JP2009220478A - Fiber-reinforced sandwich structure composite and composite molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber-reinforced sandwich structure composite which can be satisfactorily used only when a core base material itself satisfies necessary requiring characteristics (for example, strength, flame resistance, heat resistance and durability) and to provide a composite molding using the fiber-reinforced sandwich structure composite. <P>SOLUTION: The sandwich structure composite has the core base material as an intermediate layer and fiber-reinforced materials 5 comprising continuous fiber and a matrix resin on both surfaces of the core base material. In at least a part of the core base material, two or more through-holes 3 are formed in parallel with a thickness direction of the core base material and the fiber-reinforced materials provided on both surfaces of the core base material are joined to each other by the matrix resin in the two or more through-holes 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fiber-reinforced sandwich composite suitable for applications requiring thin wall, light weight, and high rigidity, and a composite molded body using the same. More specifically, the present invention relates to a fiber reinforced sandwich composite excellent in adhesion between a core material and a fiber reinforcing material disposed on both sides of the core material, and a composite molded body using the same.

  Conventionally, carbon fiber has been used as a composite molded body for many industrial, aircraft, and sports because of its high rigidity, high strength, high elasticity, low specific gravity, and light weight. Industrial applications have been applied to personal computers, digital cameras, and the like, and sandwich structure composites combining a resin sheet containing reinforcing fibers and a lightweight intermediate layer have been proposed for further weight reduction (for example, Patent Document 1). ).

However, a lighter and cheaper composite molded body has been demanded for development in the above applications. On the other hand, the use of reinforcing fibers is limited in terms of weight reduction and cost reduction because they use properties such as strength and rigidity. Therefore, in order to reduce weight and reduce costs, it is necessary to consider an intermediate layer core material and make it cheaper and lighter.However, the core material has limitations on adhesion to fiber reinforcement and heat resistance in curing molding. It was.
JP 2007-38519 A

  The fiber reinforced sandwich composite obtained by the prior art is based on the adhesiveness between the core material of the intermediate layer and the fiber reinforced material of the surface layer. There were restrictions, and there were restrictions on weight, thickness and construction method. Furthermore, it is necessary to consider the required characteristics and cost of the structure, and it has been difficult to reduce the thickness and weight further.

  In view of the problems of the prior art, the present invention can be used without problems as long as the core base material itself satisfies the required properties (for example, strength, flame retardancy, heat resistance, durability, etc.). An object is to provide a fiber-reinforced sandwich composite and a composite molded body using the same.

The present invention for solving the above problems employs the following configuration. That is,
(1) A sandwich structure composite having a core base material in an intermediate layer, and a fiber reinforcing material having continuous fibers and a matrix resin on both surfaces of the core base material, A plurality of through-holes penetrating in the thickness direction of the core base material are provided in at least a part of the base material, and the fiber reinforcing material provided on both surfaces of the core base material includes the plurality of through-holes. 1. A fiber-reinforced sandwich structure composite, which is bonded with the matrix resin.

  (2) The fiber-reinforced sandwich structure composite according to (1), wherein the matrix resin is present in 30% or more through holes with respect to the number of all through holes.

  (3) The fiber reinforced sandwich structure according to (1) or (2), wherein the plurality of through holes in which the matrix resin is present have an inclination of 10 ° or less with respect to the thickness direction of the core substrate. Complex.

  (4) The fiber reinforced sandwich structure composite according to any one of (1) to (3), wherein the continuous fibers are carbon fibers.

  (5) The fiber reinforced sandwich structure composite according to any one of (1) to (4), wherein the matrix resin contained in the fiber reinforcing material is a resin sheet containing an epoxy resin as a main component.

  (6) The fiber-reinforced sandwich structure composite according to any one of (1) to (5), wherein the core substrate is in the form of a sheet or a film.

  (7) The fiber reinforced sandwich structure composite according to any one of (1) to (6), wherein the thickness is 0.4 to 10 mm.

  (8) The fiber reinforced sandwich structure composite according to any one of (1) to (7), wherein the fiber reinforcing material has a thickness of 0.1 to 5 mm.

  (9) The fiber-reinforced sandwich structure composite according to any one of (1) to (8), wherein the core substrate has a thickness of 0.2 to 5 mm.

(10) The fiber-reinforced sandwich structure composite according to any one of (1) to (9), wherein the apparent density of the core substrate is 0.1 to 10.0 g / cm ³ .

  (11) The fiber reinforced sandwich structure composite according to any one of (1) to (10), wherein an area occupancy of the plurality of through holes is 5 to 70%.

  (12) A composite molded body obtained by outsert molding a resin into the fiber-reinforced sandwich structure composite according to any one of (1) to (11).

  (13) The composite molded body according to (12), wherein the resin is a thermoplastic resin.

  In the present invention, a plurality of through holes penetrating in the thickness direction of the core base material are provided in at least a part of the core base material, and the fiber reinforcing material provided on both surfaces of the core base material Since it is joined by the matrix resin in a plurality of through holes, it is thin, lightweight, and highly rigid, without being restricted by the choice of core base material and the necessity of providing an adhesive layer. A fiber-reinforced sandwich structure composite having good adhesion between the core substrate of the layer and the fiber reinforcing material of the surface layer can be obtained.

  In particular, the adhesion between the core substrate of the intermediate layer and the fiber reinforcing material of the surface layer is such that the matrix resin is present in the number of through holes of 30% or more of the total number of through holes, or the matrix resin is present. A favorable result is shown when the several through-hole which has the inclination within 10 degrees with respect to the thickness direction of a core base material.

  Composite composites obtained by outsert molding of resin into such fiber reinforced sandwich structure composites can be used for electrical appliances such as personal computers, digital cameras, mobile phones and other portable information terminals by taking advantage of their thin wall, light weight and high rigidity. -It is preferably applied to the housing of electronic equipment.

  The fiber reinforced sandwich structure composite of the present invention has a sandwich structure in which an intermediate layer has a core base material, and a fiber reinforcing material having continuous fibers and a matrix resin is provided on both sides of the core base material. A fiber reinforced structure provided with a plurality of through holes penetrating in a thickness direction of the core base material in at least a part of the core base material, and provided on both surfaces of the core base material. A material is joined by the matrix resin in the plurality of through holes. The fiber reinforcement is necessary to ensure rigidity, and the core base material is necessary to achieve thinness, weight reduction and thickness adjustment as described later by adopting such a sandwich structure. It is.

  Here, the through-hole penetrating in the thickness direction of the core base material means a hole penetrating from the upper surface to the lower surface of the core base material, and the through-hole 2 in FIG. The form of the through hole 2 is not limited as long as it penetrates from the upper surface to the lower surface of the core substrate 1, but as shown in FIG. 2, the angle α with respect to the thickness direction of the core substrate 1 is within 10 °. In addition to the better adhesion between the core substrate and the fiber reinforcement, the strength of the core substrate 1 is preferably improved. More preferably, the angle α with respect to the thickness direction of the core substrate 1 is 0 ° (that is, the through hole 2 and the thickness direction of the core substrate 1 are parallel).

  As shown in FIG. 4, the present invention is characterized in that fiber reinforcing materials 5 provided on both surfaces of the core base material 1 are joined by the matrix resin in the plurality of through holes (3 is applicable). However, as shown in FIG. 3, it is not necessary that the matrix resin is present in all the through holes, and the matrix resin is formed in all through holes in order to improve the adhesion between the core substrate and the fiber reinforcing material. It is preferable that the number of through holes is 30% or more with respect to the number of holes.

  As the fiber reinforcing material, a sheet containing reinforcing fibers is preferably used. Examples of reinforcing fibers include metal fibers such as aluminum fibers, brass fibers, and stainless fibers, carbon fibers such as polyacrylonitrile, rayon, lignin, and pitch, graphite fibers, glass fibers, silicon carbide fibers, and silicon nitride. Inorganic fibers such as fibers, organic fibers such as aramid fibers, polyparaphenylene benzobisoxazole (PBO) fibers, polyphenylene sulfide fibers, polyester fibers, acrylic fibers, nylon fibers, and polyethylene fibers can be used. These reinforcing fibers may be used alone or in combination of two or more. Among these, carbon fibers are preferable from the viewpoint of the balance of specific strength, specific rigidity, and lightness, and at least polyacrylonitrile-based carbon fibers are preferably included from the viewpoint of excellent specific strength and specific elastic modulus.

  Moreover, the sheet | seat containing the reinforced fiber used for a fiber reinforcement may be comprised from the several layer containing a reinforced fiber. Further, if the reinforcing fiber is a continuous reinforcing fiber, it is preferable because higher strength and rigidity can be obtained.

  A sheet containing continuous reinforcing fibers is a sheet in which continuous reinforcing fibers having a length of 10 mm or more are arranged in a sheet (or in a layer containing reinforcing fibers constituting the sheet), and is not necessarily a sheet ( Or it is not necessary to be continuous over the entire layer including the reinforcing fibers constituting the sheet, and there is no particular problem even if it is divided in the middle. Specific examples of the continuous reinforcing fiber include filaments, woven fabrics (cross), unidirectional alignment (UD), and braids (blades). From the viewpoint of process, cloth and UD are preferably used. Is done. Moreover, these forms may be used independently or may use 2 or more types together. Of these, multi-filaments arranged in one direction are preferable because strength and rigidity can be obtained more efficiently.

  A thermoplastic resin, a thermosetting resin, etc. can be used for the matrix layer of the sheet | seat contained in a fiber reinforcement.

  Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyvinylidene chloride resin, ABS resin, polystyrene resin, AS resin, methacrylic resin, polyvinyl alcohol resin, EVA resin, cellulose resin, polyamide resin, Polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, thermoplastic polyester resin, polytetrafluoroethylene resin, fluorine resin, polyphenylene sulfide resin, polysulfone resin, amorphous polyarylate resin, polyetherimide resin, polyethersulfone resin, poly Examples include ether ketone resins, liquid crystal polyester resins, polyamide imide resins, polyimide resins, polyanil ether nitrile resins, and polybenzoimidazole resins. These thermoplastic resins may be used alone, or may be a mixture or a copolymer. In the case of a mixture, a compatibilizing agent may be used in combination. Furthermore, for the purpose of adding a specific function, for example, a brominated flame retardant, a silicon flame retardant, red phosphorus, a phosphate ester, or the like may be blended as a flame retardant.

  When a thermoplastic resin is used as the matrix layer of the sheet included in the fiber reinforcement, as a means for causing the matrix resin to exist in the through-hole penetrating in the thickness direction of the core base material, between the upper and lower metal hot plates In general, a method of sandwiching a fiber reinforced sheet and an intermediate layer core material having a through hole and a fiber reinforced material sheet, pressurizing and heating, causing the matrix resin to flow through the through hole, and cooling, A flow method using an intermediate layer core material containing a matrix resin may be used and is not limited.

  Examples of thermosetting resins include unsaturated polyesters, vinyl esters, epoxies, phenols (resol type), urea melamines, polyimides, copolymers thereof, modified products, and blends of at least two of these. Resin. Furthermore, for the purpose of adding a specific function, for example, a brominated flame retardant, a silicon flame retardant, red phosphorus, a phosphate ester, or the like may be blended as a flame retardant.

  When a thermosetting resin is used as the matrix layer of the sheet included in the fiber reinforcement, as a means for causing the matrix resin to exist in the through-hole penetrating in the thickness direction of the core base material, there is a space between the upper and lower metal hot plates The intermediate layer core material having a fiber reinforced sheet and a through hole and a fiber reinforced material sheet were sandwiched, and pressurized and heated to cause the matrix resin to flow through the through hole and simultaneously cure the thermosetting resin. Although a method of cooling later is generally used, a flow method using an intermediate layer core material containing a matrix resin may be used and is not limited.

  Among these, since the sandwich structure composite is excellent in rigidity and strength, it is preferable to use a thermosetting resin for the matrix layer. In particular, a thermosetting resin mainly composed of an epoxy resin is used as the dynamics of the molded product. More preferable from the viewpoint of characteristics. Further, in order to improve impact resistance, a resin obtained by adding a thermoplastic resin and / or other elastomer or rubber component to a thermosetting resin may be used.

  When a sheet containing reinforcing fibers is used as the fiber reinforcing material, the proportion of reinforcing fibers is preferably 20 to 90% by volume and more preferably 30 to 80% by volume from the viewpoints of moldability and mechanical properties. The volume% is measured by the method described in JIS K 7075 (1991) when the matrix is a resin.

  As the core substrate, foamed materials, resin sheet-like materials, film-like materials and the like can be preferably used. Of these, it is preferable to use a foam material because a lightweight sandwich structure composite can be obtained.Furthermore, a foam structure as a core layer is used as a central layer, and a fiber structure is provided on both sides of the sandwich structure. It is more preferable because a sandwich structure composite having a thin wall, light weight and high rigidity can be obtained. Examples of means for providing a through hole in the thickness direction of the core base material include mechanical processing such as mechanical punching and NC processing. Moreover, it is preferable that the some through-hole provided in the thickness direction of a core base material is 5-70% as a ratio (area occupation rate) which occupies in the area of all the core base materials. By setting it to 5% or more, it becomes easy to maintain good adhesion between the core base material and the fiber reinforcing material, and by setting it to 70% or less, the required characteristics can be obtained because the strength and durability of the core base material itself. It is because it becomes easy to be satisfied.

The thickness of the sandwich structure composite is preferably 0.4 to 10.0 mm. If it is too thin, it will be difficult to limit the material and make the thickness variation uniform, and if it is too thick, it is not preferable because it will not meet the demands for lightweight and thin portable electronic devices such as notebook personal computers in recent years. From the same viewpoint, the thickness of the fiber reinforcement is preferably 0.1 to 5 mm, the thickness of the core substrate is preferably 0.2 to 5 mm, and the apparent density of the core substrate is It is preferable that it is 0.1-10.0 g / cm < ³ >.

  The fiber reinforced sandwich structure composite is manufactured using thermosetting resins such as press molding, hand lay-up molding, spray-up molding, vacuum back molding, pressure molding, autoclave molding, and transfer molding. And methods using thermoplastic resins such as press molding and stamping molding. In particular, vacuum back molding, press molding, transfer molding, and the like are preferably used from the viewpoint of processability and mechanical properties.

  The present invention can be used as it is with the sandwich structure composite, but in many cases, the composite structure can be obtained by outsert molding with other resin around the sandwich structure. The resin used for outsert molding is not particularly limited as long as it has fluidity and functionality suitable for molding, but most are thermoplastic resins.

  The thermoplastic resin used for the resin for outsert molding is not particularly limited. For example, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyvinylidene chloride resin, ABS resin, polystyrene resin, AS resin, methacrylic resin, Polyvinyl alcohol resin, EVA resin, cellulose resin, polyamide resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, thermoplastic polyester resin, polytetrafluoroethylene resin, fluorine resin, polyphenylene sulfide resin, polysulfone resin, amorphous Polyarylate resin, polyetherimide resin, polyethersulfone resin, polyetherketone resin, liquid crystal polyester resin, polyamideimide resin, polyimide resin, polyaniletherni Lil resins, and the like polybenzimidazole Imi Dahl resin. Among these, when considering the various mechanical properties of injection molded products, polyethylene resin, polypropylene resin, ABS resin, polystyrene resin, AS resin, polyamide resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, thermoplastic polyester resin, polyphenylene A sulfide resin or the like is preferable, and an ABS resin, a polyamide resin, or a polycarbonate resin is more preferable. These thermoplastic resins may be used alone, or may be a mixture or a copolymer. In the case of a mixture, a compatibilizing agent may be used in combination. Furthermore, for the purpose of adding a specific function, for example, a brominated flame retardant, a silicon flame retardant, red phosphorus, a phosphate ester, or the like may be blended as a flame retardant.

  In order to increase the strength and rigidity of the composite molded body, it is also preferable to use a thermoplastic resin containing reinforcing fibers as the outsert molding resin. Examples of reinforcing fibers include metal fibers such as aluminum fibers, brass fibers, and stainless fibers, carbon fibers such as polyacrylonitrile, rayon, lignin, and pitch, graphite fibers, glass fibers, silicon carbide fibers, and silicon nitride. Inorganic fibers such as fibers, organic fibers such as aramid fibers, polyparaphenylene benzobisoxazole (PBO) fibers, polyphenylene sulfide fibers, polyester fibers, acrylic fibers, nylon fibers, and polyethylene fibers can be used. These reinforcing fibers may be used alone or in combination of two or more. Among these, carbon fibers are preferable from the viewpoint of the balance of specific strength, specific rigidity, and lightness, and at least polyacrylonitrile-based carbon fibers are preferably included from the viewpoint of excellent specific strength and specific elastic modulus. Furthermore, the outsert resin may contain other fillers and additives in a range that does not impair the object of the present invention, depending on required properties. For example, inorganic fillers, non-phosphorous flame retardants, conductivity imparting agents, crystal nucleating agents, ultraviolet absorbers, antioxidants, vibration damping agents, antibacterial agents, insect repellents, deodorants, anti-coloring agents, heat stabilizers , Mold release agents, antistatic agents, plasticizers, lubricants, colorants, pigments, dyes, foaming agents, antifoaming agents, coupling agents and the like.

  As a method for outserting the resin to the fiber reinforced sandwich structure composite, a general injection molding method is used. The injection molding machine for obtaining the molded product of the present invention is not particularly limited, and may be either an in-line type or a pre-pull type, and includes a special mixing piece regardless of whether it is a screw type or a general-purpose screw. There may be. Furthermore, an injection compression mechanism and various auxiliary mechanisms may be provided.

  Applications of the composite molded body of the present invention include, for example, personal computers, displays, OA equipment, mobile phones, portable information terminals, facsimile machines, compact discs, portable MDs, portable radio cassettes, PDAs (mobile information terminals such as electronic notebooks). , Video cameras, digital still cameras, optical equipment, audio equipment, air conditioners, lighting equipment, entertainment equipment, toy products, other electrical appliances such as household appliances, internal parts such as trays and chassis, cases, and mechanical parts And electric parts for automobiles and aircraft, internal parts, and the like.

  In particular, the sandwich structure composite of the present invention and the composite molded body using the same are suitable for electrical and electronic equipment casings and external members by taking advantage of its excellent thinness, light weight and high rigidity. Furthermore, it is suitable as a casing for a notebook personal computer or a portable information terminal that requires a thin and wide projection area.

  Hereinafter, the present invention will be described in detail by way of examples. In addition, the following method was used for evaluation of the fiber reinforced sandwich structure obtained in the examples.

[Measurement of thickness]
The thickness of an arbitrary portion of the fiber reinforced sandwich structure was measured at three points using a micrometer (Digimicrometer 389 (300 mm depth) manufactured by Mitutoyo Corporation), and the average value was obtained.

[Percentage of through-holes with matrix resin to all through-holes]
Cut and polish all locations of the core base material of the intermediate layer in the thickness direction, polish, and visually measure the number of through holes filled with matrix resin, and divide by the total number of through holes. And asked.

[Angle of the through hole where the matrix resin exists with respect to the thickness direction of the core substrate]
The core base material of the intermediate layer was cut in the thickness direction at any three locations where through-holes existed, the angle (corresponding to α in FIG. 2) with respect to the thickness direction of the core base material was measured, and the average value was obtained. .

[Adhesiveness]
Using a device as shown in FIG. 5, two stainless steel cylinders with a length of 10 mm and a length of 120 mm are fixed to a frame with a width of 150 mm, and a sample of a fiber-reinforced sandwich structure composite having a width of 100 mm and a length of 250 mm is placed between them. Place a pressure jig with a 10 mmφ and 120 mm long stainless steel cylinder fixed from the top of the gantry at a pressure of 0.98 MPa at 1 mm / min, Adhesiveness was evaluated by the presence or absence of peeling. Evaluation was performed by visual inspection, and the case where neither cracks nor peeling was confirmed was evaluated as “◯”, and the case where cracks or separation was confirmed was evaluated as “X”.

Example 1
As a core substrate, holes with a diameter of 10 mm were formed at intervals of 20 mm (center-to-center distance) in a Lumirror film (polyester resin film manufactured by Toray Industries, Inc., thickness 0.7 mm). The area occupation ratio of the holes was 39.3%. The core material is arranged as an intermediate layer, and carbon fiber unidirectional prepreg (UD PP) P3052S (Toray Industries, Inc. carbon fiber T700S (strength 4900 MPa, elastic modulus 230 GPa, carbon fiber content 67) is provided on the upper and lower surfaces as a fiber reinforcement. Thickness by weight (base resin: epoxy resin) laminated in two layers so that the fiber array direction is almost perpendicular to each other is press-molded (die temperature 130 ° C., pressure 30 kg / cm ² , curing time 120 minutes), thickness A 1.3 mm fiber reinforced sandwich structure composite was manufactured, the ratio of the through hole where the matrix resin is present to the total through hole is 95%, and the angle of the through hole where the matrix resin is present with respect to the thickness direction of the core substrate is As a result, a fiber-reinforced sandwich structure having light weight, high rigidity, and no delamination was obtained.

  After processing this fiber reinforced sandwich structure composite to a size of 300 mm × 230 mm and setting it inside the mold 11, long fiber pellets TLP1146 (carbon fiber content 20%, Toray Industries, Inc., base resin as an outsert resin) Polyamide 6) was continuously injection molded to produce a composite molded body.

(Example 2)
As a core substrate, holes with a diameter of 5 mm were opened at intervals of 20 mm (center-to-center distance) in a Lumirror film (a polyester resin film manufactured by Toray Industries, Inc., thickness 0.7 mm). The area occupation ratio of the holes was 9.8%. A fiber reinforced sandwich structure composite and a composite molded body by injection molding were produced in the same manner as in Example 1. The ratio of the through holes where the matrix resin is present to the total through holes of the fiber reinforced sandwich structure composite was 90%, and the angle of the through holes where the matrix resin was present with respect to the thickness direction of the core substrate was 0 °. .

(Example 3)
As a core substrate, holes with a diameter of 5 mm were formed at intervals of 20 mm (center-to-center distance) in a foam material sheet (a polypropylene resin sheet manufactured by Furukawa Electric Co., Ltd., thickness 1.0 mm). The area occupation ratio of the holes was 9.8%. A fiber reinforced sandwich structure composite and a composite molded body by injection molding were produced in the same manner as in Example 1. The ratio of the through holes where the matrix resin is present to the total through holes of the fiber reinforced sandwich structure composite was 80%, and the angle of the through holes where the matrix resin was present with respect to the thickness direction of the core substrate was 5 °. .

(Comparative Example 1)
A holeless product of Lumirror film (a polyester resin film manufactured by Toray Industries, Inc., thickness 0.7 mm) was prepared as a core substrate. A fiber reinforced sandwich structure composite and a composite molded body by injection molding were produced in the same manner as in Example 1.

(Comparative Example 2)
As the core substrate, a non-holed product of a foam sheet (Furukawa Electric Co., Ltd. polypropylene resin sheet, thickness 1.0 mm) was prepared. A fiber reinforced sandwich structure composite and a composite molded body by injection molding were produced in the same manner as in Example 1.

It is the schematic which shows an example of the preferable core base material used for this invention. It is the schematic which shows an example of the preferable core base material used for this invention. It is the schematic which shows an example in the state where matrix resin exists in a part of through-hole of the core base material used for this invention. It is the schematic which shows an example of the fiber reinforced sandwich structure composite_body | complex which concerns on this invention. It is the schematic of the apparatus used for the adhesive evaluation of the fiber reinforced sandwich structure composite based on this invention.

Explanation of symbols

1: Core base material 2: Through hole 3: Through hole in which matrix resin is present (configuration in which fiber reinforcing materials are joined together)
4: Through hole without matrix resin 5: Fiber reinforcing material 6: Sample of fiber reinforced sandwich structure composite 7: Stainless steel cylinder 8: Pressure jig 9: Mounting base

Claims (13)

A sandwich structure composite having a core base material in an intermediate layer and provided with a fiber reinforcing material having continuous fibers and a matrix resin on both sides of the core base material. A plurality of through-holes penetrating in the thickness direction of the core base material are provided at least in part, and the fiber reinforcing material provided on both surfaces of the core base material is the matrix in the plurality of through-holes. A fiber-reinforced sandwich structure composite, which is bonded with a resin. The fiber reinforced sandwich structure composite according to claim 1, wherein the matrix resin is present in the number of through holes of 30% or more with respect to the number of all through holes. The fiber reinforced sandwich structure composite according to claim 1 or 2, wherein the plurality of through holes in which the matrix resin is present have an inclination of 10 ° or less with respect to a thickness direction of the core substrate. The fiber-reinforced sandwich structure composite according to any one of claims 1 to 3, wherein the continuous fibers are carbon fibers. The fiber reinforced sandwich structure composite according to any one of claims 1 to 4, wherein the matrix resin contained in the fiber reinforcing material is a resin sheet mainly composed of an epoxy resin. The fiber-reinforced sandwich structure composite according to any one of claims 1 to 5, wherein the core substrate is in the form of a sheet or a film. The fiber-reinforced sandwich structure composite according to any one of claims 1 to 6, wherein the thickness is 0.4 to 10 mm. The fiber reinforced sandwich structure composite according to any one of claims 1 to 7, wherein the fiber reinforcing material has a thickness of 0.1 to 5 mm. The fiber-reinforced sandwich structure composite according to any one of claims 1 to 8, wherein the core substrate has a thickness of 0.2 to 5 mm. The fiber-reinforced sandwich structure composite according to any one of claims 1 to 9, wherein the apparent density of the core substrate is 0.1 to 10.0 g / cm ³ . The fiber reinforced sandwich structure composite according to any one of claims 1 to 10, wherein an area occupation ratio of the plurality of through holes is 5 to 70%. A composite molded body obtained by outsert molding a resin to the fiber-reinforced sandwich structure composite according to any one of claims 1 to 11. The composite molded body according to claim 12, wherein the resin is a thermoplastic resin.

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