JP5155039B2 - Packaging box - Google Patents

Description

  The present invention relates to a packaging box.

  The packaging box includes a pair of end walls and side walls that face each other, and an inner flap is connected to each end wall, and an outer flap is connected to each side wall. And the opening end of the outer peripheral wall surrounded by the side wall and the end wall is obtained by folding the inner flap and then folding the outer flap and sticking these overlapping portions with an adhesive (hot melt) made of a hot-melt resin. Sealed.

  When opening the packaging box, in the outer flaps that face each other, a hand is inserted into the center where the inner flap does not exist on the inner surface side, and one outer flap is pulled up. Thereby, an outer flap is made to peel with respect to an inner flap. However, the operation of inserting a hand between the outer flaps that are in contact with each other causes discomfort to the operator because the hand rubs against the leading edge of the outer flap.

  This invention is for improving the opening workability | operativity of such a packaging box, and there exists the following as related prior art literature information.

JP 2002-326624 A JP 2003-335323 A JP 2008-222242 A

  The packaging box of Patent Document 1 is provided with a wavy uneven portion in which a semicircular concave portion and a convex portion are alternately arranged at the leading edge of the outer flaps that face each other. Thereby, while improving the workability | operativity which inserts the finger of a hand in the clearance gap between outer flaps at the time of opening, it is comprised so that it may become difficult to cut | disconnect an operator's fingertip.

  The packaging box of Patent Document 2 is provided with a pair of slanted fold rules that extend in a V shape toward the leading edge at the center of the outer flap, and a middle folding rule that is orthogonal to the leading edge at the center. And a pair of flexible portions are provided on both sides of the folded ruled line. Thereby, at the time of opening, by pushing the flexible part of one outer flap inward, the front-end edge of the other outer flap is exposed, and the hand insertion workability is improved.

  However, these packaging boxes of Patent Documents 1 and 2 can improve hand insertion workability between the front edges of the outer flap, but a very strong force is required when peeling the outer flap from the inner flap. Therefore, opening is very difficult for a worker with weak force.

  Therefore, in order to solve the problem of this type of packaging box, the present applicant has proposed a packaging box that can be opened with a small force without impairing the closing strength in the sealed state. Specifically, the packaging box of Patent Document 3 is configured to have a folding assist folding curve and a bending assist folding curve so as to form a substantially W shape with respect to the outer flap. Among them, the folding assist folding curves located on both outer sides are formed so as to incline so as to spread outward from the boundary line with the continuous side wall toward the leading edge of the outer flap. And the front-end | tip position of the outer flap in one 1st opening assistance folding curve is comprised so that it may be located in the center side rather than the front-end | tip position in the other 2nd opening folding curve. As a result, the component force of the force acting when gripping and pulling up the center of the front end of the outer flap is made non-uniform, and after one sticking is released, the other sticking is released doing.

  However, the packaging box of Patent Document 3 has a small width in the end wall and a protruding dimension of the outer flap, and the inner side of the corrugated cardboard paper that forms the packaging box with respect to the outer flap crosses the protruding direction. It is a wrap-around type configured to extend. Therefore, it is difficult to obtain the same effect in a general-purpose packaging box having a large end wall width and a large projecting dimension of the outer flap.

  That is, the general-purpose packaging boxes are stacked so that the surfaces closed by the flaps are positioned above and below, so that the middle shin extends in the flap protruding direction in consideration of pressure resistance. Therefore, when a long opening assist folding curve corresponding to the protrusion amount of the outer flap is provided, it cannot be bent only along the folding curve, and it is not intended along the middle shin (step) during the opening operation. Since a deformation line is generated, there is a problem that a similar action cannot be obtained. Moreover, since the amount of protrusion of the flap is large, there is a problem that when the folding assist folding curve is positioned at the leading edge of the outer flap, the inclination angle becomes small and the same action cannot be obtained.

  The present invention has been made in view of conventional problems, and it is an object of the present invention to provide a packaging box that can be easily opened with a small force regardless of the protruding size of the outer flap and the step direction of the center of the corrugated cardboard paper. It is what.

  In order to solve the above-described problems, the packaging box of the present invention includes a pair of end walls and side walls that face each other, and an inner flap is connected to at least one end of each end wall, and an inner flap is provided on each side wall. In the packaging box which is sealed by sticking the overlapped portions of these flaps, the outer flaps which overlap with the outer surface of each other and are connected to each other, and are attached to the at least one outer flap along the leading edge. An opening assisting portion having an extending slit and a pair of opening assist folding curves extending from substantially both ends of the slit toward the leading edge of the outer flap is provided so as to extend outwardly, and the opening assisting portion is connected to the outer flap. Is formed asymmetrically with reference to a center line extending in the same direction as the protruding direction.

  Specifically, this packaging box is made of corrugated paper in which a corrugated shin is provided between the cover and the back paper, and the shin is configured to extend along the protruding direction of the outer flap. ing.

  The packaging box is opened so that a finger is inserted into the front edge of the outer flap and the slit, and a portion between the ends is gripped and pulled up. Alternatively, a finger is inserted into the front edge of the outer flap, and the opening operation is performed so as to raise the front edge. Alternatively, a finger is inserted into the slit, and the opening operation is performed so as to raise the tip edge side.

  At this time, the opening assisting portion surrounded by the opening assist folding curve and the slit is raised. Further, in the present invention, since the opening assist folding curves are provided on both sides of the slit provided in the outer flap, a folding line designed in advance at the time of opening can be formed regardless of the protruding dimension of the outer flap. Then, when the opening operation is performed in this state, since the opening assisting portion is formed asymmetrically with respect to the center line of the outer flap, the force acting on the pair of attachment regions located on both sides can be biased. . As a result, after the adhesive region on the side where the force acts strongly is first peeled off, the remaining sticking regions can be peeled off later. Therefore, it can be easily opened with a small force as compared with a case where an equal force is applied to the pair of sticking regions to separate.

  In this packaging box, the opening assisting portion is formed asymmetrically by providing the slit so as to be positioned at the center in the width direction of the outer flap and by forming the opening assist folding curves to have different inclination angles. ing. If it does in this way, the front-end | tip position located on the front-end edge of an outer flap can be made to peel from the sticking area | region of the side which provided the folding curve for opening assistance close | similar to the centerline of an outer flap.

  Or the said opening assistance part is formed asymmetrically by providing the said slit in the position biased laterally from the width direction center of the said outer flap. If it does in this way, it can be made to peel from the pasting field where the distance to the edge of a slit is near.

In addition, it is preferable to provide a pair of grip assist folding curves extending outwardly from the intermediate position of the slit toward the continuous side wall.
Moreover, it is preferable to provide a pair of folding assist folding curves extending from substantially both ends of the slit toward the continuous side wall.
In this way, the workability of inserting a finger into the slit can be improved.

  In the packaging box of the present invention, since the folding assist folding curves are provided on both sides of the slit provided in the outer flap, a fold line designed in advance at the time of opening can be formed regardless of the projecting dimension of the outer flap. And when opening operation | work, since it forms asymmetrically on the basis of the centerline of the outer flap of an opening assistance part, the force which acts on a pair of sticking area | region located in both sides can be biased. As a result, after the adhesive region on the side where the force acts strongly is first peeled off, the remaining sticking regions can be peeled off later. Therefore, it can be easily opened with a small force as compared with a case where an equal force is applied to the pair of sticking regions to separate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 7 show a packaging box according to a first embodiment of the present invention. As shown in FIG. 3, the packaging box includes a pair of end walls 10A and 10B and side walls 11A and 11B that face each other, and flaps 14A and 14B to 17A that respectively form lid walls on the upper and lower end edges thereof. In the case where 17B is continuously provided, each of the outer flaps 16A, 16B, 17A, and 17B is provided with an opening assisting portion 19 so that the opening operation can be easily performed with a small force.

  In this packaging box, a corrugated cardboard paper 1 in which a corrugated shin 4 is disposed between a cover 2 and a back paper 3 shown in FIG. 2 (A) is formed in FIG. 1 by a known paper container punching device (not shown). The blank is punched as a continuous blank to be shown, and a predetermined portion is pasted by gluing.

  As shown in FIG. 1, the packaging box blank is provided such that rectangular end walls 10A and 10B and side walls 11A and 11B are alternately and linearly continuous in the lateral direction. Specifically, the first side wall 11A, the first end wall 10A, the second side wall 11B, and the second end wall 10B are connected in order from the left end to the right end. Among these, the margin part 12 for adhering to the end wall 10B located in the right end part is connected to the side edge of the side wall 11A located in the left end part. And the 1st folding line 13 formed in the part located in each boundary line of these end walls 10A and 10B, side wall 11A, 11B, and the glue margin part 12 so that the thickness may be compressed is provided. ing. As shown in FIG. 2 (B), the first folding curve 13 is formed by curving the backing paper 3 inward by making a ruled line from the backing paper 3 side with respect to the corrugated cardboard 1. It is.

  Upper end inner flaps 14A and 14B are connected to upper end edges of the end walls 10A and 10B, and lower inner flaps 15A and 15B are connected to lower end edges of the end walls 10A and 10B. The side walls 11A and 11B are provided with upper outer flaps 16A and 16B connected to upper end edges thereof, and lower outer flaps 17A and 17B connected to lower end edges of the side walls 11A and 11B, respectively. And the 2nd folding line 18 similar to the above is provided in the part located in the boundary line of each of these flap 14A, 14B-17A, 17B and each continuous wall 10A, 10B, 11A, 11B. . Although the flaps 14A, 14B, 16A, and 16B are formally defined as the upper side and the flaps 15A, 15B, 17A, and 17B are defined as the lower side, there is no upper and lower limit in actual use.

  Here, this blank is punched out so that the central shin 4 constituting the corrugated paper 1 extends in parallel along the protruding direction of the flaps 14A, 14B to 17A, 17B. In addition, the second folding line 18 is configured to extend linearly in the lateral direction, and is configured such that the leading edges of the flaps 14A, 14B to 17A, 17B are linearly positioned. Thereby, it is comprised so that it can be formed with the flexogluer which is a general purpose machine among well-known paper container punching apparatuses.

  And in this embodiment, the opening assistance part 19 is provided in each outer flap 16A, 16B, 17A, 17B. The opening assisting portion 19 includes a slit 20 that extends along the front edge of the outer flaps 16A, 16B, 17A, and 17B, and a pair of opening assist folding curves 21A and 21B that extend from both ends of the slit 20. Further, in order to enable easy gripping of the outer flaps 16A, 16B, 17A, and 17B at the beginning of the opening operation, grip assist assist folding lines 22A, 22B, 23A, and 23B are further provided.

  The slit 20 is divided into a distal end side of the outer flaps 16A, 16B, 17A, and 17B and a proximal end side that is continuous with the side walls 11A and 11B. The slit 20 is formed so as to extend along the tip edge at the center in the width direction of the outer flaps 16A, 16B, 17A, 17B. As shown in FIG. 2C, the slit 20 is formed by cutting from the cover sheet 2 to the backing sheet 3 with a cutting blade. In addition, the slit 20 has a full length into which the operator's (human body) hand can be inserted, and a side wall on the opposite side to the leading edge so as not to give pain to the operator's finger when the opening assisting portion 19 is gripped. It is formed in an arc shape centering on the sides of 11A and 11B. Further, arc-shaped curved portions 20a that are curved toward the side walls 11A and 11B are provided at both ends of the slit 20 in order to prevent breakage during deformation.

  The folding assist folding lines 21A and 21B are provided so as to extend so as to extend outwardly from substantially both ends of the slit 20 toward the leading edges of the outer flaps 16A, 16B, 17A, and 17B. As shown in FIG. 2 (D), these opening assist folding curves 21A and 21B are so-called reverse ruled folding curves 21a formed so as to compress the thickness from the cover 2 side of the cardboard paper 1. And lead ruled lines including discontinuous cutting lines 21b provided at predetermined intervals along the folding line 21a.

  Among them, one first opening assist folding curve 21A provided so as to extend from the left side of the slit 20 toward the front edge of the outer flaps 16A, 16B, 17A, 17B is the outer flap 16A, which is the front end position P1. The distance between the intersections of the tip edges of 16B, 17A, and 17B and the center line L1 is set to the dimension S1. The other second unfolding assist folding curve 21B has a distance S2 between the intersection of the outer flaps 16A, 16B, 17A, and 17B, which is the distal end position P2, and the center line L1. Is set. The dimensions S1 and S2 of the tip positions P1 and P2 are configured to satisfy S1 <S2. Here, the center line L1 is a virtual line extending in the same direction as the protruding direction from the center in the width (lateral) direction of the outer flaps 16A, 16B, 17A, and 17B.

  Thus, the tip position P1 of the first opening assist folding curve 21A is located closer to the center side at the tip edge of the outer flaps 16A, 16B, 17A, 17B than the tip position P2 of the second opening assist folding curve 21B. To do. Further, the inclination angles (angles formed with the leading edge) α and β of the opening assist folding curves 21A and 21B are different (α> β), and the opening assisting portion 19 as a whole is asymmetrical with respect to the center line L1. It is formed in a trapezoidal shape. In the present embodiment, the inclination angle α of the first opening assist folding curve 21A is set to approximately 45 degrees, and the inclination angle β of the second opening assist folding curve 21B is set to approximately 35 degrees.

  The grip assist folding curves are a pair of first grip assist folding curves 22A and 22B extending from the slit 20 toward the side walls 11A and 11B so as to form a substantially V shape, and parallel to the side walls 11A and 11B. And a pair of second holding assist folding curves 23A and 23B. These folding assist folding curves 22A, 22B, 23A, and 23B are constituted by reverse ruled folding curves formed by placing rules from the cover 2 side. The first holding assist folding lines 22A and 22B are inclined and extended outward from the center (top) of the slit 20 to the second folding curve 18 which is a boundary line with the continuous side walls 11A and 11B. In the form, they are provided symmetrically with respect to the center line L1. Moreover, the edge part which is an intersection with the 2nd folding line 18 is provided so that it may correspond to the both ends (the side top part of the curved part 20a) of the slit 20. FIG. The second holding assist folding curves 23A and 23B are provided in parallel so as to extend in the orthogonal direction with respect to the second folding curve 18 from the side tops of the curved portion 20a that are both ends of the slit 20. As a result, the end portions of the first holding assist folding curves 22A and 22B and the second holding assist folding curves 23A and 23B intersect with each other on the second folding curve 18 to form a substantially M-shape. Yes.

  In this packaging box blank, the side wall 11A is bent with respect to the end wall 10A, the end wall 10B is bent with respect to the side wall 11B, and the glue margin portion 12 and the side edge of the end wall 10B overlapping in this state are acetic acid. Affixed with vinyl emulsion adhesive. In this state, the product is shipped to a predetermined manufacturer and assembled for use.

  Specifically, after the lower inner flaps 15A and 15B are bent with respect to the end walls 10A and 10B, the lower outer flaps 17A and 17B are bent with respect to the side walls 11A and 11B. Then, the overlapped lower inner flaps 15A and 15B and lower outer flaps 17A and 17B are attached with an adhesive (hot melt) made of a hot-melt resin.

  Thereafter, a predetermined product is accommodated from the upper side in an unsealed state, and after the upper inner flaps 14A and 14B are bent with respect to the end walls 10A and 10B, the upper outer flaps 16A and 16B are bent with respect to the side walls 11A and 11B. It is done. Then, the superimposed upper inner flaps 14A and 14B and upper outer flaps 16A and 16B are attached with a hot-melt resin.

  As shown in FIGS. 3 and 4, the packaging box sealed in this way is formed with hot melt bonding regions R1, R2 on both sides of one outer flap 16A, 16B, 17A, 17B. In the present embodiment, the side on which the first opening assist folding curve 21A is provided is the first sticking area R1, and the side on which the second opening assist folding curve 21B is provided is the second sticking area R2. . And some of these sticking area | regions R1 and R2 are located in the lower part of folding curves 21A and 21B for opening assistance. In other words, the opening assist folding lines 21A and 21B are provided so as to extend across the sticking regions R1 and R2.

  When opening the packaging box, for example, the operator places a thumb in the formation region of the holding assist folding curves 22A, 22B, 23A, 23B between the slit 20 of the upper outer flap 16A and the second folding curve 18. Or press other fingers except the thumb and press down. As a result, as shown in FIG. 5, the holding assist folding curves 22A, 22B, 23A, and 23B are valley-folded to generate a step with the slit 20 as a boundary. At this time, in this embodiment, since the slit 20 is provided with a full length capable of inserting the hand of a human body, it can be recognized that the opening is performed using the slit 20. And since the level | step difference which made the slit 20 a boundary can be easily formed by the folding curves 22A, 22B, 23A, and 23B for holding assistance, opening workability | operativity can be improved.

  In this state, a finger is inserted into the inner surface side of the opening assisting portion 19 located on the upper side and pulled upward. As a result, at the leading edge of the upper outer flaps 16A and 16B that face each other, the leading edge of the upper outer flap 16A into which the finger is inserted is lifted, and the remaining fingers are inserted between the upper outer flaps 16A and 16B to assist opening. The part 19 is gripped. In this state, the upper outer flap 16A is in a state where the valley is bent along the folding assist folding lines 21A and 21B.

  Next, the operator pulls up the opening assisting portion 19. At this time, as shown in FIG. 6, first, the side of the adhesion region R1 between the upper outer flap 16A and the upper inner flap 14B located on the right side in the drawing is peeled off. Thereafter, as shown in FIG. 7, the side of the upper outer flap 16A and the upper inner flap 14A located on the left side in the drawing is peeled off.

  Next, after the sticking area | region R1 peels, the effect | action by which sticking area | region R2 peels is demonstrated concretely.

  First, when the opening assisting portion 19 is pulled up, the opening assisting portion 19 surrounded by the opening assist folding curves 21A and 21B and the slit 20 is raised. In this case, in this embodiment, the folding assisting folding lines 21A and 21B are provided on both sides of the slit 20, so that the upper outer flap 16A has a protruding dimension and the direction of the middle shin 4 in advance. A valley line along the designed folding assist folding lines 21A and 21B can be formed.

  In the state where the opening assisting portion 19 is grasped and pulled up, the height T at which both ends of the slit 20 are separated from the upper inner flaps 14A and 14B is the same. On the other hand, the folding assist folding lines 21A and 21B have different inclination angles α and β by varying the distances S1 and S2 from the center positions L1 to the tip positions P1 and P2, and therefore the upper inner flaps 14A and 14B. Each inclination angle in the height direction with respect to 14B is different. This inclination angle corresponds to the amount of displacement in the vicinity of the sticking regions R1 and R2, and the displacement amount on the first opening assist folding curve 21A side is larger than that on the second opening assist folding curve 21B side. And this displacement acts as a force which cancels (peels) adhesion of adhesion field R1 and R2, respectively.

  That is, in the present embodiment, the opening assisting portion 19 is formed asymmetrically with the inclination angles α and β of the opening assist folding curves 21A and 21B being different, and therefore, a pair of attachment regions R1, which are located on both sides. The force acting on R2 can be biased. As a result, the first opening assist folding line 21B where the first opening assist folding curve 21A where the displacement is large and the force acts strongly is peeled first, and then the second opening assist folding curve 21B is positioned. The remaining sticking region R2 to be peeled can be peeled later.

  Incidentally, the distribution action of the opening force greatly affects the total force applied when opening the upper outer flap 16A. That is, when applying a uniform force to the pair of sticking regions R1 and R2 and peeling, a force twice as large as the force when peeling the single sticking region R1 is required. On the other hand, in the present embodiment, the force acting as described above can be distributed to the pasting regions R1 and R2 even if the opening operation is performed by gripping the center where the force is evenly distributed in the related art. As a result, as a total force, it has been confirmed by a tensile test that the packaging box of this embodiment can be opened with a force of about 60%.

  In the above description, the case where the upper outer flap 16A is opened has been described as an example. However, the same applies to the case where the other upper outer flap 16B is opened and the other lower outer flaps 17A and 17B are opened. It is. Of course, when one of the upper outer flaps 16A and 16B or the lower outer flaps 17A and 17B is opened and then the rest is opened, only the leading edge may be directly grasped and opened.

  In the example of the opening operation, a finger is inserted into the tip edge of the upper outer flap 16A and the slit 20 and grasped to perform the opening operation. However, the finger is placed between the tip edges of the upper outer flaps 16A and 16B. The unsealing operation may be performed so that the tip edge of one upper outer flap 16A is pulled up. Alternatively, the opening operation may be performed so that a finger is inserted into the slit 20 of the upper outer flap 16A and the tip edge side is pulled up. Even if it does in these ways, the effect | action and effect similar to the above can be acquired.

  8 to 10 show the packaging box of the second embodiment. This packaging box is greatly different from the first embodiment in that the folding assist folding curves 22A, 22B, 23A, and 23B are not provided.

  Specifically, as shown in FIG. 8, the packaging box blank of the second embodiment is provided with the opening assisting portion 19 only on the upper outer flaps 16A and 16B, and is provided with upper and lower restrictions. Then, the slit 20 is provided at a position biased toward the second folding line 18 that is a boundary with the side walls 11A and 11B as compared with the first embodiment, so that the folding assist folding lines 21A and 21B formed at both ends are provided. The entire length of 21B is configured to be long. This configuration makes it impossible for the operator to grip the opening assisting portion 19 from the leading edge of the upper outer flaps 16A and 16B to the slit 20, so that the slit 20 of this embodiment is It does not take into consideration and is configured to be linear. Further, the slit 20 is configured to have a short overall length so that the leading end positions P1, P2 of the folding assist folding curves 21A, 21B having a long total length are surely positioned on the leading edges of the upper outer flaps 16A, 16B. . Further, the opening assist folding curves 21A and 21B are constituted by reverse rules provided with rules from the cover 2 side instead of the lead rules shown in the first embodiment.

  As shown in FIG. 9, the packaging box blank is formed by bending the side wall 11A with respect to the end wall 10A, bending the end wall 10B with respect to the side wall 11B, and overlapping the glue margin 12 and the side edge of the end wall 10B. The product is shipped to the manufacturer with the label attached. After folding the lower inner flaps 15A, 15B, the lower outer flaps 17A, 17B are bent, and these overlapping portions are attached by hot melt, and after receiving a predetermined product, the upper inner flaps 14A, After 14B is bent, the upper outer flaps 16A and 16B are bent, and these overlapping portions are adhered by hot melt.

  When opening the packaging box, the operator inserts a finger between the leading edges of the upper outer flaps 16A and 16B, for example, places the finger on the inner surface of the distal end of the upper outer flap 16A and pulls it upward. As a result, the upper outer flap 16A has a step with the slit 20 as a boundary, and a state where the upper outer flap 16A is bent along the folding assist folding curves 21A and 21B.

  When further force is applied in this state, the upper outer flap 16A and the upper inner flap 14A are attached after the upper outer flap 16A and the upper inner flap 14B are peeled off, as shown in FIG. The region R2 side is peeled off.

  11 to 13 show the packaging box of the third embodiment. This packaging box is greatly different from the first embodiment in that an opening assisting portion 19 is provided only on one upper outer flap 16A among the four outer flaps 16A, 16B, 17A, 17B. .

  Specifically, as shown in FIG. 11, the blank of the packaging box of the third embodiment has a slit 20 having an arc shape and a pair of opening assist folding curves 21A and 21B in the upper outer flap 16A. An opening assisting portion 19 is provided, and grip assist assist folding lines 22A, 22B, 23A, and 23B are provided. The slit 20 is provided at a position where the center line L2 in the width (lateral) direction is laterally offset from the center line L1 of the upper outer flap 16A on the side where the first folding assist folding line 21A is provided. Therefore, the left and right sides are asymmetric with respect to the center line L1. Further, the folding assist folding lines 21A and 21B are constituted by the same lead rule as in the first embodiment, and the inclination angles α and β are the same. Further, the first holding assist folding curves 22A and 22B extend from the center of the upper outer flap 16A to the positions corresponding to both ends of the slit 20 on the second folding curve 18 instead of the center of the slit 20. Provided.

  When opening the packaging box of the third embodiment, the operator performs an opening operation similar to that of the first embodiment. And in this 3rd Embodiment, when the opening assistance part 19 is pulled up, the opening assistance folding lines 21A and 21B and the opening assistance part 19 surrounded by the slits 20 are raised, and the opening assistance folding lines 21A and 21A, A valley line along 21B is formed.

  However, in the present embodiment, since the opening assisting portion 19 has the same inclination angles α and β of the opening assist folding curves 21A and 21B, the opening force distribution by the opening assist folding curves 21A and 21B is distributed. The action is even. However, in this embodiment, since the slit 20 itself is biased toward the side where the folding assist folding curve 21A is provided, the force acting on the pair of sticking regions R1, R2 located on both sides can be biased. As a result, after the first opening assist folding curve 21A where the force acts strongly is peeled off first, the remaining adhesion where the second opening assist folding curve 21B is located. The region R2 can be peeled later.

  In addition, the packaging box of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, the opening assisting portion 19 is provided in all the outer flaps 16A, 16B, 17A, and 17B in the first embodiment, only in the upper outer flaps 16A and 16B in the second embodiment, and in the third embodiment in the upper outer side. Although only the flap 16A is provided, the number and position of formation can be changed as desired.

  Further, in the first and second embodiments, the opening assist folding curve 21A is formed on the left side and the opening assist folding curve 21B is formed on the right side with respect to the opposing upper outer flaps 16A and 16B. The upper outer flap 16A forms the opening assist folding curve 21A on the left side and the opening assist folding curve 21B on the right side, while the other upper outer flap 16B forms the opening assist folding curve 21B on the left side, It is good also as a structure made into 21 A of folding curves for opening assistance. If it does in this way, with the upper outer flaps 16A and 16B sealed, the folding aid folding lines 16A and 16B can be positioned symmetrically (specular reflection shape) with the respective leading edges as boundaries.

  Further, in each of the above embodiments, the flaps 14A, 14B to 17A, 17B are connected to the upper and lower end edges of the end walls 10A, 10B and the side walls 11A, 11B. , 16B may be arranged continuously.

  Furthermore, in each of the embodiments described above, the outer flaps 16A, 16B, 17A, and 17B are formed with the same projecting dimensions, and the leading edges of each other are abutted at the center in the upper and lower opening portions. As long as the leading edge is set to a size that matches, the protruding size may be different.

  And in each said embodiment, although it was set as the hexahedral structure comprised by the cover wall which consists of end wall 10A, 10B, side wall 11A, 11B and flap 14A, 14B-17A, 17B, each end wall 10A, 10B and side wall 11A, It is good also as a structure which provided the chamfering wall between 11B.

It is a top view which shows the blank of the packaging box of 1st Embodiment. (A), (B), (C), (D) is the principal part expanded sectional view of FIG. It is a perspective view which shows the packaging box of 1st Embodiment which concerns on this invention. It is a top view of the packaging box of FIG. It is a perspective view which shows one process at the time of opening of the packaging box of 1st Embodiment. It is a perspective view which shows another 1 process at the time of opening of the packaging box of 1st Embodiment. It is a perspective view which shows the unsealed state of the packaging box of 1st Embodiment. It is a top view which shows the blank of the packaging box of 2nd Embodiment. It is a perspective view which shows the packaging box of 2nd Embodiment. It is a perspective view which shows one process at the time of opening of the packaging box of 2nd Embodiment. It is a top view which shows the blank of the packaging box of 3rd Embodiment. It is a perspective view which shows the packaging box of 3rd Embodiment. It is a perspective view which shows 1 process at the time of opening of the packaging box of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Corrugated paper 2 ... Cover 3 ... Back paper 4 ... Middle shin 10A, 10B ... End wall 11A, 11B ... Side wall 12 ... Glue margin 13 ... First folding curve 14A, 14B ... Upper inner flap 15A, 15B ... Lower side Inner flaps 16A, 16B ... Upper outer flaps 17A, 17B ... Lower outer flaps 18 ... Second folding curve 19 ... Opening assisting portion 20 ... Slit 20a ... Arc-shaped curved portions 21A, 21B ... Opening assist folding curve 21a ... Folding curve 21b ... cutting line 22A, 22B ... first grip assist folding curve 23A, 23B ... second grip assist folding curve

Claims (6)

An outer flap having a pair of opposing end walls and side walls, an inner flap being connected to at least one end of each of the end walls, and overlapping each other on the outer surface of the inner flap on each side wall. In the packaging box sealed by sticking the overlapping parts of these flaps,
An opening having at least one outer flap having a slit extending along a leading edge thereof and a pair of opening assist folding curves extending from both ends of the slit so as to extend outwardly toward the leading edge of the outer flap. Provide an auxiliary part,
A packaging box, wherein the opening assisting portion is formed asymmetrically with reference to a center line extending in the same direction as the protruding direction of the outer flap.   The packaging box is made of corrugated paper in which corrugated shins are provided between a front cover and a back paper, and the shins are configured to extend along the protruding direction of the outer flap. The packaging box according to claim 1.   The opening assisting portion is formed asymmetrically by providing the slit so as to be positioned at the center in the width direction of the outer flap, and forming the folding assist folding curves at different inclination angles. The packaging box according to claim 1 or 2.   The packaging box according to claim 1 or 2, wherein the opening assisting portion is formed asymmetrically by providing the slit at a position that is laterally deviated from the center in the width direction of the outer flap.   The packaging according to any one of claims 1 to 4, wherein a pair of gripping assist folding curves extending outwardly from the intermediate position of the slit toward the continuous side wall are provided. box.   The packaging box according to any one of claims 1 to 5, wherein a pair of gripping assist folding curves extending from substantially both ends of the slit toward a continuous side wall are provided.

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