Patent Publication Number: US-10308390-B2

Title: Corrugated packaging box

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Korean Patent Application No. 10-2014-0162415, filed on Nov. 20, 2014, and the Korean Patent Application No. 10-2015-0028299, filed on Feb. 27, 2015, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference. 
     BACKGROUND 
     1. Field 
     Exemplary embodiments of the present disclosure relate to a packaging box for packaging an electronic product, and more particularly, a corrugated packaging box having a curved surface implemented thereof. 
     2. Description of the Related Art 
     In general, packaging boxes are in high demand and widely used. Some packaging boxes are manufactured from common paper, that is, pulp, since manufacturing costs often need to be low and handling and care often need to be easy. 
     However, when common paper, that is, the pulp, is used to manufacture packaging boxes, the common paper may need to be manufactured with at least a certain thickness for the sake of durability and impact resistance. As such, the weight of the packaging boxes may be increased. 
     To reduce the weight of the packaging boxes, however, packaging boxes may be manufactured using corrugated cardboard. 
     Corrugated packaging boxes are generally easy to manufacture, and the logistics cost (e.g., shipment and storage costs) may be reduced as corrugated packaging boxes may be assembled for use after being stored in an unfolded and stacked state. In addition, corrugated packaging boxes may be capable of storing a package safely while providing insulation capability and durability. 
     In some instances, corrugated packaging boxes intended to package a large electronic product such as a refrigerator, a washing machine, an air conditioner, a large-size TV, or a network server may be manufactured in the shape of a rectangular box or a cube, which may not reflect the shape of the product. 
     As such, when packaging a product having a curved surface into a rectangular box, a packaging space that is not necessary may be generated. 
     This extra packaging space of the packaging box may lead to difficulties such as damage to the product in the transporting process of the product. 
     SUMMARY 
     One or more exemplary embodiments provide a corrugated packaging box having a curved surface. 
     One or more exemplary embodiments also provide a corrugated packaging box formed of a corrugated cardboard having a corrugation direction corresponding to a horizontal direction of the corrugated packaging box. 
     One or more exemplary embodiments also provide a corrugated packaging box configured to communicate to a consumer, by use of the corrugated packaging box having a curved exterior appearance corresponding to a curved surface of a product, that the shape of the product is provided with a curved surface. 
     One or more exemplary embodiments also provide a corrugated packaging box capable of protecting a product having a curved surface when flaps, that is, upper panels and lower panels, of the corrugated packaging box, are closed. 
     One or more exemplary embodiments also provide a corrugated packaging box having the curved shape configured to be provided with a desired particular curvature. 
     In accordance with an aspect of exemplary embodiment, there is provided a packaging box formed of corrugated cardboard, wherein end portions of the packaging box are protruded relative to a middle portion of the packaging box so that the packaging box has a curved shape, and a corrugation direction of the corrugated cardboard is parallel to a longitudinal direction of the packaging box. 
     The packaging box may include at least one incision unit configured to prevent damage to a boundary of a portion of the packaging box when the packaging box is formed into the curved shape. 
     The at least one incision unit may be formed in the corrugation direction of the corrugated cardboard. 
     The packaging box may further include a plurality of panel units configured to be connected to one another, wherein the plurality of panel units includes: side panel units forming side panels of the packaging box; an upper panel unit formed at one side of the side panel unit so as to form an upper panel of the packaging box; a lower panel unit formed at the other side of the side panel unit so as to form a lower panel of the packaging box; and a connection unit formed on at least one of the side panel units and configured to be connected to another one of the side panel units. 
     The at least on incision unit may include a plurality of incision units provided between the side panel unit and the upper panel unit, and between the side panel unit and the lower panel unit. 
     The at least one incision unit may include a first incision unit formed in the corrugation direction of the corrugated cardboard, and second incision units formed extendedly and inclinedly from both end portions of the first incision unit. 
     Each of the upper panel unit and the lower panel unit may be divided into a plurality of panels. 
     The packaging box may further include a variation unit configured to vary a distance between the plurality of panels of the upper panel unit and a distance in between the plurality of panels of the lower panel unit when a curvature of the corrugated cardboard is deformed. 
     The variation unit may be configured to vary an angle between two adjacent panels of the plurality of panels of the upper panel unit. 
     The variation unit may be configured to vary an angle between two adjacent panels of the plurality of panels of the lower panel unit. 
     The packaging box may further include a first box configured to form an upper portion of the packaging box, and a second box detachably provided at a lower side of the first box, and a fixation unit configured to connect the first box and the second box. 
     The fixation unit may include: a first fixation hole formed in the first box, a second fixation hole formed in the second box, and a fixing member configured to penetrate the first fixation hole and the second fixation hole. 
     The packaging box may further include a cushion member configured to be disposed within the second box, wherein the cushion member has a curved shape, and the second box includes an assembly unit configured to connect the second box with the cushion member. 
     The plurality of panels of the upper panel unit and the plurality of panels of the lower panel unit may be configured to overlap one another when the curvature of the packaging box is deformed. 
     Each of the upper panel unit and the lower panel unit may include a creasing line and a cutting line that are configured to meet each other when foldedly deformed while having the creasing line as a center. 
     According to an aspect of another exemplary embodiment, there is provided a packaging box including a plurality of panel units formed of corrugated cardboard including a pair of cardboards and a corrugating medium providing corrugation in between the pair of cardboards, wherein the plurality of panel units are connected to each other and configured to be assembled by folding, a part of the plurality of panel units is deformed into a curved shape in which both end portions of the packaging box are protruded relative to a middle portion of the packaging box, and a corrugation direction of the corrugated medium is parallel to a longitudinal direction of the packaging box. 
     The packaging box may further include at least one incision unit formed in the corrugation direction of the corrugated cardboard. 
     The plurality of panel units of the corrugated cardboard may include: a side panel unit having a plurality of side panels configured to form side panels of the packaging box; an upper panel unit including a plurality of panels dividedly configured to form an upper panel of the packaging box; a lower panel unit including a plurality of panels dividedly configured to form a lower panel of the packaging box; and a connection unit formed on at least one of the side panels and configured to be connected to another one of the side panels. 
     The at least one incision unit may include a first incision unit formed in the corrugation direction of the corrugated cardboard, and second incision units formed extendedly and inclinedly from both end portions of the first incision unit. 
     The at least one incision unit may include a plurality of incision units provided between the side panel unit and the upper panel unit and between the side panel unit and the lower panel unit. 
     The packaging box may further include a variation unit configured to, when a curvature of the corrugated cardboard is deformed, vary a distance in between the plurality of panels of the upper panel unit and a distance in between the plurality of panels of the lower panel unit. 
     The variation unit may include a first variation unit configured to vary an angle in between two adjacent panels of the plurality of panels of the upper panel unit. 
     The variation unit may include a second variation unit configured to vary an angle in between two adjacent panels of the plurality of panels of the lower panel unit. 
     The packaging box may further include a first box configured to form an upper portion of the packaging box, a second box detachably provided at a lower side of the first box, and a fixation unit configured to detachably connect the first box to the second box. 
     The fixation unit may include a first fixation hole formed in the first box, a second fixation hole formed in the second box, and a fixing member configured to penetrate the first fixation hole and the second fixation hole. 
     The plurality of upper panels and the plurality of lower panels may be configured to overlap one another when a curved surface of the packaging box is deformed. 
     Each of the plurality of upper panels and the plurality of lower panels may include a creasing line and a cutting line that are configured to meet each other when foldedly deformed while having the creasing line as a center. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and/or other aspects will become apparent and more readily appreciated from the following description of exemplary embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a perspective view showing a corrugated packaging box according to an exemplary embodiment; 
         FIG. 2  is a drawing schematically showing a corrugated cardboard according to an exemplary embodiment; 
         FIG. 3  is a drawing showing a display apparatus having the shape of a curved surface being packaged in a corrugated packaging box according to an exemplary embodiment; 
         FIG. 4  is a development view of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 5  is a drawing showing a movement of a connection unit of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 6  is a drawing showing a movement of an upper panel unit at a time when a curvature state of a corrugated packaging box is deformed according to an exemplary embodiment; 
         FIG. 7  is an expanded view of portion A′ of  FIG. 6 . 
         FIG. 8  is a development view of a corrugated packaging box having a particular curvature according to an exemplary embodiment; 
         FIG. 9  is a development view showing a rear panel being disposed at a rear of a corrugated packaging box having a particular curvature according to an exemplary embodiment; 
         FIG. 10  is a development view showing a front panel being disposed at a front of a corrugated packaging box having a particular curvature according to an exemplary embodiment; 
         FIG. 11  is a development view of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 12  is a drawing showing a movement of a lower panel unit at a time when a curvature state of a corrugated packaging box is deformed according to an exemplary embodiment; 
         FIG. 13  is an expanded view of portion A″ of  FIG. 12 . 
         FIG. 14  is a drawing schematically showing a lower panel unit of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 15  is an exploded perspective view showing a display apparatus having a curved surface being packaged into a corrugated packaging box according to an exemplary embodiment; 
         FIG. 16  is a development view showing fixation units of a first box and a second box of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 17  is a development view of a second box of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 18  is an exploded perspective view schematically showing a second box and a cushion member of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 19  is a drawing showing a coupling unit of a second box and a cushion member provided for deformation of a curvature shape of a corrugated packaging box according to an exemplary embodiment; 
         FIG. 20  is a development view of a corrugated packaging box having a particular curvature according to an exemplary embodiment; and 
         FIG. 21  is a development view showing a front panel and a rear panel disposed at a rear of a corrugated packaging box having a particular curvature according to an exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the exemplary embodiments of with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout. The terminologies used hereinafter, such as “front end,” “rear end,” upper portion,” “lower portion,” “upper end,” and “lower end,” are defined by referring to the drawings, and the shape and position of each component is not limited by the terminologies as such. 
     The present disclosure may be applicable to all packaging boxes configured to package a product by means of storing as to transport or display. 
       FIGS. 1-7  are drawings illustrating a corrugated packaging box according to an exemplary embodiment. 
     As illustrated in  FIGS. 1-3 , a corrugated packaging box  1  is provided such that a product having a curve-shaped surface, such as a display apparatus, a toy, a computer, or other smart apparatus having the curve-shaped surface, may be accommodated therein. Hereinafter, the corrugated packaging box  1  provided to package a display apparatus  2  will be used as an example for descriptions. 
     The corrugated packaging box  1  may be formed such that the display apparatus  2  having the curve shaped surface may be accommodated therein. 
     Among other materials, the corrugated packaging box  1  may be formed of corrugated cardboard  4 . 
     The corrugated cardboard  4  includes a corrugating medium  4   d  provided such that a corrugation  4   c  is formed, and a pair of cardboards  4   a  and  4   b  are provided to be attached to both surfaces of the corrugating medium  4   d.    
     The pair of cardboards  4   a  and  4   b  includes a first cardboard  4   a  adhesively attached to one surface of the corrugating medium  4   d , and a second cardboard  4   b  adhesively attached to the other surface of the corrugating medium  4   d.    
     In addition, a coating layer may be applied to outer surfaces of the first cardboard  4   a  and the second cardboard  4   b  in certain cases. 
     In some embodiments, the thickness of the corrugated cardboard  4  is at least about 0.3 mm. 
     In addition, the corrugated cardboard  4  is manufactured such that a direction of corrugations  4   c  of the corrugating medium  4   d  provided in between the pair of cardboards  4   a  and  4   b , corresponds to a horizontal or longitudinal direction X of the corrugated packaging box  1 . 
     In addition, the corrugated cardboard  4  includes a plurality of panel units formed in the shape of a plane. 
     The plurality of panel units of the corrugated packaging box  1  is configured to be folded by use of a plurality of creasing lines  50 . In some embodiments, the direction of the corrugation  4   c  may be provided in an identical direction with respect to the horizontal direction X of the corrugated packaging box  1 . 
     The corrugated packaging box  1  may include an upper panel unit  20  forming an upper panel, a lower panel unit  30  forming a lower panel, and a side panel unit  10  forming side panels. 
     An accommodation space S may be provide within the corrugated packaging box  1 . The accommodation space S is formed by the lower panel unit  30  and the side panel unit  10 . The accommodation space S has a size and shape which corresponds to the size and shape of the display apparatus  2 , having the curve-shaped surface, such that the display apparatus may be accommodated therein. 
     The display apparatus  2 , having the curve shaped surface, is supported by use of a cushion member  3  provided at each of an upper end and a lower end of the display apparatus  2 , and is provided at the accommodation space S of the corrugated packaging box  1 . 
     The corrugated packaging box  1  is formed in a curved shape, as both end portions of the corrugated packaging box  1  are protruded relative to a middle portion of the corrugated cardboard  4 . 
     The plurality of panel units (the upper panel unit  20 , the side panel unit  10 , and the lower panel unit  30 ) of the corrugated cardboard  4  is folded by use of the creasing lines  50  to thereby form the corrugated packaging box  1  having the curved shape. 
       FIG. 4  is a development view of the corrugated packaging box according to an exemplary embodiment.  FIG. 5  is a drawing showing movement of a connection unit of the corrugated packaging box  1  according to an exemplary embodiment.  FIG. 6  is a drawing showing movement of the panel units  20 ,  30  at a time when the curvature state of the corrugated packaging box  1  is deformed according to an exemplary embodiment.  FIG. 7  is an expanded view of portion A′ of  FIG. 6 . 
     As illustrated in  FIGS. 4-7 , the side panel unit  10  of the corrugated packaging box  1  includes a first side panel  11 , a second side panel  12  configured to face the first side panel  11 , a third panel  13  disposed between the first side panel  11  and the second side panel  12 , and a fourth side panel  14  configured to face the third side panel  13 . 
     The first side panel  11  is configured to form a front panel of the corrugated packaging box  1 . The second side panel  12  is configured to form a rear panel while disposed and spaced apart by a predetermined distance at a rear of the first side panel  11 . 
     In the present embodiment, the horizontal length L 1  of the first side panel  11  is identical to the length of the horizontal length L 2  of the second side panel  12 . The horizontal length L 3  of the third side panel  13  is identical to horizontal length L 4  of the fourth side panel  14 . 
     Although in the present embodiment, the horizontal lengths of the first side panel  11  and the second side panel  12  forming the front panel and the rear panel of the corrugated packaging box  1  are illustrated to be identical, in other embodiments, the horizontal lengths of the first side panel  11  and the second side panel  12  may be different from one another. For example, the horizontal length of the first side panel  11  may be shorter than the horizontal length of the second side panel  12 . 
     The side panel unit  10  may be provided with a handle hole  15  formed therein so as to provide convenience to a user during moving or transporting of the corrugated packaging box  1 . 
     The handle hole  15  may be formed in each of the third side panel  13  and the fourth side panel  14 , so that a user may easily carry the corrugated packaging box  1  while holding the handle holes  15  formed in the sides of the third side panel  13  and the fourth side panel  14 . 
     In addition, a connection unit  40  configured to connect to the fourth side panel  14  is provided at the second side panel  12  of the side panel unit  10 . 
     The connection unit  40  is extends from one side of the second side panel  12 , and may be provided to make contact with an inner side of the fourth side panel  14  by use of the creasing lines  50 . 
     In some embodiments, the connection unit  40  is provided with an adhesive applied to an outer side surface thereof, and is configured to connect the second side panel  12  and the fourth side panel  14  when the connection unit  40  makes contact with an inner side of the fourth side panel  14 . 
     The connection unit  40  in the present embodiment is illustrated as extending from the second side panel  12 , but may extend from any other appropriate portion of the corrugated packaging box  1 . For example, the connection unit  40  may be disposed between the second side panel  12  and the third side panel  13 , the third side panel  13  and the first side panel  11 , or the first side panel  11  and the fourth side panel  14 . 
     An upper side and a lower side of the side panel unit  10  are provided with the upper panel unit  20  and the lower panel unit  30  connectively formed thereto, respectively. The creasing line  50  is provided in between the side panel unit  10  and the upper panel unit  20  and in between the side panel unit  10  and the lower panel unit  30  such that the corrugated cardboard  4  may be folded. 
     The upper panel unit  20 , disposed at an upper side of the side panel unit  10 , includes a first upper panel  21  formed at an upper side of the first side panel  11 , a second upper panel  22  formed at an upper side of the second side panel  12 , a third upper panel  23  formed at an upper side of the third side panel  13 , and a fourth upper panel  24  formed at an upper side of the fourth side panel  14 . 
     The first upper panel  21  and the second upper panel  22 , formed at the upper sides of the first side panel  11  and the second side panel  12  respectively, are divided so as to form a plurality of units or panels. 
     The lower panel unit  30  disposed at a lower side of the side panel unit  10 , includes a first lower panel  31  formed at a lower side of the first side panel  11 , a second lower panel  32  formed at a lower side of the second side panel  12 , a third lower panel  33  formed at a lower side of the third side panel  13 , and a fourth lower panel  34  formed at a lower side of the fourth side panel  14 . 
     The first lower panel  31  and the second lower panel  32 , formed at the lower sides of the first side panel  11  and the second side panel  12  respectively, are also divided so as to form a plurality of units or panels. 
     Panel units  21 ,  22 ,  31 ,  32  are divided so that creasing of the upper panel unit  20  and the lower panel unit  30  may be prevented when deforming the corrugated cardboard  4  into the state of a curved surface by moving both end portions of the first side panel  11  and the second side panel  12  toward the middle portion of the corrugated cardboard  4 . 
     In the present embodiment, in between the side panel unit  10  and the upper panel unit  20 , as well as in between the side panel unit  10  and the lower panel unit  30 , an incision unit  60  is provided to be formed such that damage, such as creasing or bursting, does not occur at the corrugated cardboard  4  when the corrugated cardboard  4  is deformed in the curved shape. 
     The incision unit  60  may be disposed along the creasing line  50  formed in between the side panel unit  10  and the upper panel unit  20 , as well as in between the side panel unit  10  and the lower panel unit  30 . 
     The incision unit  60  may be disposed at a connecting portion of a plurality of upper panels  21   a ,  21   b ,  21   c ,  21   d , and  21   e  of the first upper panel  21  and a plurality of upper panels  22   a ,  22   b ,  22   c ,  22   d , and  22   e , of the second upper panel  22  respectively, as the plurality of upper panels  21   a ,  21   b ,  21   c ,  21   d , and  21   e  and the plurality of upper panels  22   a ,  22   b ,  22   c ,  22   d , and  22   e  are provided to form the upper panel unit  20 . That is, the incision unit  60  may be formed in between a certain one of the upper panels, for example, the upper panel  21   a  of the first upper panel  21 , and another upper panel, for example, the upper panel  21   b , which is adjacent to the upper panel  21   a . The incision unit  60  may also be disposed at a connecting portion of a plurality of lower panels  31   a ,  31   b ,  31   c ,  31   d , and  31   e  of the first lower panel  31  and a plurality of lower panels  32   a ,  32   b ,  32   c ,  32   d , and  32   e , of the second lower panel  32  respectively, as the plurality of lower panels  31   a ,  31   b ,  31   c ,  31   d , and  31   e  and the plurality of lower panels  32   a ,  32   b ,  32   c ,  32   d , and  32   e  are provided to form the lower panel unit  30 . That is, the incision unit  60  may be formed in between a certain one of the lower panels, for example, the lower panel  31   a  of the first lower panel  31 , and another lower panel, for example, the lower panel  31   b , which is adjacent to the lower panel  31   a.    
     In some embodiments, the incision unit  60  is disposed at the creasing line  50 , which is in between the first side panel  11  and the in-between of the upper panel  21   a  and the adjacent upper panel  21   b  of the first upper panel  21 . 
     As best seen in  FIG. 7 , the incision unit  60  includes a first incision unit  61  formed in the direction of the corrugation  4   c  of the corrugated cardboard  4 , and a second incision unit  62  inclinedly and extendedly formed at both end portions of the first incision unit  61 . 
     The second incision unit  62  is formed such that damage, such as bursting or creasing of the corrugated cardboard  4 , does not occur when deforming the corrugated cardboard  4  in the curved shape. Although, the second incision unit  62  in the present embodiment is illustrated to be formed in a diagonal direction of the corrugated packaging box  1  toward an outer side direction of each first incision unit  61 , but is not limited hereto. The second incision unit  62  may be formed in a vertical direction Y of the corrugated packaging box  1 . 
     In addition, the upper panel unit  20  structured with the plurality of upper panels  21  and  22  includes a variation unit  70  provided to vary the distance in between the upper panels  21  and  22  when the corrugated cardboard  4  is deformed in the curved shape. 
     The variation unit  70  may be formed in between the plurality of upper panels  21  and  22 . The variation unit  70  is formed in between one upper panel of the plurality of upper panels  21  and  22 , and another upper panel of the plurality of upper panels  21  and  22  that is adjacent to the one upper panel. 
     For example, the variation unit  70  is formed in between a certain one upper panel, for example, the upper panel  22   a  of the second upper panel  22 , and another upper panel, for example, the upper panel  22   b  of the second upper panel  22 , which is adjacent to the upper panel  22   a . A variation angle θ 1 , which is varied according to the deformation of the curvature, may be formed in between one side end  71  of the one upper panel  22   a  and another side end  72  corresponding to the another upper panel  22   b . The variation angle θ 1  in between the one upper panel  22   a  and another upper panel  22   b  is decreased when the curvature state of the corrugated packaging box  1  is deformed. 
     In addition, the variation unit  70  is formed in between a certain one upper panel, for example, the upper panel  21   a  of the first upper panel  21 , and another upper panel, for example, the upper panel  21   b  of the first upper panel  21 , which is adjacent to the upper panel  21   a . The variation angle θ 1  formed in between one side end  73  of the one upper panel  21   a  and another side end  74  corresponding to the another upper panel  21   b  is increased at the time when the curvature state of the corrugated packaging box  1  is deformed. 
     The variation angle θ 1 , of the variation unit  70  formed in between the plurality of upper panels  21   a ,  21   b ,  21   c ,  21   d , and  21   e  of the first upper panel  21 , is increased at the time when the curvature state of the corrugated packaging box  1  is deformed, and the variation angle θ 1 , of the variation unit  70  formed in between the plurality of upper panels  22   a ,  22   b ,  22   c ,  22   d , and  22   e  of the second upper panel  22 , is decreased at the time when the curvature state of the corrugated packaging box  1  is deformed ( FIG. 6 ). 
     When deforming the curvature state of the corrugated packaging box  1 , both end portions of the first side panel  11  forming the front panel are moved forward, and the upper panels  21   a ,  21   b ,  21   d , and  21   e  are moved forward of the upper panel  21   c , which is disposed at a middle of the upper panels. The front of the first upper panel  21  is fixed while connected to the first side panel  11 , and thus the distance in between the respective upper panels  21   a ,  21   b ,  21   d , and  21   e  is widened. 
     In addition, when deforming the curvature state of the corrugated packaging box  1 , both end portions of the second side panel  12  forming the rear panel are moved forward, and the upper panels  22   a ,  22   b ,  22   d , and  22   e  are moved forward of the upper panel  22   c , which is disposed at a middle of the upper panels. The rear of the second upper panel  22  is fixed while connected to the second side panel  12 , and thus the distance in between the respective upper panels  22   a ,  22   b ,  22   d , and  22   e  is narrowed. 
     It should be appreciated that the lower panel  30  of the corrugated packaging box  1  may be identically applied as in the upper panel  20 . 
     Therefore, the corrugated packaging box  1 , using the corrugated cardboard  4 , is provided to form a side panel by connecting the connection unit  40  formed at one of the side panels  20 , to another one of the side panels  20 , and the curved shape may be formed by use of the variation units  70  of the lower panel  30  and the upper panel  20 . 
     The upper panel unit  20  may cover an upper portion of the corrugated packaging box  1  using the first panel  21 , as well as the second upper panel  22  which overlaps the first upper panel  21  or vice versa. Similarly, the lower panel  30  may cover a lower portion of the corrugated packaging box  1  using the first lower panel  31 , as well as the second lower panel  32  which overlaps the first lower panel  31  or vice versa. As such, the durability of the upper end panel and the lower end panel of the corrugated packaging box  1  may be enhanced. 
     In addition, by coinciding the horizontal direction X of the corrugated packaging box  1  and the direction of the corrugation  4   c  of the corrugated cardboard  4 , the strength of the horizontal direction X of the corrugated packaging box  1  may be enhanced. 
     The enhancement of the strength of the corrugated packaging box  1  as described above, may enable the corrugated packaging box  1  to be stacked and transported. 
     As illustrated from  FIG. 8  to  FIG. 10 , the corrugated packaging box according to an exemplary embodiment may be designed using a formula to provide the corrugated packaging box with a particular curvature such that a front panel FP and a rear panel RP are overlapped when the divided upper panels are folded. 
     The corrugated packaging box  1  may include a front panel FP, which is divided, and a rear panel RP, which is also divided, corresponding to the front panel FP. The front panel FP of the present embodiment is divided into five units, and includes a first front panel FP 1 , a second front panel FP 2 , a third front panel FP 3 , a fourth front panel FP 4 , and a fifth front panel FP 5 , and the rear panel RP of the present embodiment is also divided into five units, and includes a first rear panel RP 1 , a second rear panel RP 2 , a third rear panel RP 3 , a fourth rear panel RP 4 , and a fifth rear panel RP 5 , but the aspect of the present disclosure is not limited hereto. For example, the division of the front panel FP and the rear panel RP may be changed according to the size of the corrugated packaging box. 
     The divided upper panel of the corrugated packaging box  1  may include a cutting line L 1  and a creasing line L 2 . 
     The cutting line L 1  and the creasing line L 2  of the front panel FP and the rear panel RP may be disposed in opposite directions with respect to each other. 
     The width of the corrugated packaging box  1  is referred to as ‘a’ or ‘c’, the length of the rear panel of the rear panel RP is referred to as ‘a′’, the distance between flaps between the respective divided rear panels RP is referred to as ‘b’, the length of the flaps of the rear panel RP is referred to as ‘b′’, the length of the front panel FP is referred to as ‘c′’, and the length of flaps of the front panel FP is referred to as ‘d′’. 
     The angle of the rear panel RP is referred to as ‘θ’, which is an angle of the flaps of the rear panel RP, and the angle of the front panel FP is referred to as ‘φ’, which is an angle of the flaps of the front panel FP. 
     Assuming that the number of the divided front panel is referred to as ‘n’, which is the number of flaps, the height of the divided front panels is referred to as ‘h’, which is the height of the flap, and the distance between the front panel is referred to as ‘e’, which is the distance between the flaps, the above may be established as to satisfy the following Formula (1): 
     
       
         
           
             
               
                 
                   
                     
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     And, the divided front panel FP and the rear panel RP having the curvature formed by use of the figures that satisfy the above-described formula (1) may form a curved surface formed by use of the particular curvature, and at the same time, the front panel FP and the rear panel RP are completely overlapped. 
     As such, the corrugated packaging box  1  is formed such that the front panel FP and the rear panel RP are covered by one another while completely overlapping each other, thus making forming of the curved shape easier, and enhancing durability. 
       FIG. 11  is a development view of a corrugated packaging box according to another exemplary embodiment.  FIG. 12  is a drawing showing movement of the lower panel unit when the curvature state of the corrugated packaging box is deformed according the exemplary embodiment.  FIG. 13  is an expanded view of portion A″ of  FIG. 12 .  FIG. 14  is a drawing schematically showing the lower panel unit of the corrugated packaging box according to the exemplary embodiment. 
     As illustrated from  FIGS. 11-14 , a corrugated packaging box  1 A, having the curved shape, includes an upper panel unit  20 A forming an upper panel, a lower panel unit  30 A forming a lower panel, and a side panel unit  10 A forming side panels. 
     An accommodation space S may be provide within the corrugated packaging box  1 A. The accommodation space S is formed by the lower panel unit  30 A and the side panel unit  10 A. The accommodation space S has a size and shape which corresponds to the size and shape of the display apparatus  2 , having the curved-shaped surface, such that the display apparatus may be accommodated therein. 
     The corrugated packaging box  1 A is formed in the curved shape, formed as both end portions of the corrugated packaging box  1 A are moved toward a middle portion of the corrugated cardboard  4 . 
     The plurality of panel units (the upper panel unit  20 A, the side panel unit  10 A, and the lower panel unit  30 A) of the corrugated cardboard  4  is folded by use of the creasing lines  50  to thereby form the corrugated packaging box  1 A. 
     The side panel unit  10 A of the corrugated packaging box  1 A includes a first side panel  11 A, a second side panel  12 A configured to face the first side panel  11 A, a third panel  13 A disposed in between the first side panel  11 A and the second side panel  12 A, and a fourth side panel  14 A configured to face the third side panel  13 A. 
     In addition, a connection unit  40 A, configured to connect to the fourth side panel  14 A, extends from the second side panel  12 A of the side panel unit  10 A. The connection unit  40 A extends from one side of the second side panel  12 A, and is configured to make contact with an inner side of the fourth side panel  14 A. 
     An upper side and a lower side of the side panel unit  10 A are provided with the upper panel unit  20 A and the lower panel unit  30 A connectively formed thereto, respectively. The creasing line  50  is provided in between the side panel unit  10 A and the upper panel unit  20 A and in between the side panel unit  10 A and the lower panel unit  30 A such that the corrugated cardboard  4  may be folded. 
     The upper panel unit  20 A, disposed at an upper side of the side panel unit  10 A, includes a first upper panel  21 A formed at an upper side of the first side panel  11 A, a second upper panel  22 A formed at an upper side of the second side panel  12 A, a third upper panel  23 A formed at an upper side of the third side panel  13 A, and a fourth upper panel  24 A formed at an upper side of the fourth side panel  14 A. 
     The first upper panel  21 A and the second upper panel  22 A, formed at the upper sides of the first side panel  11 A and the second side panel  12 A respectively, are divided so as to formed a plurality of units. 
     The lower panel unit  30 A, disposed at a lower side of the side panel unit  10 A, includes a first lower panel  31 A formed at a lower side of the first side panel  11 A, a second lower panel  32 A formed at a lower side of the second side panel  12 A, a third lower panel  33 A formed at a lower side of the third side panel  13 A, and a fourth lower panel  34 A formed at a lower side of the fourth side panel  14 A. 
     The first lower panel  31 A and the second lower panel  32 A, formed at the lower sides of the first side panel  11 A and the second side panel  12 A respectively, are also divided so as to form a plurality of units. 
     Panels  21 A,  22 A,  31 A,  32 A are divided so that creasing of the upper panel unit  20 A and the lower panel unit  30 A may be prevented when deforming into the state of a curved surface by moving both end portions of the first side panel  11 A and the second side panel  12 A toward the middle portion of the corrugated cardboard  4 . 
     In between the side panel unit  10 A and the upper panel unit  20 A, as well as in between the side panel unit  10 A and the lower panel unit  30 A, incision units  60 A and  60 B and the variation unit  70  are provided to be formed such that creasing does not occur when the corrugated cardboard  4  is deformed in the curved shape. 
     The side panel unit  10 A, the upper panel unit  20 A, the incision units  60 A and  60 B, and the variation unit  70  of the corrugated packaging box  1 A according to the present embodiment may be identically applied as in the embodiments described above (e.g.,  FIGS. 4-7 ), and therefore the detailed descriptions of such will be omitted. 
     The lower panel unit  30 A includes a first lower panel  31 A formed at a lower side of the first side panel  11 A, a second lower panel  32 A formed at a lower side of the second side panel  12 A, a third lower panel  33 A formed at a lower side of the third side panel  13 A, and a fourth lower panel  34 A formed at a lower side of the fourth side panel  14 A. 
     The first lower panel  31 A and the second lower panel  32 A, formed at the lower sides of the first side panel  11 A and the second side panel  12 A respectively, are divided to form a plurality of units. Panels  31 A,  32 A are divided so that creasing of the corrugated cardboard  4  may be prevented when deforming into the state of a curved surface by moving both end portions of the first side panel  11 A and the second side panel  12 A toward the middle portion of the corrugated cardboard  4 . 
     The first lower panel  31 A and the second lower panel  32 A are formed to face each other, and may be formed in the shape to correspond with respect to each other. 
     The sum of the thicknesses of the first lower panel  31 A and the second lower panel  32 A may be identical to the thickness T of the corrugated packaging box  1 A. 
     For example, one of the lower panels of a plurality of first lower panels  31 Aa,  31 Ab,  31 Ac,  31 Ad, and  31 Ae of the first lower panel  31 A, for example, the lower panel  31 Aa, may have a first thickness ‘t 1 ’ at one end while the other end may have a second thickness ‘t 2 ’. In addition, one of the lower panels of a plurality of second lower panels  32 Aa,  32 Ab,  32 Ac,  32 Ad, and  32 Ae of the second lower panel  32 A, for example, the lower panel  32 Ae, may have a seventh thickness ‘t 7 ’ at one end while the other end may have an eighth thickness ‘t 8 ’. 
     The sum of the first thickness t 1  of the lower panel  31 Aa and the corresponding seventh thickness t 7  of the lower panel  32 Ae, or the sum of the second thickness t 2  and the eighth thickness t 8 , is identical to the thickness t of the corrugated packaging box  1 A. 
     Similarly, one end of another lower panel  31 Ab of the plurality of first lower panels  31 A may have a second thickness t 2  while the other end may have a third thickness t 3 . In addition, one end of the another lower panel  32 Ad of the plurality of second lower panels  32 A, may have a eighth thickness t 8  while the other end may have a ninth thickness t 9 . 
     The sum of the second thickness t 2  of the lower panel  31 Ab and the eighth thickness t 8  of the corresponding lower panel  32 Ad, or the sum of the second thickness t 3  and the ninth thickness t 9  is identical to the thickness t of the corrugated packaging box  1 A. 
     Therefore, each panel of the plurality of lower panels  31 Aa,  31 Ab,  31 Ac,  31 Ad, and  31 Ae of the first panel  31 A has a different thickness, and each panel of the plurality of lower panels  32 Aa,  32 Ab,  32 Ac,  32 Ad, and  32 Ae of the second lower panel  32 A has a different thickness. 
     Thus, the sum of the thickness of the plurality of lower panels  31 Aa,  31 Ab,  31 Ac,  31 Ad, and  31 Ae of the first panel  31 A and the corresponding thickness of the plurality of lower panels  32 Aa,  32 Ab,  32 Ac,  32 Ad, and  32 Ae of the second lower panel  32 A may be identical to the thickness t of the corrugated packaging box  1 A. 
     Therefore, the bottom panel of the corrugated packaging box  1 A is formed by use of the first lower panel  31 A, and the second lower panel  32 A corresponding to the first lower panel  31 A. 
     The incision unit  60 A may be disposed at the creasing line  50  in between the side panel unit  10 A and the upper panel unit  20 A. 
     In addition, the incision unit  60 A may include a deformation guiding unit  60 B disposed at the creasing line  50  in between the side panel unit  10 A and the lower panel unit  30 A. 
     The incision unit  60 A may be disposed at a connection portion of each of the plurality of first upper panels  21 A and the plurality of second upper panels  22 A forming the upper panel unit  20 A. That is, the incision unit  60 A may be disposed in between a certain one upper panel of the first upper panels  21 A, for example, the upper panel  21 Aa, and another upper panel of the first upper panels  21 A, for example, the upper panel  21 Ab, which is adjacent to the upper panel  21 Aa. 
     At this time, the incision unit  60 A includes a first incision unit  61 A formed at the creasing line  50  in between the first side panel  11 A and the first upper panel  21 A in the direction of the corrugation  4   c  of the corrugated cardboard  4 , and a second incision unit  62 A inclinedly and extendedly formed at both end portions of the first incision unit  61 A. 
     The second incision unit  62 A is formed such that bursting of the corrugated cardboard  4  does not occur at the time of deforming the corrugated cardboard  4  into the curved shape. 
     In addition, the upper panel unit  20 A, having the plurality of upper panels  21 A and  22 A, includes a variation unit  70 A provided to vary the distance in between the plurality of upper panels  21 A and  22 A when the corrugated cardboard  4  is deformed into the curved shape. 
     The variation unit  70 A may be formed in between the plurality of upper panels  22 A and the plurality of lower panels  32 A. For example, the variation unit  70 A may be formed in between a certain one upper panel, for example, the upper panel  22 Aa of the plurality of upper panels  22 A, and another upper panel, for example, the upper panel  22 Ab of the plurality of upper panels  22 A, which is adjacent to the upper panel  22 Aa, and in between a certain one lower panel, for example, the lower panel  32 Aa of the plurality of lower panels  32 A, and another lower panel, for example, the lower panel  32 Ab of the plurality of lower panels  32 A, which is adjacent to the lower panel  32 Aa. 
     The incision unit  60 A may be formed while disposed at an identical position at which the variation unit  70 A is formed. 
     The deformation guiding unit  60 B may be formed at the creasing line  50  in between the side panel unit  10 A and the lower panel unit  30 A. 
     The deformation guiding unit  60 B is provided such that bursting of the corrugated cardboard  4  does not occur when the corrugated cardboard  4  is deformed into the curved shape. The deformation guiding unit  60 B includes a first deformation guiding unit  61 B formed in a corrugation direction of the corrugated cardboard  4 , and a second deformation guiding unit  62 B inclinedly and extendedly formed at both end portions of the first deformation guiding unit  61 B. 
     The second deformation guiding unit  62 B is formed such that bursting of the corrugated cardboard  4  does not occur when the corrugated cardboard  4  is deformed into the curved shape. 
     The deformation guiding unit  60 B may be formed such that the deformation guiding unit  60 B is alternatively disposed with respect to the variation unit  70 A. 
     The deformation guiding unit  60 B is formed to coincided with the creasing line  50  formed in between the side panel unit  10 A and the plurality of lower panels  31 A and  32 A of the lower panel unit  30 A. 
     Meanwhile, the first lower panel  31 A of the lower panel unit  30 A and the second lower panel  32 A facing the first lower panel  31 A are provided such that the outer side of a central portion of the first lower panel  31 A and the second lower panel  32 A may be fixedly wrapped by use of a fixing member  80 A such as a tape. 
       FIG. 15  is a drawing showing a display apparatus having the curve-shaped surface being packaged in the corrugated packaging box according to another exemplary embodiment.  FIG. 16  is a drawing showing fixation units of a first box and a second box of the corrugated packaging box according to another exemplary embodiment.  FIG. 17  is a development view of a second box of a corrugated packaging box according to still another exemplary embodiment.  FIG. 18  is an exploded perspective view schematically showing a second box and a cushion member of a corrugated packaging box according to still another exemplary embodiment.  FIG. 19  is a drawing showing a coupling unit of the second box and the cushion unit provided for the deformation of the curvature shape of the corrugated packaging box according to still another exemplary embodiment. 
     As illustrated from  FIGS. 15-19 , a corrugated packaging box  100  having the curved shape according to still another exemplary embodiment includes a first box  110  provided to form an upper portion, and a second box  200  provided to form a lower portion. 
     The first box  110  includes a side panel unit  130  and an upper panel unit  120 . 
     The second box  200  includes a portion of a side panel and a lower panel of the corrugated packaging box  100 . 
     The first box  110  is configured to be detachably fixed with respect to the second box  200 . The first box  110  and the second box  200  may be connected by use of a fixation unit  140 . 
     The first box  110  and the second box  200  include a plurality of panel units. The plurality of panels of the corrugated cardboard  4  is provided to be folded by use of the creasing lines  50 . 
     The direction of the corrugation  4   c  of the corrugated cardboard  4  is provided to be formed in an identical direction with respect to the horizontal direction X of the corrugated packaging box  100 . 
     A variation unit  70  and an incision unit  60 A configured to form the curved shape by use of the side panel unit  130  and the upper panel unit  120  may be included. 
     A forming of the first box  110  in the curved shape by including the above-described structures is identical to the structures and the procedures of the above embodiments (e.g.,  FIGS. 4-14 ), and therefore the overlapping descriptions will be omitted. 
     A portion of the side panel unit  130  of the first box  110  may be provided with the fixation unit  140  configured to connect the first box  110  and the second box  200 . 
     The fixation unit  140  includes a first fixation hole  141  formed at the first box  110 , a second fixation hole  142  formed at the second box  200 , and a fixing member  143  provided to penetratively fix the first fixation hole  141  and the second fixation hole  142 . 
     The fixing member  143  may include a fixing bump  143   a  formed to be inserted into the second fixation hole  142 , and a supporting base  143   b  extending outwardly from the fixing bump  143   a.    
     The first fixation hole  141  may be provided in a plurality of units, and may be spaced apart with respect to each fixation hole  141 . 
     An inside of the second box  200  detachably connected to the first box  110  by use of the fixing member  143  is provided with an accommodation space S′ formed to correspond in size and shape such that the display apparatus  2 , having the curve-shaped surface, may be accommodated therein. 
     The accommodation space S′ is provided with a cushion member  3  configured to support the display apparatus  2 . 
     The cushion member  3  may be provided with a first cushion member  3   a  configured to support the upper panel unit of the display apparatus  2 , and a second cushion member  3   b  configured to support the lower panel unit of the display apparatus  2 . 
     Among other materials, the cushion member  3  may include Styrofoam material formed as to absorb vibration and impact that are generally occurred while transporting. The cushion member  3  may be formed in the curved shape by a method of an injection molding. 
     The second cushion member  3   b  is disposed inside the second box  200 , and the first cushion member  3   a  is disposed inside the first box  110 . 
     The second fixation hole  142  may be formed at a front panel unit  220  and a rear panel unit  230  of the second box  200 , both of which are to be described later. 
     The second box  200  may include a bottom unit  210  forming a bottom of the corrugated packaging box  100 , the front panel unit  220  forming a front panel, and the rear panel unit  230  forming a rear panel. 
     The second box  200  is provided with an open upper panel, and is formed in the curved shape while both end portions of the second box  200  are moved toward a middle portion of the corrugated cardboard  4 . 
     An accommodation space S′ may be provide within the second box  200 . The accommodation space S′ is formed by the bottom unit  210 , the front panel unit  220 , and the rear panel unit  230 . The accommodation space S′ has a size and shape which corresponds to the size and shape of the display apparatus  2 , having the curve-shaped surface, such that the display apparatus may be accommodated therein. 
     The accommodation space S′ is provided with a second cushion member  3   b  and the display apparatus  2  is supported by use of a second cushion member  3   b.    
     The second box  200  is formed by including a plurality of panel units, and the plurality of panel units is provided to form the curved shape while folded by use of the creasing lines  50 . 
     The second box  200  includes the bottom unit  210  structured with a single bottom panel  211  formed in the curved shape, the front panel unit  220  extendedly formed in a front of the bottom panel  211 , and the rear panel unit  230  extendedly formed toward a rear of the bottom panel  211 . 
     The front panel unit  220  and the rear panel unit  230  are divided so as to form a plurality of units. The front panel unit  220  includes the plurality of front panels  221 . The plurality of front panels  221  includes a first front panel  221   a , a second front panel  221   b  disposed near the first front panel  221   a , a third front panel  221   c  disposed near the second front panel  221   b , a fourth front panel  221   d  disposed near the third front panel  221   c , and a fifth front panel  221   e  disposed near the fourth front panel  221   d.    
     In addition, the rear panel unit  230  includes a plurality of rear panels  231 . The plurality of rear panels  231  includes a rear front panel  231   a , a second rear panel  231   b  disposed near the first rear panel  231   a , a third rear panel  231   c  disposed near the second rear panel  231   b , a fourth rear panel  231   d  disposed near the third rear panel  231   c , and a fifth rear panel  231   e  disposed near the fourth rear panel  231   d.    
     The incision unit  60 A and the variation unit  70  are provided in between from the first front panel  221   a  to the fifth front panel  221   e , as well as in between from the first rear panel  231   a  to the fifth rear panel  231   e.    
     The incision unit  60 A and the variation unit  70  may be provided in a plurality of units. 
     Meanwhile, a connection bump  241  is formed at the first front panel  221   a  and the fifth front panel  221   e , and a connection groove  242  corresponding to the connection bump  241  is formed at the first rear panel  231   a  and the fifth rear panel  231   e.    
     The connection bump  241  of the first front panel  221   a  is coupled to the connection groove  242  of the first rear panel  231   a , and the connection bump  241  of the fifth front panel  221   e  is coupled to the connection groove  232  of the fifth rear panel  231   e.    
     At least a portion of the first front panel  221   a  and the first rear panel  231   a  and at least a portion of the fifth front panel  221   e  and the fifth rear panel  231   e  are configured to connect the front panel unit  220  and the rear panel unit  230 . 
     Meanwhile, the second cushion member  3   b  provided as to correspond to the accommodation space S′ of the second box  200  may further include an assembly unit  250  provided as to detachably connect with respect to the second box  200 . 
     The second cushion member  3   b  is formed in the curved shape corresponding to the bottom panel  211  of the second box  200 . 
     The assembly unit  250 , by fixing the second box  200  at the second cushion member  3   b , is provided to solidify the curved shape of the second box  200 . 
     The assembly unit  250  includes an assembly groove  3   c  formed at an upper panel of the second cushion member  3   b , and an assembly bump  251  formed at each of the front panel unit  220  and the rear panel unit  230  of the second box  200  at a position corresponding to the assembly groove  3   c.    
     The assembly bump  251  in the present embodiment is formed at the end portion of each of the front panels from the second front panel  221   b  to the fourth front panel  221   d  of the front panel unit  220  and at the end portion of each of the rear panels from the rear panels from the second rear panel  231   b  to the fourth rear panel  231   d  of the rear panel unit  230 , and the assembly groove  3   c  corresponding to the assembly bump  251  is formed, six times, in an upper panel of the second cushion member  3   b  while spaced apart by a certain distance with respect to each other, but the aspect of the present disclosure is not limited hereto. For example, the assembly bump and the assembly groove may be deformed according to the size of the display apparatus. 
     Meanwhile, the assembly bump  251  formed in the curved shape at each of the front panel unit  220  and the rear panel unit  230  of the second box  200  is inserted toward the assembly groove  3   c  formed at the second cushion member  3   c  at an inside of the accommodation space S′, so as to hold the second box  200  in the curved shape. 
     With the second box  200  stably formed in the curved shape by use of the second cushion member  3   c , the second box  200  may be detachably coupled to the first box  110  through the fixing member  143 , and may easily package the display apparatus  2  having the curved-shape surface. 
       FIG. 20  and  FIG. 21  are development views of the corrugated packaging box having a particular curvature according to still another exemplary embodiment. 
     As illustrated on  FIG. 20  and  FIG. 21 , a corrugated packaging box according to an exemplary embodiment may include a formula having a particular curvature such that the front panel FP and the rear panel RP are provided to meet each other when the divided upper panels are folded. 
     The corrugated packaging box  1  may include a front panel FP′, which is divided, and a rear panel RP′ corresponding to the front panel FP′. The front panel FP′ of the present embodiment is divided into five units, and includes a first front panel FP′ 1 , a second front panel FP′ 2 , a third front panel FP′ 3 , a fourth front panel FP′ 4 , and a fifth front panel FP′ 5 , and the rear panel RP′ is also divided into five units, and includes a first rear panel RP′ 1 , a second rear panel RP′ 2 , a third rear panel RP′ 3 , a fourth rear panel RP′ 4 , and a fifth rear panel RP′ 5 , but the aspect of the present disclosure is not limited hereto. For example, the division of the front panel and the rear panel may be changed according to the size of the corrugated packaging box. 
     Meanwhile, the width of the corrugated packaging box  1  is referred to as a, the length of the front panel FP and the rear panel RP is referred to as a′, the distance between flaps between the respective divided rear panels RP is referred to as b or c, the length of the flaps of the rear panel RP is referred to as b′ or c′, the distance between flaps between the respective divided front panels FP is referred to as e, and the length of flaps of the front panel FP is referred to as e′. 
     The angle of the rear panel RP is referred to as θ, which is an angle of the flaps of the rear panel, and the angle of the front panel FP is referred to as Φ, which is an angle of the flaps of the front panel FP. 
     The number of the divided front panel is referred to as n, which is the number of flaps, the height of the divided front panels is referred to as ‘h’, which is the height of the flap, and the angle between the front panel is referred to as e, which is the distance between the flaps. 
     In addition, assuming that the minimum depth of the corrugated packaging box  1  is referred to as d_min (minimum depth of box) and the maximum depth of the corrugated packaging box  1  is referred to as d_max (maximum depth of box), the above may be established as to satisfy the following Formula (2): 
     
       
         
           
             
               
                 
                   
                     
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                               - 
                               
                                 
                                   ( 
                                   
                                     e 
                                     2 
                                   
                                   ) 
                                 
                                 2 
                               
                             
                           
                           R 
                         
                         ) 
                       
                     
                     , 
                     
                        
                     
                     ⁢ 
                     
                       F 
                       = 
                       
                         
                           cos 
                           
                             - 
                             1 
                           
                         
                         ( 
                         
                           
                             
                               
                                 R 
                                 2 
                               
                               - 
                               
                                 
                                   ( 
                                   
                                     f 
                                     2 
                                   
                                   ) 
                                 
                                 2 
                               
                             
                           
                           R 
                         
                         ) 
                       
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     Φ 
                     = 
                     
                       
                         π 
                         - 
                         
                           ( 
                           
                             Z 
                             + 
                             A 
                           
                           ) 
                         
                       
                       = 
                       
                         
                           π 
                           - 
                           
                             [ 
                             
                               
                                 
                                   π 
                                   - 
                                   
                                     ( 
                                     
                                       A 
                                       - 
                                       E 
                                     
                                     ) 
                                   
                                 
                                 2 
                               
                               + 
                               A 
                             
                             ] 
                           
                         
                         = 
                         
                           
                             π 
                             - 
                             
                               ( 
                               
                                 A 
                                 + 
                                 E 
                               
                               ) 
                             
                           
                           2 
                         
                       
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     
                       Φ 
                       ′ 
                     
                     = 
                     
                       
                         π 
                         - 
                         
                           ( 
                           
                             W 
                             + 
                             E 
                           
                           ) 
                         
                       
                       = 
                       
                         
                           π 
                           - 
                           
                             [ 
                             
                               
                                 
                                   π 
                                   - 
                                   
                                     ( 
                                     
                                       E 
                                       - 
                                       F 
                                     
                                     ) 
                                   
                                 
                                 2 
                               
                               + 
                               E 
                             
                             ] 
                           
                         
                         = 
                         
                           
                             π 
                             - 
                             
                               ( 
                               
                                 E 
                                 + 
                                 F 
                               
                               ) 
                             
                           
                           2 
                         
                       
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     
                       a 
                       ′ 
                     
                     = 
                     
                       f 
                       × 
                       2 
                       ⁢ 
                       A 
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     
                       b 
                       ′ 
                     
                     = 
                     
                       b 
                       × 
                       2 
                       ⁢ 
                       B 
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     
                       c 
                       ′ 
                     
                     = 
                     
                       c 
                       × 
                       2 
                       ⁢ 
                       C 
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     
                       e 
                       ′ 
                     
                     = 
                     
                       e 
                       × 
                       2 
                       ⁢ 
                       E 
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     
                       f 
                       ′ 
                     
                     = 
                     
                       f 
                       × 
                       2 
                       ⁢ 
                       F 
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     g 
                     = 
                     
                       
                         d 
                         min 
                       
                       - 
                       
                         
                           d 
                           max 
                         
                         2 
                       
                     
                   
                   ⁢ 
                   
                     
 
                   
                   ⁢ 
                   
                     
                       d 
                       max 
                     
                     = 
                     
                       
                         d 
                         min 
                       
                       + 
                       
                         r 
                         ⁡ 
                         
                           ( 
                           
                             1 
                             - 
                             
                               cos 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               A 
                             
                           
                           ) 
                         
                       
                     
                   
                 
               
               
                 
                   [ 
                   
                     Formula 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     
                       ( 
                       2 
                       ) 
                     
                   
                   ] 
                 
               
             
           
         
       
     
     The divided front panel FP and the rear panel RP having the curvature formed by use of the figures that satisfy the above-described Formula (2) are provided such that the cutting lines L 1  may meet each other when divided front panel 
     The front panel FP and the rear panel RP are folded while having the creasing lines L 2  as references. Therefore, at the same time when a curved surface formed by use of the particular curvature, the front panel FP and the rear panel RP are provided to correspondingly meet each other. 
     Therefore, the corrugated packaging box  1  is provided to form the shape of a packaging box while maintaining the curved shape as the front panel FP and the rear panel RP are provided to correspondingly meet each other. 
     As should be apparent from the disclosure above, as a corrugation direction of a corrugated cardboard is provided to be parallel to the horizontal direction of a corrugated packaging box, the strength of the corrugated packaging box may be enhanced. 
     In addition, by including a curved surface corresponding to a curved shape of an electronic product, such as a display apparatus, a toy, a computer, or other smart apparatus, the shape of the product may be acknowledged and reflected in the corrugated packaging box such that the corrugated packaging box conforms to the curved shape of the electronic product. 
     In addition, the packaging space may be minimized as the corrugated box packaging conforms to the shape of a product. 
     In addition, protection of the electronic product may be provided when the flaps are covered by implementing a corrugated packaging box having the curved shape of a particular curvature of the electronic product. 
     Although a few exemplary embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.