Patent Publication Number: US-2023141442-A1

Title: Cushioning material, packing material, and packed goods

Description:
The present application is based on, and claims priority from JP Application Serial Number 2021-182458, filed Nov. 9, 2021, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a cushioning material, a packing material, and packed goods. 
     2. Related Art 
     A cushioning material for being put into a packing box configured for encasement of electronic equipment so as to absorb external stress applied to the electronic equipment is known. For example, JP-A-2018-131268 discloses a technique for absorbing external stress applied to the electronic equipment by means of a cushioning material that includes two plate-like members. 
     However, in related art, the structure is hollow in between the two plate-like members. For this reason, in related art, it could happen that the two plate-like members come into contact with each other when the cushioning material is under external stress, resulting in failing to absorb the external stress. 
     SUMMARY 
     Provided by a certain aspect of the present disclosure is a cushioning material for being put into a packing box configured for encasement of electronic equipment, the cushioning material being configured to absorb external stress applied to the electronic equipment encased in the packing box, the cushioning material comprising: a first holder including a first plate configured to face the electronic equipment when the cushioning material and the electronic equipment are encased in the packing box, and a second plate configured to face an inner wall surface of the packing box when the cushioning material and the electronic equipment are encased in the packing box; and a first cushioning block provided between the first plate and the second plate. 
     Also provided by a certain aspect of the present disclosure is a packing material, comprising: a packing box configured for encasement of electronic equipment; and a cushioning material for being put into the packing box and configured to absorb external stress applied to the electronic equipment encased in the packing box, the cushioning material including a first holder including a first plate configured to face the electronic equipment when the cushioning material and the electronic equipment are encased in the packing box, and a second plate configured to face an inner wall surface of the packing box when the cushioning material and the electronic equipment are encased in the packing box; and a first cushioning block provided between the first plate and the second plate. 
     Also provided by a certain aspect of the present disclosure is packed goods, comprising: electronic equipment; a packing box configured for encasement of the electronic equipment; and a cushioning material for being put into the packing box and configured to absorb external stress applied to the electronic equipment encased in the packing box, the cushioning material including a first holder including a first plate configured to face the electronic equipment when the cushioning material and the electronic equipment are encased in the packing box, and a second plate configured to face an inner wall surface of the packing box when the cushioning material and the electronic equipment are encased in the packing box; and a first cushioning block provided between the first plate and the second plate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is an exploded perspective view illustrating an example of a structure of a packing material according to an exemplary embodiment of the present disclosure. 
         FIG.  2    is a perspective view illustrating an example of a structure of a cushioning material S. 
         FIG.  3    is a plan view illustrating an example of a shape of a flat plate-like member HH. 
         FIG.  4    is a cross-sectional view illustrating an example of a structure of the cushioning material S. 
         FIG.  5    is a cross-sectional view illustrating an example of a structure of a cushioning material SW according to a referential example. 
         FIG.  6    is an exploded perspective view illustrating an example of a structure of a cushioning material SA according to a modification example 1 of the present disclosure. 
         FIG.  7    is a perspective view illustrating an example of the structure of the cushioning material SA. 
         FIG.  8    is an exploded perspective view illustrating an example of a structure of a cushioning material SB according to a modification example 2 of the present disclosure. 
         FIG.  9    is a perspective view illustrating an example of the structure of the cushioning material SB. 
         FIG.  10    is an exploded perspective view illustrating an example of a structure of a packing material according to a modification example 3 of the present disclosure. 
         FIG.  11    is a plan view illustrating an example of a shape of a flat plate-like member HHC. 
         FIG.  12    is an exploded perspective view illustrating an example of a structure of a packing material according to a modification example 4 of the present disclosure. 
         FIG.  13    is a plan view illustrating an example of a shape of a flat plate-like member HHD. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     With reference to the accompanying drawings, some exemplary embodiments of the present disclosure will now be explained. In the drawings, the dimensions and scales of components may be made different from those in actual implementation. Since the embodiment described below shows some preferred examples of the present disclosure, they contain various technically-preferred limitations. However, the scope of the present disclosure shall not be construed to be limited to the examples described below unless and except where the description contains an explicit mention of an intent to limit the present disclosure. 
     A. EXEMPLARY EMBODIMENT 
     With reference to  FIGS.  1  to  4   , an example of a structure of a packing material  1  according to a present embodiment will now be explained. 
     1. Packed Goods 
       FIG.  1    is an exploded perspective view illustrating an example of a structure of a packing material  1 . 
     As illustrated in  FIG.  1   , the packing material  1  is used for encasement of electronic equipment  100 . Specifically, the packing material  1  includes a packing box  2  configured for encasement of the electronic equipment  100 , and includes plural pieces of cushioning material S configured to absorb external stress applied to the electronic equipment  100  encased in the packing box  2 . 
     One example of the electronic equipment  100  is a printing apparatus such as an ink-jet printer. However, the electronic equipment  100  according to the present embodiment is not limited thereto. It may be any equipment other than a printing apparatus, for example, a television set, a refrigerator, a washing machine, a microwave, a personal computer, or the like. 
     A collective term “packed goods” may be hereinafter used for collectively referring to, together with the packing material  1 , the electronic equipment  100  that is in an encased state by being packed using the packing material  1 . 
     As illustrated in  FIG.  1   , in the present embodiment, it is assumed that the packing material  1  includes eight pieces of cushioning material S- 1  to S- 8 . In the present embodiment, the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are put into the packing box  2  through an opening  20  of the packing box  2 , thereby becoming encased in the packing box  2 . 
     For easier understanding, the description below will be given with reference to a packing box coordinate system W fixed to the packing box  2 . The packing box coordinate system ΣW introduced herein is a triaxial coordinate system that includes a Zw axis, which extends in a +Zw direction, an Xw axis, which extends in an +Xw direction orthogonal to the +Zw direction, and a Yw axis, which extends in a +Yw direction orthogonal to the +Zw direction and the +Xw direction. The +Zw direction is a direction from the bottom of the packing box  2  toward its opening  20 . In the description below, the direction that is the opposite of the +Xw direction will be referred to as “−Xw direction”, the direction that is the opposite of the +Yw direction will be referred to as “−Yw direction”, and the direction that is the opposite of the +Zw direction will be referred to as “−Zw direction”. 
     The description below will be given also with reference to a cushioning material coordinate system ΣS fixed to the cushioning material S. The cushioning material coordinate system ΣS introduced herein is a triaxial coordinate system that includes a Zs axis, which extends in a +Zs direction, an Xs axis, which extends in an +Xs direction orthogonal to the +Zs direction, and a Ys axis, which extends in a +Ys direction orthogonal to the +Zs direction and the +Xs direction. In the description below, the direction that is the opposite of the +Xs direction will be referred to as “−Xs direction”, the direction that is the opposite of the +Ys direction will be referred to as “−Ys direction”, and the direction that is the opposite of the +Zs direction will be referred to as “−Zs direction”. 
     As illustrated in  FIG.  1   , the cushioning material S- 1  is a cushioning material S that supports one lower corner portion of the electronic equipment  100  at a position on the −Zw side of the electronic equipment  100  and on the −Xw side and the −Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 1  fixed to the cushioning material S- 1  is provided such that the +Zs direction is in line with the −Zw direction, the +Xs direction is in line with the −Yw direction, and the +Ys direction is in line with the −Xw direction. 
     The cushioning material S- 2  is a cushioning material S that supports another one lower corner portion of the electronic equipment  100  at a position on the −Zw side of the electronic equipment  100  and on the −Xw side and the +Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 2  fixed to the cushioning material S- 2  is provided such that the +Zs direction is in line with the −Zw direction, the +Xs direction is in line with the −Xw direction, and the +Ys direction is in line with the +Yw direction. 
     The cushioning material S- 3  is a cushioning material S that supports another one lower corner portion of the electronic equipment  100  at a position on the −Zw side of the electronic equipment  100  and on the +Xw side and the +Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 3  fixed to the cushioning material S- 3  is provided such that the +Zs direction is in line with the −Zw direction, the +Xs direction is in line with the +Yw direction, and the +Ys direction is in line with the +Xw direction. 
     The cushioning material S- 4  is a cushioning material S that supports another one lower corner portion of the electronic equipment  100  at a position on the −Zw side of the electronic equipment  100  and on the +Xw side and the −Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 4  fixed to the cushioning material S- 4  is provided such that the +Zs direction is in line with the −Zw direction, the +Xs direction is in line with the +Xw direction, and the +Ys direction is in line with the −Yw direction. 
     The cushioning material S- 5  is a cushioning material S that supports one upper corner portion of the electronic equipment  100  at a position on the +Zw side of the electronic equipment  100  and on the −Xw side and the +Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 5  fixed to the cushioning material S- 5  is provided such that the +Zs direction is in line with the +Zw direction, the +Xs direction is in line with the +Yw direction, and the +Ys direction is in line with the −Xw direction. 
     The cushioning material S- 6  is a cushioning material S that supports another one upper corner portion of the electronic equipment  100  at a position on the +Zw side of the electronic equipment  100  and on the −Xw side and the −Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 6  fixed to the cushioning material S- 6  is provided such that the +Zs direction is in line with the +Zw direction, the +Xs direction is in line with the −Xw direction, and the +Ys direction is in line with the −Yw direction. 
     The cushioning material S- 7  is a cushioning material S that supports another one upper corner portion of the electronic equipment  100  at a position on the +Zw side of the electronic equipment  100  and on the +Xw side and the −Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 7  fixed to the cushioning material S- 7  is provided such that the +Zs direction is in line with the +Zw direction, the +Xs direction is in line with the −Yw direction, and the +Ys direction is in line with the +Xw direction. 
     The cushioning material S- 8  is a cushioning material S that supports another one upper corner portion of the electronic equipment  100  at a position on the +Zw side of the electronic equipment  100  and on the +Xw side and the +Yw side of the electronic equipment  100  when the electronic equipment  100  and the eight pieces of cushioning material S- 1  to S- 8  are encased in the packing box  2 . The cushioning material coordinate system ΣS- 8  fixed to the cushioning material S- 8  is provided such that the +Zs direction is in line with the +Zw direction, the +Xs direction is in line with the +Xw direction, and the +Ys direction is in line with the +Yw direction. 
     2. Cushioning Material 
       FIG.  2    is a perspective view illustrating an example of a structure of the cushioning material S. 
     As illustrated in  FIG.  2   , the cushioning material S includes a plurality of cushioning blocks R for absorbing external stress applied to the electronic equipment  100  and a plurality of holders H for holding the plurality of cushioning blocks R respectively. In the present embodiment, a case where the cushioning material S includes three holders H 1 , H 2 , and H 3  is assumed as an example. 
     The holder H 1  includes a holder plate P 1 , a holder plate P 2 , and a link plate Ps 1 . The holder plate P 1  is disposed such that a line normal to it goes in the +Zs direction. The holder plate P 2  constitutes a part of the +Zs-side face of the cushioning material S and is disposed at a +Zs-side position with respect to the holder plate P 1  such that a line normal to it goes in the +Zs direction. The link plate Ps 1  links the holder plate P 1  and the holder plate P 2  to each other. 
     The holder H 2  includes a holder plate P 3 , a holder plate P 4 , and a link plate Ps 2 . The holder plate P 3  is disposed such that a line normal to it goes in the +Xs direction. The holder plate P 4  constitutes a part of the +Xs-side face of the cushioning material S and is disposed at a +Xs-side position with respect to the holder plate P 3  such that a line normal to it goes in the +Xs direction. The link plate Ps 2  links the holder plate P 3  and the holder plate P 4  to each other. 
     The holder H 3  includes a holder plate P 5 , a holder plate P 6 , and a link plate Ps 3 . The holder plate P 5  is disposed such that a line normal to it goes in the +Ys direction. The holder plate P 6  constitutes a part of the +Ys-side face of the cushioning material S and is disposed at a +Ys-side position with respect to the holder plate P 5  such that a line normal to it goes in the +Ys direction. The link plate Ps 3  links the holder plate P 5  and the holder plate P 6  to each other. 
     The holder plates P 1  to P 6  and the link plates Ps 1 , Ps 2 , and Ps 3  may be hereinafter collectively referred to as “holder plate(s) P”. In the present embodiment, a case where each of the plurality of holder plates P constituting the holders H is made of corrugated cardboard is assumed as an example. 
     As illustrated in  FIG.  2   , in the present embodiment, it is assumed that the cushioning material S has three cushioning blocks, specifically, a cushioning block R 1  held by the holder H 1 , a cushioning block R 2  held by the holder H 2 , and a cushioning block R 3  held by the holder H 3 . 
     The cushioning block R 1  is held by the holder H 1  between the holder plate P 1  and the holder plate P 2 . In the present embodiment, a case where the cushioning block R 1  is held by the holder H 1  by bonding the −Zs-side end of the cushioning block R 1  to the holder plate P 1  by means of adhesive and by bonding the +Zs-side end of the cushioning block R 1  to the holder plate P 2  by means of adhesive is assumed as an example. 
     The cushioning block R 2  is held by the holder H 2  between the holder plate P 3  and the holder plate P 4 . In the present embodiment, a case where the cushioning block R 2  is held by the holder H 2  by bonding the −Xs-side end of the cushioning block R 2  to the holder plate P 3  by means of adhesive and by bonding the +Xs-side end of the cushioning block R 2  to the holder plate P 4  by means of adhesive is assumed as an example. 
     The cushioning block R 3  is held by the holder H 3  between the holder plate P 5  and the holder plate P 6 . In the present embodiment, a case where the cushioning block R 3  is held by the holder H 3  by bonding the −Ys-side end of the cushioning block R 3  to the holder plate P 5  by means of adhesive and by bonding the +Ys-side end of the cushioning block R 3  to the holder plate P 6  by means of adhesive is assumed as an example. 
     In the present embodiment, it is assumed that the cushioning block R is made of a material having lower elasticity than styrene foam. 
     In the present embodiment, the following case is assumed as an example: fibers contained in a matter/material are obtained by defibrating the matter/material such as paper, clothes, or the like containing various kinds of fibers such as animal-based fibers, plant-based fibers, chemical fibers, or the like, and then the obtained fibers are processed, thereby forming the cushioning blocks R. More specifically, in the present embodiment, it is assumed that fibers contained in paper are obtained by defibrating the paper, and then the obtained fibers are hardened, thereby forming the cushioning blocks R. 
     As described above, in the present embodiment, the cushioning blocks R are produced by going through a process of obtaining fibers from a fiber-containing matter/material such as paper, clothes, or the like. That is, in the present embodiment, when a fiber-containing matter/material such as paper, clothes, or the like is thrown away, it is possible to produce the cushioning blocks R by recycling this matter/material. Therefore, the scheme of the present embodiment makes it possible to reduce environmental burdens pertinent to production and disposal of the cushioning blocks R. 
     In the present embodiment, the holder plate P 1 , the holder plate P 3 , and the holder plate P 5  face the electronic equipment  100  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . A cavity AN is formed in the holder plate P 1 , the holder plate P 3 , and the holder plate P 5  at a position that corresponds to each corner of the electronic equipment  100  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 2 , the holder plate P 4 , and the holder plate P 6  face inner wall surfaces of the packing box  2  respectively when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . 
     In the present embodiment, the holder H 1  is an example of “a first holder”, and the holder H 2  is an example of “a second holder”. In the present embodiment, the holder plate P 1  is an example of “a first plate”, the holder plate P 2  is an example of “a second plate”, the holder plate P 3  is an example of “a third plate”, and the holder plate P 4  is an example of “a fourth plate”. In the present embodiment, the cushioning block R 1  is an example of “a first cushioning block”, and the cushioning block R 2  is an example of “a second cushioning block”. In the present embodiment, the +Zs direction is an example of “a first direction”, and the +Xs direction is an example of “a second direction”. 
       FIG.  3    is a plan view illustrating an example of a shape of a flat plate-like member HH. 
     In the present embodiment, for example, it is assumed that the holders H 1 , H 2 , and H 3  of the cushioning material S are formed by folding a single flat plate-like member HH illustrated as an example in  FIG.  3    along fold lines θ 11  to θ 32  illustrated as an example in  FIG.  3   . As described earlier, in the present embodiment, a case where the flat plate-like member HH is made of corrugated cardboard is assumed as an example. 
     As illustrated in  FIG.  3   , besides the holder plates P 1  to P 6  and the link plates Ps 1 , Ps 2 , and Ps 3 , which have been described with reference to  FIG.  2   , the flat plate-like member HH includes a link plate Pc 12 . In  FIG.  3   , the following case is assumed as an example: a case where the cushioning material coordinate system ΣS is a coordinate system fixed to the holder plate P 2  and where the flat plate-like member HH is obtained by developing (flattening) the holders H 1 , H 2 , and H 3  in a state in which the cushioning material coordinate system ΣS is fixed to the holder plate P 2 . 
     As described above, the holder H 1  includes the holder plate P 1 , the holder plate P 2 , and the link plate Ps 1 . The holder H 1  further includes the link plate Pc 12 . As illustrated in  FIG.  3   , the holder plate P 2  is continuous to the link plate Ps 1  across the fold line θ 11 , the link plate Ps 1  is continuous to the holder plate P 1  across the fold line θ 12 , and the holder plate P 1  is continuous to the link plate Pc 12  across the fold line θ 13 . 
     As described above, the holder H 2  includes the holder plate P 3 , the holder plate P 4 , and the link plate Ps 2 . As illustrated in  FIG.  3   , the holder plate P 3  is continuous to the link plate Ps 2  across the fold line θ 21 , and the link plate Ps 2  is continuous to the holder plate P 4  across the fold line θ 22 . 
     As described above, the holder H 3  includes the holder plate P 5 , the holder plate P 6 , and the link plate Ps 3 . As illustrated in  FIG.  3   , the holder plate P 5  is continuous to the link plate Ps 3  across the fold line θ 32 , and the link plate Ps 3  is continuous to the holder plate P 6  across the fold line θ 31 . 
     In the present embodiment, the fold line θ 13  is a mountain fold line, and those other than the fold line θ 13  are valley fold lines. The term “valley fold line” as used herein means a fold line at which the flat plate-like member HH is folded along this fold line toward the near side in  FIG.  3   , that is, toward the +Zs direction, for the two plate members adjoining each other across this fold line in a process of forming the holders H 1 , H 2 , and H 3  from the flat plate-like member HH. The term “mountain fold line” as used herein means a fold line at which the flat plate-like member HH is folded along this fold line toward the opposite side in  FIG.  3   , that is, toward the −Zs direction, for the two plate members adjoining each other across this fold line in a process of forming the holders H 1 , H 2 , and H 3  from the flat plate-like member HH. 
     As illustrated in  FIG.  3   , the holder plate P 1  has an arched recessed portion OB 1 , the holder plate P 2  has a protruding portion TK 1 , the link plate Pc 12  has a recessed portion KB 3 , and there is an opening KK 2  on the fold line θ 12 , which is the border between the holder plate P 1  and the link plate Ps 1 . The holder plate P 3  has an arched recessed portion OB 2 , the holder plate P 4  has a protruding portion TK 2 , and there is an opening KK 3  on the fold line θ 21 , which is the border between the holder plate P 3  and the link plate Ps 2 . The holder plate P 5  has an arched recessed portion OB 3 , the holder plate P 6  has a protruding portion TK 3 , and there is an opening KK 1  on the fold line θ 32 , which is the border between the holder plate P 5  and the link plate Ps 3 . 
     The flat plate-like member HH is folded along the fold line θ 13  in a mountain-folding manner and along the fold lines other than the fold line θ 13 , specifically, along the fold lines θ 11 , θ 12 , θ 14 , θ 21 , θ 22 , θ 23 , θ 31 , and θ 32 , in a valley-folding manner, thereby fitting the protruding portion TK 1  into the opening KK 1 , fitting the protruding portion TK 2  into the opening KK 2 , and fitting the protruding portion TK 3  into the opening KK 3  and the recessed portion KB 3 . In addition, the cavity AN is formed of the recessed portions OB 1 , OB 2 , OB 3  by folding the flat plate-like member HH along the fold lines θ 11  to θ 32 . 
     When the flat plate-like member HH is folded along the fold lines θ 11  to θ 32 , one end of the cushioning block R 1  is bonded to an area Ar 1  of the holder plate P 1 , and the other end of the cushioning block R 1  is bonded to an area Ar 2  of the holder plate P 2 , thereby holding the cushioning block R 1  by the holder H 1 . In addition, when the flat plate-like member HH is folded along the fold lines θ 11  to θ 32 , one end of the cushioning block R 2  is bonded to an area Ar 3  of the holder plate P 3 , and the other end of the cushioning block R 2  is bonded to an area Ar 4  of the holder plate P 4 , thereby holding the cushioning block R 2  by the holder H 2 . In addition, when the flat plate-like member HH is folded along the fold lines θ 11  to θ 32 , one end of the cushioning block R 3  is bonded to an area Ar 5  of the holder plate P 5 , and the other end of the cushioning block R 3  is bonded to an area Ar 6  of the holder plate P 6 , thereby holding the cushioning block R 3  by the holder H 3 . 
       FIG.  4    is a cross-sectional view illustrating an example of a cross section of the cushioning material S taken along a plane perpendicular to the +Ys direction and passing through the cushioning block R 1  and the cushioning block R 2 . 
     As illustrated in  FIG.  4   , in the cushioning material S according to the present embodiment, the −Zs-side end of the cushioning block R 1  is bonded to the holder plate P 1 , the +Zs-side end of the cushioning block R 1  is bonded to the holder plate P 2 , and the holder plate P 1  and the holder plate P 2  are linked to each other by the link plate Ps 1 . 
     For the purpose of explaining one of the effects of the present embodiment, a cushioning material SW of a packing material  1 W according to a referential example will now be considered. 
       FIG.  5    is a cross-sectional view illustrating an example of a cross section of a cushioning material SW of a packing material  1 W according to a referential example. The packing material  1 W is different from the packing material  1  according to the exemplary embodiment in that it includes plural pieces of cushioning material SW in place of the plural pieces of cushioning material S. 
     As illustrated in  FIG.  5   , the cushioning material SW according to the referential example is different from the cushioning material S according to the exemplary embodiment in that the holder H 1  does not include the holder plate P 2  and the link plate Ps 1  and in that the holder H 2  does not include the holder plate P 4  and the link plate Ps 2 . That is, in the packing material  1 W according to the referential example, the −Zs-side end of the cushioning block R 1  is bonded to the holder plate P 1 , the +Zs-side end of the cushioning block R 1  is in contact with an inner wall surface of the packing box  2 . 
     For example, when external stress is applied to the cushioning block R 1  of the cushioning material SW according to the referential example via the packing box  2  or the electronic equipment  100 , in some instances positional displacement of one end of the cushioning block R 1  could occur. 
     Then, when the positional displacement of the one end of the cushioning block R 1  occurs due to the external stress applied to the cushioning block R 1  of the cushioning material SW according to the referential example via the packing box  2  or the electronic equipment  100 , it could happen that the other end of the cushioning block R 1  fails to follow the positional displacement of the one end of the cushioning block R 1 . If the other end of the cushioning block R 1  fails to follow the positional displacement of the one end of the cushioning block R 1 , it follows that the other end of the cushioning block R 1  is located relatively on the +Xs side or on the −Xs side with respect to the one end of the cushioning block R 1 . For this reason, when external stress is applied to the cushioning block R 1  of the cushioning material SW according to the referential example via the packing box  2  or the electronic equipment  100 , there is a possibility that the cushioning block R 1  might come off the holder plate P 1  or the packing box  2 . In the cushioning material SW according to the referential example, also for the cushioning blocks R other than the cushioning block R 1 , similarly to the cushioning block R 1 , there is a possibility of coming off the holder plate P 1  or the packing box  2  due to external stress applied thereto via the packing box  2  or the electronic equipment  100 . 
     By contrast, in the cushioning material S according to the present embodiment, as described earlier, one end of the cushioning block R 1  is bonded to the holder plate P 1 , the other end of the cushioning block R 1  is bonded to the holder plate P 2 , and the holder plate P 1  and the holder plate P 2  are linked to each other by the link plate Ps 1 . 
     For this reason, in the present embodiment, even when the positional displacement of the one end of the cushioning block R 1  occurs due to external stress applied to the cushioning block R 1  via the packing box  2  or the electronic equipment  100 , the other end of the cushioning block R 1  follows the positional displacement of the one end of the cushioning block R 1  through the intermediary of the holder plate P 1 , the link plate Ps 1 , and the holder plate P 2  and thus becomes displaced. Therefore, the present embodiment makes it possible to reduce the risk of coming off of the cushioning block R 1  from the holder plate P 1  or the holder plate P 2 , to which the cushioning block R 1  is bonded, due to the external stress applied to the packing box  2  or the electronic equipment  100 , as compared with the referential example. Similarly, also for the cushioning blocks R other than the cushioning block R 1 , the present embodiment makes it possible to reduce the risk of coming off of this cushioning block R from the holder H, to which this cushioning block R is bonded, due to the external stress applied to the packing box  2  or the electronic equipment  100 , as compared with the referential example. 
     In the present embodiment, the cushioning block R 1  is provided between the holder plate P 1  and the holder plate P 2 . Therefore, as compared with a structure in which the cushioning block R 1  is not provided between the holder plate P 1  and the holder plate P 2 , the present embodiment makes it possible to absorb the external stress applied to the electronic equipment  100  more reliably. That is, in the present embodiment, the cushioning block R is provided between the plurality of holder plates P of the holder H. Therefore, as compared with a structure in which the cushioning block R is not provided between the plurality of holder plates P of the holder H, the present embodiment makes it possible to absorb the external stress applied to the electronic equipment  100  more reliably. 
     In the present embodiment, the link plate Ps 1  is provided at an area different from an area where the electronic equipment  100  and the packing box  2  overlap each other when the packing material  1  is viewed in the −Zs direction. More specifically, in the present embodiment, the link plate Ps 1  is provided relatively on the +Xs side with respect to the electronic equipment  100  when the packing material  1  is viewed in the −Zs direction. Therefore, in the present embodiment, it is possible to absorb, by the cushioning block R 1 , external stress applied to the electronic equipment  100  and to prevent the link plate Ps 1  from having an influence on the absorption of the external stress applied to the electronic equipment  100 . Therefore, in the present embodiment, in order to achieve efficient absorption of the external stress by the cushioning material S, just taking the absorption of the external stress applied to the electronic equipment  100  by the cushioning block R 1  into consideration suffices. This makes the design of the cushioning material S easier, as compared with a structure in which the external stress applied to the electronic equipment  100  is absorbed both by the link plate Ps 1  and by the cushioning block R 1 . Similarly, in the present embodiment, the link plate Ps 2  is provided relatively on the +Ys side with respect to the electronic equipment  100 , the link plate Ps 3  is provided relatively on the +Zs side with respect to the electronic equipment  100 , and, therefore, the design of the cushioning material S is easier, as compared with a structure in which the external stress applied to the electronic equipment  100  is absorbed both by the link plate Ps and by the cushioning block R. 
     3. Conclusion of First Embodiment 
     As described above, the cushioning material S according to the present embodiment is a cushioning material for being put into the packing box  2  configured for encasement of the electronic equipment  100 . The cushioning material is configured to absorb external stress applied to the electronic equipment  100  encased in the packing box  2 . The cushioning material comprises the holder H 1  and the cushioning block R 1 . The holder H 1  includes the holder plate P 1  and the holder plate P 2 . The holder plate P 1  is configured to face the electronic equipment  100  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 2  is configured to face an inner wall surface of the packing box  2  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 1  is provided between the holder plate P 1  and the holder plate P 2 . 
     Therefore, as compared with a structure in which the cushioning block R 1  is not provided between the holder plate P 1  and the holder plate P 2 , the present embodiment makes it possible to absorb the external stress applied to the electronic equipment  100  more reliably. 
     The cushioning material S according to the present embodiment further comprises the holder H 2  and the cushioning block R 2 . The holder H 2  includes the holder plate P 3  and the holder plate P 4 . The holder plate P 3  is configured to face the electronic equipment  100  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 4  is configured to face an inner wall surface of the packing box  2  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 2  is provided between the holder plate P 3  and the holder plate P 4 . The cushioning block R 1  extends in the +Zs direction going from the holder plate P 1  toward the holder plate P 2 . The cushioning block R 2  extends in the +Xs direction going from the holder plate P 3  toward the holder plate P 4 . The holder H 1  and the holder H 2  are made of a single flat plate-like member HH. 
     Therefore, the present embodiment makes it possible to make parts management needed for the manufacturing of the cushioning material S simpler, as compared with a case where the cushioning material S is made up of a plurality of members. Moreover, the present embodiment makes it possible to make the management of waste produced at the time of disposal of the cushioning material S simpler, as compared with a case where the cushioning material S is made up of a plurality of members. 
     In the cushioning material S according to the present embodiment, the cavity AN is formed in the holder plate P 1  and the holder plate P 3  at a position that corresponds to one of a plurality of corners of the electronic equipment  100  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . More specifically, in the cushioning material S according to the present embodiment, the recessed portion OB 1  is provided in the holder plate P 1 , and the recessed portion OB 2  is provided in the holder plate P 3 , such that the cavity AN will be formed at a position that corresponds to one of a plurality of corners of the electronic equipment  100  when the cushioning material S and the electronic equipment  100  are encased in the packing box  2 . 
     Therefore, the present embodiment makes it possible to reduce the risk of damage to the cushioning material S arising from pressure applied to the cushioning material S from the corner of the electronic equipment  100 , as compared with a structure in which the cavity AN is not provided in the cushioning material S. 
     Moreover, the present embodiment makes it possible to reduce the risk of damage, which could be caused by the positional displacement of the holder plate P 1  in the +Zs direction or the −Zs direction due to pressure applied to the holder plate P 1  from the electronic equipment  100  or the cushioning block R 1 , to the holder plate P 1  or the holder plate P 3  at the contact portion of the holder plate P 1  and the holder plate P 3 , as compared with a structure in which the cavity AN is not provided in the cushioning material S. Furthermore, the present embodiment makes it possible to reduce the risk of damage, which could be caused by the positional displacement of the holder plate P 3  in the +Xs direction or the −Xs direction due to pressure applied to the holder plate P 3  from the electronic equipment  100  or the cushioning block R 2 , to the holder plate P 1  or the holder plate P 3  at the contact portion of the holder plate P 1  and the holder plate P 3 , as compared with a structure in which the cavity AN is not provided in the cushioning material S. 
     B. MODIFICATION EXAMPLES 
     The exemplary embodiment described above can be modified in various ways. Some specific examples of modification are described below. Any two or more modification examples selected from among the examples described below may be combined as long as they are not contradictory to each other or one another. In each modification example described below, the same reference numerals as those used in the description and illustration of the foregoing embodiment will be assigned to elements that are equivalent to those in the foregoing embodiment in terms of operation and/or function, and a detailed explanation of them is omitted. 
     Modification Example 1 
     In the exemplary embodiment described above, the cushioning block R is fixed to the holder H by means of adhesive. However, the scope of the present disclosure is not limited to such an exemplary structure. The cushioning block R may be fixed to the holder H without using any adhesive. 
       FIG.  6    is an exploded perspective view illustrating an example of a structure of a cushioning material SA according to the present modification example. 
     The cushioning material SA is different from the cushioning material S according to the exemplary embodiment in that it includes a plurality of holders HA in place of the plurality of holders H and in that it includes a plurality of cushioning blocks RA in place of the plurality of cushioning blocks R. More specifically, the cushioning material SA is different from the cushioning material S according to the exemplary embodiment in that it includes three holders HA 1 , HA 2 , and HA 3  in place of the three holders H 1 , H 2 , and H 3  and in that it includes three cushioning blocks RA 1 , RA 2 , and RA 3  in place of the three cushioning blocks R 1 , R 2 , and R 3 . 
     The holder HA is different from the holder H according to the exemplary embodiment in that it includes two arrangement plates BB between two holder plates P of the holder HA. The arrangement plate BB has an opening HK for insertion of an end portion of the cushioning block RA. 
     One end of the cushioning block RA is inserted into the opening HK provided in one of the two arrangement plates BB disposed between the two holder plates P of the holder HA. The other end of the cushioning block RA is inserted into the opening HK provided in the other arrangement plate BB. By this means, the cushioning block RA is fixed between the two holder plates P of the holder HA due to a frictional force produced between the opening HK provided in the one of the two arrangement plates BB, which are disposed between the two holder plates P of the holder HA, and the one end of the cushioning block RA, and due to a frictional force produced between the opening HK provided in the other arrangement plate BB and the other end of the cushioning block RA. 
     For example, as illustrated in  FIG.  6   , the holder HA 1  includes an arrangement plate BB 1  continuous at one end to the holder plate P 1  and disposed between the holder plate P 1  and the holder plate P 2 , and an arrangement plate BB 2  continuous at one end to the holder plate P 2  and disposed between the holder plate P 1  and the holder plate P 2 , and more particularly, between the arrangement plate BB 1  and the holder plate P 2 . The arrangement plate BB 1  has an opening HK 1  for insertion of one end of the cushioning block RA 1 . The arrangement plate BB 2  has an opening HK 2  for insertion of the other end of the cushioning block RA 1 . The one end of the cushioning block RA 1  is inserted into the opening HK 1 . The other end of the cushioning block RA 1  is inserted into the opening HK 2 . By this means, the cushioning block RA 1  is fixed between the holder plate P 1  and the holder plate P 2  by the arrangement plate BB 1  and the arrangement plate BB 2 . 
     The cushioning block RA is comprised of a plurality of cushioning sheets SS “stacked” in a direction going from the one end toward the other end of the cushioning block RA. Therefore, arranging the cushioning block RA between the two holder plates P of the holder HA makes it possible to absorb external stress applied to the holder HA effectively between the two holder plates P of the holder HA. 
     For example, as illustrated in  FIG.  7   , the cushioning block RA 1  is comprised of a plurality of cushioning sheets SS stacked in the +Zs direction going from the holder plate P 1  toward the holder plate P 2 . Therefore, the holder HA 1  is able to absorb +Zs-directional external stress applied to the holder HA 1  and −Zs-directional external stress applied to the holder HA 1  effectively by means of the cushioning block RA 1 . 
     As explained above, in the present modification example, the cushioning block RA is mounted on the holder HA without using any adhesive. Therefore, the present modification example makes it possible to make the burden of detaching the cushioning block RA from the holder HA lighter when the cushioning material SA is taken apart, as compared with a structure in which the cushioning block RA is mounted on the holder HA by means of adhesive. Moreover, the present modification example realizes easy perfect removal of the cushioning block RA from the holder HA when the cushioning material SA is taken apart. Therefore, the present modification example makes it possible to make the recyclability of the cushioning material SA higher than that of the structure in which the cushioning block RA is mounted on the holder HA by means of adhesive. 
     In the cushioning material SA according to the present modification example, the cushioning block RA 1  includes the plurality of cushioning sheets SS stacked in the +Zs direction going from the holder plate P 1  toward the holder plate P 2 . 
     Therefore, the present modification example makes it possible to absorb +Zs-directional external stress applied to the holder plate P 1  or the holder plate P 2  and −Zs-directional external stress applied thereto more effectively, as compared with a structure in which the cushioning material SA does not include the cushioning block RA 1 . 
     In the cushioning material SA according to the present modification example, the holder HA 1  includes the arrangement plate BB 1  continuous at one end to the holder plate P 1  and disposed between the holder plate P 1  and the holder plate P 2 , and the arrangement plate BB 2  continuous at one end to the holder plate P 2  and disposed between the holder plate P 1  and the holder plate P 2 . In addition, one end of the cushioning block RA 1  is inserted into the opening HK 1  provided in the arrangement plate BB 1 , and the other end of the cushioning block RA 1  is inserted into the opening HK 2  provided in the arrangement plate BB 2 . 
     Therefore, the present modification example makes it possible to fix the cushioning block RA 1  between the holder plate P 1  and the holder plate P 2  of the holder HA 1  by utilizing a frictional force produced between the one end of the cushioning block RA 1  and the opening HK 1  and a frictional force produced between the other end of the cushioning block RA 1  and the opening HK 2 . 
     In the present modification example, the cushioning block RA is comprised of a plurality of cushioning sheets SS stacked in a direction going from one toward the other of two holder plates P between which this cushioning block RA is held. However, the scope of the present disclosure is not limited to such an exemplary structure. The cushioning block RA may be comprised of a plurality of cushioning sheets SS stacked in a direction intersecting with the direction going from one toward the other of two holder plates P between which this cushioning block RA is held. 
     Though the cushioning block RA is mounted on the holder HA by utilizing frictional forces without using any adhesive in the present modification example, the scope of the present disclosure is not limited to such an exemplary structure. For example, the cushioning block RA may be mounted on the holder HA more firmly by using adhesive in addition to frictional forces. 
     Modification Example 2 
     In the exemplary embodiment and the modification example 1 described above, a case where the plurality of holders H of the cushioning material S are made of a single flat plate-like member HH has been taken as an example. However, the scope of the present disclosure is not limited to such an exemplary structure. The cushioning material S may be comprised of a plurality of members. 
       FIG.  8    is an exploded perspective view illustrating an example of a structure of a cushioning material SB of a packing material according to the present modification example.  FIG.  9    is a perspective view illustrating an example of the structure of the cushioning material SB of the packing material according to the present modification example. 
     As illustrated in  FIG.  8   , in the present modification example, the cushioning material SB is comprised of three holders HB 1 , HB 2 , and HB 3 . In the present modification example, the holder HB 1  is coupled to the holder HB 2  and the holder HB 3 , the holder HB 2  is coupled to the holder HB 1  and the holder HB 3 , and the holder HB 3  is coupled to the holder HB 1  and the holder HB 2 . The holders HB 1 , HB 2 , and HB 3  may be hereinafter collectively referred to as “holder(s) HB”. 
     The holder HB 1  includes the holder plate P 1 , the holder plate P 2 , a junction protrusion member ST 1 , and a junction opening member SK 1 , and holds the cushioning block R 1 . In the description below, a structural part, of the holder HB 1 , for holding the cushioning block R 1  will be referred to as “holding portion BH 1 ”, and a structural part, of the holder HB 1 , for coupling the holder HB 1  to the holder HB 2  and the holder HB 3  will be referred to as “coupling portion BS 1 ”. 
     The holding portion BH 1  is a structural part, of the holder plate P 1  and the holder plate P 2 , extending in the +Xs direction. In the present modification example, one end of the cushioning block R 1  is bonded to the part, of the holder plate P 1 , corresponding to the holding portion BH 1  by means of adhesive, and the other end of the cushioning block R 1  is bonded to the part, of the holder plate P 2 , corresponding to the holding portion BH 1  by means of adhesive. 
     The coupling portion BS 1  includes a structural part, of the holder plate P 1  and the holder plate P 2 , extending in the +Ys direction, the junction protrusion member ST 1 , and the junction opening member SK 1 . The junction protrusion member ST 1  is a leaf-type member extending in the −Zs direction. One end of the junction protrusion member ST 1  is continuous to the holder plate P 2  at the +Ys-side edge of the holder plate P 2 , which is a part included in the coupling portion BS 1  of the holder plate P 2 . The junction opening member SK 1  is a leaf-type member having an opening and extending in the −Zs direction. One end of the junction opening member SK 1  is continuous to the holder plate P 2  at the +Xs-side edge of the holder plate P 2 , which is a part included in the coupling portion BS 1  of the holder plate P 2 . 
     In the present modification example, the holding portion BH 1  is an example of “a first holding portion”, the coupling portion BS 1  is an example of “a first coupling portion”, the +Zs direction is an example of “a first direction”, the +Xs direction is an example of “a second direction”, and the +Ys direction is an example of “a third direction”. 
     The holder HB 2  includes the holder plate P 3 , the holder plate P 4 , a junction protrusion member ST 2 , and a junction opening member SK 2 , and holds the cushioning block R 2 . In the description below, a structural part, of the holder HB 2 , for holding the cushioning block R 2  will be referred to as “holding portion BH 2 ”, and a structural part, of the holder HB 2 , for coupling the holder HB 2  to the holder HB 1  and the holder HB 3  will be referred to as “coupling portion BS 2 ”. 
     The holding portion BH 2  is a structural part, of the holder plate P 3  and the holder plate P 4 , extending in the +Ys direction. In the present modification example, one end of the cushioning block R 2  is bonded to the part, of the holder plate P 3 , corresponding to the holding portion BH 2  by means of adhesive, and the other end of the cushioning block R 2  is bonded to the part, of the holder plate P 4 , corresponding to the holding portion BH 2  by means of adhesive. 
     The coupling portion BS 2  includes a structural part, of the holder plate P 3  and the holder plate P 4 , extending in the +Zs direction, the junction protrusion member ST 2 , and the junction opening member SK 2 . The junction protrusion member ST 2  is a leaf-type member extending in the −Xs direction. One end of the junction protrusion member ST 2  is continuous to the holder plate P 4  at the +Zs-side edge of the holder plate P 4 , which is a part included in the coupling portion BS 2  of the holder plate P 4 . The junction opening member SK 2  is a leaf-type member having an opening and extending in the −Xs direction. One end of the junction opening member SK 2  is continuous to the holder plate P 4  at the +Ys-side edge of the holder plate P 4 , which is a part included in the coupling portion BS 2  of the holder plate P 4 . 
     In the present modification example, the holding portion BH 2  is an example of “a second holding portion”, and the coupling portion BS 2  is an example of “a second coupling portion”. 
     The holder HB 3  includes the holder plate P 5 , the holder plate P 6 , a junction protrusion member ST 3 , and a junction opening member SK 3 , and holds the cushioning block R 3 . In the description below, a structural part, of the holder HB 3 , for holding the cushioning block R 3  will be referred to as “holding portion BH 3 ”, and a structural part, of the holder HB 3 , for coupling the holder HB 3  to the holder HB 1  and the holder HB 2  will be referred to as “coupling portion BS 3 ”. 
     The holding portion BH 3  is a structural part, of the holder plate P 5  and the holder plate P 6 , extending in the +Zs direction. In the present modification example, one end of the cushioning block R 3  is bonded to the part, of the holder plate P 5 , corresponding to the holding portion BH 3  by means of adhesive, and the other end of the cushioning block R 3  is bonded to the part, of the holder plate P 6 , corresponding to the holding portion BH 3  by means of adhesive. 
     The coupling portion BS 3  includes a structural part, of the holder plate P 5  and the holder plate P 6 , extending in the +Xs direction, the junction protrusion member ST 3 , and the junction opening member SK 3 . The junction protrusion member ST 3  is a leaf-type member extending in the −Ys direction. One end of the junction protrusion member ST 3  is continuous to the holder plate P 6  at the +Xs-side edge of the holder plate P 6 , which is a part included in the coupling portion BS 3  of the holder plate P 6 . The junction opening member SK 3  is a leaf-type member having an opening and extending in the −Ys direction. One end of the junction opening member SK 3  is continuous to the holder plate P 6  at the +Zs-side edge of the holder plate P 6 , which is a part included in the coupling portion BS 3  of the holder plate P 6 . 
     In the present modification example, the holding portion BH 3  is an example of “a third holding portion”, and the coupling portion BS 3  is an example of “a third coupling portion”. 
     In the present modification example, the junction protrusion member ST 1  is inserted into the opening provided in the junction opening member SK 3 , the junction protrusion member ST 2  is inserted into the opening provided in the junction opening member SK 1 , and the junction protrusion member ST 3  is inserted into the opening provided in the junction opening member SK 2 , thereby coupling the holder HB 1 , the holder HB 2 , and the holder HB 3  to one another to form the cushioning material SB illustrated in  FIG.  9   . 
     In the present modification example, a case where the cushioning block R is bonded to the holding portion BH by means of adhesive has been taken as an example. However, the scope of the present disclosure is not limited to such an exemplary structure. For example, in the present modification example, as illustrated in  FIGS.  6  and  7   , the holding portion BH may include two arrangement plates BB each having an opening HK, and the cushioning block R may be held by the holding portion BH by insertion of its both ends into the two openings HK corresponding to the two arrangement plates BB. In this case, the cushioning block R may be fixed to the holding portion BH without using any adhesive. 
     As described above, the cushioning material SB according to the present modification example comprises the holder HB 1 , the cushioning block R 1 , the holder HB 2 , and the cushioning block R 2 . The holder HB 1  includes the holder plate P 1  and the holder plate P 2 . The holder plate P 1  is configured to face the electronic equipment  100  when the cushioning material SB and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 2  is configured to face an inner wall surface of the packing box  2  when the cushioning material SB and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 1  is provided between the holder plate P 1  and the holder plate P 2 . The holder HB 2  includes the holder plate P 3  and the holder plate P 4 . The holder plate P 3  is configured to face the electronic equipment  100  when the cushioning material SB and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 4  is configured to face an inner wall surface of the packing box  2  when the cushioning material SB and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 2  is provided between the holder plate P 3  and the holder plate P 4 . The holder HB 1  has the holding portion BH 1  and the coupling portion BS 1 . The holding portion BH 1  holds the cushioning block R 1  between the holder plate P 1  and the holder plate P 2  and extends in the +Xs direction. The coupling portion BS 1  extends in the +Ys direction. The holder HB 2  has the holding portion BH 2  and the coupling portion BS 2 . The holding portion BH 2  holds the cushioning block R 2  between the holder plate P 3  and the holder plate P 4 . The coupling portion BS 2  is coupled to the coupling portion BS 1 . The cushioning block R 2  extends in the +Xs direction. The holding portion BH 2  extends in the +Ys direction. The coupling portion BS 2  extends in the +Zs direction. 
     Therefore, the present modification example makes it possible to absorb external stress applied from the +Zs directional side and external stress applied from the +Xs directional side. 
     The cushioning material SB according to the present modification example further comprises the holder HB 3  and the cushioning block R 3 . The holder HB 3  includes the holder plate P 5  and the holder plate P 6 . The holder plate P 5  is configured to face the electronic equipment  100  when the cushioning material SB and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 6  is configured to face an inner wall surface of the packing box  2  when the cushioning material SB and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 3  is provided between the holder plate P 5  and the holder plate P 6 . The holder HB 3  has the holding portion BH 3  and the coupling portion BS 3 . The holding portion BH 3  holds the cushioning block R 3  between the holder plate P 5  and the holder plate P 6 . The coupling portion BS 3  is coupled to the coupling portion BS 1  and the coupling portion BS 2 . The cushioning block R 3  extends in the +Ys direction. The holding portion BH 3  extends in the +Zs direction. The coupling portion BS 3  extends in the +Xs direction. 
     Therefore, the present modification example makes it possible to absorb external stress applied from the +Zs directional side, external stress applied from the +Xs directional side, and external stress applied from the +Ys directional side. 
     Modification Example 3 
     In the exemplary embodiment and the modification examples 1 and 2 described above, a case where the packing material includes eight pieces of cushioning material has been taken as an example. However, the scope of the present disclosure is not limited to such an exemplary structure. For example, the number of pieces of cushioning material included in the packing material may be less than eight. 
       FIG.  10    is an exploded perspective view illustrating an example of a structure of a packing material  1 C according to the present modification example. 
     As illustrated in  FIG.  10   , the packing material  1 C according to the present modification example is different from the packing material  1  according to the exemplary embodiment in that it includes four pieces of cushioning material SC in place of the eight pieces of cushioning material S. Specifically, the packing material  1 C is different from the packing material  1  according to the exemplary embodiment in that it includes the four pieces of cushioning material SC- 1  to SC- 4  in place of the eight pieces of cushioning material S- 1  to S- 8 . 
     The cushioning material SC- 1  includes the cushioning material S- 1 , the cushioning material S- 2 , and a link material CN- 1  linking the cushioning material S- 1  and the cushioning material S- 2  to each other. The cushioning material SC- 2  includes the cushioning material S- 3 , the cushioning material S- 4 , and a link material CN- 2  linking the cushioning material S- 3  and the cushioning material S- 4  to each other. The cushioning material SC- 3  includes the cushioning material S- 5 , the cushioning material S- 6 , and a link material CN- 3  linking the cushioning material S- 5  and the cushioning material S- 6  to each other. The cushioning material SC- 4  includes the cushioning material S- 7 , the cushioning material S- 8 , and a link material CN- 4  linking the cushioning material S- 7  and the cushioning material S- 8  to each other. 
     The link material CN- 1 , CN- 2 , CN- 3 , and CN- 4  may be hereinafter collectively referred to as “link material CN”. The cushioning material S- 1 , S- 3 , S- 5 , and S- 7  may be hereinafter collectively referred to as “cushioning material S-P”. The cushioning material S- 2 , S- 4 , S- 6 , and S- 8  may be hereinafter collectively referred to as “cushioning material S-Q”. That is, in the present modification example, the cushioning material SC includes the cushioning material S-P, the cushioning material S-Q, and the link material CN linking the cushioning material S-P and the cushioning material S-Q to each other. In the present modification example, a case where the cushioning material SC is made of a single flat plate-like member HHC is taken as an example. 
       FIG.  11    is a plan view illustrating an example of a shape of a flat plate-like member HHC. 
     As illustrated in  FIG.  11   , the flat plate-like member HHC includes the flat plate-like member HH illustrated in  FIG.  3   , a flat plate-like member HHy, which has a shape obtained by inverting the flat plate-like member HH by mirror reversal in terms of the +Ys direction and the −Ys direction, and a linking flat plate-like member CNT 1 , which links the flat plate-like member HH and the flat plate-like member HHy to each other. The cushioning material SC is formed by folding the flat plate-like member HHC along dotted lines and dot-and-dash lines. 
     Specifically, the cushioning material S-P is formed by folding the flat plate-like member HH along dotted lines and a dot-and-dash line. The cushioning material S-Q is formed by folding the flat plate-like member HHy along dotted lines and a dot-and-dash line. The link material CN is formed by folding the linking flat plate-like member CNT 1  along dotted lines. In  FIG.  11   , each dotted line indicates a valley fold line, and each dot-and-dash line indicates a mountain fold line, similarly to  FIG.  3   . In  FIG.  11   , the following case is assumed as an example: a case where the cushioning material coordinate system ΣS is a coordinate system fixed to the holder plate P 2  of the cushioning material S-P and where the flat plate-like member HHC is obtained by developing (flattening) the cushioning material S-P, the cushioning material S-Q, and the link material CN in a state in which the cushioning material coordinate system ΣS is fixed to the holder plate P 2  of the cushioning material S-P. 
     In the description below, the holder H 1  of the cushioning material S-P will be referred to as “holder H 1 -P”, the holder H 2  of the cushioning material S-P will be referred to as “holder H 2 -P”, the holder plate P 1  of the holder H 1 -P will be referred to as “holder plate P 1 -P”, the holder plate P 2  of the holder H 1 -P will be referred to as “holder plate P 2 -P”, the holder plate P 3  of the holder H 2 -P will be referred to as “holder plate P 3 -P”, the holder plate P 4  of the holder H 2 -P will be referred to as “holder plate P 4 -P”, the cushioning block R 1  provided between the holder plate P 1 -P and the holder plate P 2 -P will be referred to as “cushioning block R 1 -P”, and the cushioning block R 2  provided between the holder plate P 3 -P and the holder plate P 4 -P will be referred to as “cushioning block R 2 -P”. In the description below, the holder H 1  of the cushioning material S-Q will be referred to as “holder H 1 -Q”, the holder H 2  of the cushioning material S-Q will be referred to as “holder H 2 -Q”, the holder plate P 1  of the holder H 1 -Q will be referred to as “holder plate P 1 -Q”, the holder plate P 2  of the holder H 1 -Q will be referred to as “holder plate P 2 -Q”, the holder plate P 3  of the holder H 2 -Q will be referred to as “holder plate P 3 -Q”, the holder plate P 4  of the holder H 2 -Q will be referred to as “holder plate P 4 -Q”, the cushioning block R 1  provided between the holder plate P 1 -Q and the holder plate P 2 -Q will be referred to as “cushioning block R 1 -Q”, and the cushioning block R 2  provided between the holder plate P 3 -Q and the holder plate P 4 -Q will be referred to as “cushioning block R 2 -Q”. 
     As described above, the cushioning material SC according to the present modification example is a cushioning material for being put into the packing box  2  configured for encasement of the electronic equipment  100 . The cushioning material is configured to absorb external stress applied to the electronic equipment  100  encased in the packing box  2 . The cushioning material comprises the holder H 1 -P, the cushioning block R 1 -P, the holder H 2 -P, the cushioning block R 2 -P, the holder H 1 -Q, the cushioning block R 1 -Q, the holder H 2 -Q, and the cushioning block R 2 -Q. The holder H 1 -P includes the holder plate P 1 -P and the holder plate P 2 -P. The holder plate P 1 -P is configured to face the electronic equipment  100  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 2 -P is configured to face an inner wall surface of the packing box  2  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 1 -P is provided between the holder plate P 1 -P and the holder plate P 2 -P. The holder H 2 -P includes the holder plate P 3 -P and the holder plate P 4 -P. The holder plate P 3 -P is configured to face the electronic equipment  100  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 4 -P is configured to face an inner wall surface of the packing box  2  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 2 -P is provided between the holder plate P 3 -P and the holder plate P 4 -P. The holder H 1 -Q includes the holder plate P 1 -Q and the holder plate P 2 -Q. The holder plate P 1 -Q is configured to face the electronic equipment  100  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 2 -Q is configured to face an inner wall surface of the packing box  2  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 1 -Q is provided between the holder plate P 1 -Q and the holder plate P 2 -Q. The holder H 2 -Q includes the holder plate P 3 -Q and the holder plate P 4 -Q. The holder plate P 3 -Q is configured to face the electronic equipment  100  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The holder plate P 4 -Q is configured to face an inner wall surface of the packing box  2  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The cushioning block R 2 -Q is provided between the holder plate P 3 -Q and the holder plate P 4 -Q. The cushioning block R 1 -P extends in the +Zs direction going from the holder plate P 1 -P toward the holder plate P 2 -P. The cushioning block R 2 -P extends in the +Xs direction going from the holder plate P 3 -P toward the holder plate P 4 -P. The cushioning block R 1 -Q extends in the +Zs direction going from the holder plate P 1 -Q toward the holder plate P 2 -Q The cushioning block R 2 -Q extends in the +Ys direction going from the holder plate P 3 -Q toward the holder plate P 4 -Q. The holder H 1 -P, the holder H 2 -P, the holder H 1 -Q, and the holder H 2 -Q are made of a single flat plate-like member HHC. The holder H 1 -P and the holder H 2 -P are disposed as holders of the cushioning material S-P at a position that corresponds to one of a plurality of corners of the electronic equipment  100  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . The holder H 1 -Q and the holder H 2 -Q are disposed as holders of the cushioning material S-Q at a position that corresponds to another one of the plurality of corners of the electronic equipment  100  when the cushioning material SC and the electronic equipment  100  are encased in the packing box  2 . 
     Therefore, the present modification example makes it possible to absorb external stress applied from the +Zs directional side, external stress applied from the +Xs directional side, and external stress applied from the +Ys directional side. Therefore, in the present modification example, as long as the packing material  1 C includes at least four pieces of the cushioning material SC, it is sufficient for absorbing external stress applied in every direction. Alternatively, in the present modification example, as long as the packing material  1 C includes at least two pieces of the cushioning material SC, it is sufficient for absorbing external stress applied from the −Zw-directional side. 
     In the present modification example, the holder H 1 -P is an example of “a first holder”, the holder H 2 -P is an example of “a second holder”, the holder H 1 -Q is an example of “a third holder”, the holder H 2 -Q is an example of “a fourth holder”, the holder plate P 1 -P is an example of “a first plate”, the holder plate P 2 -P is an example of “a second plate”, the holder plate P 3 -P is an example of “a third plate”, and the holder plate P 4 -P is an example of “a fourth plate”, the holder plate P 1 -Q is an example of “a fifth plate”, the holder plate P 2 -Q is an example of “a sixth plate”, the holder plate P 3 -Q is an example of “a seventh plate”, and the holder plate P 4 -Q is an example of “an eighth plate”. In the present modification example, the +Zs direction is an example of “a first direction”, the +Xs direction is an example of “a second direction”, the +Zs direction is an example of “a third direction”, the +Ys direction is an example of “a fourth direction”. 
     Modification Example 4 
     In the modification example 3 described above, among the plural pieces of cushioning material SC of the packing material  1 C, the cushioning material SC- 1  is made of a member that is different from a member of which the cushioning material SC- 2  is made. However, the scope of the present disclosure is not limited to such an exemplary structure. Among the plural pieces of cushioning material SC of the packing material  1 C, the cushioning material SC- 1  and the cushioning material SC- 2  may be made of a single flat plate-like member. Similarly, among the plural pieces of cushioning material SC of the packing material  1 C, the cushioning material SC- 3  and the cushioning material SC- 4  may be made of a single flat plate-like member. 
       FIG.  12    is an exploded perspective view illustrating an example of a structure of a packing material  1 D according to the present modification example. 
     As illustrated in  FIG.  12   , the packing material  1 D according to the present modification example is different from the packing material  1 C according to the modification example 3 in that it includes two pieces of cushioning material SD in place of the four pieces of cushioning material SC. Specifically, the packing material  1 D is different from the packing material  1 C according to the modification example 3 in that it includes the two pieces of cushioning material SD- 1  and SD- 2  in place of the four pieces of cushioning material SC- 1  to SC- 4 . 
     The cushioning material SD- 1 , one of the two, includes the cushioning material S- 1 , the cushioning material S- 2 , the cushioning material S- 3 , the cushioning material S- 4 , a link material CN- 12  linking the cushioning material S- 1  and the cushioning material S- 2  to each other, a link material CN- 23  linking the cushioning material S- 2  and the cushioning material S- 3  to each other, a link material CN- 34  linking the cushioning material S- 3  and the cushioning material S- 4  to each other, and a link material CN- 41  linking the cushioning material S- 4  and the cushioning material S- 1  to each other. The cushioning material SD- 2  includes the cushioning material S- 5 , the cushioning material S- 6 , the cushioning material S- 7 , the cushioning material S- 8 , a link material CN- 56  linking the cushioning material S- 5  and the cushioning material S- 6  to each other, a link material CN- 67  linking the cushioning material S- 6  and the cushioning material S- 7  to each other, a link material CN- 78  linking the cushioning material S- 7  and the cushioning material S- 8  to each other, and a link material CN- 85  linking the cushioning material S- 8  and the cushioning material S- 5  to each other. 
     The cushioning material S- 1  and S- 5  may be hereinafter collectively referred to as “cushioning material S-F 1 ”. The cushioning material S- 2  and S- 6  may be hereinafter collectively referred to as “cushioning material S-F 2 ”. The cushioning material S- 3  and S- 7  may be hereinafter collectively referred to as “cushioning material S-F 3 ”. The cushioning material S- 4  and S- 8  may be hereinafter collectively referred to as “cushioning material S-F 4 ”. The link material CN- 12  and CN- 56  may be hereinafter collectively referred to as “link material CN-F 12 ”. The link material CN- 23  and CN- 67  may be hereinafter collectively referred to as “link material CN-F 23 ”. The link material CN- 34  and CN- 78  may be hereinafter collectively referred to as “link material CN-F 34 ”. The link material CN- 41  and CN- 85  may be hereinafter collectively referred to as “link material CN-F 41 ”. 
     That is, in the present modification example, the cushioning material SD includes the cushioning material S-F 1 , the cushioning material S-F 2 , the cushioning material S-F 3 , the cushioning material S-F 4 , the link material CN-F 12  linking the cushioning material S-F 1  and the cushioning material S-F 2  to each other, the link material CN-F 23  linking the cushioning material S-F 2  and the cushioning material S-F 3  to each other, the link material CN-F 34  linking the cushioning material S- 3  and the cushioning material S- 4  to each other, and the link material CN-F 41  linking the cushioning material S-F 4  and the cushioning material S-F 1  to each other. In the present modification example, a case where the cushioning material SD is made of a single flat plate-like member HHD is taken as an example. 
       FIG.  13    is a plan view illustrating an example of a shape of a flat plate-like member HHD. 
     As illustrated in  FIG.  13   , the flat plate-like member HHD includes a flat plate-like member HH 1 , a flat plate-like member HH 2 , a flat plate-like member HH 3 , and a flat plate-like member HH 4 . Each of the flat plate-like member HH 1  and the flat plate-like member HH 3  has the same shape as that of the flat plate-like member HH illustrated in  FIG.  3   . Each of the flat plate-like member HH 2  and the flat plate-like member HH 4  has the same shape as that of the flat plate-like member HHy illustrated in  FIG.  11   . 
     The flat plate-like member HHD further includes a linking flat plate-like member CNT 12 , which links the flat plate-like member HH 1  and the flat plate-like member HH 2  to each other, a linking flat plate-like member CNT 23 , which links the flat plate-like member HH 2  and the flat plate-like member HH 3  to each other, a linking flat plate-like member CNT 41 , which links the flat plate-like member HH 4  and the flat plate-like member HH 1  to each other, a linking flat plate-like member CNT 341 , which is continuous to the flat plate-like member HH 3 , and a linking flat plate-like member CNT 342 , which links the linking flat plate-like member CNT 341  and the flat plate-like member HH 4  to each other. 
     The cushioning material SD is formed by folding the flat plate-like member HHD along dotted lines and dot-and-dash lines. 
     Specifically, the cushioning material S-F 1  is formed by folding the flat plate-like member HH 1  along dotted lines and a dot-and-dash line. The cushioning material S-F 2  is formed by folding the flat plate-like member HH 2  along dotted lines and a dot-and-dash line. The cushioning material S-F 3  is formed by folding the flat plate-like member HH 3  along dotted lines and a dot-and-dash line. The cushioning material S-F 4  is formed by folding the flat plate-like member HH 4  along dotted lines and a dot-and-dash line. The link material CN-F 12  is formed by folding the linking flat plate-like member CNT 12  along dotted lines. The link material CN-F 23  is formed by folding the linking flat plate-like member CNT 23  along dotted lines. The link material CN-F 41  is formed by folding the linking flat plate-like member CNT 41  along dotted lines. The link material CN-F 34  is formed by linking a member obtained by folding the linking flat plate-like member CNT 341  along a dotted line and a member obtained by folding the linking flat plate-like member CNT 342  along a dotted line together. In  FIG.  13   , each dotted line indicates a valley fold line, and each dot-and-dash line indicates a mountain fold line, similarly to  FIG.  3   . In  FIG.  13   , the following case is assumed as an example: a case where the cushioning material coordinate system ΣS is a coordinate system fixed to the holder plate P 2  of the cushioning material S-F 1  and where the flat plate-like member HHD is obtained by developing (flattening) the cushioning material S-F 1  to S-F 4 , the linking flat plate-like member CNT 12 , the linking flat plate-like member CNT 23 , the linking flat plate-like member CNT 41 , the linking flat plate-like member CNT 341 , and the linking flat plate-like member CNT 342  in a state in which the cushioning material coordinate system ΣS is fixed to the holder plate P 2  of the cushioning material S-F 1 . 
     Therefore, the present modification example makes it possible to absorb external stress applied from the +Zs directional side, external stress applied from the +Xs directional side, external stress applied from the −Xs directional side, external stress applied from the +Ys directional side, and external stress applied from the −Ys directional side by means of the cushioning material SD. Therefore, in the present modification example, as long as the packing material  1 D includes at least two pieces of the cushioning material SD, it is sufficient for absorbing external stress applied in every direction. Alternatively, in the present modification example, as long as the packing material  1 D includes at least one piece of the cushioning material SD, it is sufficient for absorbing external stress applied from the −Zw-directional side. 
     Modification Example 5 
     In the exemplary embodiment and the modification examples 1 to 4 described above, the Xw axis, the Yw axis, and the Zw axis of the packing box coordinate system ΣW are orthogonal to one another. However, the scope of the present disclosure is not limited to such an exemplary structure. It is sufficient as long as the Xw axis, the Yw axis, and the Zw axis of the packing box coordinate system ΣW extend in directions different from one another. 
     In the exemplary embodiment and the modification examples 1 to 4 described above, the Xs axis, the Ys axis, and the Zs axis of the cushioning material coordinate system ΣS are orthogonal to one another. However, the scope of the present disclosure is not limited to such an exemplary structure. It is sufficient as long as the Xs axis, the Ys axis, and the Zs axis of the cushioning material coordinate system ΣS extend in directions different from one another. 
     Modification Example 6 
     In the exemplary embodiment and the modification examples 1 to 5 described above, a case where the packing material includes twenty-four cushioning blocks has been taken as an example. However, the scope of the present disclosure is not limited to such an exemplary structure. For example, the packing material according to the present disclosure may include one or more, but not more than twenty-three, cushioning blocks. Alternatively, the packing material according to the present disclosure may include twenty-five or more cushioning blocks.