JP2017077905A - Packing box and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing box and a method of manufacturing the same, capable of suppressing a manufacture cost and a transportation cost while suppressing deviation and opening of a line of juncture of flaps of the packing box.SOLUTION: A packing box includes a trunk part of square tube which surrounds a predetermined space, an edge reinforcing part which reinforces an edge part of an opening of the trunk part, and is connected to an end part on the opening side of the trunk part, being folded over by at least twice inside the edge part of the trunk part, and a plurality of flaps which are bent at a tip end part of the edge reinforcing part for connection, and are divided at a corner part of the opening of the trunk part, for closing the opening of the trunk part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging box and a manufacturing method thereof.

  When wrapping articles in a paper packaging box such as cardboard or cardboard, the packaging box is filled with articles and the top flap of the packaging box is closed and fixed. Misalignment and gaps may occur at the seam. For example, one article is packed in the full capacity of the packaging box, or the capacity of the article is smaller than the capacity of the packaging box, but the quantity of the article is large and difficult to put in line, or the article is elastic, When packing a product that reduces the volume (elastic contraction) of the product and packs the product that increases the volume of the product (elastic expansion) after the product is packed, the opening of the packaging box bends, and when closing the top flap, the opposing top surface A gap may be formed at the joint between the flaps, or the joint between the upper surface flaps facing each other may be displaced due to distortion of the packaging box.

  To prevent gaps and gaps between the upper surface flaps, when fixing the seams between the upper surface flaps with tape, staples, etc. It is necessary to correct and hold the flap in the correct position. Therefore, one worker may need two workers so that one person closes the upper surface flap and another person fixes the joint of the upper surface flap with a tape or the like. In addition, in the case of a single worker, the upper surface flap must be closed neatly because it must be sealed with tape, staples, etc. while holding it so that there are no gaps or gaps between the upper surface flaps with feet or knees. I couldn't do it or had to start over.

  As a technique for preventing misalignment and gaps between the upper surface flaps of the packaging box, Patent Document 1 has a rectangular cylindrical body filled with contents, and the outer periphery of the upper and lower openings of the rectangular cylindrical body. There is disclosed a cardboard box for preventing swelling which is provided with a swelling prevention band formed by folding upper and lower flaps outward in a substantially U-shape on the surface.

Japanese Patent Laid-Open No. 62-251338

  The following analysis is given by the inventor.

  The cardboard box for preventing swelling of Patent Document 1 is an inner box housed in an outer box and does not have a lid. In other words, in the configuration like the cardboard box for preventing swelling of Patent Document 1, it must be a double configuration of the outer box and the inner box, and the manufacturing cost for the addition of the inner box as the whole packaging box Will increase. Moreover, since the upper and lower flaps are folded back outward in a substantially U shape, the upper and lower flaps of the corrugated cardboard box for preventing swelling of Patent Document 1 have a large bulge outward, and the size of the outer box with respect to the article. Alternatively, the volume must be increased as compared with the case where there is no cardboard box for preventing swelling, and there is a possibility that the transportation cost increases.

  The main subject of this invention is providing the packaging box which can suppress manufacturing cost and conveyance cost, and its manufacturing method, suppressing the shift | offset | difference and opening of the joint of the flap of a packaging box.

  The packaging box according to the first aspect is connected to the opening-side end portion of the trunk portion, while reinforcing a rectangular tube-shaped trunk portion surrounding a predetermined space, and an edge of the opening of the trunk portion, In addition, the edge reinforcing portion that is folded twice or more inside the edge portion of the trunk portion is connected to bend at the front end portion of the edge reinforcing portion, and is divided at the corner of the opening of the trunk portion. And a plurality of flaps for closing the opening of the body portion.

  In the method for manufacturing a packaging box according to a second aspect, the sheet member is cut into a developed form of a packaging box in which a plurality of flaps are connected to the end portion of the trunk portion via an edge reinforcing portion; Forming a crease parallel to each other in a connecting portion between the edge reinforcing portion and the edge reinforcing portion, a connecting portion between the edge reinforcing portion and the flap, and an intermediate portion of the edge reinforcing portion; and A step of folding two or more folds inside the edge of the opening of the trunk, a step of folding the flap so as to close the opening of the trunk, and a step of fixing a joint between the flaps facing each other And including.

  ADVANTAGE OF THE INVENTION According to this invention, manufacturing cost and conveyance cost can be suppressed, suppressing the shift | offset | difference and opening of the joint of the flap of a packaging box.

It is the (A) external appearance perspective view which showed the structure of the packaging box which concerns on Embodiment 1 typically, (B) The partial expanded sectional view between XX '. FIG. 5 is a process plan view schematically showing the method for manufacturing the packaging box according to the first embodiment. FIG. 3 is a process exterior perspective view following FIG. 2 schematically showing the method for manufacturing the packaging box according to the first embodiment. It is the (A) external appearance perspective view which showed the structure of the packaging box which concerns on Embodiment 2 typically, (B) The partial expanded sectional view between XX '. It is the top view which showed typically the structure of the modification of the engaging part of the packaging box which concerns on Embodiment 2. FIG. FIG. 5 is a process plan view schematically showing a method for manufacturing a packaging box according to Embodiment 2. It is a process external appearance perspective view following FIG. 6 which showed the manufacturing method of the packaging box which concerns on Embodiment 2 typically. It is the (A) external appearance perspective view which showed the structure of the packaging box which concerns on Embodiment 3 typically, (B) The partial expanded sectional view between XX '. FIG. 10 is a process plan view schematically showing a method for manufacturing a packaging box according to Embodiment 3. FIG. 6 is a process exterior perspective view following FIG. 2 schematically illustrating a method for manufacturing a packaging box according to Embodiment 3.

  Hereinafter, embodiments will be described with reference to the drawings. Note that, in the present application, where reference numerals are attached to the drawings, these are only for the purpose of helping understanding, and are not intended to be limited to the illustrated embodiments.

[Embodiment 1]
A packaging box according to Embodiment 1 will be described with reference to the drawings. FIG. 1: is the (A) external appearance perspective view which showed the structure of the packaging box which concerns on Embodiment 1 typically, (B) The partial expanded sectional view between XX '.

  The packaging box 1 includes a body portion 2, edge reinforcement portions 6 and 7, and a flap 4. The trunk | drum 2 is a rectangular tube-shaped part surrounding predetermined space (for example, space which accommodates articles | goods). The edge reinforcement parts 6 and 7 are parts that reinforce the edge part of the opening (corresponding to 15 in FIG. 3A) of the body part 2. The edge reinforcing portion 6 is connected to the end portion of the trunk portion 2 on the opening 15 side. The edge reinforcing portion 7 is connected to the distal end portion of the edge reinforcing portion 6. The edge reinforcing portions 6 and 7 are folded twice or more inside the edge portion of the opening of the trunk portion 2 (corresponding to 15 in FIG. 3A). The flap 4 is bent and connected at the distal end portion of the edge reinforcing portion 7. The flap 4 is divided at each corner of the opening of the body 2 (corresponding to 15 in FIG. 3A), and there are a plurality of flaps. The flap 4 closes the opening 15 of the trunk portion 2.

  The manufacturing method of the packaging box which concerns on Embodiment 1 is demonstrated using drawing. FIG. 2 is a process plan view schematically showing the method for manufacturing the packaging box according to the first embodiment. FIG. 3 is a process exterior perspective view following FIG. 2 schematically showing the method for manufacturing the packaging box according to the first embodiment.

  First, the sheet member is cut into a developed form of a packaging box (corresponding to 1 in FIG. 3B) in which a plurality of flaps 4 are connected to the end portion of the body portion 2 through edge reinforcing portions 6 and 7. (Step A1; see FIG. 2A).

  Next, fold lines 8 to 10 parallel to each other are connected to the connecting portion between the body portion 2 and the edge reinforcing portion 6, the connecting portion between the edge reinforcing portion 7 and the flap 4, and the intermediate portion between the edge reinforcing portions 6 and 7. (Step A2; see FIG. 2B).

  Next, the edge reinforcing portions 6 and 7 are folded more than twice inside the edge portion of the opening 15 of the trunk portion 2 (folding the folds (8 and 10 in FIG. 2B)) (step A3; FIG. 3 (A)). At this time, the body portion 2 is formed in a square tube shape, but the edge reinforcing portions 6 and 7 may be folded before or after the body portion 2 is formed in a square tube shape.

  Next, the flap 4 is folded (at the crease (9 in FIG. 2)) so as to close the opening (15 in FIG. 3 (A)) of the body 2 (step A4; see FIG. 3 (B)).

  Finally, the joint between the flaps 4 facing each other is fixed (step A5).

  According to the first embodiment, the edge reinforcing portions 6 and 7 can suppress the distortion of the opening 15 of the packaging box 1, and can suppress the misalignment and opening of the flap 4 when the flap 4 is closed. In addition, by providing the edge reinforcing portions 6 and 7 at the edge of the opening 15 of the body portion 2, it is not necessary to have a double structure of the outer box and the inner box, so that the manufacturing cost can be suppressed. Further, by providing the edge reinforcing portions 6 and 7 on the inner side of the edge portion of the opening 15 of the body portion 2, there is no bulge to the outside, so that the conveyance cost can be suppressed.

[Embodiment 2]
A packaging box according to Embodiment 2 will be described with reference to the drawings. FIG. 4: is the (A) external appearance perspective view which showed the structure of the packaging box concerning Embodiment 2 typically, (B) The partial expanded sectional view between XX '. FIG. 5 is a top view schematically showing a configuration of a modified example of the engaging portion of the packaging box according to the second embodiment.

  The packaging box 1 is a box for packaging (for example, storing and packing) an article. As a material of the packaging box 1, for example, a foldable sheet member such as cardboard, cardboard, white paperboard, interleaf, resin sheet or the like can be used. The packaging box 1 is composed of a single sheet member. The packaging box 1 can be applied to general logistics (warehouse packaging (packaging), commercial packaging) applications in the logistics and warehouse industries. The packaging box 1 includes a body portion 2, upper flaps 4 a to 4 d, a lower flap 5, and edge reinforcement portions 6 and 7.

  Here, the articles stored in the packaging box 1 include, for example, (a) an article having the same volume as the packaging box 1, and (b) a box that has elasticity and is packed in the packaging box 1. (C) When the upper flaps 4a to 4d are closed, a gap is formed between the upper flaps 4a and 4c (between the upper flaps 4b and 4d), and the upper flap 4a. 4c (upper flaps 4b, 4d) cannot be stopped together (for example, the adhesive region of the gum tape with the upper flaps 4a, 4c becomes smaller, the ends of the upper flaps 4a, 4c come off from the gum tape, the upper flaps 4a, An article or the like that widens the gap so that a part of 4c is opened) can be used.

  The trunk | drum 2 is a rectangular tube-shaped (rectangular cylinder shape) part surrounding predetermined space (space which accommodates articles | goods). The trunk portion 2 has a seam (3 in FIG. 6B) connected to one end portion in the circumferential direction. The seam allowance (3 in FIG. 6B) is fixed to the edge of the other end of the body 2 opposite to the one end in the circumferential direction (which may be inside or outside). The seam (3 in FIG. 6B) is fixed to the edge of the other end of the body 2 by adhesion or staples. The trunk | drum 2 has a crease | fold (12, 13 of FIG. 6 (B)) in each corner | angular part of a square tube. The crease (12 in FIG. 6B) is a crease formed at a corner (three corners) other than the joint of the body 2 among the corners of the square tube. A crease (13 in FIG. 6B) is a crease formed at a corner that becomes a joint of the body 2 among the corners of the square tube, and the joint (3 in FIG. 6B) and the body 2 is formed.

  The upper flaps 4 a to 4 d are portions that block the opening (15 in FIG. 7A) on the upper end side of the body portion 2. The upper flaps 4a to 4d are connected to the upper end of the trunk portion 2 via the edge reinforcing portions 6 and 7 (see FIG. 6B). The upper flaps 4a to 4d are connected to each other at the front end portion of the edge reinforcing portion 7 by being folded inward at a crease (9 in FIG. 6B). The upper flaps 4a to 4d are divided at each corner of an opening (corresponding to 15 in FIG. 7A) on the upper end side of the trunk portion 2. The upper flaps 4a to 4d are arranged in this order in the counterclockwise direction in the circumferential direction. The upper flaps 4a and 4c are outer flaps arranged outside the upper flaps 4b and 4d. The upper flaps 4b and 4d are inner flaps arranged inside the upper flaps 4a and 4c. The upper flaps 4a and 4c and the upper flaps 4b and 4d may be reversed in the relationship between the inside and the outside. Further, the position of the crease (9 in FIG. 6B) may be adjusted according to the relationship between the inside and outside of the upper flaps 4a, 4c and the upper flaps 4b, 4d.

  The upper flap 4a and the upper flap 4c face each other. The front end portions of the upper flaps 4a and 4c have engaging portions 21a and 21c that are engaged (fit and fit) with each other. The engaging portion 21a has one or a plurality of convex portions. The engaging portion 21c has a concave portion that engages with the convex portion of the engaging portion 21a. The side end surface of the convex portion of the engaging portion 21a is a reference line (20 in FIG. 5A) parallel to the fold line (9 in FIG. 5A) of the connecting portion between the edge reinforcing portion 7 and the upper flap 4a; It is preferable that the angle is larger than 0 ° and smaller than 90 ° and larger than 45 ° and smaller than 90 ° with respect to a virtual line). By making it larger than 45 °, the convex portion has durability against the displacement force, the deformation is suppressed, and it is possible to prevent troubles when closing the upper flaps 4a to 4d. By making it smaller than 90 °, the shifting force of the convex portion can be suppressed, and the gaps between the upper flaps 4a to 4d on both sides can be prevented from widening. In addition, when the side end surface of the convex portion is 90 ° or more, the end portions of the lids on both sides are slightly displaced, so that the convex portion and the concave portion partially overlap, causing trouble when closing the upper flaps 4a to 4d. .

  Similarly to the upper flap 4a and the upper flap 4c, the upper flap 4b and the upper flap 4d face each other. The front end portions of the upper flaps 4b and 4d have engaging portions 21b and 21d that engage with each other. The engaging portion 21b has one or a plurality of convex portions. The engaging portion 21d has a concave portion that engages with the convex portion of the engaging portion 21b. The side end surface of the convex portion of the engaging portion 21b has an angle larger than 0 ° and smaller than 90 ° with respect to a reference line (virtual line) parallel to the fold of the connecting portion between the edge reinforcing portion 7 and the upper flap 4b. The angle is preferably larger than 45 ° and smaller than 90 °. The upper flaps 4b and 4d may be configured not to have the engaging portions 21b and 21d.

  The convex portions of the engaging portions 21a and 21b have the width of the base portion wider than the width of the tip (see FIG. 5A). The tips of the convex portions of the engaging portions 21a and 21b are, for example, the convex portions of the engaging portions 22a and 22b in FIG. 5B, in addition to those that are pointed in a triangular shape as shown in FIG. It may be a trapezoidal shape as shown in FIG. 5 and may be a curved surface whose angle changes like the convex portions of the engaging portions 23a and 23b in FIG. Moreover, the both end surfaces of the convex portions of the engaging portions 21a and 21b may or may not be line-symmetric with each other. Further, the number of the convex portions of the engaging portions 21a and 21b may be one or plural. When there are a plurality of convex portions of the engaging portions 21a and 21b, the shape of each convex portion may be different, but it is desirable to be monotonous.

  The lower flap 5 is a portion that closes the opening on the lower end side of the body portion 2. The lower flap 5 is connected to the lower end of the body portion 2 by being folded inward at a crease (11 in FIG. 6B). The lower flap 5 is divided at each corner of the body 2 and there are a plurality of lower flaps 5. In addition, each lower flap 5 is good also as a structure similar to upper flap 4a-4d. Further, there may be a material similar to the edge reinforcing portions 6 and 7 between the lower flap 5 and the body portion 2.

  The edge reinforcement parts 6 and 7 are parts that reinforce the edge part of the opening (15 in FIG. 7A) on the upper end side of the body part 2. The edge reinforcing portions 6 and 7 function as beams that reinforce the opening (15 in FIG. 7A) of the trunk portion 2. The edge reinforcing portion 6 is connected by being folded back and inward at the upper end of the body portion 2 at a fold line (8 in FIG. 6B). The edge reinforcing portion 7 is connected by being folded back and inward at the crease (10 in FIG. 6B) at the tip of the edge reinforcing portion 6. That is, the edge reinforcing portions 6 and 7 are folded by alternately performing mountain folds and valley folds. The edge reinforcing portions 6 and 7 are folded twice or more (double in FIG. 4) inside the edge of the opening of the trunk portion 2 (corresponding to 15 in FIG. 3). At the edge of the opening on the upper end side of the body 2 (15 in FIG. 7A), the body 2, the edge reinforcement 6 and the edge reinforcement 7 are overlapped to form a triple layer. Furthermore, it is possible to add 5 layers, 7 layers, and so on. The edge reinforcing parts 6 and 7 are divided at the corners of the opening (15 in FIG. 7A) of the body part 2. In addition, the edge reinforcement parts 6 and 7 do not need to be divided | segmented by the corner | angular part of opening of the trunk | drum 2 (15 of FIG. 7 (A)), if there is no trouble in the manufacturing process of a packaging box. The edge reinforcing parts 6 and 7 are fixed (adhered and stapled) to the edge part of the opening (15 in FIG. 7A) of the body part 2.

  The manufacturing method of the packaging box which concerns on Embodiment 2 is demonstrated using drawing. FIG. 6 is a process plan view schematically showing the method for manufacturing the packaging box according to the second embodiment. FIG. 7 is a process exterior perspective view following FIG. 6 schematically showing the method for manufacturing a packaging box according to the second embodiment.

  First, using a cutting machine or the like, the sheet member is connected to the end portion of the body portion 2 via the edge reinforcing portions 6 and 7, and a plurality of flaps 4 are connected to the front end portions of the upper flaps 4 a to 4 d. A packaging box (corresponding to 1 in FIG. 7B) having the engaging portions 21a to 21d is cut into a developed two-dimensional shape (step B1; see FIG. 6A).

  Next, by pressing the cut sheet member with a press or the like, the connecting portion between the body portion 2 and the edge reinforcing portion 6, the connecting portion between the edge reinforcing portion 7 and the upper flaps 4a to 4d, and the edge reinforcing portion 6 Folds 8 to 13 parallel to each other at the intermediate portion of 7, the connecting portion between the trunk portion 2 and the lower flap 5, the corner portion of the trunk portion 2, and the connecting portion between the trunk portion 2 and the joint 3. (Step B2; see FIG. 6B). Note that step B2 may be performed before step B1.

  Here, the folds 8 to 13 are portions that make it easy to bend and crush the thickness of the sheet member, and prevent bending at portions other than the predetermined folds 8 to 13. When the sheet member is corrugated cardboard, the direction of the folds 8 to 11 is perpendicular to the longitudinal direction of the corrugated paper sandwiched between the front and back surfaces of the corrugated cardboard, as in a normal packaging box. . Therefore, the longitudinal direction of the edge reinforcing portions 6 and 7 is the same as the longitudinal direction of the corrugated paper sandwiched between the front and back surfaces of the cardboard. In this direction (longitudinal direction), the rigidity is weak (the fracture strength is not weak, it is weak to bending and bends relatively easily. Therefore, the packaging box 1 is deformed in this bending direction, and the upper flap of the packaging box 1 is bent. 4a to 4d, the mating surfaces are opened.) However, by overlapping multiple layers, rigidity is increased and deformation and deflection are reduced.

  Next, the body 2 is bent into a rectangular tube shape, the joint 3 is fixed to the inside of the edge of the other end of the body 2 (adhesion, staple, etc.), and the lower flap 5 is bent and fixed (stapler). By fixing (fixing, adhering, and fixing the tape), an assembly in which the upper end side of the body 2 is opened is assembled (step B3).

  Next, the edge reinforcing portions 6 and 7 are folded over inside the edge portion of the opening 15 of the body portion 2 (folding the folds (8 and 10 in FIG. 6B)) more than twice (in a bellows shape). To fix (adhesion, staple, etc.) (step B4; see FIG. 7A). At this time, the upper flaps 4a to 4d are in an open state. Note that step B4 may be performed before step B3.

  Next, an article (not shown) is stored in the body 2 from the opening 15 (step B5).

  Next, the upper flaps 4b and 4d are folded at the fold line (9 in FIG. 6B) so as to close the opening (15 in FIG. 7A), and then the upper flaps 4a and 4c are folded at the fold line (FIG. B) is bent at 9) (step B6; see FIG. 7B). Here, when the upper flaps 4b and 4d are bent, the engaging portion 21b and the engaging portion 21d are engaged. Further, when the upper flaps 4b and 4d are bent, a joint between the upper flaps 4b and 4d may be fixed (tape fixing, staple stop, etc.). Further, when the upper flaps 4a and 4c are bent, the engaging portion 21a and the engaging portion 21c are engaged.

  Finally, the joint between the upper flaps 4a and 4c facing each other is fixed (step B7). For fixing the seam, for example, gummed tape, packing adhesive tape, cloth tape, craft tape, PP (polypropylene) tape, stapler, and the like can be used.

  According to the second embodiment, as in the first embodiment, the edge reinforcement portions 6 and 7 increase the strength of the opening 15 of the body portion 2 and the distortion of the opening 15 compared to the case where the edge reinforcement portions 6 and 7 are not provided. And the misalignment and opening of the upper flaps 4a and 4c (upper flaps 4b and 4d) when the upper flaps 4a to 4d are closed can be suppressed. Thereby, it becomes easy to fix the upper flaps 4a and 4c (upper flaps 4b and 4d) by fixing means such as a tape, and when closing the upper flaps 4a to 4d, the upper flaps 4a and 4c (upper flaps 4b and 4d). They can be easily fixed together.

Further, according to the second embodiment, by providing the edge reinforcing portions 6 and 7 at the edge portion of the opening 15 of the trunk portion 2, it is not necessary to have a double structure of the outer box and the inner box, thereby reducing the manufacturing cost. be able to.
Moreover, since the edge reinforcement parts 6 and 7 can be included in the original form of the packaging box 1 by cutting one sheet member with a cutting machine or the like, a new member separated from the packaging box 1 (for example, patent document) It is not necessary to add a corrugated cardboard box such as 1 to the packaging box 1, and the manufacturing cost can be reduced.

  Further, by providing the edge reinforcing portions 6 and 7 on the inner side of the edge portion of the opening 15 of the trunk portion 2, there is no bulge to the outside, so that the conveyance cost can be suppressed. In addition, since the edge reinforcing portions 6 and 7 are included in the original packaging box 1, there is no large protrusion before the packaging box 1 is assembled, and the packaging box 1 before assembly is carried and transported in a folded state. can do. Further, after the packaging box 1 is used, the packaging box 1 can be folded and carried or transported without separating the edge reinforcing portions 6 and 7.

  Furthermore, according to the second embodiment, the upper flaps 4a to 4c are engaged by the engagement between the engaging portions 21a and 21c (engaging portions 21b and 21d) of the upper flaps 4a and 4c (upper flaps 4b and 4d) of the packaging box 1. When 4d is closed, the joints between the tips of the upper flaps 4a and 4c are two-dimensionally combined. Accordingly, the upper flaps 4a and 4c (upper flaps 4b and 4d) can be easily aligned with each other, and the leading ends of the upper flaps 4a and 4c (upper flaps 4b and 4d) are folded (see FIG. 5A). No deviation occurs in the direction parallel to 9).

[Embodiment 3]
A packaging box according to Embodiment 3 will be described with reference to the drawings. FIG. 8: is the (A) external appearance perspective view which showed the structure of the packaging box concerning Embodiment 3 typically, (B) The partial expanded sectional view between XX '.

  The third embodiment is a modification of the second embodiment. In the configuration of the second embodiment (see FIG. 4), corner reinforcement is provided on both sides of the root folds (9 in FIG. 9B) of the upper flaps 4a to 4d. The parts 30a to 30h are provided. Other configurations are the same as those of the second embodiment.

  The corner reinforcement portions 30a to 30h are portions that reinforce the corner portion of the opening (15 in FIG. 10B) of the trunk portion 2. The corner reinforcing portions 30a, 30b (corner reinforcing portions 30c, 30d, corner reinforcing portions 30e, 30f, corner reinforcing portions 30g, 30h) are the root portions of the upper flap 4a (upper flap 4b, upper flap 4c, upper flap 4d). It is separated from the upper flap 4a on both sides, and is bent and connected at the fold line (9 in FIG. 9B) of the edge reinforcing portion 7. Adjacent corner reinforcing portions 30a and 30h (corner reinforcing portions 30b and 30c, corner reinforcing portions 30d and 30e, and corner reinforcing portions 30f and 30g) are overlapped and fixed (for example, adhesion, tape fixing, staple fixing, etc.). Yes. Note that it does not matter which of the overlapping corner reinforcing portions is above or below. The corner reinforcing portions 30a to 30h are formed by the cut portions 31a to 31h obliquely cut from the side end surfaces of the upper flaps 4a to 4d toward the folds (9 in FIG. 9B) of the upper flaps 4a to 4d. It is separated from the flaps 4a to 4d. The cut portions 31a to 31h are formed when a sheet member is cut with a cutting machine or the like to produce a prototype in which the packaging box 1 is developed.

  The manufacturing method of the packaging box which concerns on Embodiment 3 is demonstrated using drawing. FIG. 9 is a process plan view schematically showing the method for manufacturing the packaging box according to the third embodiment. FIG. 10 is a process exterior perspective view following FIG. 2 schematically illustrating the method for manufacturing the packaging box according to the third embodiment.

  First, using a cutting machine or the like, the sheet member is engaged with the end portions of the upper flaps 4a to 4d by connecting the plurality of flaps 4 to the end portions of the body portion 2 through the edge reinforcing portions 6 and 7. A packaging box (1 in FIG. 10C) having the portions 21a to 21d and the corner reinforcing portions 30a to 30h on both sides of the folds (9 in FIG. 9B) of the upper flaps 4a to 4d. Is cut into a two-dimensional shape developed (step C1; see FIG. 9A). At the time of cutting, the upper flaps 4a to 4d are formed by the cut portions 31a to 31h obliquely cut from the side end surfaces of the upper flaps 4a to 4d toward the folds (9 in FIG. 9B) of the upper flaps 4a to 4d. Corner reinforcing portions 30a to 30h separated from each other are formed.

  Next, by pressing the cut sheet member with a press or the like, a connection portion between the body portion 2 and the edge reinforcement portion 6, a connection portion between the edge reinforcement portion 7 and the upper flaps 4 a to 4 d (edge reinforcement portion 7 and corners). Connecting portion between the reinforcing portions 30a to 30h), the intermediate portion between the edge reinforcing portions 6 and 7, the connecting portion between the trunk portion 2 and the lower flap 5, the corner portion of the trunk portion 2, the trunk portion 2 and the joint Folds 8 to 13 parallel to each other are formed in each of the connecting portions with the margin 3 (step C2; see FIG. 9B). Step C2 may be performed before step C1.

  Next, the body 2 is bent into a rectangular tube shape, the joint 3 is fixed to the inside of the edge of the other end of the body 2 (adhesion, staple, etc.), and the lower flap 5 is bent and fixed (stapler). By fastening, bonding, and fixing the tape, an assembly in which the upper end side of the body portion 2 is opened is assembled (step C3).

  Next, the edge reinforcing portions 6 and 7 are folded over inside the edge portion of the opening 15 of the body portion 2 (folding the folds (8 and 10 in FIG. 6B)) more than twice (in a bellows shape). To fix (adhesion, staple, etc.) (step C4; see FIG. 10A). At this time, the upper flaps 4a to 4d and the corner reinforcing portions 30a to 30h are in an open state. Step C4 may be performed before step C3.

  Next, the corner reinforcing portions 30a and 30h (corner reinforcing portions 30b and 30c, corner reinforcing portions 30d and 30e, and corner reinforcing portions 30f and 30g) adjacent to each other are bent and adjacent to each other. The matching corner reinforcing portions 30a and 30h (corner reinforcing portions 30b and 30c, corner reinforcing portions 30d and 30e, and corner reinforcing portions 30f and 30g) are fixed (tape fixing, bonding, etc.) in a state where they overlap each other (step C5; FIG. 10). (See (B)). At this time, the upper flaps 4a to 4d are in an open state.

  Next, an article (not shown) is stored in the body 2 from the opening 15 (step C6).

  Next, the upper flaps 4b and 4d are folded at a fold (9 in FIG. 9B) so as to close the opening (15 in FIG. 10B), and then the upper flaps 4a and 4c are folded (see FIG. B) is bent at 9) (step C7; see FIG. 10C). Here, when the upper flaps 4b and 4d are bent, the engaging portion 21b and the engaging portion 21d are engaged. Further, when the upper flaps 4b and 4d are bent, a joint between the upper flaps 4b and 4d may be fixed (tape fixing, staple stop, etc.). Further, when the upper flaps 4a and 4c are bent, the engaging portion 21a and the engaging portion 21c are engaged.

  Finally, the joint between the upper flaps 4a and 4c facing each other is fixed (step C8). For fixing the seam, for example, gummed tape, packing adhesive tape, cloth tape, craft tape, PP (polypropylene) tape, stapler, and the like can be used.

  According to the third embodiment, the same effects as those of the second embodiment are obtained, and by providing the corner reinforcing portions 30a to 30h, when the article is placed in the packaging box 1 and the upper flaps 4a to 4d are closed, The deformation of the corners of the opening 15 can be suppressed (it is difficult to open the corners), and the displacement and opening of the upper flaps 4a to 4d when the upper flaps 4a to 4d are closed can be more effectively suppressed. Further, the corner reinforcement portions 30a to 30h can be formed by forming a prototype in which the packaging box 1 is developed from one sheet member with a cutting machine or the like, and there is no need to add a new member to the packaging box 1 Manufacturing costs can be reduced. In addition, when the packaging box 1 is folded after the packaging box 1 is used, the corner reinforcing portions (for example, the corner reinforcing portion 30a) of the two opposite corners (the two on the wider side) among the corner reinforcing portions 30a to 30h. , 30h, the corner reinforcing portions 30d, 30e) can be simply folded (peeled off) to fold the packaging box 1. That is, the corner portions of the corner reinforcing portions (for example, the corner reinforcing portions 30a and 30h and the corner reinforcing portions 30d and 30e) that have been fixed are widened, and the corner reinforcing portions (for example, the corner reinforcing portions 30b and 30c) that have not been fixed are released. The corner portions of the corner reinforcing portions 30f, 30g) are not hindered by folding the packaging box 1 by folding inward.

(Appendix)
In the present invention, the packaging box according to the first aspect is possible.

  The packaging box which concerns on a said 1st viewpoint WHEREIN: The said edge reinforcement part is folded by the mountain fold and valley fold being performed alternately.

  The packaging box which concerns on a said 1st viewpoint WHEREIN: The said edge reinforcement part is divided | segmented by the corner | angular part of the said opening of the said trunk | drum.

  The packaging box which concerns on a said 1st viewpoint WHEREIN: The said edge reinforcement part is being fixed to the said edge part of the said trunk | drum.

  The packaging box which concerns on a said 1st viewpoint WHEREIN: The said edge reinforcement part is being fixed to the said edge of the said trunk | drum by adhesion | attachment or a stapler.

  In the packaging box according to the first aspect, the first flap and the second flap of the plurality of flaps face each other, and the respective leading end portions of the first flap and the second flap engage with each other. It has a 1st engaging part and a 2nd engaging part.

  In the packaging box according to the first aspect, the first engaging portion has one or a plurality of first convex portions, and the second engaging portion engages with the first convex portions. The first concave portion is included.

  In the packaging box according to the first aspect, the side end surface of the first convex portion has an angle greater than 0 ° and 90 ° with respect to a reference line parallel to the fold of the connection portion between the edge reinforcing portion and the flap. Smaller than.

  The packaging box which concerns on a said 1st viewpoint WHEREIN: The said side end surface of a said 1st convex-shaped part is larger than an angle 45 degrees with respect to the said reference line, and smaller than 90 degrees.

  In the packaging box according to the first aspect, the third flap and the fourth flap of the flaps are opposed to each other, and the respective leading end portions of the third flap and the fourth flap are engaged with each other. It has an engaging part and a 4th engaging part.

  In the packaging box according to the first aspect, the third engaging portion has one or a plurality of second convex portions, and the fourth engaging portion engages with the second convex portions. A second concave portion is included.

  In the packaging box according to the first aspect, the side end surface of the second convex portion is larger than an angle of 0 ° with respect to a reference line parallel to the fold of the connection portion between the edge reinforcing portion and the third flap. Less than 90 °.

  The packaging box which concerns on a said 1st viewpoint WHEREIN: The said side end surface of a said 2nd convex-shaped part is larger than 45 degrees and smaller than 90 degrees with respect to the said reference line.

  In the packaging box according to the first aspect, the corner portion of the opening of the trunk portion is reinforced, and the flap is separated from the flap on both sides of the base portion of the flap, and is bent at the tip of the edge reinforcing portion. And the corner reinforcing portions connected to each other, and the adjacent corner reinforcing portions overlap each other.

  In the packaging box according to the first aspect, the corner reinforcing portion is separated from the flap by a cut portion that is obliquely cut from a side end surface of the flap toward a bent portion of the flap.

  In the packaging box according to the first aspect, the adjacent corner reinforcing portions are overlapped and fixed.

  In the packaging box according to the first aspect, the packaging box is constituted by a single sheet member.

  In the packaging box according to the first aspect, the trunk portion is connected to a circumferential end at one end portion in the circumferential direction, and the joint margin is the other end portion on the opposite side in the circumferential direction with respect to the one end portion in the trunk portion. Fixed to the edge of the.

  In the packaging box according to the first aspect, the seam is fixed to an edge portion of the other end portion of the trunk portion by adhesion or staple.

  In the manufacturing method of the packaging box according to the second aspect, the step of cutting the packaging box in which a plurality of flaps are connected to the end of the trunk part via the edge reinforcing part, and the trunk part and the edge Forming a crease parallel to each of a connecting portion with the reinforcing portion, a connecting portion between the edge reinforcing portion and the flap, and an intermediate portion of the edge reinforcing portion; and A step of folding two or more folds inside the edge of the opening, a step of bending the flap so as to close the opening of the body portion, and a step of fixing a joint between the flaps facing each other. .

  In this invention, the form of the manufacturing method of the packaging box which concerns on a said 2nd viewpoint is possible.

  In the packaging box manufacturing method according to the second aspect, in the step of cutting the packaging box into a developed shape, the packaging box is cut obliquely from a side end surface of the flap toward a connection portion between the flap and the edge reinforcing portion. The adjacent corners are cut after forming the corner reinforcing portion separated from the flap by the inserted cut portion, and after the step of folding the edge reinforcing portion and before the step of bending the flap. The method further includes a step of bending the corner reinforcing portion so that the reinforcing portions overlap each other.

  The disclosure of the above patent document is incorporated herein by reference. Within the scope of the entire disclosure (including claims and drawings) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. In addition, various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) are possible within the framework of the entire disclosure of the present invention. It is. That is, the present invention naturally includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the drawings, and the technical idea. Further, regarding numerical values and numerical ranges described in the present application, it is considered that any intermediate value, lower numerical value, and small range are described even if not specified.

DESCRIPTION OF SYMBOLS 1 Packaging box 2 trunk | drum 3 joint allowance 4 flap 4a-4d upper flap 5 lower flap 6, 7 edge reinforcement part 8-13 crease | fold 15 opening 20 reference line 21a-21d, 22a-22d, 23a-23d engaging part 30a- 30h corner reinforcement part 31a-31h cut part

Claims (10)

A rectangular tube-shaped trunk surrounding a predetermined space;
An edge reinforcing portion that reinforces an edge of the opening of the trunk, is connected to an end of the trunk on the opening side, and is folded twice or more inside the edge of the trunk,
A plurality of flaps that are bent and connected at the tip of the edge reinforcing portion, are divided at corners of the opening of the trunk, and close the opening of the trunk,
Packaging box with. The edge reinforcing portion is folded by overlapping mountain folds and valley folds,
The packaging box according to claim 1. The edge reinforcing portion is fixed to the edge portion of the trunk portion,
The packaging box according to claim 1 or 2. The first flap and the second flap among the plurality of flaps face each other,
Each front end portion of the first flap and the second flap has a first engagement portion and a second engagement portion that engage with each other.
The packaging box according to any one of claims 1 to 3. The first engaging portion has one or a plurality of first convex portions,
The second engaging portion has a first concave portion that engages with the first convex portion.
The packaging box according to claim 4. The side end surface of the first convex portion has an angle larger than 0 ° and smaller than 90 ° with respect to a reference line parallel to the fold of the connecting portion between the edge reinforcing portion and the first flap.
The packaging box according to claim 5. In addition to reinforcing the corners of the opening of the body portion, the corner further includes a corner reinforcing portion that is separated from the flap on both sides of the base portion of the flap and is bent and connected at the tip of the edge reinforcing portion,
The adjacent corner reinforcements overlap each other,
The packaging box according to any one of claims 1 to 6. The adjacent corner reinforcements are overlapped and fixed,
The packaging box according to claim 7. The packaging box is composed of one sheet member,
The packaging box according to any one of claims 1 to 8. Cutting the sheet member into a developed form of a packaging box in which a plurality of flaps are connected to the end of the body portion via an edge reinforcing portion;
Forming folds parallel to each other in a connecting portion between the body portion and the edge reinforcing portion, a connecting portion between the edge reinforcing portion and the flap, and an intermediate portion of the edge reinforcing portion;
Folding the edge reinforcing portion twice or more inside the edge of the opening of the body portion;
Bending the flap so as to close the opening of the body portion;
Fixing the seam between the flaps facing each other;
A method for manufacturing a packaging box including:

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