JP7268707B2 - REINFORCED FIBER PACKAGE AND METHOD FOR MANUFACTURING REINFORCED FIBER PACKAGE - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reinforcing fiber package and a method for manufacturing a reinforcing fiber package.

In various fields such as sports and leisure applications, industrial applications such as automobiles and aircraft, and housing applications for electrical and electronic equipment and home appliances, reinforced fibers are impregnated with matrix resin due to their light weight, high strength, and high rigidity. fiber reinforced composite materials are widely used. When reinforcing fibers such as glass fibers and carbon fibers are produced, usually, a plurality of reinforcing fibers are bundled to form a reinforcing fiber bundle, and after the reinforcing fiber bundle is wound on a paper tube or the like, a packaging material is used. packaged in

For example, a reinforcing fiber package is known in which a cylindrical body obtained by cylindrically winding a long reinforcing fiber bundle around a paper tube is wrapped using a heat-shrinkable film (for example, Patent Documents 1 to 3 ). When the reinforcing fiber package is used, generally, the end of the reinforcing fiber bundle of an arbitrary package on the inner peripheral surface side and the end of the reinforcing fiber bundle of another package on the outer peripheral surface side are arranged in series. It is connected so as to connect to the , and is used while being pulled out continuously.

However, in a reinforcing fiber package wrapped with a heat-shrinkable film, if the end of the tubular body in the reinforcing fiber bundle on the outer peripheral side is positioned on the outer peripheral surface, when pulling out the end, the tubular body It is necessary to break the heat-shrinkable film on the outer peripheral surface. When the heat-shrinkable film on the outer peripheral surface of the cylindrical body is broken, especially when the reinforcing fiber bundles are pulled out from the end of the inner peripheral side of the cylindrical body for use, the remaining amount of the reinforcing fiber bundles becomes small. The cylindrically wound reinforcing fiber bundle loses its shape and becomes easily entangled.

In Patent Document 4, a tubular body is heat-shrinkable in a state in which the ends on the inner peripheral surface side and the outer peripheral surface side of the tubular body in the reinforcing fiber bundle are pulled out to the upper end surface side of the tubular body. A film-wrapped reinforcing fiber package is described.

JP-A-10-212070 Japanese Utility Model Publication No. 48-38016 JP-A-2000-85724 JP-A-47-19123

In the reinforcing fiber package of Patent Document 4, the reinforcing fiber bundles of a plurality of packages are connected in series without breaking the heat-shrinkable film on the outer peripheral surface of the cylindrical body, and the reinforcing fiber bundles are continuously pulled out and used. can do. Therefore, compared with the case where the heat-shrinkable film on the outer peripheral surface of the cylindrical body is broken, the reinforcing fiber bundle is less likely to lose its shape when the remaining amount of the reinforcing fiber bundle is reduced after being pulled out.
However, if the end of the reinforcing fiber bundle is pulled out when it is packaged, the pulled-out portion of the reinforcing fiber bundle tends to interfere with handling of the reinforcing fiber package, resulting in poor handling.

In the present invention, the reinforcing fiber bundle can be used without breaking the heat-shrinkable film on the outer peripheral surface of the cylindrical body, the reinforcing fiber bundle is less likely to lose its shape and get tangled when pulled out, and the package is excellent in handleability. a package containing the reinforcing fiber package; a method for connecting and cutting reinforcing fiber bundles using the reinforcing fiber package; and a method for producing a fiber-reinforced composite material.

The present invention has the following configurations.
[1] A reinforcing fiber package in which at least the outer peripheral surface of a cylindrical body in which reinforcing fiber bundles are wound in a cylindrical shape is covered with a heat-shrinkable film, and the heat-shrinkable film is heat-shrunk and closely adheres to the outer peripheral surface. The reinforcing fiber bundle has a first end on the outer peripheral surface side and a second end on the inner peripheral surface side of the cylindrical body, and the reinforcing fiber bundle is closer to the first end. A fiber reinforced package, wherein a portion is located on an end face of said tubular body, and said first end is located between said outer peripheral face and said heat-shrinkable film.
[2] A portion of the reinforcing fiber bundle disposed on the end face on the first end side is within 50 cm from the first end and has a length of 3 cm or more, [1] The reinforcing fiber package described in .
[3] A reinforcing fiber package in which the outer peripheral surface of a cylindrical body in which a reinforcing fiber bundle is wound in a cylindrical shape is covered with a heat-shrinkable film, and the heat-shrinkable film is heat-shrunk to adhere to the outer peripheral surface. The reinforcing fiber bundle has a first end on the outer peripheral surface side and a second end on the inner peripheral surface side of the cylindrical body, and the reinforcing fiber bundle is closer to the first end. is on one end face of the tubular body, and the heat-shrinkable film is also in close contact with the end face of the tubular body where the first end-side portion is located, and the first end-side portion is located between the end surface of the tubular body and the heat-shrinkable film, and the first end is located inside the tube of the tubular body.
[4] The reinforcing fiber package according to any one of [1] to [3], wherein the reinforcing fiber bundle has a flat shape with a ratio B/A of width B to thickness A of 20 or more.
[5] A packaged article comprising a box and a plurality of reinforcing fiber packages of any one of [1] to [4] housed in the box.
[6] The first end of an arbitrary reinforcing fiber package and the second end of a different reinforcing fiber package are connected while the heat-shrinkable film is in close contact with the outer peripheral surface of the cylindrical body. , the package storage item according to [5], wherein the reinforcing fiber bundles of the reinforcing fiber packages are connected in series.
[7] The box comprises a storage body for storing the plurality of reinforcing fiber packages with one end surface facing upward, and a top lid closing an upper end opening of the storage body, wherein the top lid includes each A plurality of openings corresponding to the reinforcing fiber packages are formed such that the first end of any reinforcing fiber package and the second end of a different reinforcing fiber package are aligned with the reinforcing fibers of the reinforcing fiber packages. The package storage item according to [5], wherein the bundles are connected in a state in which the reinforcing fiber bundles are passed through the respective openings so that the bundles are connected in series.
[8] A plurality of reinforcing fiber packages according to any one of [1] to [4] are arranged, and the first end of any reinforcing fiber package and the second end of another reinforcing fiber package and a method for connecting the reinforcing fiber bundles so that the reinforcing fiber bundles of the reinforcing fiber packages are connected in series, wherein a portion of the reinforcing fiber bundle disposed on the end face on the first end side is grasped. The first end of the reinforcing fiber bundle is pulled out while the heat-shrinkable film is in close contact with the outer peripheral surface of the cylindrical body, and the first end of the reinforcing fiber bundle and another reinforcing fiber are pulled out. A method for connecting reinforcing fiber bundles, wherein the bundles are connected to the second ends.
[9] Pressurized air is blown onto the first end of the reinforcing fiber package and the second end of the other reinforcing fiber package in a state where they are superimposed on each other to The method for connecting reinforcing fiber bundles according to [8], wherein the reinforcing fiber bundles are connected by intertwining them.
[10] A reinforcing fiber bundle is pulled out from the reinforcing fiber package according to any one of [1] to [4] or the reinforcing fiber package in the package storage item according to any one of [5] to [7], A method for cutting a reinforcing fiber bundle, comprising cutting with a cutter.
[11] A pulling step of pulling out the reinforcing fiber bundle from the reinforcing fiber package according to any one of [1] to [4] or from the reinforcing fiber package in the packaged object according to any one of [5] to [7]. and a resin impregnation step of impregnating the pulled-out reinforcing fiber bundle with a resin composition.

In the reinforcing fiber package of the present invention, the reinforcing fiber bundle can be used without breaking the heat-shrinkable film on the outer peripheral surface of the cylindrical body, the reinforcing fiber bundle is difficult to lose shape and tangle when pulled out, and the package is Easy to handle.
In the packaged object of the present invention, the reinforcing fiber bundle can be used without breaking the heat-shrinkable film on the outer peripheral surface of the tubular body in the reinforcing fiber package, and the reinforcing fiber bundle loses its shape and is less likely to get entangled when pulled out. , and the package is easy to handle.
According to the method for connecting and cutting reinforcing fiber bundles of the present invention, it is possible to prevent the reinforcing fiber bundles from losing their shape and becoming entangled while ensuring the handleability of the package.
According to the method for producing a fiber-reinforced composite material of the present invention, it is possible to stably produce a fiber-reinforced composite material by suppressing the reinforcing fiber bundles from losing their shape and becoming entangled while ensuring the handleability of the package.

1 is a perspective view showing an example of a reinforcing fiber package of the present invention; FIG. FIG. 2 is a perspective view showing a state in which a support is removed from the reinforcing fiber package of FIG. 1; FIG. 3 is a perspective view showing a state in which a first end and a second end of a reinforcing fiber bundle are pulled out from the reinforcing fiber package of FIG. 2; FIG. 4 is a perspective view showing a state in which a first end of a reinforcing fiber bundle in an arbitrary reinforcing fiber package and a second end of a reinforcing fiber bundle in a different reinforcing fiber package are connected in series; 1 is a perspective view showing an example of a package storage item of the present invention; FIG. FIG. 6 is a perspective view showing how the reinforcing fiber bundle in the package storage of FIG. 5 is pulled out; FIG. 4 is a perspective view showing another example of the reinforcing fiber package of the present invention; FIG. 8 is a cross-sectional view of the reinforcing fiber package of FIG. 7 taken along line AA; FIG. 3 is a perspective view showing a cylindrical body produced in Examples. FIG. 10 is a perspective view showing how a heat-shrinkable film is wound around the cylindrical body of FIG. 9 in Example 1; FIG. 10 is a perspective view showing how a heat-shrinkable film is wound around the cylindrical body of FIG. 9 in Example 2; FIG. 10 is a perspective view showing how a heat-shrinkable film is wound around the cylindrical body of FIG. 9 in Comparative Example 1;

In this specification, the term "upper end face" means an end face facing upward when the cylindrical body is placed with its axial direction vertical during use. Also, the “lower end surface” means the end surface on the opposite side of the upper end surface.

[Reinforcing fiber package]
The reinforcing fiber package of the present invention is a package in which at least the outer peripheral surface of a cylindrical body formed by winding reinforcing fiber bundles in a cylindrical shape is covered with a heat-shrinkable film.

(First embodiment)
An example of the first embodiment of the reinforcing fiber package of the present invention will be described below with reference to FIGS. 1 to 3. FIG.
As shown in FIG. 1, the reinforcing fiber package 1 of this embodiment includes a cylindrical support 10, a cylindrical body 14 formed by cylindrically winding a reinforcing fiber bundle 12 around the support 10, and a cylindrical body and a heat-shrinkable film 16 covering the outer peripheral surface 14a, the upper end surface 14b and the lower end surface 14c of 14 .

As the support 10, a known support that is used when winding a reinforcing fiber bundle can be used, and examples thereof include a paper tube, a resin tube (thermoplastic resin, thermosetting resin), and the like.
The support around which the reinforcing fiber bundles are wound is not limited to a cylindrical shape, and may be, for example, a prismatic shape, a columnar shape, a prismatic shape, or the like.
A cylindrical paper tube is preferable as the support 10 .

When the reinforcing fiber bundle 12 is pulled out from the inner peripheral surface side of the cylindrical body 14 for use, the supporting body 10 is pulled out from the cylindrical body 14 as shown in FIG. Therefore, it is preferable that the support 10 be easily pulled out from the cylindrical body 14 . From this point of view, as the support 10, a paper tube suitable for so-called center pull, which has a cylindrical shape and has grooves or perforations continuous in the axial direction, is particularly preferable.

The heat-shrinkable film 16 is a packaging material for wrapping the cylindrical body 14, and is heat-shrunk while covering the outer peripheral surface 14a of the cylindrical body 14 and part of the outer edge side of the upper end surface 14b and the lower end surface 14c. As a result, the outer peripheral surface 14a, the upper end surface 14b, and the lower end surface 14c of the cylindrical body 14 are in close contact with each other. In this example, portions of the upper end surface 14b and the lower end surface 14c of the cylindrical body 14 near the support 10 are exposed.

As the heat-shrinkable film 16, a known heat-shrinkable film used for packaging articles can be used. Examples include polyethylene film, polypropylene film, polyvinyl chloride film, polyvinylidene chloride film, polystyrene film, and polyamide film.

As the heat-shrinkable film 16, one having high adhesion to the reinforcing fiber bundles 12 is preferable. As a result, when the reinforcing fiber bundle 12 is pulled out and used, even if the remaining amount of the reinforcing fiber bundle 12 is small, the reinforcing fiber bundle 12 is in close contact with the heat-shrinkable film 16, so that the reinforcing fiber bundle 12 does not easily lose its shape.
It is preferable that the heat-shrinkable film 16 can maintain a self-sustaining state even when all the reinforcing fiber bundles 12 forming the cylindrical body 14 are pulled out. As a result, when the reinforcing fiber bundle 12 is pulled out and used, the reinforcing fiber bundle 12 is less likely to lose its shape.
For example, when the reinforcing fibers forming the reinforcing fiber bundle 12 are carbon fibers, polymer films such as polyethylene, polyvinyl chloride, polyethylene terephthalate, and nylon can be suitably used as the heat-shrinkable film 16 . In particular, polyethylene films and polyvinyl chloride films having a thickness of 10 μm or more are more preferable from the standpoint of self-supporting properties.

As shown in FIGS. 1 to 3, the reinforcing fiber bundle 12 has a first end 12a on the outer peripheral surface 14a side of the tubular body 14 and a second end 12b on the inner peripheral surface side of the tubular body 14. are doing. The reinforcing fiber bundle 12 is formed by bundling continuous reinforcing fibers from a first end 12a to a second end 12b.

As shown in FIG. 1, the reinforcing fiber bundle 12 is positioned between the outer peripheral surface 14a of the tubular body 14 and the heat-shrinkable film 16, and the reinforcing fiber bundle 12 is positioned near the first end 12a. The portion 12c is arranged on the upper end surface 14b of the cylindrical body 14. As shown in FIG.
Since the first end 12a of the reinforcing fiber bundle 12 is housed between the outer peripheral surface 14a of the cylindrical body 14 and the heat-shrinkable film 16, the reinforcing fiber bundle 12 does not interfere with the transportation of the reinforcing fiber package 1. The reinforcing fiber package 1 is excellent in handleability. In addition, since the portion 12c of the reinforcing fiber bundle 12 near the first end 12a is arranged on the upper end surface 14b of the tubular body 14, as shown in FIG. The first end 12a of the reinforcing fiber bundle 12 can be pulled out without breaking the heat-shrinkable film 16. As shown in FIG. Therefore, when the reinforcing fiber bundle 12 is pulled out from the second end 12b and used, even if the remaining amount of the reinforcing fiber bundle 12 is small, the reinforcing fiber bundle 12 on the outer peripheral surface 14a side of the cylindrical body 14 is heat-shrinkable. Since it is in close contact with the film 16, it is difficult to lose its shape. This can prevent the reinforcing fiber bundles 12 from becoming entangled during use.

In this example, a portion 12c of the reinforcing fiber bundle 12 near the first end 12a is partially exposed from the edge of the heat-shrinkable film 16 on the support 10 side. Thereby, the portion 12c of the reinforcing fiber bundle 12 can be grasped and the first end 12a can be easily pulled out without breaking the portion of the heat-shrinkable film 16 covering the upper end surface 14b of the tubular body 14.

In the reinforcing fiber package of the first embodiment, the portion of the reinforcing fiber bundle disposed on the upper end surface of the cylindrical body is entirely covered with a heat-shrinkable film as long as the effects of the present invention are not impaired. may For example, the portion 12c of the reinforcing fiber bundle 12 arranged on the upper end surface 14b of the cylindrical body 14 may be entirely covered with the heat-shrinkable film 16. In this case, for example, the portion of the heat-shrinkable film 16 covering the upper end surface 14b of the tubular body 14 is assisted in breaking such that the portion covering the outer peripheral surface 14a of the tubular body 14 is not broken. , a form of forming a circular perforation line can be adopted. In this embodiment, the portion of the heat-shrinkable film 16 covering the upper end surface 14b of the tubular body 14 is partially cut off along the perforation line, and the portion of the reinforcing fiber bundle 12 disposed on the upper end surface 14b of the tubular body 14 is cut off. 12c can be exposed. As a result, the first ends 12a of the reinforcing fiber bundles 12 can be pulled out without breaking the heat-shrinkable film 16 on the outer peripheral surface 14a of the tubular body 14 .

The portion 12c arranged on the upper end surface 14b of the cylindrical body 14 on the side of the first end 12a of the reinforcing fiber bundle 12 is within 50 cm from the first end, and the length of the portion 12c is 3 cm or more. is preferred. This makes it easier to grasp the portion 12c of the reinforcing fiber bundle 12 on the upper end surface 14b of the cylindrical body 14 and pull out the first end 12a.
In addition, the fact that the portion of the reinforcing fiber bundle disposed on the upper end surface of the cylindrical body is within 50 cm from the first end means that the portion of the reinforcing fiber bundle that is the furthest from the first end. , means that the distance from the first end is 50 cm or less.

It is easy to pull out the first end 12a, and when the first end 12a is pulled out, the reinforcing fiber bundles from the first end 12a to the portion 12c are pulled out from the other portions. In order to reduce the possibility of damage, the portion 12c of the reinforcing fiber bundle 12 placed on the upper end surface 14b of the cylindrical body 14 is preferably within 50 cm from the first end, and within 35 cm from the first end. and more preferably within 25 cm from the first end.
During the work of storing the reinforcing fiber package 1 in a box or the work of transporting the stored package contents, the first end 12a is unintentionally damaged by the heat-shrinkable film 16 and the outer peripheral surface 14a of the cylindrical body 14. The portion 12c of the reinforcing fiber bundle 12 placed on the upper end surface 14b of the cylindrical body 14 is preferably separated from the first end 12a by 4 cm or more in order to prevent the portion 12c of the reinforcing fiber bundle 12 from being exposed to the outside. Preferably, it is more preferably separated by 8 cm or more.

The length of the portion 12c of the reinforcing fiber bundle 12 arranged on the upper end surface 14b of the cylindrical body 14 is preferably 3 cm or more, more preferably 5 cm or more, in order to facilitate the pulling out of the first end 12a. 7 cm or more is more preferable. Although there is no upper limit to the length of the portion 12c of the reinforcing fiber bundle 12, it is preferably 30 cm or less, and 20 cm or less in order to prevent it from getting entangled in the box and being caught during the work of storing it in the box. It is more preferable to have

The reinforcing fiber bundle 12 is preferably flat with a ratio B/A of width B to thickness A of 20 or more.
Since the reinforcing fiber bundles 12 are in such a flat shape, unevenness of the outer peripheral surface 14a of the tubular body 14 is reduced, and the reinforcing fiber bundles 12 and the heat-shrinkable film 16 positioned on the outer peripheral surface 14a of the tubular body 14 are reduced. Adhesion with is more excellent. Therefore, when the reinforcing fiber bundle 12 is pulled out from the second end 12b and used, the reinforcing fiber bundle 12 is less likely to lose its shape even if the remaining amount of the reinforcing fiber bundle 12 is small.
Further, for example, compared to the case where the cross section of the reinforcing fiber bundle 12 is circular, if the reinforcing fiber bundle 12 is flat, force is locally applied to the reinforcing fiber bundles 12 that are in contact with each other in the wound state. Also, when the reinforcing fiber bundles 12 are pulled out, they are less likely to get caught on each other. Therefore, the physical properties of the reinforcing fiber bundle 12 are less likely to deteriorate during storage, and the reinforcing fiber bundle 12 is less likely to be damaged during winding or take-off.

The ratio B/A is preferably 20 or more, more preferably 30 or more, and 40 or more, because the adhesion between the reinforcing fiber bundle 12 and the heat-shrinkable film 16 is excellent and the reinforcing fiber bundle 12 does not easily lose its shape. More preferred. The ratio B/A is preferably 100 or less, more preferably 85 or less, and even more preferably 70 or less, from the viewpoint of preventing the ends of the tow from becoming fuzzy due to excessive thinning of the tow.

The cross-sectional shape of the reinforcing fiber bundle 12 taken along a plane perpendicular to the fiber axis is not particularly limited, and may be rectangular or elliptical, for example.

As the reinforcing fibers forming the reinforcing fiber bundle 12, known reinforcing fibers used for fiber-reinforced composite materials can be employed. Reinforcing fibers include, for example, inorganic fibers, organic fibers, metal fibers, and hybrid reinforcing fibers combining these fibers.
Examples of inorganic fibers include carbon fibers, graphite fibers, silicon carbide fibers, alumina fibers, tungsten carbide fibers, boron fibers, and glass fibers. Examples of organic fibers include aramid fibers, high-density polyethylene fibers, general nylon fibers, polyester fibers, and the like. Examples of metal fibers include fibers of stainless steel, iron, and the like, and carbon fibers coated with metal may also be used.
Among them, carbon fiber is preferable as the reinforcing fiber.

The diameter and number of the reinforcing fibers forming the reinforcing fiber bundle 12 are not particularly limited. Normally, the reinforcing fibers have a diameter of about 3 to 100 μm and a number of about 1,000 to 100,000.
The "diameter of the reinforcing fiber" means the equivalent circular diameter of the cross section of the reinforcing fiber (that is, the diameter of a circle having the same area as the projected area of the cross section of the reinforcing fiber).

The use of the reinforcing fiber package of the present invention is not particularly limited. It can be used for the production of chops, etc.

(Second embodiment)
An example of a second embodiment of the reinforcing fiber package of the present invention will be described below with reference to FIGS. 7 and 8. FIG. 7 that are the same as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIGS. 7 and 8, the reinforcing fiber package 2 of this embodiment includes a cylindrical support 10, a cylindrical body 14 formed by cylindrically winding a reinforcing fiber bundle 12 around the support 10, A heat-shrinkable film 16A covering the outer peripheral surface 14a of the cylindrical body 14 and the upper end surface 14b of the reinforcing fiber bundle 12 having the first end 12a.

The heat-shrinkable film 16A is a packaging material for packaging the cylindrical body 14. As shown in FIG. The heat-shrinkable film 16A is thermally shrunk while covering the outer peripheral surface 14a and the upper end surface 14b of the tubular body 14, thereby covering the outer peripheral surface 14a and the upper end surface 14b of the tubular body 14. is closely related to The lower end surface 14c may or may not be covered with the heat-shrinkable film 16A. In the reinforcing fiber package 2, the reinforcing fiber bundles 12 are all covered with the heat-shrinkable film 16A and are not exposed to the outside. As a result, the reinforcing fiber bundle 12 is less likely to become an obstacle during transportation, etc., and the reinforcing fiber package 2 is excellent in handleability.
As the heat-shrinkable film 16A, the same heat-shrinkable film 16 as in the first embodiment can be used, and preferred aspects are also the same.

In the reinforcing fiber package 2, the portion 12c near the first end 12a of the reinforcing fiber bundle 12 is located between the upper end surface 14b of the cylindrical body 14 and the heat-shrinkable film 16A, and is located inside the support 10 . That is, the portion 12c near the first end 12a of the reinforcing fiber bundle 12 is positioned between the upper end surface 14b of the cylindrical body 14 and the heat-shrinkable film 16A, and the first end 12a of the reinforcing fiber bundle 12 is located between the cylindrical body 14 and the heat-shrinkable film 16A. It is positioned inside the cylinder of the shaped body 14 .
Thus, if only the portion of the heat-shrinkable film 16A above the upper end surface 14b of the cylindrical body 14 is broken, the portion 12c of the reinforcing fiber bundle 12 can be grasped and the first end 12a can be pulled out. That is, the first ends 12a of the reinforcing fiber bundles 12 can be pulled out without breaking the portion of the heat-shrinkable film 16A on the outer peripheral surface 14a of the cylindrical body 14. FIG. Therefore, when the reinforcing fiber bundle 12 is pulled out from the second end 12b and used, even if the remaining amount of the reinforcing fiber bundle 12 is small, the reinforcing fiber bundle 12 on the outer peripheral surface 14a side of the cylindrical body 14 is heat-shrinkable. Since it is in close contact with the film 16A, it is difficult to lose its shape. This can prevent the reinforcing fiber bundles 12 from becoming entangled during use.

In the reinforcing fiber package 2, the upper end surface 14b of the cylindrical body 14 is covered with the heat-shrinkable film 16A while the portion 12c of the reinforcing fiber bundle 12 is located on the upper end surface 14b of the cylindrical body 14. Therefore, the portion 12c of the reinforcing fiber bundle 12 is difficult to move. Therefore, during use, it is easy to stably grasp the portion 12c of the reinforcing fiber bundle 12 and pull out the first end 12a.

As described above, in the reinforcing fiber package of the present invention, the reinforcing fiber bundle is used without breaking the heat-shrinkable film on the outer peripheral surface of the tubular body while making the reinforcing fiber package excellent in handleability. It is possible to prevent the reinforcing fiber bundle from losing its shape and becoming entangled when it is pulled out.

Note that the reinforcing fiber package of the present invention is not limited to the reinforcing fiber packages 1 and 2 described above. For example, although the reinforcing fiber packages 1 and 2 were provided with the support 10, the reinforcing fiber package of the present invention may not be provided with the support.
For example, in the case where the reinforcing fiber package can be installed so that the first end can be pulled out from the lower end surface of the tubular body, the first end of the reinforcing fiber bundle is between the outer peripheral surface of the tubular body and the heat-shrinkable film. The portion closer to the first terminal end may be arranged on the lower end surface of the cylindrical body in the state of being positioned at the position of . Further, the first end portion of the reinforcing fiber bundle may be located inside the tubular body, and the portion closer to the first end may be arranged on the lower end surface of the tubular body. In this case, the lower end surface 14c may be covered with the heat-shrinkable film A.

[Method for connecting reinforcing fiber bundles]
Hereinafter, a method for connecting the reinforcing fiber bundles 12 of the reinforcing fiber package 1 will be described as a method for connecting the reinforcing fiber bundles of the present invention.
The reinforcing fiber packages 1 can be used, for example, in a state in which a plurality of reinforcing fiber packages 1 are arranged and the reinforcing fiber bundles 12 of the reinforcing fiber packages 1 are connected in series. Specifically, as shown in FIG. 4, a first end 12a of a reinforcing fiber bundle 12 in an arbitrary reinforcing fiber package 1 and a second end 12b of a reinforcing fiber bundle 12 in a different reinforcing fiber package 1 and can be used so that the reinforcing fiber bundles 12 are connected in series. As a result, since the longer reinforcing fiber bundles 12 can be continuously drawn out and used, there is no need to replace the reinforcing fiber package 1 every time the reinforcing fiber bundles 12 run out, and the fiber-reinforced composite material can be manufactured more efficiently. can be done.

When connecting the reinforcing fiber bundles 12 of a plurality of reinforcing fiber packages 1, first, the first end 12a and the second end 12b of each reinforcing fiber package 1 are pulled out. Specifically, as shown in FIG. 2, the support 10 is pulled out from the cylindrical body 14, and as shown in FIG. Also, the portion 12c located on the upper end surface 14b of the tubular body 14 on the side of the first end 12a of the reinforcing fiber bundle 12 is grasped, and as shown in FIG. The first end 12a of the reinforcing fiber bundle 12 is pulled out while the film 16 is kept in close contact.
Next, as shown in FIG. 4, the first ends 12a of the reinforcing fiber bundles 12 in the reinforcing fiber package 1 and the second ends 12b of the reinforcing fiber bundles 12 in a different reinforcing fiber package 1 are separated from each other. The connecting portion 18 is formed by connecting the reinforcing fiber bundles 12 so as to be connected in series.

When pulling out the first end 12a of the reinforcing fiber bundle 12 to the outside of the heat-shrinkable film 16, it is preferable to pull out 30 cm or more from the first end 12a of the reinforcing fiber bundle 12, and more preferably 50 cm or more. preferable. This facilitates the work of connecting the first end 12a of the reinforcing fiber bundle 12 and the second end 12b of another reinforcing fiber bundle 12 .

As a method for connecting the first ends 12a and the second ends 12b of the reinforcing fiber bundles 12, the first ends 12a and the second ends 12b of the reinforcing fiber bundles 12 are overlapped. A preferred method is so-called air splicing, in which pressurized air is blown to the portion to entangle and connect the reinforcing fibers. In this method, the first end and the second end of the reinforcing fiber bundles are sufficiently connected to each other while preventing troubles in the process of using the reinforcing fiber bundles by preventing the cross-sectional area of the connecting portion from becoming excessively large. It is advantageous in that it can be connected with sufficient strength.
As a method for connecting the first end 12a and the second end 12b of the reinforcing fiber bundles 12, a method using an adhesive, a method using an adhesive tape, and a method for tying the ends together are adopted. You may

When using the reinforcing fiber package 2, after pulling out the first ends 12a, the first ends 12a and the second ends 12b of the reinforcing fiber bundles 12 are pulled out in the same manner as in the case of the reinforcing fiber package 1. can be connected. Between the reinforcing fiber package 1 and the reinforcing fiber package 2, the first ends 12a and the second ends 12b of the reinforcing fiber bundles 12 may be connected.

According to the connection method of the present invention described above, the first end of the reinforcing fiber bundle is pulled out without breaking the heat-shrinkable film on the outer peripheral surface of the tubular body in the reinforcing fiber package of the present invention, and is separated from it. It can be connected with a second end of a reinforcing fiber bundle in another reinforcing fiber package. Therefore, when the connected reinforcing fiber bundles are pulled out and used, it is possible to prevent the reinforcing fiber bundles from losing their shape and becoming entangled.

[Method for cutting reinforcing fiber bundle]
The method for cutting the reinforcing fiber bundle of the present invention is a method of drawing out the reinforcing fiber bundle from the reinforcing fiber package of the present invention and cutting it with a rotary cutter, for example, in the case of manufacturing SMC.
For example, as described above, in a state where the first end 12a of any reinforcing fiber package 1 or reinforcing fiber package 2 is connected to the second end 12b of another reinforcing fiber package 1 or reinforcing fiber package 2, , the longer reinforcing fiber bundle 12 can be continuously pulled out and cut by a rotary cutter.
In the case of a reinforcing fiber package housed in a box body of a package housing item to be described later, the cutting work can be performed in the same manner.

In the method for cutting a reinforcing fiber bundle of the present invention, the reinforcing fiber bundle can be pulled out and cut for use without breaking the heat-shrinkable film on the outer peripheral surface of the cylindrical body in the reinforcing fiber package of the present invention. . As a result, it is possible to suppress the entanglement of the drawn out reinforcing fiber bundles due to deformation, so that the cutting operation can be stably performed.

[Package storage items]
A packaged article of the present invention is a box containing a plurality of reinforcing fiber packages of the present invention. An example of the package of the present invention will be described below with reference to FIGS. 5 and 6. FIG.

As shown in FIG. 5, the package 100 of this embodiment includes a box 20 and six reinforcing fiber packages 1 housed in the box 20. As shown in FIG.
The box 20 of this example includes a storage body 22 and an upper lid 24 that closes the top opening of the storage body 22 .

The storage main body 22 includes a bottom portion 26 having a rectangular shape in a plan view and side portions 28 rising from the peripheral portion of the bottom portion 26, and each reinforcing fiber package 1 is placed therein so that the upper end surface 14b of the cylindrical body 14 is upward. It can be stored so that it faces the

The shape and size of the storage main body 22 may be appropriately set according to the shape, size, number, arrangement, etc. of the reinforcing fiber packages 1 to be stored.
A partition member for partitioning each reinforcing fiber package 1 may be provided in the storage body 22 .

Six openings 30 corresponding to the respective reinforcing fiber packages 1 are formed in the upper lid 24 .
In the packaged item 100 of this example, the reinforcing fiber package 1 is in a state in which the support 10 is removed. The first end 12 a and the second end 12 b of the reinforcing fiber bundle 12 in each reinforcing fiber package 1 are pulled out so that the reinforcing fiber bundle 12 passes through the opening 30 of the upper lid 24 . The first ends 12a of the reinforcing fiber bundles 12 in the reinforcing fiber package 1 and the second ends 12b of the reinforcing fiber bundles 12 in the different reinforcing fiber package 1 are connected to the respective openings 30. are passed through, the reinforcing fiber bundles 12 of the six reinforcing fiber packages 1 are connected above the upper lid 24 so as to be connected in series.
The first end 12a and the second end 12b of the reinforcing fiber bundles 12 are connected to each other, except that each reinforcing fiber bundle 12 is pulled out through the opening 30 of the upper lid 24, and is explained in the method of connecting the reinforcing fiber bundles. You can do it as you see fit.

When the reinforcing fiber bundles 12 of the reinforcing fiber packages 1 in the package 100 are connected in series, the heat-shrinkable film 16 is in close contact with the outer peripheral surface 14a of the cylindrical body 14 of each reinforcing fiber package 1. left. That is, the heat-shrinkable film 16 on the outer peripheral surface 14a of the cylindrical body 14 is not broken.

The size of the opening 30 is smaller than the size of the upper end surface 14b of the cylindrical body 14 in the reinforcing fiber package 1 before use so that the heat-shrinkable film 16 of the reinforcing fiber package 1 does not easily pass through. This prevents the heat-shrinkable film 16 from being sent to the next step together with the reinforcing fiber bundles 12 when the remaining amount of the reinforcing fiber bundles 12 is reduced.

The planar view shape of the opening 30 is circular in this example. In addition, the planar view shape of the opening 30 is not limited to a circular shape, and may be a rectangular shape or the like.

In the package 100, as shown in FIG. 6, the reinforcing fiber bundles 12 are pulled out from the inner peripheral surface side of the cylindrical body 14 through the opening 30 of the upper lid 24 and cut without taking out the reinforcing fiber packages 1. etc. In this way, the package storage object 100 can be used by pulling out the reinforcing fiber bundle while the reinforcing fiber package 1 is stored.

In the packaged article of the present invention described above, a plurality of reinforcing fiber packages can be transported while each reinforcing fiber package is stored, and the reinforcing fiber bundle can be pulled out and used while each reinforcing fiber package is stored in the box body. Convenient handling.

Note that the package storage item of the present invention is not limited to the package storage item 100 described above.
For example, the number of reinforcing fiber packages to be accommodated in the box in the packaged article of the present invention is not limited to 6, and may be 5 or less, or may be 7 or more.
The box body of the packaged goods of the present invention may have a top lid without an opening, or may have no top lid.

For example, when the packaged item 100 includes six reinforcing fiber packages 1, the packaged item of the present invention is obtained by connecting the reinforcing fiber bundles 12 of each three reinforcing fiber packages 1 in series. may

The packaged article of the present invention may be one in which the reinforcing fiber bundles of the respective reinforcing fiber packages are not connected to each other. In this case, the work of connecting the reinforcing fiber bundles may be performed at the site of use. Also, in this case, each reinforcing fiber package may be housed with the support. From the viewpoint of facilitating on-site work, it is preferable that each reinforcing fiber package is housed in a box with the support member pulled out.

The packaged article of the present invention may be the reinforcing fiber package 2 housed in a box.
For example, in the case of a box body in which the reinforcing fiber package can be installed so that the first end can be pulled out from the lower end surface of the cylindrical body, the first end of the reinforcing fiber bundle is heat-shrunk with the outer peripheral surface of the cylindrical body. It may also be a packaged item in which a reinforcing fiber package is housed in a box, the portion near the first end being disposed on the lower end surface of the tubular body while being positioned between the elastic films. Further, the reinforcing fiber package in which the first end of the reinforcing fiber bundle is positioned inside the cylinder of the tubular body and the part near the first end is arranged on the lower end surface of the tubular body is attached to the box. It may be a stored package.
In the packaged article of the present invention, the plurality of reinforcing fiber packages housed in the box may have the same mode or different modes.

[Method for producing fiber-reinforced composite material]
The method for producing a fiber-reinforced composite material of the present invention is a method for producing a fiber-reinforced composite material using the reinforced fiber package or package contents of the present invention. For the method for producing the fiber-reinforced composite material of the present invention, known modes can be adopted, except that the reinforcing fiber bundle is pulled out from the reinforcing fiber package of the present invention or the reinforcing fiber package in the packaged article.

Hereinafter, as an example of the method for producing the fiber-reinforced composite material of the present invention, a method for producing SMC using the reinforcing fiber package 1 or the packaged object 100 will be described. The method for producing a fiber-reinforced composite material of this embodiment is characterized by having the following drawing step, cutting step, and resin impregnation step.
Pulling out step: a step of pulling out the reinforcing fiber bundle 12 from the reinforcing fiber package 1 or the reinforcing fiber package 1 in the package 100 .
Cutting step: A step of cutting the pulled-out reinforcing fiber bundle 12 into short fibers.
Resin impregnation step: A step of impregnating the cut reinforcing fiber bundles 12 with a resin composition to obtain an SMC.

(Extraction process)
For example, as shown in FIG. 4, in a state in which the reinforcing fiber bundles 12 of the plurality of reinforcing fiber packages 1 are connected in series, the reinforcing fiber bundles 12 are continuously arranged upward from the inner peripheral surface side of the cylindrical body 14. pull out to
In the case of the package storage item 100, as shown in FIG. 6, the reinforcing fiber bundles 12 of the respective reinforcing fiber packages 1 stored are connected in series, and the cylindrical body is passed through the opening 30 of the upper lid 24. The reinforcing fiber bundle 12 is continuously drawn upward from the inner peripheral surface side of 14 .

(Cutting process)
The reinforcing fiber package 1 or the reinforcing fiber bundle 12 pulled out from the reinforcing fiber package 1 in the packaged object 100 is cut by a rotary cutter so as to have a desired fiber length.

(Resin impregnation step)
The SMC is manufactured by impregnating the cut reinforcing fiber bundles 12 with the resin composition.
A known method can be adopted as a method of impregnating the resin composition.

The resin composition with which the cut reinforcing fiber bundles 12 are impregnated can employ known resins used in fiber-reinforced composite materials, and may be thermosetting resin compositions or thermoplastic resin compositions. good.

Examples of thermosetting resins include epoxy resins, vinyl ester resins, unsaturated polyester resins, polyimide resins, maleimide resins, and phenol resins. When carbon fibers are used as the reinforcing fibers, epoxy resins or vinyl ester resins are preferable from the viewpoint of adhesion to the carbon fibers.
Examples of thermoplastic resins include polyamide resins, acrylonitrile-butadiene-styrene (ABS) resins, acrylonitrile-ethylene-propylene-diene-styrene (AES) resins, acrylonitrile-styrene-acrylate (ASA) resins, and the like.
Resin may be used individually by 1 type, and may use 2 or more types together.

The resin composition contains components other than the resin, such as flame-retardant materials (bromine-based compounds, compounds containing phosphorus and nitrogen, phosphorus-based compounds, metal hydroxides, silicone-based compounds, and hindered amine compounds, etc.). good too.
The components other than the resin to be blended in the resin composition may be one kind, or two or more kinds.

A fiber-reinforced composite material molded article can be obtained by molding the SMC obtained in the resin impregnation step in combination with a fiber-reinforced composite material other than SMC as necessary.

In the method for producing a fiber-reinforced composite material of the present invention described above, it is possible to suppress the reinforcing fiber bundles from losing their shape and becoming entangled while ensuring the handleability of the reinforcing fiber package. can be manufactured.

The method for producing the fiber-reinforced composite material of the present invention is not limited to the method for producing SMC described above.
For example, the method for producing a fiber-reinforced composite material of the present invention may be a method that does not have a cutting step before the resin impregnation step.
The method for producing a fiber-reinforced composite material of the present invention may be a method for producing a bar-shaped fiber-reinforced composite material (pultruded material) by impregnating a reinforcing fiber bundle pulled out from a reinforcing fiber package with a resin composition.

EXAMPLES The present invention will be described in detail below with reference to Examples, but the present invention is not limited by the following description.
[Measurement of ratio B/A]
The thickness A of the carbon fiber bundle at five arbitrary locations was measured with a plane probe micrometer having a diameter of 6 mm, and the width B at arbitrary five locations was similarly measured with a vernier caliper. Then, using the average values of the thickness A and the width B, the ratio B/A of the carbon fiber bundles was calculated.

[Production Example 1]
Using a mixer (manufactured by Tokushu Kika Kogyo Co., Ltd., trade name: Hivis Dispermix, homomixer specifications: model 3D-5), a sizing liquid was prepared by phase inversion emulsification in the following procedure.
Epoxy resin jER (registered trademark) 828 (trade name, manufactured by Mitsubishi Chemical Corporation) 40 parts by weight, epoxy resin jER (registered trademark) 1001 (trade name, manufactured by Mitsubishi Chemical Corporation) 40 parts by weight, and nonionic surfactant 20 parts by mass of Pluronic F88 (trade name, manufactured by BASF) was kneaded and mixed at 90° C. with a planetary mixer and a homomixer to obtain a resin composition (II) (sizing agent). Next, deionized water was dropped little by little into this resin composition, and after the phase inversion point was passed, the amount of water to be dropped was increased. Finally, a sizing liquid having a resin composition concentration of 40% by mass was obtained.

[Example 1]
A carbon fiber bundle (manufactured by Mitsubishi Rayon Co., Ltd., trade name: Pyrofil (registered trademark) TR 50S15L (number of filaments: 15,000, strand strength: 5,000 MPa, strand elastic modulus: 242 GPa)) to which no sizing agent was attached was produced in Production Example 1. The sizing liquid is immersed in an aqueous dispersion adjusted to have a solid content of 5% by mass, and after adjusting the liquid content to 20% by mass with respect to the carbon fiber bundle with a nip roll, it is dried in a hot air drying oven at 150 ° C. for 2 minutes. bottom. The ratio B/A of the width B to the thickness A of the obtained carbon fiber bundle was 55.
Using the winding machine A described in Example 1 of Japanese Patent Application Laid-Open No. 2009-221017, a center pull paper tube (support 10) having an inner diameter of 82 mm and a length of 280 mm and having continuous perforations in the axial direction, 5000 m of carbon fiber bundles (reinforcing fiber bundles 12) are continuously wound so as to form a cylindrical body having a length of 265 mm in the paper tube axial direction, and the carbon fiber bundle cylindrical body (cylindrical body) shown in FIG. 14) was formed. The obtained cylindrical carbon fiber bundle cylinder had an outer diameter of 160 mm.

As shown in FIG. 9, a ring is formed from the reinforcing fiber bundles 12 on the outer peripheral surface 14a side of the obtained carbon fiber bundle tubular body (tubular body 14), and the portion closer to the first end 12a than the ring is The portion of the reinforcing fiber bundle 12 on the side of the first end 12a was tied by encircling it along the outer peripheral surface 14a, partially folding it in two, and inserting it into the loop. At this time, the length from the knot 13 to the first end 12a was set to 40 cm.
Next, as shown in FIG. 10, the portion from the knot 13 to the first end 12a of the reinforcing fiber bundle 12 is passed through the upper end surface 14b of the cylindrical body 14 so that the first end 12a is connected to the knot on the outer peripheral surface 14a. 13 and placed on the opposite side. A low-density polyethylene heat-shrinkable film (heat-shrinkable film 16) having a height of 385 mm, a length of 530 mm, and a thickness of 20 μm (the length in the axial direction of the paper tube; hereinafter the same) is placed around the cylindrical body 14 in this state. After winding, both ends 16a and 16b in the length direction of the film were overlapped by 5 mm and fused. Further, the cylindrical body 14 and the heat-shrinkable film 16 were heated at 130° C. for 20 seconds to heat-shrink the film and adhere it to the cylindrical body 14 to obtain a carbon fiber bundle package.
In the obtained carbon fiber package, the heat-shrinkable film 16 is removed by grabbing and pulling a portion of the reinforcing fiber bundle 12 located on the upper end surface 14b of the cylindrical body 14, which is 30 cm from the first end 12a. It was possible to pull out the first end 12a without removing it.

[Example 2]
Example 1 except that the portion on the first end 12a side of the reinforcing fiber bundle 12 in the cylindrical body 14 obtained in the same manner as in Example 1 has a length of 30 cm from the knot 13 to the first end 12a. tied in the same way.
Next, as shown in FIG. 11, the portion from the knot 13 to the first end 12a of the reinforcing fiber bundle 12 is passed through the upper end surface 14b of the tubular body 14, and the first end 12a is a center-pull paper tube ( It was arranged so as to be positioned inside the support 10 ), that is, inside the tube of the tubular body 14 . A low-density polyethylene heat-shrinkable film (heat-shrinkable film 16A) having a height of 385 mm, a length of 530 mm, and a thickness of 20 μm was wrapped around the cylindrical body 14 in this state, and then both ends in the length direction of the film were wrapped. The portions 16a and 16b were overlapped by 5 mm and fused. Further, the cylindrical body 14 and the heat-shrinkable film 16 were heated at 130° C. for 20 seconds to heat-shrink the film and adhere it to the cylindrical body 14 to obtain a carbon fiber bundle package. As a result, the heat-shrinkable film 16A covered the outer peripheral surface 14a, the upper end surface 14b and the lower end surface 14c of the tubular body 14. As shown in FIG.
In the obtained carbon fiber package, the portion of the heat-shrinkable film 16A covering the upper end surface 14b of the tubular body 14 is broken, and the first end 12a of the carbon fiber bundle located inside the support 10 is pulled out and held. did it. That is, the first end 12a of the reinforcing fiber bundle 12 could be pulled out without removing the portion of the heat-shrinkable film 16A covering the outer peripheral surface 14a of the cylindrical body 14. FIG.

[Comparative Example 1]
As shown in FIG. 12, the length from the knot 13 to the first end 12a of the reinforcing fiber bundle 12 in the cylindrical body 14 obtained in the same manner as in Example 1 is 10 cm. It was tied in the same manner as in Example 1 except that Next, a low-density polyethylene heat shrink is applied to the outer peripheral surface 14a of the tubular body 14 in a state where the entire portion from the knot 13 to the first end 12a of the reinforcing fiber bundle 12 is arranged on the outer peripheral surface 14a of the tubular body 14 . A carbon fiber bundle package was obtained in the same manner as in Example 1 except that a flexible film (heat-shrinkable film 16) was wound.
In the obtained carbon fiber package, even if the perforations of the center-pull paper tube (support 10) are cut and removed, the heat-shrinkable film 16 is not removed, and the first ends 12a of the reinforcing fiber bundles 12 are not removed. could not be pulled out.

Reference Signs List 1, 2 reinforcing fiber package 10 support 12 reinforcing fiber bundle 12a first end 12b second end 14 tubular body 14a outer peripheral surface 14b upper end surface 14c lower end surface 16, 16A heat-shrinkable film 18 connecting portion 20 box 22 Storage body 24 Upper lid 26 Bottom surface 28 Side surface 30 Opening 100 Package contents

Claims (7)

A part of the outer peripheral surface and the end face of a cylindrical body formed by winding a reinforcing fiber bundle in a cylindrical shape is covered with a heat-shrinkable film, and the heat-shrinkable film is heat-shrunk to partially cover the outer peripheral surface and the end face. A reinforced fiber package in close contact with
The reinforcing fiber bundle has a first end on the outer peripheral surface side and a second end on the inner peripheral surface side of the cylindrical body,
The portion near the first end has a knot,
The knot encircles the outer peripheral surface of the cylindrical body in the portion closer to the first end than the loop in the loop formed by the portion closer to the first end of the reinforcing fiber bundle. It is a knot with a part of the tip passed in a double-folded state,
A portion of the reinforcing fiber bundle closer to the first end than the knot has an exposed portion on one end surface of the cylindrical body, and the first end is on the opposite side of the knot on the outer peripheral surface. , arranged to be positioned between the outer peripheral surface of the tubular body and the heat-shrinkable film,
Reinforcement fiber package. A reinforcing fiber package in which the outer peripheral surface of a cylindrical body formed by winding reinforcing fiber bundles in a cylindrical shape is covered with a heat-shrinkable film, and the heat-shrinkable film is heat-shrunk and adheres to the outer peripheral surface,
The reinforcing fiber bundle has a first end on the outer peripheral surface side and a second end on the inner peripheral surface side of the cylindrical body,
The portion near the first end has a knot,
The knot encircles the outer peripheral surface of the cylindrical body in the portion closer to the first end than the loop in the loop formed by the portion closer to the first end of the reinforcing fiber bundle. It is a knot with a part of the tip passed in a double-folded state,
A portion of the reinforcing fiber bundle closer to the first end than the knot passes through one end surface of the cylindrical body, and the first end is on the opposite side of the knot on the outer peripheral surface, and the cylindrical body arranged so as to be positioned between the outer peripheral surface of the
Reinforcement fiber package. The outer peripheral surface of a cylindrical body in which a reinforcing fiber bundle is cylindrically wound around a cylindrical support is covered with a heat-shrinkable film, and the heat-shrinkable film is heat-shrunk to provide reinforcement in close contact with the outer peripheral surface. A fiber package,
The reinforcing fiber bundle has a first end on the outer peripheral surface side and a second end on the inner peripheral surface side of the cylindrical body,
The portion near the first end has a knot,
The knot encircles the outer peripheral surface of the cylindrical body in the portion closer to the first end than the loop in the loop formed by the portion closer to the first end of the reinforcing fiber bundle. It is a knot with a part of the tip passed in a double-folded state,
A reinforcing fiber in which a portion of the reinforcing fiber bundle closer to the first end than the knot passes through one end surface of the cylindrical body, and the first end is disposed inside the cylindrical support. package. 4. The reinforcing fiber package according to claim 3, wherein said tubular support can be pulled out from said tubular body. The reinforcing fiber package according to any one of claims 2 to 4, wherein the heat-shrinkable film also adheres to the end surface of the cylindrical body having the portion near the first end. 6. The method according to any one of claims 2 to 5, wherein the portion of the reinforcing fiber bundle closer to the first end than the knot has a portion not covered with the heat-sealable film in the portion passing through one end surface of the cylindrical body. A reinforcing fiber package according to any one of the preceding paragraphs. A method for manufacturing a reinforcing fiber package in which the outer peripheral surface of a cylindrical body in which a reinforcing fiber bundle is wound in a cylindrical shape is covered with a heat-shrinkable film, and the heat-shrinkable film is heat-shrunk to adhere to the outer peripheral surface. There is
forming the tubular body by winding the reinforcing fiber bundle into a tubular shape;
On the outer peripheral surface side of the tubular body, a ring is formed at a portion closer to the first end on the outer peripheral surface side of the reinforcing fiber bundle, and the portion closer to the first end than the ring is stretched along the outer peripheral surface. Make one turn, fold a part of the tip in half and pass it through the loop to form a knot,
The part of the reinforcing fiber bundle closer to the first end than the knot is passed through one end surface of the cylindrical body, and the first end is on the opposite side of the knot on the outer peripheral surface, and the cylindrical body Arranged so that it is located between the outer peripheral surface of and the heat shrink film,
Further, in this state, a heat-shrinkable film is wrapped around the cylindrical body, heated to shrink the heat-shrinkable film, and the heat-shrinkable film is adhered to the outer peripheral surface and the end surface of the cylindrical body. A method for manufacturing a reinforced fiber package, characterized by:

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