JP6129604B2 - Cardboard box sheet and cardboard box - Google Patents

Description

  The present invention relates to a corrugated cardboard box that is recycled to discard, for example, confidential waste paper, and a corrugated cardboard sheet for assembling the corrugated cardboard box.

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

  As a cardboard box for discarding such confidential materials, a packaging box that has already been used is generally reused, such as a cardboard box containing copy paper. When the cardboard box is reused, if the confidential data in the cardboard box is less than a predetermined amount, the confidential data may be additionally input to the cardboard box thereafter. In such a case, it is assumed that confidential material is additionally input, and the cardboard box may be stored in a state of being closed by a part of the cardboard box such as a flap without being sealed.

  However, if the flap is only closed, the flap may be inadvertently opened. In that case, confidential materials in the cardboard box may be scattered by the wind or the like.

JP 2010-84262 A

  The present invention has been made in view of such inconveniences, and an object of the present invention is to provide a cardboard box sheet and a cardboard box that can store confidential materials and the like easily and reliably until they are sealed. To do.

The invention made to solve the above problems is
A cardboard box sheet formed to assemble a box by assembling;
A first break guide wire configured to be capable of opening and closing at least a part of one side wall of the box in a door shape;
A second break guide wire configured to form an engaging tongue protruding from any side wall of the box;
A third break guide wire that forms a slit that can be engaged with the engaging tongue piece on any side wall of the box;
The engaging tongue piece has a belt-like base portion and a protruding end of the base portion, and has a head that is wider and substantially semicircular than the base portion,
The cardboard box sheet is characterized in that the ratio of the protruding length of the head to the maximum width is 0.4 or more.

  The corrugated cardboard box in which the corrugated cardboard sheet is assembled can form an opening by breaking one side wall along the first break guide line. From this opening, the article can be taken out, and after taking out the article, confidential waste paper or the like can be put into the inside from the opening. After putting confidential waste paper into the inside, the opening is closed by one side wall, and the engaging tongue piece formed by cutting along the second break guide line is cut along the third break guide line By engaging with the slit formed in (1), it can be fixed in a state where the opening is closed by one side wall. Therefore, since the opening can be reliably closed, it is possible to accurately and easily prevent the opening from being inadvertently opened.

  Moreover, when the ratio of the protruding length of the head to the maximum width is 0.4 or more, the dimension in the protruding direction of the head is ensured to be a certain level or more. Therefore, it becomes possible to maintain the strength of the head appropriately, and even when the engagement tongue piece is repeatedly engaged and disengaged, damage to the head can be suppressed, and insertion of the head becomes difficult. Can be suppressed. As a result, even if the engagement tongue piece is repeatedly engaged and disengaged, the engagement tongue piece can be easily and appropriately inserted into the slit, and the engagement state can be appropriately maintained.

  Furthermore, when the engaging tongue piece is composed of a substantially semi-circular head and a band-shaped base, and such an engaging tongue piece is inserted into the slit, the head can be easily inserted into the slit. The insertion resistance with the inner surface can be reduced. Therefore, the operation | work which inserts a head into a slit can be performed smoothly. Further, since the head portion is wider than the base portion, the step portion between the head portion and the base portion makes it difficult for the head portion to come out of the slit when the head portion is inserted into the slit. Therefore, since the state in which the engaging tongue piece is engaged with the slit is appropriately maintained, the confidential waste paper can be reliably stored until the cardboard box is sealed.

  The head preferably has a pair of symmetrical protrusions on the left and right sides of the continuous end with the base. By providing the pair of protrusions in this manner, when the head is inserted into the slit, the pair of protrusions are caught around the slit. Therefore, in the cardboard box assembled with the sheet for the cardboard box, the engagement state of the engagement tongue piece with the slit can be appropriately maintained, and the confidential waste paper is securely stored until the cardboard box is sealed. be able to.

  The pair of projecting portions preferably have tapered surfaces that are formed on the projecting direction side and are reduced in width in the projecting direction. By providing a taper surface with a reduced width at the projecting portion, the taper surface contacts the edge of the slit when the head is inserted into the slit. At this time, since the taper surface is provided so as to be reduced in width, the taper surface can smoothly insert the head into the slit, and at the same time, the discomfort during insertion can be reduced.

  The protruding direction of the engaging tongue piece may be substantially perpendicular to the ridgeline direction of the center core. Since such an engaging tongue piece is easy to bend along the ridgeline direction, it is easy to adjust the position of the head with respect to the slit by bending the base, and the operation of inserting the head into the slit becomes easy. Further, in a state where the head is inserted into the slit, the base is bent along the ridgeline direction, so that the head acts on the periphery of the slit by the restoring force of the base and the head. As a result, the state in which the engaging tongue piece is engaged with the slit is properly maintained, so that the confidential waste paper can be securely stored until the cardboard box is sealed.

The cardboard box sheet is
A rectangular side surface portion, a bottom surface portion, a side surface portion, a top surface portion, and an adhesive margin portion, which are continuously provided so as to constitute a rectangular cylindrical body;
Two pairs of lateral flaps extending from both end edges of the two side surfaces;
A pair of lower flaps extending from both edges of the bottom portion;
A pair of upper flaps extending from both ends of the top surface portion and pasted to the pair of lower flaps,
The first break guide line is formed in the top surface part and the glue margin part substantially parallel to the edge,
The second break guide line is formed on at least one of the two pairs of lateral flaps;
The third break guide line is formed on one upper flap of the pair of upper flaps,
The at least one lateral flap is provided with a pair of pasting areas where the one upper flap is pasted,
The second break guide wire is formed between the pair of pasting regions.

  When the corrugated cardboard box in which the sheet for corrugated cardboard box is assembled is broken along the second breaking guide line to form an engaging tongue piece on the lateral flap, the through hole in which the engaging tongue piece is extracted from the lateral flap Is formed. Due to the presence of this through hole, the strength of the lateral flap is lowered, and there is a concern that the strength as a cardboard box is lowered. On the other hand, the said through-hole is located between a pair of sticking area | regions by providing a 2nd fracture | rupture guide wire between a pair of sticking area | regions. Here, when forming the cardboard box using the sheet for the cardboard box, an adhesive such as hot melt is applied to the pair of pasting regions. Therefore, the periphery of the through hole is reinforced by the adhesive applied to the pair of pasting regions. As a result, even if the engaging tongue piece is extracted and a through hole is formed in the lateral flap, the strength can be appropriately maintained by the adhesive.

Another invention made to solve the above problems is as follows:
It is a cardboard box formed by assembling the cardboard box sheet.

  Since the corrugated cardboard box is formed by assembling the corrugated cardboard sheet, the opening can be reliably closed by engaging the engaging tongue piece with the slit and fixing one side wall. It is possible to accurately and easily prevent the opening from being easily opened.

  In addition, since the engaging tongue piece is composed of a substantially semi-circular head and a belt-like base portion, the engagement tongue piece can be easily and appropriately inserted into the slit even when the engagement tongue piece is repeatedly engaged and disengaged. The engagement state can be appropriately maintained. Furthermore, since the head is semicircular, the operation of inserting the head into the slit can be performed smoothly, and the head is less likely to come out of the slit when the head is inserted into the slit. Therefore, since the state in which the engaging tongue piece is engaged with the slit is appropriately maintained, the confidential waste paper can be reliably stored until the cardboard box is sealed.

  As described above, according to the present invention, confidential used paper can be stored easily and reliably until the cardboard box is sealed.

It is a top view which shows the sheet | seat for cardboard boxes which concerns on one Embodiment of this invention. It is a perspective view which shows the cardboard box which assembled the sheet | seat for cardboard boxes of FIG. It is a perspective view which shows the state which opened the cardboard box of FIG. It is sectional drawing for demonstrating the cross-sectional state of the sheet | seat for cardboard boxes of FIG. It is a top view for demonstrating an engagement tongue piece and a slit. It is the top view which expanded and showed the part enclosed with the dashed-two dotted line of FIG. It is principal part sectional drawing for demonstrating the operation | work which engages an engagement tongue piece with a slit. It is principal part sectional drawing which shows the state which engaged the engagement tongue piece with the slit. It is a principal part top view which shows the positional relationship of the adhesion part provided in the inner flap, and the 2nd fracture | rupture guide line. It is a perspective view which shows the state which made the engagement tongue piece engage with the slit and closed the opening from the opened state of FIG. It is a perspective view which shows the unsealed state of the cardboard box which concerns on other embodiment of this invention. It is a perspective view which shows the state which engaged the engagement tongue piece with the slit and closed the opening from the open state 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]
A cardboard box sheet 1 shown in FIG. 1 is for assembling the cardboard box 2 shown in FIGS. 2 and 3. That is, FIG. 1 corresponds to a development view of the cardboard box 2 shown in FIGS.

  The corrugated cardboard box 2 shown in FIGS. 2 and 3 is recycled for discarding confidential waste paper. The cardboard box 2 wraps commodities such as copy paper, and can be used to store confidential used paper after the product is taken out and discard the confidential used paper. The cardboard box 2 is formed in a rectangular parallelepiped shape corresponding to the size of the confidential waste paper because many of the confidential waste paper is rectangular. The size of the cardboard box 2 is not particularly limited, and is set as appropriate in consideration of the size of the product as will be described later.

  Such a corrugated cardboard box 2 has a rectangular cylindrical body 20 including a side surface portion 21, a bottom surface portion 22, a side surface portion 23, and a top surface portion 24. The cardboard box 2 further has a glue margin 25 and a pair of side surfaces 26 and 27.

  The margin part 25 is fixed to the side part 21 at the time of packaging of the product, and seals the product accommodated in the cardboard box 2.

  The side surface portion 26 extends from the upper outer flap 31 that extends from the edge of the top surface portion 24, the lower outer flap 32 that extends from the edge of the bottom surface portion 22, the edge portions of the side surface portion 21 and the side surface portion 23. The inner flaps 33 and 34 are formed. The side surface portion 27 extends from the upper outer flap 35 extending from the edge of the top surface portion 24, the lower outer flap 36 extending from the edge of the bottom surface portion 22, and the edges of the side surface portion 21 and the side surface portion 23. The inner flaps 37 and 38 are formed.

  The top surface portion 24 and the glue margin portion 25 have a first break guide wire 41. The first break guide line 41 is located at a position closer to the upper end edge of the side surface portion 27 than the upper end edge of the side surface portion 26 so as to cross the top surface portion 24 from the end edge 25A of the adhesive margin 25. Are provided along the circumferential direction. Therefore, the edge 25A of the margin portion 25 is set as the starting point, the margin portion 25 and the top surface portion 24 are cut along the first break guide line 41, and a portion 24A of the top surface portion 24 is rotated to thereby rotate the ceiling. The square opening 29 can be formed while maintaining continuity between the part 24B of the surface part 24 and the side part 27. By forming such an opening 29, a product such as a copy sheet can be taken out from the inside of the cardboard box 2 through the opening 29. On the other hand, after taking out the product from the opening 29, the cardboard box 2 stores the confidential waste paper inside by opening the confidential waste paper through the opening 29 and closing the opening 29 by a part 24A of the top surface portion 24. be able to. A part 24A of the top surface portion 24 is fixed to the inner flaps 33 and 34 and the side surface portion 21 in a state where the opening 29 is closed by inserting an engaging tongue piece 50 described later into the slit 51 (see FIG. 10).

  Here, the first break guide line 41 has a distance from the upper end edge of the side surface portion 27 within a range of 0.15 to 0.4 times the distance between the upper end edge of the side surface portion 27 and the upper end edge of the side surface portion 26. It is preferable that it is 0.2 times or more and 0.3 times or less. If the distance exceeds the upper limit, the opening 29 formed by breaking the top surface portion 24 along the first break guide line 41 may not be sufficiently widened. On the other hand, when the distance is less than the lower limit, there is a possibility that the bonding strength of the adhesive margin portion 25 where the bonding state with the side surface portion 21 is maintained when the opening 29 is formed may be lacking.

  The inner flaps 33 and 34 have a second break guide wire 42. The second break guide wire 42 forms the engaging tongue piece 50. That is, by cutting along the second break guide line 42, the engaging tongue piece 50 protruding from the inner flaps 33, 34 or from the boundary between the flaps 33, 34 and the side surface portion 21 can be formed. it can. The engaging tongue piece 50 is engaged with a slit 51 which will be described later when the cardboard box 2 is recycled, so that the top surface portion 24 is fixed to the inner flaps 33 and 34 together with the upper outer flap 31, and the cardboard box 2 is fixed. Used for sealing (see FIGS. 8 and 10).

  The upper outer flap 31 has a third break guide line 43. The third break guide wire 43 is for forming a slit 51 for engaging the engaging tongue piece 50. That is, the slit 51 penetrating the upper outer flap 31 can be formed by cutting along the third break guide line 43.

  The first break guide line 41, the second break guide line 42, and the third break guide line 43 are subjected to perforation processing or half cut processing when the corrugated cardboard box sheet 1 (see FIG. 1) is formed. Can be provided. A specific method for processing the first to third break guide wires 41 to 43 will be described later.

  The cardboard box 2 has a size corresponding to the copy paper size when the product is a copy paper. As the size of the cardboard box 2, for example, the width (inner dimension in the D5 direction) is 29 cm or more and 31 cm or less, and the depth (inner dimension in the D6 direction) is 41 cm or more and 43 cm or less. The cardboard box 2 having such a size appropriately accommodates a plurality of A4-size or A3-size copy paper packages (packaging a predetermined number of copy papers such as 500 sheets) or a predetermined number of confidential used paper. can do. The size of the cardboard box 2 may be a width (inner dimension in the D5 direction) of 25 cm or more and 27 cm or less and a depth (inner dimension in the D6 direction) of 35 cm or more and 37 cm or less. The corrugated cardboard box 2 having such a size can appropriately accommodate B5 size or B4 size copy paper packaging and confidential waste paper. In any of the illustrated cases, the height (inner dimensions) of the cardboard box 2 can be set as appropriate, and can be set to, for example, 22 cm or more and 24 cm or less. In addition, an internal dimension means the magnitude | size of an internal storage space, ie, the distance between the inner surfaces of each wall, in the state (box state) formed in the rectangular parallelepiped shape.

  In order to form such a cardboard box 2, the cardboard box sheet 1 shown in FIG. 1 is formed by processing a cardboard sheet. As this corrugated cardboard sheet, from the viewpoint of high strength and ease of processing and forming, a core 70 formed in a corrugated shape as shown in FIG. 4 and liners 71 and 72 laminated on both surfaces of the core 70 are provided. The double-sided cardboard provided is used. In the cardboard box sheet 1, the ridgeline of the center core 70 extends in the directions of arrows D1 and D2 in FIG. 1 (direction perpendicular to the paper surface of FIG. 4). The thickness T of the cardboard box sheet 1 is, for example, 1 mm or more and 5 mm or less, preferably 1.5 mm or more and 3.5 mm or less.

  1 has a plurality of panels 11 to 15, 16A to 19A, and 16B to 19B. The folds 81-84, 85A-88A, 85B-88B are formed in the connection part of each panel 11-15, 16A-19A, 16B-19B. By forming these folds 81-84, 85A-88A, 85B-88B, the cardboard box 2 can be easily assembled. For example, ruled line processing can be employed for forming the folds 81 to 84, 85A to 88A, and 85B to 88B.

  The panels 11 to 14 constitute the rectangular cylindrical body 10 (see FIG. 2) in the cardboard box 2, and become the side surface portion 21, the bottom surface portion 22, the side surface portion 23, and the top surface portion 24 (see FIG. 2), respectively. Is. The panel 11, the panel 12, the panel 13, and the panel 14 are connected in this order. The panel 11 and the panel 13 have a rectangular shape of substantially the same shape and the same size, and the panel 12 and the panel 14 have a rectangular shape of substantially the same shape and the same size.

  The panel 15 constitutes the margin part 25 in the cardboard box 2. The panel 15 has a substantially rectangular shape. The corner of the end of the panel 15 is dropped. The corner portion 15A at the end portion on the D3 direction side has a larger angle than the corner portion 15B at the end portion on the D4 direction side, and the corner portion at the end portion on the D3 direction side is the corner of the end portion on the D4 direction side. The curvature is larger than the part.

  The panels 11 and 15 are formed with a first break guide wire 89A. The first break guide line 89A corresponds to the first break guide line 41 (see FIG. 2) of the cardboard box 2, and is formed at a position closer to the panel 19B than the panel 19A. Specifically, in the first break guide line 89A, the distance L1 from the crease 88B is not less than 0.15 times the distance L2 between the crease 88A and the crease 88B (the distance in the D3 and D4 directions of the panel 14) L2. It is preferably within 4 times, more preferably 0.2 times or more and 0.3 times or less.

  The panel 16A, the panel 17A, the panel 18A, and the panel 19A constitute the inner flap 34, the lower outer flap 32, the inner flap 33, and the upper outer flap 31 (see FIG. 2) in the cardboard box 2, respectively. These panels 16A-19A form the side part 26 (refer FIG. 2). The panels 17A and 19A have notches 17Aa and 19Aa. These notches 17Aa and 19Aa form the notches 26A in the side surface portion 26 when the cardboard box 2 is assembled by the cardboard box sheet 1. This notch 26A is used when the cardboard box 2 is opened (see FIG. 2).

  The panel 16B, the panel 17B, the panel 18B, and the panel 19B correspond to the inner flap 38, the lower outer flap 36, the inner flap 37, and the upper outer flap 35, respectively, in the cardboard box 2. These panels 16B to 19B form the side surface portion 27.

  A second break guide wire 89B is formed on the panels 16A and 18A. The second break guide line 89B corresponds to the second break guide line 42 (see FIG. 3) of the cardboard box 2 and is for forming the engaging tongue piece 50 (see FIG. 3). The engaging tongue piece 50 has inner flaps 33 and 34 (see FIG. 3) along the second breaking guide line 89B (reference numeral 42 in FIG. 3) when the cardboard box 2 opened as described above is recycled. It is formed by cutting a part of.

  A third break guide wire 89C is formed on the panel 19A. The third break guide line 89C corresponds to the third break guide line 43 (see FIG. 2) of the cardboard box 2 and is for forming the slit 51 (see FIG. 3). The slit 51 is formed by cutting out the upper outer flap 43 (see FIG. 2) along the third breaking guide line 89C (reference numeral 43 in FIG. 2) when the cardboard box 2 opened as described above is recycled. Is formed. As will be described later, when the confidential waste paper is stored in the cardboard box 2 after opening, the slit 51 is engaged with the engaging tongue piece 50 to close the opening 29 (see FIG. 10).

  The first break guide line 89A, the second break guide line 89B, and the third break guide line 89C can be provided by performing perforation processing or half cut processing. Specifically, for example, an easy break line subjected to both perforation processing and half cut processing, and a normal break line subjected to only perforation processing can be employed. The perforation is to continuously form cut portions penetrating from the front surface to the back surface of the cardboard box sheet 1 at a constant interval. On the other hand, half-cutting is to cut one of the liners constituting the corrugated cardboard box sheet 1. Therefore, the easy break line can be formed by forming a perforation by perforation and then cutting one of the liners 70 and 71 of the front and back surfaces along the perforation by half-cutting.

  As shown in FIG. 5, the engaging tongue piece 50 has a base portion 52 and a head portion 53. The base 52 is formed in a band shape. The base 52 is a portion that protrudes from the inner flaps 33, 34 or from the side portion 21 when a part of the inner flaps 33, 34 is cut along the second breaking guide line 42 (89 </ b> B in FIG. 1). is there. The head 53 is formed in a substantially semicircular shape that is continuous with the protruding end of the base 52 and has a maximum width W2 in the directions D1 and D2 larger than the width W1 of the base 52.

  By providing the engaging tongue piece 50 including the substantially semicircular head 53 and the belt-like base 52, the operation of inserting the head 53 into the slit 51 can be performed smoothly. Further, when the head 53 is inserted into the slit 51, the step 53 between the head 53 and the base 52 makes it difficult for the head 53 to come out of the slit 51. Therefore, the state in which the engaging tongue piece 50 is engaged with the slit 51 is appropriately maintained.

  The head portion 53 has a pair of projecting portions 54 and 55 that project in the D1 and D2 directions from the end portion of the base portion 52 on the D4 direction side. These protrusions 54 and 55 have a substantially trapezoidal shape and are formed symmetrically in the D1 and D2 directions. The protrusions 54 and 55 are formed on the D3 direction side and have tapered surfaces 56 and 57 that are reduced in width in the D3 direction. By providing tapered surfaces 56 and 57 which are reduced in width in the projecting portions 54 and 55, the tapered surfaces 56 and 57 come into contact with the edge of the slit 51 when the head 53 is inserted into the slit 51. At this time, since the taper surfaces 56 and 57 are provided so as to be reduced in width, the taper surfaces 56 and 57 can smoothly insert the head 53 into the slit 51, and at the same time, there is a feeling of strangeness at the time of insertion. Can be reduced. After the head 53 is inserted into the slit 51, the pair of protrusions 54 and 55 are caught around the slit 51, so that the head 53 is difficult to come out of the slit 51.

  What is necessary is just to determine the dimension of each part in the engagement tongue piece 50 and the slit 51 according to the size of the cardboard box 2 formed with the sheet | seat 1 for cardboard boxes (refer FIG. 1). Further, the width W1 of the base 52 is such that when the second break guide wire 42 is provided between a pair of adhesive portions 61, 62 used for assembling the cardboard box 2 as described later, the pair of adhesive portions 61, It can also be determined according to the distance L8 between 62 (see FIG. 9).

When the cardboard box 2 accommodates 2,500 B4-size copy sheets, the dimensions of each part are set as follows.
The width dimension W1 of the base 52 is, for example, 20 mm to 55 mm, preferably 30 mm to 45 mm.
The maximum width W2 of the head 53 is, for example, not less than 35 mm and not more than 65 mm, preferably not less than 40 mm and not more than 50 mm.
The maximum width dimension (distance between arc ends) W3 of the head 53 other than the protrusions 54 and 55 is, for example, 30 mm to 60 mm, preferably 35 mm to 45 mm.
The dimension (projection length) L3 of the head 53 in the D3 direction is, for example, 15 mm or more and 55 mm or less, preferably 35 mm or more and 45 mm or less.

  The ratio (L3 / W2) of the protrusion length L3 to the maximum width W2 is 0.4 or more, preferably 0.5 or more. The upper limit of L3 / W2 is, for example, 0.8 or less, preferably 0.7 or less. When L3 / W2 is 0.4 or more, the dimension of the head 53 in the D3 direction is secured to a certain level or more. As a result, the strength of the head 53 can be appropriately maintained, so that damage to the head 53 can be suppressed even when the engagement tongue piece 50 is repeatedly engaged and disengaged, and the head with respect to the slit 51 can be suppressed. It can suppress that insertion of 53 becomes difficult. As a result, even when the engagement tongue piece 50 is repeatedly engaged and disengaged, the engagement tongue piece 50 can be easily and appropriately inserted into the slit 51, and the engagement state can be appropriately maintained.

  The projecting dimensions of the projecting parts 54 and 55 in the D1 and D2 directions are such that the dimension L4 from the base part 52 is, for example, 2 mm or more and 7 mm or less, preferably 2.5 mm or more and 5 mm or less, as shown in FIG. The dimension L5 from the arc end 53A is, for example, not less than 1 mm and not more than 6 mm, preferably not less than 1,5 mm and not more than 4 mm. By setting the projecting dimensions L4 and L5 of the projecting portions 54 and 55 within the above range, the head 53 can be smoothly inserted into the slit 51, and after the head 53 is inserted into the slit 51, the engagement with the slit 51 is achieved. The engaged state of the tongue piece 50 can be maintained appropriately.

  Further, the inclination angle θ of the tapered surface 56 (57) is, for example, 30 ° to 80 °, preferably 45 ° to 70 °.

On the other hand, the width dimension W4 of the slit 51 is not less than 1 and not more than 3 times, preferably not less than 1.25 times and not more than 2.5 times the thickness T1 (see FIG. 4) of the sheet 1 for cardboard boxes. Specifically, the width dimension W4 is, for example, not less than 1 mm and not more than 10 mm, preferably not less than 2 mm and not more than 5 mm.
The length L6 of the slit 51 is smaller than the maximum width W2 of the head 53 and larger than the width of the head 53 (distance between the arc ends 53A) W3. Specifically, the length dimension L6 is, for example, 32.5 mm or more and 62.5 mm or less, preferably 37.5 mm or more and 47.5 mm or less.

  Moreover, the minimum width L7 between the edge of the slit 51 and the edge of the protrusions 54 and 55 is, for example, 0.5 mm or more and 5 mm or less, preferably 1 mm or more and 3 mm or less.

  Here, since the ridgeline of the center core 70 extends in the directions of arrows D1 and D2 in the drawing, the protruding direction D3 of the engaging tongue piece 50 is substantially perpendicular to the ridgeline directions D1 and D2 of the center core 70. That is, in the engaging tongue piece 50, the ridgeline of the core 70 extends in the directions D1 and D2. Here, the cardboard sheet has a property of being easily bent along the ridgeline direction of the core 70. Therefore, as shown in FIG. 7, the engagement tongue piece 50 is appropriately bent at the boundary between the base portion 52 and the head portion 53, so that the head portion with respect to the slit 51 is inserted when the head portion 53 is inserted into the slit 51. Adjustment of the position of 53 becomes easy. As a result, the operation of inserting the head 53 into the slit 51 is facilitated. On the other hand, as shown in FIG. 8, when the head 53 is inserted into the slit 51, if the base 52 is bent along the ridgeline direction, the restoring force of the base 52 or the head 53 causes the head The portion 53 applies a pressing force around the slit 51. As a result, since the state in which the engaging tongue piece 50 is engaged with the slit 51 is appropriately maintained, the opening 29 is prevented from being inadvertently opened, and until the cardboard box 2 is sealed, Confidential waste paper can be securely stored.

[Assembly of cardboard boxes]
The corrugated cardboard box 2 shown in FIG. 2 is assembled by forming the side surface portions 26 and 27 after forming the rectangular cylindrical body 20 using the cardboard box sheet 1 shown in FIG.

  The rectangular cylindrical body 20 is formed by bending the panels 11 to 15 along the folds 81 to 84 and then joining the panel 15 serving as the adhesive margin portion 25 to the panel 11 serving as the side surface portion 21.

  The side surfaces 26 and 27 are directed toward the inside of the rectangular cylindrical body 20 along the folds 85A to 88A and 85B to 88B so that the panels 17A, 17B, 19A, and 19B overlap the panels 16A, 16B, 18A, and 18B. It is formed by bending at a substantially right angle and fixing. At this time, since the notches 17Aa and 19Aa are formed in the panels 17A and 19A, the side portions 26 are formed with the notches 26A (see FIG. 2).

  For example, an adhesive is used to fix the panels 17A, 17B, 19A, 19B (upper outer flaps 31, 35 and lower outer flaps 32, 36) to the panels 16A, 16B, 18A, 18B (inner flaps 33 to 36). Done. As the adhesive, for example, a hot melt adhesive is used. As the hot melt adhesive, one based on a thermoplastic resin is used. Thermoplastic resins include acrylic, methacrylic, polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, polyvinyl alcohol, polyacetal, polyvinyl butyral, polyacrylonitrile, polyphenylene oxide, polysulfone, ethylene-vinyl acetate, Examples include polyamide, polyester, polyolefin, styrene-elastomer, thermoplastic rubber, butyl rubber, polyurethane, epoxy, polycarbonate, polyvinyl ether, polybutadiene, and cellulose.

  The adhesive is applied to the panels 16A, 16B, 18A, 18B (inner flaps 33 to 36). Various known methods can be employed for applying the adhesive. For example, application by a dispenser, screen printing, or the like can be applied. On the panels 16A, 16B, 18A, and 18B (inner flaps 33 to 36), for example, four adhesive portions 61 to 64 are formed as shown in FIGS. Among these adhesion parts 61-64, the 2nd fracture | rupture induction | guidance | derivation line 42 (engagement tongue piece 50) is formed between a pair of adhesion parts 61 and 62. As shown in FIG. At least the head 53 of the engaging tongue piece 50 is located between the pair of adhesive portions 61 and 62.

[Removal of product]
As shown in FIGS. 2 and 3, the product packed in the cardboard box 2 can be taken out from the opening 29 by forming an opening 29 in the top surface portion 24. An opening 29 can be formed in the cardboard box 2 as follows. First, the upper outer flap 31 is peeled off from the inner flaps 33 and 34 with the notch 26A as a starting point. Next, the margin part 25 is peeled off from the side part 21 with the corner 15A of the margin part 25 as a starting point. Next, along the first break guide line 41, the glue margin 25 and the part 24A of the top surface part 24 are broken, and the part 24A of the top surface part 24 is rotated to form a square opening 29. . At this time, since the first break guide wire 41 is formed so as to divide the top surface portion 24, the continuity between the part 24B of the top surface portion 24 and the side surface portion 27 is maintained.

[Storage and sealing of confidential waste paper]
The cardboard box 2 stores confidential sealed paper inside or seals it by putting the confidential waste paper into the inside through the opening 29 and closing the opening 29 with a part 24A of the top surface portion 24 after taking out the goods from the opening 29. can do.

  Until a predetermined number of confidential used paper is stored inside the cardboard box 2 and the cardboard box 2 is sealed, the confidential used paper is stored in the cardboard box 2. In this case, until the predetermined number of confidential used paper is stored inside the cardboard box 2, the additional input of the confidential used paper may be repeatedly performed in the cardboard box 2. On the other hand, when the confidential waste paper is stored in the cardboard box 2, the opening 29 formed when the product is taken out is closed. Such closing of the opening 29 is performed by inserting the adhesive margin portion 25 into the inside of the side surface portion 21 and inserting the engaging tongue piece 50 into the slit 51.

  When first putting confidential paper into the cardboard box 2, the upper outer flap 31 and the inner flaps 33, 34 are broken along the second break guide line 42 and the third break guide line 43 to engage the engagement tongue. A piece 50 and a slit 51 are formed. Before and after the formation of the engaging tongue piece 50 and the slit 51, the confidential waste paper is stored in the cardboard box 2 by inserting the confidential waste paper from the opening 29 and then engaging the engaging tongue piece 50 with the slit 51.

  The engagement of the slit 51 with the engaging tongue piece 50 is performed by inserting the head 53 into the slit 51. Here, in the engaging tongue piece 50, the ridge line of the core 70 extends in the width direction (D1, D2 direction) of the head portion 53 and the base portion 52. Therefore, the position of the head 53 with respect to the slit 51 can be easily adjusted by bending the boundary 58 between the base 52 and the head 53 as shown in FIG. As a result, the operation of inserting the head 53 into the slit 51 is facilitated. In addition, since the head 53 is substantially semicircular, the contact resistance between the head 53 and the inner surface of the slit 51 can be reduced when the head 53 is inserted into the slit 51. In particular, the protrusions 54 and 55 having the tapered surfaces 56 and 57 are provided on the engaging tongue piece 50, so that when the head 53 is inserted into the slit 51, the protruding tapered surfaces 56 and 57 are formed on the edge of the slit 51. Because of the contact, the head 53 can be smoothly inserted into the slit 51, and at the same time, the uncomfortable feeling during insertion can be reduced.

  On the other hand, after inserting the head 53 into the slit 51, the maximum width W2 of the head 53 is larger than the width W1 of the base 52 (see FIG. 5). It becomes difficult to come out from the slit 51. In particular, when the head 53 has a pair of protrusions 54 and 55, the protrusions 54 and 55 can act as a stopper that interferes with the periphery of the slit 51. When the base 52 is bent along the ridgeline direction, the head 53 exerts a pressing force on the periphery of the slit by the restoring force of the base 52 and the head 53 as shown in FIG. . As a result, since the state in which the engaging tongue piece 50 is engaged with the slit 51 is appropriately maintained, the opening 29 is prevented from being inadvertently opened, and until the cardboard box 2 is sealed, Confidential waste paper can be securely stored.

  When additional confidential paper is put into the cardboard box 2, the opening 29 is opened by releasing the engagement state between the engaging tongue piece 50 and the slit 51, and the confidential waste paper is inserted through the opening 29 before being engaged. The tongue piece 50 is engaged with the slit 51. Thereby, in a state where the opening 29 is closed, a part 24 </ b> A of the top surface portion 24 is fixed to the inner flaps 33 and 34 via the upper outer flap 31. Therefore, the opening 29 can be reliably closed, and it is possible to accurately and easily prevent the opening 29 from being inadvertently opened.

  Thus, when confidential waste paper is sealed in the cardboard box 2 and discarded, the confidential waste paper may be stored in the cardboard box 2 and the confidential waste paper may be additionally charged. The engagement / disengagement of the tongue piece 50 may be repeatedly performed. Therefore, the engaging tongue piece 50 can be smoothly inserted into the slit 51 and the engaged state can be appropriately maintained, whereby the confidential used paper can be appropriately stored in the cardboard box 2.

  Here, when the engaging tongue piece 50 is formed by breaking a part of the inner flaps 33 and 34 along the second breaking guide line 42, the engaging tongue piece 50 is extracted from the inner flaps 33 and 34. A through hole 50A is formed (see FIG. 3). Due to the presence of the through-hole 50A, there is a concern that the strength of the inner flaps 33 and 34 is lowered before the confidential waste paper is sealed, and the strength as the cardboard box 2 is lowered. On the other hand, as shown in FIG. 9, the portion corresponding to the head 53 is positioned in the region between the pair of bonding portions 61 and 62, thereby forming the head 53 in the through hole 50 </ b> A. The region is located between the pair of adhesive portions 61 and 62. In other words, the pair of bonding portions 61 and 62 exist above and below the corresponding region of the head 53 in the through hole 50A. Since these adhesion parts 61 and 62 are formed, for example with a hot-melt-adhesive etc., the circumference | surroundings of 50 A of through-holes are reinforced with a pair of adhesion parts 61 and 62. FIG. Therefore, even if the engaging tongue piece 50 is extracted and the through holes 50A are formed in the inner flaps 33, 34, the strength can be appropriately maintained by the pair of adhesive portions 61, 62.

  The sealed used paper is sealed in the cardboard box 2 after the predetermined number of used used paper is stored in the cardboard box 2, the part 24 </ b> A of the top surface portion 24 is closed and the cardboard box 2 is sealed. Specifically, the cardboard box 2 is sealed by fixing the top surface portion 24 with an adhesive tape or the like so as not to open. At the time of sealing, the margin portion 25 may be positioned inside the side surface portion 21 as in the case of storing confidential waste paper, but may be positioned outside the side surface portion 21. Further, the engaging tongue piece 50 may be engaged with the slit 51 or may not be engaged.

[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.

  For example, as in the corrugated cardboard box 9 shown in FIGS. 11 and 12, an engagement tongue piece 91 may be provided on the upper wall 90 and a slit 93 may be provided on the front wall 92. In this case, the upper wall 90 can be fixed to the front wall 92 by engaging the engagement tongue piece 91 of the upper wall 90 with the slit 93 of the front wall 92. Such a corrugated cardboard box 9 can be formed by changing the positions at which the second break guide line 89B and the third break guide line 89C (see FIG. 1) are formed in the cardboard box sheet 1.

  On the contrary, the engaging tongue piece 91 may be provided on the front wall 92 and the slit 93 may be provided on the upper wall 90.

  The shape of the protrusion of the engaging tongue piece is not limited to the shape shown in FIG. 5 and the like, and the protrusion may be omitted.

  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 Cardboard box sheet | seat 2 Cardboard box 21,23,26,27 Side surface part 22 Bottom surface part 24 Top surface part 31,35 Upper outer flap 32,36 Lower outer flap 41,89A First break guide line 42,89B Second break Guide wire 43, 89C Third break guide wire 50 Engagement tongue 52 Base 53 Head 54, 55 Projection

Claims (6)

The top and
A pair of upper flaps extending from the top surface,
With other flaps to be attached to the upper flap
Comprising at least
A cardboard box sheet formed to form a closed box by assembling;
A first break guide wire configured to be capable of opening and closing at least a part of the top surface portion in a door shape;
A second break guide wire configured to form an engaging tongue protruding from any side wall of the box;
The engaging tongue piece to one of the side walls of the boxes and a third break induction lines constituting engageable slit,
The engaging tongue piece has a belt-like base portion and a protruding end of the base portion, and has a head that is wider and substantially semicircular than the base portion,
Ri der ratio 0.4 or more with respect to the maximum width of the projecting length of the head,
One of the upper flap, corrugated cardboard box sheet characterized that you have extending from the portion of the top surface section for opening and closing the door shape.   The cardboard box sheet according to claim 1, wherein the head has a pair of symmetrical protrusions on the left and right sides of the continuous end side with the base.   The cardboard box sheet according to claim 2, wherein the pair of projecting portions has a tapered surface that is formed on the projecting direction side and is reduced in width in the projecting direction.   The corrugated cardboard box sheet according to claim 1, wherein the protruding direction of the engaging tongue piece is substantially perpendicular to the ridge line direction of the core. Side portions of the square provided continuously so as to constitute a rectangular tubular body, a bottom portion, side portion, and the top face portion and the overlap portion,
Two pairs of lateral flaps extending from both end edges of the two side surfaces;
A pair of lower flaps extending from both edges of the bottom portion;
Extending from opposite edges of the top face portion, and a pair of the upper flap that is affixed to the lateral flaps,
The first break guide line is formed on the top surface portion and the glue margin portion substantially in parallel with the edge of the rectangular cylindrical body ,
The second break guide line is formed on at least one of the two pairs of lateral flaps;
The third break guide line is formed on one upper flap of the pair of upper flaps,
The at least one lateral flap is provided with a pair of pasting areas where the one upper flap is pasted,
The sheet for cardboard boxes according to any one of claims 1 to 4, wherein the second break guide wire is formed between the pair of pasting regions.   A cardboard box formed by assembling the sheet for a cardboard box according to any one of claims 1 to 5.

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