JP7102264B2 - Packaging box - Google Patents

Description

The present invention relates to a packaging box.

Patent Document 1 discloses an A-type packaging box in which a part of the upper outer flap and the front surface can be removed for display at a store or the like. In this packaging box, after cutting the upper outer flap with an opening cutting line, the entire front surface was removed by cutting along a pair of vertical cutting lines formed at the boundary between the front surface and the pair of side surfaces.

Further, Patent Document 2 discloses an A-type packaging box in which a broken portion is provided on a side wall and a part is broken in a sealed state so that the inside can be exposed. The break was partitioned by a cutting line extending along the boundary between the side wall and the upper outer flap and a pair of breaking lines extending from both ends of the cutting line to the bottom wall. The pair of break lines extended in a straight line at a position separated inward from the boundary line between the side wall and the pair of end walls, and were inclined so as to approach each other from the upper side to the lower side.

Japanese Unexamined Patent Publication No. 2017-137117 Japanese Unexamined Patent Publication No. 2008-1626559

By the way, when a plurality of A-type packaging boxes are stacked, the lower packaging box receives most of the compressive load at its corners. In the packaging box described in Patent Document 1, since a pair of vertical cutting lines are formed at the boundary between the front surface and the pair of side surfaces, the strength of the corner portion of the packaging box is significantly reduced. Therefore, in the packaging box described in Patent Document 1, the load-bearing performance is significantly lowered, and there is a possibility that a plurality of packaging boxes cannot be stacked.

On the other hand, in the packaging box described in Patent Document 2, since the pair of break lines are located inside from the vertical boundary line, the left and right sides of the side wall are left, and the corner portion of the packaging box is left. Was able to keep the strength of. However, the packaging box described in Patent Document 2 has another problem that it is difficult to take out the article because the left and right sides of the remaining side wall are obstructive when taking out the article contained in the packaging box.

For this other problem, it is conceivable to cut the left and right sides of the remaining side wall along the boundary line with the flaps on both the upper and lower sides. However, since the angle formed by the boundary line between the side wall and the lower outer flap and each breaking line is an obtuse angle, the force for cutting the left and right sides of the side wall is not concentrated on the boundary line with the lower outer flap, and the side wall Very large force was required to cut both the left and right sides. Therefore, it was difficult to cut the left and right sides of the remaining side wall. In addition, the left and right sides of the side wall may be torn at a position deviated from the boundary line between the side wall and the lower outer flap.

In order to solve the above problems, the present invention provides a packaging box in which a contained article can be easily taken out while maintaining a high load-bearing performance.

In order to achieve the above object, the packaging box of the present invention has a peripheral wall formed in a tubular shape by a plurality of wall bodies connected via a first folding curve, and a second folding curve at one end of the peripheral wall. A first flap that is connected to the other end of the peripheral wall and closes one end surface of the peripheral wall, and a second flap that is connected to the other end of the peripheral wall via a third folding curve and closes the other end surface of the peripheral wall. At least one of the plurality of wall bodies is formed at a position away from the first folding curve, and is separated from the first folding curve between the second folding curve and the third folding curve. The wall body is provided with a cutting line formed in a convex shape in the direction and having an angle formed by the second folding curve and an angle formed by the third folding curve as a sharp angle, and the wall body is formed by the cutting line. After being cut, it is cut toward the first fold curve along the second fold curve and the third fold curve.

In this case, the cutting line is a first inclined line extending diagonally from the apex of the convex shape toward the first flap and a second inclined line extending obliquely from the apex toward the second flap. It is preferable that the second folding curve is formed in a range intersecting the first inclined line, and the third folding curve is formed in a range intersecting with the second inclined line.

In other cases, the cutting line is a first inclined line extending diagonally from the convex apex toward the first flap and a second inclined extending obliquely from the apex toward the second flap. A state in which the formation position of the cutting line on the wall body is fixed, and the formation position of the second folding curve is changed within a range intersecting the first inclined line, and the second inclined line is included. It is preferable that the distance from one end surface to the other end surface of the peripheral wall is changed by setting at least one of the states in which the formation position of the third folding curve is changed within the range intersecting with.

In this case, the intersection of the first inclined line and the second folding curve is deviated from the intersection of the second inclined line and the third folding curve in a direction closer to or away from the first folding curve. Is preferable.

In this case, a pair of the cutting lines are symmetrically formed on the wall body at positions separated inward from the first folding curve on both sides, and at least one of the first flap and the second flap has a pair of cutting lines. It is preferable that an opening line is formed so as to connect the pair of cutting lines, and at least one of the first flap and the second flap is cut along the opening line.

In this case, a pair of the cutting lines are symmetrically formed on the wall body at positions separated inward from the first folding curve on both sides, and at least one of the second folding curve and the third folding curve is formed. , It is preferable that the sewing machine line is formed by arranging a plurality of cuts at predetermined intervals.

In this case, it is preferable that two sets of the pair of cutting lines are formed on the pair of wall bodies facing each other on the peripheral wall.

According to the present invention, the contained article can be easily taken out while maintaining a high load-bearing performance of the packaging box.

It is a perspective view which shows the packaging box which concerns on 1st Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on 1st Embodiment of this invention. It is a top view which shows the part of the blank of the packaging box which concerns on 1st Embodiment of this invention in an enlarged manner. It is a perspective view which shows the state which opened the packaging box which concerns on 1st Embodiment of this invention. It is a front view which shows the state which opened the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view which shows the state which the side wall of the packaging box which concerns on 1st Embodiment of this invention is fully opened. It is a perspective view which shows the state which the pair of side walls of the packaging box which concerns on 1st Embodiment of this invention are fully opened. It is a perspective view which shows the folded state of the packaging box which concerns on 1st Embodiment of this invention. It is a part of the blank of the packaging box which concerns on 1st Embodiment of this invention, and is the top view explaining that the formation position of the 2nd folding curve and the 3rd folding curve is changed. It is a top view which shows the blank of the packaging box which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the state which opened the packaging box which concerns on 2nd Embodiment of this invention. It is an enlarged plan view which shows a part of the blank of the packaging box which concerns on 1st modification of 1st Embodiment of this invention. It is a perspective view which shows the state which opened the packaging box which concerns on 2nd modification of 1st Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on 3rd modification of 1st Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawing, "Fr" indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates "U". "Upper" and "D" indicate "lower". The front-back direction is orthogonal to the left-right direction, and the up-down direction is orthogonal to the front-back direction and the left-right direction. Although terms indicating directions and positions are used in the present specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[First Embodiment: Outline of packaging box]
The configuration of the packaging box 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a packaging box 1. FIG. 2 is a plan view showing a blank 5 of the packaging box 1. FIG. 3 is an enlarged plan view showing a part of the blank 5.

As shown in FIG. 1, the packaging box 1 is formed in a substantially rectangular cuboid shape that is long in the left-right direction and low in the up-down direction. The packaging box 1 is a type A box that is sealed by closing the upper end surface and the lower end surface of the substantially square cylindrical peripheral wall 1W. A plurality of articles (not shown) are housed inside the packaging box 1.

The packaging box 1 is formed by assembling the blank 5 shown in FIG. The blank 5 is formed by punching, for example, a sheet of paper corrugated cardboard sheet by punching or the like. The corrugated cardboard sheet is, for example, a double-sided corrugated cardboard sheet in which a front liner 9B and a back liner 9C (see FIG. 4) are bonded to the front and back surfaces of a wavy corrugated cardboard 9A. Note that FIG. 2 shows the front liner 9B side (outer surface side of the packaging box 1). In the present specification, the direction parallel to the corrugated cardboard inner shin 9A is referred to as the "step direction", and the direction orthogonal to the step direction (middle shin 9A) is referred to as the "flow direction". “X” shown in the drawing indicates “step direction”, and “Y” indicates “flow direction”. Further, in the present specification, the terms "top (heaven)", "bottom (bottom)" and similar terms are used as the top (top), bottom (bottom) and the like in the assembled state (assembled state) of the packaging box 1. Refers to a concept similar to.

[blank]
As shown in FIG. 2, the blank 5 includes a pair of end walls 10, a pair of side walls 11, a joint piece 12, a pair of upper inner flaps 13 (first flaps), and a pair of upper outer flaps 14 (1st flaps). A first flap), a pair of lower inner flaps 15 (second flaps), and a pair of lower outer flaps 16 (second flaps).

<End wall, side wall>
The pair of end walls 10 and the pair of side walls 11 are alternately connected with each other via the first folding curve L1. The end wall 10 is formed in a substantially rectangular shape wider in the flow direction than the side wall 11. The joint piece 12 is continuously provided at the end of the side wall 11 located on one side in the flow direction via the first folding curve L1.

<Upper inner flap, upper outer flap>
The pair of upper inner flaps 13 are connected to one end of the pair of end walls 10 in the step direction (the upper end of the peripheral wall 1W) via the second folding curve L2. The upper inner flap 13 is formed in a substantially rectangular shape having substantially the same width as the dimension of the end wall 10 in the flow direction. The dimension (extended dimension) of the upper inner flap 13 in the step direction is set to be substantially half of the dimension of the end wall 10 in the flow direction. The pair of upper and outer flaps 14 are connected to one end (upper end) of the pair of side walls 11 in the step direction via the second folding curve L2. The upper outer flap 14 is formed in a substantially rectangular shape having substantially the same width as the dimension of the side wall 11 in the flow direction. The dimension (extension dimension) of the upper outer flap 14 in the step direction is substantially the same as the extension dimension of the upper inner flap 13.

<Lower inner flap, lower outer flap>
The pair of lower inner flaps 15 are continuously provided at the other end of the pair of end walls 10 in the step direction (the lower end of the peripheral wall 1W) via the third folding curve L3. The pair of lower outer flaps 16 are connected to the other end (lower end) of the pair of side walls 11 in the step direction via the third folding curve L3. The lower inner flap 15 is formed in substantially the same shape as the upper inner flap 13, and the lower outer flap 16 is formed in substantially the same shape as the upper outer flap 14.

The first to third folding curves L1 to L3 are general-purpose ruled lines obtained by crushing a corrugated cardboard sheet linearly in the thickness direction from the back liner 9C side. The general-purpose ruled line has a function of bending the corrugated cardboard sheet so that the back liner 9C faces inward. The second folding curve L2 and the third folding curve L3 extend in the flow direction and are formed parallel to each other. The first folding curve L1 extends in the step direction and is orthogonal to the second and third folding curves L2 and L3. The types of the first to third folding curves L1 to L3 described above are examples, and are not limited to general-purpose ruled lines, and are used for bending a corrugated cardboard sheet such as a lead ruled line in which a plurality of cuts are formed at predetermined intervals on the general-purpose ruled line. Any line can be used.

<Opening structure>
As shown in FIG. 2, the blank 5 is formed with a pair of opening structures 17 for easily opening the sealed packaging box 1. Each of the pair of opening structures 17 is formed from the upper outer flap 14 to the side wall 11. Since the pair of opening structures 17 have the same structure, one opening structure 17 will be described below.

As shown in FIGS. 2 and 3, the opening structure 17 includes a pair of cutting lines 20 and an opening line 30.

<Cut line>
The pair of cutting lines 20 are formed at positions separated inward from the first folding curve L1 on both sides of the side wall 11 in the flow direction. The cutting line 20 is a zipper in which a plurality of substantially S-shaped curved cuts 20A are arranged at predetermined intervals. The cutting line 20 has a function of cutting (dividing) the side wall 11 from the upper outer flap 14 side toward the lower outer flap 16 side. Each cut 20A of the cutting line 20 may be formed in a substantially L shape.

Further, each cutting line 20 is formed in a convex shape between the second folding curve L2 and the third folding curve L3 in a direction away from the first folding curve L1. That is, the pair of cutting lines 20 are formed in a substantially triangular shape (mountain shape) protruding inward from each other. Further, the pair of cutting lines 20 are formed so as to be symmetrical in the flow direction (a shape that overlaps with each other when folded back at the center of the flow direction).

More specifically, as shown in FIG. 3, each cutting line 20 is bent with the vicinity of the center of the side wall 11 in the step direction as the apex V. Each of the cutting lines 20 has a first inclined line 21 extending diagonally outward from the convex apex V toward the upper outer flap 14, and a first inclined line 21 extending diagonally outward from the apex V toward the lower outer flap 16. 2 Inclined lines 22 and are included.

The portion where the first inclined line 21 and the second inclined line 22 intersect is the apex portion V. Further, the tip end (upper end) of the first inclined line 21 is in contact with (intersects) the second folding curve L2, and the tip (lower end) of the second inclined line 22 is in contact with the third folding curve L3 (the lower end). Crossing). In other words, the second folding curve L2 is formed in a range intersecting the first inclined line 21, and the third folding curve L3 is formed in a range intersecting the second inclined line 22. The intersection P1 of the first inclined line 21 and the second folding curve L2 is at substantially the same position in the flow direction as the intersection P2 of the second inclined line 22 and the third folding curve L2. That is, the shortest distance from the first folding curve L1 to the intersection P1 is substantially the same as the shortest distance from the first folding curve L1 to the intersection P2.

Since the first inclined line 21 is tilted outward from the apex V toward the second folding curve L2, the angle α formed by the first inclined line 21 and the second folding curve L2 is an acute angle. Similarly, since the second inclined line 22 is tilted outward from the apex V toward the third folding curve L3, the angle β formed by the second inclined line 22 and the third folding curve L3 is an acute angle. .. Further, since the first inclined line 21 and the second inclined line 22 form the apex portion V near the center of the side wall 11 in the step direction, and the intersection P1 and the intersection P2 are at substantially the same position in the flow direction, the angles are angled. α and the angle β are substantially the same angle. Specifically, the angle α and the angle β are approximately 64 degrees.

The angle α and the angle β may be an acute angle, and may be set in a range of 1 degree or more and less than 90 degrees, for example. Further, the angle α and the angle β are preferably set in a range of 30 degrees or more and 70 degrees or less.

In the description of the cutting line 20 (first and second inclined lines 21 and 22) and the opening line 30 described later in the present specification, the expression "crossing (contacting)" or a similar expression is not necessarily the cutting line 20. It is not required that the cuts 20A of the above or the cuts 20A intersect (contact) each of the folding curves L2 and L3. As shown by the alternate long and short dash line in FIG. 3, it means that the virtual straight lines along the line of the plurality of cuts 20A or the virtual straight lines intersect (contact) each of the folding curves L2 and L3. In other words, it means that the edge portion (contour line) when the side wall 11 is cut along the cutting line 20 intersects the folding curves L2, L3, and the like.

<Opening line>
As shown in FIG. 3, the opening line 30 is formed so as to connect a pair of cutting lines 20 at the upper outer flap 14. The opening line 30 is formed in a convex shape toward the tip of the upper and outer flaps 14 by connecting (crossing) both ends thereof to the tips of a pair of first inclined lines 21 in contact with the first folding curve L1. .. The opening wire 30 has a complicatedly curved shape. The opening lines 30 include a plurality of substantially linear first cuts 30A arranged at predetermined intervals in the central region in the flow direction, and a plurality of substantially linear first cuts 30A arranged at predetermined intervals on both outer sides from both ends of the first cut 30A in the flow direction. It is a zipper including a substantially L-shaped second cut 30B. The opening wire 30 has a function of cutting the upper and outer flaps 14 from the central portion in the flow direction toward both outer sides. The opening lines 30 may be all formed at the first cut 30A or all may be formed at the second cut 30B. Further, each second cut 30B of the opening line 30 may be formed in a substantially S shape.

Further, the upper outer flap 14 is formed with a pair of opening start lines 31 bifurcated from both ends of the plurality of first cuts 30A. Further, an opening fold curve L4 (general-purpose ruled line) is formed on the upper outer flap 14 so as to connect a pair of opening start lines 31. The area surrounded by the plurality of first cuts 30A, the pair of opening start lines 31 and the opening folding curve L4 is configured with an opening start portion 32 for the user to push a finger when opening the packaging box 1. ..

[Manufacturing method of packaging box]
Here, the manufacturing method of the packaging box 1 will be briefly described. The corrugated cardboard sheet used as a material for the packaging box 1 is manufactured by performing a laminating step of corrugated cardboard base paper using a device called a corrugated board (not shown). The corrugator attaches the liners 9B and 9C to both sides of the inner shin 9A while advancing the middle shin 9A in the flow direction. Further, the corrugated board forms the second folding curve L2 and the third folding curve L3 while advancing the corrugated cardboard sheet in the flow direction, and cuts the corrugated cardboard sheet continuous in the flow direction to a predetermined length.

The blank 5 (packaging box 1) is manufactured by processing a corrugated cardboard sheet that has been cut using a device called a flexofolder gluer (not shown). Flexo Folder Gurua (hereinafter, also referred to as "FFG") is used for printing with flexo ink, scoring with cutting tools (cutting blades, push blades, etc.) and punching dies, grooving and punching, and bonding to corrugated cardboard sheets. It is a device that continuously performs bonding and the like using an agent. The FFG uses a die to form a first folding curve L1, a cutting line 20, an opening line 30, an opening start line 31, and an opening folding curve L4. Further, the FFG performs grooving and the like forming the passage piece 12 and the flaps 13 to 16 of each. Further, in the FFG, after performing ruled line cutting, grooving, etc., the end wall 10 and the side wall 11 are bent along the first folding curve L1, and the joint piece 12 is adhered to the inner surface of the end wall 10 with an adhesive. , Manufacture the folded packaging box 1. As the adhesive, for example, a hot melt adhesive, a synthetic resin emulsion adhesive, a double-sided tape, or the like can be used.

[Assembly of packaging box]
Next, a process (assembly work) for assembling the packaging box 1 and the like will be described with reference to FIG.
The packaging box 1 may be manually assembled by an operator, or may be automatically or semi-automatically assembled by a box making machine. Here, as an example, a case where an operator assembles the packaging box 1 will be described.

First, the operator bends the pair of end walls 10 and the pair of side walls 11 at substantially right angles along the first folding curve L1. A substantially square cylindrical peripheral wall 1W is formed by the pair of end walls 10 and the pair of side walls 11 which are continuously provided via the first folding curve L1. Next, the operator bends the pair of lower inner flaps 15 inside the peripheral wall 1W along the third folding curve L3, and then bends the pair of lower outer flaps 16 inside the peripheral wall 1W along the third folding curve L3. Further, the operator attaches an adhesive tape (not shown) to the tips of the pair of lower outer flaps 16 that are butted against each other. As described above, the lower inner flap 15 and the lower outer flap 16 are in a state where the lower end surface of the peripheral wall 1W is closed, and the bottom surface of the packaging box 1 is formed.

Next, the operator inserts a plurality of articles from the upper end surface of the peripheral wall 1W into the inside (on the bottom surface). Subsequently, the operator bends the pair of upper inner flaps 13 inside the peripheral wall 1W along the second folding curve L2, and then bends the pair of upper outer flaps 14 inside the peripheral wall 1W along the second folding curve L2. The operator attaches an adhesive tape (not shown) to the tips of the pair of upper and outer flaps 14 that are butted against each other. As a result, the upper inner flap 13 and the upper outer flap 14 are in a state where the upper end surface of the peripheral wall 1W is closed, and the top surface of the packaging box 1 is formed.

As a result, the assembly work of the packaging box 1 is completed, and the packaging box 1 is in a sealed state (see FIG. 1). A plurality of sealed packaging boxes 1 are stored or transported in a stacked state. The outer flaps 14 and 16 were fixed with adhesive tape, but instead, they may be adhered to the inner flaps 13 and 15 with an adhesive.

[Opening the packaging box]
Next, the opening operation of the packaging box 1 will be described with reference to FIGS. 4 to 6. FIG. 4 is a perspective view showing a state in which the packaging box 1 is opened. FIG. 5 is a front view showing a state in which the packaging box 1 is opened. FIG. 6 is a perspective view showing a state in which the side wall 11 of the packaging box 1 is fully opened.

As shown in FIG. 4, the packaging box 1 is opened by cutting the upper outer flap 14 of any one of the pair of upper outer flaps 14 and the side wall 11 connected to the upper outer flap 14.

First, the user pushes the opening start portion 32 by hand (finger), cuts the opening start portion 32 at the first cut 30A and the pair of opening start lines 31, and bends the opening start portion 32 inward along the opening folding curve L4. The user grips the edge of the upper outer flap 14 cut at the first cut 30A by the hand pushing the opening start portion 32, and pulls up the upper outer flap 14. Then, the upper outer flap 14 is cut along the opening line 30 (plurality of second cuts 30B).

The user pulls down the side wall 11 together with the upper outer flap 14 while holding the cut upper outer flap 14. Then, the side wall 11 is cut along the pair of cutting lines 20. As a result, the opening 1A is formed from the upper outer flap 14 to the side wall 11. In this state, the packaging box 1 is opened, and the user can put his / her hand into the packaging box 1 through the opening 1A and take out the article. The side wall 11 cut by the pair of cutting lines 20 falls outward (front side) and extends outward (front) from the lower outer flap 16.

As described above, in the state where the packaging box 1 is opened, since the pair of cutting lines 20 are located inside from the left and right ends of the side wall 11, the side walls 11 located on both the left and right sides of the pair of cutting lines 20 are located. It will remain (see Figure 4). In the present specification, the left and right sides of the side wall 11 remaining after cutting the side wall 11 along the pair of cutting lines 20 are referred to as "sleeve wall 11A".

By the way, there is a demand that all the articles contained in the packaging box 1 be moved to the exhibition space at once. As a method of satisfying this requirement, for example, it is conceivable to tilt the packaging box 1 with the opening 1A facing downward and slide (or roll down) the article in the packaging box 1. However, since a pair of sleeve walls 11A are left on both the left and right sides of the opening 1A, the article may be caught by the sleeve wall 11A and the article may not be smoothly moved to the exhibition space. Therefore, in the packaging box 1 according to the first embodiment, the side wall 11 is cut along the second folding curve L2 and the third folding curve L3 toward the first folding curve L1 after being cut by the cutting line 20. ..

Specifically, as shown in FIG. 5, the user puts his / her hand in the opening 1A, grasps the sleeve wall 11A, and pulls it outward (see the white arrow). Since the angle α formed by the second folding curve L2 and the angle β formed by the third folding curve L3 are acute angles in the cutting line 20, the force for pulling the sleeve wall 11A outward is the first inclined line 21 and the first inclined line 20. It will be concentrated at the intersection P1 with the two-fold curve L2 and the intersection P2 with the second acute angle 22 and the third fold curve L3. Since the second and third folding curves L2 and L3 are weakened in rigidity by crushing the corrugated cardboard sheet, the sleeve wall 11A has the second and third folding curves L2 and L3 due to the force concentrated on the respective intersections P1 and P2. Will tear along (see FIG. 6).

As shown in FIG. 6, the user pulls the sleeve wall 11A until the crevice along the second and third fold curves L2 and L3 reaches the first fold curve L1, and the sleeve wall 11A is moved to the upper outer flap 14 and the lower outer side. Separate from flap 16. As a result, substantially the entire surface of the side wall 11 is opened. The sleeve wall 11A is continuously provided to the end wall 10 via the first folding curve L1.

Then, the user arranges the opening 1A on the exhibition space and tilts the packaging box 1 so that the opening 1A faces downward. The articles in the packaging box 1 are placed on the bottom surface (lower inner flap 15, lower outer flap 16), on the side wall 11 cut by the pair of cutting lines 20, and on the upper outer flap 14 cut by the opening line 30. Sliding (or rolling), moving onto the exhibition space.

[Disposal of packaging box]
Next, the disposal work of the packaging box 1 will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view showing a state in which the pair of side walls 11 are fully opened. FIG. 8 is a perspective view showing a folded state of the packaging box 1.

As shown in FIG. 7, the user cuts the upper outer flap 14 that was not cut when the packaging box 1 was opened by the opening line 30, and the side wall 11 connected to the upper outer flap 14 is cut by a pair of cutting lines 20. Disconnect. The user also cuts the pair of sleeve walls 11A along the second and third folding curves L2 and L3. That is, the pair of side walls 11 facing each other on the peripheral wall 1W are fully opened.

Next, as shown in FIG. 8, the user tilts the pair of end walls 10 in the same direction about the third folding curve L3. When the user tilts each end wall 10 by approximately 90 degrees, each upper outer flap 14 or the like overlaps the lower outer flap 16 or the like. That is, the top surface and the bottom surface of the packaging box 1 are overlapped with each other, and the packaging box 1 is folded flat. In this way, the folded packaging boxes 1 are stacked and stored, and are periodically collected.

According to the packaging box 1 according to the first embodiment described above, since the pair of cutting lines 20 are formed at positions inside from both ends of the side wall 11 (see FIG. 1), they are on the first folding curve L1. It is possible to prevent the strength of the corner portion of the packaging box 1 from being lowered as compared with the case where the cutting line 20 is formed in the packaging box 1. As a result, the load-bearing performance of the packaging box 1 can be maintained high.

Further, in this packaging box 1, the angle α formed by the cutting line 20 and the second folding curve L2 and the angle β formed by the cutting line 20 and the third folding curve L3 are set to be acute angles (see FIG. 3). .. According to this configuration, the force for pulling the sleeve walls 11A left on both sides of the side wall 11 to the outside can be concentrated at the intersections P1 and P2 where the cutting line 20 and the folding curves L2 and L3 form an acute angle. As a result, the sleeve wall 11A can be cut with a small force along the folding curves L2 and L3. As a result, the entire surface of the side wall 11 can be opened, and the article contained in the packaging box 1 can be easily taken out.

Further, in the packaging box 1 according to the first embodiment, as shown by the broken line in FIG. 9, the second folding curve L2 is formed in a range (R1) intersecting the first inclined line 21, and the third folding curve L3. Was formed in the range (R2) intersecting the second inclined line 22. According to this configuration, as shown by the alternate long and short dash line in FIG. 9, even if the formation position of the second folding curve L2 is changed within the range (R1) intersecting the first inclined line 21, the second folding curve L2 The angle α formed by the first inclined line 21 can be made an acute angle. Similarly, even if the formation position of the third folding curve L3 is changed within the range (R2) where the second inclined line 22 intersects, the angle β formed by the third folding curve L3 and the second inclined line 22 is an acute angle. Can be. As a result, the distance between the second folding curve L2 and the third folding curve L3, that is, the height of the peripheral wall 1W (packaging box 1) is set within the range where the cutting line 20 and the folding curves L2 and L3 form an acute angle. Can be changed.

Further, in the packaging box 1 according to the first embodiment, the forming position of the cutting line 20 on the side wall 11 is fixed, and the forming position of the second folding curve L2 is changed within the range R1 intersecting the first inclined line 21. The height of the peripheral wall 1W (from one end surface to the other end surface) is set to at least one of the state and the state in which the formation position of the third folding curve L3 is changed within the range R2 where the second inclined line 22 intersects. Distance) will be changed. That is, even if the formation positions of the second and third folding curves L2 and L3 are changed during the manufacture of the corrugated cardboard sheet, as long as the positions are changed within a range that can intersect the first and second inclined lines 21 and 22. There is no need to change the design of the die used in FFG. That is, it is possible to manufacture a plurality of types of packaging boxes 1 having different heights by one die. As a result, it is possible to manufacture a plurality of types of packaging boxes 1 having different heights at low cost.

Further, according to the packaging box 1 according to the first embodiment, when the package is opened, a large opening 1A is formed from the upper outer flap 14 to the side wall 11 (see FIG. 4), so that the article housed in the packaging box 1 is formed. Can be taken out smoothly.

Further, according to the packaging box 1 according to the first embodiment, since the two sets of the pair of cutting lines 20 are formed on the pair of side walls 11 facing each other on the peripheral wall 1W, the entire surface of each side wall 11 is opened. Can be done (see FIG. 7). Thereby, the work of folding the packaging box 1 flat can be easily performed by tilting the pair of end walls 10 after taking out the article (see FIG. 8). In addition, the folded packaging boxes 1 can be stored and collected in a stacked state, and the storage and collection place can be saved in space.

In the packaging box 1 according to the first embodiment, the opening line 30 is formed on the upper outer flap 14, but instead of / in addition to this, the opening line 30 may be formed on the lower outer flap 16. .. In this case, the cutting line 20 is preferably configured to cut the side wall 11 from the bottom to the top, or to cut the side wall 11 from both the upper and lower sides toward the center.

[Second Embodiment]
Next, the packaging box 2 according to the second embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a plan view showing a blank 6 of the packaging box 2. FIG. 11 is a perspective view showing a state in which the packaging box 2 is opened. In the following description, the same or corresponding configurations as the packaging box 1 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 10, in the packaging box 2 (blank 6, opening structure 18) according to the second embodiment, there are a plurality of second folding curves L20 located at the boundary between the upper end portion of the peripheral wall 2W and the flaps 13 and 14. It is a sewing machine line formed by arranging the cuts 23A of the above at predetermined intervals. The second folding curve L20 is also formed while advancing the corrugated cardboard sheet in the flow direction during the production of the corrugated cardboard sheet by the corrugated board.

Further, in the opening structure 18 of the packaging box 2 (blank 6) according to the second embodiment, the opening line 30 is omitted, and a plurality of cuts 33A are arranged side by side in the central portion of the upper outer flap 14 in the flow direction. An opening start line 33 forming an outline of the shape is formed. Both ends of the opening start line 33 are in contact with the second folding curve L20, and the opening starting portion 34 is formed in a substantially trapezoidal region surrounded by the second folding curve L20 and the opening start line 33.

When opening the packaging box 2, as shown in FIG. 11, the user pushes the opening start portion 34 by hand (finger), cuts the packaging box 2 along the opening start line 33, and bends the packaging box 2 inward along the second folding curve L20. The user grasps the upper edge portion of the side wall 11 with the hand pushing the opening start portion 34, pulls down the side wall 11, and cuts the side wall 11 along the pair of cutting lines 20. As a result, the packaging box 2 is opened.

Next, the user grips the sleeve wall 11A and pulls it outward, and cuts the sleeve wall 11A along the second folding curve L20 and the third folding curve L3. As a result, the opening 2A in which the side wall 11 is fully opened is formed.

According to the packaging box 2 according to the second embodiment described above, the same actions and effects as those of the packaging box 1 according to the first embodiment can be obtained. Further, according to the packaging box 2 according to the second embodiment, since the second folding curve L20 is a sewing machine line (sewing machine blade), the sleeve wall 11A is cut with a light force as compared with the case where it is a general-purpose ruled line. Can be done.

In the packaging box 2 according to the second embodiment described above, the second folding curve L20 located at the boundary between the upper end portion of the peripheral wall 2W and the flaps 13 and 14 is a sewing machine wire. Not limited to. For example, the third folding curve located at the boundary between the lower end of the peripheral wall 2W and the flaps 15 and 16 may be a sewing machine line (not shown), or both the second folding curve L20 and the third folding curve. May be a sewing machine line (not shown). Further, although the opening start line 33 was formed on the upper outer flap 14, instead of / in addition to this, the opening start line 33 may be formed on the lower outer flap 16.

[First modification]
In the packaging boxes 1 and 2 according to the first and second embodiments, the intersection P1 between the first inclined line 21 and the second folding curve L2 and L20, and the second inclined line 22 and the third folding curve L3. The intersection P2 is provided so that the distances to the first folding curve L are substantially equal, but the present invention is not limited to this. For example, as shown in FIG. 12, the intersection P1 between the first inclined line 21 and the second folding curve L2 is closer to the first folding curve L1 than the intersection P2 between the second inclined line 22 and the third folding curve L3. It may be deviated in the direction (second modification). In this case, the angle α and the angle β are different angles (α <β). Although the blank 5 according to the first embodiment is shown in FIG. 12, in the blank 6 according to the second embodiment, the intersection P1 between the first inclined line 21 and the second folding curve L20 is the second more than the intersection P2. It may be deviated to the L1 side of the one-fold curve (not shown).

In the packaging boxes 1 and 2 according to the first modification described above, the intersection P2 between the second inclined line 22 and the third folding curve L3 is the intersection P1 between the first inclined line 21 and the second folding curves L2 and L20. Since it is located inside, the force that pulls the sleeve wall 11A outward acts on the intersection P2 and then on the intersection P1. According to this configuration, the sleeve wall 11A starts to tear along the third folding curve L3 and then starts to tear along the second folding curves L2 and L20. Therefore, when the two folding curves L2, L20 and L3 start to split at the same time. The sleeve wall 11A can be cut with a small force. Not limited to the above, the intersection P1 between the first inclined line 21 and the second folding curve L2 and L20 is farther from the first folding curve L1 than the intersection P2 between the second inclined line 22 and the third folding curve L3. It may be offset in the direction. That is, the angle α may be larger than the angle β (α> β).

[Second modification]
Further, in the packaging boxes 1 and 2 according to the first and second embodiments (including the first modification), a pair of cutting lines 20 are formed on the respective side walls 11, but the present invention is limited to this. Not done. As shown in FIG. 13, in the packaging box 3 (peripheral wall 3W) according to the second modification, one cutting line 20 is formed on each side wall 11. In this case, the user cuts the side wall 11 along the cutting line 20 and cuts the sleeve wall 11A along the two folding curves L2, L20, and L3. As described above, a part of the side wall 11 (sleeve wall 11A) is opened to form the opening 3A, and the user can take out the articles housed in the packaging boxes 1 and 2 one by one from the opening 3A. Further, after taking out the required amount of the article, the opened sleeve wall 11A can be closed again to easily reseal.

[Third variant]
Further, in the packaging boxes 1 to 3 according to the first and second embodiments (including the first and second modifications), the cutting line 20 is bent in a substantially L-shape (substantially V-shape). , The present invention is not limited to this. For example, as shown in FIG. 14, the cutting line 20 may be formed in a substantially U shape. That is, the connecting portion between the first inclined line 21 and the second inclined line 22 may be curved.

In the packaging boxes 1 to 3 according to the first and second embodiments (including the first to third modified examples, the same applies hereinafter), two pairs of cutting lines 20 (two sets in the second modified example) are used. One cutting line 20) was formed on the pair of side walls 11, but the present invention is not limited to this. A pair of cutting lines 20 may be formed on one side wall 11 or one cutting line 20 may be formed on one side wall 11 (neither is shown).

Further, in the packaging boxes 1 to 3 according to the first and second embodiments, the cutting line 20 is formed on a pair of side walls 11 forming facing surfaces of the peripheral walls 1W and 2W, but the present invention is not limited thereto. .. For example, the cutting line 20 may be formed on at least one of the pair of end walls 10 instead of the side wall 11 (not shown). In this case, it is preferable that the opening line 30, the opening start line 33, and the like are formed not only on the upper outer flap 14 but also on the upper inner flap 13 (not shown).

Further, in the packaging boxes 1 to 3 according to the first and second embodiments, the apex V of the cutting line 20 is located substantially at the center of the height of the side wall 11, but the present invention is not limited to this. It may be located above or below the center of height (not shown). In this case, the angle α formed by the first inclined line 21 and the second folding curve L2 and L20 and the angle β formed by the second inclined line 22 and the third folding curve L3 may be the same or different. May be good.

Further, in the packaging boxes 1 to 3 according to the first and second embodiments, the cutting line 20 is a so-called zipper, but the cutting line 20 is not limited to this, and the cutting line 20 is for cutting a corrugated cardboard sheet such as a sewing machine line. Any line can be used.

Further, the packaging boxes 1 to 3 according to the first and second embodiments are formed of a double-sided corrugated cardboard sheet made of paper, but the present invention is not limited thereto. For example, the corrugated cardboard sheet may be a single-sided corrugated cardboard sheet in which a liner is attached to one side of the corrugated cardboard 9A, or a double-sided corrugated cardboard sheet in which a single-sided corrugated cardboard sheet is attached to a double-sided corrugated cardboard sheet. Further, for example, the packaging box 1 may be formed of thick paper, a resin plate, or the like instead of the corrugated cardboard sheet made of paper.

The description of the embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1,2,3 Packaging box 1W, 2W, 3W Peripheral wall 10 End wall (wall body)
11 Side wall (wall body)
13 Upper inner flap (1st flap)
14 Upper outer flap (1st flap)
15 Lower inner flap (second flap)
16 Lower outer flap (second flap)
20 Cutting line 21 1st inclined line 22 2nd inclined line 30 Opening line L1 1st folding curve L2, L20 2nd folding curve L3 3rd folding curve P1, P2 intersection V apex

Claims (6)

A peripheral wall (1W, 2W.3W) formed in a cylindrical shape by a plurality of wall bodies (10, 11) serially connected via a first folding curve (L1), and
The first flaps (13, 14), which are connected to one end of the peripheral wall via a second folding curve (L2, L20) and close one end surface of the peripheral wall,
Second flaps (15, 16) that are connected to the other end of the peripheral wall via a third folding curve (L3) and close the other end surface of the peripheral wall.
At least one of the plurality of wall bodies is formed at a position away from the first folding curve, and between the second folding curve and the third folding curve, from the first folding curve. It is provided with a cutting line (20) which is formed in a convex shape toward a distance and has a sharp angle (α) formed with the second folding curve and an angle (β) formed with the third folding curve. ,
The cutting line is
A first inclined line (21) extending diagonally from the convex apex (V) toward the first flap, and
A second inclined line (22) extending obliquely from the apex toward the second flap, and the like.
The intersection (P1) of the first inclined line and the second folding curve is in a direction closer to or away from the first folding curve than the intersection (P2) of the second inclined line and the third folding curve. It is out of alignment
The angle (α) formed by the second folding curve and the angle (β) formed by the third folding curve are different from each other.
A part of the wall body remaining after cutting the wall body with the cutting line is regarded as a sleeve wall (11A).
The intersection (P1) of the first inclined line and the second folding curve is deviated from the intersection (P2) of the second inclined line and the third folding curve in a direction closer to the first folding curve. In the case, the sleeve wall begins to be cut along the third fold curve and then begins to be cut along the second fold curve.
The intersection (P1) of the first inclined line and the second folding curve is deviated from the intersection (P2) of the second inclined line and the third folding curve in a direction away from the first folding curve. In this case, the packaging box is characterized in that the sleeve wall starts to be cut along the second folding curve and then starts to be cut along the third folding curve . The second folding curve is formed in a range intersecting the first inclined line.
The packaging box according to claim 1, wherein the third folding curve is formed in a range intersecting the second inclined line. The formation position of the cutting line in the wall body is fixed, and the formation position of the second folding curve is changed within the range intersecting with the first inclined line and within the range intersecting with the second inclined line. The first aspect of the present invention is characterized in that the distance from one end surface to the other end surface of the peripheral wall is changed by changing the formation position of the third folding curve to at least one of the states. Packaging box. A pair of the cutting lines are symmetrically formed on the wall body at positions separated inward from the first folding curve on both sides.
An opening line (30) is formed on at least one of the first flap and the second flap so as to connect the pair of cutting lines, and at least one of the first flap and the second flap is said to be opened. The packaging box according to any one of claims 1 to 3 , wherein the packaging box is cut along a line. A pair of the cutting lines are symmetrically formed on the wall body at positions separated inward from the first folding curve on both sides.
The invention according to any one of claims 1 to 4 , wherein at least one of the second folding curve (L20) and the third folding curve is a sewing machine line formed by arranging a plurality of cuts at predetermined intervals. Packaging box. The packaging box according to claim 4 or 5 , wherein two sets of the pair of cutting lines are formed on the pair of wall bodies facing each other of the peripheral walls.

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