Fiber-reinforced thermoplastic moldings and manufacturing method thereof, and manufacturing method of composite

Abstract

To provide a manufacturing method of a fiber-reinforced thermoplastic molding with improved bond strength of a fiber-reinforced thermoplastics as well as excellent productivity.SOLUTION: A manufacturing method of a fiber-reinforced thermoplastic molding including a bonding region for bonding with other material includes an arrangement step of arrangement of a fiber sheet on a surface of an intermediate material including a fiber substrate and a thermoplastic resin and a molding step of hot press molding the intermediate material with the fiber sheet to obtain a fiber-reinforced thermoplastic molding having at least a part of the fiber sheet impregnated with the thermoplastic resin, wherein in the molding step, a bonding region comprising an uneven surface of the fiber sheet is formed on a surface of the fiber-reinforced thermoplastic molding with the fiber sheet having been arranged.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a fiber-reinforced thermoplastic plastic molded article, a method for producing the same, and a method for producing a composite body. [Background technology]

[0002] In recent years, many attempts have been made to achieve carbon neutrality, which balances the emissions and absorption of greenhouse gases such as carbon dioxide, and one approach that has attracted attention is energy conservation through weight reduction of automobiles, etc. Specifically, as a method for reducing the weight of automobiles, etc., development is underway on multi-material technology, in which heavy materials such as steel and lightweight materials such as aluminum alloys and carbon fiber reinforced plastics (CFRP) are used in the right places and bonded together to form an entire automobile.

[0003] Generally, there is a strong demand for the recyclability and productivity of materials used in the production of automobiles, etc. For this reason, the use of carbon fiber reinforced thermoplastics (CFRTP) with polypropylene resin (PP) resin or nylon resin (PA6) as a matrix material for CFRP, which is used as a lightweight material, is being considered.

[0004] However, thermoplastics such as polypropylene resin (PP) and nylon resin (PA6) are poorly adhesive materials, and there was a problem in that it was difficult to ensure adhesive strength with other materials such as steel.

[0005] Various methods have been developed to solve this problem.Specifically, for example, a method of imparting an uneven shape to the surface by shot blasting or laser processing to cause an anchor effect (e.g., Patent Document 1) and a method of strengthening the chemical bond with the adhesive by applying a primer composition to the bonding surface (e.g., Patent Document 2) have been proposed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6822699 [Patent Document 2] Patent Publication No. 2023-46845 Summary of the Invention [Problem to be solved by the invention]

[0007] However, although the methods disclosed in Patent Documents 1, 2, etc. can improve the adhesive strength of fiber-reinforced thermoplastics to other materials such as steel to a certain extent, they require an increased number of work steps, and therefore it was thought that there was room for improvement in terms of productivity.

[0008] The present invention has been made in consideration of the above circumstances, and has an object to provide a method for producing a fiber-reinforced thermoplastic molded body that improves the adhesive strength of the fiber-reinforced thermoplastic plastic while also being excellent in productivity, and a fiber-reinforced thermoplastic molded body having excellent adhesive strength obtained by the method. Another object of the present invention is to provide a method for producing a composite in which the fiber-reinforced thermoplastic molded body and another material are bonded with excellent adhesive strength. [Means for solving the problem]

[0009] In order to solve the above problems, the following fiber-reinforced thermoplastic plastic molded article, a method for producing the same, and a method for producing a composite are provided. [1] A method for producing a fiber-reinforced thermoplastic molded article having an adhesive region for bonding to other materials, comprising the steps of: A step of disposing a fiber sheet on a surface of an intermediate material including a fiber substrate and a thermoplastic resin; and A molding step of hot pressing the intermediate material and the fiber sheet to obtain a fiber-reinforced thermoplastic molded body in which at least a portion of the fiber sheet is impregnated with the thermoplastic resin. Including, In the molding step, the bonding area having an uneven surface due to the fiber sheet is formed on the surface of the fiber reinforced thermoplastic molded body on which the fiber sheet is arranged, A method for producing a fiber-reinforced thermoplastic plastic molding. [2] After the placing step, the surface of the fiber sheet is coated with a resin-absorbing material; In the molding step, after the thermocompression molding, the resin-absorbent material is removed from the surface of the fiber sheet to expose the uneven surface formed by the fiber sheet. Including, The method for producing the fiber-reinforced thermoplastic plastic molding according to [1] above. [3] The method includes a bonding step of bonding another material to the bonding region of the fiber-reinforced thermoplastic plastic molded body obtained by the manufacturing method of [1]. A method for producing the composite. [4] A fiber-reinforced thermoplastic molded body including an intermediate material containing a fiber base material and a thermoplastic resin as a raw material and having an adhesive region for bonding to other materials, A fiber sheet is provided on the surface of the fiber reinforced thermoplastic molded body, At least a portion of the fiber sheet is impregnated with the thermoplastic resin, and the bonding region having an uneven surface formed by the fiber sheet is formed on the surface, The uneven surface of the bonding region has a surface roughness Ra of 2.1 or more and a surface roughness RΔq of 0.15 or more. Fiber-reinforced thermoplastic moldings. [5] The fibers of the fiber sheet are cellulose fibers. The fiber-reinforced thermoplastic plastic molding according to [4] above. Effect of the Invention

[0010] According to the method for producing a fiber-reinforced thermoplastic plastic molded article of the present invention, it is possible to improve the adhesive strength with other materials and to improve productivity. The fiber-reinforced thermoplastic plastic molded article of the present invention has excellent adhesive strength with other materials. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram illustrating one embodiment of a fiber-reinforced thermoplastic plastic molded body of the present invention. [Diagram 2] FIG. 2 is a schematic diagram illustrating a second embodiment of the method for producing a molded body of the present invention. [Diagram 3] 1 is a cross-sectional photograph near the surface of the FRTP molded product of Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, one embodiment of the fiber-reinforced thermoplastic plastic molded article and its manufacturing method of the present invention will be described.

[0013] The fiber-reinforced thermoplastic molded article of the present invention contains, as a raw material, an intermediate material that contains a fiber base material and a thermoplastic resin.

[0014] <Intermediate materials> The form of the intermediate material is not particularly limited, but it is preferably in the form of a prepreg in which a fiber base material is impregnated with a thermoplastic resin.

[0015] Examples of the fiber substrate include one or more of glass fiber, carbon fiber, aramid fiber, ultra-high strength polyethylene fiber, polybenzazole fiber, liquid crystal polyester fiber, polyketone fiber, metal fiber, ceramic fiber, etc. From the viewpoints of mechanical properties, thermal properties, and versatility, the fiber substrate is preferably glass fiber, carbon fiber, or aramid fiber.

[0016] The intermediate material may contain known materials such as silane coupling agents, lubricants, and binders as sizing agents for the fiber substrate (see, for example, JP 2015-101794 A). The type and amount of the sizing agent can be appropriately selected and used depending on the type of fiber substrate.

[0017] The fiber substrate may be any of short fibers, long fibers, and random fibers. For example, the average fiber length of the fiber substrate is not particularly limited and may be various lengths depending on the size, strength, etc. of the desired molded product, but is preferably in the range of 0.05 to 20 mm.

[0018] The form of the fiber substrate is not particularly limited, and examples thereof include woven fabrics, knitted fabrics, unidirectional materials, and multiaxial woven fabrics. These may be used as a single layer or in a laminated state, or may be used in combination with each other. The orientation of the fiber substrate may be selected arbitrarily according to the strength required for the molded product. In addition, the fiber substrate may be randomly dispersed in the resin, or may be configured as a randomly oriented material (such as a nonwoven fabric) that is randomly oriented.

[0019] The thermoplastic resin is not particularly limited, but examples thereof include polyolefin resins such as polyethylene and polypropylene; polyamide resins such as polyamide 6, polyamide 66, and polyamide 46; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate; polyacetal resins such as polyoxymethylene; polycarbonate resins; polyether ketone; polyether ether ketone; polyether sulfone; polyphenylene sulfide; thermoplastic polyetherimide; thermoplastic fluorine resins such as tetrafluoroethylene-ethylene copolymers, and modified thermoplastic resins obtained by modifying these. The thermoplastic resins can be used alone or in combination of two or more.

[0020] The intermediate material may contain additives as necessary, such as antioxidants, antioxidants, weathering agents, metal deactivators, light stabilizers, heat stabilizers, UV absorbers, antibacterial and antifungal agents, deodorizers, conductivity imparting agents, dispersants, softeners, plasticizers, crosslinking agents, co-crosslinking agents, vulcanizing agents, vulcanization assistants, foaming agents, foaming assistants, colorants, flame retardants, vibration dampers, nucleating agents, neutralizing agents, lubricants, antiblocking agents, dispersants, flow improvers, and mold release agents.

[0021] The intermediate material can be produced by a known method. Specifically, the intermediate material can be produced by, for example, a method of heating and pressurizing a laminate of a film-like thermoplastic resin and a sheet-like (woven fabric, knitted fabric, unidirectionally aligned sheet, multiaxially woven fabric, nonwoven fabric, etc.) fiber substrate, or a method of heating and pressurizing a sheet (woven fabric, knitted fabric, unidirectionally aligned sheet, multiaxially woven fabric, etc.) made of a fibrous thermoplastic resin (resin fiber) and a fiber substrate.

[0022] <Method for producing fiber-reinforced thermoplastic plastic molded body (first embodiment)> The manufacturing method of the fiber-reinforced thermoplastic molded body of the present invention (hereinafter, sometimes simply referred to as "molded body") is a manufacturing method of a fiber-reinforced thermoplastic molded body having an adhesive region for bonding to other materials, and includes the following arrangement step and molding step.

[0023] (Placement process) In the placing step, a fiber sheet is placed on a surface of an intermediate material containing a fiber base material and a thermoplastic resin.

[0024] The material of the fiber sheet is not particularly limited, and may be the same material (fiber) as the above-mentioned fiber substrate, or may be a different material (different fiber). The material of the fiber sheet can be appropriately selected from materials suitable for improving adhesive strength compared to the material constituting the fiber substrate. For example, cellulose fiber can be suitably used as the material of the fiber sheet. Since cellulose fiber has a higher polarity than the material used for the fiber substrate, the adhesive strength can be further improved when the material of the fiber sheet is cellulose fiber. In addition, since cellulose fiber is inexpensive compared to carbon fiber, the manufacturing cost can be reduced.

[0025] The form of the fiber sheet is not particularly limited, but examples include woven fabric, knitted fabric, unidirectional material, multiaxial woven fabric, nonwoven fabric, and paper, and these may be used as a single layer or in a laminate, or may be used in combination with each other.

[0026] The shape and size of the fiber sheet are not particularly limited, and can be appropriately designed depending on the range of the bonding area for bonding to other materials such as steel.

[0027] The thickness of the fiber sheet is not particularly limited, but is preferably 0.01 to 0.5 mm, and more preferably 0.03 to 0.3 mm. When the thickness of the fiber sheet is in this range, the fiber sheet is easily impregnated with the thermoplastic resin in the molding step described below, and the mechanical properties and adhesive strength of the molded product are good.

[0028] (molding process) In the molding step, the intermediate material and the fiber sheet are thermocompression molded to obtain a fiber-reinforced thermoplastic molded body in which at least a portion of the fiber sheet is impregnated with the thermoplastic resin.

[0029] When the intermediate material is a flat prepreg, a plurality of prepregs can be laminated for use.

[0030] The conditions of the thermo-compression molding can be appropriately adjusted in terms of the heating temperature, pressure, and time, taking into consideration the type of resin and the type and thickness of the fiber sheet, so that the fiber sheet is appropriately impregnated with the thermoplastic resin. Specifically, for example, the intermediate material and the fiber sheet are placed in a mold, the mold is heated to make the mold temperature equal to or higher than the melting point or glass transition temperature of the resin, and then the mold is clamped at 1 to 20 MPa, preferably 5 to 15 MPa, to perform pressure molding. If the pressure during molding is within this range, the thermoplastic resin is easily impregnated into the fiber sheet appropriately, and the mechanical properties and adhesive strength of the molded body become good. In addition, the molding time can be, for example, 1 to 30 minutes after the melting point or glass transition temperature of the resin is reached, and the mold can be opened thereafter. In addition, in the molding process, the mold can be appropriately cooled. As a result, a molded body that is integrally molded with the fiber sheet disposed on the surface can be obtained.

[0031] In the molding process, the fiber sheet forms an uneven surface on the surface of the molded body on which the fiber sheet is placed, and this uneven surface functions as an area for adhesion with other materials. In the manufacturing method of the molded body of the present invention, the adhesive strength with other materials is superior compared to the conventional methods for improving adhesive strength by shot blasting or primer treatment, and the uneven surface (adhesive area) can be formed by conventional thermocompression molding without increasing the number of work steps.

[0032] The uneven surface of the molded article has a surface roughness Ra (arithmetic mean roughness) of 2.1 or more, and a surface roughness RΔq (root mean square slope) of 0.15 or more. Furthermore, it is preferable that the uneven surface of the molded article has a surface roughness Ra of 3.0 or more, and an RΔq of 0.3 or more. When the surface roughness Ra and RΔq of the uneven surface are within this range, the molded article has excellent adhesive strength with other materials. In addition, the upper limit of the surface roughness Ra of the uneven surface of the molded article can be 10 or less, and the upper limit of the surface roughness RΔq can be 0.8 or less, for example.

[0033] FIG. 1 is a schematic diagram illustrating one embodiment of a fiber-reinforced thermoplastic plastic molded article of the present invention.

[0034] 1, the fiber sheet 2 on the surface of the molded body 1 is partially impregnated with the thermoplastic resin 3 in the thickness direction on the side opposite the surface side. In other words, the fiber sheet 2 located on the side opposite the surface of the molded body 1 has a resin-impregnated portion 2a impregnated with the thermoplastic resin 3.

[0035] In the molded body 1 of this type, it is preferable that the thermoplastic resin 3 is impregnated into the fiber sheet 2 by 20% or more relative to the thickness of the fiber sheet 2. When the amount of the thermoplastic resin 3 impregnated into the fiber sheet 2 is within this range, the molded body 1 has excellent mechanical strength, and since the uneven surface caused by the fiber sheet 2 is exposed on the surface of the molded body 1, the molded body 1 has excellent adhesive strength with other materials.

[0036] If the fiber sheet 2 is excessively impregnated with the thermoplastic resin 3, the uneven surface of the fiber sheet 2 is covered with the thermoplastic resin 3, making the surface of the molded article 1 smooth, making it difficult to ensure sufficient adhesive strength. On the other hand, if a part or the entire surface of the fiber sheet 2 is thinly covered with the thermoplastic resin 3 and the uneven surface of the fiber sheet 2 is exposed on the surface of the molded article 1, excellent adhesive strength can be achieved.

[0037] As described above, the fiber reinforced thermoplastic molded body 1 of the present invention contains an intermediate material containing a fiber base material 2 and a thermoplastic resin 3 as raw materials, and has an adhesion region for bonding to other materials. The fiber reinforced thermoplastic molded body 1 has a fiber sheet 2 on its surface. At least a portion of the fiber sheet 2 is impregnated with the thermoplastic resin 3, and an adhesion region consisting of an uneven surface caused by the fiber sheet 2 is formed on the surface, and this uneven surface has a surface roughness Ra of 2.1 or more and a surface roughness RΔq of 0.15 or more.

[0038] <Method for producing fiber-reinforced thermoplastic plastic molded body (second embodiment)> A second embodiment of the method for producing a fiber-reinforced thermoplastic plastic molded article of the present invention will be described. Explanations of parts common to the first embodiment will be omitted. Fig. 2 is a schematic diagram illustrating the second embodiment of the method for producing a molded article of the present invention.

[0039] In the second embodiment illustrated in Figure 2, after the arrangement step, the surface of the fiber sheet 2 is covered with a resin absorbent material 4, and in the molding step, the resin absorbent material 4 is removed from the surface of the fiber sheet 2 after thermocompression molding.

[0040] The material of the resin absorbing material 4 is not particularly limited, and a material that has heat resistance that can withstand the molding temperature and is easy to remove from the thermoplastic resin 3 and the mold after molding can be appropriately selected. Specifically, the material of the resin absorbing material 4 can be, for example, carbon fiber, glass fiber, inorganic fiber, etc. In addition, the resin absorbing material 4 can be, for example, a sheet-like form such as a woven fabric, knitted fabric, unidirectional material, multiaxial woven fabric, nonwoven fabric, etc. made of these materials. Furthermore, it is preferable that the resin absorbing material 4 is subjected to a release treatment by a known method such as silicone coating.

[0041] Figure 2 As shown in the example in FIG. 2, after the arrangement step, in the molding step, the surface of the fiber sheet 2 is covered with the resin-absorbing material 4 and is then thermo-compressed. This allows the thermoplastic resin 3 to be appropriately absorbed by the resin-absorbing material 4, forming a resin-impregnated portion 2a of a desired thickness, making it difficult for the fiber sheet 2 to be excessively impregnated with the thermoplastic resin 3, and preventing the uneven surface of the fiber sheet 2 from being covered with the thermoplastic resin 3. Then, after the thermo-compression molding, as shown in FIG. As shown in the example in FIG. 1, by removing the resin-absorbent material 4 from the surface of the fiber sheet 2, the uneven surface of the fiber sheet 2 can be exposed on the surface of the molded body 1.

[0042] According to the second embodiment, the uneven surface of the fiber sheet 2 is prevented from being covered by the thermoplastic resin 3, and the uneven surface of the fiber sheet 2 can be reliably exposed. In other words, the uneven surface of the fiber sheet 2 is prevented from being covered by the thermoplastic resin 3, and the surface of the molded body 1 is prevented from becoming smooth. Therefore, according to the manufacturing method of the second embodiment, it is possible to obtain a molded body 1 having excellent mechanical properties and adhesive strength with other materials.

[0043] <Complex> The method for producing a composite of the present invention includes a bonding step of bonding another material to the bonding region (convex and concave surface) of the fiber-reinforced thermoplastic plastic molded article obtained by the above-mentioned production method.

[0044] The other material to be bonded is not particularly limited and may be various metals, resins, etc. In particular, examples of the other material to be bonded include materials used for parts of automobiles, railroad cars, aircraft, etc., and building materials for housing.

[0045] The bonding method is not particularly limited, and any known adhesive can be used as appropriate. The adhesive is preferably applied to the bonding area of ​​the fiber-reinforced thermoplastic molded body.

[0046] The fiber-reinforced thermoplastic plastic molding of the present invention has an adhesive region formed on its surface, which is an uneven surface formed by a fiber sheet. For example, by appropriately applying an adhesive to this adhesive region, it is possible to adhere other materials with excellent adhesive strength.

[0047] The fiber-reinforced thermoplastic plastic molded article, the manufacturing method thereof, and the manufacturing method of the composite body of the present invention are not limited to the above embodiments. EXAMPLES

[0048] Hereinafter, the fiber-reinforced thermoplastic molded article of the present invention and its manufacturing method will be described with reference to examples. However, the fiber-reinforced thermoplastic molded article of the present invention and its manufacturing method are not limited to the following examples.

[0049] (1) Preparation of FRTP molded body <Comparative Example 1> A prepreg sheet (thickness: about 0.25 mm, carbon fiber volume content: about 65%, weight per unit area: 307 g / m) composed of a plain woven carbon fiber cloth of 3K yarn and polypropylene resin (PP). 2 ) were stacked together and a press molding machine equipped with a heat and cool mold was used to mold an FRTP molded body. The hot press conditions were a pressure of 50 kN, a time of 30 seconds, and a temperature of 180°C. The cold press conditions were a pressure of 500 kN, a cooling delay time of 120 seconds, and a cooling time of 300 seconds, producing an FRTP molded body. <Comparative Example 2> After molding in the same manner as in Comparative Example 1, the surface was subjected to a primer treatment. <Comparative Example 3> After molding in the same manner as in Comparative Example 1, the surface was subjected to shot blasting using alumina particles having a particle diameter of about 160 μm. <Example 1> An FRTP molded body was produced under the same molding conditions as in Comparative Example 1, except that a nonwoven fabric (approximately 230 μm thick) made of carbon fiber was placed on one side of the prepreg sheet and molded. <Example 2> A prepreg sheet (approx. 0.25 mm thick, carbon fiber volume content approx. 65%, basis weight 307 g / m) made of 3K plain woven carbon fiber cloth and polypropylene resin. 2 Ten sheets of cellulose fiber were stacked on top of each other, and a cellulose fiber nonwoven fabric (approximately 60 μm thick) was placed on one side, and an FRTP molded body was molded using a press molding machine equipped with a heat and cool mold. The molding temperature was started at 165°C, and a cooling press was performed with a pressure of 500 kN and a cooling time of 300 seconds, to produce an FRTP molded body.

[0050] 3 is a cross-sectional photograph of the vicinity of the surface of the FRTP molded article of Example 2. It was confirmed that the FRTP molded article of Example 2 had an exposed uneven surface due to the cellulose fiber nonwoven fabric. <Comparative Example 4> Ten prepreg sheets made of 3K plain weave carbon fiber cloth and polyamide resin (PA6) were stacked together and molded into an FRTP molded body using a press molding machine equipped with a heat and cool mold. The molding temperature was started at 245°C, and a cooling press was performed with a pressure of 500kN and a cooling time of 300 seconds to produce the FRTP molded body. <Example 3> An FRTP molded body was produced under the same molding conditions as in Comparative Example 1, except that a nonwoven fabric (thickness: about 230 μm) made of carbon fiber was placed on one side of the prepreg sheet and molded.

[0051] (2) Measurement of surface roughness The surface roughness was measured using a surface roughness and contour measuring instrument (SURFCOM2900SD3, Tokyo Seimitsu Co., Ltd.) under conditions of a cutoff wavelength of 2.5 mm and an evaluation length of 12.5 mm, and Ra (arithmetic mean roughness) and RΔq (root mean square slope) were calculated.

[0052] (3) Test pieces and measurements of tensile shear adhesive strength The FRTP molded body and aluminum alloy (A5052) were bonded with a two-liquid epoxy resin adhesive, with a pressure of 0.3 MPa applied to the bonding area for 12 hours in a natural environment. After bonding, the load was removed and the material was heat-treated at 80°C for 3 hours. The bonding surface of the A5052 was roughened by shot blasting using alumina particles with a particle diameter of approximately 160 μm before use. Tensile shear adhesive strength tests were carried out using a precision universal testing machine. Tests were carried out at a displacement rate of 0.5 mm / min in an environment of 23±2°C and 50±5% RT.

[0053] The results are shown in Tables 1 and 2.

[0054] [Table 1]

[0055] [Table 2]

[0056] As shown in Table 1, it was confirmed that the FRTP molded bodies of Examples 1 and 2 could be manufactured with fewer work steps and had superior adhesive strength compared to the FRTP molded bodies of Comparative Examples 1 to 3. Similarly, as shown in Table 2, it was confirmed that the FRTP molded body of Example 3 could be manufactured with fewer work steps and had superior adhesive strength compared to the FRTP molded body of Comparative Example 4. [Explanation of symbols]

[0057] 1 Molded body 2. Fiber sheet 3 Thermoplastic resin 4. Resin-absorbing materials

Claims

1. A method for producing a fiber-reinforced thermoplastic molding having an adhesion region for bonding to another material, comprising the steps of: A step of disposing a fiber sheet on a surface of an intermediate material including a fiber substrate and a thermoplastic resin; and A molding step of hot pressing the intermediate material and the fiber sheet to obtain a fiber-reinforced thermoplastic molded body in which at least a portion of the fiber sheet is impregnated with the thermoplastic resin. Including, In the molding step, the bonding area having an uneven surface due to the fiber sheet is formed on the surface of the fiber reinforced thermoplastic molded body on which the fiber sheet is arranged, A method for producing a fiber-reinforced thermoplastic plastic molding.

2. After the placing step, the surface of the fiber sheet is coated with a resin absorbing material, In the molding step, after the thermocompression molding, the resin-absorbent material is removed from the surface of the fiber sheet to expose the uneven surface formed by the fiber sheet. Including, A method for producing the fiber-reinforced thermoplastic plastic molding of claim 1.

3. The method includes a bonding step of bonding another material to the bonding region of the fiber-reinforced thermoplastic plastic molded body obtained by the manufacturing method of claim 1, A method for producing the composite.

4. A fiber-reinforced thermoplastic molded body including an intermediate material containing a fiber base material and a thermoplastic resin as a raw material and having an adhesive region for bonding to other materials, A fiber sheet is provided on the surface of the fiber reinforced thermoplastic molded body, At least a portion of the fiber sheet is impregnated with the thermoplastic resin, and the bonding region having an uneven surface formed by the fiber sheet is formed on the surface, The uneven surface of the bonding region has a surface roughness Ra of 2.1 or more and a surface roughness RΔq of 0.15 or more. Fiber-reinforced thermoplastic moldings.

5. The fibers of the fiber sheet are cellulose fibers. The fiber-reinforced thermoplastic plastic molding of claim 4.

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