JP5486788B2 - Bottom-lock packaging box and its blank - Google Patents

Description

  The present invention relates to a packaging box for packing articles, and more particularly to a bottom-lock packaging box that can be assembled by one-touch by bending a plate-shaped blank.

  Conventionally, in the case of storing and transporting various articles such as cosmetics such as lipsticks, bottom lock type packaging boxes that can be assembled with one touch have been widely used (for example, see Patent Document 1). An example of such a bottom lock type packaging box is shown in FIG. Referring to FIG. 8 where the upper side of the paper surface is the upper side, the lower side of the paper surface is the lower side, and the horizontal direction is the horizontal direction of the paper surface, the bottom lock type packaging box shown in FIG. Are separated by a vertical fold line 20, and two bottom pieces 24, 26 and tongue pieces 28, 30 are respectively provided on the lower ends of the side plates 12, 14 and the end plates 16, 18 via a horizontal fold line 22. And a blank 10 made of corrugated paper or paperboard, in which a top plate 34 and an insertion piece 36 are connected to the upper end side of the side plate 14 via a lateral fold line 32. ing.

  And the fitting notches 38 and 40 are provided in the approximate center front-end | tip of each bottom piece 24 and 26. As shown in FIG. In addition, a fold line 42 is provided in an oblique direction from the upper end corner of each bottom piece 24, 26 toward the fitting notch 38, 40, whereby the substantially triangular fixing pieces 44, 46 are formed on the bottom pieces 24, 26. The tongue pieces 28 and 30 are formed closer to each other.

  When assembling such a blank 10 into a packaging box, it is folded along a longitudinal folding line 20, and then each of the two tongue pieces 28, 30, and the bottom pieces 24, 26 are each along a lateral folding line 22. Fold it in. Then, the fixing pieces 44 and 46 are valley-folded along the bend line 42 in the oblique direction, and the front surfaces of the tongue pieces 28 and 30 and the back surfaces of the fixing pieces 44 and 46 are attached, respectively. And the side edges of the side plates 12 and 14 are connected. Thereby, the blank of the state folded flat is completed. When the blank 10 is raised in a square tube shape with one touch, the fitting notches 38 and 40 of the bottom pieces 24 and 26 are fitted to each other, and the bottom of the packaging box is fixed. In this way, a packaging box with an open lid is assembled. Finally, after the article is stored in the packaging box, sealing is completed by bending the top plate 34 and inserting the insertion piece 36 into the back surface of the side plate 12.

  On the other hand, a box structure is known in which the repulsive force at the time of bending is reduced by providing a notch in a portion where the folding line is concentrated, such as the corner of the bottom surface of the box (for example, the ease of assembly is increased (for example, , See Patent Document 2).

JP 2006-69566 A No. 6-50337

By the way, in the above-mentioned conventional bottom lock type packaging box, when the folded sleeve-shaped blank is raised and the box is assembled, the fitting portion of the bottom plate tends to rise toward the inside of the box. And the front-end | tip part of the bottom pieces 24 and 26 protruded toward the inner side of the box. For this reason, when dozens of relatively small and lightweight items such as lipstick cosmetics are put in the box, the bottom piece acts like a leaf spring and pushes the item to the lid side, and it must be pushed with a load from above. There were problems such as the lid not closing properly.
Further, in the above-described conventional bottom lock type packaging box, when the folded sleeve-shaped blank is raised and the box is assembled, the fitting portion of the bottom plate rises toward the inside of the box as described above, and the bottom Locking may be insufficient. In this case, for example, in the case of a rectangular parallelepiped packaging box, the planar shape of the bottom plate does not become a square shape but a parallelogram shape slightly distorted obliquely.

  Therefore, when using the above-mentioned conventional bottom lock type packaging box, it is possible to use a packaging box that is slightly larger in size in the vertical and horizontal directions than the stored items in consideration of the floating of the bottom piece or distortion during assembly. It was. In this way, a volume that allows the product to surely enter the box is ensured.

  However, using a box having a size that is excessively large relative to the size of the stored item in this way is wasteful of the material of the box and creates an extra space inside the box.

  Furthermore, the vibration accompanying the transport of the packaging box causes the bottom piece that behaves like a leaf spring to swing the item on it, causing fluttering. If it does so, goods will rub and goods will be damaged. As described above, an item placed on a non-flat bottom surface is easily damaged by falling or sliding.

  Further, when a load in an oblique direction is applied to such a box, it is easily crushed, which is disadvantageous in terms of strength. Furthermore, if a large number of such distorted boxes are stacked, it may cause a load collapse.

  On the other hand, in order to reduce the load at the time of assembly and reduce distortion, in the box in which the above-mentioned conventional folding line is concentrated, a relatively large notch is formed on a relatively thin paper blank. Is provided, the strength is lowered, and the box is easily crushed by a load from an oblique direction of the box.

  The present invention has been made in view of the above-described circumstances, and suppresses the floating of the bottom plate of the bottom lock type box to secure a volume for storing articles inside the box, and the degree of fitting in the bottom lock and An object of the present invention is to provide a packaging box and a blank thereof that can increase the strength resistance against a load to crush the box and ensure the ease of assembling the box.

In order to solve the above problems, one embodiment of the packaging box according to the present invention is a bottom-locking packaging box formed by folding and assembling a plate-shaped blank, and the blank is vertically Three or more side plates sequentially connected via a fold line (hereinafter referred to as a “first fold line”), and a lateral fold line (hereinafter referred to as a “second fold line”) at each lower edge of the side plate. Fitting step portion that is provided on at least one of the bottom plate and the bottom plate connected via a fold line) and engages with the other bottom plate when the packaging box is assembled. The bottom plate having the fitting step portion is provided with at least one bending promoting fold line extending from the fitting step portion toward the second fold line side, and the fitting step The second plate connecting the bottom plate and the side plate having a portion The bending line is provided with a notch, and each of the bending promotion fold lines extends from the fitting step portion toward the second fold line so as to form a substantially V shape in the bottom plate. a fold line, and wherein the Rukoto provided so as to form a substantially isosceles triangle having a base of said second fold line and the hypotenuse of the two flexure promoting fold line.

In this embodiment, when the assembled packaging box is placed on a horizontal surface with the bottom face down, the vertical direction is `` up and down direction '', the direction perpendicular to it is `` lateral direction '', and the edge part in contact with the horizontal surface of the side surface is This is referred to as the “lower edge”.
In this embodiment, since the blank has three or more side plates, a packaging box for storing an arbitrary article in which the bottom surface shape is an arbitrary polygon including a triangle, a quadrangle, a pentagon, and a hexagon is included. It is. Furthermore, the case where the lid plate is connected to the upper edge of the side plate is included, and the case where the member serving as the glue margin is connected during the assembly is also included.
In the case where the fitting step portion and the other bottom plate are fitted together, this includes the case where the fitting step portions are fitted together, and the fitting step portion and the fitting step portion of the other bottom plate are included. The case where it fits with the area | region which is not provided is also included.

  According to this embodiment, the bending-promoting fold line provided on the bottom plate constituting the bottom plate of the box functions like a hinge by the weight of the item when the item is put in the packaging box, and the bottom plate is It acts to bend toward the outside of the box. Since the bending of the bottom plate to the outside of the box occurs in a direction that cancels out the rising amount of the bottom plate to the inside of the box, the sinking of the product to the bottom surface of the box is promoted. As a result, the product is prevented from being pushed upward.

According to the present embodiment, the notch formed in the second fold line acts so as to cancel the load transmission between the bottom plate and the side plate and release the constraint on the displacement of the bottom plate. The bottom plate is more easily bent toward the outside of the box. As a result, the floating of the bottom plate into the box can be more reliably suppressed.
According to this embodiment, since the substantially V-shaped bending promoting fold line functions like a hinge, the bottom plate is a box for each area of two substantially isosceles triangular surfaces formed with the approximate center as a vertex. It becomes easy to bend toward the outside. Since the portion to be easily bent extends over a wide area as a substantially isosceles triangular surface region, the bottom plate is more reliably suppressed from rising into the box.

  Another embodiment of the packaging box according to the present invention is characterized in that a bending guide line is provided in a region on the tip side of the fitting step portion of the bottom plate having the fitting step portion.

Here, the “tip side” means the tip side when a cantilever bottom plate that can be swung with the second fold line as a hinge portion is considered.
According to this embodiment, since the bending guide wire is provided in the region on the tip side of the fitting step portion of the bottom plate, when the article is put in the packaging box, the bending guide wire is like a hinge. It functions and guides the end of the bottom plate to bend downward. For this reason, the front end side of the bottom plate can be prevented from protruding upward in the box.

  Another embodiment of the packaging box according to the present invention is characterized in that a notch is provided at a location where the fold lines intersect.

  According to this embodiment, for example, the notch portions are provided at the four corners of the bottom surface where the fold lines intersect, so that the repulsive force when the blank is folded and assembled into the box can be reduced. Further, since the stress at the four corners of the bottom surface is reduced, the bottom surface shape can be prevented from being distorted into a substantially parallelogram shape.

  Another embodiment of the packaging box according to the present invention is characterized in that at least one of the bending accelerating fold lines is provided with a fitting cut portion having a predetermined length starting from the fitting step portion.

  According to this embodiment, when the respective fitting step portions are fitted to each other, the fitting cut portion having a predetermined length starting from the fitting step portion provided in the bending promoting fold line is provided on the other bottom plate. Or it can mesh with the fitting notch part provided in the board for other bottoms, and can increase the fitting degree between fitting level | step-difference parts. For this reason, the coupling | bonding degree of the board for bottom faces which comprises a bottom board can be raised more. Moreover, since a bottom plate becomes difficult to distort, the intensity | strength of the packaging box as a three-dimensional structure can be improved. Further, the presence of the deflection promoting line strengthens the meshing and increases the strength of the box bottom.

  In another embodiment of the packaging box according to the present invention, the length of the second fold line is substantially divided into three by the intersection of each of the bending fold lines and the second fold line. And

  According to this embodiment, since the length of the second fold line is approximately divided into three by the intersection of each bending promotion fold line and the second fold line, the bottom plate can be more easily bent out. Can do.

  In another embodiment of the packaging box according to the present invention, at least one first bending guide line is provided in a region on the tip side of the bottom plate with respect to the fitting step portion in parallel to the second broken line. When the packaging box is assembled, the tip side of the bottom plate is guided to bend downward in the packaging box with respect to the first bending guide line.

  In another embodiment of the packaging box according to the present invention, the bottom plate is provided with at least one second bending guide line that is non-parallel to the second bending line, and the second bending guide line has one end. When the packaging box is assembled, the bottom plate is provided on at least a part of a straight line that is located on the tip side of the fitting step portion and the other end extends in a direction not intersecting with the bending promotion fold line. The leading end side of the second bending guide line is bent and guided downward in the packaging box.

  According to these embodiments, since at least one first bending guide line is provided in a region on the front end side of the fitting step portion of the bottom plate in parallel with the second bent line, the packaging box When an article is put in, the first or second bending guide line functions like an articulated hinge to guide the bottom side plate to bend downward. Therefore, when the product is put in the packaging box, the tip of the bottom plate does not push the product upward, and the sinking of the product to the bottom surface of the box is promoted.

  Other embodiments of the packaging box according to the present invention are provided in parallel to the bottom plate so that the plurality of first and second bending guide lines do not intersect each other, and when the packaging box is assembled, A tip side of the bottom plate from the portion where the first and second bending guide lines are provided is bent and guided in an arc shape downward in the packaging box.

According to this embodiment, since a plurality of the first and second bending guide wires are prepared, the bottom plate functions as an articulated hinge when the product is put in the packaging box, and the bottom plate of the product is More portions can contribute to the downward bending of the bottom plate. Therefore, the bottom plate is guided to bend downward as a whole, and the product is not pushed up upwards, and the sinking of the product to the bottom of the box is promoted, and at the same time, the distortion of the packaging box can be minimized. it can.
Further, the bottom plate is guided not only at the front end side but also bent downward in the box as a whole, so that even if the bottom lock is insufficient, the fitting step portion and the other bottom surface are corrected. The fitting degree of the plate can be increased, and the strength of the packaging box as a three-dimensional structure can be improved. Therefore, distortion of the packaging box can be minimized.
According to this embodiment, the first and second bending guide lines function as articulated hinges, and when the article is put into the packaging box, the bottom plate of the packaging box bends to the outside of the box by the bending promotion folding line. It is guided to be bent toward the protruding part. Therefore, the front end side of the bottom plate is guided to be surely bent downward in the packaging box.

  In another embodiment of the packaging box according to the present invention, the first and second bending guide wires are arranged in the thickness direction on the plate surface of the bottom plate facing the box when the packaging box is assembled. It is characterized by being provided by making a cut with a depth up to the middle.

  According to this embodiment, when the packaging box is assembled, the first and second bending guide wires are arranged on the plate surface of the bottom plate facing the box. Therefore, when the packaging box is assembled, the plate surface of the bottom plate facing the box is provided with a cut in depth to the middle in the thickness direction. The distal end side of the bending guide portion is movable downward from the bottom surface. Therefore, the bottom plate is guided to bend downward as a whole, and the first bottom surface having the above-mentioned fitting step portion is promoted while promoting the sinking of the item into the box bottom without pushing up the item upward. When the work plate and the second bottom plate to be fitted with it are brought into contact with each other and fitted, the edge on the front end side of the first and second bottom plate is easily aligned. Thus, the blank assembling work is facilitated.

  In another embodiment of the packaging box according to the present invention, the blank includes the four side plates, and the first side plate, the first side plate, the second side plate, and the second side plate are used as the side plate. Are connected in order, and as the bottom plate, first and second bottom plate flaps are respectively provided on the lower edges of the first and second side plates via the second fold line, respectively. First and second bottom plate auxiliary pieces are provided on the lower edge of each of the second end plates via the second fold line, and the fitting step portion is formed on the tip side of each of the bottom plate flaps. The bottom is formed by folding the blank along the folding lines and fitting the fitting step portions of the bottom plate flaps to each other, and connecting the first end plate and the second side plate to form a rectangular parallelepiped Or it is assembled in the shape of a cube.

ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the bottom plate of a bottom lock type box floats toward the box inner side. For this reason, it is possible to increase the sinking of the stored item and secure a volume for storing the item in the box. Thereby, waste of the material of a box can be prevented and it can prevent that an extra space is formed in a box.
In addition, the packaging box according to the present invention can be easily assembled, and the shape of the bottom surface of the box when assembled is closer to a square shape and is less likely to be distorted into a substantially parallelogram. The strength reduction can be reduced.

(First embodiment)
Hereinafter, the packaging box which concerns on 1st Embodiment of this invention, and the blank which comprises it are demonstrated with reference to drawings.
FIG. 1 is a schematic plan view showing a blank as a development view of the packaging box according to the first embodiment of the present invention. FIG. 2 is a schematic perspective view showing the packaging box according to the first embodiment of the present invention, and shows a state where the lid is opened. FIG. 3 is a schematic perspective view showing the packaging box according to the first embodiment of the present invention, as viewed from the bottom side of the box. FIG. 4 is a view showing a bent state on the distal end side of the extending piece of the packaging box according to the first embodiment of the present invention, and is a cross-sectional view taken along the line AA of FIG. In FIG. 1, the following description will be made with the upper side of the drawing as the upper side, the lower side of the drawing as the lower side, the left side of the drawing as the left, and the right side of the drawing as the right.

  As shown in FIG. 1, the blank 200 of the packaging box 100 according to the first embodiment of the present invention includes a first rectangular plate 50, a first side plate 52, a second side plate 54, and a second side plate 56. 58 are sequentially provided in the left-right direction via vertical folding lines 60, and a substantially rectangular lid plate 64 and an insertion piece are respectively provided on the upper edges of the second side plates 56 via horizontal folding lines 62. 66 are sequentially provided. Then, first and second bottom plate flaps 70 and 72 are respectively provided on the lower edges of the first and second side plates 52 and 56 via a fold line 68 in the left-right direction. Substantially triangular first and second bottom plate auxiliary pieces 76 and 78 are respectively provided on the lower edge of each 54 via a folding line 74 in the left-right direction. In the bottom plate flaps 70 and 72, fitting step portions 80 and 82 are formed at substantially the lower ends in the center in the left-right direction. Moreover, the notch part 84 is provided in the location where each fold line used as the four corners of the bottom plate of a box cross | intersects.

  In each of the bottom plate flaps 70 and 72, two bending promoting fold lines 86 as bending promoting portions are provided in a substantially V shape so as to extend from the fitting stepped portions 80 and 82 to the upper edge side. The bending promoting fold line 86 functions as a hinge that promotes the weight of the bottom plate to bend toward the outside of the box when an article is put into the assembled box. By doing so, the bending of the bottom plate to the outside of the box is promoted. In addition, a cut portion 88 is provided along the fold line 68 in a section in the substantially central portion in the left-right direction on the upper edge side of each of the bottom plate flaps 70 and 72 sandwiched between the upper ends 86 a and 86 b of the bending promotion fold line 86. By doing so, the load transmission between the bottom plate flaps 70 and 72 and the side plates 52 and 56 is cut off, the restraint against the displacement of the bottom plate is released, and the bottom plate is promoted to bend out toward the outside of the box. .

  On the other hand, in the left region of the bottom plate flaps 70 and 72, extending pieces 90 and 92 extending downward are formed. The extending pieces 90 and 92 have a substantially triangular shape whose length in the left-right direction is shortened as it goes below the fitting stepped portions 80 and 82, and the fitting stepped portions of the extending pieces 90 and 92 Below 80 and 82, a reverse folding ruled line 94 as a bending guide line is provided in a direction parallel to the folding line 68 at the upper edge of each bottom plate flap 70 and 72. When the article is placed on the bottom surface of the box, the reverse folding ruled line 94 functions like a hinge and bends the leading end side of the extended piece toward the lower side of the box.

  Further, a substantially triangular tongue-like piece 98 is provided in the right region of each bottom plate flap 70, 72 via an oblique folding line 96 provided from the end of the upper edge toward the fitting stepped portions 80, 82. It is formed. A cut is formed in the middle portion of the fold line 96 along the fold line.

  The fitting step portions 80 and 82 have contour shapes extending from the lower end of the fold line 96 of each tongue-like piece 98 toward the center in the left-right direction and bent downward, and connected to the roots of the extension pieces 90 and 92, respectively. It is configured.

  When assembling the packaging box 100 as shown in FIG. 2 and FIG. 3 using this blank 200, first, the blank 200 is bent along the folding lines 60, 62, 68, 74 to the back surface side. And the square tube part of a box is formed by sticking the back surface side of the 1st end plate 50, and the surface side of the connecting piece 58. FIG. Next, the bottom plate flaps 70 and 72 are folded inside the square tube, and the extension pieces 90 and 92 are overlapped on the inside of the box, and the tongue-like pieces 98 are placed on the outside of the box, and fitted. The step portions 80 and 82 are brought into contact with each other and fitted.

  Then, the folding line 96 in the oblique direction of each tongue-like piece 98 is folded and folded so that the tip thereof is outside the box, and the back side of each bottom plate auxiliary piece 76, 78 is brought to the front side of each bottom plate flap 70, 72. Overlapping each other. The bent tongue pieces 98 are returned to their original positions, and the back surface side of each tongue piece 98 and the front surface side of each bottom plate auxiliary piece 76, 78 are bonded together. By doing so, the bottom plate portion of the box is formed. And finally, the packaging box 100 is assembled by putting goods etc. from the opening of the upper surface of the assembled box and inserting the insertion piece 66 of the cover plate 64 into the back side of the first side plate 52.

As described above, the bending promoting fold line 86 is a fold line extending two from the fitting stepped portions 80 and 82 toward the upper edge so as to form a substantially V shape in the bottom plate flaps 70 and 72, respectively. Each of the bottom plate flaps 70 and 72 is formed with a substantially isosceles triangular surface region having the two bending promoting fold lines 86 as the hypotenuse and the fold line 68 at the upper edge as the base. The upper ends 86a and 86b of the bending promoting fold lines 86 are provided so as to be located at locations where the lengths of the fold lines 68 on the upper edges of the bottom plate flaps 70 and 72 are approximately divided into three equal parts.
In addition, a fitting cut section 102 having a predetermined length is provided on the lower end side of one bending promoting fold line 86 so as to increase the degree of fitting between the fitting step portions 80 and 82. .

The operation and operation of the above configuration will be described.
When a plurality of relatively lightweight items such as lipsticks are stored in the packaging box 100 according to the first embodiment of the present invention, the abbreviations provided symmetrically to the bottom plate flaps 70 and 72 constituting the bottom plate of the box. The V-shaped bending promoting fold line 86 and the notch 88 provided along the fold line 68 at the upper edge of each bottom plate flap 70, 72 receive the weight of the product and the bottom plate bends toward the outside of the box. Promote to put out. Since the bending of the bottom plate to the outside of the box occurs in a direction that cancels out the rising amount to the inside of the box, the sinking of the article to the bottom surface of the box is promoted. Thereby, it is reduced that the item is pushed up to the upper side of the box. Therefore, it is not necessary to push the article to the bottom side when closing the lid.

  On the other hand, a reverse folding ruled line 94 as a bending guide line provided on the distal end side of the extended pieces 90 and 92 of the bottom plate flaps 70 and 72 is shown in FIG. When it is placed on the card, it functions like a hinge by the weight of the product, and guides the extended pieces 90 and 92 on the tip side of the reverse folding ruled line 94 to bend downward in the box. For this reason, the front end side of the extension pieces 90 and 92 does not protrude upward. Therefore, the product is not pushed upward and does not prevent the product from sinking into the bottom of the box. Further, by providing the reverse folding ruled line 94 at the leading end side of the extended pieces 90, 92, that is, at a substantially intermediate portion between the extended pieces 90, 92, the extended pieces 90, 92 are formed by the weight of the product. It is easy to be crushed to the bottom side by folding downward at the part. For this reason, since it becomes difficult to act like a leaf | plate spring at the time of conveyance like the conventional packaging box, generation | occurrence | production of the damage by friction between goods is suppressed.

  Further, by providing the bending promoting fold line 86 and the cut portion 88, the rising amount of the bottom plate to the inside of the box is offset. For this reason, since the storable volume formed inside the box becomes larger than that of the conventional packaging box, it is not necessary to use an oversized box. Therefore, the material of the box is not wasted and no extra space is generated inside the box.

  Furthermore, when the packaging box 100 is folded and assembled, the notches 84 provided at the four corners of the bottom surface of the box reduce the repulsive force against the bending at the four corners, so that the box can be assembled easily.

Next, the measurement result of the amount of lifting of an article performed to confirm the effect of the packaging box 100 according to the first embodiment of the present invention will be described with reference to FIGS. 5A, 5B, 5C and a table. In the following description, the embodiment described in detail above will be described as “Example 1”. FIG. 5A is a schematic perspective view illustrating a measurement state of a lift amount of an article in the first embodiment.
And the form which cut | disconnected the front end side of the extension pieces 90 and 92 by the reverse folding ruled line 94 in the packaging box 100 of Example 1 is described as "Example 2", and is demonstrated. FIG. 5B is a schematic perspective view illustrating a measurement state of the amount of lifting of an article in the second embodiment.
Further, the embodiment in which the cutout portions 84 are not provided at the four corners of the bottom of the box in the packaging box of Example 1 will be described as “Example 3”. FIG. 5C is a schematic perspective view illustrating a measurement state of the amount of lift of an article in Example 3. The bottom plate flaps of Examples 1 to 3 are provided with a substantially V-shaped bending promoting fold line 86.
The form of the conventional bottom lock type packaging box 10 will be described as “conventional example”.

  In this measurement, as shown in FIG. 5A, a prismatic product is put in the packaging box, and the upper edge side of the product is placed on the upper edge side of the packaging box. The distance in the vertical direction of each of the right side central part, the left side central part, and the front central part was measured, and the average value of these three values was taken as the amount of lift of the product. In this case, when the product protrudes upward from the upper edge of the packaging box, it becomes a positive numerical value, and when it sinks downward from the upper edge, it becomes a negative numerical value.

  In addition, the dimensions of the packaging box used for the main measurement are a horizontal length of the box of 154 mm, a depth of the box of 106 mm, a height of the box of 82 mm, and a corrugated paper having a thickness of about 1.2 mm. On the other hand, a prismatic body having a width of 140 mm, a depth of 100 mm, a height of 79 mm, and a weight of 45 g was used as an item put in the packaging box.

  Tables 1 to 4 show the measurement results of the amount of lifting of items related to Example 1, Example 2, Example 3, and the conventional packaging box. Here, in this measurement, in consideration of measurement error reduction, measurement is performed on specimens of 10 packaging boxes for each form. The unit of the numerical values displayed in the table is mm.

  Table 5 summarizes and summarizes the measurement results of Tables 1 to 4. The average value of 10 pieces in Table 5 refers to the average value of 10 specimens, and the maximum value and the minimum value refer to the maximum measured value and the minimum measured value of 10 specimens of each form. . In addition, symbols such as “O” and “X” in the columns of the component “notches at the four corners”, “tip side of the extension piece”, and “reverse folding ruled line” do not have “O” when the component is included. In this case, “x” is written.

  As shown in Table 5 in which the measurement results are tabulated, the amount of lifting of the articles is 0.5 mm, 3 mm, 4.45 mm, and 7.5 in Example 1, Example 2, Example 3, and the conventional example, respectively. It was 55 mm. Comparing Examples 1 to 3 with the conventional example as a reference, Example 1 is the most effective in the present invention because the amount of lift of the product is the smallest and the product is satisfactorily sinking. I can say that. In particular, according to Example 1, the lift amount of the conventional product, which was 7.55 mm, is a very small amount of 0.5 mm. Thus, it can be seen that the effect of the present invention is exhibited well. Following Example 1, Example 2 in which the tip end side of the extended piece was cut by a reverse folding ruled line was removed second, and Example 3 in which notches were not provided at the four corners of the box bottom was 3 It can be said that the effects of the present invention are exhibited.

  In the above embodiment, instead of providing the reverse folding ruled line 94 as the bending guide line, a perforation line or a folding line may be provided, and the leading ends of the extension pieces 90 and 92 are guided to be bent downward. If present, a cut may be provided. Preferably, the line starts from the tip side of the fitting step part, and more preferably, the starting point is between the fitting step part and the tip. Furthermore, the line is not limited to a line parallel to the folding line 68 at the upper edge of the bottom plate flaps 70 and 72, and may be an oblique line or a plurality of lines. Even if it does in this way, there can exist the same effect as this embodiment, the lift of the extension pieces 90 and 92 can be suppressed, and the volume for articles | goods accommodation can be ensured inside a box.

  In the above-described embodiment, the position where the bending guide line is provided is preferably a position that guides the leading ends of the extension pieces 90 and 92 to be bent downward. For example, the packaging box has a lateral length of 150 mm. When the length is about 100 mm, the height is about 80 mm, and the cardboard paper is about 1.2 mm thick, the bending guide lines 90 and 92 are 1 to 2 cm away from the fitting step portions 80 and 82. It is preferable to provide each on the side.

  In the embodiment described above, the size of the notches 84 provided at the four corners of the bottom surface of the box is formed in a substantially circular shape having a diameter approximately 3 to 6 times the thickness of the blank of the packaging box. Is preferable in the configuration of the present embodiment.

  In the above embodiment, the case where the shape of the packaging box is a hexahedron such as a rectangular parallelepiped or a cube has been described. However, the present invention is not limited to a hexahedron, and for example, is applied to a packaging box whose bottom is a regular hexagon. In this case, a bending-promoting fold line may be provided on the bottom plate flap, and a reverse folding ruled line may be provided on the extended piece. Even if it does in this way, there can exist the same effect as this invention, it can suppress the raising of a bottom lock, and the sinking of goods can be accelerated | stimulated, and the volume for articles | goods accommodation can be ensured inside a box.

  In the above embodiment, the blank to be used is particularly effective in a corrugated cardboard having a relatively large thickness (1 mm or more).

As described above, in the packaging box and the blank according to the present invention, it is possible to suppress the bottom plate of the bottom lock from being lifted to the inside of the box. And while sinking of a stored item can be raised, the volume for storing the item can be secured inside the box. Thereby, waste of the material of a box can be prevented and it can prevent that an extra space is formed in a box.
Moreover, the packaging box which concerns on this invention can be assembled easily, and can reduce the strength reduction of the box as a three-dimensional structure.

(Second Embodiment)
Hereinafter, embodiments of a packaging box and a blank constituting the packaging box according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 6: is a schematic plan view which shows the blank used as the expanded view of the packaging box based on 2nd Embodiment of this invention. FIG. 7 is a schematic perspective view showing a packaging box according to the second embodiment of the present invention, and shows a state where a lid is opened. In FIG. 6, the following description will be made with the upper side of the page as the upper side, the lower side of the page as the lower side, the left side of the page as the left, and the right side of the page as the right.
Further, members having the same or similar shape or function as those of the first embodiment are given the same reference numerals, and detailed description thereof is omitted.

  The blank 400 constituting the packaging box 300 according to the second embodiment of the present invention has a first reverse folding ruled line 150 as two first bending guide lines parallel to the folding line 68 in the left-right direction and one end of the blank 400. Two second bends provided on at least a part of a straight line that is located on the tip side of the joint step portion, the other end does not intersect with the bending promotion fold line, and extends in a direction that is not the tip of the bottom flaps 70 and 72 A second reverse folding ruled line 152 as a guide line, and the first and second bending guide lines are provided in parallel to the bottom plate so as not to cross each other. Moreover, in the blank 40 which concerns on this embodiment, when the said packaging box is assembled, by making the notch | incision of the depth to the middle of the thickness direction in the board surface of each bottom board flap 70 and 72 which faces in a box Is provided. In FIG. 6, the blank 400 is viewed from the direction in which the first and second bending guide lines 150 and 152 are arranged on the paper surface.

  As shown in FIG. 6, the first reverse folding ruled lines 150 as the two first bending guide lines are formed on the upper and lower sides of the extension pieces 90 and 92 formed on the lower side of the left region of the bottom flaps 70 and 72. It is provided as a straight line parallel to the fold line 86 so that the length in the direction is substantially divided into three. Further, the first reverse folding ruled line 150 as the first bending guide line is provided by cutting a depth from the surface of the extending pieces 90 and 92 to the middle in the thickness direction. The first reverse folding ruled line 150 can be formed by a half-cutting blade from the surface of the extending pieces 90 and 92 in the drawing.

  In addition, the bottom flaps 70 and 72 are sandwiched between the bending-promoting fold line 68 extending from the fitting stepped portions 80 and 82 to the point 86a on the fold line 68 and the upper edges of the extension pieces 90 and 92 in the left region. The region includes a second reverse folding ruled line 152 as two second bending guide lines. The second reverse folding ruled line 152 is one point on the front end side from the fitting step on the outer edge of the bottom plate of the bottom flaps 70, 72, toward the direction other than the front end of the bottom flaps 70, 72, and promotes the bending. It is provided as a straight line that does not intersect with the fold line 86. The second reverse folding ruled line 152 as the second bending guide line is provided by cutting a depth from the surface of the bottom flaps 70 and 72 to the middle in the thickness direction. The second reverse folding ruled line 152 can be formed by a half-cutting blade from the surface of the extending pieces 90 and 92 in the drawing.

  In addition, at least a part of the plurality of first and second reverse folding ruled lines 150 and 152 is provided so as to be almost radial from the fitting step portions 80 and 82 of the bottom flaps 70 and 72. Therefore, when the article is put into the packaging box 300 formed by assembling the blank 400, the bottom flaps 70 and 72 are moved toward the portion where the bottom plate of the packaging box 300 bends to the outside of the box by the bending promotion fold line 86. The tip side is guided to be bent.

  As shown in FIG. 7, the dimensions of the packaging box 300 according to the present embodiment are about 105 mm in width, 95 mm in depth, 90 mm in height, and about 1.2 mm in thickness so that the bottom surface is close to a square. Is formed. In this case, the distance between the fold line 68 and the portion of the fitting stepped portions 80 and 82 parallel to the fold line 68 is about 50 mm. Then, the two first reverse crease lines 150 are about 16 mm and about 26 mm from the portions parallel to the fold line 68 of the fitting step portions 80 and 82, respectively, and the two second reverse crease lines 152 are Both of them are inclined at approximately 25 degrees and approximately 50 degrees from the direction parallel to the fold line 68 to the fold line 68 side, respectively, with a position approximately 10 mm from the portion parallel to the fold line 68 of the fitting stepped portions 80 and 82. Is preferred. When a plurality of the first and second reverse folding ruled lines 150 and 152 are formed in this way, when the article is put in the packaging box 300 formed by assembling the blank 400, the front end sides of the bottom flaps 70 and 72 are The bending-promoting fold line 86 ensures that the bottom plate of the packaging box 300 is bent toward the portion that bends out of the box.

  In the blank 400 according to the present embodiment, a first square plate 50, a first side plate 52, a second side plate 54, a second side plate 56, and a connecting piece 58 each having a substantially square shape are arranged in a horizontal direction via a folding line 60 in the vertical direction. The substantially square-shaped lid plate 64 and the insertion piece 66 are sequentially provided on the upper edge of the second side plate 56 via the left and right folding lines 62, respectively. Then, first and second bottom plate flaps 70 and 72 are respectively provided on the lower edges of the first and second side plates 52 and 56 via a fold line 68 in the left-right direction. Substantially triangular first and second bottom plate auxiliary pieces 76 and 78 are respectively provided on the lower edge of each 54 via a folding line 74 in the left-right direction. In the bottom plate flaps 70 and 72, fitting step portions 80 and 82 are formed at substantially the lower ends in the center in the left-right direction. Moreover, the notch part 84 is provided in the location where each fold line used as the four corners of the bottom plate of a box cross | intersects. Therefore, the packaging box 300 as shown in FIG. 7 can be assembled using the blank 400 according to this embodiment in the same procedure as when the packaging box 100 is assembled using the blank 200 according to the first embodiment. .

The operation and operation of the above configuration will be described.
In the packaging box 300 according to the second embodiment of the present invention, a substantially V-shaped bending-promoting fold line 86 provided symmetrically to the bottom plate flaps 70 and 72 constituting the bottom plate of the box, and each bottom plate flap 70 and 72, the notch 88 provided along the fold line 68 on the upper edge, and a function as a hinge when an article is put in the packaging box, and the front end side of each bottom plate flap 70 and 72 is bent downward. A plurality of non-intersecting first and second reverse crease lines 150 and 152 are provided. That is, since the first and second reverse folding ruled lines 150 and 152 function as articulated hinges, when dozens of relatively small and light items are put in the packaging box 300, more items are added to the first and second items. The two reverse folding lines 150 and 152 can be in contact with each other, and the bottom flaps 70 and 72 are guided to bend downward as a whole. Therefore, it is possible to minimize the amount of rising of the bottom flaps 70 and 72 to the inside of the box, and to prevent the tip side of the bottom flaps 70 and 72 from protruding upward.

  In addition, the first and second reverse crease lines 150 and 152 are formed not only on the front side of the bottom flaps 70 and 72 but also on the whole when the item sinks below the packaging box 300 when the item is put in the packaging box 300. It is provided so that rising to the inside of the box can be suppressed. Therefore, when the packaging box 300 is assembled, even if the bottom lock is insufficient and the fitting portion of the bottom flaps 70 and 72 rises inward, it can be corrected. Moreover, by putting the goods in the packaging box, the fitting degree of the fitting stepped portions 80 and 82 can be increased, and not only the distortion of the packaging box as a three-dimensional structure can be reduced, but also the strength. Can be improved. Therefore, it is possible not only to prevent damage to items placed in the packaging box during transportation, but also to efficiently accumulate many packaging boxes in one place.

In addition, the packaging box 300 and the blank 400 constituting the packaging box 300 according to the second embodiment of the present invention are arranged in parallel with the bottom plate so that the plurality of the first and second reverse folding ruled lines 150 and 152 do not intersect each other. When the packaging box is assembled, the tip side of the bottom plate is guided to be bent in an arc downward from the portion where the first and second reverse folding ruled lines are provided. It is configured as follows. In addition, at least a part of the plurality of first and second reverse folding ruled lines 150 and 152 is provided so as to be almost radial from the fitting step portions 80 and 82 of the bottom flaps 70 and 72. Accordingly, the plurality of first and second reverse folding ruled lines 150 and 152 function as articulated hinges, and when the article is put into the packaging box 300, the bottom plate of the packaging box 300 is moved by the bending promotion folding line 86. It is guided so that the front end side of the bottom side flaps 70 and 72 is bent toward the part that bends out of the box. Therefore, when an article is put into the packaging box 300 formed by assembling the blank 400, the bottom side of the bottom flaps 70, 72 is surely placed on the outside of the box by the bending promoting fold line 86. It is guided to be bent toward the part that begins to bend.
In addition, even when the bottom surface of the product to be put in the packaging box 300 is uneven, any one of the plurality of first and second reverse folding ruled lines 150 and 152 efficiently receives the load and functions as a hinge. Can be fulfilled.

  Further, the first and second reverse folding ruled lines 150 and 152 are provided by making incisions having a depth from the surface of the bottom flaps 70 and 72 to the middle of the surface in the thickness direction. When the packaging box 300 is assembled, the bottom flaps 70 and 72 having the first and second reverse folding ruled lines 150 and 152 as articulated hinges are bent only downward, and a second reverse of the bottom flaps 70 and 72 is obtained. The front end side of the crease line 152 is guided so as to be surely bent downward. Therefore, the first and second reverse folding ruled lines 150 and 152 prevent the leading end sides of the bottom flaps 70 and 72 from protruding upward in the box, and at the same time, increase the rising amount of the bottom flaps 70 and 72 toward the inside of the box. It can be minimized.

  Further, the first and second reverse folding ruled lines 150 and 152 according to the present embodiment are such that the bottom flaps 70 and 72 are bent only in one direction. Therefore, in the assembling operation, the bottom flaps 70 and 72 are folded inside the rectangular tube, and the extending pieces 90 and 92 are arranged inside the box, and the tongue-like pieces 98 are arranged outside the box. When performing the operation of overlapping and fitting the fitting stepped portions 80 and 82 to each other, it becomes easier to align the outer edges on the front end side than the fitting stepped portions 80 and 82 of the bottom flaps 70 and 72. Assembly work becomes easy. In addition, the bottom flaps 70 and 72 are not mistakenly bent upward during the operation of putting the item into the packaging box 300, and the packaging item 300 can be used for economical packaging and transportation of the item. it can.

  In the above embodiment, the second reverse folding ruled line 152 is one point on the tip side from the fitting step portion on the outer edge of the bottom surface plate of the bottom flaps 70, 72, in a direction that is not the tip of the bottom flaps 70, 72. Oppositely, it is provided as a straight line that does not cross the bending promoting fold line 86. However, the second reverse folding ruled line 152 may be provided as a part of the straight line within a range where a sufficient effect is recognized.

  Moreover, in the said embodiment, although the 1st and 2nd reverse folding ruled lines 150 and 152 were provided two each, it is not limited to this number, Furthermore, the 1st reverse folding ruled line 150 or the 2nd reverse folding ruled line 152 of Only one of them may be provided.

Moreover, in the said embodiment, the 1st and 2nd reverse folding ruled lines 150 and 152 are formed by the half-cutting blade from the surface of each baseplate flap 70 and 72, and when each said packaging box 300 is assembled, each facing in a box The bottom plate flaps 70 and 72 are provided by making a depth of cut in the thickness direction in the plate surface. However, you may comprise as a broken line by a cutting blade, and you may form as a broken line by a muscle pushing blade.
Moreover, a perforation line and a fold line may be provided, and notches may be provided as long as the bottom plate flaps 70 and 72 are directed downward in the packaging box 300 as a whole. Even if it does in this way, there can exist the same effect as this embodiment.

As described above, in the packaging box and the blank according to the present invention, the floating of the bottom plate of the bottom lock to the inside of the box can be reliably suppressed. And while sinking of a stored item can be raised, the volume for storing the item can be secured inside the box. Thereby, waste of the material of a box can be prevented and it can prevent that an extra space is formed in a box. Further, the bottom lock can be prevented from becoming insufficient, and distortion of the box can be reduced by putting an article in the box.
In addition, the packaging box according to the present invention can be easily assembled.

It is a schematic plan view which shows the blank used as the expanded view of the packaging box which concerns on the 1st Embodiment of this invention. It is a schematic perspective view which shows the packaging box which concerns on the 1st Embodiment of this invention, and is a figure which shows the state by which the cover was opened. It is a schematic perspective view which shows the packaging box which concerns on the 1st Embodiment of this invention, and is the figure seen from the bottom face side of the box. It is the figure which showed the bending state of the front end side of the extension piece of the packaging box which concerns on the 1st Embodiment of this invention, and is sectional drawing along the AA of FIG. It is a schematic perspective view which shows the measurement state of the amount of lifting of the goods in Example 1. FIG. It is a schematic perspective view which shows the measurement state of the amount of lifting of the goods in Example 2. FIG. It is a schematic perspective view which shows the measurement state of the amount of lifting of the goods in Example 3. FIG. It is the schematic which shows the blank used as the expanded view of the packaging box which concerns on the 2nd Embodiment of this invention. It is a schematic perspective view which shows the packaging box which concerns on the 2nd Embodiment of this invention, and is a figure which shows the state by which the cover was opened. It is a schematic plan view of the blank used as the expanded view of the conventional bottom lock type packaging box.

Explanation of symbols

50 First end plate 52 First side plate 54 Second end plate 56 Second side plate 58 Connecting piece 60, 62, 74 Folding line 64 Cover plate 66 Inserting piece 68 Folding line 70 on the upper edge of the bottom plate flap 70 First bottom plate flap 72 Second bottom plate Flap 76 First bottom plate auxiliary piece 78 Second bottom plate auxiliary piece 80, 82 Fitting stepped portion 84 Notch portion 86 Deflection promoting fold line 88 Cut portion 90, 92 Extension piece 94 Reverse folding ruled line 96 Diagonal folding line 98 Tongue Shape piece 100 Packaging box 102 Fitting cut part 200 Blank 150 First reverse folding ruled line 152 Second reverse folding ruled line

Claims (11)

A bottom lock type packaging box formed by folding and assembling a plate blank,
The blank is
Three or more side plates connected in sequence via vertical folding lines (hereinafter referred to as “first folding lines”);
A bottom plate connected to each lower edge of the side plate via a lateral fold line (hereinafter referred to as "second fold line");
Provided on at least one of the bottom plate, and when the packaging box is assembled, it includes a fitting step portion that fits with the other bottom plate,
The bottom plate having the fitting step portion is provided with at least one bending promoting fold line extending from the fitting step portion toward the second fold line side,
A notch is provided in the second fold line connecting the bottom plate having the fitting step portion and the side plate,
Each of the bending accelerating fold lines is two fold lines extending from the fitting step portion toward the second fold line so as to form a substantially V shape in the bottom plate. A packaging box , which is provided so as to form a substantially isosceles triangle having a bend-promoting fold line as a hypotenuse and the second fold line as a base . Packaging box according to claim 1, characterized in that the said front end-side region than the fitting step portion of the bottom surface for plate having a fitting step portion, the bent guide wire is provided. Packaging box according to claim 1 or 2, wherein the folding line, characterized in that the notch is provided at the intersection. At least one of the deflection promoting folding lines, packaging box according to any one of claims 1 to 3, characterized in that fitting edged write portion of a predetermined length starting from the fitting step section is provided . Wherein the intersection of the said second folding line and the bending facilitating fold line to any one of claims 1 to 4, characterized in that the length of the second fold line is substantially trisected The packaging box described. At least one first bending guide line is provided in a region closer to the front end side than the fitting step portion of the bottom plate in parallel to the second folding line, and when the packaging box is assembled, The packaging box according to any one of claims 1 to 5 , wherein a leading end side of the bottom plate is bent and guided downward from the packaging box. The bottom plate is provided with at least one second bending guide line that is non-parallel to the second fold line, and one end of the second bending guide line is located on the tip side of the fitting step portion. , The other end is provided on at least a part of a straight line extending in a direction not intersecting with the bending promoting fold line, and when the packaging box is assembled, the tip side is more than the second bending guide line of the bottom plate. The packaging box according to claim 6 , wherein the packaging box is bent and guided downward. When the packaging box is assembled, the first and second bending guides of the bottom plate are provided in parallel with the bottom plate so that the plurality of first and second bending guide lines do not cross each other. The packaging box according to claim 7 , wherein a leading end side is bent and guided in an arc shape downward from the portion where the line is provided. The first and second bending guide wires are provided by making a cut in the depth in the middle of the thickness direction in the plate surface of the bottom plate facing the box when the packaging box is assembled. The packaging box according to claim 7 or 8 , characterized in that. The blank is
Having four said side plates,
As the side plate, the first end plate, the first side plate, the second end plate and the second side plate are sequentially connected,
As the bottom plate, first and second bottom plate flaps are respectively provided at lower edges of the first and second side plates via the second fold line, and each of the first and second end plates The lower edge is provided with first and second bottom plate auxiliary pieces through the second fold line,
The fitting step portion is formed on the tip side of each bottom plate flap,
A bottom surface is formed by folding the blank along each fold line and fitting the fitting step portions of the bottom plate flaps to each other, and connecting the first end plate and the second side plate to form a rectangular parallelepiped or The packaging box according to any one of claims 1 to 9 , wherein the packaging box is assembled in a cubic shape. The blank for folding and shape | molding the packaging box of any one of Claim 1 to 10 .

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