JP2023002259A - packaging box - Google Patents

Abstract

To provide a packaging box that can close an opening by squeezing side plates.SOLUTION: A thickness changeable packaging box 1 includes: a pair of flat plates 10 and 11 having an opening M; and a pair of side plates 12 disposed on both right and left sides of the flat plates 10 and 11 and connected consecutively to the pair of flat plates 10 and 11 via a pair of first stretchable fold lines L5. The side plates 12 have a second stretchable fold line L6 formed extending in the front-back direction between the pair of first stretchable fold lines L5 and a pair of first dividing lines L7 formed extending from the pair of first stretchable fold lines L5 to the second stretchable fold line L6. The side plates 12 have a pair of first side portions 21 on the opening M side and a pair of second side portions 22 at the rear. When the pair of flat plates 10 and 11 are separated, each side plate 12 becomes an extended form F4, and in the extended form F4, the pair of first side portions 21 are inverted folded along the pair of first dividing lines L7 and the second stretchable fold line L6 so that they are indented inwardly to narrow the opening M.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a packaging box formed with a variable thickness.

Corrugated cardboard envelopes are known that are formed by folding back the adhesive margins that are continuously provided on the front surface and adhering them to the back surface (Patent Document 1). A plurality of folding lines are formed on the bottom and both sides of the envelope, and by appropriately folding the folding lines, gussets corresponding to the thickness of the contents are formed on the bottom and both sides of the envelope. A closing margin is continuously provided at the upper end of the envelope, and a folding line is formed in the closing margin for flexing the closing margin when the envelope is inflated to facilitate folding.

Utility Model Registration No. 3094232

In the corrugated cardboard envelope described above, since gussets are formed on the top, bottom, left, and right, thick contents can be sealed. However, since the closing margin cannot be closed by squeezing the opening of the envelope, the closing margin that warped after sealing and both sides of the envelope tend to expand and contract in the thickness direction, and the shape of the envelope after sealing does not change. There was a fear of indefiniteness.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a packaging box whose opening can be closed by narrowing the side plates.

The present invention is a packaging box formed so that the thickness of an accommodation space for accommodating an object to be packaged can be changed, and has openings to the accommodation space in at least one of the depth directions and opposite to each other in the thickness direction. A pair of flat plates and a pair of first expansion/contraction fold lines arranged on both sides in the width direction of the pair of flat plates and extending in the depth direction while being inclined to separate from each other as the opening is approached. and a pair of side plates connected to the flat plate, each of the side plates includes a second elastic fold line extending along the depth direction between the pair of first elastic fold lines, and a pair of the first elastic fold lines. and a pair of first partition lines extending from the first elastic fold line toward the second elastic fold line while being inclined in one direction in the depth direction, and each of the side plates is deeper than the pair of the first partition lines. A pair of first side portions separated by the second stretchable fold line in one of the directions, and a pair of second side portions separated by the second stretchable fold line in the other depth direction than the pair of the first partition lines. and, when the pair of flat plates come into contact with each other or come close to each other, each of the side plates assumes a bent form in which each side plate is positively folded along the second elastic fold line so as to protrude outward in the width direction, When the pair of flat plates are spaced apart, each of the side plates is in an elongated configuration that is stretched in the thickness direction, and when each of the side plates is in the elongated configuration, the pair of second side portions is maintained in a stretched state in the thickness direction, and the pair of first side portions are reversely folded along the pair of the first partition line and the second elastic fold line so as to be recessed inward in the width direction. narrowing the opening;

In this case, each of the side plates is formed with a pair of second partition lines extending so as to bridge between the intersections of the pair of first elastic fold lines and the pair of first partition lines, and the pair of The second side portion is partitioned by the second stretchable fold line on the other side in the depth direction than the pair of second partition lines, and each of the side plates includes the pair of first partition lines and the pair of second partition lines. and a pair of inwardly folded side portions separated by the second elastic fold line between the pair of inwardly folded side portions when each of the side plates is in the elongated configuration to narrow the opening. may be reversely folded along the second elastic fold line and forwardly folded along the pair of second partition lines so as to incline inward in the width direction.

In this case, the distance from one end of the side plate in the depth direction to the intersection point of the first elastic fold line and the first partition line is more than 1/4 and less than 1/2 of the total length of the side plate in the depth direction. There may be.

In this case, at least one of the pair of flat plates may be formed with a weakened portion for bending or bending the flat plate when narrowing the opening.

In this case, the weakened portion is an auxiliary fold line extending so as to connect the intersections of the first elastic fold line and the first partition line located on both sides in the width direction, and the auxiliary fold line is one side in the depth direction. Or you may curve or bend so that it may bulge toward the other.

In this case, the pair of flat plates are opposed to each other in the thickness direction and connected at the other end in the depth direction, and the pair of side plates is either one of the pair of flat plates via the first elastic fold line. A sealing piece for closing the opening is continuously provided at one end in the depth direction of one of the pair of flat plates, and is connected to both ends in the width direction of the pair of side plates. A pair of connecting pieces are continuously provided via the first elastic fold line, and in a state in which each of the side plates is bridged over the pair of the flat plates, the pair of connecting pieces is connected to the other flat plate and become part of the other plane plate.

Further, in this case, the pair of side plates are connected to both ends in the width direction of either one of the pair of flat plates via the first expansion/contraction fold line, and at both ends in the width direction of the pair of side plates, A pair of split pieces are connected via the first elastic fold line, and a sealing piece for closing the opening is connected to one end of one of the flat plates in the depth direction. A connecting piece is continuously provided at the other end in the direction, and the pair of divided pieces is folded back so as to face one of the flat plates to form the other flat plate, and the connecting piece is folded back. It may be a part of the other plane plate by being connected to the other plane plate.

According to the present invention, the side plate can be squeezed to close the opening.

It is a perspective view showing a packaging box (thin form) concerning one embodiment of the present invention. It is a perspective view showing a packaging box (thick form) concerning one embodiment of the present invention. 1 is a plan view showing a blank of a packaging box according to one embodiment of the present invention; FIG. FIG. 5 is a perspective view showing a process of accommodating a thin packaged object in a packaging box according to an embodiment of the present invention; FIG. 4 is a perspective view showing a process of accommodating a thick package in a packaging box according to an embodiment of the present invention; It is a perspective view which shows the process which makes the packaging box based on one Embodiment of this invention into a thick form. FIG. 4 is a perspective view showing an enlarged part of a side plate when the packaging box according to one embodiment of the present invention is made into a thick form. It is a top view which shows the blank of the packaging box based on the 1st modification of one embodiment of this invention. FIG. 11 is a plan view showing a blank of a packaging box according to a second modified example of one embodiment of the present invention; FIG. 11 is a plan view showing a blank of a packaging box according to a third modified example of one embodiment of the present invention;

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that Fr, Rr, L, R, U, and D shown in the drawings indicate front, rear, left, right, up, and down. The front-back direction, the left-right direction, and the up-down direction are orthogonal to each other. The front-rear direction is an example of the depth direction, the left-right direction is an example of the width direction, and the up-down direction is an example of the thickness direction. Terms indicating direction and position are used in this specification, but these terms are used for convenience of description and are not intended to limit the technical scope of the present invention. Also, terms indicating directions and positions are mainly based on the directions and positions when using the packaging box.

A packaging box 1 according to the present embodiment will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a perspective view showing a packaging box 1 (thin form F1). FIG. 2 is a perspective view showing the packaging box 1 (thick form F2). FIG. 3 is a plan view showing the blank 1A of the packaging box 1. FIG.

As shown in FIGS. 1 and 2, the packaging box 1 is formed in a thin rectangular parallelepiped shape with a thickness (height) shorter than the dimensions in the front-rear and left-right directions. The packaging box 1 is, for example, a so-called post-in box that can be put in a mailbox. The packaging box 1 is formed so that the thickness (height) of the accommodation space S in which the object to be packaged G is accommodated can be changed. Specifically, the packaging box 1 has a thin shape F1 (see FIG. 1) capable of accommodating thin packaged items G such as several sheets of documents and notebooks, and a hard-cover book, box-shaped packaged product, and the like. and a thick form F2 (see FIG. 2) capable of accommodating a thick package G of . The thickness of the packaging box 1 is appropriately adjusted according to the thickness of the object G to be packaged. In addition, the maximum height of the packaging box 1 in the thick form F2 is preferably 30 mm or less that can be posted in a general mailbox, but the technical scope of the present invention covers packaging boxes with a height exceeding 30 mm. 1 is not excluded.

The packaging box 1 is formed by assembling blanks 1A shown in FIG. The blank 1A is formed by punching out a cardboard sheet made of paper with a die or the like. The corrugated board sheet is, for example, a double-faced corrugated board sheet in which a front liner 9B and a back liner 9C (see also FIG. 4, etc.) are bonded to a corrugated medium 9A. Note that FIG. 2 shows the front liner 9B side (the outer surface of the packaging box 1). In this specification, the direction parallel to the core 9A of the corrugated cardboard sheet is called the "corrugation direction", and the direction orthogonal to the corrugation direction is called the "flow direction". The "X" shown in the drawings indicates the "row direction", and the "Y" indicates the "flow direction".

[blank]
As shown in FIG. 3, the blank 1A includes a pair of plane plates 10 and 11, a pair of side plates 12, a pair of connecting pieces 13, and a sealing piece 14. As shown in FIG. In this specification, for convenience of explanation, one flat plate 10 is called "first flat plate 10", and the other flat plate 11 is called "second flat plate 11", and the description is common to both. Then, they are simply referred to as "flat plates 10 and 11". In addition, since the pair of side plates 12 and the pair of connecting pieces 13 are formed symmetrically in the flow direction (horizontal direction) with the first flat plate 10 as the center, hereinafter, unless otherwise specified, One side plate 12 and one connecting piece 13 will be described.

<Flat plate>
A pair of flat plates 10 and 11 are arranged in a row direction and connected via a first folding line L1. The first plane plate 10 is formed in a substantially trapezoidal shape, the width of which gradually narrows in the flow direction as it separates from the first folding line L1 in the step direction. The second plane plate 11 is generally formed in a substantially trapezoidal shape that is linearly symmetrical with the first plane plate 10 with the first folding line L1 as an axis of symmetry. A pair of auxiliary side plates 15 are connected to the free end sides of both ends of the second plane plate 11 in the flow direction via first expansion/contraction auxiliary folding lines L9. Each auxiliary side plate 15 is formed in a substantially trapezoidal shape whose width gradually narrows in the step direction as it separates in the flow direction from the first expansion/contraction auxiliary fold line L9. Although the details will be described later, when the packaging box 1 is assembled, each auxiliary side plate 15 is a portion that overlaps the rear surface of the side plate 12 . Note that the pair of auxiliary side plates 15 may be omitted.

(Collapsing part)
In the vicinity of the first folding line L1 of the pair of plane plates 10 and 11, respectively, a stepped portion 16 is formed by crushing the core 9A from the back liner 9C side. The pair of stepped portions 16 are formed at positions that are symmetrical about the first folding line L1 as an axis of symmetry. Each stepped portion 16 extends across the plane plates 10 and 11 in the direction of flow, and is formed in a substantially crescent shape curved so as to swell in a direction away from the first folding line L1.

(Auxiliary polygonal line)
Further, auxiliary folding lines L10, which are examples of weakening portions, are formed at positions apart from the first folding lines L1 of the pair of plane plates 10 and 11 in the step direction. A pair of auxiliary folding lines L10 are formed at positions that are symmetrical with respect to the first folding line L1 as an axis of symmetry. Each auxiliary folding line L10 is a line extending so as to connect both ends of the plane plates 10 and 11 in the flow direction and curved so as to bulge in a direction approaching the first folding line L1.

<Side plate, connecting piece>
The pair of side plates 12 are connected to both ends of the first plane plate 10 in the flow direction via the first elastic fold line L5. The pair of connecting pieces 13 are connected to both ends of the pair of side plates 12 in the flow direction (width direction) via the first elastic fold line L5. That is, the side plate 12 is formed between the pair of first elastic fold lines L5, and the connecting piece 13 is connected to the end of the side plate 12 in the flow direction. The pair of first elastic fold lines L5 are inclined from near the ends of the first fold lines L1 toward one side in the step direction so as to separate from each other in the flow direction, and are formed in a substantially V shape. Therefore, the side plate 12 formed between the pair of first elastic fold lines L5 is formed in a substantially triangular shape. More precisely, one end of the side plate 12 in the step direction (the side opposite to the second flat plate 11) is obliquely cut away in the flow direction, so that the side plate 12 is formed in a distorted rectangular shape. . The connecting piece 13 is formed in a substantially trapezoidal shape whose width gradually narrows in the step direction from the base end in the flow direction toward the tip end. The end of the connecting piece 13 in the flow direction extends substantially parallel to the step direction, and the overall shape of the first plane plate 10, the pair of side plates 12, and the pair of connecting pieces 13 is formed in a substantially octagonal shape. there is

<Second elastic fold line, first partition line, second partition line>
Details of the side plate 12 will be described. The side plate 12 is formed with a second elastic fold line L6, a pair of first partition lines L7 and a pair of second partition lines L8.

The second elastic fold line L6 extends along the step direction (depth direction) between the pair of first elastic fold lines L5. The second elastic fold line L6 extends substantially parallel to the step direction so as to bisect the angle formed by the pair of first elastic fold lines L5. Therefore, the pair of first elastic fold lines L5 described above are inclined at substantially the same angle with respect to the second elastic fold lines L6.

The pair of first partition lines L7 and the pair of second partition lines L8 are formed near one end of the side plate 12 in the step direction (on the side opposite to the second plane plate 11). A pair of first partition lines L7 and a pair of second partition lines L8 are respectively formed to bridge between a pair of first elastic fold lines L5 and second elastic fold lines L6. Specifically, the pair of first partition lines L7 extends from the pair of first elastic fold lines L5 toward the second elastic fold line L6 while being inclined in one direction in the step direction (depth direction). The pair of second partition lines L8 extends from the intersection point P of the pair of first elastic fold lines L5 and the pair of first partition lines L7 toward the second elastic fold line L6 while being inclined in the other direction. That is, the pair of first partition lines L7 and the pair of second partition lines L8 are formed in a substantially V-shape in opposite directions. Each first partition line L7 and each second partition line L8 have substantially the same length, and are inclined at an angle of about 45 degrees with respect to the second elastic fold line L6.

The auxiliary fold line L10 of the first plane plate 10 described above extends so as to connect the intersection point P between the first elastic fold line L5 and the first partition line L7 located on both sides in the flow direction (width direction). there is Further, in each connecting piece 13, an auxiliary connecting fold line L11 extends from the intersection point P between the first elastic fold line L5 and the first partition line L7 toward the tip in the flow direction. Although the details will be described later, each auxiliary folding line L11 substantially coincides with the auxiliary folding line L10 of the second flat plate 11 when each connecting piece 13 is fixed to the second flat plate 11 .

<First side, second side, inward folding side>
The side plate 12 is partitioned into six regions by a pair of first elastic fold lines L5, a second elastic fold line L6, a pair of first partition lines L7, and a pair of second partition lines L8. Specifically, the side plate 12 is divided into a pair of first side portions 21 , a pair of second side portions 22 , and a pair of inwardly folded side portions 23 .

The pair of first side portions 21 are partitioned by the second elastic fold line L6 on one side in the step direction (depth direction) from the first partition line L7. The first side portion 21 adjacent to the first flat plate 10 is formed in a substantially trapezoidal shape, and the first side portion 21 adjacent to the connecting piece 13 is formed in a substantially parallelogram shape. The pair of second side portions 22 are partitioned by the second elastic fold line L6 on the other side in the row direction from the second partition line L8. The pair of second side portions 22 are formed in substantially triangular shapes that are line-symmetrical with each other with the second elastic fold line L6 as the axis of symmetry. The pair of inwardly folded side portions 23 are partitioned by a second elastic fold line L6 between a pair of first partition lines L7 and a pair of second partition lines L8. The pair of inwardly folded side portions 23 are formed in a substantially isosceles triangular shape that is symmetrical with each other with the second elastic fold line L6 as the axis of symmetry. The pair of inwardly folded side portions 23 are formed in a substantially rhombic shape as a whole.

The inwardly folded side portion 23 (first partition line L7, second partition line L8) is formed near one end (front side) of the side plate 12 in the step direction. As a specific example, the distance D1 from one end (front end) of the side plate 12 in the step direction to the intersection point P between the first elastic fold line L5 and the first partition line L7 is 1/1 of the total length D of the side plate 12 in the step direction. It is set slightly longer than 4. Note that the distance D1 is not limited to the above example, and is set in a range exceeding 1/4 and less than 1/2 of the total length D of the side plate 12 in the step direction (D/4<D1<D/2). good.

<Seal piece>
The sealing piece 14 is connected to one end (front end) of the first plane plate 10 in the direction of the stage. The sealing piece 14 has a front plate portion 31 and a laminated plate portion 32 .

(front plate)
The front plate portion 31 is formed in a substantially trapezoidal shape that narrows in the flow direction from the base end in the step direction toward the tip, and is connected to one end of the first plane plate 10 in the step direction via the second folding line L2. is set. Specifically, both sides of the front plate portion 31 in the flow direction are connected to a pair of first side portions 21 adjacent to the first plane plate 10, and the portion of the front plate portion 31 other than both sides in the flow direction is the first flat plate. is connected to the plane plate 10 of the . On both sides of the front plate portion 31 in the flow direction, a pair of folding pieces 31A are divided into substantially right-angled triangular shapes by folding lines L12 extending in the step direction. Each folded piece 31A is connected to the first side portion 21 adjacent to the first plane plate 10, and the oblique side of each folded piece 31A is the inclined side of the connecting piece 13 and the first side portion 21 adjacent thereto. form the same straight line.

(Laminate part)
The laminated plate portion 32 is connected to one end in the step direction of the front plate portion 31 excluding the pair of folding pieces 31A via a third folding line L3. The laminated plate portion 32 is formed in a polygonal shape that gradually narrows in the flow direction from the proximal end to the distal end. A joining piece portion 32A is formed in a substantially trapezoidal shape on the leading end side of the laminated plate portion 32 in the step direction. Two joining fold lines L13 extending in the flow direction are formed substantially parallel to each other on the joining piece portion 32A. A pair of unsealing lines 34 are formed in the vicinity of the center of the laminated plate portion 32 in the tier direction (the base end side in the tier direction relative to the joining piece portion 32A) with an unsealing strip 33 extending in the flow direction sandwiched therebetween. . Each opening line 34 is a so-called zipper in which a plurality of substantially L-shaped cuts are arranged side by side at intervals in the flow direction. A finger hooking hole 35 for hooking a user's finger is open at one end (right side in FIG. 3) of the tear strip 33 in the flow direction. In addition, the joint folding line L13 may be one, or may be omitted.

The auxiliary folding line L10, the second partition line L8, the auxiliary connecting folding line L11, the folding line L12, the third folding line L3, and the joining folding line L13 are general ruled lines formed by flattening the corrugated cardboard sheet in the thickness direction from the back liner 9C side. The first fold line L1, the first stretchable auxiliary fold line L9, the first stretch fold line L5, the second stretch fold line L6, and the second fold line L2 are lead creases in which a plurality of cuts are formed at predetermined intervals on general-purpose creases. The first partition line L7 is a reverse ruled line formed by flattening the corrugated cardboard sheet in the thickness direction from the front liner 9B side. The general-purpose creases and lead creases mainly have the function of folding (normally folding) the corrugated cardboard sheet so that the back liner 9C faces inward. The reverse crease mainly has the function of folding (reverse folding) the corrugated cardboard sheet so that the front liner 9B faces inward. The lines described above are not limited to general ruled lines, lead ruled lines, or reverse ruled lines, and may be perforated lines or any other structure that allows the corrugated cardboard sheet to be folded in a desired direction.

[Manufacturing of packaging boxes]
Next, manufacturing of the packaging box 1 will be described with reference to FIG. FIG. 4 is a perspective view showing the process of accommodating a thin package G in the packaging box 1. As shown in FIG. The packaging box 1 is manufactured by appropriately folding and adhering the blank 1A described above. As the adhesive, for example, a hot melt adhesive, a synthetic resin emulsion adhesive, a double-sided tape, or the like can be used.

Specifically, the second plane plate 11 is folded back (normally folded) along the first folding line L1 and placed on the back surface (back liner 9C) of the first plane plate 10 . In this state, the auxiliary folding lines L10 of the second flat plate 11 are overlapped so as to substantially match the auxiliary folding lines L10 of the first flat plate 10, and the pair of auxiliary folding lines L10 are curved so as to bulge forward. becomes a curve. The first expansion/contraction auxiliary folding line L9 overlaps the first expansion/contraction folding line L5 between the first plane plate 10 and each side plate 12 so as to substantially match.

Next, an adhesive is applied to the back surfaces of the pair of connecting pieces 13, the pair of side plates 12 are folded back (regularly folded) along the second elastic folding lines L6, and the pair of connecting pieces 13 are folded into the second flat shape. It is adhered to the left and right surfaces (front liner 9B) of the face plate 11 . As a result, each side plate 12 is connected to the second flat plate 11 via the connecting piece 13 and bridged between the pair of flat plates 10 and 11 . In this state, the first stretchable folding line L5 between the side plate 12 and the connecting piece 13 overlaps the first stretchable auxiliary folding line L9 so as to substantially match, and the first stretchable auxiliary folding line L9 is a part of the first stretchable folding line L5. Function. Each auxiliary side plate 15 overlaps the back surfaces of the first side portion 21 and the inwardly folded side portion 23 adjacent to the connecting piece 13 and forms part of the side plate 12 . Each connecting piece 13 is connected to the second plane plate 11 and becomes a part of the second plane plate 11 . The supplemental connecting fold line L11 of each connecting piece 13 overlaps the supplementary fold line L10 of the second flat plate 11 so as to substantially match the supplementary fold line L10 and functions as a part of the supplementary fold line L10.

As described above, the folded packaging box 1 is completed. The folded packaging box 1 (unsealed) has a form similar to the thin form F1 (sealed). In this state, the pair of flat plates 10 and 11 face each other in the vertical direction (thickness direction) across (or in contact with) the accommodation space S of the item to be packaged G, and the rear end (the other end in the depth direction) are connected with. An opening M is formed at the front ends of the pair of flat plates 10 and 11 for taking the package G in and out of the storage space S. As shown in FIG. The pair of side plates 12 are arranged on both left and right sides of the pair of plane plates 10 and 11 . Each side plate 12 is connected to a pair of plane plates 10 and 11 (one of the second plane plates 11) through a pair of first elastic fold lines L5 extending in the front-rear direction while being inclined to separate from each other as the opening M is approached. (including the connecting piece 13 which is a part). In other words, the pair of first elastic fold lines L5 are orthogonal to the second elastic fold lines L6, and the normal lines (not shown) extending from the second elastic fold lines L6 to the respective first elastic fold lines L5 have lengths corresponding to the openings. Each side plate 12 is installed between a pair of plane plates 10 and 11 via a pair of first expansion/contraction folding lines L5. When the pair of flat plates 10 and 11 come into contact with each other or come close to each other, each side plate 12 is in a bent form F3 that is positively folded along the second elastic fold line L6 so as to protrude outward in the left-right direction.

In the present specification, "when the pair of flat plates 10 and 11 are close to each other" means, for example, a state in which a thin package G such as a notebook can be accommodated between the pair of flat plates 10 and 11. do. Further, in this specification, the expression that each side plate 12 is "positively folded along the second expansion/contraction folding lines L6 so as to protrude outward in the left-right direction" means that the pair of first side portions 21 and the pair of second side portions 22 and the pair of inward-folded side portions 23 are double-folded, and in addition, they are also positively-folded at an angle of approximately 90 degrees or less. That is, in the side plate 12 in the bent form F3, the angle formed by the pair of first side portions 21 and the like is approximately 0 degrees or more and 90 degrees or less.

[Sealing the packaging box]
Next, with reference to FIGS. 1, 2, 4 to 7, the operation of sealing the packaging box 1 will be described. FIG. 5 is a perspective view showing the process of accommodating a thick package G in the packaging box 1. As shown in FIG. FIG. 6 is a perspective view showing the process of making the packaging box 1 into the thick form F2. FIG. 7 is a perspective view showing an enlarged part of the side plate 12 when the packaging box 1 is made into the thick form F2.

As already explained, the packaging box 1 can change its thickness when sealed according to the thickness (height) of the object G to be packaged.

<Thin form>
A description will be given of a case where a thin object to be packaged G is accommodated in the packaging box 1 and the packaging box 1 is made into the thin form F1. As shown in FIG. 4, the worker enters the thin package G from the opening M into the storage space S (between the pair of flat plates 10 and 11). The object G to be packaged is inserted into the accommodation space S while contacting the back surfaces of the pair of flat plates 10 and 11 . The pair of side plates 12 is maintained in the bent form F3, and the pair of flat plates 10 and 11 are separated (pushed apart) in the vertical direction by the thickness of the item to be packaged G, and slightly curved or folded at the flattened portion 16. bend Since the pair of plane plates 10 and 11 are connected to each other at their rear ends, they are inclined to approach each other at least behind the stepped portion 16 . Incidentally, when the object to be packaged G has a certain thickness, the pair of flat plates 10 and 11 are slightly curved or bent at the flattened portion 16, but when the object to be packaged G is very thin, The pair of plane plates 10 and 11 may not be bent at the flattened portion 16. - 特許庁

Next, the operator applies an adhesive to the back surface of the joining piece portion 32A, folds the front plate portion 31 forward along the second folding line L2, and folds the laminated plate portion 32 along the third folding line L3. It is normal-folded and overlaid on the surface of the second plane plate 11 (see FIG. 1). The front plate portion 31 of the sealing piece 14 closes the opening M, and the joining piece portion 32A is adhered to the surface of the second flat plate 11. As shown in FIG.

As described above, the packaging box 1 is sealed in the thin form F1 (see FIG. 1). The packaging box 1 in the thin form F1 has a plate shape that gradually increases in thickness from the rear to the front (opening M). For example, when the object to be packaged G is a very thin item such as a sheet of paper, the side plate 12 is double-folded (the angle formed by the pair of first side portions 21 is approximately 0 degrees). ), and the packaging box 1 becomes the thinnest and has a substantially flat plate shape. In this case, the front plate portion 31 may be folded back along the second folding line L2 to close the opening M and be stacked on the second plane plate 11, and the laminated plate portion 32 may not be folded along the third folding line L3. be.

<Thick form>
A case in which a thick object to be packaged G is accommodated in the packaging box 1 and the packaging box 1 is made into the thick form F2 will be described. Note that the following description will focus mainly on one side plate 12 .

As shown in FIG. 5, when an operator causes a thick object G to enter into the accommodation space S through the opening M, the pair of flat plates 10 and 11 are spread vertically by the incoming object G. It is bent or bent at the stepped portion 16 . When the pair of plane plates 10 and 11 are separated from each other, each side plate 12 assumes an elongated form F4 that is vertically elongated from the bent form F3.

In the present specification, "when the pair of plane plates 10 and 11 are separated" means that, for example, a thick package G such as a box-shaped packaged product can be accommodated between the pair of plane plates 10 and 11. means state. Further, in this specification, the expression that each side plate 12 is in the extended form F4 in which it is stretched in the vertical direction means that the pair of first side portions 21, the pair of second side portions 22, and the pair of inwardly folded side portions 23 are arranged substantially on the same plane, and a state in which the angle formed by the pair of first side portions 21 and the like is generally greater than 90 degrees (obtuse angle). That is, in the side plate 12 in the extended form F4, the angle formed by the pair of first side portions 21 and the like is approximately more than 90 degrees and 180 degrees or less. The packaging box 1 is thickest when the angle formed by the pair of first side portions 21 and the like is 180 degrees (the side plates 12 are in the upright posture). It should be noted that the range of the angle formed by the pair of first side portions 21 and the like in the bending form F3 or the extending form F4 described above is merely an example, and the range of the angle is not limited to this. You can change it.

Next, the operator pushes the pair of first side portions 21 of each side plate 12 into the housing space S, as shown in FIGS. At this time, the pair of folding pieces 31A of the sealing piece 14 are also folded inward while being forwardly folded along the folding lines L12. The pair of second side portions 22 of the side plate 12 is maintained in a state of being stretched in the vertical direction, and the pair of first side portions 21 are recessed inward in the left-right direction to form a pair of first partition line L7 and second elastic fold line L6. reverse-folded along the As the pair of first side portions 21 are pushed in, the pair of inwardly folded side portions 23 are also pulled into the accommodation space S. The pair of inwardly folded side portions 23 are reversely folded along the second elastic folding lines L6 and forwardly folded along the pair of second partition lines L8 to incline inward in the left-right direction. Further, the operator bends or bends the pair of plane plates 10 and 11 along the auxiliary folding line L10 so as to bring the pair of plane plates 10 and 11 closer to each other while pushing the pair of first side portions 21 so that the front ends of the pair of plane plates 10 and 11 are brought into contact with each other. Bring into contact or proximity. As a result, the opening M is narrowed (closed depending on the thickness of the package G).

Next, as in the case of making the packaging box 1 into the thin form F1 described above, the operator applies an adhesive to the back surface of the joining piece portion 32A, and folds the front plate portion 31 and the laminated plate portion 32 forward ( See Figure 2). The sealing piece 14 (joint piece portion 32A) closes the opening M and is adhered and fixed to the surface of the second flat plate 11 . In addition, it is preferable that the joint piece portion 32</b>A is adhered while being appropriately bent along the two joint folding lines L<b>13 along the second plane plate 11 .

As described above, the packaging box 1 is sealed in the thick form F2. The packaging box 1 in the thick form F2 has a box shape (pillow shape) in which the thickness gradually decreases from the central region in the front-rear direction (the region between the flattened portion 16 and the auxiliary folding line L10) toward both front and rear sides. becomes. Since the packaging box 1 in the thick form F2 has a shape in which the thickness (height) of both front and rear sides is narrowed, the first flat plate 10 and the second flat plate 11 are arranged on both upper and lower surfaces of the item G to be packaged. contact with pressure. As a result, the item to be packaged G is accommodated in the accommodation space S in a state where movement is restricted.

In the above description, the sealing piece 14 (joint piece portion 32A) is adhered to the surface of the second flat plate 11 via an adhesive. The sealing piece 14 may be fixed to the second plane plate 11 by means of adhesive tape applied to the surface (not shown).

When opening the sealed packaging box 1 , the user inserts fingers into the finger holes 35 to pinch the ends of the tear strip 33 , and cuts the tear strip 33 along the pair of tear lines 34 . As a result, the joining piece portion 32A is generally separated from the laminated plate portion 32, and the opening portion M can be opened by unfolding the sealing piece 14. As shown in FIG. A user takes out the package G accommodated in the accommodation space S through the opening M.

In the packaging box 1 according to the present embodiment described above, when each side plate 12 is in the extended form F4, the pair of second side portions 22 are maintained in a state of being extended in the thickness direction, and the pair of second side portions 22 are maintained in a state of being extended in the thickness direction. The first side portion 21 is reversely folded along a pair of the first partition line L7 and the second elastic fold line L6 so as to be recessed inward in the left-right direction, thereby narrowing the opening portion M. As shown in FIG. According to this configuration, even when the opening M is wide open with a thick package G stored therein, the opening M can be closed by narrowing a portion of the side plate 12 near the opening M. . Thereby, the shape of the packaging box 1 after sealing can be generally stabilized. In addition, since the packaging box 1 in the thick form F2 has a shape in which both the front and rear sides are narrowed, the object to be packaged G can be securely sandwiched between the pair of flat plates 10 and 11 . As a result, for example, movement of the object G housed in the packaging box 1 due to vibration or the like during transportation can be suppressed, and damage to the packaging box 1 and the object G to be packaged can be prevented.

If the inward folding side portion 23 (the second partition line L8) is omitted and the first side portion 21 and the second side portion 22 are directly connected, as the pair of first side portions 21 are folded, , a portion of each of the second side portions 22 is drawn inward while being normal-folded. At this time, a large force is required to fold the pair of first side portions 21 while partially pulling in the pair of second side portions 22 . In addition, since the position where each second side portion 22 is folded forward is unstable, the appearance after folding the pair of first side portions 21 is also poor. On the other hand, in the packaging box 1 according to the present embodiment, the inward folding side portion 23 connects the first side portion 21 and the second side portion 22, each side plate 12 is in the extended form F4, and the opening M When narrowing, the inward folding side portion 23 is forwardly folded with respect to the second side portion 22 , and the first side portion 21 is reversely folded with respect to the inward folding side portion 23 . According to this configuration, when folding the pair of first side portions 21, the inward folding side portions 23 can be forwardly folded at an easy and stable position. Also, the appearance after folding the pair of first side portions 21 can be improved.

Moreover, according to the packaging box 1 according to the present embodiment, the pair of first side portions 21 can be easily separated by setting the intersection point P between the first elastic fold line L5 and the first partition line L7 toward the front side of the side plate 12. can be folded into Thereby, the front portion of the side plate 12 can be properly narrowed down.

Further, according to the packaging box 1 according to the present embodiment, the pair of plane plates 10 and 11 are formed with auxiliary folding lines L10 for bending or bending the plane plates 10 and 11 when narrowing the opening M. Therefore, the pair of plane plates 10 and 11 can be easily bent along the auxiliary fold line L10 while folding the pair of first side portions 21. As shown in FIG. Thereby, the opening M can be easily closed.

In addition, in the packaging box 1 according to the present embodiment, the side plates 12 are connected to the first flat plate 10, but the present invention is not limited to this, and the side plates 12 may be connected to both the left and right ends of the second flat plate 11. good (not shown).

In addition, in the packaging box 1 according to the present embodiment, the sealing piece 14 is connected to the first flat plate 10, but it is not limited to this, and may be connected to the tip of the second flat plate 11. (not shown). Moreover, although the sealing piece 14 has the front plate portion 31 and the laminated plate portion 32, the front plate portion 31 may be omitted, and the laminated plate portion 32 may be either one of the pair of flat plates 10 and 11. (not shown).

Further, in the packaging box 1 according to the present embodiment, each connecting piece 13 is joined to the surface of the second flat plate 11, but this is not limiting, and may be joined to the back surface of the second flat plate 11. good (not shown).

Further, in the packaging box 1 according to the present embodiment, the opening M is closed by the sealing piece 14, but this is not limitative. may be fixed with an adhesive tape or the like (not shown).

[Modification]
Various modifications of the present embodiment will be described below. In the following description, the same or corresponding components as those of the packaging box 1 according to the present embodiment already described are denoted by the same reference numerals, and descriptions of the same or corresponding components as those of the packaging box 1 are omitted.

<First modification>
As shown in FIG. 8, in the blank 2A of the packaging box 2 according to the first modified example, the pair of side plates 12 are arranged at both ends of the first plane plate 10 in the flow direction (horizontal direction) via the first elastic fold line L5. connected to. A pair of split pieces 11D are connected to both ends (tips) of the pair of side plates 12 in the flow direction via first elastic fold lines L5. Each split piece 11D is formed with a substantially halved stepped portion 16 and an auxiliary folding line L10. A sealing piece 14 for closing the opening M is continuously provided at one end (front end) of the first plane plate 10 in the direction of the stage. A connecting piece 17 is connected to the other end (rear end) of the first plane plate 10 in the row direction via two fourth folding lines L4 (lead lines). The two fourth folding lines L4 extend substantially parallel to the flow direction, and the frame portion 18 is formed between the two fourth folding lines L4.

Although illustration is omitted, the packaging box 2 is manufactured by appropriately folding and adhering the blank 2A described above. Specifically, the pair of split pieces 11</b>D becomes the second plane plate 11 by being folded back along the second elastic fold line L<b>6 so as to face the first plane plate 10 . Specifically, the pair of split pieces 11D are folded back so that their tip ends are overlapped with each other, and the overlapped portions are connected (adhered) to be integrated (to form the second plane plate 11). The connecting piece 17 (frame portion 18) is folded back along the two fourth folding lines L4 and connected (bonded) to the second flat plate 11, thereby becoming a part of the second flat plate 11. .

According to the packaging box 2 according to the first modified example described above, it is possible to obtain the same functions and effects as the packaging box 1 described above, such as the ability to close the opening M by narrowing the side plate 12.

<Second modification>
As shown in FIG. 9, in the packaging box 3 (blank 3A) according to the second modification, the openings M are respectively opened on the front and rear sides of the pair of plane plates 10 and 11, and the packaging box 2 (blank 2A) ) in place of the connecting piece 17 (the frame portion 18), the sealing piece 14 is continuously provided. That is, a pair of sealing pieces 14 are continuously provided at both ends (front and rear ends) of the first plane plate 10 in the step direction.

The pair of first elastic fold lines L5 are inclined from the center in the row direction (front-rear direction) toward both ends (as the pair of openings M are approached) so as to separate from each other. The pair of first elastic fold lines L5 are bent in a substantially V-shape so that the centers in the row direction are brought closer to each other. The centers in the row direction of the pair of first elastic fold lines L5 are separated from each other (not in contact with each other). Each side plate 12 is formed in a polygonal shape in which the upper bases (short sides) of two trapezoids are butted against each other. On each side plate 12, two pairs of first partition lines L7 and two pairs of second partition lines L8 are formed so as to be symmetrical with respect to the center in the row direction. Thus, each side plate 12 has a pair of first side portions 21 and a pair of inwardly folded side portions 23 formed on both sides in the step direction. The pair of second side portions 22 are formed between two pairs of inwardly folded side portions 23 .

The first plane plate 10 is formed in a substantially hexagonal shape, and a pair of auxiliary folding lines L10 are formed on the first plane plate 10 so as to be symmetrical with the center in the step direction as a fulcrum (step crushed portion 16 are omitted). Similarly, a pair of split pieces 11D forming the second plane plate 11 are also formed with a pair of auxiliary folding lines L10 that are substantially halved.

According to the packaging box 3 according to the second modified example described above, the same functions and effects as those of the packaging box 1 described above, such as the ability to close the pair of openings M by narrowing the front and rear sides of the side plates 12, can be achieved. Obtainable.

In addition, as shown in FIG. 10, a pair of first elastic fold lines L5, two pairs of first partition lines L7 and two pairs of first partition lines L7, which are one of the features of the packaging box 3 (blank 3A) according to the second modification. The shape of the second partition line L8, the shape of the side plate 12, and the like may be applied to the packaging box 1 (blank 1A) (third modification). In this case, it is preferable to form a plurality of first folding lines L1 that serve as boundaries between the pair of plane plates 10 and 11 . As a result, the rear end of the packaging box 1 where the opening M is not present can be easily narrowed down in the vertical direction.

<Other Modifications>
In addition, in the packaging boxes 1 and 2 according to the present embodiment (including the first modification), the pair of first elastic folding lines L5 are formed in a substantially V shape that is inclined away from each other from the rear to the front. However, the invention is not limited to this. For example, the rear ends of the pair of first elastic fold lines L5 may be separated from each other, and the pair of first elastic fold lines L5 may be formed in a substantially V shape (not shown). In this case, the side plate 12 is formed in a substantially trapezoidal shape that gradually widens from the rear to the front (not shown).

In addition, in the packaging boxes 1 to 3 according to the present embodiment (including the first to third modifications; the same applies hereinafter), the pair of first elastic fold lines L5 are at substantially the same angle with respect to the second elastic fold lines L6. Although slanted, the invention is not so limited. The pair of first elastic fold lines L5 may be inclined at different angles with respect to the second elastic fold lines L6 (not shown). In this case, each first partition line L7 and each second partition line L8 may have different lengths and different inclination angles (not shown).

In addition, in the packaging boxes 1 to 3 according to the present embodiment, each first partition line L7 and each second partition line L8 are inclined at an angle of approximately 45 degrees with respect to the second elastic fold line L6, and a pair of inward folds Although the side portion 23 is formed in a substantially rhombic shape, the present invention is not limited to this. The inclination angle between each first partition line L7 and each second partition line L8 may be freely changed. Also, the pair of first partition lines L7 should be inclined so as to protrude toward the opening M, but the pair of second partition lines L8 are formed in a straight line in the flow direction (vertical direction in the sealed state). may be In other words, the pair of second partition lines L8 may be extended so as to bridge the intersection point P between the pair of first elastic fold lines L5 and the pair of first partition lines L7, and the angle and length thereof are I don't mind.

In addition, in the packaging boxes 1 to 3 according to the present embodiment, each first elastic fold line L5, each first partition line L7 and each second partition line L8 were formed in a straight line, but not limited to this, For example, it may be formed in a polygonal line shape by connecting a plurality of straight lines, may be formed in a curved line shape, or may be a combination of straight lines and curved lines (not shown). Also, the pair of second partition lines L8 (inward folding side portions 23) may be omitted. In this case, the pair of second side portions 22 of the side plate 12 are separated by the second elastic fold line L6 behind the first partition line L7.

Further, in the packaging boxes 1 to 3 according to the present embodiment, the flat plates 10 and 11 are formed with the auxiliary folding lines L10, but the present invention is not limited to this. The auxiliary folding line L10 may be formed only on one of the pair of plane plates 10 and 11 (not shown). In addition, although the auxiliary broken line L10 is curved in an arc shape, it is not limited to this. (not shown). Moreover, although the auxiliary folding line L10 is curved so as to swell in the direction away from the opening M, the present invention is not limited to this. For example, the auxiliary folding line L10 may be curved or bent (not shown) so as to bulge in a direction approaching the opening M. Although the pair of flat plates 10 and 11 are difficult to bend when bent in this manner, the packaging box 1 is easily stabilized when placed on a flat surface in the bent state, so that the swinging movement of the packaging box 1 can be regulated. Further, the auxiliary folding line L10 may be formed so as to cross the plane plates 10 and 11 in a straight line without curving (bending) (not shown). Furthermore, the configuration for bending the plane plates 10 and 11 is not limited to the auxiliary folding line L10. Another example of the weakened portion for bending or bending the flat plates 10 and 11 when narrowing the opening M may be a stepped region extending in the left-right direction (not shown). Further, the modified example of the auxiliary folding line L10 described above can be similarly applied to the stepped portion 16 formed on each of the plane plates 10 and 11. FIG. Furthermore, at least one of the stepped portion 16 and the auxiliary folding line L10 may be omitted.

In addition, the packaging boxes 1 to 3 according to the present embodiment are formed of double-sided corrugated cardboard sheets made of paper, but are not limited to this, single-sided corrugated cardboard sheets, double-sided corrugated cardboard sheets, thick paper, or resin plates ( sheet) or the like. Also, the dimensions (width, depth, height) and shape of each part of the packaging box 1, the thickness of the corrugated cardboard sheet, the direction in which the inner core 9A extends, etc. may be freely changed.

It should be noted that the description of the above 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. The technical scope of the present invention is not limited to the above embodiments. The present invention may be changed, replaced, and modified in various ways without departing from the spirit of the technical idea, and the scope of utility model registration includes all embodiments that can be included within the scope of the technical idea. .

1, 2, 3 packaging box 10, 11 plane plate 11D division piece 12 side plate 13, 17 connection piece 14 sealing piece 21 first side portion 22 second side portion 23 inward folding side portion F3 bent form F4 elongated form G object to be packaged L5 1st elastic fold line L6 2nd elastic fold line L7 1st partition line L8 2nd partition line L10 Auxiliary fold line (weakened part)
M Opening P Intersection S Storage space

Claims (7)

A packaging box (1 to 3) formed so that the thickness of an accommodation space (S) for accommodating an object (G) to be packaged can be changed,
a pair of flat plates (10, 11) facing each other in the thickness direction and having an opening (M) to the accommodation space in at least one of the depth directions;
The pair of flat plates are arranged on both sides in the width direction of the pair of flat plates, and extend in the depth direction while being inclined to separate from each other as the opening is approached. A pair of side plates (12) connected to
Each said side plate has:
a second elastic fold line (L6) extending along the depth direction between the pair of first elastic fold lines;
a pair of first partition lines (L7) extending from the pair of first elastic fold lines toward the second elastic fold line while being inclined in one direction in the depth direction,
each said side plate,
A pair of first side portions (21) partitioned by the second elastic fold line on one side in the depth direction from the pair of first partition lines;
a pair of second side portions (22) partitioned by the second elastic fold line on the other side in the depth direction from the pair of first partition lines,
When the pair of flat plates come into contact with each other or come close to each other, each of the side plates assumes a bent form (F3) that is positively folded along the second elastic fold line so as to protrude outward in the width direction,
When the pair of flat plates are separated, each of the side plates assumes an elongated form (F4) that is elongated in the thickness direction,
When each of the side plates is in the extended configuration, the pair of second side portions are maintained in a state of being extended in the thickness direction, and the pair of first side portions are recessed inward in the width direction. The packaging box is reverse-folded along the first partition line and the second elastic fold line to narrow the opening. Each side plate is formed with a pair of second partition lines (L8) extending so as to bridge between the intersection points (P) of the pair of first elastic fold lines and the pair of first partition lines,
The pair of second side portions are partitioned by the second elastic fold line on the other side in the depth direction from the pair of second partition lines,
Each of the side plates further has a pair of inwardly folded side portions (23) partitioned by the second elastic fold lines between the pair of first partition lines and the pair of second partition lines,
When each of the side plates is in the elongated configuration and the opening is narrowed, the pair of inwardly folded side portions are reversely folded along the second elastic fold lines and folded forward along the pair of second partition lines. 2. The packaging box according to claim 1, wherein the packaging box is folded and inclined inward in the width direction. The distance (D1) from one end of the side plate in the depth direction to the intersection point (P) of the first elastic fold line and the first partition line exceeds 1/4 of the total length (D) of the side plate in the depth direction, and less than 1/2. 4. A weakened portion (L10) for curving or bending the flat plate when narrowing the opening is formed in at least one of the pair of flat plates. 1. The packaging box according to item 1. The weakened portion is an auxiliary fold line (L10) extending so as to connect the intersections of the first elastic fold line and the first partition line located on both sides in the width direction,
5. The packaging box according to claim 4, wherein the auxiliary folding line is curved or bent so as to bulge out in one or the other of the depth directions. The pair of flat plates are arranged in series at the other end in the depth direction so as to face each other in the thickness direction,
The pair of side plates are connected to both ends in the width direction of either one of the pair of flat plates via the first elastic fold line,
A sealing piece (14) for closing the opening is continuously provided at one end in the depth direction of one of the pair of flat plates,
A pair of connecting pieces (13) are connected to both ends of the pair of side plates in the width direction via the first elastic fold line,
The pair of connecting pieces are connected to the other flat plate and form a part of the other flat plate in a state in which each of the side plates is bridged over the pair of the flat plates. Item 6. The packaging box according to any one of Items 1 to 5. The pair of side plates are connected to both ends in the width direction of either one of the pair of flat plates via the first elastic fold line,
A pair of split pieces (11D) are connected to both ends of the pair of side plates in the width direction via the first elastic fold line,
A sealing piece (14) for closing the opening is continuously provided at one end of one of the flat plates in the depth direction,
A connecting piece (17) is continuously provided at the other end in the depth direction of one of the flat plates,
The pair of split pieces are folded back so as to face one of the flat plates to form the other flat plate,
The packaging box according to any one of claims 1 to 5, wherein the connecting piece is folded back and connected to the other flat plate to form a part of the other flat plate.

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