Corrugated cardboard box and method for forming small corrugated cardboard box

Abstract

To provide a packaging box which does not impair an appearance itself, and can be easily resized into a packaging box with a small storage volume regardless of a configuration of a lid part.SOLUTION: A packaging box is provided with a horizontal cutting line 6 for cutting and separating a lower side part of a trunk part 2 at a predetermined position in a height direction of the trunk part 2, and is further provided with a folding line 7 above this horizontal cutting line 6. In the first packaging box form, the trunk part 2 is cut along the horizontal cutting line 6 to separate the lower side part of the trunk part 2 below the horizontal cutting line 6, and each corner edge 5 of the trunk part 2 is cut in a predetermined length so that a front side part 1a, a rear side part 1b, a left side part 1c and a right side part 1d of the trunk part 2 from which the lower side part is separated are folded inward along the folding line 7 to form a new bottom surface 10. As a result, the packaging box is configured to have a second packaging box form with a smaller storage volume than the first packaging box form.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention has a small storage volume. cardboard Can be transformed into a box shape cardboard Boxes and small items cardboard This relates to a method for forming a box. [Background technology]

[0002] In recent years, mail order sales using the Internet (so-called online shopping) have become widespread.

[0003] In this mail order business, packaging boxes such as cardboard boxes are essential for shipping products, and therefore retailers need to stock a large number of packaging boxes of various sizes to suit the size of the products to be shipped.

[0004] However, storing a large number of packaging boxes of various sizes requires a large storage space and is costly, so it is difficult for small privately run stores to store a large number of packaging boxes of various sizes.

[0005] However, if larger-sized packaging boxes are used for smaller products as well, cost issues arise, such as the need for more cushioning material and higher shipping costs.

[0006] To solve the above problems, resizable packaging boxes have been proposed in the past, as shown in Patent Documents 1 to 4. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-125237 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-107631 [Patent Document 3] Utility Model Registration No. 3124190 [Patent Document 4] Utility Model Registration No. 3120435 Summary of the Invention [Problem to be solved by the invention]

[0008] The conventional resizable packaging boxes shown in Patent Documents 1 to 4 (hereinafter referred to as "conventional examples") all have four flaps at the top opening, which close the top opening. In addition to a first fold line at the boundary between the flap and the side portion that allows the flap to bend, a second fold line is provided on the side portion below this first fold line, and cutting lines are provided at each corner edge that extend to the second fold line. After cutting along this cutting line, the side portion can be folded inward along the second fold line to lower the height of the side portion, so that the size can be changed to a packaging box with a smaller storage volume.

[0009] However, in the case of a conventional configuration, if the flaps that form the lid are cut, cut marks remain on the flaps, and these cut marks are noticeable when the lid is opened. Also, if the flaps that form the lid are not cut but are placed one on top of the other, the flaps may overlap, resulting in an unsightly appearance. Furthermore, the conventional configuration has the problem that it cannot be used for packaging boxes whose lid is formed from a single top surface (one outer flap).

[0010] The present invention has been made in consideration of the problems of the conventional example, and is intended to easily accommodate a small storage volume without spoiling the appearance and regardless of the configuration of the lid. cardboard Resizable box cardboard Boxes and small items cardboard The present invention provides a method for forming a box. [Means for solving the problem]

[0011] The gist of the present invention will be explained with reference to the accompanying drawings.

[0012] The first bag has a predetermined storage capacity and is made up of a rectangular frame-shaped body 2 formed by four side surfaces, a front side surface 1a, a rear side surface 1b, a left side surface 1c, and a right side surface 1d, a bottom surface 3 that closes the lower opening of the body 2, and a lid 4 that can be opened and closed freely. cardboard From the box shape, the first cardboard The second type has a smaller storage volume than the box type. cardboard Can be transformed into a box shape cardboard box wherein the The body portion 2 of the first corrugated cardboard box form has horizontal cutting lines 6, fold lines 7, and vertical cutting lines 8, the horizontal cutting lines 6 being perforations that are provided horizontally at a predetermined position in the height direction of the body portion 2 so as to go around the body portion 2 in the circumferential direction, the fold lines 7 being provided above the horizontal cutting lines 6 on the inner surface of the body portion 2 so as to go around the body portion 2 in the circumferential direction in parallel with the horizontal cutting lines 6, the distance between the horizontal cutting lines 6 and the fold lines 7 being set to half the length of the width of the left side surface portion 1c or the right side surface portion 1d, and the vertical cutting lines 8 being perforations that are provided between the rear side surface portion 1b and the left side surface portion 1c, and between the left side surface portion 1c and the front side surface portion 1d. the lid portion 4 is provided between the horizontal cutting line 6 and the folding line 7 of each corner edge 5 which is the connecting portion between the front side surface portion 1a and the right side surface portion 1d, and the connecting portion between the right side surface portion 1d and the rear side surface portion 1b; the lid portion 4 is composed of one outer flap portion 4a formed in a rectangular shape with the same size and shape as the upper opening of the body portion 2, and a pair of inner flap portions 4b which support the outer flap portion 4a; the outer flap portion 4a has an insertion piece 11 at its tip and a base end which is flexibly connected to the front side surface portion 1a or the rear side surface portion 1b; and one of the pair of inner flap portions 4b is flexibly connected to the left side surface portion 1c, and the other is flexibly connected to the right side surface portion 1d. The first cardboard In the box form, the body portion 2 is cut along the transverse cutting line 6. hand The portion of the body 2 below the transverse cutting line 6 The lower body portion 2b and the bottom surface portion 3 Separate The cut is made along the vertical cutting lines 8 on the corner edges 5 of the upper body portion 2a above the horizontal cutting line 6. Each corner edge 5 Turn off Decline The notch 9 is formed in the upper body portion 2a The front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d of Each of them, Fold inward along the folding line 7 The front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d are folded inward. New bottom Department 10, forming the second cardboard Box shape and can be The present invention is characterized in that it is configured as follows: cardboard box This relates to:

[0013] Furthermore, in the cardboard box described in claim 1, the folding lines 7 on the left side surface portion 1c and the right side surface portion 1d are arranged slightly higher in the height direction of the body portion 2 than the folding lines 7 on the front side surface portion 1a and the rear side surface portion 1b, and when the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d are folded inward, the left side surface portion 1c and the right side surface portion 1d are arranged above the front side surface portion 1a and the rear side surface portion 1b.

[0014] The bag also comprises a rectangular frame-shaped body 2 formed by four side surfaces, a front side surface 1a, a rear side surface 1b, a left side surface 1c, and a right side surface 1d, a bottom surface 3 that closes the lower opening of the body 2, and a lid 4 that closes the upper opening of the body 2 in an openable and closable manner. The trunk portion 2 has a horizontal cutting line 6 formed of a perforation that runs horizontally around the trunk portion 2 in the circumferential direction at a predetermined height position, a folding line 7 that runs around the trunk portion 2 in the circumferential direction above the horizontal cutting line 6 on the inner surface of the trunk portion 2, parallel to the horizontal cutting line 6 and spaced apart from the horizontal cutting line 6 by a distance that is half the width of the left side surface portion 1c or the right side surface portion 1d, and a folding line 7 that runs around the trunk portion 2 in the circumferential direction above the horizontal cutting line 6 and parallel to the horizontal cutting line 6 at a distance that is half the width of the left side surface portion 1c or the right side surface portion 1d. A vertical cutting line 8 consisting of a perforation is provided between the bending line 7 and the outer flap 4a. The lid 4 is made up of one outer flap 4a formed in a rectangular shape of the same size and shape as the upper opening of the body 2, and a pair of inner flap 4b supporting the outer flap 4a. The outer flap 4a has an insertion piece 11 at its tip and a base end that is flexibly connected to the front side surface 1a or the rear side surface 1b. One of the pair of inner flap 4b is flexibly connected to the left side surface 1c, and the other is flexibly connected to the right side surface 1d. First cardboard The box is made up of a rectangular frame-shaped body 2 formed by four side surfaces, namely a front side surface 1a, a rear side surface 1b, a left side surface 1c, and a right side surface 1d, and a lower opening of the body 2 is closed. New bottom section 10 and a lid portion 4 that closes the upper opening of the body portion 2 in an openable and closable manner, and cardboard A second storage volume smaller than the storage volume of the box. cardboard Small box-forming cardboard A method of forming a box, comprising: cardboard The body of the box 2 The body portion 2 is cut along the transverse cutting line 6. Then, the lower portion is cut and separated together with the bottom surface portion 3, and then the lower portion is cut and separated. and remain The body portion 2 The above Each corner edge 5 The corner edge 5 is cut along the vertical cutting line 8 provided at the Disconnect and forming a notch 9 in each corner edge 5. And then , the front of the body part 2 remaining after separating the lower part The front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d Along the folding line 7 Fold it inwards The aforementioned New bottom Department 10. cardboard The present invention relates to a method for forming a small corrugated cardboard box. [Effects of the Invention]

[0015] Since the present invention is configured as described above, the appearance is not marred by the exposure of the cut portion, and further, regardless of the configuration of the lid portion, the first cardboard From the box shape, this first cardboard The second type has a smaller storage volume than the box type. cardboard It is highly practical as it can be easily converted into a box shape. cardboard Boxes and small items cardboard This is how the box is formed. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is an explanatory plan view showing the state of a blank sheet in the present embodiment. [Figure 2] 1A and 1B are explanatory perspective views showing the first form of the cardboard box of this embodiment, in which FIG. 1A shows the state in which the top opening is open, and FIG. 1B shows the state in which the top opening is closed. [Figure 3] 10A and 10B are explanatory perspective views showing the second cardboard box form of this embodiment, in which (a) shows the state in which the top opening is open, and (b) shows the state in which the top opening is closed. [Figure 4] FIG. 2 is an explanatory plan view showing the product form (folded flat form) of the present embodiment. [Figure 5]1 is an explanatory perspective view showing the state in which the first cardboard box configuration of this embodiment is being changed to the second cardboard box configuration (the state in which the lower body portion and the bottom portion have been separated). FIG. [Figure 6] 1 is an explanatory perspective view showing the state in the middle of changing the shape from the first cardboard box shape to the second cardboard box shape of this embodiment (when the notch has been formed). FIG. [Figure 7] 1 is an explanatory perspective view showing the state in which the first cardboard box configuration of this embodiment is being changed to the second cardboard box configuration (when the bottom surface has been formed). FIG. [Figure 8] 1 is an explanatory perspective view showing the state in which the first cardboard box configuration of this embodiment is being changed to the second cardboard box configuration (with the lid portion formed). FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] A preferred embodiment of the present invention will be briefly described below, illustrating the operation of the present invention with reference to the drawings.

[0018] The body 2 is cut along the horizontal cutting lines 6 provided on the front side surface 1a, the rear side surface 1b, the left side surface 1c, and the right side surface 1d, respectively, and the lower part of the body 2 below the horizontal cutting lines 6 (hereinafter referred to as the "lower body portion 2b") is separated together with the bottom surface 3. The upper part of the body 2 from which the lower body portion 2b has been separated (hereinafter referred to as the "upper body portion 2a") is then cut into the front side surface 1a and the left side surface 1c, the left side surface 1c and the rear side surface 1b, Each corner edge 5, which is the connecting portion between the rear side surface portion 1b and the right side surface portion 1d and the right side surface portion 1d and the front side surface portion 1a, is cut to a predetermined length, and the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d of the upper body portion 2a are folded inward along the folding lines 7, so that the folded front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d become a new bottom surface 10 that closes the lower opening of the upper body portion 2a, and the first cardboard The second type has a lower body height and smaller storage capacity than the box type. cardboard It takes the form of a box.

[0019] Thus, the present invention provides the first cardboardThe lower body portion 2b in the box shape is cut and separated, and the lower sides of the front side surface 1a, rear side surface 1b, left side surface 1c and right side surface 1d of the upper body portion 2a are folded inward to form a new bottom surface 10. cardboard The second type has a lower body height and smaller storage capacity than the box type. cardboard Since the box shape is used, the cut portions cut along the horizontal cutting lines 6 and the cut portions of the corner edges 5 are not exposed when placed on the table and are not visible to the public, so the appearance is not marred.

[0020] Moreover, in the present invention, the lid portion 4 that closes the upper opening of the body portion 2 in an openable and closable manner is not modified and the structure is maintained. Therefore, regardless of the structure of the lid portion 4, the first cardboard The second type has a lower body height and smaller storage capacity than the box type. cardboard It can be in the form of a box. [Example]

[0021] Specific embodiments of the present invention will be described with reference to the drawings.

[0022] This embodiment is a first bag having a predetermined storage capacity, which includes a rectangular frame-shaped body 2 formed by four side surfaces, a front side surface 1a, a rear side surface 1b, a left side surface 1c, and a right side surface 1d, a bottom surface 3 that closes the lower opening of the body 2, and a lid 4 that can be opened and closed freely. cardboard From the box shape, the first cardboard The second type has a smaller storage volume than the box type. cardboard Can be transformed into a box shape cardboard A box, in which a horizontal cutting line 6 is provided on each of the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d, separating a lower portion of the body portion 2 from a predetermined position in the height direction, and further, a folding line 7 is provided above each of the horizontal cutting lines 6 on the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d, cardboardIn the box form, the body portion 2 is cut along the horizontal cutting line 6 to separate a lower portion of the body portion 2 below the horizontal cutting line 6, and each corner edge 5 that becomes a connecting portion between the front side surface portion 1a and the left side surface portion 1c, the left side surface portion 1c and the rear side surface portion 1b, the rear side surface portion 1b and the right side surface portion 1d, and the right side surface portion 1d and the front side surface portion 1a is cut to a predetermined length, and the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d of the body portion 2 from which the lower portion has been separated are folded inward along the folding line 7 to form a new bottom surface 10, thereby forming the second cardboard It is configured to have a box shape.

[0023] This embodiment will be specifically described below.

[0024] In this embodiment, the sheet shown in FIG. cardboard Blank sheet A is joined, folded and assembled into a cardboard cardboard The box, so-called cardboard box, is the first one shown in Figure 2. cardboard Box form (first cardboard From the box, this first cardboard The second type shown in Figure 3 has a smaller storage volume than the box type. cardboard Box form (second cardboard It is configured to be able to change its shape into a box. cardboard It's a box.

[0025] As shown in FIG. 1, the blank sheet A is cardboard It is configured with a front side portion 1a, a rear side portion 1b, a left side portion 1c and a right side portion 1d that form a box-shaped body portion 2, a first bottom forming portion 3a, a second bottom forming portion 3b, a third bottom forming portion 3c and a fourth bottom forming portion 3d that form the bottom portion 3, and an outer flap portion 4a and two inner flap portions 4b that form the lid portion 4.

[0026] Specifically, as shown in FIG. 1, the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d are connected in the order of rear side surface portion 1b, left side surface portion 1c, front side surface portion 1a, and right side surface portion 1d from one end side, and the rear side surface portion 1b and the left side surface portion 1c, the left side surface portion 1c and the front side surface portion 1a, and the front side surface portion 1a and the right side surface portion 1d are each connected in a flexible manner, and further, a body joint piece 12 that is joined to the right side surface portion 1d is provided in a flexible manner on the rear side surface portion 1b.

[0027] Furthermore, horizontal cutting lines 6 and folding lines 7 are provided on the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d, respectively.

[0028] The horizontal cutting lines 6 are perforations, and are provided in a horizontal straight line at predetermined positions in the height direction of the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d, specifically at predetermined positions below the center in the height direction. cardboard In the box form, the casing 2 is disposed so as to go around the body 2 in the circumferential direction.

[0029] The folding lines 7 are provided above the horizontal cutting lines 6 and parallel to the cutting lines 6 at predetermined intervals.

[0030] Specifically, the folding line 7 is provided at a distance equal to half the width of the left side surface portion 1c (right side surface portion 1d) from the horizontal cutting line 6, and the second cardboard In the box form, when the front side portion 1a and the rear side portion 1b are folded inward along this folding line 7, the front side portion 1a closes one half of the lower opening in the left-right direction, and the rear side portion 1b closes the other half.

[0031] The folding lines 7 on the rear side surface portion 1b and the right side surface portion 1d are provided slightly above the folding lines 7 on the front side surface portion 1a and the rear side surface portion 1b. This is to prevent the front side surface portion 1a and the rear side surface portion 1b from bulging outward when the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d are folded inward along the folding lines 7 so that the left side surface portion 1c and the right side surface portion 1d are disposed inside the front side surface portion 1a and the rear side surface portion 1b. cardboard This is to ensure that the bottom surface 10 of the box shape is formed flat.

[0032] In addition, the folding line 7 of this embodiment is the first cardboard The first cardboard It is box-shaped and cannot be seen from the outside.

[0033] Furthermore, the connecting portions between the rear side surface portion 1b and the left side surface portion 1c, the left side surface portion 1c and the front side surface portion 1a, the front side surface portion 1a and the right side surface portion 1d, and the rear side surface portion 1b and the joining piece 11 are provided with second connecting portions. cardboard In the box form, vertical cutting lines 8 are provided to form incisions 9 that allow the front side portion 1a, rear side portion 1b, left side portion 1c, and right side portion 1d to bend along folding lines 7.

[0034] Specifically, the vertical cutting lines 8 are formed as perforations similar to the cutting lines 6, and are provided from the horizontal cutting lines 6 to the folding lines 7.

[0035] Also, the first cardboard The first bottom surface forming portion 3a that forms the bottom surface portion 3 in the box shape is located at the lower side of the front side surface portion 1a (first cardboard The second bottom surface forming portion 3b is flexibly connected to the lower edge of the rear side surface portion 1b, the third bottom surface forming portion 3c is flexibly connected to the lower edge of the left side surface portion 1c, and the fourth bottom surface forming portion 3d is flexibly connected to the lower edge of the right side surface portion 1d.

[0036] Specifically, in the first bottom surface forming portion 3a, the second bottom surface forming portion 3b, the third bottom surface forming portion 3c and the fourth bottom surface forming portion 3d, the first bottom surface forming portion 3a and the second bottom surface forming portion 3b are formed in a congruent shape, and the third bottom surface forming portion 3c and the fourth bottom surface forming portion 3d are formed in a congruent shape.

[0037] In addition, the first bottom surface forming portion 3a and the second bottom surface forming portion 3b are provided with a bottom joining piece 13 that is connected and can be bent freely, and the bottom joining piece 13 of the first bottom surface forming portion 3a is joined to the third bottom surface forming portion 3c by an appropriate joining means, and the bottom joining piece 13 of the second bottom surface forming portion 3b is joined to the fourth bottom surface forming portion 3d by an appropriate joining means.

[0038] The outer flap portion 4a (main portion of the lid portion 4) forming the lid portion 4 is cardboard Box form and second cardboard The outer flap portion 4a is formed in the same rectangular shape as the upper opening so that the upper opening of the box can be closed by just this outer flap portion 4a.

[0039] Specifically, the outer flap portion 4a has an insertion piece 11 at its tip end, and a base end that is connected to the upper side of the rear side surface portion 1b (first cardboard Box form and second cardboard It is bendably connected to the edge of the upper opening of the box.

[0040] One of the inner flap portions 4b is bendably connected to the upper side of the left side portion 1c, and the other is bendably connected to the upper side of the right side portion 1d.

[0041] In this embodiment, the body joint piece 12 and the right side surface 1d, the bottom joint piece 13 of the first bottom surface forming portion 3a and the fourth bottom surface forming portion 3d, and the bottom joint piece 13 of the second bottom surface forming portion 3b and the third bottom surface forming portion 3c of the blank sheet A configured as described above are joined by appropriate joining means, and the folded flat form shown in FIG. 4 is formed by assembling by folding predetermined bending portions. By unfolding, folding, and assembling this folded flat form, a rectangular frame-shaped body portion 2 consisting of four side portions, front side surface 1a, rear side surface 1b, left side surface 1c, and right side surface 1d, as shown in FIG. 1, a bottom surface 3 that closes the lower opening of this body portion 2, and a lid portion 4 that can be opened and closed freely and that closes the upper opening of the body portion 2, is obtained. A horizontal cutting line (perforation) separating the lower portion of the body 2 (lower body portion 2b) is provided around the body 2 at a position below a predetermined center in the height direction of the body 2, and fold lines 7 are provided above the horizontal cutting line 6 at predetermined intervals. Also, vertical cutting lines 8 (perforations) are provided at each corner 5 that connects the front side portion 1a and the left side portion 1c, the left side portion 1c and the rear side portion 1b, the rear side portion 1b and the right side portion 1d, and the right side portion 1d and the front side portion 1a to form incisions 9 that enable the front side portion 1a, the rear side portion 1b, the left side portion 1c, and the right side portion 1d of the upper portion (upper body portion 2a) of the body 2 from which the lower body portion 2b has been separated to be bent along the fold lines 7. cardboard It takes the form of a box.

[0042] In addition, in this embodiment, this first cardboard In the box form, as shown in FIG. 5, the body 2 is cut along horizontal cutting lines 6 provided on the body 2, and the lower body portion 2b and the bottom portion 3 of this body 2 are separated. Next, as shown in FIG. 6, the corner edges 5 of the upper body portion 2a from which the lower body portion 2b has been separated are cut to a predetermined length along vertical cutting lines 8 provided on each corner edge 5, forming incisions 9 in each corner edge 5, and making the front side portion 1a, rear side portion 1b, left side portion 1c, and right side portion 1d of the upper body portion 2a each bendable along folding lines 7.

[0043] As shown in FIG. 7, the front side surface 1a, the rear side surface 1b, the left side surface 1c, and the right side surface 1d of the upper body portion 2a are folded inward along folding lines 7, respectively, to form a second bottom surface 10 as shown in FIG. 8. cardboard It takes the form of a box.

[0044] In this embodiment, the first cardboard From the box form to the second cardboard Although the case of changing the shape to a box shape has been described, this embodiment changes the shape from the folded flat shape shown in FIG. cardboard It can also be in the form of a box.

[0045] In this way, the present embodiment is cardboard The lower body portion 2b of the body portion 2 in the box shape is cut and separated, and the front side surface portion 1a, the rear side surface portion 1b, the left side surface portion 1c, and the right side surface portion 1d of the upper body portion 2a of the body portion 2 are folded inward along the folding line 7 to form a new bottom surface 10, and the first cardboard The second type has a lower body height and smaller storage capacity than the box type. cardboard Since the box shape is used, the cut portions cut along the horizontal cutting lines 6 and the incisions 9 formed by cutting along the vertical cutting lines 8 are not exposed when the product is placed on the table and are not visible to the public, so the product does not spoil its appearance.

[0046] Moreover, in this embodiment, the lid 4 that closes the upper opening of the body 2 in an openable and closable manner is left untouched, and the structure of the lid 4 is maintained (first cardboard Box form and second cardboard Therefore, regardless of the configuration of the lid portion 4, the first cardboard The second type has a lower body height and smaller storage capacity than the box type. cardboard It can be in the form of a box.

[0047] The present invention is not limited to the present embodiment, and the specific configuration of each component can be designed as appropriate. [Explanation of symbols]

[0048] 1a Front side 1b Rear side 1c Left side part 1d Right side part 2. Torso 2a Upper torso 2b Lower torso 3 Bottom part 4 Lid 4a Outer flap 4b Inner flap 5 Corner edge 6 Horizontal cutting line 7. Folding lines 8 Vertical cutting line 9 notch 10 New bottom section 11 Insert piece

Claims

1. A corrugated cardboard box which is changeable from a first cardboard box form having a predetermined storage capacity to a second cardboard box form having a storage capacity smaller than that of the first cardboard box form, and which has a rectangular frame-shaped body formed by four side surfaces, including a front side surface, a rear side surface, a left side surface, and a right side surface, a bottom surface that closes a lower opening of the body, and a lid that closes an upper opening of the body in an openable and closable manner, and in which horizontal cutting lines, folding lines, and vertical cutting lines are provided in the body of the first cardboard box form, and the horizontal cutting lines are perforations, and the body is horizontally cut at a predetermined position in the height direction of the body. the folding line is provided above the horizontal cutting line on the inner surface of the body portion so as to go around the body portion in the circumferential direction, parallel to the horizontal cutting line; the distance between the horizontal cutting line and the folding line is set to half the width of the left side surface portion or the right side surface portion; the vertical cutting line is a perforation; and the horizontal cutting line and the folding line of each corner edge that forms each connecting portion between the rear side surface portion and the left side surface portion, the left side surface portion and the front side surface portion, the front side surface portion and the right side surface portion, and the right side surface portion and the rear side surface portion are connected to each other. The lid portion is provided between the line, and the lid portion comprises one outer flap portion formed in a rectangular shape with the same size and shape as the upper opening of the body portion, and a pair of inner flap portions supporting the outer flap portion, and the outer flap portion has an insertion piece at its tip and a base end portion flexibly connected to the front side surface portion or the rear side surface portion, and one of the pair of inner flap portions is flexibly connected to the left side surface portion and the other is flexibly connected to the right side surface portion, and in the first corrugated board box form, the body portion is cut along the lateral cutting line to remove the lateral cut of the body portion. a corrugated cardboard box configured to separate the lower body portion and the bottom portion below the horizontal cutting line, cut each of the corner edges of the upper body portion above the horizontal cutting line along the vertical cutting lines to form incisions, fold the front side portion, rear side portion, left side portion, and right side portion of the upper body portion inward along the folding lines, and form a new bottom portion using the folded inward front side portion, rear side portion, left side portion, and right side portion.

2. A cardboard box as described in claim 1, wherein the fold lines on the left side and right side are arranged slightly above the height of the body relative to the fold lines on the front and rear side, and when the front, rear, left and right side are folded inward, the left and right side are arranged above the front and rear side.

3. The bag comprises a rectangular frame-shaped body portion formed by four side surfaces, namely a front side surface portion, a rear side surface portion, a left side surface portion, and a right side surface portion, a bottom surface portion that closes the lower opening of the body portion, and a lid portion that closes the upper opening of the body portion in an openable and closable manner. The body portion has a horizontal cutting line formed by a perforation that runs around the body portion in a circumferential direction horizontally at a predetermined position in the height direction, a folding line that runs around the body portion in a circumferential direction parallel to the horizontal cutting line on the inner surface of the body portion above the horizontal cutting line and spaced apart by a length that is half the width dimension of the left side surface portion or the right side surface portion, and a folding line that runs around the body portion in a circumferential direction parallel to the horizontal cutting line on the inner surface of the body portion above the horizontal cutting line. The lid portion is provided with a vertical cutting line formed by a perforation extending between the horizontal cutting line and the folding line at each corner edge that is a connecting portion of the left side surface portion, the left side surface portion and the front side surface portion, the front side surface portion and the right side surface portion, and the right side surface portion and the rear side surface portion, and the lid portion is made up of a single outer flap portion formed in a rectangular shape with the same size and shape as the upper opening of the body portion, and a pair of inner flap portions that support the outer flap portion, and the outer flap portion is provided with an insertion piece at its tip and a base end that is bendably connected to the front side surface portion or the rear side surface portion, and The flap portions are configured such that one is flexibly connected to the left side surface portion and the other is flexibly connected to the right side surface portion, and a second corrugated board box having a storage volume smaller than that of the first corrugated board box is formed from a first corrugated board box having the above-described structure, the second corrugated board box comprising a rectangular frame-shaped body portion formed by four side surfaces, namely a front side surface portion, a rear side surface portion, a left side surface portion, and a right side surface portion, a new bottom surface portion that closes a lower opening of the body portion, and a lid portion that can be opened and closed and closed. the body portion is cut along the horizontal cutting lines to cut and separate a lower portion from the horizontal cutting lines together with the bottom portion, the lower portion is cut and separated, and the remaining corner edges of the body portion are cut along the vertical cutting lines to form notches in each corner edge, and the lower portion is separated, and the front side portion, the rear side portion, the left side portion, and the right side portion of the remaining body portion are folded inward along the folding lines to form the new bottom portion, thereby forming the second cardboard box.

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