Tubular packaging boxes

Abstract

To provide a cylindrical packaging box that can be packaged with simple work, and has a beautiful appearance in a packaged state.SOLUTION: A pair of side surfaces 14 and 16 are overlapped, and a pair of side edge parts are continuously formed into a cylindrical shape. The cylindrical lower end part of the pair of sides 14 and 16 is closed by a holed flap 38. The holed flap 38 has an opening 50 into which a stored article 64 is inserted. An inner diameter of the opening 50 is larger than an outer diameter of the stored article 64. A peripheral edge part 50b of the opening 50 is provided with a tongue piece 52 projecting toward the center of the opening 50. An insertion diameter of the opening narrowed by the tongue piece 52 is smaller than the outer diameter of the stored article 64. The peripheral edge part 50b of the opening 50 is provided with a notch line 54 that coincides with a base end part of the tongue piece 52, and is along a projecting direction of the tongue piece 52.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tubular packaging box having two sides between which contents are placed for sale or display. [Background technology]

[0002] Conventionally, there is a cylindrical packaging box having two side surfaces and a bottom surface, and the side surface is a cylinder having a convex lens-shaped cross section. In such cylindrical packaging boxes, there is an opening provided on the bottom surface, through which contents are inserted. For example, the packaging container of Patent Document 1 is composed of a front part and a back part, and the front part and the back part are connected to each other at both ends in the width direction, and one end edge of the front part and the back part is provided with a non-return part bent inward. The non-return part is provided with a V-shaped notch part so that it can be easily bent when inserting the contents. In this packaging container, when the contents are inserted into the opening between the front part and the back part, the non-return part is pushed toward the inner side of the front part and the back part, and the contents pass through without being obstructed. At this time, the non-return part is bent at the notch part, and after this, when the contents pass through, the non-return part is separated from the inner side of the front part and the back part, and the opening is blocked. As a result, the contents cannot be taken out after being inserted, and can be easily packaged.

[0003] The product storage container of Patent Document 2 is provided with a pair of plates for storing the contents and four support flaps formed at the ends of the plates. A lower opening into which the product is inserted is defined by being surrounded by the free edges of the four support flaps. When the product is inserted into the inner space from the lower opening of this product storage container, the lower opening widens and the product is stored in the inner space, the pair of plates abutting against the product stored in the inner space bulge in the front-rear direction due to the thickness of the product, the lower opening narrows while each support flap is inclined obliquely upward at a predetermined angle, and the free edges of each support flap abut against the bottom surface of the product. This makes it impossible to remove the product, and allows for easy packaging. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-121938 A [Patent Document 2] JP 2017-165458 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of Patent Document 1 of the above-mentioned background art, when inserting an item, a fold line coinciding with the cutout portion may be created on the non-return portion and the front portion connected to the non-return portion, and in the case of Patent Document 2, when inserting a product, a fold line coinciding with the space between the support flaps may be created on the plate connected to a pair of support flaps, which may result in an undesirable appearance.

[0006] SUMMARY OF THE PRESENT DISCLOSURE The present invention has been made in consideration of the problems in the background art described above, and has an object to provide a cylindrical packaging box which allows packaging with simple operations and has a beautiful appearance in the packaged state. [Means for solving the problem]

[0007] The present invention is a cylindrical packaging box having an inner space in which an object is placed, the inner space being formed by bending the pair of side surfaces away from each other, with a pair of side edges overlapping each other and continuing together. The cylindrical lower ends of the pair of side surfaces are closed by perforated flaps, and the perforated flaps are provided with an opening through which the object is inserted. The inner diameter of the opening is larger than the outer diameter of the object, and a tongue is provided at the periphery of the opening that protrudes toward the center of the opening, and the insertion diameter of the opening narrowed by the tongue is smaller than the outer diameter of the object. The periphery of the opening is provided with a cut line that coincides with or is close to the base end of the tongue and runs along the protruding direction of the tongue.

[0008] The cylindrical packaging box is composed of one box-body forming piece, and the box-body forming piece is provided such that the pair of side surfaces are separated by a fold line, One of the pair of side surfaces On the side edge of the side, On the other sideThe adhesive pieces to be glued are provided separated by fold lines. One of the pair of side surfaces The cylindrical packaging box has a locking flap at the end located at the lower side when the box is assembled and used. On the other hand, The perforated flap is provided at an end portion located at the lower side of the side of the perforated flap. The perforated flap has the opening, the tongue piece, and the cut line at its center. End of is provided with a flap gluing portion that is glued to the locking flap, and the end of the cylindrical lower part of the side surface is closed by gluing the flap gluing portion to the locking flap. A shallow recess is cut into the locking flap, and when the tubular packaging box is assembled and used, the peripheral edge of the opening of the perforated flap matches the recess of the locking flap, and the lower end of the contents is fitted into the peripheral edge and the recess. The locking flap and the perforated flap are provided with folding lines that are pressed by the side surfaces and folded when the pair of side surfaces are bent in directions away from each other. It is preferable that a plurality of the tongue pieces are provided and arranged symmetrically with respect to each other.

[0009] The cross-sectional shape of the container may be such that the outer diameter is long in one direction. is formed When the cutting line opens, the opening opens wide in a direction intersecting the cutting line to allow the contents to pass through, and after the contents have passed through, the cutting line closes.

[0010] before The adhesive piece may have a groove for holding the contents. One of the pair of sides It is advisable to provide a tear line on the side for easy opening. Effect of the Invention

[0011] The cylindrical packaging box of the present invention can be packaged by the simple task of inserting the contents from the opening at the bottom, and the appearance of the packaged product can be configured beautifully. The shape of the bottom allows it to stand upright on a shelf at a storefront, making it suitable for sales and display. Once the contents are placed in the box, they cannot be removed from the bottom, and if an attempt is made to forcibly remove the contents, the bottom will be damaged or wrinkled, which also serves to prevent tampering. Furthermore, no seal is required, making the packaging process simple. [Brief description of the drawings]

[0012] [Figure 1] 1A is a perspective view of the front side of a cylindrical packaging box according to a first embodiment of the present invention, and FIG. 1B is a perspective view of the back side. [Diagram 2] FIG. 2 is a development view of the cylindrical packaging box of this embodiment. [Diagram 3] FIG. 2 is a development view showing the assembled state of the cylindrical packaging box of this embodiment. [Figure 4] FIG. 2 is a bottom view of the cylindrical packaging box of this embodiment. [Diagram 5] 1A is a vertical cross-sectional view showing a state in which an item is to be put into the cylindrical packaging box of this embodiment, and FIG. 1B is a vertical cross-sectional view showing a state in which the item has been put into the box. [Figure 6] 1A is a perspective view of the front side of a cylindrical packaging box according to a second embodiment of the present invention, and FIG. [Figure 7] FIG. 2 is a development view of the cylindrical packaging box of this embodiment. [Figure 8] FIG. 2 is a bottom view of the cylindrical packaging box of this embodiment. [Figure 9] 1A is a vertical cross-sectional view showing a state in which an item is to be put into the cylindrical packaging box of this embodiment, and FIG. 1B is a vertical cross-sectional view showing a state in which the item has been put into the box. [Figure 10] FIG. 11 is a development view of a cylindrical packaging box according to a third embodiment of the present invention. [Figure 11] 13A is a perspective view of the front side of a cylindrical packaging box according to a fourth embodiment of the present invention, and FIG. [Figure 12] FIG. 2 is a development view of the cylindrical packaging box of this embodiment. [Figure 13] 1A is a bottom view of the cylindrical packaging box of this embodiment, FIG. 1B is a bottom view showing a state in which contents are to be placed, and FIG. 1C is a bottom view showing a state in which the contents are contained. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figs. 1 to 5 show a first embodiment of the present invention, and a cylindrical packaging box 10 of this embodiment is provided by assembling box-body forming pieces 12 formed by punching a paper sheet. Fig. 2 is a development view of the box-body forming piece 12 as seen from the front, and the box-body forming piece 12 has rectangular side surfaces 14, 16 of approximately the same size that are connected in parallel to each other. A glued piece 18 is provided on the side edge of the side surface 16 opposite to the side surface 14, which is glued to the surface of the side surface 14 when the cylindrical packaging box 10 is assembled. The side surfaces 14, 16 and the glued piece 18 are separated by fold lines 20, 22, respectively.

[0014] The side surface 14 is a rectangle that is long in a direction perpendicular to the connecting direction with the side surface 16, and one end portion 14a perpendicular to the connecting direction with the side surface 16 is located at the top when the cylindrical packaging box 10 is assembled and used, and is a straight line parallel to the connecting direction with the side surface 16. The corner of the end portion 14a that contacts the fold line 20 and the corner that contacts the side edge portion 14c opposite the fold line 20 are cut out in a substantially rectangular shape to generate a step 24. Each step 24 is formed by a side edge portion 24a that continues approximately perpendicular to the end portion 14a, and an end portion 24b that continues to the side edge portion 24a and reaches the side edge portion 14c or the fold line 20. The side edge portion 24a is a straight line that is approximately perpendicular to the end portion 14a, and the end portion 24b is provided at an angle that moves away from the end portion 14a as it approaches the side edge portion 14 or the fold line 20, and is formed as an arc that bulges slightly toward the end portion 14a. A break line 26 for opening is provided between the pair of ends 24b. The break line 26 is an arc that bulges slightly toward the end 14a, and a small arc-shaped cut line 28 that bulges away from the end 14a is provided at the center of the break line 26. A fold line 30 is provided in a portion of the side surface 14 close to the break line 26. Both ends of the fold line 30 are located near the position where the end 24b continues to the side edge 14c or the fold line 20, and are triangular in shape with the center part away from the end 14a and convex downward.

[0015] At the end 14b of the side 14 opposite to the end 14a, a locking flap 32 is provided near the center of the end 14b, separated by a fold line 34. The locking flap 32 is a deformed rectangle that is long in the direction along the end 14b, and is slightly shorter than the length of the side 14 in the direction of connection with the side 16. End The locking flap 32 is connected to the end 14b by a thin neck-like portion 33 that is cut out and separated by a short fold line 34. The end 32a of the locking flap 32 opposite the fold line 34 is a straight line parallel to the end 14b and the fold line 34, and a shallow recess 35 is cut out in the center of the end 32a. A pair of side edges 32b of the locking flap 32 that intersect with the end 32a are slightly inclined so as to move away from each other as they move away from the end 32a. The end of the side edges 32b opposite the end 32a does not reach the end 14b and is cut out leaving a neck-like portion 33. The neck-like portion 33, End The length along the direction 14b becomes longer and wider as it moves away from the end 14b. The locking flap 32 is provided with a pair of folding lines 36 on the extension lines of the side edges of the neck-shaped portion 33. The distance between the pair of folding lines 36 becomes longer and wider as it moves away from the end 14b. End The end opposite 14b reaches the corner where end 32a and side edge 32b intersect.

[0016] The side surface 16 is an extension of the end 14a of the side surface 14, and the end 16a intersects the side edge 16c located on the extension of the fold line 20 and the side edge 16d opposite the fold line 20 at a substantially right angle. The end 16b of the side surface 16 opposite the end 16a is provided with a perforated flap 38 near the center of the end 16b, separated by a fold line 42 via a neck portion 40. The perforated flap 38 and the neck portion 40 have the same shape as the locking flap 32 and the neck portion 33. The perforated flap 38 is provided with a pair of fold lines 44 having the same shape as the fold line 36, and the end opposite the neck portion 40 reaches a corner where the end 38a parallel to the end 16b and the side edge 38b continuing from the end 38a intersect. A trapezoidal flap glue portion 46 is provided at the center of the end portion 38a via a fold line 48.

[0017] An opening 50 is provided in the center of the perforated flap 38 for inserting an item 64 to be described later. The opening 50 is a deformed circle, with a portion of it reaching the flap gluing portion 46 beyond the fold line 48, and the peripheral portion 50a located at the flap gluing portion 46 is formed as an arc with a large diameter that is close to a straight line, and is the same arc shape as the recess 35 of the locking flap 32, and has a symmetrical shape with the end portion 32a as the axis. The peripheral portion 50b of the opening 50 located at the perforated flap 38 is a semicircular shape with the diameter in the direction along the fold line 48, and the center of the circle is a semicircular shape that is shifted parallel to the fold line 48 toward the center of the perforated flap 38, and the portion that contacts the fold line 48 is a straight portion 50c.

[0018] The semicircular peripheral portion 50b is provided with four small semicircular tongues 52 that protrude symmetrically toward the center of the opening 50, narrowing the inside diameter. In other words, the insertion diameter, which is the diameter of the envelope connecting the vertices of the four tongue surfaces 52, is smaller than the inside diameter of the opening 50. The peripheral portion 50b is provided with short cut lines 54 that coincide with the base ends of the tongues 52 and run along the protruding direction of the tongues 52. Two cut lines 54 are provided extending from the base end of each tongue 52, and the tongues 52 are formed as straight lines running along the diameter direction of the peripheral portion 50b.

[0019] A rectangular window portion 56 is provided approximately in the center of the side surface 16. The window portion 56 is formed by opening the side surface 16, and has two sides parallel to the end portion 16a, and the two sides intersecting these two sides are inclined so that the distance between them becomes narrower as they move away from the end portion 16a.

[0020] The adhesive piece 18 has an elongated shape that follows the fold line 22, and the end 18a close to the end 16a is located slightly closer to the end 16b than the fold line 30 of the side surface 14 when the cylindrical packaging box 10 is assembled, and is shaped to follow the lower side of the fold line 30, and is inclined so as to approach the end 16b as it moves away from the fold line 22. The end 18b opposite to the end 18a is a straight line that is located on an extension of the end 16b of the adjacent side surface 16.

[0021] Next, an example of a method for assembling the cylindrical packaging box 10 of this embodiment will be described. Note that Fig. 2 shows the front surface of the box-body forming piece 12 of the cylindrical packaging box 10, and a folding method in which the front surface of the box-body forming piece 12 is convex is called a forward folding, and a folding method in which the back surface is convex is called a reverse folding.

[0022] First, the perforated flap 38 is folded forward along the fold line 42 and placed on the back surface of the side surface 16. The locking flap 32 is folded forward along the fold line 34 and placed on the back surface of the side surface 14. The flap gluing portion 46 is then folded backward along the fold line 48 and placed on the front surface of the perforated flap 38. This results in the state shown in FIG. 3. FIG. 3 shows the back surface of the box-forming piece 12. Then, glue 58 is applied to the back surface of the flap gluing portion 46, and glue 60 is applied to the back surface of the side surface 16 near the end 16a. Next, the fold line 20 is folded forward, and the folded back back surface of the flap gluing portion 46 is glued to the front surface of the locking flap 32 with the glue 58. The back surface of the side surface 16 is glued to the back surface of the side surface 14 near the end 14a with the glue 60. Furthermore, glue 62 is applied to the back surface of the glued piece 18, and the fold line 22 is folded forward, so that the back surface of the glued piece 18 is glued to the front surface of the side surface 14. As a result, the pair of side surfaces 14, 16 are overlapped and glued by the glued piece 18, and a pair of side edges on both sides are formed into a cylindrical shape that is continuous with each other, resulting in the folded state of the cylindrical packaging box 10.

[0023] Next, in the product packaging process, the fold lines 20, 22 are pushed toward each other to bend the sides 14, 16 away from each other to form a cylinder with an internal space. At this time, as shown in Figure 4, the locking flap 32 and the perforated flap 38, which are glued together, open at an acute angle from the sides 14, 16 at the fold lines 34, 42, closing the ends of the sides 14, 16 to form the bottom. The opening 50 opens at the bottom and communicates with the internal space, so that a thin cylindrical product, or container 64, can be inserted through the open opening 50, as shown in Figure 5(a).

[0024] The inner diameter of the opening 50 is larger than the outer diameter of the end face of the contents 64, but the four tongues 52 narrow the inner diameter, and the insertion diameter narrowed by the tongues 52, i.e., the diameter of the envelope connecting the vertices of the four tongues 52, is smaller than the outer diameter of the contents 64. Therefore, when the contents 64 pass through the opening 50, the tongues 52 are pushed by the contents 64 and elastically deform, bending toward the inner space, and the contents 64 are smoothly inserted. Since the tongues 52 have a cut line 54 at their base ends and the protruding length of the tongues 52 is long, they easily elastically deform and do not damage the peripheral portion 50b of the opening 50. As the contents 64 are inserted, the locking flap 32 is pushed by the contents 64 and moves to the back side of the side surface 14. The recess 35 of the locking flap 32 and the peripheral edge 50a of the flap glued portion 46 glued to the locking flap 32 coincide and overlap, but the locking flap 32 moves to the back side of the side surface 14, allowing the contents 64 to pass through.

[0025] After the contents 64 pass through the opening 50, as shown in FIG. 5(b), the lower end of the contents 64 is held and contained by the locking flap 32 and the perforated flap 38, which are glued together. The tongue piece 52 recovers its elastic deformation, and the contents 64 cannot pass through the opening 50. No sealing seal or other work is required, and the packaging is completed. If the contents 64 is forcibly removed from the opening 50 in this packaged state, the perforated flap 38 will tear or wrinkle. The contents 64 is supported by abutting against the fold line 48 of the perforated flap 38, which is folded backward at a predetermined angle. The fold line 48 is provided so that the peripheral portion 50a of the opening 50 coincides with the recess 35 of the locking flap 32, and the lower end of the contents 64 is fitted into the peripheral portion 50a and the recess 35, preventing rattling in the direction along the fold line 48.

[0026] A part of the side of the contained item 64 faces the window portion 56 of the side 16 and is visible from the outside. The fold line 30 of the side 14 is gently folded in the normal direction by the thickness of the contained item 64, and even if the end 14a of the side 14 and the end 16a of the side 16 are overlapped, the cross section becomes a cylindrical body with a convex lens shape, and it has a natural appearance.

[0027] When opening the package, the user places his or her fingers on the cut line 28 formed on the side surface 14 and pulls it up, cutting the break line 26 and opening the package, and then removes the contents 64 from the opening.

[0028] The cylindrical packaging box 10 of this embodiment can be packaged with a simple operation, and the appearance of the packaged product is beautiful. An opening 50 having a tongue piece 52 is opened at the bottom, and the contents 64 can be easily inserted through the opening 50 and packaged. The tongue piece 52 holds the contents 64, and the contents are packaged securely. The bottom is closed by the locking flap 32 and the perforated flap 38, and the shape is maintained with a space between the side 14 and the side 16, so that the contents can stand on its own on a shelf in a store, and is suitable for sale and display. After the contents 64 are packaged, they cannot be taken out from the bottom, and if an attempt is made to forcefully take out the contents 64, the bottom will be damaged or wrinkled, so there is also an effect of preventing tampering. Therefore, no seal is required, and the packaging process is simple. The lower end of the contents 64 is inserted into the recess 35 of the end 32a of the locking flap 32 and the peripheral edge 50a of the fold line 48 of the perforated flap 38, and the contents are stably packaged without rattling. The contents 64 can be seen through the window 56. When the contents 64 are inserted, no creases or the like occur, and the fold lines 30 are smoothly folded in the normal direction, forming beautiful curves on the sides 14, 16, forming a cylindrical body with a convex lens-like cross section, and the appearance is good. A break line 26 for opening is provided, and the package can be easily opened by cutting the break line 26.

[0029] Next, a second embodiment of the present invention will be described with reference to Figures 6 to 9. Here, the same members as those in the above embodiment are given the same reference numerals, and the description will be omitted or simplified. A cylindrical packaging box 66 of this embodiment is provided by assembling box body forming pieces formed by punching a paper sheet.

[0030] 7 is a development view of the box-forming piece as seen from the front, with rectangular side surfaces 14, 16 of approximately the same size being provided parallel to each other and connected together. An adhesive piece 72 is provided on the side edge of side surface 16 opposite side surface 14, which is to be glued to the surface of side surface 14 when the cylindrical packaging box 66 is assembled. Side surfaces 14, 16 and adhesive piece 72 are separated by fold lines 20, 22, respectively.

[0031] A rectangular window 67 is provided at approximately the center of the side surface 16. The window 67 is a rectangle that is longer in the vertical direction than the window 56 of the first embodiment, and is formed by opening the side surface 16. It has two sides parallel to the end 16a, and the two sides that intersect with these two sides are formed as straight lines perpendicular to the end 16a until halfway, and then incline so that the distance between them becomes narrower as they move away from the end 16a. The corners at both ends of the end 67a close to the end 16a are formed at 90°, and a part of the upper end of the contained item 64 is fitted into it. A pair of corners close to the end 16b are chamfered.

[0032] A guide piece 68 is integrally provided at the end 32a of the locking flap 32 opposite the fold line 34 at a position where it contacts the side edge portions 32b on both sides. The guide piece 68 is trapezoidal and protrudes from the end 32a. Between the pair of guide pieces 68, at a position adjacent to each guide piece 68, a recess 35 is provided that matches the peripheral portion 50a of the opening 50 of the flap gluing portion 46 in the assembled state of the cylindrical packaging box 66, and the end 32a is left uncut between the pair of recesses 35 to form a rectangular guide protrusion 70. The guide protrusion 70 is rectangular and protrudes less than the guide piece 68.

[0033] The adhesive piece 72 is rectangular in shape with a length in the connecting direction with the side surface 16 being approximately the same size as the side surface 16, and the upper end 72a is provided at the same height as the height at which the side edge 14c of the side surface 14 and the end 24b intersect, and is curved so that the middle of the end 72a approaches the center of the adhesive piece 72. The opposite end 72b is a straight line located on an extension of the end 16b of the adjacent side surface 16.

[0034] The cylindrical packaging box 66 of this embodiment is assembled in the same manner as the above embodiment, and has the same effect when used in the same manner. However, since the adhesive piece 72 is larger than the adhesive piece 18 of the above embodiment, the adhesive piece 72 is applied near the fold line 22 and near the side edge 72c opposite the fold line 22, and is glued to cover the surface of the side 14. This provides high strength and a good appearance. Since the end 72a of the adhesive piece 72 is located below the break line 26 and the cut line 28 of the side 14, the break line 26 and the cut line 28 are exposed, and the box can be easily opened from the cut line 28 and break line 26.

[0035] In addition, in the assembled state, as shown in Fig. 6, a guide protrusion 70 protrudes from the peripheral edge 50a of the perforated flap 38 toward the center of the opening 50. Therefore, the guide protrusion 70 abuts against the bottom of the contained item 64, enabling stable support. A pair of guide pieces 68 provided on the locking flap 32 are erected on both sides of the lower end of the contained item 64. This makes it possible to more reliably prevent rattling in the direction along the fold line 48.

[0036] In addition, as shown in Fig. 8, a guide protrusion 70 protrudes from the peripheral portion 50a of the opening 50 that opens at the bottom. As shown in Fig. 9(a), when the content 64 is inserted through the opening 50, the tongue 52 is pushed by the content 64 and elastically deforms, and the guide protrusion 70 is also pushed by the content 64 and elastically deforms, curving toward the inner space, allowing the content 64 to be smoothly inserted. After the content 64 passes through the opening 50, as shown in Fig. 9(b), the tongue 52 returns to its original elastic deformation, and the content 64 cannot pass through. The guide protrusion 70 also returns to its original elastic deformation and abuts against the lower end of the content 64. Furthermore, the fold line 48 of the perforated flap 38, which is folded back at a specified angle, abuts against the lower end of the contained item 64, and the guide pieces 68 protrude upward from the fold line 48 on both sides of the lower end of the contained item 64, thereby reliably preventing rattling in the direction along the fold line 48 and allowing the contained item 64 to be stored in a cushioned manner more safely.

[0037] The window 67 is provided long, and the upper end of the stored item 64 abuts against the side 67a, so that the upper end can be held without rattling. The lower end of the stored item 64 is sandwiched between a pair of guide pieces 68 to prevent rattling. This allows the stored item 64 to be stored in a cushioned manner.

[0038] Although the cylindrical packaging box 66 is provided with a wide adhesive piece 72, it may be provided with a narrow adhesive piece 18 like the cylindrical packaging box 10 of the first embodiment.

[0039] Next, a third embodiment of the present invention will be described with reference to Fig. 10. Here, the same members as those in the above embodiment are given the same reference numerals, and the description will be omitted or simplified. The cylindrical packaging box 74 of this embodiment is provided by assembling box body forming pieces formed by punching a paper sheet.

[0040] 10 is a development view of the box-forming piece as seen from the front, with rectangular side surfaces 14, 16 of approximately the same size arranged parallel to each other. An adhesive piece 76 is provided on the side edge of side surface 16 opposite side surface 14, which is to be glued to the back surface of side surface 14 when cylindrical packaging box 74 is assembled. Side surfaces 14, 16 and adhesive piece 76 are separated by fold lines 20, 22, respectively.

[0041] The adhesive piece 76 also has a function of supporting the contents 64. The adhesive piece 76 is rectangular in shape with a length in the connecting direction with the side surface 16 being approximately the same size as the side surface 16, and the upper end 76a is located near the middle between the end 16a and the end 16b of the side surface 16, and is formed as a straight line parallel to the end 16a. The part of the end 76a close to the fold line 22 is connected to a side edge 76b that extends toward the end 16a in a straight line parallel to the fold line 22, and an end 76c that faces the fold line 22 at a position close to the end 16a, and an elongated rectangle surrounded by the side edge 76b and the end 76c protrudes from the end 76a and is connected to the fold line 22. The end 76c is shaped to follow the lower side of the fold line 30 in the assembled state, and is inclined so as to approach the end 16b as it moves away from the fold line 22. The end 76d opposite to the end 76a is a straight line located on an extension of the end 16b of the adjacent side surface 16.

[0042] A groove 78 that communicates with the end 76a is provided in the center of the adhesive piece 76. The groove 78 has an arbitrary width that allows a part of the side of the content 64 to be inserted, and a wide portion 80 that is wide in the direction intersecting the end 76a is formed at the tip portion opposite the end 76a. A bottom portion 80a of the wide portion 80 on the end 76d side is a straight line parallel to the end 76d.

[0043] Side 14 End No other members are provided in 14b. The locking flap 32 is provided at the end 76d of the adhesive piece 76, separated by the fold line 34. The locking flap 32 is provided with a pair of guide pieces 68 and a guide protrusion 70 located between the pair of guide pieces 68.

[0044] Next, an example of a method for assembling the cylindrical packaging box 74 of this embodiment will be described. Note that Fig. 10 shows the front surface of the box-forming piece of the cylindrical packaging box 74. First, the perforated flap 38 is folded forward along the fold line 42 and overlapped on the back surface of the side surface 16. The locking flap 32 is folded forward along the fold line 34 and overlapped on the back surface of the glued piece 76. Furthermore, the flap glued portion 46 is folded backward along the fold line 48 and overlapped on the front surface of the perforated flap 38. Then, glue 58 is applied to the back surface of the flap glued portion 46, and glue 60 is applied to the back surface of the side surface 16 near the end portion 16a.

[0045] Thereafter, the fold line 22 is folded forward, and the folded back surface of the flap gluing portion 46 is glued to the front surface of the locking flap 32 with glue 58. Next, glue 62 is applied to the front surface of the glued piece 76. The glue 62 is applied in a straight line from end 76c to end 76d along the fold line 22, and also in a straight line from end 76a to end 76d along the side edge 76e opposite the fold line 22. Next, the fold line 20 is folded forward, and the back surface of the side surface 16 is glued to the vicinity of end 14a of the back surface of the side surface 14 with glue 60, and the front surface of the glued piece 76 is glued to the back surface of the side surface 14 with glue 62. This completes the folded state of the cylindrical packaging box 74.

[0046] Thereafter, in the product packaging process, as in the above-described embodiment, the fold lines 20, 22 are pushed toward each other to bend the sides 14, 16 away from each other to form a cylinder with an internal space, and the contents 64 are inserted through the opening 50 to be contained in the internal space. The method of using the cylindrical packaging box 66 of this embodiment is the same as in the above-described embodiments.

[0047] The cylindrical packaging box 66 of this embodiment has the same effect as each of the above-mentioned embodiments. Furthermore, the groove 78 of the adhesive piece 76 glued to the back surface of the side surface 14 is located in the inner space, and the side surface of the contained item 64 is held in the groove 78. In particular, since the groove 78 has a step of one paper sheet, the contained item 64 does not move even if it is subjected to vibration in the left-right direction. Furthermore, the lower end of the contained item 64 abuts against the bottom 80a of the wide portion 80 of the groove 78, and does not move even if it is subjected to vibration in the up-down direction.

[0048] Next, a fourth embodiment of the present invention will be described with reference to Figures 11 to 13. Here, the same members as those in the above-mentioned embodiment are given the same reference numerals, and the description will be omitted or simplified. The cylindrical packaging box 82 of this embodiment is for containing an item 92 having an elliptical cylindrical cross-sectional shape, and is provided by assembling box-forming pieces formed by punching a paper sheet.

[0049] 12 is a development view of the box-forming piece as seen from the front, with rectangular side surfaces 14, 16 of approximately the same size provided parallel to each other and connected together. An adhesive piece 76 is provided on the side edge of side surface 16 opposite side surface 14, which is to be glued to the back surface of side surface 14 when cylindrical packaging box 74 is assembled. Side surfaces 14, 16 and adhesive piece 76 are separated by fold lines 20, 22, respectively.

[0050] The glued piece 76 is rectangular in shape with a length in the connecting direction with the side surface 16 being approximately the same size as the side surface 16, and a groove 78 communicating with the end portion 76a is provided in the center of the glued piece 76. A wide portion 80 is formed at the tip portion of the groove portion 78 on the opposite side to the end portion 76a, and a bottom portion 80a of the wide portion 80 on the end portion 76d side is a straight line parallel to the end portion 76d.

[0051] The locking flap 32 is provided at an end 76d of the adhesive piece 76, separated by a fold line 34. The locking flap 32 is provided with a pair of guide pieces 68 and a guide protrusion 70 positioned between the pair of guide pieces 68.

[0052] In the portion of the side surface 14 near the break line 26, the end portion 24b is connected to the side edge portion 14 of the side surface 14. c Alternatively, fold line 84 is provided between adjacent positions of fold line 20. Fold line 84 is an arc shape with its center away from end 14a.

[0053] A perforated flap 38 is provided near the center of the end 16b of the side surface 16, separated by a fold line 42 through a neck-shaped portion 40. A pair of fold lines 44 is provided in the perforated flap 38, and a cut line 86 is provided between the pair of fold lines 44, passing near the center of the perforated flap 38. Both ends of the cut line 86 that are continuous with the fold line 44 are bent along the fold line 44 toward the fold line 42. An opening 88 is provided in the center of the perforated flap 38. The peripheral portion of the opening 88 on the fold line 42 side coincides with the cut line 86, and both peripheral portions 88a on both sides that intersect with the cut line 86 are formed as arcs that bulge slightly outward. Each of the pair of peripheral portions 88a is provided with a small semicircular tongue 52 that protrudes toward the center of the opening 88. A short cut line 54 is provided in a portion of the peripheral portion 88a that coincides with the peripheral portion of the tongue piece 52. Two cut lines 54 are provided extending from the base end of one tongue piece 52, and the tongue piece 52 is formed as a straight line along the diameter direction of the peripheral portion 88a. An opening bend line 90 is provided on the outside of the peripheral portion 88a, connecting a position between the tongue piece 52 and the fold line 48 and a position where the fold line 44 and the cutting line 86 intersect. The opening bend line 90 is formed as a circular arc that bulges out toward the fold line 48.

[0054] A trapezoidal flap gluing portion 46 is provided at the center of the end portion 38a of the perforated flap 38 opposite the neck portion 40 via a fold line 48. A portion of the opening 88 extends beyond the fold line 48 to reach the flap gluing portion 46, and a peripheral portion 88b located at the flap gluing portion 46 is formed as an arc with a large diameter that is close to a straight line.

[0055] The cylindrical packaging box 82 of this embodiment is assembled in the same manner as the above embodiment and is used in the same manner. However, since the perforated flap 38 is provided with a cutting line 86 and a bending line 90 for opening, when the opening 88 is opened at the bottom, the inner diameter of the opening 88 becomes larger due to the cutting line 86. Also, by folding the part of the peripheral portion 88b where the tongue piece 52 is provided at the bending line 90 for opening in the normal direction, the inside of the bending line 90 for opening and the tongue piece 52 can be largely elastically deformed.

[0056] Next, the process of inserting the contents 92 having an elliptical cross-sectional shape will be described. As shown in FIG. 13(a), the fold lines 20, 22 are pushed closer to each other, and the sides 14, 16 are bent away from each other to create an internal space, and the locking flap 32 and the perforated flap 38 become the bottom. The opening 88 opens at the bottom and communicates with the internal space. As shown in FIG. 13(b), the contents 92 having an elliptical cross-sectional shape is inserted from the opened opening 88. The long diameter direction of the contents 92 is set perpendicular to the cutting line 86. The opening 88 has a diameter smaller than the long diameter of the contents 92, but the cutting line 86 opens and becomes larger when pushed by the contents 92, allowing the contents 92 to pass through. When passing through the opening 88, the tongue 52 is pushed by the contents 64 and elastically deforms, and the opening bending line 90 is slightly folded forward to make the opening 88 wider, allowing the contents 92 to be smoothly inserted. After the content 92 has passed through the opening 88, as shown in Fig. 13(c), the long diameter direction of the content 92 is made parallel to the cutting line 86. This closes the cutting line 86, restores the normal fold of the opening bend line 90, and the content 92 cannot pass through the opening 88, completing the packaging.

[0057] The cylindrical packaging box 82 of this embodiment has the same effect as the above embodiment. Moreover, the contents 92 having an elliptical cross section can be inserted and stored without damaging the bottom of the cylindrical packaging box 82. To insert the elliptical contents 92, it is possible to make the opening 88 elliptical in the left-right direction, but this would result in a problem that the perforated flap 38 would become large and the box-forming piece would become large. However, the cylindrical packaging box 82 can store the contents 92 by making the major axis direction of the contents 92 perpendicular to the cutting line 86, screwing it in, and then returning the major axis direction to parallel to the cutting line 86 without making the box-forming piece larger.

[0058] The present invention is not limited to the above embodiment. The size and shape of the side, window, and opening can be changed according to the contents. The number and shape of the tongue and the cut lines can also be freely changed. For example, the base end of the tongue may be provided with a break line or a pressed line that crosses the protruding direction of the tongue to make it easier to fold. Alternatively, a plurality of cut lines may be provided in the radial direction on the periphery of the opening, and the part between the pair of cut lines may become the tongue. The locking flap and the perforated flap may be provided in any order on the adjacent side or glued piece. The window may be left perforated or a film may be attached. The window may be used when the design of the cylindrical packaging box or the slight rattle of the contents is not a problem, and the window may not be required. [Explanation of symbols]

[0059] 10,66,74,82 Cylindrical packaging box 12 Box forming piece 14,16 Side 14b,16b end 18,72,76 Glued piece 20,22 Fold lines 26 Break Line 32 Locking flap 36,44 Folding line 38 Perforated flap 46 Flap gluing section 50 Opening 50a, 50b Periphery 52 Tongue piece 54 Cut line 64,92 Contents 78 Groove 86 Cutting line

Claims

1. A cylindrical packaging box is made of a single box-forming piece, and has a pair of overlapping side surfaces, a pair of side edges that are continuous with each other and are formed into a cylindrical shape. The pair of side surfaces are curved away from each other to accommodate an item in an inner space. The pair of cylindrical lower ends of the side surfaces are closed by perforated flaps, and the perforated flaps are provided with an opening for inserting the contents, and the inner diameter of the opening is larger than the outer diameter of the contents, A tongue piece is provided on the periphery of the opening, protruding toward the center of the opening, and the insertion diameter of the opening narrowed by the tongue piece is smaller than the outer diameter of the content, and a cut line is provided on the periphery of the opening at the base end of the tongue piece along the protruding direction of the tongue piece, The box-forming piece is provided such that the pair of side surfaces are divided by a fold line, and a glue piece to be glued to the other side surface is provided at a side edge portion of one of the pair of side surfaces, the glue piece being separated by the fold line; A locking flap is provided at an end of one of the pair of side surfaces that is positioned downward when the cylindrical packaging box is assembled and used, and the perforated flap is provided at an end of the other side surface that is positioned downward, a shallow recess is cut out in the locking flap, and the opening, the tongue piece, and the cut line are provided in the center of the perforated flap, The end of the perforated flap is provided with a flap glue portion that is glued to the locking flap, and the end of the cylindrical lower part of the side surface is closed by gluing the flap glue portion to the locking flap, When assembled and used, the peripheral edge of the opening of the perforated flap is aligned with the recess of the locking flap, and the lower end of the contents is fitted into the peripheral edge and the recess; The cylindrical packaging box is characterized in that the locking flap and the perforated flap are provided with folding lines that are pressed by the side surfaces and folded when the pair of side surfaces are bent in directions away from each other.

2. 2. The cylindrical packaging box according to claim 1, wherein a plurality of said tongue pieces are provided.

3. 2. The cylindrical packaging box according to claim 1, wherein a cutting line is formed in the perforated flap that communicates with the opening, and when the cutting line is opened, the opening opens wide in a direction intersecting the cutting line to allow the contents to pass through, and after the contents have passed through, the cutting line is closed.

4. A cylindrical packaging box as described in claim 1, wherein the adhesive piece has a groove portion formed to hold the contents.

5. 2. The cylindrical packaging box according to claim 1, wherein one of the pair of side surfaces is provided with a break line for opening.

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