Manufacturing method of resin composite plate

A method of manufacturing a resin composite plate, the method comprising:

• laying a plurality of fiber-reinforced thermoplastic resin sheet groups having different thicknesses side-by-side on a plane, each of the plurality of fiber-reinforced thermoplastic resin sheet groups containing fibers arranged in one direction, wherein:
• a joint surface between adjacent fiber-reinforced thermoplastic resin sheet groups among the plurality of fiber-reinforced thermoplastic resin sheets laid on the plane is in a form of (i) a curved surface, (ii) plural planes, or (iii) a combination of a curved surface and a plane;
• and
• manufacturing the resin composite plate by heating, under pressure, the plurality of fiber-reinforced thermoplastic resin sheet groups that are laid side-by-side on the plane, to integrate the plurality of fiber-reinforced thermoplastic resin sheet groups into said resin composite plate, wherein
• at least one resin sheet group among the plurality of resin sheet groups laid on the plane requires strength and differs from another resin sheet group not requiring strength among the plurality of resin sheet groups laid on the plane in a number of fiber-reinforced thermoplastic resin sheets that are stacked, so as to increase the strength of said at least one resin sheet group and to weaken the strength of said another resin sheet group.

A method of manufacturing a three-dimensional formed article, the method comprising:

• manufacturing a plurality of resin composite plates each having a predetermined thickness, wherein each of the plurality of resin composite plates is manufactured by
• producing a plurality of resin sheet groups, wherein each of the plurality of resin sheet groups is produced by stacking at least
• (1) a first fiber-reinforced thermoplastic resin sheet having a first thickness on
• (2) a second fiber-reinforced thermoplastic resin sheet having a second thickness which is different from the first thickness,
• each of the first and second fiber-reinforced thermoplastic resin sheets containing fibers arranged in one direction;
• laying the plurality of resin sheet groups side-by-side on a plane;
• and
• manufacturing each of said resin composite plates having the predetermined thickness by heating, under pressure, the plurality of resin sheet groups that are laid side-by-side on the plane, to integrate the plurality of resin sheet groups into a respective one of said resin composite plates;
• and
• manufacturing the article by heating, under pressure, at least one resin composite plate of the plurality of resin composite plates stacked together, with the at least one resin composite plate being clamped between dies, wherein
• the at least one resin composite plate (i) is one resin composite plate of the plurality of resin composite plates, or (ii) includes several resin composite plates of the plurality of resin composite plates stacked together, and
• in manufacturing the at least one resin composite plate, at least one resin sheet group among the plurality of resin sheet groups laid on the plane requires strength and differs from another resin sheet group not requiring strength among the plurality of resin sheet groups laid on the plane in a number of fiber-reinforced thermoplastic resin sheets that are stacked, so as to increase the strength of said at least one resin sheet group and to weaken the strength of said another resin sheet group.