Packaging box and blank sheet thereof

Abstract

To provide a packaging box which is excellent in operability for opening and closing, and excellent in closeability and sealing property before and after opening, and a blank sheet for the packaging box.SOLUTION: A packaging box and a blank sheet thereof include: a front plate 2, a left plate 3, a right plate 4, and a rear plate 5 connected in a cylindrical shape; an upper lid plate 6 connected to an upper edge of the rear plate 5 and closing one opening; left and right support pieces 7 and 8 connected to upper edges of the left and right plates 3 and 4; a front support piece 9 connected to an upper edge of the front plate 2; and a bottom lid piece connected to a lower edge of any of the four side surfaces 2, 3, 4, and 5 and closing the other cylindrical opening, wherein the left and right support pieces 7 and 8 include left and right sealing adhesive pieces 10 and 11 which are connected to a tip edge via a breaking line α and are attached to a back surface of the upper lid plate 6, the upper lid plate 6 includes a front sealing adhesive piece 14 connected to a tip edge via breaking means A and attached to the front support piece 9 or the front plate 2, and locking means B for removably connecting the upper lid plate 6 and the front support piece 9 is provided.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention belongs to the technical field of packaging boxes, and relates to a packaging box suitable for storing medicines, food, etc., which is easy to open and whose opening can be repeatedly opened and closed, and a blank sheet thereof. [Background technology]

[0002] Conventionally, packaging boxes of the top-open type, seal-end type, etc. have been widely used for packaging individual products such as confectionery, food, medicine, cosmetics, etc. In the packaging boxes used for these purposes, the contents are rarely used up all at once, and the boxes are opened, the required number of items are taken out, and then resealed for storage many times. Therefore, such packaging boxes are required to be able to maintain sufficient closure before use, to have excellent operability such as being easy to open, and to have a structure that can maintain a stable closed state when resealing after opening.Furthermore, they are required not to require special equipment modifications during the box-making process.

[0003] Therefore, in the case of resealable packaging boxes, a carton having a zipper section at the opening part for easy opening is provided with an insert flap and a slit or hole (hereinafter referred to as a "slit, etc.") through which the insert flap can be inserted, so that the box can be resealed and the individually packaged products contained therein can be preserved (see, for example, Patent Document 1 below).

[0004] In particular, in packaging boxes that have a large opening for removing individually packaged products by opening them, there is a problem that the closure plate that opens and closes can warp or fold depending on the material, making it easier for the insertion flap to come out of the notches, etc., and reducing resealability. In particular, in storage boxes for medicines or cosmetics, relatively heavy bottles and other stored items are repeatedly inserted and removed, so the box itself or the opening and closing parts are often required to have shape retention and durability.

[0005] In addition, for the purposes of not only making it easier to reseal the carton but also of making the insertion flap less likely to come off and maintaining good resealability, Patent Document 2 discloses a packaging box that, for example, provides a concave-arc fold line on the insertion flap so that when the insertion flap is inserted into the slit after the zipper portion is broken and opened, the insertion flap can be folded along the concave-arc fold line, causing the insertion flap to change from flat to a slightly curved shape, providing rigidity during insertion and allowing it to recover from the folded state after resealing, thereby not only improving ease of resealing but also solving the problem of poor resealability due to folding habits (see, for example, Patent Document 2 below). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3150970 [Patent Document 2] JP 2003-112724 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, conventional packaging boxes have focused only on the form (shape and size) related to the insertion flap, and little attention has been paid to improving the closure of the packaging box with respect to the lid before opening, or maintaining the strength and form of the closure plate after opening to maintain the closure and sealing state. In particular, even when a packaging box containing individually packaged products, such as stick-shaped products, is carried after opening, it is necessary to give the lid and opening a rigidity (shape retention) that allows them to maintain a certain shape in order to prevent the alignment of the individually packaged products in the packaging box from being disturbed or to prevent them from being stacked in a disorderly manner due to shaking, and to reseal the box so that it can maintain a good appearance when reopened. In addition, conventional packaging boxes have a problem that the opening line (break line) is exposed even before opening and there is no element to protect it, so that the already fragile break line is easily broken and the contents are easily exposed by interference with other objects, weight, etc. After opening, the inside and outside of the packaging box may communicate through the gap at the break point, and the inside of the packaging box may be exposed through the gap between the flaps, so the product is not properly hidden and the sealing performance is poor.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a packaging box and a blank sheet for a packaging box that have a configuration that is excellent in operability when opening, resealing, and reopening, and that has excellent closing and sealing properties before and after opening. [Means for solving the problem]

[0009] The packaging box according to the present invention, which has been made to solve the above problems, is made of a blank sheet punched out as a continuous sheet, and comprises a front panel, a left panel, a right panel, and a rear panel which are connected together in a cylindrical shape when the blank sheets are assembled, a top cover plate which is connected to the upper edge of the rear panel and closes one open end of the cylindrical shape, left and right support pieces which are connected to the upper edges of the left and right side panels on either side of the rear panel, a front support piece which is connected to the upper edge of the front panel which faces the rear panel, and a front cover plate which is connected to the upper edge of the front panel which faces the rear panel. The container is characterized in that it has a lower cover piece connected to the lower edge of any of the front, left, right and rear side panels and closing the other cylindrical opening, the left and right support panels have left and right sealing adhesive pieces connected to their tip edges via break lines and attached to the back surface of the top cover plate, the top cover plate has a front sealing adhesive piece connected to its tip edge via a break means and attached to the front support piece or the front side panel, and is equipped with a locking means for removably connecting the top cover plate and the front support panel.

[0010] The breaking means breaks across the entire width between the top cover plate and the front glue piece, and can be configured to have a breaking band sandwiched between two parallel breaking lines along the edge of the top cover plate, and the locking means can be configured to have a movable part in the top cover plate which has a locking claw at its tip and can be tilted when pressure is applied, and a locking hole in the front support piece formed opposite the movable part, allowing the movable part to tilt, and having a locking edge with which the locking claw engages. In addition, the left and right support pieces can be set in a series of bands along the edges of the left and right side panels, and the left and right sealing adhesive strips can be set in a series of bands along the edges of the left and right support pieces, or the left and right covering adhesive strips can be connected to the tip edges of the left and right support pieces and attached to the back surface of the front support piece, and the left and right covering adhesive strips can be positioned in front of the left and right sealing adhesive strips.

[0011] The present invention provides a blank sheet for a packaging box, which has been made to solve the above problems, and is punched out as a continuous sheet, and comprises a front panel, a left panel, a right panel, and a rear panel which are connected together in an assembled state to form a cylinder, a top cover plate which is connected to the upper edge of the rear panel and closes one open end of the cylinder, left and right support pieces which are connected to the upper edges of the left and right side panels on either side of the rear panel, a front support piece which is connected to the upper edge of the front panel which faces the rear panel, and a front cover plate which is connected to the upper edge of the front panel which faces the rear panel. The container is characterized in that it has a lower cover piece connected to the lower edge of any of the front, left, right and rear side panels and closing the other cylindrical opening, the left and right support panels have left and right sealing adhesive pieces connected to their tip edges via break lines and attached to the back surface of the top cover plate, the top cover plate has a front sealing adhesive piece connected to its tip edge via a break means and attached to the front support piece or the front side panel, and is equipped with a locking means for removably connecting the top cover plate and the front support panel.

[0012] The breaking means breaks across the entire width between the top cover plate and the front glue piece, and can be configured to have a breaking band sandwiched between two parallel breaking lines along the edge of the top cover plate, and the locking means can be configured to have a movable part in the top cover plate which has a locking claw at its tip and can be tilted when pressure is applied, and a locking hole in the front support piece formed opposite the movable part, allowing the movable part to tilt, and having a locking edge with which the locking claw engages. In addition, the left and right support pieces can be set in a series of bands along the edge edges of the left and right side panels, and the left and right sealing adhesive strips can be set in a series of bands along the edge edges of the left and right support pieces, or the left and right covering adhesive strips can be connected to the tip edges of the left and right support pieces and attached to the back surface of the front support piece, and the left and right covering adhesive strips can be positioned in front of the left and right sealing adhesive strips. Effect of the Invention

[0013] According to the packaging box and packaging box blank sheet of the present invention, the left and right sealing adhesive pieces are attached front to back near the center of the left and right side edges of the top cover plate, thereby retaining and reinforcing the shape of the top cover plate, thereby improving the closure of the packaging box for the lid portion before opening and maintaining the strength and shape of the top cover plate after opening, thereby providing a highly practical effect in maintaining the closure and sealed state. In addition, by giving rigidity to the top cover plate, even when the packaging box containing the individually packaged products is carried, regardless of whether it is before or after opening, the alignment of the individually packaged products inside the packaging box is prevented from being disturbed or the products are prevented from being stacked in a disorderly manner due to shaking, thereby maintaining a good appearance when opened.

[0014] In addition, since the break line except for the starting point of the opening operation is covered by the top cover plate, the fragile break line can be protected even if it is interfered with by other objects or weight is applied, etc. Even after opening, the inside of the packaging box is not exposed through the gap at the break point, and even before opening, the inside of the packaging box is not exposed through the slits at the break line, so the product is securely hidden and sealing is ensured. Furthermore, the resealing operation can be completed by simple operations, for example, by applying pressure to the movable part of the top cover plate, which has improved shape retention, to point the locking claw toward the inside of the packaging box, inserting the tip of the locking claw into the locking hole, and releasing the pressure on the movable part while pressing the top cover plate against the opening, and the resealing operation also has high closing properties. In this way, the present invention contributes to the provision of a packaging box and a blank sheet for a packaging box that have a configuration that is excellent in operability when opening, resealing, and reopening, and that has excellent closing and sealing properties before and after opening. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing an example of a packaging box according to the present invention before it is opened. [Diagram 2] FIG. 2 is a perspective view showing an example of a packaging box according to the present invention when opened. [Diagram 3] FIG. 2 is a perspective view showing an example of a packaging box according to the present invention when resealed. [Figure 4] FIG. 1 is a perspective view showing an example of a packaging box according to the present invention before being filled with individual products. [Diagram 5] FIG. 2 is a perspective view showing an example of a packaging box according to the present invention after being filled with individual products. [Figure 6] FIG. 2 is a plan view showing an example of a blank sheet for a packaging box according to the present invention. [Figure 7] FIG. 2 is a plan view showing an example of a blank sheet for a packaging box according to the present invention. [Figure 8] FIG. 2 is a plan view showing an example of a blank sheet for a packaging box according to the present invention. [Figure 9] FIG. 2 is a plan view showing an example of a blank sheet for a packaging box according to the present invention. [Figure 10] FIG. 2 is a perspective view showing an example of a packaging box according to the present invention when opened. [Figure 11] FIG. 2 is a plan view showing an example of a blank sheet for a packaging box according to the present invention. [Figure 12] FIG. 2 is a plan view showing an example of a blank sheet for a packaging box according to the present invention. [Figure 13]FIG. 2 is a perspective view showing an example of a packaging box according to the present invention when opened. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a packaging box and a blank sheet therefor according to the present invention will be described in detail with reference to the drawings. The examples shown in Figures 1 to 5, 10 and 13 are formed from a blank sheet that is punched out as a single piece from a sheet of paper or the like. EXAMPLES

[0017] 6 and 7 are development views of the blank sheet as viewed from the front side. This blank sheet comprises a rectangular bottom plate (lower cover piece) 1, rectangular front plate 2, left plate 3, right plate 4 and rear plate 5 each connected to the four sides of the bottom plate 1, a rectangular top cover plate 6 connected to the upper edge of the rear plate 5 and closing one opening end of the cylindrical shape formed by the four side plates 2, 3, 4, 5, rectangular left and right support pieces 7, 8 connected to the upper edges of the left and right side plates 3, 4 on either side of the rear plate 5, a rectangular front support piece 9 connected to the upper edge of the front plate 2 opposite the rear plate 5, rectangular left and right sealing adhesive pieces 10, 11 connected to the tip edges of the left and right support pieces 7, 8 via a break line α and attached to the back surface of the top cover plate 6, and rectangular shape-retaining adhesive pieces 12, 13 connected to the left and right side edges of the front and rear side plates 2, 5 and attached to the back surfaces of the side ends of the left and right side plates 3, 4.

[0018] The four side plates 2, 3, 4, and 5 are set so that the lengths in the height direction when joined together during assembly are equal, and the lengths in the width direction of the opposing side plates are equal. The top cover plate 6 has a shape substantially the same as that of the bottom plate 1 . The left and right sealing adhesive pieces 10, 11 are connected in a continuous band shape of uniform width over the areas excluding the front and rear ends of the left and right support pieces 7, 8. The front support piece 9 is set to a width shorter than the front end area of ​​the left and right support pieces 7, 8 where the left and right sealing glue strips 10, 11 are not connected so as to not overlap with the left and right sealing glue strips 10, 11 (see Figure 2).

[0019] The shapes of the front support piece 9, the left and right support pieces 7, 8, the left and right sealing adhesive pieces 10, 11, and the shape-retaining adhesive pieces 12, 13 can be appropriately selected according to the shape of the individually packaged product (not shown) to be contained in the packaging box, the shape of the attachment destination, etc. Also, the bottom plate 1 can be configured with a plurality of sealing plates or support pieces appropriately extended on the edges of the four side plates 2, 3, 4, 5 as long as it can seal the opening, but in light of the fact that gaps occurring due to a configuration with a plurality of sealing plates or support pieces can cause problems such as tampering and the intrusion of foreign matter into the inner space, it is preferable to seal the opening with a series of bottom plates.

[0020] The top cover plate 6 is provided at its leading edge with a front sealing adhesive strip 14 connected via a breaking means A and affixed to the front side plate 2. Furthermore, the upper cover plate 6 can also be configured to have a front sealing adhesive piece 14 at its leading edge which is connected via a breaking means A and attached to the front edge portion (closer to the front side plate 2) of the front support piece 9. The breaking means A breaks across the entire width between the top cover plate 6 and the front sealing glue strip 14, and provides a breaking zone 15 between the top cover plate 6 and the front sealing glue strip 14, sandwiched between two parallel breaking lines β, β along the edge of the top cover plate 6.

[0021] The top cover plate 6 has a semicircular cut γ at the center of its tip, which forms a movable part 16 having a locking claw 16a at its tip and capable of tilting when pressure is applied. On the other hand, the front support piece 9 has a locking hole 17 drilled in a position opposite the movable part 16 when assembled into a packaging box, which allows the movable part 16 to tilt and has a locking edge 17a with which the locking claw 16a engages. In this example, the locking claw 16a of the movable part 16, the locking hole 17 and the locking edge 17a form a locking means B for fixing the top cover plate 6 to the front support piece 9 during resealing, thereby maintaining the opening of the packaging box sealed with the top cover plate 6. Incidentally, a plurality of the locking means B may be provided, and a configuration including the locking means B for fixing the top cover plate 6 to the left and right support pieces 7, 8 may be adopted. The breaking band 15 may be provided either at a position facing the front side plate 2 or at a position facing the front support piece 9, but is positioned in an area where the engagement hole 17 will not be exposed when the breaking band 15 is detached.

[0022] Next, a method for assembling a packaging box using the above blank sheet will be described. First, the left and right shape-retaining adhesive pieces 12, 13 connected to the left and right side edges of the front panel 2 and the rear panel 5 are bent backward at 90 degrees relative to the front panel 2 and the rear panel 5, and the front panel 2 and the rear panel 5 are bent backward at 90 degrees relative to the bottom panel 1. Secondly, adhesive is applied to the surfaces of the left and right shape-retaining adhesive strips 12, 13, the left and right side panels 3, 4 are folded back at 90 degrees to the bottom panel 1, and their left and right ends are attached to the surfaces of the left and right shape-retaining adhesive strips 12, 13 (see Figure 4).

[0023] At this point, the filling operation of the individually packaged products is carried out. When the filling operation is completed, thirdly, the left and right support pieces 7, 8 connected to the edges of the left and right side panels 3, 4 are folded back at 90 degrees relative to the left and right side panels 3, 4 together with the left and right sealing glue pieces 10, 11 (see Figure 5), and the front support piece 9 connected to the edge of the front side panel 2 is folded back at 90 degrees relative to the front side panel 2. Through the above process, before the top cover plate 6 is closed, the individually packaged products placed in the inner space of the packaging box are restricted from moving sideways while pressure is applied from the front and back of each end, and a predetermined number of individually packaged products are neatly secured in the inner space with the minimum volume. This action and effect will be advantageous in shifting from the current situation where manual packaging was almost inevitable for thin packaging boxes to automatic packaging. Fourth, adhesive is applied to the left and right sealing strips 10, 11 and the front sealing strip 14, the top cover plate 6 is folded back 90 degrees relative to the rear plate 5, and its left and right side edges are attached to the surfaces of the left and right sealing strips 10, 11. Finally, the front sealing adhesive strip 14 is folded 90 degrees to the back side relative to the top cover plate 6 and attached to the surface of the front side plate 2, completing the assembly of the packaging box containing the individually packaged products (see FIG. 1).

[0024] In the packaging box constructed as described above, the various break lines α, β and locking holes 17 face and are covered by the top cover plate 6 and the front support piece 9, so that the individually packaged products contained therein are not exposed through the gaps between the break lines α, β and the locking holes 17, and the break lines α, β that determine the outer edge of the opening opening are also covered by the top cover plate 6 except for where the breaking means A is exposed for the convenience of the opening operation, thereby avoiding interference with other objects that may cause unintended opening. In addition, by attaching the left and right sealing adhesive margins 10, 11 toward the center of the top cover plate 6, the hollow portion of the packaging box is prevented from bulging out at the center, and the effect of applying relatively uniform pressure to the individually packaged products inside the packaging box from above and below can be maintained, thereby preventing the arrangement of the individually packaged products filled in an aligned state from becoming disarrayed.

[0025] The opening and resealing operations of the packaging box will be described below. The opening operation is completed by first peeling off the break band 15 connected to the leading edge of the top cover plate 6 and connecting the top cover plate 6 to the front sealing glue strip 14, separating the top cover plate 6 from the front sealing glue strip 14 attached to the front side plate 2, and then pulling up the leading edge of the top cover plate 6 to separate the left and right sealing glue strips 10, 11 and the left and right support strips 7, 8 attached to the top cover plate 6 at the break lines α, α. At this time, the top cover plate 6, the left and right support strips 7, 8, and the front support strip 9 connected to the four side plates 2, 3, 4, 5 that form the opening are inclined toward the inside of the opening, so that the individually packaged products contained therein are prevented from spilling out of the internal space.

[0026] The resealing operation involves applying pressure to the movable part 16 of the top cover plate 6 so that the locking claw 16a faces toward the inside of the packaging box, inserting the tip of the locking claw 16a into the locking hole 17, and releasing the pressure on the movable part 16 while pressing the top cover plate 6 against the front support piece 9 and the left and right support pieces 7, 8. By this operation, the restoring force of the top cover plate 6 and the movable part 16 causes the locking claws 16a to engage with the locking edges 17a, and the top cover plate 6 maintains the opening closed (see FIG. 3). At this time, the left and right sealing adhesive pieces 10, 11 remaining along the left and right side edges of the top cover plate 6 act as frameworks, preventing the top cover plate 6 from warping or bulging and supplementing the rigidity of the top cover plate 6, so that after opening, the individually packaged products in the packaging box can be appropriately pressurized and the alignment of the individually packaged products in the packaging box can be maintained. In addition, the packaging box is provided with a front support piece 9 and left and right support pieces 7, 8 around the periphery of the opening, which cover the gap between the opening and the periphery of the top cover plate 6, so that when resealed, most of the gap between the inside and outside of the packaging box can be sealed. EXAMPLES

[0027] This second embodiment is formed from a blank sheet that is punched out as a single piece from a sheet of paper or the like. 8 and 9 are development views of the blank sheet of the packing box according to Example 2, seen from the front side. The blank sheet of Example 2 has a configuration substantially similar to that of Example 1, and provides the same operational effects due to the similar configuration.

[0028] In this embodiment 2, the left and right sealing adhesive pieces 10, 11 extended from the tip edges of the left and right support pieces 7, 8 are connected in a band-like shape along the tip edges of the left and right support pieces 7, 8 to the rear parts of the tip edges of the left and right support pieces 7, 8 (see Figures 8 and 9). In this embodiment 2, in addition to the left and right sealing glue pieces 10, 11, the left and right covering glue pieces 18, 19 are connected in a band-like shape along the tip edges of the left and right support pieces 7, 8 in front of the left and right sealing glue pieces 10, 11. The left and right sealing adhesive pieces 10, 11 and the left and right covering adhesive pieces 18, 19 can be arranged separately in the front and rear, or connected so as to be separable in the front and rear. Here, the front part is a position where the back surface of the front support piece 9 can be supported during assembly, and the rear part is a position where the back surface of the top cover plate 6 can be supported during assembly.

[0029] The assembly method and the opening and resealing operations of the second embodiment are substantially the same as those of the first embodiment. In the process of sealing the packaging box assembled from the blank sheet, the left and right sealing adhesive strips 10, 11 are affixed to the back surface of the top cover plate 6 in the same manner as in Example 1, and maintain the shape of the packaging box in a sealed state. On the other hand, the left and right covering adhesive strips 18, 19, which differ in configuration from Example 1, are affixed to the back surface of the front support piece 9, and when the blank sheet is assembled into the packaging box as described above, after it is opened, they cover one end of the individually packaged product (the front of the packaging box) together with the left side plate 3, the right side plate 4 and the front support piece 9 (see FIG. 10).

[0030] The opening operation is substantially the same as that of Example 1. First, the rupture band 15 is torn off to separate the top cover plate 6 from the front sealing adhesive strip 14 attached to the front side plate 2, and then the leading edge portion of the top cover plate 6 is pulled up to separate the left and right sealing adhesive strips 10, 11 and the left and right support strips 7, 8 attached to the top cover plate 6 at the rupture lines α, α. At this time, the left and right support pieces 7, 8 and the front support piece 9 are integrated in a frame-like manner to cover the front panel 2 and the left and right side panels 3, 4 of the opening via the left and right covering adhesive pieces 18, 19. As a result, combined with the shape of the packaging box being reinforced, the posture of the packaging box is stable even when the packaging box is stood upright, and this has the effect of preventing the individually packaged products contained therein from spilling out of the internal hollow portion. In this example, the height of the four side panels 2, 3, 4, and 5 are set relatively high to improve the stability of the container, and the depth width of the front support piece 9 is also set relatively high to prevent the individually packaged products from falling off when the container is stood up (see Figures 8 to 10). EXAMPLES

[0031] Like the first and second embodiments, the third embodiment is also formed from a blank sheet that is punched out integrally from a sheet of paper or the like. 11 and 12 are development views of a blank sheet for a packing box according to Example 3, seen from the front side. The blank sheet of Example 3 has substantially the same configuration as the blank sheets of Examples 1 and 2, and provides the same operational effects due to the similar configuration. That is, in the third embodiment, the left and right support pieces 7, 8 and the front support piece 9 are integrated in a frame-like manner to cover the front panel 2 and the left and right side panels 3, 4 of the opening via the left and right covering adhesive pieces 18, 19. As a result, coupled with the shape of the packaging box being reinforced, the posture of the packaging box is stable even when the packaging box is stood upright, and the individually packaged products contained therein are prevented from spilling out of the hollow interior portion.

[0032] On the other hand, if the depth width of the left and right support pieces 7, 8 is made too large, the adhesion position of the left and right sealing adhesive pieces 10, 11 connected to the leading edge of the support pieces 7, 8 via the break line α will be too close to the center of the back surface of the top cover plate 6. As a result, the non-adhesive area between the left and right sealing adhesive pieces 10, 11 and the side edge of the top cover plate 6 will expand, and the side edge will easily separate from the surface of the left and right support pieces 7, 8, and the appearance before opening will look as if the package has already been opened. Furthermore, if the non-adhesive area on the side edge of the top cover plate 6 expands excessively, it may function as a pocket into which foreign matter may enter and become trapped, and any foreign matter that enters this pocket during the distribution process may then find its way directly into the consumer's residence.

[0033] In order to avoid such concerns, in Example 3, the left and right support pieces 7, 8 are set in a continuous band shape along the edge edges of the left and right side panels 3, 4, and are provided with left and right band-shaped covering adhesive pieces 18, 19 that are attached to the back surface of the front support piece 9 along their tip edges, and the left and right covering adhesive pieces 18, 19 are set in a band shape along the edge edges of the left and right support pieces 7, 8 in front of the left and right sealing adhesive pieces 10, 11.In particular, in Example 3, the connection portions between the left and right sealing adhesive pieces 10, 11 and the left and right support pieces 7, 8 at the left and right covering adhesive pieces 18, 19 are arranged to penetrate (bite into) the left and right support pieces 7, 8, and are connected breakably via a break line α (see Figures 11 to 13). In this example, the left and right sealing adhesive pieces 10, 11 and the left and right covering adhesive pieces 18, 19 are arranged so that they uniformly penetrate into approximately half of their respective depth widths, but the degree of penetration can be adjusted so that the attachment position with the top cover plate 6 is not excessively close to the center.In addition, it is also possible to adopt a configuration in which portions of the band-shaped left and right sealing adhesive pieces 10, 11 and the left and right covering adhesive pieces 18, 19 penetrate intermittently into the left and right support pieces 7, 8 at one or more points, and are connected in a breakable manner via a break line α (see Figure 9).

[0034] In addition, the outer edge of the front part of the band-shaped left and right sealing adhesive pieces 10, 11 is tapered in an arc shape so that the left and right sealing adhesive pieces 10, 11 can be easily detached from the left and right support pieces 7, 8 when opening the case. A curved outer edge is also used for the outer edge of the rear part, but the rear part is treated to provide a cutout that is inclined forward and outward (streamlining treatment) in order to reduce interference between the edges of the left and right support pieces 7, 8 from which the left and right sealing adhesive pieces 10, 11 have detached and products or hands when the rear part is provided as a stand case with improved uprightness (to eliminate sharp edges). The left and right sealing adhesive pieces 10, 11 and the left and right covering adhesive pieces 18, 19 can be made discontinuous, and a configuration can be adopted in which, after the left and right sealing adhesive pieces 10, 11 are detached, a protrusion is left between the detached areas of the left and right sealing adhesive pieces 10, 11 and the left and right covering adhesive pieces 18, 19 to prevent the individually packaged products contained therein from spilling out sideways from the inner hollow portion.

[0035] The packaging box and the blank sheet for the packaging box according to the present invention are not limited to the above embodiment, and the shape of the locking means B for locking the top cover plate 6 in the closed state can be changed as appropriate as long as it can be securely locked and easily released. The size and shape of the box body can also be changed as appropriate according to the contents. [Explanation of symbols]

[0036] A breaking means, B locking means, α break line, β parallel break line, γ notch, 1 Bottom plate, 2 Front plate, 3 Left side plate, 4 Right side plate, 5 Rear side plate, 6 Top cover plate, 7 left support piece, 8 right support piece, 9 front support piece, 10 Left sealing glue piece, 11 Right sealing glue piece, 12 shape-retaining glue piece, 13 shape-retaining glue piece, 14 Front sealing glue piece, 15 Fracture zone, 16 Movable part, 16a Locking claw, 17 locking hole, 17a locking edge, 18 Left covering glue piece, 19 Right covering glue piece,

Claims

1. It consists of blank sheets punched into a series of sheets, a front plate, a left plate, a right plate, and a rear plate which are connected in a cylindrical shape when the blank sheet is assembled; an upper cover plate connected to an upper end edge of the rear side plate and closing one open end of the cylindrical shape; Left and right support pieces connected to upper edges of the left and right side plates on both sides of the rear side plate; a front support piece connected to an upper end edge of a front plate facing the rear plate; a lower cover piece connected to a lower end edge of any one of the front plate, the left plate, the right plate, and the rear plate to close the other opening of the cylindrical shape; The left and right support pieces are provided with left and right sealing adhesive pieces connected to their leading edges via break lines and attached to the back surface of the top cover plate, The top cover plate is provided with a front sealing adhesive strip connected to its leading edge via a breaking means and attached to the front support piece or the front side plate, A packaging box comprising: a locking means for detachably connecting said top cover plate and said front support piece.

2. The left and right support pieces are set in a continuous strip shape along the edges of the left and right side plates, 2. The packaging box according to claim 1, wherein the left and right sealing adhesive strips are set in a continuous band shape along the end edges of the left and right support strips.

3. The left and right covering adhesive strips are connected to the tip edges of the left and right support pieces and are attached to the back surface of the front support piece, 3. The packaging box according to claim 1, wherein the left and right covering adhesive strips are disposed in front of the left and right sealing adhesive strips.

4. It is punched into a series of sheets, a front plate, a left plate, a right plate, and a rear plate which are connected in a cylindrical shape when the blank sheet is assembled; an upper cover plate connected to an upper end edge of the rear side plate and closing one open end of the cylindrical shape; Left and right support pieces connected to upper edges of the left and right side plates on both sides of the rear side plate; a front support piece connected to an upper end edge of a front plate facing the rear plate; a lower cover piece connected to a lower end edge of any one of the front plate, the left plate, the right plate, and the rear plate to close the other opening of the cylindrical shape; The left and right support pieces are provided with left and right sealing adhesive pieces connected to their leading edges via break lines and attached to the back surface of the top cover plate, The top cover plate is provided with a front sealing adhesive strip connected to its leading edge via a breaking means and attached to the front support piece or the front side plate, A packaging box blank sheet comprising: a locking means for detachably connecting said top cover plate and said front support piece.

5. The left and right support pieces are set in a continuous strip shape along the edges of the left and right side plates, 5. The blank sheet for packaging boxes according to claim 4, wherein the left and right sealing adhesive pieces are set in a continuous band shape along the end edges of the left and right support pieces.

6. The left and right covering adhesive strips are connected to the tip edges of the left and right support pieces and are attached to the back surface of the front support piece, 6. The blank sheet for packaging boxes according to claim 4, wherein the left and right covering adhesive strips are disposed in front of the left and right sealing adhesive strips.

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