Resin panel and sandwich panel

Abstract

The resin panel of the present invention includes a first structure 15 A and a second structure 15 B stacked on each other. The structures include reference surfaces that serve as the front surface and the back surface of the resin panel respectively. Each of the structures includes a plurality of protrusions 150 a , 150 b protruding inwardly from the reference surface. The protrusions 150 a of the structure 15 A face the protrusions 150 b of the other structure 15 B each other. Jutting portions Rb of linear shape are formed between adjacent protrusions of each of the structures. The structures 15 A, 15 B are joined such that apical portions of the protrusions of each structure abut one another.

What is claimed is: 
     
         1 . A resin panel including a first structure and a second structure stacked on each other, wherein:
 the structures include reference surfaces that serve as the front surface and the back surface of the resin panel respectively;   each of the structures includes a plurality of protrusions protruding inwardly from the reference surface, the protrusions of one of the structures facing those of the other structure;   the structures are joined such that apical portions of the protrusions of one of the structures abut apical portions of the protrusions of the other structure; and   jutting portions of linear shape are formed between adjacent protrusions of each of the structures.   
     
     
         2 . The resin panel according to  claim 1 , wherein a plurality of the jutting portions of linear shape are formed for each of the protrusions, at least two of the jutting portions not extending in two opposite directions. 
     
     
         3 . The resin panel according to  claim 1 , wherein the jutting portions of linear shape formed for each of the protrusions extend in two opposite directions. 
     
     
         4 . The resin panel according to  claim 1 , wherein the resin panel is made from expanded material. 
     
     
         5 . A sandwich panel comprising resin sheets and a resin panel sandwiched between the resin sheets, the resin panel including a first structure and a second structure stacked on each other, wherein:
 the structures include reference surfaces that serve as the front surface and the back surface of the resin panel respectively;   each of the structures includes a plurality of protrusions protruding inwardly from the reference surface, the protrusions of one of the structures facing those of the other structure;   the structures are joined such that apical portions of the protrusions of one of the structures abut apical portions of the protrusions of the other structure; and   jutting portions of linear shape are formed between adjacent protrusions of each of the structures.