JP5828749B2 - Packaging box - Google Patents

Description

  The present invention relates to a packaging box.

  2. Description of the Related Art Conventionally, a rectangular parallelepiped packaging box formed of corrugated paperboard or the like is folded flatly for recycling or disposal after taking out an article to be packaged. Specifically, the upper and lower flaps of the packaging box are opened and the opposite corners of the rectangular cylindrical barrel are bent at an acute angle so that the side wall of the barrel is overlapped and folded flat.

  However, if the packaging box is made of a material with a relatively large bending stiffness such as corrugated paperboard, it will be easy to lift from the state where the side wall of the body part is piled up due to the restoring force and the flat folded state is maintained It may not be done. For this reason, there is an inconvenience that when a plurality of packaging boxes folded flat after use are stored or moved in a stacked state, a stable stacked state cannot be obtained and handling is troublesome.

  Therefore, conventionally, a packaging box is known that maintains a state in which the body is folded flat using a flap connected to the upper edge of the body (see Patent Document 1 below). In this packaging box, an inner flap is connected to a pair of upper edges that are short sides, and an outer flap is connected to a pair of upper edges that are long sides among the upper edges of a rectangular body in plan view. Yes. On one outer flap, a locking piece is formed by providing a cut from the front end to the base end. When the body is folded flat, the side end of the other outer flap is inserted into the notch, and the locking piece is inserted between the side end of the other outer flap and the inner flap adjacent to the outer flap. In this way, the body is folded and kept in a folded state.

JP 2003-170925 A

  However, since the notch for forming the locking piece is provided from the tip of one outer flap toward the base end, even if the side end of the other outer flap is cut, the locking force is Very small. Then, when the body is folded, it has a great restoring force at the corner of the body that is bent at an acute angle. The engagement between the outer flaps may be released.

  In addition, if a cut is formed in the outer flap from its distal end to the proximal end, the strength of the outer flap may be reduced.

  In view of the above-described points, an object of the present invention is to provide a packaging box that can reliably maintain a folded state of a body portion while suppressing a decrease in strength of a flap or the like.

  The present invention provides a cylindrical body portion formed by four side walls connected through four corners and opening in a rectangular shape, and a pair of crease lines on a pair of end edges which are long sides among opening end edges of the body portion. And a pair of long side flaps that are bent inwardly of the body part so as to be perpendicular to the side wall, the pair of facing the body parts by opening both long side flaps When the body portion is folded flat by bending both corners of the two together to form a superposed portion where the side ends of both long side flaps are superposed, at least one corresponding to the superposed portion A locking portion is provided at a predetermined position along the side edge of the long side flap to insert and lock the side edge of the other long side flap when the overlapping portion is formed.

  According to the present invention, it is possible to provide a locking portion at a predetermined position along the side edge of at least one long side flap, and to insert and lock the side end of the other long side flap into this locking portion. Therefore, the other long side flap can be relatively firmly locked by the one long side flap, so that the state where the body portion is folded flat can be reliably maintained.

  In addition, the said latching | locking part can be formed by a notch or a notch, for example. When the locking part is formed by a notch or a cut, a direction parallel to the direction in which the boundary line extends along the boundary line (generally a crease line) between the body part and the long side flap. By making the notch or cut into the notch, it is possible to firmly obtain the locking state of the other long side flap to the locking portion.

  Furthermore, not only is a locking portion provided at a predetermined position along the side edge of one long side flap, but also the side of the other long side flap corresponding to the locking portion when the overlapping portion is formed. Another locking portion can be provided at a position along the edge. In this way, a stronger locking state can be formed by locking the both locking portions with each other, so that the body portion can be maintained in a flatly folded state. Since the shape of each latching part should just be formed in the length which becomes substantially half of the overlap dimension of the said superposition | polymerization part, both the latching parts can be made small and the strength reduction of a long side flap can be prevented reliably. .

The perspective view which shows the external appearance of the packaging box of embodiment of this invention. The top view which shows the expansion | deployment state of the packaging box of FIG. III-III sectional view taken on the line of FIG. Explanatory drawing which shows a part of folding operation | work of the packaging box of FIG. Explanatory drawing which shows a part of folding operation | work following FIG. Explanatory drawing which shows the state by which the packaging box was folded. Explanatory drawing which shows the latching state of a latching | locking part. Explanatory drawing which shows the modification of a latching | locking part. Explanatory drawing of the latching | locking part in other embodiment.

  An embodiment of the present invention will be described with reference to the drawings. The packaging box 1 of the present embodiment has a rectangular parallelepiped appearance in the assembled state as shown in FIG. 1, and one main panel 2 and two in the unfolded state before assembly as shown in FIG. This is a so-called Bliss box made of corrugated paperboard.

  As shown in FIG. 2, the main panel 2 includes a bottom plate 4 at the center position. A first side plate 5 is connected to the front and rear edges (upper and lower edges in FIG. 2) of the bottom plate 4 via a crease line a. An outer flap 6 (long side flap) is connected to the front end edge of each first side plate 5 via a crease line b.

  Side adhesive strips 7 are continuously provided on both end edges (left and right end edges in FIG. 2) of the first side plate 5 via a crease line c. A lower adhesive piece 8 is continuously provided at both end edges (left and right end edges in FIG. 2) of the bottom plate 4 via a crease line d.

  Each of the two side panels 3 has the same shape, and includes a second side plate 9 and an inner flap 10 connected to the tip edge of each second side plate 9 via a crease line e.

  A cutting tape 11 is attached to the bottom plate 4 and the lower adhesive pieces 8 on both sides thereof, and the cutting tape 11 can be easily picked at the ends of the lower adhesive piece 8 corresponding to both ends of the cutting tape 11. A cut 12 is formed for this purpose. Further, perforation lines (not shown) for enabling breakage are partially provided in the crease line d at the boundary between the bottom plate 4 and the lower adhesive piece 8 as long as the strength is not lowered.

  In addition, concave notches 13 (locking portions) are formed at predetermined positions along both side edges (left and right edges in FIG. 2) of the outer flap 6.

  The first side plate 5 is raised with respect to the bottom plate 4 via the crease line a. Each second side plate 9 is bonded by a side bonding piece 7 and a lower bonding piece 8. Thereby, as shown in FIG. 3, the bottomed trunk | drum 15 which an upper part opens rectangularly is formed by the four side walls (the 1st side board 5 and the 2nd side board 9) connected via the four corner | angular parts 14. As shown in FIG. The

  As shown in FIG. 2, the outer flap 6 is connected to the leading edge of each first side plate 5 that is the long side of the opening edge of the body portion 15. On the other hand, the inner flap 10 is connected to the distal end edge of each second side plate 9 which is the short side of the opening edge of the body portion 15. Thereby, when the packaging box 1 is assembled as shown in FIG. 1, the outer flap 6 is longer in the horizontal direction than the inner flap 10.

  When the body portion 15 is formed, subsequently, the inner flap 10 is tilted horizontally, the outer flap 6 is superposed on the inner flap 10, and the outer flaps 6 are butted against each other, as shown in FIG. The part 15 is closed. Note that the abutting portions at the tips of the outer flaps 6 are sealed by sticking with a sealing tape or the like (not shown).

  The packaging box 1 configured in this manner opens the outer flap 6 and the inner flap 10 and takes out the inner package. It is then folded flat for recycling or disposal.

  Next, the folding operation of the packaging box 1 will be described. First, as shown in FIG. 4, the packaging box 1 from which the article to be packaged is taken out is inverted so that the bottom plate 4 is cut with the tape 11 (see FIG. 2). And the bottom plate 4 divided into two is pulled up to stand on the first side plate 5. At this time, the bottom plate 4 and the lower adhesive piece 8 are separated by the aforementioned perforation.

  Thereby, as shown in FIG. 5, when the top-and-bottom direction of the packaging box 1 is returned, the upper and lower sides of the trunk portion 15 are opened. Then, the two corners 14 facing on either diagonal of the body part 15 are both bent at an acute angle, and the body part 15 is folded flat as shown in FIG.

  At this time, the body portion 15 has a rectangular shape in plan view, and the lateral length of the outer flap 6 is longer than the inner flap 10, so that the side end portions of both outer flaps 6 are superposed. Part 16 is formed. As shown in FIG. 6, in the overlapping portion 16, notches 13 formed in both outer flaps 6 are positioned corresponding to each other.

  Next, as shown in a partially enlarged view in FIG. 7, the notch 13 of one outer flap 6 and the notch 13 of the other outer flap 6 are engaged with each other. Thereby, both the outer flaps 6 will be in a connected state, and the state where the trunk | drum 15 was folded flat is maintained.

  Thus, according to the packaging box 1 of the present embodiment, the notch 13 is provided at a predetermined position along the side edge of the outer flap 6, and the notch 13 is directed in a direction parallel to the crease line b. Therefore, the locking state of the notches 13 can be strengthened. Thereby, even if it tries to return to a cylinder shape by the restoring force from the state in which the trunk | drum 15 was folded flat, the flat state of the trunk | drum 15 can be reliably maintained by the firm latching state of both the notches 13. FIG. . And even if the restoring force from a flat state is especially large like the Bliss box in which the adhesion part by the side part adhesive piece 7 is formed in the vicinity of the four corners 14, the packaging box 1 is surely flat. Maintained.

  Moreover, in the packaging box 1 of this embodiment, the notch 13 is formed in each predetermined position along the both-sides edge (right-and-left edge in FIG. 2) of the outer flap 6, Therefore The trunk | drum 15 When the corner 14 facing the diagonal of any one of the diagonals of the body 15 is selected and bent to an acute angle, the notches 13 are engaged with each other at the overlapping portions 16 of the outer flaps 6. Workability is good because it can be stopped.

  Furthermore, in the packaging box 1 of this embodiment, since the notches 13 are formed in the outer flaps 6, the size of the notches 13 can be made relatively small, and the strength of the outer flaps 6 can be reliably reduced. To be prevented.

  In this embodiment, the notch 13 is used as the locking portion of the present invention. In addition, as shown in FIG. 8, the locking portion of the present invention is provided at the side edge of both outer flaps 6 as shown in FIG. A cut line 17 may be formed at a predetermined position along the line, and the cut lines 17 may be locked.

  Moreover, in this embodiment, although the example which provided the notch 13 in each side edge part of the both outer flaps 6 was shown, it is not restricted to it, For example, as shown in FIG. In the case of another packaging box (not shown) in which the portion 18 is formed, the notch 13 may be provided only on one outer flap 6. Also by this, since the notch 13 is provided at a position along the side edge of one outer flap 6, the other outer flap 6 in which the notch is not formed can be sufficiently locked. .

  Further, in the present embodiment, as shown in FIG. 2, a so-called Bliss box composed of one main panel 2 and two side panels 3 has been described, but the present invention is not limited to this. For example, Although not shown, the locking portion of the present invention can also be suitably used for a so-called A-type cardboard box. Furthermore, in other packaging boxes including a long side flap that constitutes the top plate and a long side flap that constitutes the bottom plate, like the A-type cardboard box, each long side provided on the top plate side and the bottom plate side By providing the locking portion of the present invention to the flap, the long side flaps can be locked on both the top plate side and the bottom plate side, and the flatly folded state can be further strengthened.

  Further, in the present embodiment, the packaging box 1 made of corrugated cardboard has been described, but the material of the packaging box 1 is not limited to this, for example, even when plastic corrugated board or the like is used as a material, The same effect as the above embodiment can be obtained.

  DESCRIPTION OF SYMBOLS 1 ... Packaging box, 5 ... 1st side plate (side wall), 6 ... Outer flap (long side flap) 9 ... 2nd side plate (side wall), 13 ... Notch (locking part), 14 ... Corner | angular part, 15 ... Body Part, 16, 18 ... overlapped part, 17 ... cut (locking part).

Claims (1)

Formed by four side walls connected through four corners, a cylindrical body part that opens in a rectangular shape, and a pair of edges that are long sides among the opening edges of the body part are connected via a crease line. It is a packaging box comprising a pair of long side flaps that are installed and bent in the body part inner direction so as to be perpendicular to the side wall,
Opening both long side flaps and bending the pair of opposite corners of the body part to an acute angle together, when the body part is folded flat, a superposition part is formed where the side ends of both long side flaps overlap each other In what
At a predetermined position along the side edge of at least one long side flap corresponding to the overlapped portion, a locking portion for inserting and locking the side end of the other long side flap when the overlapped portion is formed is provided. A packaging box characterized by that.

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