Buffer material for packing

Abstract

A buffer material includes a first planar portion, a first buffer portion, and a second buffer portion. The first planar portion includes a first face that is flat, and an opening. The first buffer portion includes a first cylindrical portion. The first cylindrical portion has a cylindrical shape extending from an outer circumferential edge of the first planar portion, in a direction opposite thereto. The second buffer portion includes a second cylindrical portion. The second cylindrical portion is located on an inner side of the first cylindrical portion of the first buffer portion, and has a cylindrical shape extending from an inner circumferential edge of the first planar portion, in a direction opposite thereto.

What is claimed is: 
     
         1 . A buffer material comprising:
 a first planar portion includes a first face that is flat, and an opening;   a first buffer portion including a first cylindrical portion, having a cylindrical shape extending from an outer circumferential edge of the first planar portion, in a direction opposite thereto; and   a second buffer portion including a second cylindrical portion, located on an inner side of the first cylindrical portion of the first buffer portion, and having a cylindrical shape extending from an inner circumferential edge of the first planar portion, in a direction opposite thereto.   
     
     
         2 . The buffer material according to  claim 1 ,
 wherein a size of the first buffer portion along a direction of a perpendicular line to the first face of the first planar portion, and a size of the second buffer portion along the direction of the perpendicular line to the first face of the first planar portion, are equal to each other.   
     
     
         3 . The buffer material according to  claim 2 ,
 wherein the first cylindrical portion is inclined by a first angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the first cylindrical portion becomes larger in a direction away from the first planar portion,   the second cylindrical portion is inclined by a second angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the second cylindrical portion becomes larger in a direction toward the first planar portion, and   the first angle and the second angle are equal to each other.   
     
     
         4 . The buffer material according to  claim 2 ,
 wherein the first cylindrical portion is inclined by a first angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the first cylindrical portion becomes larger in a direction away from the first planar portion,   the second cylindrical portion is inclined by a second angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the second cylindrical portion becomes larger in a direction toward the first planar portion, and   the first angle and the second angle are different from each other.   
     
     
         5 . The buffer material according to  claim 4 ,
 wherein the first angle is larger than the second angle.   
     
     
         6 . The buffer material according to  claim 4 ,
 wherein the second angle is larger than the first angle.   
     
     
         7 . The buffer material according to  claim 2 ,
 wherein a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are equal to each other.   
     
     
         8 . The buffer material according to  claim 2 ,
 wherein a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are different from each other.   
     
     
         9 . The buffer material according to  claim 8 ,
 wherein the second thickness is thinner than the first thickness.   
     
     
         10 . The buffer material according to  claim 8 ,
 wherein the first thickness is thinner than the second thickness.   
     
     
         11 . The buffer material according to  claim 1 ,
 wherein a length of the second buffer portion along a direction of a perpendicular line to the first face of the first planar portion is shorter than a length of the first buffer portion along the direction of the perpendicular line to the first face of the first planar portion.   
     
     
         12 . The buffer material according to  claim 11 ,
 wherein the first cylindrical portion is inclined by a first angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the first cylindrical portion becomes larger in a direction away from the first planar portion,   the second cylindrical portion is inclined by a second angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the second cylindrical portion becomes larger in a direction toward the first planar portion, and   the first angle and the second angle are equal to each other.   
     
     
         13 . The buffer material according to  claim 11 ,
 wherein the first cylindrical portion is inclined by a first angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the first cylindrical portion becomes larger in a direction away from the first planar portion,   the second cylindrical portion is inclined by a second angle with respect to the perpendicular line to the first face of the first planar portion, such that a diameter of the second cylindrical portion becomes larger in a direction toward the first planar portion, and   the first angle and the second angle are different from each other.   
     
     
         14 . The buffer material according to  claim 13 ,
 wherein the first angle is larger than the second angle.   
     
     
         15 . The buffer material according to  claim 13 ,
 wherein the second angle is larger than the first angle.   
     
     
         16 . The buffer material according to  claim 11 ,
 wherein a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are equal to each other.   
     
     
         17 . The buffer material according to  claim 11 ,
 wherein a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are different from each other.   
     
     
         18 . The buffer material according to  claim 17 ,
 wherein the second thickness is thinner than the first thickness.   
     
     
         19 . The buffer material according to  claim 17 ,
 wherein the first thickness is thinner than the second thickness.   
     
     
         20 . The buffer material according to  claim 1 ,
 wherein the first buffer portion further includes a flange portion extending from an end portion of the first cylindrical portion on an opposite side of the first planar portion, to an outer side and parallel to the first face.