A sandwich panel includes a middle material (2) and a surface material (3) that are laminated with a hollow columnar core (1). The middle material (2) is composed of a set of unidirectional fiber bodies (4, 5) each of whose fibers are aligned in one direction, and bonding layers formed by woven fibe
A sandwich panel includes a middle material (2) and a surface material (3) that are laminated with a hollow columnar core (1). The middle material (2) is composed of a set of unidirectional fiber bodies (4, 5) each of whose fibers are aligned in one direction, and bonding layers formed by woven fiber bodies (6, 7). The woven fiber body (7) includes a warp yarn and a woof yarn that is orthogonal to the warp yarn, and the yarns are woven, and the woven fiber body (7) is formed so that any one of the warp yarn and the woof yarn is substantially parallel to the edge of the sandwich panel, and the other of the warp yarn and the woof yarn is substantially orthogonal to the edge of the sandwich panel.
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1. A sandwich panel comprising: a hollow columnar core;a middle material layered on a first surface of the hollow columnar core and layered on a second surface of the hollow columnar core;a surface material layered on the middle material layered on the first surface of the hollow columnar core and l
1. A sandwich panel comprising: a hollow columnar core;a middle material layered on a first surface of the hollow columnar core and layered on a second surface of the hollow columnar core;a surface material layered on the middle material layered on the first surface of the hollow columnar core and layered on the middle material layered on the second surface of the hollow columnar core,wherein said middle material comprises: a first unidirectional fiber body, said first unidirectional fiber body having fibers that are aligned in a direction that is substantially parallel to an edge of the sandwich panel;a second unidirectional fiber body, said second unidirectional fiber body having fibers that are aligned in a direction that is substantially orthogonal to the edge of the sandwich panel;a first bonding layer having a resin content ratio of 50% or higher provided between the first unidirectional fiber body and the second unidirectional fiber body; anda second bonding layer having a resin content ratio of 50% or higher provided between said hollow columnar core and said second unidirectional fiber body,wherein the second bonding layer is composed of a woven fiber body in which fibers are used for a warp yarn and a woof yarn, and the yarns are woven, the warp yarn and the woof yarn being orthogonal to each other,wherein the woven fiber body is formed so that one of said warp yarn and said woof yarn is substantially parallel to said edge of the sandwich panel, and the other of the warp yarn and the woof yarn is substantially orthogonal to said edge of the sandwich panel, andwherein the resin content ratio is a ratio between a weight of resin in a bonding layer and a weight of the bonding layer containing the resin,wherein the sandwich panel has a weight per unit area of 1.59 kg/m2 or less, a maximum bending load of 510 N or greater, a peel strength of 60·N in/3 in or greater, and an in-plane shear strength of 20 kN or greater. 2. A sandwich panel comprising: a hollow columnar core;a middle material layered on a first surface of the hollow columnar core and layered on a second surface of the hollow columnar core;surface material layered on the middle material layered on the first surface of the hollow columnar core and layered on the middle material layered on the second surface of the hollow columnar core,wherein said middle material comprises: a first unidirectional fiber body, said first unidirectional fiber body having fibers that are aligned in a direction that is substantially parallel to an edge of the sandwich panel, the first unidirectional fiber body having a resin content ratio of 30% or lower;a second unidirectional fiber body, said second unidirectional fiber body having fibers that are aligned in a direction that is substantially orthogonal to the edge of the sandwich panel, the second unidirectional fiber body having a resin content ratio of 30% or lower;a first bonding layer having a resin content ratio of 50% or higher provided between the first unidirectional fiber body and the second unidirectional fiber body; anda second bonding layer having a resin content ratio of 70% or higher provided between the hollow columnar core and the second unidirectional fiber body,wherein the second bonding layer is composed of a woven fiber body in which fibers are used for a warp yarn and a woof yarn, and the yarns are woven, the warp yarn and the woof yarn being orthogonal to each other,wherein the woven fiber body is formed so that one of said warp yarn and said woof yarn is substantially parallel to said edge of the sandwich panel, and the other of the warp yarn and the woof yarn is substantially orthogonal to said edge of the sandwich panel, andwherein resin content is a ratio between a weight of resin in a bonding layer and a weight of the bonding layer containing the resin,wherein the sandwich panel has a weight per unit area of 1.59 kg/m2 or less, a maximum bending load of 510 N or greater, a peel strength of 60·N in/3 in or greater, and an in-plane shear strength of 20 kN or greater. 3. The sandwich panel according to any one of claims 1 and 2, wherein: said first bonding layer comprises a woven fiber body in which fibers are used for a warp yarn and a woof yarn, and the yarns are woven; andthe woven fiber body of said first bonding layer is formed so that any one of the warp yarn and the woof yarn is substantially parallel to said edge of the sandwich panel, and the other of the warp yarn and the woof yarn is substantially orthogonal to said edge of the sandwich panel, or said warp yarn and woof yarn are each formed approximately 45° in relation to said edge of said sandwich panel. 4. The sandwich panel according to claim 3, wherein carbon fibers are used for the fibers of said first unidirectional fiber body and said second unidirectional fiber body, and glass fibers are used for the fibers of said woven fiber bodies of said first bonding layer and said second bonding layer. 5. The sandwich panel according to claim 3, wherein carbon fibers are used for the fibers of said first unidirectional fiber body and said second unidirectional fiber body, and glass fibers and carbon fibers are used for the fibers of said woven fiber bodies of said first bonding layer and said second bonding layer. 6. The sandwich panel according to any one of claims 1 and 2, wherein a polyvinylidene fluoride film or a non-woven cloth that includes glass fibers is used for said surface material.
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