JP4896648B2 - Smoothly opening packaging box - Google Patents

Description

  The present invention relates to a packaging box for packaging confectionery, pharmaceuticals, and the like. More specifically, the present invention relates to a packaging box that is provided with a rotating lid and can be opened by smoothly rotating the lid even when the wall surface of the packaging box body is curved.

2. Description of the Related Art Conventionally, packaging boxes with recloseability that can be kept closed after being opened once are known.
FIG. 1 shows a packaging box disclosed in Patent Document 1. A rotating lid 10 is formed at the upper end of the box body, and the engaging flap 11 provided at the upper front end of the box body engages with the engaging flap 12 provided on the inner surface side of the lid, Realizes recloseability.

  In general, when a sheet-like blank paper is assembled to form a packaging box as shown in FIG. 1, the “paper eye” is in the direction of arrow A in FIG. 1 (the direction perpendicular to the rotation axis R of the lid 10). ). This is because the click sound when the flaps are engaged with each other at the time of reclosing is increased, and the operational feeling is improved.

When the “paper eyes” are aligned in the direction of the arrow B orthogonal to the arrow A, the direction of the flap folds and the direction of the “paper eyes” coincide with each other.
When the lid 10 is opened first, the box body and the lid 10 are divided by breaking a break line such as a perforation. Depending on the shape of the break line, the wall surface of the box body may be broken at the time of breakage. It may be torn along the “paper eyes” inadvertently in the lateral direction (almost along the arrow B).

  For the reasons described above, it is preferable that the “paper eyes” be aligned with the direction of arrow A in FIG. However, in that case, another problem arises that the pivotable lid 10 cannot be opened smoothly. This will be described with reference to FIG.

  FIG. 2A is a perspective view schematically shown by cutting horizontally in the middle of the box in the height direction. When the “paper eyes” are aligned in the direction of the arrow A, this causes the wall of the box to bend outwardly (for the sake of clarity, the degree of curvature is actually Than exaggerated).

In such a box with a curved wall surface, when the lid 10 is rotated and opened, the fold 15 is provided along the rotation center as shown in FIG. However, the lid 10 cannot be opened smoothly due to the resistance caused by the curvature of the back wall.
If it is forcibly opened in that case, a part of the box (a part where the stress is easily concentrated, such as a corner) may be torn carelessly or the wall surface may be bent in order to release the accumulated stress.

JP-A-10-230970

  Accordingly, an object of the present invention is to provide a packaging box that can smoothly open the lid even when the wall surface of the box is curved so as to bulge outward.

  The present invention has been devised to effectively solve the above problems, and provides a packaging box having the following features.

  The packaging box of the present invention is provided with a fold as a rotation center at a certain distance from one end edge of the back wall and a lid that rotates around the fold. In addition, a feature is provided in the vicinity of the center position of the fold on the back wall that “a stress release buckling deformation region including a buckling line that releases the stress generated in the back wall when the lid is opened by buckling”. It is said.

  “Buckling line” means that the back wall buckles along this line to release the stress. For example, it can be composed only of creases, but “buckling” The “line” is preferably composed of “penetration cut” and “crease”.

When opening the rotation type lid, if the back wall including the fold serving as the rotation center is curved outward, it is generally difficult to rotate the lid due to the resistance caused by the curvature. If this is forcibly rotated, there will be inconveniences such as part of the box being torn or the wall of the box being bent.
However, in the packaging box of the present invention having the above-described configuration, buckling occurs in the buckling line included in the “stress releasing buckling deformation region”, and the stress is thereby released, so part of the box is inadvertently Inconveniences such as tearing and bending of the wall surface can be effectively prevented.

  Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 3 is a perspective view showing the packaging box 50 according to one embodiment of the present invention from the back side.

≪Overall structure of box≫
The overall basic configuration of the packaging box of the present invention is the same as that shown in FIG. 2B, and includes a box body 51 and a lid 52 that rotates relative thereto.
On the back wall 55 of the box, a fold 58 is formed at a certain distance from the upper edge 55a, and the lid 52 rotates around this fold 58.
“Fold” means that the back wall can be folded along this line, so that the lid can be rotated, and it is sufficient that the sewing machine includes a simple crease or a through cut. Other suitable configurations can be adopted.

≪Meaning of stress release buckling deformation area≫
The packaging box of the present invention is different from the conventional example in that a stress release buckling deformation region 60 described below is provided on the back wall 55. When the stress release buckling deformation region 60 does not exist, the packaging box can smoothly open the lid 52 due to the curvature generated in the back wall 55 as in the conventional example described in FIG. If you open it forcibly, a part of the box will tear or bend.
The cause is considered to be that there is no escape space for the stress generated in the back wall, and the stress is eventually released by “tearing” or “breaking”.

  In the present invention, the stress release buckling deformation region 60 is provided in order to escape the accumulated stress well and avoid the “tear” or “break” of the box. This means that this region 60 itself buckles and deforms in order to relieve stress.

≪Configuration of stress release buckling deformation area≫
First, the configuration of the stress release buckling deformation region 60 will be described. FIG. 4 is a blank 70 constituting the packaging box of the present invention, and FIG. 5 is an enlarged view of the stress release buckling deformation region 60 therein. The direction A in FIG. 5 corresponds to the direction A in FIG.
The illustrated stress release buckling deformation region 60 includes the following three types of through cuts.
(1) A pair of “horizontal-shaped through-cuts 71, 72” facing each other on the fold 58 and having the central portions 71 a, 72 a away from each other.
(2) A pair of “vertical vertical through-cuts 81, 82” facing in a direction orthogonal to the fold 58 and having the central portions 81a, 82a moving away from each other.
(3) A cross through cut 90 that is surrounded by each through cut and overlaps the horizontal arm 91 with the fold 58 and the vertical arm 92 extends perpendicularly thereto.

  Each of the above through cuts is linearly connected by a crease. In FIG. 5, only the crease 100 connecting the through cuts 71 and 82 is illustrated, but the other parts are similarly connected by the crease, and these “penetration cuts” and “folds” It constitutes a “buckling line”. The “buckling line” means that buckling occurs along this line, as will be described later.

≪Operation of stress release buckling deformation area≫
FIG. 3 shows an enlarged stress relief buckling deformation region 60 in a state where the lid 52 is being opened.

  As shown in FIG. 3, when the lid 52 is opened while the back wall 55 is curved, a part (M) in the rhombic stress release buckling deformation region 60 is raised as a mountain fold. The part (V) is recessed and depressed. This is because buckling occurs in the “buckling line” formed by the above-described “penetration cuts” and “folding rules”. As a result, the stress generated in the back wall is released.

≪Other configurations of stress release buckling deformation area≫
The specific geometric shape (arrangement) of the “penetration cut” and “crease” in the stress release buckling deformation region is not limited to the illustrated one. For example, “arc”, “elliptical arc”, and “other deformation curve” can be adopted instead of the shape of “ku”, and the central cross through cut 90 can be omitted. Further, as shown in the figure, the cut lines constituting the “vertical character” and “horizontal character” do not necessarily have to exist as a pair, and two of them are facing the same direction even on only one side. Also good.
In addition, it is sufficient if the stress can be released by buckling, and the buckling line can be formed only by the creases.

≪Buckling line using so-called lead rule≫
FIG. 6 is a cross-sectional view illustrating an aspect of “penetration cut” included in “buckling line”. The “penetration cut” may be a simple one formed by penetrating the entire thickness of the flat blank 70 as shown in FIG. 6A. It is preferable to adopt a configuration called “lead rule”. In addition, in FIG.6 (b), the lower surface of the blank 70 is a surface corresponding to the internal space of a packaging box.
The “lead ruled line” is a cut formed through the entire thickness of the blank along the bottom of the depressed groove 75. In the vicinity of the stress release buckling deformation region 60 provided along the fold 58 on the back wall of the packaging box, the bending force acts mainly in the direction indicated by the arrow D in FIG. By using it, the bending becomes easy and the stress can be easily released. As a result, the lid 52 can be rotated more smoothly.

≪Application to packaging box with recloseability≫
Naturally, the stress release buckling deformation region 60 can be applied to a packaging box having no recloseability. However, it is particularly beneficial to provide this for a recloseable packaging box as shown in FIG. The packaging box 170 is obtained by assembling the blank 70 of FIG.

On both sides of the upper end of the front wall of the packaging box 170, there are two locking flaps 177a and 177a bent forward. On the other hand, locking flaps 177b and 177b corresponding to these exist on the inner surface side of the lid.
When the lid 52 is turned to the front side and closed, the locking flaps 177a and 177b are engaged with each other on both sides of the box, and the closed state is maintained with a snapping sound. When a force is applied in the direction to open the lid 52, the engagement flaps 177a and 177a are bent (elastically deformed), so that the engagement is released.

In FIG. 7, the blank piece 175 remaining on the inner surface side of the lid 52 (both sides of the blank piece 175 constitute the aforementioned locking flaps 177b and 177b) is a substantially Ω-shaped break in FIG. This is the portion that has been torn along line 178.
That is, after assembling the blank 70 and assembling the packaging box 170, when opening the packaging box for the first time, it is necessary to break the substantially Ω-shaped breaking line 178 and divide it.

However, the substantially Ω-shaped break line 178 has a long road along it, and it is necessary to apply a relatively large force in the direction of arrow F to the lid 52 in order to break through such a break line 178. In addition, since the “paper eyes” run in the direction of the arrow A, a large force acts in the F direction from the viewpoint of breaking the breaking line 178 extending across this.
Even if such a large force acts in the F direction, the rotation of the lid 52 can be smoothly moved by the stress release buckling deformation region 60. Accordingly, the lid 52 is smoothly turned, and the lid 52 comes to the open position shown in FIG.

  If the stress release buckling deformation region 60 does not exist, resistance to the rotation of the lid 52 is large, so that the force in the F direction cannot be favorably swiveled. As a result, the lid 52 is inadvertently (in FIG. 7 Inconveniences such as tearing off (upward) may occur. Even if it does not go until it can be torn off, it is fully conceivable that the portion of the fold 58 is torn.

  By providing the stress release buckling deformation region 60 of the present invention, such inconvenience can be effectively avoided.

The perspective view which shows the conventional packaging box. The perspective view which shows the conventional packaging box. The principal part perspective view explaining the packaging box which concerns on one Embodiment of this invention. The expanded view which shows an example of the blank which comprises the packaging box of this invention. The figure which expands and shows the part of the stress relief buckling deformation area | region in FIG. Sectional drawing explaining a through cut and a lead rule. The perspective view which shows the packaging box obtained by assembling the blank of FIG. 4 in the state which opened the lid | cover.

Explanation of symbols

10 Lid 11, 12 Locking flap 15 Fold 50 Packing box 51 Box body 52 Lid 55 Back wall 58 Fold 60 Stress release buckling deformation region 70 Blank 71, 72 Horizontal character through cut 75 Groove 81, 82 Vertical Cross-cut 90 90 Cross-cut 91 Horizontal arm 92 Cross-cut vertical arm 100 Folded line 170 Packaging box 175 Blank pieces 177a, 177b Locking flap 178 Approx. Ω-shaped break line

Claims (2)

A packaging box provided with a fold (58) as a center of rotation at a certain distance from one end edge (55a) of the back wall, and a lid (52) that rotates about the fold (58). Because
In the vicinity of the center position of the fold (58) on the back wall, a stress release buckling deformation region (60) including a buckling line that releases the stress generated in the back wall when the lid is opened by buckling is provided. And
The buckling line is composed of a through cut and a crease.
The buckling line is
A set of horizontal through-cuts (71, 72) facing each other on the fold (58) and having the central portions (71a, 72a) away from each other;
A pair of vertical cross-cuts (81, 82) facing in a direction perpendicular to the fold (58) and having central portions (81a, 82a) away from each other;
A cross arm (90) that is surrounded by each of the through-cuts, overlaps the horizontal arm (91) with the fold, and the vertical arm (92) extends perpendicularly thereto. Characteristic packaging box.   The packaging box according to claim 1, characterized in that the through cut included in the buckling line is formed along the bottom of the groove (75) recessed toward the inside of the box.