JPH09324331A - Composite yarn for composite material and manufacturing method thereof - Google Patents

Abstract

(57) Abstract: A mixed fiber for a composite material, in which a continuous reinforcing fiber bundle and a continuous thermoplastic resin fiber bundle are uniformly mixed, and a method for producing the same. SOLUTION: An untwisted continuous reinforcing fiber bundle 12a and an untwisted continuous thermoplastic resin fiber bundle 22a are each subjected to an opening process, and an opening index F defined by the following mathematical formula 1 is
After obtaining the opened continuous reinforced fiber bundles 12b and the opened continuous thermoplastic resin fiber bundles 22b which are respectively 0.5 to 3, the opened continuous reinforced fiber bundles 12b and the opened continuous thermoplastic resin fiber bundles 22b are The fibers are mixed to obtain the mixed yarn 16 for composite material. ## EQU1 ## F = W / DN (where F is the opening index, W is the width (mm) of the fiber bundle, D is the diameter of the single fiber (mm), and N is the number of single fibers in the fiber bundle. Represents
The width of the fiber bundle is measured in a tangible state in the wound yarn, and is measured in the state at the outlet of the processing device immediately after the fiber opening treatment. )

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed fiber for a composite material in which a continuous reinforcing fiber bundle and a continuous thermoplastic resin fiber bundle are uniformly mixed, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, fiber reinforced thermoplastic resin (FR
As one of the molding materials of (TP), a mixed fiber for composite material in which a continuous reinforcing fiber bundle and a continuous thermoplastic resin fiber bundle are mixed and used is used. In the following description, when simply referred to as a continuous fiber bundle, it means both a continuous reinforcing fiber bundle and a continuous thermoplastic resin fiber bundle.

[0003] Such a mixed fiber for a composite material uniformly mixes a continuous reinforcing fiber bundle and a continuous thermoplastic resin fiber bundle so that mechanical properties can be sufficiently exhibited when formed into a composite material molded product. It is said that fiber is most important, and for this reason, continuous fiber bundles are subjected to an opening process.

This fiber-opening treatment method is, for example, as disclosed in Japanese Patent Laid-Open No. 60-209034, a method in which air is blown to the mixed fiber to mix the yarns, and Japanese Patent Laid-Open No. 62-135537 is listed. As described above, a method of introducing the continuous fiber bundle into the turbulent air flow is known.

However, in these methods,
Since it is difficult to keep the air flow direction and flow rate constant, the degree of opening of the continuous fiber bundle is not uniform, and the part where the opening is not sufficient and the air flow is too strong may cause single fiber breakage. A part to be generated is formed, and therefore, the continuous reinforcing fiber bundle and the continuous thermoplastic resin fiber bundle cannot be uniformly mixed, and mechanical properties are not sufficiently exerted when the composite material molded article is obtained. In addition, there is a problem that the appearance and workability are not good.

Further, in order to uniformly mix the continuous reinforced fiber bundle and the continuous thermoplastic resin fiber bundle, JP-A-2-308824 discloses a method of imparting crimpability to the thermoplastic organic continuous fiber bundle. Japanese Patent Laid-Open No. 3-33237 discloses a method of specifying the amount of the sizing agent applied to each continuous fiber bundle. Further, as a method of suppressing the occurrence of single fiber breakage and opening the fibers, JP-A-2-28219 and JP-A-4-73227 disclose a method of opening a continuous fiber bundle in a liquid. There is.

[0007]

However, in any of the above-mentioned conventional methods, it is difficult and sufficient to sufficiently open the continuous reinforcing fiber bundle and the continuous thermoplastic resin fiber bundle for uniform mixing. There is a problem in that when the openability is to be obtained, single fiber breakage is likely to occur, and when trying to prevent the occurrence of single fiber breakage as much as possible, sufficient openability is not obtained. Furthermore, the method of opening the fibers in the liquid has a problem that an extra step of removing the liquid is required.

The present invention has been made in view of the above problems, and an object thereof is a mixed fiber for a composite material in which a continuous reinforcing fiber bundle and a continuous thermoplastic resin fiber bundle are uniformly mixed, and the same. To provide a manufacturing method.

[0009]

The first object of the present invention, which has been made to achieve the above object, is to open an untwisted continuous reinforcing fiber bundle and an untwisted continuous thermoplastic resin fiber bundle. In the mixed yarn with the fiber-treated product, the fiber-opening index F defined by the following mathematical formula 3 of each of the fiber-opened product of the continuous reinforcing fiber bundle and the fiber-opened product of the continuous thermoplastic resin fiber bundle is 0.5 to
3 is a mixed yarn for composite materials.

## EQU3 ## F = W / DN (where F is the opening index, W is the width (mm) of the fiber bundle, D is the diameter of the single fiber (mm), and N is the number of the single fiber in the fiber bundle. Represents
The width of the fiber bundle is measured in a tangible state in the wound yarn, and is measured in the state at the outlet of the processing device immediately after the fiber opening treatment. )

In the present invention, the opening index F is defined by the above mathematical expression 3, and hereinafter, only the opening index is described.

A second aspect of the present invention is a composite material mixture in which the continuous reinforcing fiber bundle is at least one selected from a glass fiber bundle, a carbon fiber bundle, an aramid fiber bundle, a metal fiber bundle and a ceramic fiber bundle. It is a yarn.

A third aspect of the present invention is that the continuous thermoplastic resin fiber bundle is at least one selected from polyolefin resins, polyamide resins, polyester resins, polyetherketones, polyethersulfones, and thermoplastic polyetherimides. A mixed fiber for composite material, which is a bundle of fibers obtained by melt-spinning of the thermoplastic resin.

In a fourth aspect of the present invention, an untwisted continuous reinforcing fiber bundle and an untwisted continuous thermoplastic resin fiber bundle are subjected to an opening treatment, respectively, so that the opening index is 0.5 to 3, respectively. After the continuous fiber-reinforced open fiber bundle and the continuous fiber-opened thermoplastic resin fiber bundle are obtained, the fiber-open continuous continuous fiber bundle and the fiber-opened continuous thermoplastic resin fiber bundle are mixed. This is a method for producing a mixed yarn for composite materials.

A fifth aspect of the present invention is a method for producing a mixed fiber for composite material, which comprises subjecting the open continuous reinforced fiber bundle and the open continuous thermoplastic resin fiber bundle to a further open process. is there.

A sixth aspect of the present invention is to provide a continuous reinforcing fiber bundle and a continuous thermoplastic resin fiber bundle in a gas flowing at an average flow rate of 10 to 50 m / sec from a direction substantially orthogonal to the flow direction of the gas. , Or introducing these mixed fibers, when passing through the gas flow, the continuous reinforcing fiber bundle, by giving a slack so as to sag 1 to 50 mm per length 10 mm along the passage direction, the continuous It is a method for producing a thermoplastic resin fiber bundle, or a mixed fiber for composite material, in which a mixed fiber of these is opened.

In a seventh aspect of the present invention, the continuous reinforcing fiber bundle is
It is a method for producing a mixed fiber for a composite material, which is at least one selected from a glass fiber bundle, a carbon fiber bundle, an aramid fiber bundle, a metal fiber bundle, and a ceramic fiber bundle.

In an eighth aspect of the present invention, the continuous thermoplastic resin fiber bundle is at least one selected from polyolefin resins, polyamide resins, polyester resins, polyetherketones, polyethersulfones, and thermoplastic polyetherimides. Is a method for producing a mixed fiber for composite material, which is a bundle of fibers obtained by melt spinning the thermoplastic resin.

According to the first mixed fiber for composite material of the present invention, the untwisted continuous reinforcing fiber bundle and the untwisted continuous thermoplastic resin fiber bundle have the opening indices of 0.5 to 3, respectively. Since the fibers are mixed in the opened state, it is possible to provide the mixed fiber for composite material in which the continuous reinforcing fiber bundle and the continuous thermoplastic resin fiber bundle are uniformly mixed at the single fiber level. Therefore, by using this mixed yarn for a composite material, it is possible to obtain a composite material that exhibits sufficient mechanical properties and has an excellent appearance, and a molded article thereof.

Further, according to the fourth method for producing a mixed fiber for composite material of the present invention, the untwisted continuous reinforcing fiber bundle and the untwisted continuous thermoplastic resin fiber bundle are respectively subjected to the opening treatment. Since the fibers are applied and opened so that each opening index becomes 0.5 to 3, the obtained opened continuous reinforced fiber bundle and the opened continuous thermoplastic resin fiber bundle are mixed, so that single fiber It is possible to obtain a mixed fiber for composite material that is uniformly mixed at a level with good workability.

Further, according to the fifth method for producing a mixed fiber for composite material of the present invention, after the opened continuous reinforcing fiber bundle and the opened continuous thermoplastic resin fiber bundle are mixed, the opened fiber is further opened. Since the treatment is applied, the continuous reinforcing fiber bundle and the continuous thermoplastic resin fiber bundle are
A more uniformly mixed fiber for composite material can be obtained.

According to the sixth method for producing a mixed fiber for composite material of the present invention, the fiber can be opened so as to have industrially good workability and to have the fiber opening index specified in the present invention. The principle of this method is not yet well understood, but the continuous fiber bundle spreads outward and opens due to the pressure difference generated due to the difference in the gas flow velocity between the center and both ends in the width direction of the continuous fiber bundle. it is conceivable that. In addition, according to this method, damage such as breakage of single fibers is not caused, so that strength reduction does not occur when the composite material molded product is formed, and it is not necessary to remove the liquid or the like used for opening.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as the continuous reinforced fiber bundle, those usually used for fiber reinforced composite materials can be used, and examples thereof include a glass fiber bundle, a carbon fiber bundle,
An aramid fiber bundle, a metal fiber bundle, a ceramic fiber bundle, or the like can be used, but it is preferable to use the glass fiber bundle in terms of physical properties, price, and the like. In addition, these continuous reinforcing fiber bundles are mixed with the continuous thermoplastic resin fiber bundle, and when heated to melt the continuous thermoplastic resin fiber bundle, in order to enhance wettability and adhesiveness with the thermoplastic resin. The surface may be subjected to a surface treatment.

The number of continuous reinforcing fiber bundles to be bundled is preferably 10 to 10,000 in consideration of handleability. In the case of a glass fiber bundle, strands are preferably used, but roving such as single end roving may be used. Moreover, as the continuous reinforcing fiber bundle, a substantially untwisted one is used. A twisted product is not preferable because it is not sufficiently opened when subjected to the opening process.

The reinforcing fiber content of the mixed fiber for composite material of the present invention is not particularly limited, but from the viewpoint of reinforcing effect and physical properties,
It is preferably 10 to 90% by weight, more preferably 30 to 80% by weight.

As the continuous thermoplastic resin fiber bundle used in the present invention, those used for mixed fiber for composite materials can be generally used. For example, polyolefin resin such as polyethylene and polypropylene, nylon 6, nylon 6, nylon 6, and the like. 6
Polyamide resin such as polyethylene terephthalate,
Polyester resin such as polybutylene terephthalate,
A fiber bundle obtained by melt spinning a thermoplastic resin such as polyether ketone, polyether sulfone, or thermoplastic polyether imide can be used.

As for the number of continuous thermoplastic resin fiber bundles, it is preferable to use a single fiber denier of 2 to 20 and a number of bundles of 30 to 20,000. Further, as the continuous thermoplastic resin fiber bundle, a substantially non-twisted one is used. The twisted one is
It is not preferable because the fibers are not sufficiently opened when the fibers are subjected to the opening process.

1 and 2 show an example of a manufacturing apparatus for carrying out the present invention. FIG. 1 is a schematic side view of the manufacturing apparatus, and FIG. 2 is a schematic plan view of one fiber opening apparatus in the manufacturing apparatus.

In FIGS. 1 and 2, 11 is a wound body of a continuous reinforcing fiber bundle 12a, and 21 is a continuous thermoplastic resin fiber bundle 22a.
, A drive roll for pulling out the continuous reinforcing fiber bundle 12a or the continuous thermoplastic resin fiber bundle 22a, 14
Is an opening device that forms a gas flow by a suction method, 15 is a combination roll for mixing the opened continuous reinforcing fiber bundle 12b and the opened continuous thermoplastic resin fiber bundle 22b, and 17 is for the obtained composite material It is a winding machine for winding the mixed fiber 16.

According to this apparatus, the continuous reinforcing fiber bundle 12a is pulled out from the outside while rotating the winding body 11 of a plurality of continuous reinforcing fiber bundles, and the drive roll 13 is driven.
And is supplied to one of the fiber opening devices 14. Similarly, the continuous thermoplastic resin fiber bundles 22a are respectively pulled out from the outside while rotating the winding body 21 of the plurality of continuous thermoplastic resin fiber bundles, pass through the drive roll 13, and the other opening device 14 Is supplied to. The continuous reinforcing fiber bundle 12
a, the continuous thermoplastic resin fiber bundle 22a is pulled out from the outside while rotating the winding bodies 11 and 21, respectively. The continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 2
This is to prevent twisting of 2a.

The fiber opening device 14 forms a gas flow flowing in the direction of arrow a at an average flow velocity of 10 to 50 m / sec by, for example, suction means. The continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a are respectively introduced from a direction substantially orthogonal to the gas flow, and a slack A of 1 to 50 mm is slackened per 10 mm in length along the passage direction. While being given B, it passes through the gas stream. Then, the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a are subjected to opening treatment while passing through the gas flow, respectively, and the opening index defined by the mathematical formula 3 is set to 0.5 to 3. Continuous fiber reinforced fiber bundle 12b, open continuous thermoplastic resin fiber bundle 22
b is obtained.

The open fiber continuous reinforcing fiber bundle 12b and the open fiber continuous thermoplastic resin fiber bundle 22b are combined with the combination rolls 15, 15.
After being guided between them to be mixed and made into the mixed yarn 16 for the composite material, it is wound by the winder 17 in the direction of arrow B.

In the fiber opening device 14, any gas may be used as long as it is a safe gas such as air and inert gas, but it is necessary that the gas flows at an average flow rate of 10 to 50 m / sec. When the average flow velocity of gas is less than 10 m / sec, it takes time until the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a are sufficiently opened, or the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a are not sufficiently opened, and 50 m / sec is required. When it exceeds, the continuous reinforcing fiber bundle 12a,
It is not preferable because the single fibers constituting the continuous thermoplastic resin fiber bundle 22a are easily broken.

Further, the slack A of the continuous reinforcing fiber bundle 12a,
The slack B of the continuous thermoplastic resin fiber bundle 22a is slackened by 1 to 50 mm per 10 mm in length along the passage direction. If the amount of slack for a length of 10 mm is less than 1 mm, the fiber is not sufficiently opened, and if it exceeds 50 mm, excessive vibration occurs in the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a. When adjacent portions or a plurality of continuous reinforcing fiber bundles 12a, 12a ... Or continuous thermoplastic resin fiber bundles 22a, 22a ... Are simultaneously opened in parallel, the adjacent continuous reinforcing fiber bundle 12a or continuous It is not preferable because it is likely to be damaged by coming into contact with the thermoplastic resin fiber bundle 22a.

Opened continuous reinforcing fiber bundle 12b subjected to opening processing
The open fiber continuous thermoplastic resin fiber bundle 22b has an open index of 0.5 to 3, preferably 0.5 to 2. When the opening index is less than 0.5, the opening is insufficient and the open continuous reinforcing fiber bundle 12b and the open continuous thermoplastic resin fiber bundle 22b.
When and are not uniformly mixed and the opening index exceeds 3, it becomes difficult to handle the opened continuous reinforcing fiber bundle 12b and the opened continuous thermoplastic resin fiber bundle 22b after opening.

Further, in the opening treatment of the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a, the opening index is 0.5 to 3.
Any method other than the above may be used as long as the above method can be used. For example, while sending the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a to the tubular passage,
A method in which compressed air is jetted to this passage to open the fiber by a high-speed air flow generated, or a continuous reinforcing fiber bundle 12a and a continuous thermoplastic resin fiber bundle 22a are bent by bending between a plurality of tension bars to open It is also possible to adopt a method of making it happen.

However, in order to reduce damage to the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a and to open the fiber sufficiently, it is preferable to adopt the method shown in FIGS. After the fiber-spreading process is performed once, the fiber-spreading process may be performed again while maintaining the fiber-spreading state. Also,
Before introducing the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle 22a into the fiber-spreading device 14 shown in FIGS. 1 and 2, the continuous reinforcing fiber bundle 12a and the continuous thermoplastic resin fiber bundle are formed by the conventional method as described above. Within the range that does not damage 22a,
You may give preliminary opening.

The composite yarn 16 for composite material obtained as described above can be further subjected to a fiber-opening treatment in the same manner as described above to further uniformly mix the fibers.

The mixed fiber for composite material 16 of the present invention obtained as described above is heated by using a heating roll or the like to melt the open continuous thermoplastic resin fiber bundle 22b, or the mixed material for composite material is mixed. A woven fabric can be produced from the yarn to be used as a molded article precursor. Then, by laminating a desired number of the molded article precursors and heating and pressurizing them, a FRTP molded article can be obtained.

The mixed yarn for composite material of the present invention can be used for FRTP molded articles in a wide variety of fields such as automobile materials, industrial materials, electric and electronic materials, and construction civil engineering materials.

[0040]

【Example】

Example 1 As a continuous reinforcing fiber bundle, 2000 single filaments having a diameter of 16 μm were used.
Book, made by bundling with epoxy-based sizing agent 11
Single-ended roving of 50tex glass fiber was used. This single end roving passes through the air flow of the suction opening device with a slit width of 30 mm flowing into the air flow flowing at an average flow velocity of 20 m / sec from a direction substantially perpendicular to the air flow direction. 10mm length along the passing direction
Was introduced with a slack of 10 mm, and the fiber was opened. The width of the opened glass fiber bundle is
It was 32 mm and the opening index was 1.0.

Further, as the continuous thermoplastic resin fiber bundle,
Single fiber count 2.4 denier (single fiber diameter 16 μm), number of bundles
96 polyester multifilaments (polyester fiber bundles) were used. When passing the 21 polyester fiber bundles into the air flow of the suction opening device similar to the above at an average flow rate of 15 m / sec, from a direction substantially perpendicular to the air flow direction, Length 10 along the passing direction
It was introduced while giving a slack of 10 mm with respect to mm, and subjected to fiber opening treatment. The width of the opened polyester fiber bundle was 32 mm, and the opening index was 1.0.

The obtained open fiber glass fiber bundle and the open fiber polyester fiber bundle were overlapped to obtain a mixed fiber for composite material.

Next, draw 38 of these mixed filament yarns together and
Put in a mold at ℃, melt the polyester fiber,
A 2.0 mm unidirectionally reinforced flat composite material was obtained. The glass content at this time was 66% by weight.

Example 2 The mixed fiber for composite material obtained in Example 1 was used again in the same direction as the air flow flowing at an average flow rate of 15 m / sec using the same suction opening device in the air flow direction. The length along the passage direction when passing through the air flow from the direction almost orthogonal to
A molded product was prepared in the same manner as in Example 1 except that the fiber was introduced with a slack of 10 mm with respect to 10 mm and subjected to a fiber-spreading process so that the fiber-spreading index of each fiber bundle was 2.0. Obtained.

Example 3 When the glass fiber bundle was opened in Example 1, the average flow velocity of air was changed to 40 m / sec and the slack was set to 10 mm.
Instead of 30 mm, an open glass fiber bundle having a width of 48 mm and an opening index of 1.5 was obtained in the same manner as in Example 1.

When the polyester fiber bundle was opened in Example 1, the average flow velocity of air was changed to 30 m / sec, and the slack was changed from 10 mm to 30 mm.
In the same manner as described above, an opened polyester fiber bundle having a width of 48 mm and an opening index of 1.5 was obtained.

The opened fiberglass bundle and the opened polyester fiber bundle thus obtained were treated in the same manner as in Example 1 to obtain a mixed fiber for composite material, and then a molded product.

Example 4 The mixed fiber for composite material obtained in Example 3 was opened under the same conditions as in Example 2 again using the same suction opening device as in Example 2. Then, a molded product was obtained in the same manner as in Example 1 except that the opening index of each fiber bundle was set to 3.0.

Comparative Example 1 When the glass fiber bundle was opened in Example 1, the average flow velocity of air was changed to 5 m / sec, and the slack was changed from 10 mm to 3 mm, and the same procedure as in Example 1 was followed. A spread glass fiber bundle having a width of 9.6 mm and an opening index of 0.3 was obtained.

When the polyester fiber bundle was opened in Example 1, the average flow velocity of air was changed to 5 m / sec, the slack was changed from 10 mm to 3 mm, and the same procedure as in Example 1 was performed. A spread polyester fiber bundle having a width of 9.7 mm and a spread index of 0.3 was obtained.

The obtained opened fiber glass bundle and the opened polyester fiber bundle were treated in the same manner as in Example 1 to obtain a mixed yarn for composite material, and then a molded product.

Comparative Example 2 In Example 1, the glass fiber bundle and the polyester fiber bundle were subjected to the opening treatment, and high-speed air was blown from each of the directions orthogonal to the fiber bundle by using an air nozzle without sagging the fiber bundle. Instead of the method of spraying, the same procedure as in Example 1 was followed to obtain a mixed fiber for composite material, and then a molded product.

Test Example In Examples 1 to 4 and Comparative Examples 1 and 2, single fiber breakage of the reinforcing fiber bundle in the state of the mixed fiber for composite material was visually observed.
Also, the obtained molded product is cut out with a width of 15 mm, and JIS
By the method of K 7055, the bending strength and bending elastic modulus of the reinforcing fiber in the length direction were measured. Table 1 shows the results.

[0054]

[Table 1]

From the results shown in Table 1, the mixed fiber yarns for composite materials of Examples 1 to 4 in which the continuous reinforcing fiber bundles and the continuous thermoplastic resin fiber bundles have an opening index of 1.0 and 1.5, respectively, have an opening index of 0.3.
Both the bending strength and the bending elastic modulus of the mixed fiber for composite material of Comparative Example 1 of Comparative Example 1 which is low and the fiber bundle is opened by blowing high-speed air using an air nozzle without giving slack to the fiber bundle. It turns out to be excellent.

Further, Examples 1 to 4 and Comparative Example 1 in which the continuous reinforcing fiber bundle and the continuous thermoplastic resin fiber bundle were introduced into an air stream flowing at a specific flow rate while giving slack, and Comparative Example 1
It can be seen that, while the number of monofilament breaks is small, Comparative Example 2 in which the fiber bundle is opened by blowing high-speed air using an air nozzle without giving slack to the fiber bundle has many monofilament breaks.

Further, in comparison between Example 1 and Example 3, it can be seen that the higher the opening index is, the better the bending strength and the bending elastic modulus are. Furthermore, in the comparison between Example 1 and Example 2 and Example 3 and Example 4, it was found that the continuous fiber-reinforced open fiber bundle and the continuous fiber-opened thermoplastic resin fiber bundle were mixed together. It can be seen that the bending strength and the bending elastic modulus are further improved in the case where the fibers are further subjected to the opening treatment after the fibers are fined.

[0058]

As described above, according to the present invention,
Since the continuous reinforcing fiber bundle and the continuous thermoplastic resin fiber bundle are sufficiently opened, respectively, and then mixed, it is possible to obtain a mixed fiber for composite material in which both are uniformly mixed at the single fiber level. Therefore, by using this mixed fiber for composite material, it is possible to obtain an FRTP molded article having excellent mechanical properties and appearance.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of a manufacturing apparatus for carrying out the present invention.

FIG. 2 is a schematic plan view of a fiber opening device used in the same device.

[Explanation of symbols]

 11 Continuous Reinforced Fiber Bundle Winding Body 12a Continuous Reinforced Fiber Bundle 12b Opening Continuous Reinforced Fiber Bundle 13 Drive Roll 14 Opening Device 15 Laminating Roll 16 Mixed Fiber for Composite Material 17 Winder 21 Continuous Thermoplastic Resin Fiber Bundle Rolled body 22a Continuous thermoplastic resin fiber bundle 22b Opening continuous thermoplastic resin fiber bundle

Claims (8)

[Claims] 1. A mixed yarn of an untwisted continuous reinforcing fiber bundle opening-treated product and an untwisted continuous thermoplastic resin fiber bundle opening-treated product, wherein the continuous reinforcing fiber bundle opening-treated product is obtained. And a fiber opening index F defined by the following numerical formula 1 of each of the fiber-opened products of the continuous thermoplastic resin fiber bundle being 0.5 to 3; ## EQU1 ## F = W / DN (where F is the opening index, W is the width (mm) of the fiber bundle, D is the diameter of the single fiber (mm), and N is the number of single fibers in the fiber bundle. Represents
The width of the fiber bundle is measured in a tangible state in the wound yarn, and is measured in the state at the outlet of the processing device immediately after the fiber opening treatment. ) 2. The continuous reinforcing fiber bundle is a glass fiber bundle,
The mixed fiber for a composite material according to claim 1, which is at least one selected from a carbon fiber bundle, an aramid fiber bundle, a metal fiber bundle, and a ceramic fiber bundle. 3. The continuous thermoplastic resin fiber bundle contains at least one thermoplastic resin selected from polyolefin-based resins, polyamide-based resins, polyester-based resins, polyetherketones, polyethersulfones, and thermoplastic polyetherimides. The mixed fiber for composite materials according to claim 1 or 2, which is a bundle of fibers obtained by melt spinning. 4. An untwisted continuous reinforcing fiber bundle and an untwisted continuous thermoplastic resin fiber bundle are each subjected to an opening process so that the opening index F defined by the following mathematical formula 2 is 0.
After obtaining the opened continuous reinforced fiber bundle and the opened continuous thermoplastic resin fiber bundle which are set to 5 to 3, it is possible to mix the opened continuous reinforced fiber bundle and the opened continuous thermoplastic resin fiber bundle. A method for producing a mixed yarn for composite materials. ## EQU2 ## F = W / DN (where F is the opening index, W is the width (mm) of the fiber bundle, D is the diameter of the single fiber (mm), and N is the number of the single fiber in the fiber bundle. Represents
The width of the fiber bundle is measured in a tangible state in the wound yarn, and is measured in the state at the outlet of the processing device immediately after the fiber opening treatment. ) 5. The method for producing a mixed fiber for a composite material according to claim 4, wherein after the fiber-opened continuous reinforcing fiber bundle and the fiber-opened continuous thermoplastic resin fiber bundle are mixed, a fiber-opening treatment is further performed. 6. The continuous reinforcing fiber bundle, the continuous thermoplastic resin fiber bundle, or a mixed fiber thereof in a gas flowing at an average flow velocity of 10 to 50 m / sec from a direction substantially orthogonal to the flow direction of the gas. When introducing a substance and passing through the gas flow, 1 to 50 mm per 10 mm length along the passing direction
The method for producing a mixed fiber for a composite material according to claim 4 or 5, wherein the continuous reinforcing fiber bundle, the continuous thermoplastic resin fiber bundle, or a mixed fiber product thereof is subjected to an opening treatment by giving slack so as to sag. 7. The continuous reinforcing fiber bundle is a glass fiber bundle,
7. At least one selected from a carbon fiber bundle, an aramid fiber bundle, a metal fiber bundle, and a ceramic fiber bundle.
The method for producing a mixed fiber for composite materials according to any one of 1. 8. The continuous thermoplastic resin fiber bundle comprises at least one thermoplastic resin selected from a polyolefin resin, a polyamide resin, a polyester resin, a polyether ketone, a polyether sulfone, and a thermoplastic polyetherimide. The method for producing a mixed fiber for composite material according to any one of claims 4 to 7, which is a bundle of fibers obtained by melt spinning.