Packing case unit including buffer material

Abstract

A packing case unit including a case main body and a first buffer material. The first buffer material is formed of a pulp-molding material. The case main body includes a first buffer material mounting hole, a first covering portion, and a first fitting hole. To the first buffer material mounting hole, the first buffer material is inserted. The first covering portion includes a first main covering portion and a first fitting piece. The first main covering portion covers the first buffer material, by being folded. In the first fitting hole, the first fitting piece is fitted by being folded.

What is claimed is: 
     
         1 . A packing case unit comprising:
 a case main body formed of a cardboard plate material; and   a buffer material formed of a pulp-molding material with a mold, through a pulp molding process, and fixed to the case main body,   wherein the buffer material includes:
 a first planar portion including a first face which is flat; and 
 a buffer portion including a cylindrical portion having a cylindrical shape extending from an outer circumferential edge of the first planar portion, in a direction opposite to the first planar portion, and a flange portion extending from an end portion of the cylindrical portion on an opposite side of the first planar portion, to an outer side and parallel to the first face of the first planar portion, 
   the case main body includes:
 a main portion and 
 a buffer material fixing section formed in the main portion, and used to fix the buffer material, and 
   the buffer material fixing section includes:
 a buffer material mounting hole formed so as to penetrate through the main portion, to allow the buffer material to be inserted, with the first planar portion directed forward; 
 a covering portion including a main covering portion having a part of a perimeter thereof connected to the main portion, and a remaining part separated from the main portion, and configured to cover, by being folded along the part of the perimeter, at least a part of a surface of the flange portion on the opposite side of the first planar portion, of the buffer material inserted through the buffer material mounting hole, and a fitting piece extending outwardly from the main covering portion; and 
 a fitting hole formed so as to penetrate through the main portion, to allow the fitting piece, folded along a boundary with the main covering portion, to be fitted in the fitting hole. 
   
     
     
         2 . The packing case unit according to  claim 1 ,
 wherein the first planar portion of the buffer material includes a hole, and   the buffer material further includes another buffer portion, including:
 another cylindrical portion of a cylindrical shape, located on an inner side of the cylindrical portion of the buffer portion, and extending from an inner circumferential edge of the first planar portion in the direction opposite to the first planar portion; and 
 a second planar portion extending inwardly from an end portion of the other cylindrical portion on the opposite side of the first planar portion, parallel to the first face of the first planar portion. 
   
     
     
         3 . The packing case unit according to  claim 1 ,
 wherein the packing case unit further includes another buffer material different from the buffer material,   the other buffer material includes:
 another first planar portion including another first face which is flat; and 
 a third buffer portion including a third cylindrical portion having a cylindrical shape extending from an outer circumferential edge of the other first planar portion, in the direction opposite to the other first planar portion, and a second flange portion extending from an end portion of the third cylindrical portion on the opposite side of the other first planar portion, to an outer side and parallel to the other first face of the other first planar portion, 
   the case main body further includes another buffer material fixing section different from the buffer material fixing section,   the other buffer material fixing section includes:
 a second buffer material mounting hole formed so as to penetrate through the main portion, to allow the other buffer material to be inserted, with the other first planar portion directed forward; 
 a second covering portion including a second main covering portion having a part of a perimeter thereof connected to the main portion, and a remaining part separated from the main portion, and configured to cover, by being folded along the part of the perimeter, at least a part of a surface of the second flange portion on the opposite side of the other first planar portion, of the other buffer material inserted through the second buffer material mounting hole, and a second fitting piece extending outwardly from the second main covering portion; and 
 a second fitting hole formed so as to penetrate through the main portion, to allow the second fitting piece, folded along a boundary with the second main covering portion, to be fitted in the second fitting hole, 
   the cylindrical portion of the buffer material has a circular cylindrical shape, the third cylindrical portion of the other buffer material has a circular cylindrical shape, and a maximum size of an outer diameter of the cylindrical portion and a maximum size of an outer diameter of the third cylindrical portion are different from each other, and   a size of the buffer material mounting hole corresponds to the maximum size of the outer diameter of the cylindrical portion, and a size of the second buffer material mounting hole corresponds to the maximum size of the outer diameter of the third cylindrical portion.   
     
     
         4 . The packing case unit according to  claim 2 ,
 wherein a size of the buffer portion along a direction of a perpendicular line to the first face of the first planar portion, and a size of the other buffer portion along the direction of the perpendicular line to the first face of the first planar portion, are equal to each other.