Reinforcing fiber resin composite material

Abstract

To provide a reinforcing fiber resin composite material in which a core material layer comprising reinforcing fibers and a thermoplastic resin layer are laminated, wherein the overall coefficient of linear expansion is reduced by suppressing the influence of the coefficient of linear expansion of the core material layer.SOLUTION: A reinforcing fiber resin composite material 30 comprises two thermoplastic resin sheet layers 41 having a thermoplastic resin and an intermediate fiber sheet layer 31 as a core material layer comprising a fiber sheet having reinforcing fibers that are carbon fibers or glass fibers, and has a laminated structure in which the intermediate fiber sheet layer 31 is sandwiched between the two thermoplastic resin sheet layers 41. Each thermoplastic resin sheet layer 41 comprises 1 mass% or more and 50 mass% or less of a fibrous body 43 of carbon fiber or glass fiber with respect to the total amount of each of the thermoplastic resin sheet layers 41, wherein the fiber length in the fibrous body is 50 μm or more and 9 mm or less, and the fiber diameter is 5 μm or more and 30 μm or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a reinforced fiber resin composite having a thermoplastic resin sheet layer containing a thermoplastic resin and a fiber sheet layer as a core layer having a fiber sheet containing reinforcing fibers that are carbon fibers or glass fibers. [Background technology]

[0002] Polyvinyl chloride (PVC) has traditionally been used as a material for forming components, at least a portion of which is placed outdoors, such as gutters and resin sashes. However, because PVC has a large linear expansion coefficient, when it is used in components, such as gutters and resin sashes, that are at least a portion of which is placed outdoors and are used in environments where the ambient temperature changes greatly, there is a possibility that thermal expansion and contraction will cause disconnection at the joints or large dimensional changes. For this reason, reinforced fiber resin composites, which are formed by laminating a core layer containing reinforcing fibers and a thermoplastic resin layer, have been considered.

[0003] Patent Document 1 describes a gutter constructed from a reinforced fiber resin composite material in which a thermoplastic resin covering layer is provided around the outer periphery of a sheet-shaped core material. The sheet-shaped core material is embedded in the thermoplastic resin layer with the reinforcing fibers oriented in the longitudinal direction. The sheet-shaped core material in the portion forming the gutter ears has a higher reinforcing fiber content than the portion forming the gutter body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-174621 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a structure in which a core layer containing reinforcing fibers and a thermoplastic resin layer are laminated, such as the reinforced fiber resin composite described in Patent Document 1, the linear expansion coefficient may become large due to the influence of the linear expansion coefficient of the core layer.

[0006] The object of the present disclosure is to suppress the influence of the linear expansion coefficient of the core material layer in a reinforced fiber resin composite material in which a core material layer containing reinforcing fibers and a thermoplastic resin layer are laminated, thereby reducing the overall linear expansion coefficient. [Means for solving the problem]

[0007] A reinforced fiber resin composite according to one embodiment of the present disclosure is a composite material having a laminated structure comprising two thermoplastic resin sheet layers having a thermoplastic resin and an intermediate fiber sheet layer serving as a core layer including a fiber sheet having reinforcing fibers of carbon fiber or glass fiber, with the intermediate fiber sheet layer sandwiched between the two thermoplastic resin sheet layers, wherein each of the two thermoplastic resin sheet layers contains fibrous bodies of carbon fiber or glass fiber in an amount of 1% by mass to 50% by mass relative to the total amount of each thermoplastic resin sheet layer, and the fiber length in the fibrous bodies is 50 μm to 9 mm, and the fiber diameter is 5 μm to 30 μm. [Effects of the Invention]

[0008] According to one embodiment of the present disclosure, the composite material is a laminate of an intermediate fiber sheet layer serving as a core layer containing reinforcing fibers and a thermoplastic resin sheet layer, in which the intermediate fiber sheet layer is sandwiched between the two thermoplastic resin sheet layers, and each thermoplastic resin sheet layer contains carbon fiber or glass fiber fibrous material in an amount of 1% by mass to 50% by mass relative to the total amount of the thermoplastic resin sheet layer, with the fiber length and fiber diameter being regulated within appropriate ranges. This suppresses the effect of the linear expansion coefficient of the intermediate fiber sheet layer on the composite material, thereby reducing the overall linear expansion coefficient. [Brief explanation of the drawings]

[0009] [Figure 1]1 is a perspective view showing an example of a rainwater drainage structure in which a reinforced fiber resin composite material according to an embodiment is used. [Figure 2] 1 is a cross-sectional view of a reinforced fiber resin composite material according to an embodiment. [Figure 3] 1 is a schematic diagram illustrating a molding method for a reinforced fiber resin composite material according to an embodiment. [Figure 4] FIG. 1 is a diagram showing the measurement results of the linear expansion coefficient of Examples 1 and 2 in which the type of thermoplastic resin sheet layer was changed in a reinforced fiber resin composite material according to an embodiment. [Figure 5] FIG. 10 is a cross-sectional view of another example of a reinforced fiber resin composite material according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the reinforced fiber resin composite according to the present disclosure will be described with reference to the drawings. It should be noted that when multiple embodiments or variations are included below, it is assumed from the outset that new embodiments can be constructed by appropriately combining their characteristic features. The shapes, arrangements, numbers, values, materials, etc. described below are examples for explanatory purposes and can be changed as appropriate depending on the specifications of the valley gutter repair component. In the following description, the same symbols are used for equivalent elements in all drawings.

[0011] An embodiment will be described with reference to Figures 1 to 3. Figure 1 is a perspective view showing an example of a rainwater drainage structure 10 in which a reinforced fiber resin composite material of an embodiment is used.

[0012] The rainwater drainage structure 10, which uses a reinforced fiber resin composite material, comprises an eave gutter 12 attached to the eaves of the roof of a building (not shown), a drain 20 connected to a longitudinal portion of the eave gutter 12, and a downspout 24 connected to the drain 20 via a first elbow 21, a call gutter 22, and a second elbow 23. The eave gutter 12 extends in the left-right direction and has a cross-sectional groove shape in which the lower ends of a front wall 13 and a rear wall (not shown), which are separated in the front-to-rear direction, are connected by a bottom plate 15, and both left-to-right ends are closed by end walls 16.

[0013] The eaves gutter 12 is suspended, for example, by a hanging device (not shown) attached to the building, and is attached to the eaves of the roof so as to catch rainwater running down from the roof. A drain hole (not shown) is formed in a portion of the length of the bottom plate 15 of the eaves gutter 12, and a first elbow 21 is connected to the drain hole via a drain 20. A downspout 24 extends vertically near the exterior wall surface of the building and discharges rainwater downward. Rainwater running down from the roof into the eaves gutter 12 is sent downward through the drain 20, first elbow 21, downspout 22, second elbow 23, and downspout 24, and is then sent to a catch basin (not shown) via a drain pipe buried underground.

[0014] In the rainwater drainage structure 10 described above, components such as the eaves gutter 12, the main gutter 22, and the downspout 24 can be formed from a reinforced fiber resin composite. FIG. 2 is a cross-sectional view of a reinforced fiber resin composite 30. Hereinafter, the reinforced fiber resin composite 30 will be referred to as the composite 30. As shown in FIG. 2, the composite 30 has a laminated structure in which an intermediate fiber sheet layer 31 serving as a core layer is sandwiched between two thermoplastic resin sheet layers 41.

[0015] Each thermoplastic resin sheet layer 41 contains a thermoplastic resin and includes fibrous bodies 43 of carbon fiber or glass fiber. The fibrous bodies 43 are preferably oriented in the same direction. In each thermoplastic resin sheet layer 41, the fibrous bodies 43 account for 1% by mass or more and 50% by mass or less of the total amount of the thermoplastic resin sheet layer 41. For example, in the thermoplastic resin sheet layer 41 on one side in the stacking direction (upper side in FIG. 2), the fibrous bodies 43 account for 1% by mass or more and 50% by mass or less of the total amount of the thermoplastic resin sheet layer 41 on one side. In the thermoplastic resin sheet layer 41 on the other side in the stacking direction (lower side in FIG. 2), the fibrous bodies 43 account for 1% by mass or more and 50% by mass or less of the total amount of the thermoplastic resin sheet layer 41 on the other side.

[0016] The fiber length of the fibrous bodies 43 in the thermoplastic resin sheet layer 41 is 50 μm or more and 9 mm or less, and the fiber diameter is 5 μm or more and 30 μm or less. When the fibrous bodies 43 in the thermoplastic resin sheet layer 41 are carbon fibers, the thermoplastic resin sheet layer 41 preferably contains 1 mass % or more and 20 mass % or less of carbon fibers relative to the total amount of the thermoplastic resin sheet layer 41, and more preferably contains 5 mass % or more and 10 mass % or less of carbon fibers relative to the total amount of the thermoplastic resin sheet layer 41.

[0017] Furthermore, when the fibrous body 43 in the thermoplastic resin sheet layer 41 is glass fiber, it is preferable that the thermoplastic resin sheet layer 41 contains glass fiber in an amount of 1% by mass or more and 40% by mass or less, and it is more preferable that the thermoplastic resin sheet layer 41 contains glass fiber in an amount of 10% by mass or more and 30% by mass or less, relative to the total amount of the thermoplastic resin sheet layer 41.

[0018] The intermediate fiber sheet layer 31 includes a fiber sheet having reinforcing fibers, which are carbon fibers or glass fibers. The diameter of the reinforcing fibers included in the intermediate fiber sheet layer 31 is, for example, 5 μm or more and 30 μm or less, and more preferably 5 μm or more and 15 μm or less. The carbon fibers and glass fibers can be used alone or in combination as rovings, continuous fibers in the form of yarns, woven fabrics, etc. The reinforcing fibers of the fiber sheet may be oriented in the longitudinal direction.

[0019] The thickness of each thermoplastic resin sheet layer 41 is preferably 0.1 mm or more and 2.0 mm or less. The thickness of the intermediate fiber sheet layer 31 is preferably 0.01 mm or more and 3.0 mm or less. The intermediate fiber sheet layer 31 and the thermoplastic resin sheet layer 41 are preferably joined together without using an adhesive.

[0020] For example, the intermediate fiber sheet layer 31 may be configured such that the fiber sheet contained in the intermediate fiber sheet layer 31 is impregnated with the same type of thermoplastic resin as the thermoplastic resin of the thermoplastic resin sheet layer 41 .

[0021] The thermoplastic resin of the thermoplastic resin sheet layer 41 can be polyvinyl chloride (PVC). This thermoplastic resin may contain polypropylene (PP) or polyethylene (PE) instead of PVC.

[0022] FIG. 3 shows an example of a method for molding the composite material 30. As shown in FIG. 3, first, a thermoplastic resin sheet layer 41 is molded. At this time, the thermoplastic resin sheet layer 41 is molded using, for example, a twin-screw extruder 50. In the extruder 50, a powdered thermoplastic resin, a filler-like fiber, and additives such as a compatibilizer are mixed and fed into the cylinder of the extruder 50. The softened and molten resin is extruded from the cylinder by the rotation of the screw, and then extruded from the lower end of a wide mold 52 called a T-die. After being stretched by a roll (not shown), the resin is cooled and wound up on a take-up roll. This results in a wound-up thermoplastic resin sheet layer 41 containing carbon fiber or glass fiber in an amount of 1% by mass to 50% by mass of the total amount of the thermoplastic resin sheet layer 41. The fiber is embedded in the thermoplastic resin so that the fiber length is 50 μm to 9 mm and the fiber diameter is 5 μm to 30 μm.

[0023] The thermoplastic resin sheet layer 41 in a rolled form is wound around two outer unwinding rollers 54, and an intermediate unwinding roller 56 is disposed between the two outer unwinding rollers. An intermediate fiber sheet layer 31 is wound around the intermediate unwinding roller 56. The intermediate fiber sheet layer 31 is a core layer including a fiber sheet having reinforcing fibers such as carbon fiber or glass fiber, and is preferably impregnated with the same type of thermoplastic resin as the thermoplastic resin of the thermoplastic resin sheet layer 41. When the intermediate fiber sheet layer 31 is sandwiched between the two thermoplastic resin sheet layers 41, this impregnated thermoplastic resin serves to bond the three sheet layers 31, 41 together without using an adhesive specifically for bonding the sheet layers together.

[0024] The intermediate fiber sheet layer 31 can be formed, for example, by spreading a fiber bundle of reinforcing fibers in a thin layer using a fiber spreading device, sandwiching the spread fiber bundle between two thermoplastic resin films, heating the sandwiched fiber bundle between pressure rollers, and extruding the sandwiched fiber bundle between pressure rollers, thereby impregnating the fiber sheet with a thermoplastic resin. The intermediate fiber sheet layer 31 is not limited to this molding method, and may be formed, for example, by dipping a fiber sheet made of glass mat, glass nonwoven fabric, glass cloth, or the like into a liquid thermoplastic resin such as PVC to impregnate the resin, and then heating and solidifying the resin. The intermediate fiber sheet layer 31 may also be formed as a simple glass sheet, in which the glass sheet, which is a fiber sheet made of the above-mentioned glass fibers, is not impregnated with a thermoplastic resin such as PVC.

[0025] When forming the composite material 30 (FIG. 2), as shown in FIG. 3, the thermoplastic resin sheet layer 41 unwound from two outer unwinding rollers 54 and the intermediate fiber sheet layer 31 unwound from an intermediate unwinding roller 56 are supplied between two pressure rollers 58 having heating units. Then, the intermediate fiber sheet layer 31 sandwiched between the two thermoplastic resin sheet layers 41 is pressed in a heated state between the two pressure rollers 58. Then, the laminate of the thermoplastic resin sheet layer 41 and the intermediate fiber sheet layer 31 extruded from between the two pressure rollers 58 is cooled, and formed into the sheet-like composite material 30.

[0026] According to the above-described composite material 30, in the composite material 30 in which an intermediate fiber sheet layer 31 serving as a core material layer containing reinforcing fibers and a thermoplastic resin sheet layer 41 are laminated, the intermediate fiber sheet layer 31 is sandwiched between the two thermoplastic resin sheet layers 41, and each thermoplastic resin sheet layer 41 contains fibrous bodies 43 of carbon fiber or glass fiber in an amount of 1% by mass to 50% by mass relative to the total amount of the thermoplastic resin sheet layer 41. Furthermore, the fiber length and fiber diameter of the fibrous bodies 43 are regulated within appropriate ranges. This suppresses the influence of the linear expansion coefficient of the intermediate fiber sheet layer 31 on the composite material 30, thereby reducing the overall linear expansion coefficient.

[0027] If the proportion of the fibrous body 43 in each thermoplastic resin sheet layer 41 is less than 1 mass %, the effect of reducing the linear expansion coefficient is insufficient. On the other hand, if the proportion of the fibrous body 43 in each thermoplastic resin sheet layer 41 exceeds 50 mass %, molding of each thermoplastic resin sheet layer 41 becomes difficult.

[0028] The present disclosure will be further described below with reference to examples, but is not limited to these examples. Fig. 4 shows the measurement results of the linear expansion coefficients of Examples 1 and 2, in which the type of thermoplastic resin sheet layer 41 in the reinforced fiber resin composite 30 of the embodiment was changed.

[0029] Example 1 The intermediate fiber sheet layer 31 has a linear expansion coefficient of 3.8×10 in the unwinding direction. (-5) Glass cloth, a glass fiber fabric, was used. The glass cloth is a fiber fabric composed of a plurality of warp threads and a plurality of weft threads, each of which is a plurality of glass fibers. As described above, the intermediate fiber sheet layer 31 was formed by dipping a sheet made of glass cloth into liquid PVC to impregnate it, and then heating and solidifying it. At this time, the thickness of each intermediate fiber sheet layer was 0.05 mm or more and 3.00 mm or less before impregnation with PVC, and 0.10 mm or more and 3.50 mm or less after impregnation with PVC.

[0030] Polyvinyl chloride (PVC) containing 10 mass % of carbon fiber fibrous bodies relative to the total amount of the thermoplastic resin sheet layer 41 was used as the thermoplastic resin sheet layer 41. The thermoplastic resin sheet layer 41 was formed into a sheet by kneading the PVC and the fibrous bodies of each carbon fiber in a twin-screw extruder. The linear expansion coefficient of the thermoplastic resin sheet layer 41 in the unwinding direction was 1.8 × 10 (-5) / K, and the thickness of one thermoplastic resin sheet layer 41 was 0.1 mm or more and 2.0 mm or less. At this time, the fiber length of the carbon fiber fibrous body was 50 μm or more and 9 mm or less, and the fiber diameter was 5 μm or more and 30 μm or less.

[0031] The intermediate fiber sheet layer 31 was sandwiched between two thermoplastic resin sheet layers 41 and pressed under heat by pressure rollers to be extruded, and after cooling, the composite material 30 was cut to a predetermined size to form a sheet-like composite material 30. The thickness of the composite material 30 was 0.4 mm or more and 5.0 mm or less.

[0032] <Example 2> Polyvinyl chloride (PVC) containing 30 mass % of glass fiber fibrous bodies relative to the total amount of the thermoplastic resin sheet layer 41 was used as the thermoplastic resin sheet layer 41. The thermoplastic resin sheet layer 41 was formed into a sheet by kneading PVC and the fibrous bodies of each glass fiber in a twin-screw extruder. The linear expansion coefficient of the thermoplastic resin sheet layer 41 in the unwinding direction was 1.5 × 10 (-5) / K, and the thickness of one thermoplastic resin sheet layer 41 was 0.1 mm or more and 2.0 mm or less. At this time, the fiber length of the glass fiber fibrous body was 50 μm or more and 9 mm or less, and the fiber diameter was 5 μm or more and 30 μm or less.

[0033] The intermediate fiber sheet layer 31 was sandwiched between two thermoplastic resin sheet layers 41 and pressed under heat by pressure rollers to be extruded, and after cooling, the composite material 30 was cut to a predetermined size to form a sheet-like composite material 30. The thickness of the composite material 30 was 0.4 mm or more and 5.0 mm or less. The other configurations of Example 2 were the same as those of Example 1.

[0034] <Measurement results> 4 shows the measurement results of the linear expansion coefficients of the intermediate fiber sheet layer 31, the thermoplastic resin sheet layer 41, and the composite material 30 in each of Examples 1 and 2. The linear expansion coefficient of the composite material 30 was evaluated as a value in the extrusion direction during extrusion molding.

[0035] From the results shown in FIG. 4, in Example 1, the linear expansion coefficient of the intermediate fiber sheet layer 31 was 3.8×10 (-5) / K, the linear expansion coefficient of Composite 30 is 1.8 × 10 (-5) / K, which was the same as the linear expansion coefficient of the thermoplastic resin sheet layer 41 alone.(-5) / K, the linear expansion coefficient of Composite 30 is 1.6 × 10 (-5) / K, which is approximately the same coefficient of linear expansion as that of the thermoplastic resin sheet layer 41 alone. This is thought to be because the intermediate fiber sheet layer 31 is sandwiched between two thermoplastic resin sheet layers 41, each of which contains 1% by mass to 50% by mass of carbon fiber or glass fiber fibrous material relative to the total amount of the thermoplastic resin sheet layer 41, and the fiber length and fiber diameter of the fibrous material are regulated to an appropriate range. This confirmed the effect of the embodiment.

[0036] FIG. 5 is a cross-sectional view of a composite material 30a according to another embodiment. The composite material 30a of this embodiment includes two thermoplastic resin sheet layers 41 sandwiching an intermediate fiber sheet layer 31a. The intermediate fiber sheet layer 31a has a laminated structure in which two fiber sheets 32 containing reinforcing fibers, such as carbon fiber or glass fiber, are laminated. The fiber sheets 32 are formed separately from each other. For example, the fiber sheets 32 have approximately the same thickness. Each fiber sheet 32 ​​is then unwound from a winding roller and sandwiched between two thermoplastic resin sheet layers 41 unwound from other winding rollers. The fiber sheet 32 ​​is then heated and pressurized between pressure rollers, extruded, cooled, and cut to a predetermined size to form a sheet-like composite material 30. As with the embodiment shown in FIGS. 1 to 3, the intermediate fiber sheet layer 31a constituting the composite material 30 is preferably impregnated with the same type of thermoplastic resin as the thermoplastic resin of the thermoplastic resin sheet layer 41.

[0037] According to the configuration of this example, the intermediate fiber sheet layer 31a has a laminated structure of multiple fiber sheets 32, which further reduces the linear expansion coefficient of the composite material 30a. This is thought to be because, compared to when the intermediate fiber sheet layer 31a is composed of only a single fiber sheet, the laminated structure compensates for fiber irregularities and defects in the individual sheets, thereby improving physical properties. Furthermore, the intermediate fiber sheet layer 31a is made up of multiple fiber sheets 32, which increases the overall thickness and rigidity of the composite material 30a. This makes it less likely to bend and twist, which is thought to reduce thermal expansion and contraction in the longitudinal direction corresponding to the extrusion direction during extrusion molding.

[0038] The thickness of the intermediate fiber sheet layer 31a is preferably in the range of 0.05 to 5.0 times the thickness of the outer thermoplastic resin sheet layer 41 alone. In Fig. 5, the intermediate fiber sheet layer 31 has a laminated structure of two fiber sheets 32, but the intermediate fiber sheet layer may have a laminated structure of three or more fiber sheets. In this example, the other configurations and functions are the same as those in Figs. 1 to 3.

[0039] The above composite material is not limited to use in components such as eaves gutters that constitute rainwater drainage structures, but can also be used to form resin sashes, for example.

[0040] The present disclosure is further illustrated by the following embodiments. Configuration 1: The laminated structure is provided with two thermoplastic resin sheet layers each having a thermoplastic resin, and an intermediate fiber sheet layer as a core layer including a fiber sheet having reinforcing fibers which are carbon fibers or glass fibers, A reinforced fiber resin composite material having a laminated structure in which the intermediate fiber sheet layer is sandwiched between two of the thermoplastic resin sheet layers, Each of the two thermoplastic resin sheet layers contains fibrous bodies of carbon fiber or glass fiber in an amount of 1% by mass or more and 50% by mass or less relative to the total amount of each of the thermoplastic resin sheet layers, The fiber length of the fibrous body is 50 μm or more and 9 mm or less, and the fiber diameter is 5 μm or more and 30 μm or less. Reinforced fiber resin composite material. Configuration 2: The diameter of the reinforcing fibers contained in the intermediate fiber sheet layer is 5 μm or more and 30 μm or less, The thickness of one of the thermoplastic resin sheet layers is 0.1 mm or more and 2.0 mm or less, The thickness of the intermediate fiber sheet layer is 0.01 mm or more and 3.0 mm or less, The intermediate fiber sheet layer and the thermoplastic resin sheet layer are bonded together without using an adhesive. 2. The reinforced fiber resin composite of claim 1. Configuration 3: the thermoplastic resin of the thermoplastic resin sheet layer is a vinyl chloride resin; 3. The reinforced fiber resin composite according to claim 1 or 2. Configuration 4: The intermediate fiber sheet layer is formed by impregnating the fiber sheet with the same type of thermoplastic resin as the thermoplastic resin of the thermoplastic resin sheet layer. 4. The reinforced fiber resin composite according to claim 2 or 3. Configuration 5: The intermediate fiber sheet layer has a laminated structure of a plurality of the fiber sheets. 5. The reinforced fiber resin composite of any one of Configurations 1 to 4. [Explanation of symbols]

[0041] 10 rainwater drainage structure, 12 eaves gutter, 13 front wall, 15 bottom plate, 16 end wall, 20 drain, 21 first elbow, 22 main gutter, 23 second elbow, 24 downspout, 30, 30a reinforced fiber resin composite (composite material), 31, 31a intermediate fiber sheet layer, 32 fiber sheet, 41 thermoplastic resin sheet layer, 50 extruder, 52 mold, 54 outer unwinding roller, 56 intermediate unwinding roller, 58 pressure roller.

Claims

1. The vehicle is provided with two thermoplastic resin sheet layers containing a thermoplastic resin, and an intermediate fiber sheet layer as a core material layer containing a fiber sheet having reinforcing fibers which are carbon fibers or glass fibers, A reinforced fiber resin composite material having a laminated structure in which the intermediate fiber sheet layer is sandwiched between two of the thermoplastic resin sheet layers, Each of the two thermoplastic resin sheet layers contains fibrous bodies of carbon fiber or glass fiber in an amount of 1% by mass or more and 50% by mass or less relative to the total amount of each of the thermoplastic resin sheet layers, The fiber length of the fibrous body is 50 μm or more and 9 mm or less, and the fiber diameter is 5 μm or more and 30 μm or less. Reinforced fiber resin composite material.

2. The diameter of the reinforcing fibers contained in the intermediate fiber sheet layer is 5 μm or more and 30 μm or less, The thickness of one of the thermoplastic resin sheet layers is 0.1 mm or more and 2.0 mm or less, the thickness of the intermediate fiber sheet layer is 0.01 mm or more and 3.0 mm or less; The intermediate fiber sheet layer and the thermoplastic resin sheet layer are bonded together without using an adhesive. The reinforced fiber resin composite material according to claim 1.

3. the thermoplastic resin of the thermoplastic resin sheet layer is polyvinyl chloride; The reinforced fiber resin composite material according to claim 2.

4. The intermediate fiber sheet layer is formed by impregnating the fiber sheet with the same type of thermoplastic resin as the thermoplastic resin of the thermoplastic resin sheet layer. The reinforced fiber resin composite material according to claim 2.

5. The intermediate fiber sheet layer has a laminated structure of a plurality of the fiber sheets. The reinforced fiber resin composite material according to claim 2.

Images