Buffer material and buffer material structure

Abstract

A buffer material is formed by assembling four buffer members containing cellulose fibers and having a plate shape, in which the cellulose fibers are oriented along a main surface of the buffer member, a first buffer member and a third buffer member among the four buffer members are spaced apart from each other and have the respective main surfaces disposed along each other, and a second buffer member and a fourth buffer member are spaced apart from each other and have the respective main surfaces disposed along each other, a rectangular frame shape is shown when viewed in a plan view from a direction along a Z axis, and an article is stored in a region surrounded by the four buffer members in the plan view.

What is claimed is: 
     
         1 . A buffer material formed by assembling four buffer members containing cellulose fibers and having a plate shape, wherein
 the cellulose fibers are oriented along a main surface of the buffer member,   two buffer members among the four buffer members are spaced apart from each other and have the respective main surfaces disposed along each other, and the other two buffer members are spaced apart from each other and have the respective main surfaces disposed along each other,   a rectangular frame shape is shown when viewed in a plan view from a direction orthogonal to a normal direction of all four main surfaces of the four buffer members, and   an article is stored in a region surrounded by the four buffer members in the plan view.   
     
     
         2 . The buffer material according to  claim 1 , wherein
 the four buffer members have the same shape having a first notch portion on a first side and a second notch portion on a second side that is along the first side and faces the first side,   the first notch portion and the second notch portion are disposed diagonally in the buffer member when the main surface is viewed in a side view from the normal direction,   the four buffer members include a first buffer member, a second buffer member, a third buffer member, and a fourth buffer member, and   the buffer material is assembled by fitting the second notch portion of the first buffer member and first notch portion of the second buffer member together, fitting the second notch portion of the second buffer member and the first notch portion of the third buffer member together, fitting the second notch portion of the third buffer member and the first notch portion of the fourth buffer member together, and fitting the second notch portion of the fourth buffer member and the first notch portion of the first buffer member together.   
     
     
         3 . The buffer material according to  claim 2 , wherein
 in the first notch portion and the second notch portion, a width A orthogonal to the first side or the second side is equal to or less than a thickness B of the buffer member, and   in a direction along the first side, a sum of a depth L 1  of the first notch portion and a depth L 2  of the second notch portion is equal to or less than a length K of the buffer member.   
     
     
         4 . The buffer material according to  claim 1 , wherein
 the four buffer members have the same shape having a recess portion on a first side and a protrusion portion on a second side that is along the first side and faces the first side,   the recess portion and the protrusion portion are disposed to face each other in a direction orthogonal to the first side and the second side when the main surface is viewed in a side view from the normal direction,   the four buffer members include a first buffer member, a second buffer member, a third buffer member, and a fourth buffer member, and   the buffer material is assembled by fitting the protrusion portion of the first buffer member and the recess portion of the second buffer member together, fitting the protrusion portion of the second buffer member and the recess portion of the third buffer member together, fitting the protrusion portion of the third buffer member and the recess portion of the fourth buffer member together, and fitting the protrusion portion of the fourth buffer member and the recess portion of the first buffer member together.   
     
     
         5 . The buffer material according to  claim 1 , wherein
 the four buffer members include a first buffer member, a second buffer member, a third buffer member, and a fourth buffer member,   the first buffer member and the third buffer member have the same shape having a first recess portion on a first side and a second recess portion on a second side that is along the first side and faces the first side,   the second buffer member and the fourth buffer member have the same shape having a first protrusion portion on a third side and a second protrusion portion on a fourth side that is along the third side and faces the third side,   the first side and the third side are disposed along each other,   the first recess portion, the second recess portion, the first protrusion portion, and the second protrusion portion are disposed to correspond to each other in a direction along the first side, and   the buffer material is assembled by fitting the second recess portion of the first buffer member and the first protrusion portion of the second buffer member together, fitting the second protrusion portion of the second buffer member and the first recess portion of the third buffer member together, fitting the second recess portion of the third buffer member and the first protrusion portion of the fourth buffer member together, and fitting the second protrusion portion of the fourth buffer member and the first recess portion of the first buffer member together.   
     
     
         6 . A buffer material structure formed by assembling four buffer members containing cellulose fibers and having a plate shape, wherein
 the cellulose fibers are oriented along a main surface of the buffer member,   two buffer members among the four buffer members are spaced apart from each other and have the respective main surfaces disposed along each other, and the other two buffer members are spaced apart from each other and have the respective main surfaces disposed along each other,   a frame shape is shown when viewed in a plan view from a direction orthogonal to a normal direction of all four main surfaces of the four buffer members, and   in the plan view, an article is stored in a region surrounded by the four buffer members.