Jamco Corporation

Arisawa Mfg. Co., Ltd.

Hiroshi Horigome

Hiroshi Tanaka

Masaaki Hirai

Yasunobu Tanaka

A sandwich panel includes a middle material () and a surface material () that are laminated with a hollow columnar core (). The middle material () is composed of a set of unidirectional fiber bodies () each of whose fibers are aligned in one direction, and bonding layers formed by woven fiber bodies (). The woven fiber body () 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 () 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.

Sandwich panel

There is provided a lightweight sandwich panel of exceptional utility, which satisfies the flexural strength and in-plane shear strength requirements for an inner wall material used in aircraft. The sandwich panel comprises a laminating material in which a plurality of fiber bodies is laminated, and a surface material, the laminating material and the surface material being laminated in the stated order from the inside to the outside on the upper and lower surfaces of a hollow columnar core. The laminating material comprises at least four unidirectional fiber bodies each of which has fibers aligned in a uniform direction and is laminated so that each of the fiber directions thereof is at approximately 0&#xb0;, +45&#xb0;, &#x2212;45&#xb0;, and 90&#xb0;, respectively, in relation to one edge of the sandwich panel. The unidirectional fiber bodies are stitched together using a stitching yarn.

A sandwich panel that has excellent practicality as an inner wall material used in aircraft, for example, whereby the abovementioned requirements of flexural strength, peel strength, and in-plane shear strength can be satisfied while having reduced weight. A sandwich panel in which a middle materialand a surface materialthat are each formed by laminating a plurality of fiber bodies are laminated from inside to outside on the upper and lower surfaces of a hollow columnar core, wherein the middle materialis composed of a set of unidirectional fiber bodieswhose fibers are aligned in one direction, fibers in a first unidirectional fiber bodyare in a direction that is substantially parallel to an edge of the sandwich panel, fibers in a second unidirectional fiber bodyare in a direction that is substantially orthogonal to an edge of the sandwich panel, and bonding layershaving a resin content ratio of 50% or higher are provided between the unidirectional fiber bodiesand between the hollow columnar coreand an inside unidirectional fiber body

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Mitaka, Japan

Hiroshi Horigome