Fiber-reinforced resin composite and method for producing same

Abstract

Provided are: a fiber-reinforced resin composite having excellent bending strength; and a method for producing the fiber-reinforced resin composite. The present invention provides a fiber-reinforced resin composite which is provided with at least a reinforcing layer formed from a reinforcing fiber bundle impregnated with a thermoplastic resin, the reinforcing layer being imparted with an SZ twist, and the twist angle of the SZ twist being 180-720 DEG. Furthermore, the present invention provides a method for producing the fiber-reinforced resin composite, said method comprising at least a step for imparting an SZ twist at a twist angle of 180-720 degrees (inclusive).

Description

Technical Field

[0001] The present invention relates to a fiber-reinforced resin composite and a method for producing the same, and more particularly to a fiber-reinforced resin composite having excellent bending strength and a method for producing the same. Background Art

[0002] Fiber-reinforced resin products obtained by bonding reinforcing fibers with synthetic resins are used as materials to replace metal products in a wide range of fields such as automobile parts, electronic parts, agricultural and forestry materials, building materials, and furniture, from the viewpoint of high strength and light weight. Tubes, rods, and linear products that use long fiber bundles such as glass rovings, which are one of the products using the fiber-reinforced resin technology, as reinforcing fibers and resin as a matrix have also been used in various industrial fields.

[0003] Here, for example, Patent Document 1 discloses a continuous fiber reinforced resin composite material, characterized in that it is a continuous fiber reinforced resin composite material comprising continuous reinforcing fibers and a thermoplastic resin, and the interface coverage variation index of the continuous fiber reinforced resin composite material represented by an arbitrary formula is 0.8 to 1.2.

[0004] In addition, for example, Patent Document 2 discloses a continuous fiber reinforced resin composite material, characterized in that it contains continuous reinforcing fibers and a thermoplastic resin, the half-maximum full width of the (010) plane of the crystal phase in the inner layer is greater than 1.00, and the strength of the above-mentioned (010) plane is less than 40000.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2022-167223

[0008] Patent Document 2: Japanese Patent Application Publication No. 2022-167478 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, the fiber-reinforced resin composite materials produced in the prior art have low flexural strength, and deterioration of mechanical properties due to buckling and the like is a problem. Therefore, further improvement in flexural strength is required.

[0011] Therefore, in view of such actual circumstances, a main object of the present invention is to provide a fiber-reinforced resin composite having excellent bending strength and a method for producing the same.

[0012] Means for solving problems

[0013] The inventors of the present application conducted in-depth research and found that by focusing on the structure of the reinforcing layer in a fiber-reinforced resin composite, a fiber-reinforced resin composite with excellent flexural strength and a manufacturing method thereof can be obtained, thus completing the present invention.

[0014] That is, in the present invention, first, a fiber-reinforced resin composite is provided, which at least includes a reinforcing layer formed of a reinforcing fiber bundle impregnated with a thermoplastic resin. The reinforcing layer is given an SZ twist, and the twist angle (Japanese: reversal angle) of the SZ twist is 180° or more and 720° or less.

[0015] In the fiber-reinforced resin composite of the present invention, the pitch width of the SZ twist can be 800 mm or less.

[0016] The fiber-reinforced resin composite of the present invention may further include one or more coating layers that coat the outermost layer of the reinforcing layer with a thermoplastic resin.

[0017] In addition, in the present invention, a molded article using the fiber-reinforced resin composite is also provided.

[0018] Furthermore, in the present invention, a manufacturing method of a fiber-reinforced resin composite is also provided, which at least has a step of giving an SZ twist with a twist angle of 180° or more and 720° or less. The fiber-reinforced resin composite at least includes a reinforcing layer formed of a reinforcing fiber bundle impregnated with a thermoplastic resin. The reinforcing layer is given an SZ twist, and the twist angle of the SZ twist is 180° or more and 720° or less.

[0019] Advantages of the Invention

[0020] According to the present invention, a fiber-reinforced resin composite with excellent flexural strength and a manufacturing method thereof can be provided.

[0021] It should be noted that the effects described here are not necessarily restrictive, and may also be any effects described in this specification. Description of the Drawings

[0022] Figure 1 is a reference end view of an embodiment of the fiber-reinforced resin composite 1 (with the coating layer 12) of the present invention.

[0023] Figure 2 I is an enlarged view of an embodiment of the fiber-reinforced resin composite 1 (without the coating layer 12) of the present invention, Figure 2 II is a partial enlarged view between A-A of I.

[0024] Figure 3 is a schematic diagram showing the outline of the manufacturing method of the present invention. Detailed Embodiments

[0025] Hereinafter, preferred embodiments for implementing the present invention will be described in detail with reference to the accompanying drawings.

[0026] It should be noted that the embodiments described below represent an example of representative embodiments of the present invention, and the scope of the present invention is not narrowly construed thereby.

[0027] 1. Fiber Reinforced Resin Composite 1

[0028] Figure 1 It is a reference end view of an embodiment of the fiber reinforced resin composite 1 (with a coating layer 12) of the present invention. The fiber reinforced resin composite 1 of the present invention (hereinafter, also simply referred to as "the composite 1 of the present invention") at least includes a reinforcing layer 11. Additionally, according to requirements, one or two or more coating layers 12 may also be included.

[0029] As the shape of the composite 1 of the present invention, for example, it can be set to a substantially cylindrical shape or a substantially polygonal tubular shape. Specifically, "substantially cylindrical shape" refers to a shape whose cross-section is a flat shape such as a circle or an ellipse. Specifically, "substantially polygonal tubular shape" refers to a shape whose cross-section is a polygon such as a triangle or a quadrilateral.

[0030] The composite 1 of the present invention has excellent flexural strength. Therefore, as a material to replace metal articles, it can be expected to be used in a wider range of fields such as automotive parts, electronic parts, agricultural and forestry materials, building materials, and furniture compared to the past. Additionally, it can also be expected to be repurposed for filament materials for 3D printers, shaped bodies using such materials, etc.

[0031] Hereinafter, each layer will be described in detail.

[0032] (1) Reinforcing Layer 11

[0033] As shown in Figure 1 , the reinforcing layer 11 is a layer formed by a reinforcing fiber bundle (also referred to as "fiber bundle for fiber reinforcement") 112 impregnated with a thermoplastic resin 111. It should be noted that a substance formed by impregnating a reinforcing fiber with a thermoplastic resin is generally referred to as fiber reinforced thermoplastic resin (FRTP).

[0034] <Thermoplastic Resin 111 for Reinforcing Layer 11>

[0035] As the thermoplastic resin 111 serving as the matrix resin for the reinforcing layer 11, examples thereof include polyolefin resins such as polypropylene (PP), polyethylene (PE), and polyisobutylene (PB); polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PENp), and liquid crystal polyester (LCP); styrene resins such as polystyrene (PS), acrylonitrile-styrene resin (AS), acrylonitrile-butadiene-styrene resin (ABS), acrylonitrile-acrylic acid-styrene resin (AAS), and acrylonitrile-ethylene propylene rubber-styrene (AES); urethane resins, etc. In addition, other than these, polyvinyl alcohol (PVA), polyoxymethylene (POM), polyamide (PA), polycarbonate (PC), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyphenylene sulfide (PPS), polyphenylene ether (PPE), modified PPE, polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSU), modified PSU, polyethersulfone (PES), polyketone (PK), polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyarylate (PAR), polyether nitrile (PEN), etc. can also be cited. In addition, in the present invention, two or more of them can be used in combination.

[0036] In the present invention, any one or more selected from polycarbonate, acrylonitrile-styrene resin, polypropylene, and polyvinyl alcohol are particularly preferred, and polycarbonate and / or acrylonitrile-styrene resin are more preferred.

[0037] <Reinforcing fiber bundle 112>

[0038] As the reinforcing fiber bundle 112, a base material having a form of a continuous long fiber bundle or a fiber fabric (e.g., woven fabric, knitted fabric, braided fabric, etc.) is preferably used, for example. By using them, continuous impregnation properties and continuous formation properties of the coating layer 12 can be ensured, and a fiber-reinforced resin composite 1 having the coating layer 12 with excellent productivity can be manufactured.

[0039] As the fibers constituting the reinforcing fiber bundle 112, organic fibers such as olefin fibers, aramid fibers, and liquid crystal polyester (LCP) fibers; inorganic fibers such as glass fibers and carbon fibers; ceramic fibers such as Tyranno fibers; metal fibers such as boron fibers, copper, and stainless steel; amorphous fibers, etc. can be used, for example. In addition, in the present invention, blends thereof can also be used. In the present invention, glass fibers and / or carbon fibers are particularly preferably used among them.

[0040] As the glass fiber, for example, long fibers such as glass fiber monofilament, glass fiber strand, glass fiber roving, and glass fiber yarn (Japanese: ガラス繊維ヤーン) can be used. In the present invention, among these, glass fiber roving and / or glass fiber yarn are particularly preferably used. In addition, glass fiber woven fabrics such as glass fiber woven fabrics, glass fiber knitted fabrics, and glass fiber knitted fabrics can also be used.

[0041] It should be noted that the glass fiber can be surface treated with a surface treatment agent such as an epoxy silane coupling agent or an acrylic silane coupling agent. In addition, as the glass composition of the glass fiber, for example, E glass, S glass, C glass, etc. can be enumerated. In the present invention, E glass is particularly preferred among them. In addition, the cross section of the glass fiber monofilament can be roughly circular or roughly oval.

[0042] As the glass fiber roving, for example, a glass fiber bundle obtained by bundling 100 to 5000 glass fiber monofilaments having a diameter of 3 to 100 μm is preferably a bundle of 3 to 500 glass fiber strands.

[0043] There are three types of carbon fibers: "pitch-based" using coal tar pitch and petroleum pitch as raw materials, "PAN-based" using polyacrylonitrile as raw materials, and "rayon-based" using cellulose fibers as raw materials. In the present invention, any carbon fiber can be used.

[0044] The reinforcing fiber bundle 112 can be prepared by weaving, knitting or knitting into a desired length by a known method, or can be used by winding a long strip of material into a roll. In addition, the reinforcing fiber bundle 112 can also be heated to improve the impregnation of the resin into the reinforcing fibers and to remove moisture from the reinforcing fibers.

[0045] The volume content of the reinforcing fiber is preferably 20% to 80% of the entire reinforcing layer 11, and more preferably 40% to 60%. If the volume content is less than 20%, the reinforcing effect of the reinforcing fiber is reduced. On the contrary, if the volume content exceeds 80%, the amount of resin is small, which has an adverse effect on the bending strength.

[0046] <Twist in Reinforcement Layer 11>

[0047] Figure 2 1 is an enlarged view of one embodiment of the fiber-reinforced resin composite 1 (without the coating layer 12 ) of the present invention. Figure 2 II is a partial enlarged view of the AA section of I. Figure 2In I of, the composite 1 of the present invention is a left - and - right continuous composite, and its length is not particularly limited. In the present invention, the reinforcing layer 11 is in a state where SZ twist is imparted. That is, S twist (clockwise helix) and Z twist (counter - clockwise helix) are imparted, and the imparted S twist and Z twist are preferably formed at a certain period and at a specified twist angle.

[0048] Regarding the position where the twist is imparted, as long as it is the outlet of the impregnation tank, it can be any process, for example, it can be carried out by the process in the manufacturing method of the present invention described later. In addition, regarding the method of imparting the twist, it can also be based on the conventionally known methods and is not particularly limited.

[0049] In the present invention, the twist angle of the imparted SZ twist is characterized in that it is 180° or more and 720° or less. Thereby, a fiber - reinforced resin composite 1 with excellent flexural strength can be provided. In addition, the twist angle is preferably 180° or more and 450° or less, more preferably 180° or more and 405° or less, and further preferably 180° or more and 360° or less. By setting the twist angle to 180° or more and 450° or less, a fiber - reinforced resin composite 1 with not only excellent flexural strength but also excellent heat - resistant bending performance can be provided.

[0050] When imparting the twist, as the pitch width of the twist, it is preferably 800 mm or less, more preferably 500 mm or less, further preferably 300 mm or less, and particularly preferably 200 mm or less. If the pitch width of the twist is greater than 800 mm, due to the softening of the impregnated thermoplastic resin 111, buckling and whitening occur mainly due to the tension difference between the outer peripheral side and the inner peripheral side of the FRTP rod reinforcing fiber during bending. It should be noted that, as the lower limit value of the twist pitch width, for example, it is 50 mm or more, and from the viewpoint of operability, it is preferably 100 mm or more.

[0051] (2) Cladding layer 12

[0052] As Figure 1 shown, the fiber - reinforced resin composite 1 of the present invention is one or more layers that cover the outermost side of the above - mentioned reinforcing layer 11 with a thermoplastic resin. It should be noted that, in Figure 1 it depicts the case where the cladding layer 12 is 1 layer, but in the present invention, the cladding layer 12 can also be 2 layers or more. As the structure when the cladding layer 12 is 2 layers or more, for example, a structure can be cited in which a part or all of the first cladding layer 12 covering the reinforcing layer 11 is successively covered with a second or more cladding layer 12, etc.

[0053] <The thermoplastic resin used in the cladding layer 12>

[0054] Examples of the thermoplastic resin used as the coating layer 12 include polyolefin resins such as polypropylene (PP), polyethylene (PE), and polyisobutylene (PB); polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PENp), and liquid crystal polyester (LCP); styrene resins such as polystyrene (PS), acrylonitrile-styrene resin (AS), acrylonitrile-butadiene-styrene resin (ABS), acrylonitrile-acrylic acid-styrene resin (AAS), and acrylonitrile-ethylene propylene rubber-styrene (AES); urethane resins, etc. In addition, other examples include polyvinyl alcohol (PVA), polyoxymethylene (POM), polyamide (PA), polycarbonate (PC), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyphenylene sulfide (PPS), polyphenylene ether (PPE), modified PPE, polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSU), modified PSU, polyethersulfone (PES), polyketone (PK), polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyarylate (PAR), polyether nitrile (PEN), etc. In addition, in the present invention, two or more of them can be used in combination.

[0055] In the present invention, polycarbonate and / or polyolefin resin is particularly preferred among them. In addition, in the present invention, regarding the thermoplastic resin (the thermoplastic resin used in the coating layer 12) coating the outermost layer, it is preferably below the melting start of the thermoplastic resin 111 (the thermoplastic resin 111 used in the reinforcing layer 11) infiltrating into the reinforcing fiber bundle 112, or the melting start temperature of the thermoplastic resin coating the outermost layer is 200°C or lower. If the melting start temperature of the thermoplastic resin used in the coating layer 12 is higher than the melting start temperature of the matrix resin, the composite 1 of the reinforcing fiber and the thermoplastic resin will be softened during coating, which has an adverse effect on the physical properties. However, if the thermoplastic resin has a melting start temperature of 200°C or lower, even if it is above the melting start temperature of the matrix resin, it can be cooled in a short time, so it has almost no effect on the physical properties and thus does not cause adverse effects.

[0056] 2. Molded article using the fiber-reinforced resin composite 1

[0057] The molded article of the present invention is a fiber structure using the fiber-reinforced resin composite 1 of the present invention. For example, it may be a structure composed of at least one or more fabrics selected from non-woven fabrics, meshes, knitted fabrics, and woven fabrics thermally joined at the contacts between the resins. As the contacts between the above resins, for example, any one or more of the contacts between the thermoplastic resins used in the reinforcing layer 11 of the fiber-reinforced resin composite 1, the contacts between the thermoplastic resins used in the coating layer 12 of the fiber-reinforced resin composite 1, and the contacts between the thermoplastic resin used in the reinforcing layer 11 and the thermoplastic resin used in the coating layer 12 can be set. In addition, other nets, woven fabrics, knitted fabrics, non-woven fabrics, etc. can be laminated on the above fiber structure as needed. Further, the molded article of the present invention can be produced by impregnating the above fiber structure with resin and curing it.

[0058] 3. Manufacturing method of the fiber-reinforced resin composite 1

[0059] Figure 3 It is a diagram schematically showing the outline of the manufacturing method of the present invention. The manufacturing method of the present invention is the manufacturing method of the above-mentioned fiber-reinforced resin composite 1 of the present invention, and at least has a step of imparting an SZ twist with a twist angle of 180° or more and 720° or less. In addition, other steps can be carried out as needed.

[0060] Hereinafter, the manufacturing method of the present invention will be described in detail.

[0061] (1) Step of enabling the reinforcing fiber bundle 112 to be drawn

[0062] This step is not an essential step, but it can also be carried out in the manufacturing method of the present invention. Specifically, the required number of reinforcing fiber bundles 112 are pulled out from the creel 10, and the reinforcing fiber bundle 112 group is pulled out by passing the reinforcing fiber bundle 112 through an unheated preheating device (not shown) via a tension adjusting unit as needed, and through a cooling tank (not shown) not filled with cooling water, so that the reinforcing fiber bundle 112 group can be drawn by the drawing device 20.

[0063] (2) Step of imparting an SZ twist with a twist angle of 180° or more and 720° or less

[0064] In this process, after impregnating the reinforcing fiber bundle 112 with the thermoplastic resin, an SZ twist is imparted to the reinforcing fiber bundle 112 impregnated with the thermoplastic resin at a twist angle of 180° or more and 720° or less. Specifically, the traction device 20 is driven to traction the group of reinforcing fiber bundles 112 at a prescribed speed, and a prescribed tension is applied to each of the reinforcing fiber bundles 112 via the tension adjustment unit. Also, while heating the reinforcing fiber bundles 112 by raising the temperature of the preheating device, the melt extruder 30 is driven to supply the thermoplastic resin to the impregnation tank 40. In the impregnation tank 40, the molten thermoplastic resin is brought into contact with each of the reinforcing fiber bundles 112, and the thermoplastic resin is impregnated into each of the reinforcing fiber bundles 112. While adjusting the diameter using the throttle member in the impregnation tank 40, the reinforcing fiber bundles 112 are extruded in the form of a linear material under atmospheric pressure or under pressure. Then, an SZ twist is imparted to this linear material. It should be noted that the volume fraction of the reinforcing fibers in the entire reinforcing layer 11 to be produced can be appropriately and freely set by those skilled in the art by a conventionally known method. However, in the present invention, it is preferably 20% or more and 80% or less, and more preferably 40% or more and 60% or less.

[0065] (3) Reinforcing layer 11 production process

[0066] In this process, while imparting an SZ twist to the fiber-reinforced fiber bundle F impregnated with the thermoplastic resin 111, it is cooled to produce the reinforcing layer 11. Specifically, the twisted linear material is cooled by any one or more methods selected from air cooling, water cooling, or spraying to shape the twist and produce the reinforcing layer 11.

[0067] In this process, while imparting an SZ twist to the fiber-reinforced fiber bundle F impregnated with the thermoplastic resin 111, it is cooled. Therefore, compared with the case where a twist is imparted to the fiber-reinforced fiber bundle F before resin impregnation into the reinforcing fiber bundle 112, the twist can be shaped more efficiently. Generally, in the case of imparting a twist to the fiber-reinforced fiber bundle F, the processability such as winding of the fibers is poor. However, by shaping the twist after impregnating the thermoplastic resin 111 until it cures, the generation of voids can be prevented and a higher density can be achieved. It should be noted that in this process, a twisting machine can be used to further impart a twist.

[0068] (4) Cladding layer 12 production process

[0069] In this process, the outermost layer of the produced reinforcing layer 11 is coated with the thermoplastic resin to produce the cladding layer 12. Specifically, the melt extruder 30 is driven to supply the thermoplastic resin to the crosshead die, and the thermoplastic resin is brought into contact with the outermost layer of the reinforcing layer 11, and extrusion coating is performed under pressure to make it, for example, rod-shaped. Then, it is cooled and cured by a conventionally known method to produce the fiber-reinforced resin composite 1. AsFigure 3 As shown, the fabricated composite 1 of the present invention can be pulled as needed.

[0070] Example

[0071] Hereinafter, the present invention will be described in more detail based on examples.

[0072] It should be noted that the examples described below represent an example of a representative embodiment of the present invention, and the scope of the present invention is not narrowly construed thereby.

[0073] <Fabrication of Fiber Reinforced Resin Composite>

[0074] For Examples 1 to 5 and 7 to 9, fabrication was carried out according to the above manufacturing method. For Example 6, fabrication was carried out according to the above manufacturing method except that the step of fabricating the coating layer 12 was not performed. Additionally, for Comparative Example 1, fabrication was carried out according to the above manufacturing method except that SZ twist was not performed. For Comparative Example 2, fabrication was carried out according to the above manufacturing method except that S twist was performed instead of SZ twist. For Comparative Example 3, fabrication was carried out according to the above manufacturing method except that Z twist was performed instead of SZ twist.

[0075] The volume fraction, twist direction, twist pitch of the reinforcing fiber (bundle), and the resin type used in fabrication for each example and each comparative example are shown in Table 1 or Table 2 below.

[0076] <Evaluation Method>

[0077] Three-point bending tests and heat-resistant bending tests were conducted on each fabricated fiber reinforced resin composite.

[0078] [Three-point Bending Test]

[0079] For each fiber reinforced resin composite cut to a length of 100 mm (N = 5), a three-point bending test was conducted using a universal testing machine under the conditions that the distance between the fulcrums was the diameter of the fiber reinforced resin composite (without coating layer) × 20 mm and the speed was 5.0 mm / min, and the average value of N = 5 was taken as the measured value.

[0080] It should be noted that in the present invention, when the shape of the fiber reinforced resin composite (without coating layer) is a polygonal tubular shape, the above diameter is defined as the diameter of the circumscribed circle in its cross-section.

[0081] As an evaluation method, the obtained measured value was compared with the following evaluation.

[0082] 400N ≤ F: A

[0083] 350N ≤ F < 400N: B

[0084] 300N ≤ F < 350N: C

[0085] 250N ≤ F < 300N: D

[0086] F < 250: E

[0087] [Heat resistance bending test]

[0088] For the specimen, both end portions are fixed with a diameter 40 times (40D) the diameter of the fiber-reinforced resin composite (without coating layer) to obtain a semi-circle. Five such specimens are placed in a dry heat furnace at 80 °C for 48 hours, and it is evaluated whether buckling or bending occurs.

[0089] It should be noted that in the present invention, as described above, when the shape of the fiber-reinforced resin composite (without coating layer) is a polygonal tubular shape, the above-mentioned diameter is defined as the diameter of the circumscribed circle in its cross-section. In addition, the above-mentioned semi-circle is defined as a semi-circle with a diameter 40 times that of the above-mentioned circumscribed circle.

[0090] As an evaluation method, the state of each obtained fiber-reinforced resin composite is compared with the following evaluation.

[0091] No buckling (bending, whitening, etc.): A

[0092] No buckling, but there is bending and whitening: B

[0093] There is buckling: C

[0094] <Evaluation result>

[0095] Each evaluation result is shown in Tables 1 and 2 below.

[0096]

[0097]

[0098] <Consideration>

[0099] It can be seen that the fiber-reinforced resin composites of Examples 1 to 9 have excellent bending strength compared with the fiber-reinforced resin composites of Comparative Examples 1 to 3. Furthermore, it can be seen that the heat resistance bending performance is also excellent. Therefore, it can be known that by at least having a reinforcing layer formed of a reinforcing fiber bundle impregnated with a thermoplastic resin, and the above-mentioned reinforcing layer is given an SZ twist, the twist angle of the above-mentioned SZ twist is 180° or more and 720° or less, whereby the directionality in the longitudinal direction of the fiber-reinforced resin composite changes from one direction to the isotropic side, and thus a fiber-reinforced resin composite with excellent bending strength can be provided.

[0100] Industrial applicability

[0101] According to the present invention, it is possible to provide a fiber-reinforced resin composite having excellent flexural strength and a method for manufacturing the same. Therefore, the composite of the present invention has excellent flexural strength, and thus as a material to replace metal articles, it can be expected to be used in a wider range of fields such as automotive parts, electronic parts, agricultural and forestry materials, building materials, furniture, etc. compared with the prior art. In addition, it can also be expected to be diverted to filament materials for 3D printers, molded articles using such materials, etc.

[0102] Explanation of reference numerals

[0103] 1: Fiber-reinforced resin composite

[0104] 11: Reinforcing layer

[0105] 111: Thermoplastic resin (matrix resin) used in the reinforcing layer 11

[0106] 112: Fiber bundle for reinforcement

[0107] 12: Coating layer

[0108] 10: Yarn stand

[0109] 20: Traction device

[0110] 30: Melt extruder

[0111] 40: Impregnation tank

Claims

1. A fiber-reinforced resin composite, which at least has a reinforcing layer formed of a reinforcing fiber bundle impregnated with a thermoplastic resin, wherein the reinforcing layer is given an SZ twist, and the twist angle of the SZ twist is 180° or more and 720° or less.

2. The fiber-reinforced resin composite according to claim 1, wherein, The pitch width of the SZ twist is 800 mm or less.

3. The fiber-reinforced resin composite according to claim 1 or 2, which further has one or more coating layers that coat the outermost layer of the reinforcing layer with a thermoplastic resin.

4. A molded article that uses the fiber-reinforced resin composite according to claim 1 or 3.

5. A method for manufacturing a fiber-reinforced resin composite, which at least has a step of giving an SZ twist with a twist angle of 180° or more and 720° or less, wherein the fiber-reinforced resin composite at least has a reinforcing layer formed of a reinforcing fiber bundle impregnated with a thermoplastic resin, the reinforcing layer is given an SZ twist, and the twist angle of the SZ twist is 180° or more and 720° or less.

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