JP6110108B2 - Sheet for cardboard box, cardboard box and method for sealing confidential waste paper - Google Patents

Description

  The present invention relates to a corrugated cardboard sheet, a corrugated cardboard box, and a method for sealing confidential used paper using the corrugated cardboard box.

  Conventionally, confidential waste paper such as confidential materials containing highly confidential information such as accounting information, customer information, technical information, etc. is stored for a certain period and then sealed in a cardboard box for confidential waste paper. (See JP 2010-84262 A).

  As such a corrugated cardboard box for confidential used paper, for example, a packaging box that has already been used, such as a cardboard box in which copy paper is packaged, is generally reused. For such reuse, when a certain amount or less of confidential waste paper is put into the confidential waste paper cardboard box, the confidential waste paper is used to put the confidential waste paper into the empty space in the confidential waste paper cardboard box. It is stored with the flap closed without sealing the cardboard box. However, if the flap is only closed, the flap may be inadvertently opened. If the flap is inadvertently opened, the confidential used paper in the confidential used cardboard box may be scattered by wind or the like. .

JP 2010-84262 A

  The present invention has been made in view of such inconveniences. A sheet for a corrugated cardboard box, a corrugated cardboard box, and a corrugated cardboard box capable of storing input such as confidential waste paper easily and reliably before sealing. It aims at providing the used confidential paper sealing method.

The invention made to solve the above problems is
A square tubular portion in which the first side wall, the bottom plate, the second side wall, the top plate and the glue margin portion are arranged in this order;
A pair of upper outer flaps extending from each edge of the top plate;
A pair of lower outer flaps extending from each edge of the bottom plate;
A sheet for a cardboard box comprising a single sheet comprising two pairs of inner flaps extending from each edge of each side wall,
A first break guide line provided along the circumferential direction of the rectangular tubular portion from the leading edge of the glue margin to the second side wall on the glue margin and the top surface,
A second breakage guide line provided on one of the upper outer flaps to form an engagement portion by being broken;
A corrugated cardboard box sheet comprising: a third break guide wire which is provided on one of the inner flaps and which is broken to form an engaged portion that can be engaged with and disengaged from the engaging portion.

  The corrugated cardboard box in which the sheet for corrugated cardboard box is assembled is capable of opening a part of the top surface portion by breaking the adhesive margin portion and the top surface plate along the first breaking guide line. Etc. can be put inside. In this way, after putting confidential waste paper or the like inside, the top plate is closed, and the engagement part and the engaged part formed by breaking along the second break guide line and the third break guide line are engaged. By doing so, it is possible to accurately and easily prevent the closed top panel from being inadvertently opened. Further, by releasing the engagement state between the engagement portion and the engaged portion and reopening the top plate, the confidential waste paper or the like can be reintroduced into the inside from this open portion. Thus, a part of the top plate can be reliably closed by engaging the engaging portion and the engaged portion. For this reason, it is possible to easily and reliably store the input such as confidential waste paper in the cardboard box sheet until it is sealed. Further, the cardboard box can be easily maintained in strength by opening only a part of the top surface as described above and leaving the other part of the top surface as it is.

  The first break guide wire may be provided near the other end edge. Accordingly, by opening the portion on the other side of the first break guide line of the top plate, a wide open portion can be obtained, and the confidential waste paper can be easily and reliably input.

  The distance from the other edge of the first break guide line may be 0.15 times to 0.4 times the distance from the one edge to the other edge of the top plate. As a result, it is possible to easily put confidential waste paper from the open portion formed by breaking along the first break guide line, and for the corrugated cardboard box even if it breaks along the first break guide line as described above The strength of the sheet can be kept sufficiently.

  The leading edge of the glue margin is substantially straight and substantially parallel to the connection portion with the top surface portion, and the pair of side edges of the glue margin portion are the end portions of the connection portion with the top plate. Extending toward the leading edge and continuing to the leading edge, and the continuous position of the one side edge with the leading edge is different from the leading edge of the other side edge. It is good to be located in the center side of a front-end edge rather than a continuous position. Thereby, after opening a part of the top plate by breaking along the first break guide line as described above, the glue margin portion extending along a part of the top plate (along the first break guide line) When the top plate is closed while inserting the part of the glue margin cut in this way inside the side wall, the continuous position of the one edge and the tip edge is located on the center side of the tip edge. By doing so, it is possible to easily and surely insert the margin part into the inside of the first side wall.

  A pair of second break guide lines may be provided on one upper outer flap, and a third break guide line may be provided on each of the pair of inner flaps extending from the first side wall and the second side wall. Thereby, when a part of the top plate is closed as described above, the closed state of the top plate can be more reliably maintained by the engagement between the two pairs of the engaging portions and the engaged portions.

  Moreover, the invention made | formed in order to solve the said subject is a cardboard box comprised by assembling the said sheet | seat for cardboard boxes which consists of the said structure. The cardboard box can store the input such as confidential waste paper easily and surely until it is sealed as described above, and only a part of the top surface is opened and the other part of the top surface is By keeping the state as it is, the strength of the cardboard box is easily maintained.

The invention made to solve the above problems is
A step of opening a part of the top surface portion of the corrugated cardboard box having the above-mentioned configuration in which the product is packaged by breaking the adhesive margin portion and the top surface plate along the first break guide line,
A step of taking out the product from the corrugated cardboard box in which a part of the top surface is opened,
Storing confidential waste paper in the cardboard box from which the product has been removed;
A process for sealing the corrugated cardboard box that has been used to store confidential waste paper,
In the process of storing the above confidential waste paper,
A procedure for putting confidential waste paper into the cardboard box;
Closing the top plate after the procedure of putting the confidential waste paper, and engaging the engaging portion and the non-engaging portion formed by breaking along the second break guide line and the third break guide line;
This is a method for sealing confidential used paper that repeats the steps of releasing the engagement between the engaged portion and the non-engaged portion and opening the top plate.

  According to the method for sealing confidential used paper, it is possible to put confidential used paper into the corrugated cardboard box by opening and closing a part of the top plate as described above, and by engaging the engaging portion and the engaged portion, Since the section can be easily and surely closed, the confidential waste paper can be stored in the cardboard box easily and reliably before sealing.

  As described above, the sheet for cardboard boxes, the cardboard box, and the confidential used paper sealing method using the cardboard box according to the present invention can easily and reliably store the input such as the confidential used paper until it is sealed. it can.

It is a top view which shows the sheet | seat for corrugated cardboard boxes for confidential used paper concerning one Embodiment of this invention (it is an expanded view of a cardboard box). It is a perspective view which shows the packing form of the corrugated cardboard box for confidential used paper of FIG. It is a perspective view which shows the state which opened the corrugated cardboard box for confidential used paper of FIG. 1, and took out the goods inside. It is a perspective view which shows the state which closed a part of top | upper surface board of the corrugated cardboard box for confidential used paper of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Sheet for cardboard boxes and cardboard boxes]
The corrugated cardboard box 1 for confidential used paper shown in FIGS. 2 to 4 (hereinafter sometimes simply referred to as “cardboard box”) is constructed by assembling the cardboard box sheet 1 shown in FIG. This corrugated cardboard box sheet 1 includes a rectangular tubular portion 10 in which a first side wall 11, a bottom surface plate 12, a second side wall 13, a top surface plate 14 and a glue margin portion 15 are arranged in this order, and A pair of upper outer flaps 20 extending from each edge, a pair of lower outer flaps 30 extending from each edge of the bottom plate 12, and each edge of each of the side walls 11, 13 are extended. Two pairs of inner flaps 40 are provided.

  The cardboard box 1 is formed in a rectangular parallelepiped shape in a sealed state, and is formed using a single cardboard sheet having a uniform thickness. In the cardboard box 1, merchandise is stored in a sealed state. Here, the size of the corrugated cardboard box 1 is not particularly limited, and is appropriately set in consideration of the size of the product as the contents. For example, when the contents are a package in which paper such as copy paper is packaged, the size of the cardboard box 1 is 29 cm to 31 cm in width (inner dimensions) and 41 cm to 43 cm in depth (inner dimensions). Thus, a paper package of A4 size or A3 size can be accurately accommodated. The size of the cardboard box 1 is 25 cm or more and 27 cm or less in width (inner dimension) and 35 cm or more and 37 cm or less in depth (inner dimension), so that a B5 size or B4 size paper package can be accurately accommodated. Can do. In any of these cases, the height (inner dimension) of the cardboard box 1 can be set as appropriate. The width of the cardboard box 1 corresponds to the width of the top plate 14 and the bottom plate, the depth corresponds to the axial length of the rectangular tubular portion 10, and the height corresponds to the first side wall 11 and the second side wall 11. This corresponds to the width of the side wall 13. In addition, each internal dimension means the magnitude | size of an internal storage space part in the state (box state) formed in the rectangular parallelepiped shape.

  Further, the corrugated cardboard box 1 includes a continuous portion of the constituent portions of the rectangular cylindrical portion 10 (the first side wall 11, the bottom surface plate 12, the second side wall 13, the top surface plate 14, and the adhesive margin portion 15), and each flap 20, The folds for easy folding are formed at the end edges of the above-described constituent parts from which 30 and 40 are extended, and the thin lines in the developed view of the cardboard box 1 in FIG. As the crease, ruled line processing can be adopted.

  The top plate 14 and the bottom plate 12 have a rectangular shape of the same type and the same size. The first side wall 11 and the second side wall 13 also have a rectangular shape of the same type and the same size. Further, the top plate 14, the bottom plate 12, the first side wall 11 and the second side wall 13 have the same length in one direction (depth direction), and the rectangular cylindrical portion 10 having a rectangular parallelepiped shape is formed by these surface walls.

  The margin part 15 has a substantially rectangular shape. The glue margin 15 has a length in one direction substantially equal to the top plate 14 and the like, and the width is smaller than the width of the first side wall 11 and the second side wall 13, for example, 0.1 times or more 0.2 It is provided about twice or less. The margin part 15 is provided in a substantially linear shape with a leading edge 15a substantially parallel to a portion where the top edge plate 14 is continuously provided. And a pair of side edge of the said margin part 15 extends toward the front-end | tip edge 15a from the edge part (edge part vicinity) of the connection part with the said top | upper surface board 14, respectively, and follows the said front-end | tip edge 15a. It is provided as follows. The continuous position 15b of the side edge of one of the pair of side edges (the side on which the second break guide line 3 and the third break guide line 4 to be described later are formed) with the tip edge 15a is the other side. The end edge is located on the center side of the continuous position 15c with the tip edge 15a. That is, the margin portion 15 has a shape in which each tip corner portion is rounded off, and the one tip corner portion is provided with a larger curvature than the other tip corner portion. More specifically, the one side edge is provided so as to extend toward the tip edge 15a while being inclined from the end of the connection portion with the top plate 14 toward the center and to be continuous with the tip edge 15a. The other side edge extends from the end portion of the connection portion with the top plate 14 in a direction orthogonal to the connection portion, and is curved in a round shape near the tip edge 15a while the tip end. It is provided to be continuous with the edge 15a.

  As described above, the top plate 14 has the second side wall 13 continuously provided on one side edge thereof, and the adhesive margin 15 is provided on the side edge opposite to the side on which the second side wall 13 is provided continuously. ing. The bottom plate 12 has the first side wall 11 and the second side wall 13 connected to each side edge as described above. In the corrugated cardboard box 1, the rectangular cylindrical portion 10 is provided in a cylindrical shape by joining the first side wall 11 and the adhesive margin portion 15.

  In the corrugated cardboard box 1, the rectangular tubular portion 10 is provided in a cylindrical shape as described above, and then the four inner flaps 40 are folded toward the inner side of the rectangular tubular portion 10 at substantially right angles, and the two upper outer flaps 20. And the two opposing side surface portions can be formed by folding the two lower outer flaps 30 toward the inside of the rectangular tubular portion 10 so as to overlap the inner flap 40, respectively. At this time, by bonding the inner surfaces of the upper outer flap 20 and the lower outer flap 30 to the outer surface of the inner flap 40 with an adhesive or the like, the side surface portions are fixed, and the sealed state of the cardboard box 1 is completed.

  Each of the flaps 20, 30, 40 is formed in a substantially square shape. The height of the upper outer flap 20 and the lower outer flap 30 (vertical length in the box state) is substantially half of the width of the inner flap 40 (lateral length in the box state). These flaps are fixed so that the end edge of the outer flap 20 and the end edge of the lower outer flap 30 are brought into contact with each other so that there is no substantial gap.

  The procedure for packing the product with the cardboard box sheet 1 can be performed, for example, as follows. First, the product to be packaged is placed on the bottom plate 12 in the unfolded state, and the continuous portions of the top plate 14, the bottom plate 12, the first side wall 11 and the second side wall 13 are bent, and the adhesive margin 15 is moved to the first position. A rectangular tubular portion 10 that is joined to one side wall 11 and surrounds a product is formed. Next, the upper outer flap 20, the lower outer flap 30, and the inner flap 40 are folded as described above to form side portions, whereby the packaging of the product in the cardboard box 1 is completed.

  The corrugated cardboard sheet constituting the corrugated cardboard box sheet 1 includes a core formed in a corrugated shape, a front liner and a back surface laminated on the front side of the core from the viewpoint of high strength and ease of processing and molding. Double-sided cardboard with a back liner laminated on the side is used. The circumferential direction of the rectangular tubular portion 10 and the corrugated direction of the corrugated cardboard sheet (the direction along the center ridge line) are arranged in parallel.

  The corrugated cardboard box 1 is provided with a first breaking guide provided on the margin portion 15 and the top plate 14 along the circumferential direction of the rectangular tubular portion 10 from the leading edge 15a of the margin portion 15 toward the second side wall 13. Line 2 is provided. Specifically, the first break guide line 2 has a leading edge 15a of the margin portion 15 as a starting point and a connecting portion with the second side wall 13 of the top plate 14 as an end point. In addition, the first break guide line 2 is substantially parallel to the edge of the top plate 14 (the edge from which the upper outer flap 20 extends) in the unfolded state, and the side surface portion configured by the flaps in the box state. It is almost parallel to.

  The first break guide line 2 is provided not near the center in the depth direction of the top plate 14 but near the other edge (the side where the second break guide line 2 and the third break guide line 3 described later are not formed). It has been. Specifically, the first break guide line 2 is formed at a position of about 32 cm from one end edge and about 11 cm from the other end edge. Here, the first break guide line 2 has a distance from the other edge of 0.15 times to 0.4 times the depth of the top plate 14 (the distance from one edge to the other edge). It is preferable that it is within 0.2, and more preferably 0.2 times or more and 0.3 times or less. When the distance from one edge of the first break guide wire 2 exceeds the upper limit, the first break guide wire 2 is broken to open a part of the top plate 14 as described later. There is a risk that the open part cannot be made sufficiently wide. On the other hand, when the distance of the first break guide line 2 is less than the lower limit value, the glue margin that maintains the joined state with the first side wall 11 when part of the top plate 14 is opened as described above. There is a possibility that the bonding strength of the portion 15 is lacking.

  Further, the corrugated cardboard box 1 is provided on the upper outer flap 20 and is provided on the inner flap 40 by breaking the second break guide wire 3 that forms the engaging portion 21 by being broken. And a third break guide wire that forms an engaged portion 41 that can be engaged with and disengaged from the engaging portion 21. A pair of the second break guide lines 3 is provided on the upper outer flap 20 on one side of the pair of upper outer flaps 20. Further, the third break guide wire 4 is provided on each of the pair of inner flaps 40 extending from the first side wall 11 and the second side wall 13 to the other side. Here, the second break guide wire 3 and the third break guide wire 4 are provided at positions facing each other when assembled in a box state, and the engaging portion 21 and the engaged portion 41 formed for this purpose are provided. Can be engaged with each other.

  One of the engaging portion 21 and the engaged portion 41 is formed as a perforation, and the other is formed as a protrusion that can be engaged with and disengaged from the perforation. And the engaged state of the engaged portion 41 is obtained. Specifically, the engaging portion 21 formed on the upper outer flap 20 along the second break guide line 3 is formed as a perforation, and is formed on the inner flap 40 along the third break guide line 4. The engaged portion 41 is formed as a protrusion.

  The engaging portion 21 and the engaged portion 41 are formed at positions different from the gluing positions of the upper outer flap 20 and the inner flap 40 in the sealed state. Specifically, in the sealed state, the upper outer flap 20 and the inner flap 40 are glued in the vicinity of the upper and lower ends of the upper outer flap 20, and the perforation 21 is formed near the center in the vertical direction of the upper outer flap 20. Has been. Further, the protrusion 41 is formed in the vicinity of the center in the vertical direction of the upper portion of the inner flap 40 (information area when divided into two upper and lower areas).

  The perforation 21 is composed of a long hole formed along the vertical direction. The protrusion 41 includes a shaft portion 42 having the same width or slightly smaller than the width (length in the longitudinal direction) of the perforation 21, and a protrusion 43 extending from the shaft portion 42 and having a maximum width wider than the shaft portion 42. have. The protrusion 43 can penetrate into and out of the long hole and has a maximum width that is the same as or slightly larger than the width of the perforation 21.

  Further, the protrusion 41 has a step formed between the protrusion 43 and the shaft portion 42, and when the peripheral edge of the perforation 21 is caught on the step in the engaged state, The engagement is not inadvertently released, and the engaged state is more reliably maintained.

  Furthermore, the protrusion 43 of the protrusion 41 is formed in a shape in which the width of the edge on the protrusion side becomes narrower in the protrusion direction. Specifically, the protruding edge of the protrusion 43 is formed in an arc shape. For this reason, when engaging the engaging portion 21 and the engaged portion 41, the protrusion 41 can easily penetrate the perforation 21.

  Further, the shaft portion 42 is formed with a ruled line 42a for easily bending the protrusion 41 when engaged with the perforation 21 (see FIG. 1). The ruled line 42a is provided substantially in parallel with the part provided with the first side wall 11 (ruled line), and the distance between the ruled line 42a and the part provided with the first side wall 11 is about the thickness of the cardboard sheet. .

  The first break guide line 2, the second break guide line 3, and the third break guide line 4 can be provided by subjecting the corrugated cardboard sheet to perforation or half-cut processing. It is possible to adopt an easily breakable line that has been subjected to half-cut processing or a normal breakline that has been only perforated. The perforation process is to form cut parts (perforations) that penetrate from the front surface to the back surface of the corrugated cardboard sheet at regular intervals, and the half cut process cuts one of the liners constituting the corrugated cardboard sheet. The easily breakable portion can be formed by forming a perforation and cutting either the front or back liner so as to connect the perforation.

  The corrugated cardboard box 1 has an arcuate cutout at the center of the edges of the upper outer flap 20 and the lower outer flap 30. The notch is formed in a size that allows a finger to be inserted, and the top plate 14 can be easily opened by inserting the finger and gripping the upper outer flap 20 at the time of opening or the like.

[Method of sealing confidential waste paper using the cardboard box]
Next, a method for using the cardboard box 1 will be described.

  As described above, the cardboard box 1 can pack products as shown in FIG. 2 in the same manner as a normal wrap-round cardboard box. The corrugated cardboard box 1 breaks the adhesive margin 15 and the top plate 14 along the first breaking guide line 2 to thereby remove the top plate 14 (and the adhesive margin 15 and the upper outer flap 20 connected to the top plate 14). Can be opened and opened. And a product can be taken out from the open part by which the top plate 14 was opened in this way.

  Then, as shown in FIG. 3, the confidential used paper can be stored in the cardboard box 1 from which the product is taken out. In this accommodation, first, the engaging portion 21 and the engaged portion 41 are formed by breaking the upper outer flap 20 and the inner flap 40 along the second break guide line and the third break guide line. Then, after the procedure of putting confidential waste paper into the cardboard box 1 and the procedure of putting confidential waste paper, the top plate 14 (and the glue margin 15 and the upper outer flap 20 connected thereto) are closed, and FIG. A procedure for engaging the engaging portion 21 and the non-engaging portion 21 as shown, and a procedure for releasing the engagement of the engaged engaging portion 21 and the non-engaging portion 21 and opening the top plate 14. Is repeated. When the top plate 14 is closed as described above, the margin portion 15 is inserted inside the first side wall 11 (see FIG. 3). When engaging the engaging portion 21 and the engaged portion 41, first, the top plate 14 is closed with the protrusion 41 standing, and then the protrusion 41 is bent and inserted into the perforation 21 from the outside. The protrusion 41 and the perforation 21 are engaged.

  As described above, after the confidential waste paper is stored and the confidential waste paper is filled in the cardboard box 1, the top plate 14 is closed and the cardboard box 1 is sealed. Specifically, the sealing is performed by fixing the top plate 14 so as not to open using an adhesive tape. At the time of sealing, the top plate 14 can be closed so that the glue margin 15 is positioned outside the first side wall 11, and the engaging portion 21 and the engaged portion 41 can be engaged. You don't have to.

[advantage]
The corrugated cardboard box 1 can accurately and easily prevent the closed top panel 14 from being inadvertently opened by engaging the engaging portion 21 and the engaged portion 41. Further, by releasing the engagement state between the engagement portion 21 and the engaged portion 41 and reopening the top plate 14, the confidential waste paper can be reintroduced into the inside from this open portion, and further after the completion of the insertion As described above, a part of the top plate 14 can be reliably closed by engaging the engaging portion 21 and the engaged portion 41. For this reason, it is possible to store confidential waste paper in the cardboard box 1 easily and reliably before sealing.

  Moreover, since the cardboard box 1 is in a state in which only a part of the top plate 14 is opened and the other part of the top plate 14 is joined to the first side wall 11 as it is, the cardboard box 1 can be opened. It has sufficient strength.

  In addition, since the first break guide wire 2 is provided near the other end edge, a wide open portion can be obtained by opening a portion on one side of the top plate 14 from the first break guide wire 2, Confidential waste paper can be input easily and reliably.

  In addition, the margin portion 15 is such that the continuous position 15b of the one side edge with the tip edge 15a is located closer to the center than the continuous position 15c of the other side edge with the tip edge 15a. Therefore, when the top plate 14 is closed as described above, it is easy to close the top plate 14 while inserting the adhesive margin 15 inside the first side wall 11. That is, since the continuous position 15b between the one side edge and the tip edge 15a is located on the center side as described above, first, the tip edge 15a of the glue margin 15 provided continuously to a part of the top plate 14 is used. Easily enters the inside of the first side wall 11, and it is easy to insert the adhesive margin 15 into the inside of the first side wall 11 as it is. Further, since the margin portion 15 extends from the vicinity of the end portion of the top plate 14, when the margin portion 15 is inserted inside the first side wall 11, the edge of the margin portion 15 is It is easy to come into contact with the inner side of the inner flap 40 and the closed state of the top plate 14 is easily maintained.

  Further, a pair of second break guide wires 3 are provided on one upper outer flap 20, and a pair of third break guide wires 4 are respectively provided on a pair of inner flaps 40 extending from the first side wall 11 and the second side wall 13. Therefore, when the top plate 14 is partially closed, the closed state of the top plate 14 can be more reliably maintained by the engagement of the two pairs of the engaging portions 21 and the engaged portions 41. Moreover, since the protrusion 43 of the protruding piece as the engaged portion 41 is formed in a shape whose width becomes narrower in the protruding direction, the protrusion 41 is formed when the engaging portion 21 and the engaged portion 41 are engaged. It is easy to penetrate the perforation 21 which is the engaging portion 21. Further, since the protrusion 41 has a step formed between the protrusion 43 and the shaft portion 42, the step of the protrusion 41 is easily caught on the peripheral edge of the perforation 21 in the engaged state. The engagement of the joint portion 41 is difficult to be released due to carelessness.

[Other Embodiments]
The above embodiment has the above-mentioned advantages from the above configuration, but the present invention is not limited to the configuration of the above embodiment, and the design can be appropriately changed within the intended scope of the present invention.

  That is, in the said embodiment, although what provided a pair of engaging part 21 and a pair of to-be-engaged part 41 was demonstrated, this invention is not limited to this, At least 1 engaging part And if it has a to-be-engaged part, it is in the range which this invention intends. Moreover, in the said embodiment, although the piercing | piercing 21 was formed as the engaging part 21, and the protrusion 41 was formed as the to-be-engaged part 41, this invention is not limited to this, For example, an engaging part 21 may be a protrusion and the engaged portion 41 may be perforated.

  Further, in the above embodiment, the projection 41 is inserted into the perforation 21 from the outside. However, for example, the projection 41 can be inserted into the perforation 21 from the inside. It is also possible to close the top plate 14 so that the glue margin 15 is positioned outside the first side wall 11.

  Moreover, in the said embodiment, although the end point of the 1st fracture | rupture induction | guidance | derivation line 2 demonstrated what was a connection part with the 2nd side wall 13 of the top | upper surface board 14, this invention is not limited to this, For example, it is possible to provide the first break guide line 2 halfway through the top plate, that is, the end point of the first break guide line 2 may be a midway part of the top plate. In this case, by breaking along the first break guide line to the middle part of the top plate, the confidential paper is put into the open part by opening the top plate to the middle part. However, in this case, the open portion is smaller than the above embodiment, making it relatively difficult to insert, and in order to easily open and close part of the top plate, a separate crease is formed on the top plate, At this time, since it is necessary to cut the upper outer flap so that the upper outer flap connected to the top plate does not get in the way, the end point of the first breaking guide line 2 is the second of the top plate 14 as in the above embodiment. It is preferable to use a continuous portion with the side wall 13.

  Furthermore, in the above-described embodiment, the corrugated cardboard box for confidential waste paper (and the sheet for corrugated cardboard box for confidential waste paper) has been described. For example, it is possible to change the design as appropriate for use to store other inputs.

  The corrugated cardboard box for confidential used paper according to the present invention is suitably used, for example, as a packaging box for packing copy paper, and is suitably used as a box for sealing confidential used paper by reusing the packaging box.

DESCRIPTION OF SYMBOLS 1 Corrugated cardboard box 2 First break guide line 3 Second break guide line 4 Third break guide line 10 Square cylindrical part 11 First side wall 12 Bottom plate 13 Second side wall 14 Top plate 15 Glue margin 15a Tip edge 15b Continuous position 15c continuous position 20 upper outer flap 21 engaging part (perforation)
30 Lower outer flap 40 Inner flap 41 Engaged part (protrusion)
42 Shaft part 42a Ruled line 43 Projection

Claims (7)

A square tubular portion in which the first side wall, the bottom plate, the second side wall, the top plate and the glue margin portion are arranged in this order;
A pair of upper outer flaps extending from each edge of the top plate;
A pair of lower outer flaps extending from each edge of the bottom plate;
A sheet for a cardboard box comprising a single sheet comprising two pairs of inner flaps extending from each edge of each side wall,
A first break guide line provided along the circumferential direction of the rectangular tubular portion from the leading edge of the glue margin to the second side wall on the glue margin and the top surface,
A second breakage guide line provided on one of the upper outer flaps to form an engagement portion by being broken;
A corrugated cardboard box sheet comprising: a third break guide wire provided on one of the inner flaps to form an engaged portion that can be engaged with and disengaged from the engaging portion by being broken. The sheet for cardboard boxes according to claim 1, wherein the first break guide wire is provided near the other edge.   The distance from the other edge of the first break guide line is not less than 0.15 times and not more than 0.4 times the distance from the one edge to the other edge of the top plate. The sheet | seat for cardboard boxes of description. The leading edge of the glue margin is a substantially straight line that is substantially parallel to the continuous portion with the top surface part,
A pair of side edges of the margin part are provided so as to extend from the end portion of the continuous portion with the top plate toward the leading edge and to be continuous with the leading edge,
The continuous position of the side edge on the one side with the tip edge is located closer to the center side of the tip edge than the continuous position of the side edge on the other side with the tip edge. 3. A sheet for a cardboard box according to 3. A pair of the second break guide wires are provided on one upper outer flap,
The cardboard box sheet according to any one of claims 1 to 4, wherein the third break guide line is provided on each of a pair of inner flaps extending from the first side wall and the second side wall.   A cardboard box formed by assembling the sheet for a cardboard box according to any one of claims 1 to 5. Opening a part of the top surface portion of the cardboard box according to claim 6 in which the product is packaged by breaking the adhesive margin portion and the top surface plate along the first break guide line;
A step of taking out the product from the cardboard box in which a part of the top surface is opened,
Storing confidential waste paper in the cardboard box from which the product has been removed;
A process for sealing the above-mentioned corrugated cardboard box after containing the used paper
In the process of storing the above confidential waste paper,
The procedure for putting confidential waste paper into the cardboard box,
Closing the top plate after the procedure of putting the confidential waste paper, and engaging the engaging portion and the non-engaging portion formed by breaking along the second break guide line and the third break guide line;
A method for sealing confidential used paper, wherein the engaging portion and the non-engaging portion engaged are released and the top plate is opened.

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