roll 302. At this time, the first sheet material 1 approaches the second sheet material 2 from the side (the intersecting direction) relative to the second sheet material 2, and then passes further below the second sheet material 2, generating an overlapping portion 11 where the first sheet material 1 overlaps the second sheet material 2, and an excess portion 12 ahead of the overlapping portion 11 in the conveying direction.

Then, the first sheet material 1 is cut at the end of the overlapping portion 11 on the roll side and at the boundary between the overlapping portion 11 and the surplus portion 12, thereby separating the overlapping portion 11 and the surplus portion 12. After that, the surplus portion 12 is inverted to the opposite side of the overlapping portion 11 via the second sheet material 2. As a result, the rectangular first sheet material 1 is arranged on both sides of the second sheet material 2 (second process). The lengths (length in the conveying direction) of the overlapping portion 11 and the surplus portion 12 are set to be approximately equal to the width (length in the direction perpendicular to the conveying direction) of the second sheet material 2.

Next, the second sheet material 2, with two rectangular first sheet materials 1 arranged on both sides, passes between a pair of heating rollers 400, and then passes between a pair of cooling rollers 500.
At this time, the first sheet material 1 and the second sheet material 2 are heated and pressed by the pair of heating rollers 400. Then, the thermoplastic resin of the first sheet material 1 and the thermoplastic resin of the second sheet material 2 are melted, and then cooled by the pair of cooling rollers 500 to integrate the two first sheet materials 1 and the second sheet materials 2. In this way, a belt-shaped fiber reinforced substrate 3 is obtained.
This configuration contributes to automation of the manufacturing process of the fiber-reinforced substrate 3. In addition, since the manufacturing apparatus 100 used in the second embodiment does not include the upper delivery roll 301, the size of the entire apparatus can be reduced.
In addition, since the first sheet material 1 arranged above and below the second sheet material 2 is obtained by cutting the same sheet material, the variation in the basis weight of the reinforcing fiber is approximately the same, so that it is possible to obtain a fiber-reinforced substrate 3 that is less likely to warp.

In this manner, a fiber-reinforced substrate 3 shown in Fig. 3 is obtained. Fig. 3 is a cross-sectional view of the fiber-reinforced substrate of the present invention cut along the longitudinal direction.
The fiber-reinforced substrate 3 shown in Fig. 3 is in the form of a belt, and is configured by embedding oriented reinforcing fibers F in a thermoplastic resin 30. The fiber-reinforced substrate 3 has, along its longitudinal direction, a plurality of thick portions 31 and thin portions 32 located between the thick portions 31 and having a thickness smaller than that of the thick portions 31.
According to this configuration, by cutting the fiber-reinforced substrate 3 along the thin-walled portion 32, a fiber-reinforced substrate 3 of a desired size that is easy to handle in a subsequent process can be obtained.

In addition, the orientation direction of the reinforcing fibers F present near the surface of each thick portion 31 is perpendicular to the orientation direction of the reinforcing fibers F present midway in the thickness direction. This makes it possible to further increase the mechanical strength of the fiber-reinforced substrate 3.
In particular, the reinforcing fibers F present near the surface of each thick portion 31 are oriented in the short direction of the fiber-reinforced substrate 3. This prevents the bending rigidity of the fiber-reinforced substrate 3 in the longitudinal direction from becoming too high, so that the fiber-reinforced substrate 3 can be reliably wound by the winding roll 202 and can also be stably stored in this state.

Depending on the application of the shutter blades processed from the fiber-reinforced base material 3, the second sheet material 2 may not contain the reinforcing fibers F. In other words, the second sheet material 2 may be composed of a simple resin sheet.
In this case, a fiber-reinforced substrate 3 as shown in Fig. 4 is obtained. Fig. 4 is a cross-sectional view of another example of the configuration of a fiber-reinforced substrate of the present invention cut in the longitudinal direction.
In the fiber-reinforced substrate 3 shown in Fig. 4, the reinforcing fibers F are unevenly distributed near the surface of each thick portion 31. With this configuration, the degree of warping of the fiber-reinforced substrate 3 can be adjusted depending on the application of the shutter blade (final product).

After forming a light-shielding film on the surface of the fiber-reinforced substrate 3 manufactured as described above, the fiber-reinforced substrate 3 on which the light-shielding film has been formed is processed into the shape of a shutter blade to obtain a shutter blade. That is, the method for manufacturing a shutter blade of the present invention is characterized by having a step of forming a light-shielding film on the surface of the fiber-reinforced substrate 3 obtained by the method for manufacturing a fiber-reinforced substrate of the present invention or the fiber-reinforced substrate 3 of the present invention, and a step of processing the fiber-reinforced substrate 3 on which the light-shielding film has been formed into the shape of a shutter blade 10 to obtain the shutter blade 10.

According to this method for manufacturing the shutter blades 10, it is possible to obtain the shutter blades 10 with high precision.
The light-shielding film can be formed by using a coating material containing, for example, carbon black, graphite, or the like.
Examples of the processing method include punching, laser processing, water jet processing, and processing using a cutting plotter.

During processing, for example, the fiber-reinforced base material 3 is conveyed to a die at a constant speed and punched (pressed) into the shape of the shutter blade 10 .
5A and 5B are plan views showing two fiber-reinforced substrates having different ratios of thin-walled portions. The fiber-reinforced substrate 3 shown in Fig. 5A has a larger ratio of thin-walled portions 32 than the fiber-reinforced substrate 3 shown in Fig. 5B.
In this case, when the proportion of thin-walled portions 32 is small (see Figure 5 (b)), thin-walled portions 32 that are difficult to process (portions that cannot be used as products) do not frequently appear in the shutter blade 10 when it is transported to the mold, and therefore the processing efficiency of the shutter blade 10 is improved.

Therefore, when manufacturing the fiber-reinforced substrate 3, if the length (length in the conveying direction) of the first sheet material 1 arranged on both sides of the second sheet material 2 is set to be longer than the width (length in the direction perpendicular to the conveying direction) of the second sheet material 2 as described above, the frequency with which thin-walled portions 32 appear in the obtained fiber-reinforced substrate 3 can be reduced. Therefore, the fiber-reinforced substrate 3 shown in FIG. 5(b) is superior to the fiber-reinforced substrate 3 shown in FIG. 5(a) in terms of continuous processability of the shutter blades 10.

Fig. 6 is a perspective view showing an example of a shutter blade. Fig. 7 is a schematic plan view showing a shutter assembled using the shutter blades shown in Fig. 6. Fig. 8 is a perspective view showing an attachment structure of the shutter blades shown in Fig. 6.
The shutter blade 10 shown in FIG. 6 is in the form of a long, thin plate, and has a pair of connection holes 20 for fixing formed at one end thereof.

A rectangular shutter opening 12 (indicated by a dashed line) is provided in the center of a shutter substrate 11 of the shutter shown in FIG.
In a resting state, a front blade group, which is made up of four shutter blades 10 arranged to partially overlap one another, covers a shutter opening 12. Although not shown, a rear blade group is arranged below the front blade group to overlap the front blade group.
The tip of each shutter blade 10 is restricted from unnecessary movement by a blade holder 14 .

A pair of a main arm 15 and a sub arm 16 are supported at the left end of the shutter base plate 11 so as to be rotatable while maintaining a parallel relationship with each other.
Each of the shutter blades 10 constituting the leading blade group is connected at its tip end to a pair of a main arm 15 and a follower arm 16. Each of the shutter blades 10 constituting the trailing blade group is similarly connected to a pair of arms (not shown).
A long hole 17 is provided in the main arm 15, and a long groove 18 is provided in the shutter substrate 11 along a movement trajectory of the long hole 17 accompanying the rotation of the main arm 15. Although not shown, a drive pin that penetrates the shutter substrate 11 via the long groove 18 is connected to the long hole 17.

When a shutter release button (not shown) is pressed, the driving pin moves upward by the biasing force applied along a long groove 18 provided in the shutter base plate 11. In response to this, the main arm 15 connected to the driving pin through a long hole 17 and the follower arm 16 linked thereto rotate upward. This rotation causes each shutter blade 10 constituting the leading blade group to travel vertically upward and open the shutter opening 12.
Next, each shutter blade 10 constituting a rear blade group (not shown) moves vertically to cover the shutter opening 12, thereby completing the exposure.

Here, each shutter blade 10 is connected to a pair of main arms 15 and sub arms 16 by inserting a connecting pin 13 into a corresponding connecting hole 20 via a through hole 19 formed in the main arm 15 and sub arms 16, as shown in FIG.
Here, since each shutter blade 10 is made of a thermoplastic resin, if a groove is formed along the circumferential direction in the pin portion of the connecting pin 13, the area near the connecting hole 20 can be melted and deformed, thereby making it possible to securely fix (connect) the shutter blades 10 to the connecting pin 13.

The fiber-reinforced base material and the manufacturing method thereof, and the manufacturing method of the shutter blades of the present invention have been described above based on the preferred embodiments, but the present invention is not limited to these.
The orientation direction of the reinforcing fibers of the second sheet material 2 is not limited to 90°, and may be about 45 to 135°. That is, in the above embodiment, it is preferable that the orientation direction of the reinforcing fibers of the second sheet material 2 crosses the orientation direction of the reinforcing fibers of the first sheet material 1 in the second step.
Furthermore, the first sheet material 1 may be made to approach the second sheet material 2 from an arbitrary oblique direction. Such an oblique direction may be about 45 to 135 degrees with respect to the conveying direction of the second sheet material 2.

LIST OF SYMBOLS 1 First sheet material 2 Second sheet material 3 Fiber reinforced substrate F Reinforced fiber 30 Thermoplastic resin 31 Thick portion 32 Thin portion 10 Shutter blade 11 Shutter base plate 12 Shutter opening 13 Connecting pin 14 Blade holder 15 Main arm 16 Sub arm 17 Long hole 18 Long groove 19 Through hole 20 Connecting hole 100 Manufacturing device 201 Feed roll 202 Winding roll 301 Upper feed roll 302 Lower feed roll 400 Heating roller 500 Cooling roller 90 Fiber reinforced substrate 91 Prepreg 910 Laminate 92 Mount 93 Protective film 94 Release film 95 Press plate 96 Object to be pressed 97 Heat press machine

Claims (9)

A first step of preparing a first sheet material in which reinforcing fibers oriented in one direction are embedded in a thermoplastic resin, and a band-shaped second sheet material containing a thermoplastic resin;
A second step of arranging two of the first sheet materials on both sides of the second sheet material with the orientation directions of the reinforcing fibers aligned;
and a third step of passing the second sheet material, with the first sheet material disposed on both sides thereof, between at least a pair of heating rollers to melt the thermoplastic resin of the first sheet material and the thermoplastic resin of the second sheet material, thereby integrating the first sheet material and the second sheet material into a strip-shaped fiber-reinforced substrate,
The first sheet material is in a band shape,
In the second step, a first delivery roll is used to deliver one of the first sheet materials in a direction intersecting a delivery direction of the second sheet material, and a second delivery roll is used to deliver the other of the first sheet materials in a direction intersecting a delivery direction of the second sheet material, and an overlapping portion overlapping the second sheet material is separated;
the first delivery roll and the second delivery roll are disposed on opposite sides to each other with respect to a conveying direction of the second sheet material,
A method for manufacturing a fiber-reinforced substrate, characterized in that a conveying direction of the one of the first sheet materials and a conveying direction of the other of the first sheet materials are different from each other. A first step of preparing a first sheet material in which reinforcing fibers oriented in one direction are embedded in a thermoplastic resin, and a band-shaped second sheet material containing a thermoplastic resin;
A second step of arranging two of the first sheet materials on both sides of the second sheet material with the orientation directions of the reinforcing fibers aligned;
and a third step of passing the second sheet material, with the first sheet material disposed on both sides thereof, between at least a pair of heating rollers to melt the thermoplastic resin of the first sheet material and the thermoplastic resin of the second sheet material, thereby integrating the first sheet material and the second sheet material into a strip-shaped fiber-reinforced substrate,
The first sheet material is in a band shape,
A method for manufacturing a fiber-reinforced substrate, characterized in that in the second step, one of the first sheet materials is transported in a direction intersecting the transport direction of the second sheet material, the second sheet material is passed through, an overlapping portion overlapping the second sheet material and a surplus portion forward of the overlapping portion in the transport direction are generated, the overlapping portion and the surplus portion are separated, and then the surplus portion is inverted to the opposite side of the overlapping portion via the second sheet material. The second sheet material further contains reinforcing fibers embedded in the thermoplastic resin and oriented in one direction,
3. The method for producing a fiber-reinforced substrate according to claim 1, wherein in the second step, an orientation direction of the reinforcing fibers of the second sheet material is made to cross an orientation direction of the reinforcing fibers of the first sheet material. The method for producing a fiber-reinforced substrate according to any one of claims 1 to 3, wherein in the second step, the orientation direction of the reinforcing fibers of the first sheet material is set to the short side direction of the resulting fiber-reinforced substrate. The method for producing a fiber-reinforced substrate according to any one of claims 1 to 4, wherein in the third step, the thickness of the obtained fiber-reinforced substrate is controlled by adjusting the distance between the at least one pair of heating rollers. A band-shaped fiber-reinforced substrate in which oriented reinforcing fibers are embedded in a thermoplastic resin,
Along the longitudinal direction of the fiber reinforced base material, there are a plurality of thick portions and thin portions located between the thick portions and having a thickness smaller than that of the thick portions,
The width of each of the thick portions in the longitudinal direction is longer than the width of each of the thick portions in the lateral direction of the fiber reinforced substrate,
A fiber-reinforced substrate, characterized in that the orientation direction of the reinforcing fibers present near the surface of each of the thick portions intersects with the orientation direction of the reinforcing fibers present midway through the thickness direction . The fiber-reinforced substrate according to claim 6, wherein the reinforcing fibers are unevenly distributed near the surface of each of the thick portions. The fiber-reinforced substrate according to claim 6 or 7 , wherein the reinforcing fibers present in the vicinity of a surface of each of the thick portions are oriented in a short-side direction of the fiber-reinforced substrate. 1. A method for manufacturing a shutter blade, comprising the steps of:
A step of forming a light-shielding film on a surface of a fiber-reinforced substrate obtained by the method for producing a fiber-reinforced substrate according to any one of claims 1 to 5 or the fiber-reinforced substrate according to any one of claims 6 to 8 ;
and processing the fiber-reinforced base material on which the light-shielding film is formed into a shape of the shutter blade to obtain the shutter blade.

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