JP7056470B2 - Packaging box and its box blanks and sleeves - Google Patents

Description

The present invention relates to a packaging box and its box blanks and sleeves, and more particularly to a packaging box which is securely sealed and easy to seal and its box blanks and sleeves.

Conventionally, when vegetables, fruits, etc. are packed in a box and shipped, a large number of them are shipped at one time, so that JIS-Z1507 0201 type (formerly A-1 type) cardboard boxes, which are easy to assemble, are often used.

In this box, rectangular four-side plates are connected in one direction, and the bottom and top surfaces of the box are closed above and below the four-side plates to form a box having a substantially rectangular parallelepiped shape. After storing the stored items in this box, when closing the top surface of the box, the outer flaps are butt-mounted on the inner flap, the entire top surface is closed, and the staples are mainly used so that the outer flap butt parts are straddled on both sides. The metal fittings called were driven in with a staple driving machine (called a boxer) and sealed.

However, the work of driving staples with a heavy boxer was a heavy labor, and the metal staples hindered the disposal of used boxes.

Therefore, a method for sealing a cardboard box without using staples has been proposed (see Patent Documents 1 to 3).

Patent Document 1 discloses that a packaging box is sealed by inserting an insertion piece formed in an outer flap into an engaging hole formed in an inner flap on the top surface of the box. However, if the insert is inserted toward the inside of the box, it may damage the surface of soft contents such as vegetables and fruits.

Therefore, Patent Documents 2 and 3 propose to seal the cardboard box by pulling up a part of the flap from the inside of the box.

In Patent Document 2, a pair of notch grooves are provided on the left and right sides of the tip of the inner flap on the top surface, the notch groove engages with the closing portion side edge of the outer flap, and both the inner and outer flaps are on the top surface of the packaging box. Disclose that it will be sealed. However, in Patent Document 2, since the left and right corners of the tip of the outer flap are cut out in an L shape, there is no overlap with the inner flap at the portion corresponding to the corner of the outer flap abutted on the top surface of the packaging box. , The sealing power is weakened.

Further, in Patent Document 3, a rectangular opening for pulling up the inner flap is required in the central portion of the top surface. Such an opening is not preferable from the viewpoint of foreign matter contamination and content protection.

JP-A-2002-193240 Japanese Unexamined Patent Publication No. 2004-59045 Patent No. 3951120

Therefore, an object of the present invention is to solve the above-mentioned problems, and to perform easy and reliable sealing without damaging the contents of the box without using sealing auxiliary materials such as metal staples. Is to provide.

The first aspect of the present invention is a pair of length planes facing each other, a pair of width planes facing each other across the pair of length planes, and the pair of lengths via a first ruled line. A packaging box including a pair of outer flaps connected to the upside surface and a pair of inner flaps connected to the pair of width surfaces via a second ruled line. It has a tip edge on the opposite side of the second ruled line, and a pair of side edge edges connected to the tip edge and the second ruled line, respectively, and at least one of the pair of in-top flaps. The in-plane flaps are each formed from the tip edge along the tip edge toward the second ruled line side, and a pair of first grooves defining a pull-up portion are further formed between them. The outer top flap has a tip edge on the opposite side of the first ruled line, and a pair of side edge edges connected to the tip edge and the first ruled line, respectively, and the pair of heavens. The out-of-plane flap further has a second groove formed from the tip edge toward the first ruled line side on the side edge side overlapping the in-top flap on which the first groove is formed. The distance between the side edge of the outer flap and the second groove corresponds to the distance between the second ruled line and the bottom of the first groove, and the first of the outer flaps. The distance from the ruled line to the bottom of the second groove corresponds to the distance from the first groove to the side edge of the in-top flap closer to the first groove, and the in-top flap. The pull-up portion defined between the pair of first grooves of the above is characterized by passing through the second groove of the pair of outer flaps and overlapping on the pair of outer flaps. Is to be.

In the packaging box of the first aspect of the present invention, the tip edge of the outer flap is the second side opposite to the side edge side overlapping the inner flap with respect to the second groove. Each further has a third groove connected to the side wall of the groove, the third groove is shallower than the second groove, and the in-top flap is between the pair of first grooves. A recess can be provided at the tip edge of the imaged pull-up portion. In the present invention, when the user pulls up the pull-up portion of the flap inside the top surface when the box is sealed, the user puts his finger on the recess formed at the tip edge of the pull-up portion and from the third groove formed in the flap outside the top surface. The inner flap can be pulled out.

Further, in the packaging box of the first aspect of the present invention, the distance from the bottom of the first groove to the second ruled line is from the bottom of the first groove to the tip edge of the flap in the top surface. May be greater than the distance of.

Further, in the packaging box of the first aspect of the present invention, from the bottom of the first groove to the second ruled line, in a direction away from the side edge of the flap in the top surface closer to the first groove. It is preferable that a pair of lines are extended toward each other to make it easier to bend when the seal is sealed.

A second embodiment of the present invention comprises a pair of length planes facing each other, a pair of width planes facing each other across the pair of length planes, and the pair of lengths via a first ruled line. A pair of outer flaps connected to the upsides, a pair of in-top flaps connected to the pair of width planes via a second ruled line, and a pair of length planes connected to the first ruled line, respectively. A box blank including a pair of outer bottom flaps connected to each other and a pair of inner bottom flaps connected to the pair of width surfaces via a second ruled line, wherein the top inner flap is of the second ruled line. The tip edge on the opposite side and a pair of side edge edges connected to the tip edge and the second ruled line, respectively, and at least one of the pair of top surface flaps has the above-mentioned top surface flap. The top surface is further provided with a pair of first grooves that are formed from the tip edge along the tip edge toward the second ruled line side and that define a pull-up portion between them. The outer flap has a tip edge on the opposite side of the first ruled line, and a pair of side edge edges connected to the tip edge and the first ruled line, respectively, and the pair of top outer flaps have the above-mentioned. A second groove formed from the tip edge toward the first ruled line side is further provided on the side edge side overlapping with the flap in the top surface on which the first groove is formed, and the outside of the top surface. The distance between the side edge of the flap and the second groove corresponds to the distance between the second ruled line and the bottom of the first groove, and is from the first ruled line of the outer flap to the second ruled line. The distance to the bottom of the groove corresponds to the distance from the first groove to the side edge of the flap in the top surface closer to the first groove.

In the box blank of the second aspect of the present invention, the tip edge of the outer flap is the second side opposite to the side edge side overlapping the inner flap with respect to the second groove. Each further has a third groove connected to the side wall of the groove, the third groove is shallower than the second groove, and the in-top flap is between the pair of first grooves. A recess can be provided at the tip edge of the imaged pull-up portion.

Further, in the box blank of the second aspect of the present invention, the distance from the bottom of the first groove to the second ruled line is from the bottom of the first groove to the tip edge of the flap in the top surface. May be greater than the distance of.

Further, in the box blank of the second aspect of the present invention, from the bottom of the first groove to the second ruled line, in a direction away from the side edge of the flap in the top surface closer to the first groove. It is preferable that a pair of lines are extended toward each other to make it easier to bend when the seal is sealed.

The third aspect of the present invention is a sleeve formed by stretching the box blank of the second aspect of the present invention. By making the box blank into a sleeve shape, the user can easily assemble and maintain a shape that is easier to distribute.

According to the present invention, the pull-up portion defined between the pair of first grooves of the inner flaps passes through the second groove of the pair of outer flaps and the pair of top surfaces. Since it overlaps the outer flap, the movement of the top surface inner flap after pulling up is suppressed, and the top surface outer flap overlaps the part between the raised portion of the top surface inner flap and the second ruled line from above. Therefore, it can be sealed more reliably.

By providing a recess on the tip edge of the pull-up portion of the top surface inner flap and a third groove on the top surface outer flap, the top surface inner flap can be easily pulled up.

It is a front view of the packaging box which shows one Embodiment of this invention. It is a back view of the packaging box which shows one Example of this invention. It is a left side view of the packaging box which shows one Example of this invention. It is a right side view of the packaging box which shows one Example of this invention. It is a top view of the packaging box which shows one Example of this invention. It is a bottom view of the packaging box which shows one Example of this invention. It is a top view of the box blank which shows one Example of this invention. It is a perspective view of the box in the state where the box blank of the embodiment of FIG. 7 is assembled and the top surface is open. It is a perspective view of the box which assembled the box blank of FIG. 7, and bent the flap outside the top surface and the flap inside the top surface by the first ruled line and the second ruled line, respectively. It is a top view of the packaging box of this invention obtained by sealing the box of FIG. (A) is an enlarged view of the overlapped portion between the raised portion of the flap inside the top surface and the flap outside the top surface of FIG. 10 as viewed from the first width surface 112 side. (B) is an enlarged view of the overlapped portion between the raised portion of the flap inside the top surface and the flap outside the top surface of FIG. 10 as viewed from the second width surface 114 side. FIG. 3 is a plan view of a box blank showing another embodiment of the present invention. It is a perspective view of the box in the state where the box blank of the embodiment of FIG. 12 is assembled and the top surface is open. It is a perspective view of the box which assembled the box blank of FIG. 12, and bent the flap outside the top surface and the flap inside the top surface by the first ruled line and the second ruled line, respectively. It is a top view of the packaging box of this invention obtained by sealing the box of FIG.

An embodiment in which the box 10 according to the present invention is applied to a 0201 type corrugated cardboard box defined by JIS-Z1507 will be described in detail with reference to FIGS. 1 to 11. The present invention is not limited to such an embodiment, and any structure other than the 0201 type can be used as long as at least one of the top surface and the bottom surface is a box composed of a pair of inner flaps and outer flaps. It can be applied to the box.

The appearance of the box 10 according to one embodiment of the present invention is shown in FIGS. 1 to 6, and the appearance of the box blank 30 is shown in FIG. That is, the box 10 according to the present embodiment for accommodating the contents (not shown) has a rectangular bottom surface 118 and a top surface 119, first and second length surfaces 111 and 113, and first and second width surfaces. It has a rectangular parallelepiped shape with 112 and 114.

The first length surface 111 is connected to the first top surface outer flap 121 and the first bottom surface outer flap 125 via the first ruled lines 131 and 135, respectively. The first width surface 112 is connected to the first length surface 111 via a third ruled line 141 orthogonal to the first ruled lines 131 and 135.

The first width surface 112 is connected to the first in-top flap 122 and the first in-bottom flap 126 via the second ruled lines 132 and 136, respectively. The second length surface 113 is connected to the second length surface 113 via a fourth ruled line 142 orthogonal to the second ruled lines 132 and 136.

The second length surface 113 is connected to the second outer surface flap 123 and the second outer bottom flap 127 via the first ruled lines 133 and 137, respectively. The second width surface 114 is connected to the second length surface 113 via a fifth ruled line 143 orthogonal to the first ruled lines 133 and 137.

The second width surface 114 is connected to the first in-top flap 122 and the second in-bottom flap 128 via the second ruled lines 134 and 138, respectively.

The first length surface 111 of the present invention is connected to the margin 115 via a sixth ruled line 144. Then, the margin 115 and the second width surface 114 are joined in a superposed state, that is, the body is attached, so that the first length surface 111 and the second width surface 114 are connected to each other via the sixth ruled line 144. It will be connected.

The box 10 of this embodiment can be obtained from a single flute double-sided corrugated board. Preferably, the first and second ruled lines (131 to 138) are scores and the third to sixth ruled lines (141 to 144) are creases. As a result, the compressive strength of the packaging box 10, that is, the stacking strength can be increased.

The first in-top flap 122 in this embodiment has a tip edge 161 on the opposite side of the second ruled line 132 and a pair of side edge edges 162 connected to the tip edge 161 and the second ruled line 132, respectively. The first in-top flap 122 further comprises a pair of first grooves 151 formed from the tip edge 161 along the tip edge 161 towards the second ruled line 132. The pair of first grooves 151 and the tip edge 161 define a pull-up portion 170 of the flap 122 in the top surface. Preferably, the pulling portion 170 is formed with a recess 154 in which a finger can be hooked on the central portion of the tip edge 161. The recess 154 may be formed by cutting out paper from the tip edge 161 or by making cuts on both sides of the recess and bending the paper between the cuts.

The bottom 155 of the first groove 151 is preferably separated from the side edge 162 closer to the first groove 151 by approximately 1/4 of the length of the second ruled line 132. The width of the first groove 151 preferably increases from the bottom 155 of the first groove 151 toward the tip edge 161 toward the side edge 162 side closer to the first groove 151. This facilitates the pulling up of the pulling-up portion 170 of the flap 122 in the top surface in the sealing step described later.

Further, the flap 122 in the top surface in the present embodiment is provided from the bottom 155 of the first groove 151 to the second ruled line 132 in the direction toward the center of the second ruled line, that is, the one closer to the first groove 151. A pair of wires 157 may be provided in a direction away from the side edge 162 to facilitate bending when the box of the present invention is sealed. The wire 157 may have a thickness reduced by pressing in advance, or may have a notched wire such as a perforation. Since the flap 122 in the top surface is bent by the line 157 at the time of sealing, the flap 122 in the top surface can be easily pulled up and sealed easily.

The outer flaps 121 and 123 in the present embodiment have a tip edge 163 on the opposite side of the first ruled lines 131 and 133, and a pair of side edge edges 164 connected to the tip edge 163 and the first ruled lines 131 and 133, respectively. , 165, respectively. The outer top flaps 121 and 123 have a second groove 152 formed from the tip edge 163 toward the first ruled lines 131 and 133 on the side edge 164 side overlapping the first inner flap 122. , Each have more. The distance between the side edge 164 and the bottom 156 of the second groove 152 corresponds to the distance from the bottom 155 of the first groove 151 to the second ruled line 132, and the distance from the first ruled line 131 to the second ruled line 152. The distance to the bottom 156 corresponds to the distance from the bottom 155 of the first groove 151 to the side edge 162 closer to the first groove 151. The second groove 152 is inclined toward the side edge 164 that overlaps with the first in-top flap 122, preferably from the bottom 156 toward the tip edge 163.

Further, in an embodiment of the present invention, preferably, the outer surface flaps 121 and 123 of the present invention are on the tip edge 163 opposite to the side edge 164 overlapping the first inner surface flap 122 (side end). The edge 165 side) has a third groove 153 connected to the side wall of the second groove 152, respectively. The third groove 153 is shallower than the second groove 152. The third groove 153 forms an opening 300 that allows the pulling portion 170 of the in-top flap 122 to be pulled up when the outer top flaps 121 and 123 are bent along the first ruled lines 131 and 133. be able to. Preferably, the width of the third groove 153 corresponds to the distance from the tip edge 161 to the bottom 155 of the second groove 152. The width of the third groove 153 is preferably smaller than the distance from the bottom 155 of the first groove 151 to the second ruled line 132. As a result, the area where the outer flaps 121 and 123 overlap on the inner flap 122 is larger than the area where the pulling portion 170 of the inner flap 122 overlaps the outer flaps 121 and 123. Therefore, the sealing power will be further improved.

Next, the sealing process of the packaging box of the present invention will be described with reference to FIGS. 8 to 11. FIG. 8 shows that the box blank of the present invention described in FIG. 7 is joined to the first length surface 111 at a ruled line 115, and then the bottom inner flaps 126, 128 and the bottom outer flaps 125, 127 are second, respectively. The ruled lines 136, 138, and the first ruled lines 135, 137 are bent inward and abutted against each other, and sealed to form the bottom surface 118. The bottom surface 118 can be sealed by a method well known in the art such as tape and adhesive.

FIG. 9 shows the open top surface of the box shown in FIG. 8 with a first in-top flap 122, a first out-of-top flap 121, a second in-top flap 124, and a second heaven. FIG. 3 is a perspective view of a box in which the top surface is closed by bending inward along the first or second ruled lines 131 to 134 in the order of the out-of-plane flap 123. In this embodiment, the first outer flap 121 and the second outer flap 123 are butted against each other, and the third groove 153 facing each other forms the opening 300. A pull-up portion 170 of the flap 122 in the top surface is located below the opening portion 300, and a recess 154 of the pull-up portion 170 is preferably located.

In FIGS. 10 and 11, the pull-up portion 170 of the closed box as shown in FIG. 9 is overlapped on the outer flaps 121 and 123 through the second groove 152 of the outer flaps 121 and 123. In addition, it is a figure which pulled up from an opening 300 and sealed the packaging box 10. In this embodiment, the user can put a finger on the recess 154 formed in the pull-up portion 170 of the flap 122 in the top surface, pull up the pull-up portion 170 from the opening 300, and easily seal the recess. On the other hand, when the user bends the outer flaps 121 and 123 and the inner flaps 122 and 124 as shown in FIG. By passing through the second groove 152, the seal may be sealed while forming the top surface.

In the packaging box 10 of the present invention, the pulling portion 170 of the top surface inner flap 122 is sandwiched between the second grooves 152 of the top surface outer flaps 121 and 123, the movement of the top surface inner flap 122 is suppressed, and the top surface outer surface flap 122 is suppressed. By overlapping the flaps 121 and 123, the sealing force can be improved.

The box 20 according to the second embodiment of the present invention applied to the 0201 type corrugated cardboard box defined by JIS-Z1507 will be described in detail with reference to FIGS. 12 to 15.

FIG. 12 shows the appearance of the box blank 40 of the box 20 according to the second embodiment of the present invention. That is, the box 20 according to this embodiment for accommodating contents (not shown) has a rectangular bottom surface 218 and a top surface 219, first and second length surfaces 211 and 213, and first and second width surfaces. It has a rectangular parallelepiped shape having 212 and 214 and having a sealing mechanism described in the first embodiment of the present invention at two locations on the top surface 219.

The first and second length surfaces 211 and 213, the first and second width surfaces 212 and 214, and the bottom surface 219 in the second embodiment of the present invention are formed in the same manner as in the first embodiment. be able to.

The first and second in-plane flaps 222 and 224 in the second embodiment of the present invention have the same shape as the first in-plane flap 122 in the first embodiment. Further, the first and second outer surface flaps 221 and 223 in the second embodiment of the present invention have the tip edge 163 and the first ruled line in the outer surface flaps 121 and 123 in the first embodiment. It has a shape in which the second groove 152 is formed line-symmetrically with the axis connecting the centers of 131 and 133 as the axis of symmetry. That is, the first and second outer flaps 221 and 223 have second grooves 252 at both ends of the tip edge 263, preferably a third groove 253, as in the first embodiment. Have.

In FIG. 13, the box blank of the present invention described in FIG. 12 is joined to the first length surface 211 at a ruled line 215, and then the bottom inner flaps 226, 228 and the bottom outer flaps 225, 227 are second, respectively. The ruled lines 236, 238, and the first ruled lines 235 and 237 are bent inward and abutted against each other, and sealed to form the bottom surface 218.

FIG. 14 shows the first open top surface of the box shown in FIG. 13 after bending the first and second in-top flaps 222 and 224 inward along the second ruled lines 232 and 234. It is a perspective view of a box in which the second outer flaps 221 and 223 are bent inward along the first ruled lines 231 and 233 and the top surface is closed. In this embodiment, the first outer flap 221 and the second outer flap 223 are butted against each other, and the third groove 253 facing each other forms the opening 600. Below the opening 600 are the pull-up portions 270 of the first and second in-top flaps 222 and 224, preferably the recesses 254 of the pull-up portion 270, respectively.

FIG. 15 opens the box pull-up portion 270 closed as shown in FIG. 14 so as to pass through the second groove 252 of the outer flaps 221 and 223 and overlap the outer flaps 221 and 223. It is a figure which pulled up from a part 600 and sealed the packaging box 20. In this embodiment, the user easily puts a finger on the recess 254 formed in the pull-up portion 270 of the first and second in-top flaps 222 and 224, and pulls up the pull-up portion 270 from the opening 600. Can be sealed.

In the packaging box 20 of the second embodiment of the present invention, the pull-up portions 270 of the flaps 222 and 224 inside the top surface are formed in the second grooves 252 of the flaps 221 and 223 outside the top surface at two locations on the top surface 219. By being sandwiched between them, the movement of the flaps 222 and 224 inside the top surface is suppressed, and the flaps 221 and 223 outside the top surface are overlapped with each other, the sealing force can be improved.

As described above, the present invention should be construed only from the matters described in the claims, and other than the matters described in all the changes and modifications included in the concept of the present invention in the above-described embodiment. Is possible. That is, all the matters in the above-described embodiment are not intended to limit the present invention, and may be arbitrarily changed according to the use and purpose thereof, including any configuration not directly related to the present invention. It is a thing.

10, 20 Packaging boxes 111, 211 First length surface 112, 212 First width surface 113, 213 Second length surface 114, 214 Second width surface 121, 221 First outer flap 122, 222 First in-top flap 123, 223 Second out-of-top flap 124, 224 Second in-top flap 125, 225 First out-of-bottom flap 126, 226 First in-bottom flap 127, 227 Second Outer bottom flap 128, 228 Second bottom inner flap 131, 133, 231, 233 First ruled line 132, 134, 232, 234 Second ruled line 141, 241 Third ruled line 142, 242 Fourth ruled line 143 , 243 5th ruled line 144, 244 6th ruled line 151, 251 1st groove 152, 252 2nd groove 153, 253 3rd groove 154, 254 recess 155, 255 bottom of 1st groove 156, 256 Bottom of second groove 157, 257 Lines 161, 261 Tip edges 162, 262 Side edge edges 163, 263 Tip edges 164, 264 Side edge edges 165, 265 Side edge edges 170, 270 Pull-ups 300, 600 Openings

Claims (7)

A pair of length planes facing each other, a pair of width planes facing each other across the pair of length planes, and a pair of top planes connected to the pair of length planes via a first ruled line. A packaging box including an outer flap and a pair of top inner flaps connected to the pair of width planes via a second ruled line.
The in-top flap has a tip edge on the opposite side of the second ruled line, and a pair of side edge edges connected to the tip edge and the second ruled line, respectively, and the pair of in-top flaps. At least one of the flaps in the top surface is formed from the tip edge along the tip edge toward the second ruled line side, and a pair forming a pull-up portion between them. It also has a first groove of
The outer top flap has a tip edge on the opposite side of the first ruled line, and a pair of side edge edges connected to the tip edge and the first ruled line, respectively, and the pair of outer top flaps. Further has a second groove formed from the tip edge toward the first ruled line side on the side edge side overlapping with the flap in the top surface on which the first groove is formed.
The distance between the side edge of the outer flap and the second groove corresponds to the distance between the second ruled line and the bottom of the first groove.
The distance from the first ruled line of the outer flap to the bottom of the second groove is the distance from the first groove to the side edge of the inner flap closer to the first groove. Correspondingly,
A pull-up portion defined between the pair of first grooves of the in-top flap overlaps the pair of out-of-top flaps through the second groove of the pair of out-of-top flaps. And
The tip edge of the outer flap is a third groove connected to the side wall of the second groove opposite to the side edge side overlapping the inner flap with respect to the second groove. The third groove is shallower than the second groove, and the in-top flap is recessed in the tip edge of the pull-up portion defined between the pair of first grooves. A packaging box characterized by having . The first aspect of the present invention is characterized in that the distance from the bottom of the first groove to the second ruled line is larger than the distance from the bottom of the first groove to the tip edge of the flap in the top surface. The listed packaging box. A pair for facilitating bending when sealing from the bottom of the first groove to the second ruled line in a direction away from the side edge of the flap in the top surface closer to the first groove. The packaging box according to claim 1 or 2 , wherein each of the lines is extended. A pair of length planes facing each other, a pair of width planes facing each other across the pair of length planes, and a pair of top planes connected to the pair of length planes via a first ruled line. An outer flap, a pair of top inner flaps connected to the pair of width planes via a second ruled line, a pair of bottom outer flaps connected to the pair of length planes via a first ruled line, and a second. It is a box blank provided with a pair of flaps in the bottom surface which are connected to the pair of width planes via the ruled line of 2.
The in-top flap has a tip edge on the opposite side of the second ruled line, and a pair of side edge edges connected to the tip edge and the second ruled line, respectively, and the pair of in-top flaps. At least one of the flaps in the top surface is formed from the tip edge along the tip edge toward the second ruled line side, and a pair forming a pull-up portion between them. It also has a first groove of
The outer top flap has a tip edge on the opposite side of the first ruled line, and a pair of side edge edges connected to the tip edge and the first ruled line, respectively, and the pair of outer top flaps. Further has a second groove formed from the tip edge toward the first ruled line side on the side edge side overlapping with the flap in the top surface on which the first groove is formed.
The distance between the side edge of the outer flap and the second groove corresponds to the distance between the second ruled line and the bottom of the first groove.
The distance from the first ruled line of the outer flap to the bottom of the second groove is the distance from the first groove to the side edge of the inner flap closer to the first groove. Correspondingly , the tip edge of the outer flap is connected to the side wall of the second groove opposite to the side edge side overlapping the inner flap with respect to the second groove. Each of the three grooves is further provided, the third groove is shallower than the second groove, and the in-top flap is the tip of the pull-up portion defined between the pair of first grooves. A box blank characterized by having a recess on the edge . 4. The fourth aspect of the present invention is characterized in that the distance from the bottom of the first groove to the second ruled line is larger than the distance from the bottom of the first groove to the tip edge of the flap in the top surface. The described box blank. A pair for facilitating bending when sealing from the bottom of the first groove to the second ruled line in a direction away from the side edge of the flap in the top surface closer to the first groove. The box blank according to claim 4 or 5 , wherein the lines of the above are extended respectively. A sleeve formed by stretching the box blank according to any one of claims 4 to 6 .

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