Patent ID: 11964439
Assignee: NITTO DENKO CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A method for producing a reinforcement structure comprising the steps of:
preparing a reinforcement sheet including a core material layer being in an uncured state and containing an unmodified epoxy resin and a rubber-modified epoxy resin as a resin and further containing a latent curing agent that cures the resin at 80° C. or more and 200° C. or less, a front layer disposed at one side in a thickness direction of the core material layer in an uncured state and containing a plurality of fibers, and an adhesive layer disposed at one side in the thickness direction of the core material layer in an uncured state;
preparing an adherend including a first surface extending in a first direction, a second surface extending in a second direction crossing the first direction, and a first corner portion connecting the first surface to the second surface; and
attaching the reinforcement sheet to the adherend so as to provide the adhesive layer along the first surface, the second surface, and the first corner portion, position the core material layer in an uncured state between the adhesive layer and the front layer, and position the front layer at spaced intervals to the first surface, the second surface, and the first corner portion;
wherein the step of attaching the reinforcement sheet to the adherend, further comprises:
positioning a first front layer portion in the front layer at spaced intervals to the first surface in the second direction and extending in the first direction;
positioning a second front layer portion in the front layer at spaced intervals to the second surface in the first direction and extending in the second direction;
positioning a third front layer portion in the front layer at spaced intervals to the first corner portion in a third direction crossing both directions of the first direction and the second direction; and
positioning the third front layer portion so that a gap between the first surface and the third front layer portion in the second direction gradually increases as it gets closer to the first corner portion in the first direction with respect to a gap between the first surface and the first front layer portion in the second direction; and
wherein a gap between the second surface and the third front layer portion in the first direction gradually increases as it gets closer to the first corner portion in the second direction with respect to a gap between the second surface and the second front layer portion in the first direction;

wherein the core material layer in an uncured state includes:
a first portion along the first surface;
a second portion along the second surface; and
a third portion along the first corner portion; and
wherein a thickness of the third portion along the second direction is thicker than a thickness of the first portion along the second direction and a thickness of the third portion along the first direction is thicker than a thickness of the second portion along the first direction.