Packaging containers

Abstract

The present invention provides a storage container that allows for easy opening of the opening tab in both the left-to-right and right-to-left directions. [Solution] Based on a reference line BL that bisects the maximum height perpendicular to the longitudinal direction DL in the adhesive portion 21C, the area of ​​the front plate that is included within 25% of the maximum height on both the opening side and the bottom plate side is defined as the allowable area TA. The cut line 32C has a first cut line element 32C1 located on the bottom plate side of the adhesive portion 21C and a second cut line element 32C2 located on the opening side of the adhesive portion 21C. When the end on the opening side of the first cut line element 32C1 is defined as the first end C11 and the end on the bottom plate side of the second cut line element 32C2 is defined as the second end C22, the first end C11 or the second end C22 is located within the allowable area TA. The packaging container has a connecting portion 21E between the first end C11 and the second end C22.

Description

[Technical Field]

[0001] This disclosure relates to packaging containers. [Background technology]

[0002] A packaging container for a roll of material has a container body with an open top and a lid connected to one of the top edges of the container body. An example of a roll of material is plastic wrap. The lid comprises a lid plate that covers the opening, a cover piece connected to the front of the lid plate, and an opening piece connected to the cover piece via a perforated line. When the lid is closed, the cover piece overlaps with the front plate of the container body. The opening piece is attached to the front plate by an adhesive portion located on the surface of the front plate. The user of the packaging container can open it by cutting the opening piece along the perforated line.

[0003] The first example of a packaging container is a cardboard box for storing plastic wrap. In this cardboard box, opening tabs are provided along the lower edge of the front panel of the lid via intermittent perforations. The front panel of the container body has a circular half-cut line. The half-cut line surrounds the adhesive area.

[0004] In the first embodiment of the cardboard box for storing plastic wrap, the opening tab has two or more semicircular cuts. Each cut is positioned to correspond to the left semicircle of the semicircle, or to the right semicircle of the semicircle, when the opening tab covers the front panel.

[0005] In a second embodiment of a cardboard box for storing plastic wrap, the opening tab is provided with two or more pairs of semicircular perforations. With the opening tab covering the front panel, in each pair of perforations, one perforation is positioned to correspond to the left semicircle of the semicircle, and the other perforation is positioned to correspond to the right semicircle of the semicircle. The diameter of one perforation is different from the diameter of the other perforation (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2003-291960 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Incidentally, in the first form of the paper box for storing plastic wrap, when the opening piece is opened in the opposite direction to the direction in which the slit protruding from the vertical short slits connecting the opening pieces extends, the opening piece may tear from both ends of the semicircular slit formed on the opening piece. Therefore, in the first form, the opening piece is difficult to open from the opposite direction to the direction in which the semicircular slit protrudes. Furthermore, in the second form of the paper box for storing plastic wrap, regardless of the opening direction of the opening piece, there is a semicircular slit protruding in the direction of opening, so the opening piece may tear from both ends of the slit. Therefore, in the second form, the opening piece is difficult to open in both the left-to-right and right-to-left directions. [Means for solving the problem]

[0008] A packaging container for solving the above problems comprises a container body having a front plate, a bottom plate, and a rear plate, with an open top surface, and a lid connected to the upper edge of the rear plate. The lid comprises a lid plate that covers the opening, a cover piece connected to the tip of the lid plate, and an opening piece connected to the tip edge of the cover piece via a cut line and adhered to the front plate of the container body. The lid of the packaging container is opened by cutting the opening piece in the opening direction. Multiple adhesive portions are provided along the opening direction of the container body for adhering the opening piece to the front plate. When the opening piece is viewed from the front with the opening piece and the front plate bonded together at the adhesive portion, the opening piece has a cut line located on at least one of the left and right sides of each adhesive portion. With respect to a reference line that bisects the maximum height in the longitudinal direction, which is parallel to the front edge of the bottom plate in the adhesive portion, the area of ​​the front plate that is included within 25% of the maximum height on both the opening side and the bottom plate side is defined as the allowable area. More than 50% of all the cut lines have a first cut line element located on the bottom plate side of the adhesive portion and a second cut line element located on the opening side of the adhesive portion. When the end on the opening side of the first cut line element is defined as the first end and the end on the bottom plate side of the second cut line element is defined as the second end, the first end or the second end is located within the allowable area. The packaging container has a joint between the first end and the second end.

[0009] According to the above configuration, since the connecting portion is located between the first cut line element and the second cut line element, even when the opening piece is opened from a direction opposite to the direction from the adhesive portion toward the cut line, an external force acts on the adhesive portion through the connecting portion. Furthermore, if the cut lines having the first cut line element and the second cut line element account for 50% or more of all cut lines, the adhesive portion will peel off from the rear end in the opening direction, making it easier to open the opening piece.

[0010] In the above-described packaging container, the length between the first end and the second end is the length of the connecting portion, and the length of the connecting portion may be 0.5 mm or more and 3.0 mm or less. According to the above configuration, if the length of the connecting portion is 0.5 mm or more, it is possible to increase the certainty that an external force acts on the adhesive portion when the opening piece is opened from the direction opposite to the direction from the adhesive portion toward the cut line. If the length of the connecting portion is 3.0 mm or less, even if the base paper (backing paper) on the back of the opening piece tears and remains on the container body side when the opening piece is opened from the direction from the adhesive portion toward the cut line, the cut line cuts through the backing paper, so it is possible to prevent the backing paper of the opening piece from delaminating and spreading in the opening direction.

[0011] In the above-described packaging container, when a virtual line is set that is parallel to the front edge of the bottom plate and passes through the allowable area, the first end and the second end may be located on the virtual line.

[0012] When the opening piece is opened from the direction toward the cut line from the adhesive joint, the opening piece is usually opened by the surface layer on the adhesive side of the front panel. However, delamination may occur on the back surface of the opening piece rather than the surface layer on the adhesive side of the front panel, causing the backing paper of the opening piece to adhere to the adhesive joint. In this case, the cut line adjacent to the adhesive joint cuts the backing paper of the opening piece, preventing the delamination from progressing in the opening direction.

[0013] According to the above configuration, the first end and the second end are positioned at different locations on the same imaginary line in the direction in which the imaginary line extends. Therefore, even if the backing paper is not cut sufficiently at the end that is close to the adhesive part, the backing paper will still be cut at the end that is farther from the adhesive part. This increases the certainty that delamination of the opening piece will not progress in the opening direction.

[0014] In the above-described packaging container, when a virtual line is set that is parallel to the front edge of the bottom plate and passes through the allowable area, the first end or the second end may be located on the virtual line.

[0015] According to the above configuration, in the direction orthogonal to the direction in which the virtual line extends, the first end portion and the second end portion are arranged at different positions from each other. Therefore, when the opening piece is opened from the direction from the cut line toward the bonding portion, the connecting portion and then the rear end of the bonding portion are in a positional relationship to be opened, so that an external force easily acts on the rear end of the bonding portion.

[0016] In the above packaging container, in the longitudinal direction, the distance between the end portion of the cut line closest to the bonding portion among the first end portion and the second end portion and the bonding portion may be 0.5 mm or more and 3.0 mm or less.

[0017] According to the above configuration, since the distance between the end portion of the cut line and the bonding portion is 0.5 mm or more, when the opening piece is opened in the direction from the cut line toward the bonding portion, the external force acting on the opening piece easily transmits to the bonding portion. Since the distance between the end portion of the cut line and the bonding portion is 3.0 mm or less, when the opening piece is opened in the direction from the bonding portion toward the cut line, an increase in the progress amount of delamination along the opening direction can be suppressed.

[0018] In the above packaging container, the first cut line element and the second cut line element may each be composed of a straight line, a curve, or a combination of a straight line and a curve. According to the above configuration, since each cut line element is composed of any one of a straight line, a curve, and a combination of a straight line and a curve, the degree of freedom in the shape of the cut line can be increased.

Effect of the Invention

[0019] According to the packaging container of the present disclosure, it is possible to easily open the opening piece in both the direction from left to right and the direction from right to left.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is a perspective view of the wound body storage box before opening as seen from the upper right front. [Figure 2]Figure 2 is a perspective view of the unpacked coil storage box, seen from the upper right front. [Figure 3] Figure 3 is a plan view showing an intermediate structure for manufacturing a coiled material storage box. [Figure 4] Figure 4 is a plan view showing the structure of the first adhesive joint. [Figure 5] Figure 5 is a plan view showing the first adhesive portion of the front panel and the cut line of the opening piece side by side. [Figure 6] Figure 6 is a plan view showing the second adhesive portion of the front panel and the cut line of the opening piece side by side. [Figure 7] Figure 7 is a plan view showing the first adhesive portion of the front panel and a first modified example of the cut line on the opening piece side by side. [Figure 8] Figure 8 is a plan view showing the second adhesive portion of the front panel and the first modified example of the cut line on the opening piece side by side. [Figure 9] Figure 9 is a diagram illustrating the function of the cut line when the opening piece is opened from the first opening direction. [Figure 10] Figure 10 is a diagram illustrating the function of the cut line when the opening piece is opened from the second opening direction. [Figure 11] Figure 11 is a diagram illustrating the function of the cut line when a conventional opening piece with a cut line is opened from the first opening direction. [Figure 12] Figure 12 is a diagram illustrating the function of the cut line when a conventional opening piece with a cut line is opened from the second opening direction. [Figure 13] Figure 13 is a plan view showing side by side the first adhesive portion of the front panel and a second modified example of the cut line on the opening piece. [Figure 14] Figure 14 is a plan view showing the first adhesive portion of the front panel and a third modified example of the cut line on the opening piece side by side. [Modes for carrying out the invention]

[0021] An embodiment of a packaging container will be described with reference to Figures 1 to 14. In this embodiment, a rolled-up body storage box, which is an example of a packaging container, will be described. [Wound body 50R] Figure 1 shows the rolled material storage box 10 before opening. As shown in Figure 2, the rolled material storage box 10 contains a rolled wrap film (hereinafter also simply referred to as the rolled material 50R). The rolled material storage box 10 has a rectangular parallelepiped shape extending in one direction. The rolled material storage box 10 is manufactured by folding and bonding an intermediate body (see Figure 3) made of a single sheet of cardboard, such as coated cardboard, along the score lines L, LT, LT2, and LR.

[0022] The winding body 50R comprises a paper tube 50C that serves as a core material and a wrap film 50. The wrap film 50, which is in a roll shape, is wound around the tube 50C. The axial length A of the tube 50C is longer than the widthwise length of the wrap film 50. Both ends of the tube 50C in the axial direction A protrude from the film ends of the wound wrap film 50.

[0023] The wrap film 50 is, for example, a film made from one of the materials selected from the group consisting of polyvinylidene chloride, polyvinyl chloride, polyethylene, and polymethylpentene, or a multilayer film combining these materials, but is not limited thereto. The thickness of the wrap film 50 is not particularly limited, but may be between 1 μm and 50 μm.

[0024] [Revolving material storage box 10] As shown in Figure 2, the winding material storage box 10 comprises a container body 20 and a lid 30. The container body 20 has a rectangular parallelepiped shape with an open top. The container body 20 partitions the space for storing the contents, which are the winding material 50R. The container body 20 comprises a front plate 21, a rear plate 22, a right side plate 23, a left side plate 24, and a bottom plate 25. The right side plate 23 and the left side plate 24 form a pair of side plates on the left and right. The front plate 21, rear plate 22, right side plate 23, and left side plate 24 are erected from the bottom plate 25 and form a single peripheral wall.

[0025] The materials that make up the container body 20 and the lid 30 may be, for example, plastic, corrugated cardboard, laminated board made by stacking multiple sheets of cardboard, or a single sheet of cardboard. From the standpoint of ease of handling during the manufacture of the rolled-up material storage box 10, the materials that make up the container body 20 and the lid 30 are preferably cardboard such as coated cardboard.

[0026] The opening 20T, which is the top opening of the container body 20, is demarcated by the upper edge of the peripheral wall. The wound body 50R is inserted and removed through the opening 20T. The axial direction A of the wound body 50R is approximately parallel to the direction in which the wound body storage box 10 extends.

[0027] In the following description, the side of the opening 20T relative to the bottom plate 25 will be referred to as the upper side, and the side of the bottom plate 25 relative to the opening 20T will be referred to as the lower side. Also, the side of the rear plate 22 relative to the front plate 21 will be referred to as the rear side, and the side of the front plate 21 relative to the rear plate 22 will be referred to as the front side. Furthermore, the side of the left side plate 24 relative to the right side plate 23 will be referred to as the left side, and the side of the right side plate 23 relative to the left side plate 24 will be referred to as the right side. The direction from the front plate 21 toward the rear plate 22 is the front-to-back direction DW. The direction from the bottom plate 25 toward the opening 20T is the height direction DH.

[0028] The front plate 21, rear plate 22, and bottom plate 25 each have a rectangular plate shape extending in the longitudinal direction DL. The front plate 21 and rear plate 22 face each other in the front-to-back direction DW. The front edge 25F of the bottom plate 25 is the bottom edge 21U of the front plate 21, and the rear edge of the bottom plate 25 is the bottom edge of the rear plate 22. The direction in which the front edge 25F of the bottom plate 25 extends, i.e., the direction in which the bottom edge 21U of the front plate 21 extends, and the direction parallel to the bottom edge 21U of the front plate 21, is the longitudinal direction DL. The right side plate 23 and left side plate 24 have a rectangular plate shape and face each other in the longitudinal direction DL. The bottom edge of the right side plate 23 connects to the bottom edge 21U of the front plate 21, the bottom edge of the rear plate 22, and the right side of the bottom plate 25. The bottom edge of the left side plate 24 also connects to the bottom edge of the front plate 21, the bottom edge of the rear plate 22, and the left side of the bottom plate 25.

[0029] The front plate 21 comprises a main front plate 21B and a sub-front plate 21A. The main front plate 21B and the sub-front plate 21A overlap in the front-to-back direction DW. The main front plate 21B constitutes the front surface of the front plate 21. The front surface of the front plate 21 is the surface (outer surface) of the front plate 21. The sub-front plate 21A constitutes the back surface of the front plate 21. The back surface of the front plate 21 constitutes the inner surface of the container body 20. The sub-front plate 21A is connected to the main front plate 21B at its upper edge, the front plate end edge 21T. The sub-front plate 21A is bent inward into the container body 20 at the front plate end edge 21T relative to the main front plate 21B.

[0030] A central fastening portion 21S, which is a varnished layer for temporarily fastening the wrap film 50, is located on the front surface of the front panel 21. The front surface of the front panel 21 is provided with a pair of flaps 21F on the left and right sides. The flaps 21F are located closer to the front panel edge 21T than the center in the height direction DH within the main front panel 21B, and are positioned to sandwich the central fastening portion 21S in the opening direction. The flaps 21F have a front surface. The front surface of the flap 21F is the outer surface of the flap 21F. A varnished layer for temporarily fastening the wrap film 50 may be provided on the front surface of the flap 21F.

[0031] The flap 21F is demarcated by a cutting line 21FC. The cutting line 21FC has a curved shape with both ends near the front edge 21T of the main front panel 21B. The cutting line 21FC has a curved shape that is convex toward the bottom panel 25 from one end near the front edge 21T of the main front panel 21B toward the other end in the vicinity. The flap 21F is enclosed by a portion of the front edge 21T and the cutting line 21FC. An example of the length DL in the longitudinal direction of the flap 21F is 1 / 3 to 1 / 2 of the length DL in the longitudinal direction of the main front panel 21B. In the opening direction, the flap 21F is located on the left and right sides of the center of the main front panel 21B in the opening direction. The cutting line 21FC may also have a curved shape with both ends near the front edge 21T of the main front panel 21B.

[0032] The main front plate 21B is bent at its front edge 21T relative to the sub-front plate 21A, thereby applying a restoring force of the cardboard to the area near the front edge 21T within the front plate 21, causing the flap 21F to unfold. When the lid 30 is opened and the opening 20T opens, the flap 21F rotates forward of the container body 20 and lifts up from the front surface of the front plate 21. The flap 21F lifting up from the front surface of the front plate 21 causes the wrap film 50, which has been pulled out and cut from the opening 20T, to lift up from the front surface of the front plate 21.

[0033] The central fastening portion 21S comprises a varnish coating layer having multiple rectangular shapes arranged in the opening direction. The position of the central fastening portion 21S is on the front surface of the front plate 21, closer to the front plate edge 21T than the center in the height direction DH, and includes the center in the opening direction. The central fastening portion 21S is preferably formed of UV-curable varnish, but is not limited to this as long as it can temporarily fasten the wrap film 50. The central fastening portion 21S temporarily fastens the wrap film 50, which is pulled out from the opening 20T of the container body 20 and hangs down from the front plate edge 21T of the front plate 21, to the front surface of the front plate 21.

[0034] The upper part of the sub-front plate 21A is provided with restrictive pieces 3R and 4R extending in the front-rear direction DW. The restrictive pieces 3R and 4R are located at both the left and right ends of the front plate end edge 21T, which is the upper edge of the sub-front plate 21A. The restrictive pieces 3R and 4R are bent along the score line LR (see Figure 3) relative to the sub-front plate 21A and protrude from the front plate end edge 21T toward the rear plate 22. When the wrap film 50 is pulled out from the container body 20, the restrictive pieces 3R and 4R contact the cylindrical body 50C of the winding body 50R from the front and above. In this way, the restrictive pieces 3R and 4R prevent the winding body 50R from flying out of the container body 20.

[0035] The right side plate 23 is equipped with right flaps 13F, 23F, and 53F, and is constructed by bonding the right flap 53F to the right flap 13F and the right flap 23F. The right side plate 23 is equipped with a lid locking piece 3T that extends in the front-rear direction DW. The lid locking piece 3T is connected to the upper edge 3E of the right side plate 23. The lid locking piece 3T is bent to the right side of the container body 20 at the upper edge 3E of the right side plate 23 (see the grid line LT2: Figure 3) and protrudes to the right side of the container body 20. The lid locking piece 3T extends in the front-rear direction DW.

[0036] The left side plate 24 is equipped with left flaps 14F, 24F, and 54F, and is constructed by bonding the left flap 54F to the left flap 14F and the left flap 24F. The left side plate 24 is equipped with a lid locking piece 4T that extends in the front-rear direction DW. The lid locking piece 4T is connected to the upper edge 4E of the left side plate 24. The lid locking piece 4T is bent to the left side of the container body 20 at the upper edge 4E of the left side plate 24 (scribe line LT2: see Figure 3) and protrudes to the left side of the container body 20. The lid locking piece 4T extends in the front-rear direction DW.

[0037] Returning to Figure 1, the container body 20 is provided with multiple adhesive portions 21C. The multiple adhesive portions 21C are located on the surface of the main front plate 21B, which is the front surface of the front plate 21 of the container body 20. Figure 1 shows the overlapping state of the adhesive portions 21C provided on the front plate 21 and the lid 30. Each adhesive portion 21C adheres the front plate 21 of the container body 20 to the lid 30. The multiple adhesive portions 21C are arranged with intervals along the opening direction. The opening direction is from the right side plate 23 toward the left side plate 24, or from the left side plate 24 toward the right side plate 23.

[0038] At least one of the multiple adhesive portions 21C is the first adhesive portion 21C1. In the example shown in Figure 1, the adhesive portions 21C located at both ends in the opening direction are the first adhesive portions 21C1. The adhesive portions other than the first adhesive portions 21C1 are the second adhesive portions 21C2. In the opening direction, the multiple second adhesive portions 21C2 are sandwiched between a pair of first adhesive portions 21C1.

[0039] The shape of the first adhesive portion 21C1 is different from the shape of the second adhesive portion 21C2. The second adhesive portion 21C2 has a circular shape. The area of ​​the first adhesive portion 21C1 is larger than the area of ​​the second adhesive portion 21C2.

[0040] There are no half-cut lines around the adhesive portion 21C in the container body 20. The front plate 21 of the container body 20 does not have half-cut lines. A half-cut line is a line in which a cut is made in the thickness direction of paper such as cardboard, from the surface side of the paper to about half of its thickness. In this disclosure, the front plate 21 has a starting point on the surface of the front plate 21 and a depth that reaches partway through the front plate 21 in the thickness direction. The area around the adhesive portion 21C in the container body 20 may be the area of ​​the front plate 21 that surrounds the adhesive portion 21C, or it may be the area that overlaps with the adhesive portion 21C.

[0041] In this way, since there are no half-cut lines around the adhesive portion 21C, the base paper of the front plate 21 is peeled off closer to the surface of the front plate 21, and as a result, the appearance of the adhesive portion 21C after opening can be improved.

[0042] [Cover 30] Returning to Figure 1, the lid 30 comprises a lid plate 31, a front lid plate 32, a right side lid plate 33, and a left side lid plate 34. The lid plate 31 is rotatably connected to the upper edge 22T (see Figure 2) of the rear plate 22. The lid plate 31 rotates relative to the container body 20 around the upper edge 22T of the rear plate 22, opening and closing the opening 20T of the container body 20. The lid plate 31 closes the opening 20T by covering it.

[0043] The front lid plate 32 and the front plate 21 are both rectangular plates of approximately the same shape. The upper edge of the front lid plate 32 is the front edge (tip) of the lid plate 31, so the front lid plate 32 is connected to the tip of the lid plate 31. The front lid plate 32 covers the entire front surface of the front plate 21 when the lid body 30 is closed and the opening 20T is closed. The front lid plate 32 has multiple cut lines 32C below the midpoint of the height direction DH. The cut lines 32C are positioned to surround one of the adhesive portions 21C provided on the front surface of the front plate 21. As shown in Figure 1, the front lid plate 32 is bonded to the adhesive portion 21C inside the cut lines 32C.

[0044] The front lid plate 32 has a cut line 32M extending across its entire width in the opening direction, approximately in the center of the height direction DH. The cut line 32M has a V-shape that protrudes downward. The cut line 32M may also have an arc shape or a straight line that protrudes downward, and is not particularly limited. The right end of the cut line 32M is an opening end 32N for dividing the front lid plate 32 vertically along the cut line 32M. The opening end 32N is provided at the right end of the cut line 32M.

[0045] The front lid plate 32 has a cover piece 32P and an opening piece 32K connected to the tip edge of the cover piece 32P via a cut line 32M, and the opening piece 32K is bonded to the front surface of the front plate 21 by an adhesive portion 21C. As shown in Figure 1, the opening piece 32K is bonded to the front surface of the front plate 21 inside the cut line 32C.

[0046] The lid 30 is opened when the opening piece 32K is cut from the opening end 32N toward the left end of the cut line 32M in the opening direction. In other words, the lid 30 is opened when the opening piece 32K is cut from right to left in the opening direction. The lid 30 can also be opened when the opening piece 32K is cut from left to right in the opening direction.

[0047] When the opening end 32N is pulled forward, the front lid plate 32 is cut along the cut line 32M. Also, the adhesive between the front plate 21 and the front lid plate 32 on the inside of the cut line 32C is peeled away. As a result, the front lid plate 32 is divided into an upper and lower section along the cut line 32M, with the entire width of the front lid plate 32 in the opening direction being divided into an upper and lower section. The upper section of the front lid plate 32, partitioned by the cut line 32M, is the cover piece 32P. The lower section of the front lid plate 32, partitioned by the cut line 32M, is the opening piece 32K. Of the cover piece 32P, the edge that faces the front edge of the lid plate 31 in the height direction DH is the tip edge of the cover piece 32P.

[0048] Returning to Figure 2, the opening piece 32K is detached from the container body 20 when the wrap film 50 is first used. When the opening piece 32K is detached from the lid piece 32P, the entire cutting edge of the cutting blade 35 is exposed from the tip of the lid piece 32P. Then, the opening 20T of the container body 20 opens as the lid 30 rotates on the upper edge 22T of the rear plate 22.

[0049] The cover piece 32P has a plate-like shape that extends downward from the front edge of the cover plate 31 when the cover body 30 is closed and the opening 20T is blocked, and covers the upper front surface of the front plate 21. The width of the cover piece 32P in the height direction DH is greatest in the center in the opening direction, except for both ends in the opening direction, and the width in the height direction DH decreases as you move from the center in the opening direction to each end. A cutting blade 35 is joined to the inner surface of the cover piece 32P.

[0050] The cutting blade 35 has a sawtooth shape with cutting edges aligned in the opening direction. The cutting blade 35 is joined to the cover piece 32P such that, when the lid 30 is closed and the opening 20T is sealed, multiple cutting edges protrude downward from the cover piece 32P. The cutting blade 35 is joined to the cover piece 32P by, for example, ultrasonic bonding with a sealant layer or adhesive layer interposed between the cover piece 32P and the cutting blade 35. Alternatively, the cutting blade 35 can be joined to the cover piece 32P by laminating a sealant layer onto the resin layer of the blade material that constitutes the cutting blade 35.

[0051] The material constituting the cutting blade 35 is not particularly limited and may be, for example, resin or metal. The cutting blade 35 may include, for example, resin and an additive, and the rigidity of the cutting blade 35 and its adhesion to the cover piece 32P can be adjusted by the type and amount of the additive.

[0052] The resins that make up the cutting blade 35 include, for example, polyester resins such as polylactic acid and polyethylene terephthalate, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether ether ketone) resin, and PES (polyether sulfone) resin. The additives that make up the cutting blade 35 include, for example, resins such as olefin-based resins, and inorganic materials such as barium sulfate, calcium carbonate, titanium dioxide, silica, and talc. The resin that makes up the sealant layer is, for example, a modified polyolefin in which functional groups have been introduced into polyolefin to impart adhesive properties.

[0053] The cutting edge of the cutting blade 35 has a V-shape that protrudes downward when the lid 30 is closed and the opening 20T is blocked. That is, the cutting edge of the cutting blade 35 is composed of a central part in the opening direction and both ends that sandwich the central part in the opening direction, and the central part has a V-shape that protrudes toward the bottom plate 25 more than the ends when the lid is closed. The length of the longitudinal DL in the central part of the cutting blade 35 is, for example, 1 / 3 of the length of the longitudinal DL of the entire cutting blade 35. The cutting blade 35 is not particularly limited in that the central part may have an arc shape that protrudes downward more than the ends when the lid is closed, or it may have a straight shape.

[0054] The right side plate 33 of the lid comprises the right side plate 33F and a connecting piece 323. The left side plate 34 of the lid comprises the left side plate 34F and a connecting piece 324. The right side plate 33F is connected to the lid plate 31 at its short side, which is the intersection line between the lid plate 31 and the right side plate 33F. The left side plate 34F is connected to the lid plate 31 at its short side, which is the intersection line between the lid plate 31 and the left side plate 34F.

[0055] In the right side plate 33 and the left side plate 34 of the lid, each side plate 33F, 34F constitutes the outer surface of the lid 30. Each connecting piece 323, 324 constitutes the inner surface of the lid 30. When the lid 30 is closed and the opening 20T is blocked, the right side plate 33 and the left side plate 34 cover the upper outer surface of the right side plate 23 and the left side plate 24, respectively.

[0056] The connecting piece 323 is positioned with a gap between the short side, which is the intersection line between the lid plate 31 and the right side plate 33F of the lid. The connecting piece 324 is also positioned with a gap between the short side, which is the intersection line between the lid plate 31 and the left side plate 34F of the lid. As a result, the connecting pieces 323 and 324 are positioned with a gap between them and the lid plate 31, forming stepped portions 33S and 34S on the inner surfaces of the right side plate 33 and the left side plate 34 of the lid. When the lid 30 closes the opening 20T, the respective lid locking pieces 3T and 4T fit into the stepped portions 33S and 34S, generating a clicking sound and engaging with the stepped portions 33S and 34S. Through their engagement with the stepped portions 33S and 34S, the respective lid locking pieces 3T and 4T prevent the lid plate 31 from lifting up when closed.

[0057] The adhesive portion 21C that bonds the opening piece 32K and the front plate 21 may have the following first adhesive portion 21C1.

[0058] [First adhesive part 21C1] The first adhesive portion 21C1 satisfies the following conditions 1 to 3. (Condition 1) The first adhesive portion 21C1 is divided into three equal regions based on the maximum length (A) in the longitudinal direction DL, which is parallel to the lower edge 21U of the front plate 21. These regions are divided into the first region A1, the second region A2, and the third region A3 in the longitudinal direction DL, and the maximum length (B) of the second region A2 perpendicular to the longitudinal direction DL is longer than the maximum length of the first region A1 and the third region A3 perpendicular to the longitudinal direction DL.

[0059] (Condition 2) The first adhesive portion 21C1 has a maximum length (A) and a maximum length (B) that satisfy the following conditions. Maximum length (A) > Maximum length (B) (Condition 3) In the first region A1 and third region A3 of the first adhesive portion 21C1, the outer circumference of the first adhesive portion 21C1 includes a curve including the end in the opening direction, and when the radius of curvature at the end of the curve is R and the diameter (mm) of the circle having the radius of curvature R is 2R, the maximum length (B) in the second region A2 is 1.5 times or more the diameter 2R.

[0060] An example of the first adhesive portion 21C1 will be described below with reference to Figure 4. Figure 4 is a view of the first adhesive portion 21C1 from the front side of the front plate 21. As shown in Figure 4, the first adhesive portion 21C1 is divided into three regions in the longitudinal direction DL: a first region A1, a second region A2, and a third region A3. Regions A1, A2, and A3 are three regions that divide the maximum length (A) of the first adhesive portion 21C1 in the longitudinal direction DL into three equal parts. The first region A1 is the region in the first adhesive portion 21C1 where peeling begins first when the opening piece 32K is cut in the opening direction. The third region A3 is the region in the first adhesive portion 21C1 where peeling begins last when the opening piece 32K is cut from the first region A1 in the opening direction. The second region A2 is located between the first region A1 and the third region A3 in the longitudinal direction DL.

[0061] The opening direction from the right end to the left end of the cut line 32M is the first opening direction DA1. The opening direction from the left end to the right end of the cut line 32M is the second opening direction DA2. When the opening piece 32K is opened from the first opening direction DA1, the area on the right side of the first adhesive portion 21C1 is the first region A1, and the area on the left side is the third region A3. Conversely, when the opening piece 32K is opened from the second opening direction DA2, the area on the left side of the first adhesive portion 21C1 is the first region A1, and the area on the right side is the third region A3. Regardless of whether the opening is done from opening direction DA1 or DA2, the area where peeling begins first is the first region A1.

[0062] The first adhesive portion 21C1 has a maximum length in the height direction DH in the second region A2. Here, the height direction DH is perpendicular to the longitudinal direction DL. The maximum value is the maximum length (B) in the height direction DH in the second region A2. The maximum length (B) is greater than the maximum length in the height direction DH in the first region A1 and the maximum length in the height direction DH in the third region A3. In the example shown in Figure 4, the length in the height direction DH of the first adhesive portion 21C1 decreases monotonically from the second region A2 to the first region A1, and also decreases monotonically from the second region A2 to the third region A3.

[0063] The first adhesive portion 21C1 has a shape that tapers from the portion with the maximum length (B) in the second region A2 towards the right end AR. The first adhesive portion 21C1 has a shape that tapers from the portion with the maximum length (B) in the second region A2 towards the left end AL.

[0064] Therefore, the first region A1 has its maximum length in the height direction DH at the boundary with the second region A2, and the third region A3 has its maximum length in the height direction DH at the boundary with the second region A2. In other words, the length of the first region A1 in the height direction DH is less than or equal to the length at the boundary with the second region A2, and the length of the third region A3 in the height direction DH is less than or equal to the length at the boundary with the second region A2.

[0065] Thus, in the longitudinal direction DL, regions A1 and A3, which enclose the second region A2, do not contain any portion in the height direction DH that is longer than the second region A2. Therefore, in the first adhesive portion 21C1, the adhesive area in the second region A2 is the largest among the three regions A1, A2, and A3. Since the adhesive force per unit area is equal in each of the three regions A1, A2, and A3, the adhesive force in the second region A2 is the greatest among the three regions A1, A2, and A3.

[0066] In the first adhesive portion 21C1, the maximum length (A) in the longitudinal direction DL, which is parallel to the lower edge 21U of the front plate 21, is greater than the maximum length (B) in the direction perpendicular to the longitudinal direction DL. Therefore, the shape of the first adhesive portion 21C1 extends in the longitudinal direction DL. This ensures that the adhesive area of ​​the first adhesive portion 21C1 is maintained while reducing the adhesive area of ​​the first region A1 and the third region A3 of the first adhesive portion 21C1 in the longitudinal direction DL.

[0067] The first adhesive portion 21C1 has a right end AR and a left end AL in the longitudinal direction DL. The right end AR and the left end AL are the ends in the opening directions DA1 and DA2. The right end AR of the first adhesive portion 21C1 is the point that is first peeled off when the opening piece 32K is opened from the first opening direction DA1, and is the point that is furthest towards the opening direction DA1 within the first adhesive portion 21C1. The left end AL of the first adhesive portion 21C1 is the point that is first peeled off when the opening piece 32K is opened from the second opening direction DA2, and is the point that is furthest towards the opening direction DA2 within the first adhesive portion 21C1.

[0068] The outer circumference of the first adhesive portion 21C1 includes a curve that includes the right end AR and a curve that includes the left end AL. Therefore, in the example shown in Figure 4, regardless of the opening direction DA1 or DA2, the outer circumference of the first adhesive portion 21C1 includes curves that include the ends in the opening directions DA1 and DA2 in both the first region A1 and the third region A3.

[0069] For curves containing the rightmost point AR, the radius of curvature at the rightmost point AR is RR. For curves containing the leftmost point AL, the radius of curvature at the leftmost point AL is RL. The radius of curvature R of the curve at the end is defined as the radius of curvature R based on the rightmost point AR in the first region A1 and on the leftmost point AL in the third region A3. The maximum length (B) in the second region A2 is at least 1.5 times the diameter 2RR of a circle with radius of curvature RR, and at least 1.5 times the diameter 2RL of a circle with radius of curvature RL. Therefore, regardless of the opening direction DA1 or DA2, the maximum length (B) of the first adhesive portion 21C1 in the second region A2 is at least 1.5 times the diameter of the circle set in the first region A1, and at least 1.5 times the diameter of the circle set in the third region A3.

[0070] Thus, in the first adhesive portion 21C1, the second region A2 has its maximum length in the direction perpendicular to the longitudinal direction DL. Therefore, the adhesive area of ​​the first region A1 and the third region A3 is smaller than the adhesive area of ​​the second region A2. As a result, the adhesive force in the first region A1 and the third region A3 is smaller than the adhesive force in the second region A2, making it easier to peel the opening piece 32K from the container body 20 regardless of the direction from which it is cut. Furthermore, because the opening piece 32K is easier to peel off, the occurrence of adhesive residue on the container body 20 side at the first adhesive portion 21C1 formed on the container body 20 when the opening piece 32K is peeled off is suppressed, and consequently, the tearing of the backing paper of the opening piece 32K, i.e., the paper on the side that adheres to the container body 20, and the adhesion of the backing paper to the container body 20 side can be suppressed. As a result, the appearance of the container body 20 can be improved.

[0071] As described above, a varnish layer formed from OP varnish is located on the front plate 21, excluding the adhesive portion 21C. The adhesive portion 21C is not coated with OP varnish. Since OP varnish is a release-type varnish, the peel strength between the adhesive applied to the back surface of the opening piece 32K and the OP varnish layer is smaller than the peel strength between the back surface of the opening piece 32K and the adhesive at the adhesive portion 21C. On the other hand, the surface of the front plate 21 is made of the surface layer of cardboard, while the back surface of the opening piece 32K is the back surface of cardboard. As a result, the peel strength between the adhesive portion 21C, which is made of a part of the adhesive, and the surface layer of the front plate 21 is smaller than the peel strength between the back surface of the opening piece 32K and the adhesive.

[0072] With the first adhesive portion 21C1 provided in the winding body storage box 10 of this disclosure, because the adhesive area of ​​the first region A1 is small, the peel strength between the surface layer of the front plate 21 and the first adhesive portion 21C1 is smallest at the start of peeling at the first adhesive portion 21C1. As a result, the first adhesive portion 21C1 peels off at the surface layer of the front plate 21, and the first adhesive portion 21C1 is removed from the surface layer of the front plate 21 together with the opening piece 32K. In contrast, if the adhesive area of ​​the first region A1 is large, the peel strength between the surface layer of the front plate 21 and the first adhesive portion 21C1 increases in proportion to the adhesive area, and as a result, a larger force is required at the start of peeling at the first adhesive portion 21C1. As a result, if the force required for delamination of the cardboard constituting the opening piece 32K is less than the force required for delamination between the surface layer of the front plate 21 and the first adhesive portion 21C1, delamination will occur on the back side of the opening piece 32K when the first adhesive portion 21C1 is peeled off. Consequently, the back side of the opening piece 32K will tear, leaving the first adhesive portion 21C1 on the front plate 21, and a portion of the opening piece 32K attached to the first adhesive portion 21C1 will also remain on the front plate 21.

[0073] Furthermore, in the first adhesive portion 21C1, the maximum length (A) in the longitudinal direction DL is longer than the maximum length (B) in the vertical direction in the second region A2. Thus, because the length in the longitudinal direction DL is long in the first adhesive portion 21C1, the total adhesive area of ​​the first adhesive portion 21C1 is increased while reducing the adhesive area of ​​the first region A1 and the third region A3. As a result, sufficient adhesive strength can be maintained by the first adhesive portion 21C1, and consequently, unintended opening of the opening piece 32K can be suppressed.

[0074] When the opening piece 32K is opened, external forces in the opening directions DA1 and DA2 act on each adhesive portion 21C aligned in the opening directions DA1 and DA2. Therefore, from the viewpoint of preventing unintended opening of the opening piece 32K, it is preferable that the adhesive portion 21C has sufficient length in the longitudinal direction DL and sufficient adhesive area. In this regard, as described above, in the first adhesive portion 21C1, the maximum length (A) in the longitudinal direction DL is greater than the maximum length (B) perpendicular to the longitudinal direction DL, so the adhesive area of ​​the first adhesive portion 21C1 in the longitudinal direction DL is secured. This makes it possible to prevent unintended opening of the opening piece 32K.

[0075] Furthermore, since the maximum vertical length (B) of the second region A2 is 1.5 times or more the diameter 2R of a circle with radius of curvature R, the bonding area in the first region A1 and the third region A3 is smaller than the bonding area in the second region A2. The bonding areas in the first region A1 and the third region A3 are 40% to 70% of the bonding area in the second region A2, respectively. By setting it within this range, the bonding area in the terminal region AA including the right end AR and the terminal region BA including the left end AL, as described below, can be set small while ensuring the necessary bonding area. The bonding area in the first region A1 and the third region A3 is more preferably 42% to 60%, and even more preferably 45% to 55%. By setting it within this range, in addition to the above effects, the material of the packaging container can be made of cardboard (especially paper with a basis weight of 350 g / m²). 2 More than 550g / m 2When using coated cardboard (as described below), a good balance can be maintained between stable adhesion and ease of peeling from end regions AA and BA.

[0076] Furthermore, in the first region A1 and the third region A3, when imaginary lines extending perpendicular to the longitudinal direction DL are set to divide the longitudinal direction DL of the first region A1 and the third region A3 into three equal parts based on the maximum length DL, the imaginary lines on the right end AR side and the left end AL side are designated as X. In addition, the region of the first adhesive portion 21C1 located to the right end AR side of imaginary line X in the first region A1 is designated as end region AA, and the region of the first adhesive portion 21C1 located to the left end AL side of imaginary line X in the third region A3 is designated as end region BA. In the first region A1 and the third region A3, the length between the two points where imaginary line X touches the outer circumference of the first adhesive portion 21C1 is between 25% and 65% of the maximum length (B) of the second region A2. By setting the range in this way, the adhesive area in end region AA including the right end AR and end region BA including the left end AL can be set small while securing the necessary adhesive area. As a result, the end regions of the first adhesive portion 21C1, including the right end AR and the left end AL which are the ends in the opening directions DA1 and DA2, are more easily peeled off than other parts of the first adhesive portion 21C1. A more preferred range for the length of the imaginary line X is 30% to 60% of the maximum length (B) of the second region A2, and even more preferably 35% to 55%. By setting the range in this way, in addition to the above effect, the material of the packaging container should be cardboard (especially with a basis weight of 350 g / m²). 2 More than 550g / m 2 When using coated cardboard (as described below), a good balance can be maintained between stable adhesion and ease of peeling from end regions AA and BA.

[0077] In other words, in the first adhesive portion 21C1, the value obtained by multiplying the diameter 2R by 1.5 in the curve including the right end AR and the curve including the left end AL is smaller than the maximum length (B) in the second region A2. Therefore, when comparing the adhesive area in each region of the first adhesive portion 21C1, the adhesive area of ​​the first region A1 including the right end AR and the adhesive area of ​​the third region A3 including the left end AL are smaller than the adhesive area of ​​the second region A2, which is the part with the maximum length (B). As a result, the right end AR and the left end AL, which are the ends of the first adhesive portion 21C1 in the opening directions DA1 and DA2, are more easily peeled off within the first adhesive portion 21C1. This makes it easier to peel the opening piece 32K from the container body 20 regardless of the direction from which the opening piece 32K is cut. Furthermore, since the opening piece 32K is easier to peel off, the occurrence of adhesive residue on the container body 20 side at the first adhesive portion 21C1 formed on the container body 20 when the opening piece 32K is peeled off is suppressed, and consequently, the backing paper of the opening piece 32K, i.e., the paper on the side that adheres to the container body 20, is not torn and does not adhere to the container body 20 side. As a result, the appearance of the container body 20 can be improved. Moreover, in the first region A1 and the third region A3, by setting the length of the imaginary line X to 25% to 65% of the maximum length (B) of the second region A2, the adhesive area in the terminal region AA including the right end AR and the terminal region BA including the left end AL can be set to be smaller. Therefore, peeling from each terminal region including the right end AR and the left end AL, which are the ends of the opening direction DA1 and DA2, of the first adhesive portion 21C1 becomes even easier.

[0078] Furthermore, because the ends in the opening directions DA1 and DA2 are located on a curve, the necessary adhesive strength is maintained at the ends, and when peeling, the peeling area gradually increases, making it easier to peel off.

[0079] The radii of curvature RR and RL of each curve on the outer circumference of the first adhesive portion 21C1 may be between 0.5 mm and 2.5 mm. A radius of curvature RR and RL of 0.5 mm or more ensures sufficient bonding area in the first region A1 and the third region A3, thereby maintaining adhesive strength in both regions. A radius of curvature RR and RL of 2.5 mm or less prevents the bonding area in the first region A1 and the third region A3 from becoming excessively large. This prevents the force required to peel off the first adhesive portion 21C1 from becoming excessively large, resulting in easier peeling of the first adhesive portion 21C1. The preferred range for the radii of curvature RR and RL is between 0.7 mm and 2.2 mm, and the more preferred range is between 1.0 mm and 2.0 mm. The more preferred range ensures adhesive strength when unused while further improving ease of peeling upon opening. Furthermore, since the first adhesive portion 21C1 is easier to peel off, the occurrence of adhesive residue on the container body 20 side at the first adhesive portion 21C1 formed on the container body 20 when the opening piece 32K is peeled off is suppressed, and consequently, the backing paper of the opening piece 32K, i.e., the paper on the side that adheres to the container body 20, is not torn and does not stick to the container body 20 side. As a result, the appearance of the container body 20 can be improved.

[0080] The maximum length (A) of the first adhesive portion 21C1 may be 4 mm or more and 25 mm or less. A maximum length (A) of 4 mm or more makes it possible to increase the reliability of preventing unintended opening of the opening piece 32K. A maximum length (A) of 25 mm or less prevents the total adhesive area of ​​the first adhesive portion 21C1 from becoming excessively large, thereby preventing the adhesive strength of the first adhesive portion 21C1 from becoming excessively large. Preferably, the maximum length (A) of the first adhesive portion 21C1 is 5 mm or more and 20 mm or less, more preferably 7 mm or more and 15 mm or less. By setting it to a more preferable range, it is possible to further improve the ease of peeling when opened while ensuring adhesive strength when not in use.

[0081] The first adhesive portion 21C1 is provided only at both ends of the container body 20 in the longitudinal direction DL. Here, "both ends" refers to the portion of the adhesive portion 21C formed on the front plate 21 that is closest to the right side plate 23 and the left side plate 24 in the longitudinal direction DL of the container body 20. Therefore, regardless of whether the container is opened from the left or the right, the first adhesive portion 21C1 that satisfies conditions 1 to 3 is located at the ends of the opening directions DA1 and DA2 where the opening piece 32K is first peeled off, making it easy to peel off the adhesive portion 21C. In addition, because the first adhesive portion 21C1 that satisfies conditions 1 to 3 is located at the ends of the opening directions DA1 and DA2, the necessary adhesive force is maintained, and unintended opening of the opening piece 32K starting from the ends of the opening directions DA1 and DA2 can be suppressed. Furthermore, it is suppressed that the adhesive force of the opening piece 32K to the container body 20 becomes excessively high.

[0082] When the adhesive portion 21C is formed on the front plate 21, first, overprint (OP) varnish is applied to the entire surface of the front plate 21. At this time, the OP varnish is not applied to the area of ​​the front plate 21 where the adhesive portion 21C is to be placed. The outer shape of the area where the OP varnish is not applied is the same as the shape of the adhesive portion 21C. After that, adhesive is applied to the back surface of the opening piece 32K over its entire width in the opening direction, and the container body 20 and the lid 30, i.e., the opening piece 32K, are bonded together. Since the OP varnish has release properties against adhesive, the adhesive that overlaps the area of ​​the front plate 21 where the OP varnish is applied acts as a pseudo-adhesion. For this reason, the adhesive portion 21C is formed only in the area where the OP varnish is not applied, and the container body 20 and the lid 30 are bonded together at the adhesive portion 21C.

[0083] [Break line 32C] The cut lines will be explained in more detail with reference to Figures 5 to 8. In Figures 5 to 8, for the sake of illustration and explanation, the cut line 32C located on the opening piece 32K and the adhesive portion 21C located on the front plate 21 are shown on the same plane. Figure 5 shows the first adhesive portion 21C1 and the cut line 32C adjacent to the first adhesive portion 21C1. In contrast, Figure 6 shows the second adhesive portion 21C2 and the cut line 32C adjacent to the second adhesive portion 21C2.

[0084] As shown in Figure 5, the opening piece 32K has a cut line 32C. The cut line 32C penetrates the opening piece 32K in the thickness direction. When the opening piece 32K and the front plate 21 are bonded together by the adhesive portion 21C, and the opening piece 32K is viewed from the front, the cut line 32C is located on at least one of the left and right sides of each adhesive portion 21C. In this embodiment, each cut line 32C is located only on the left side of each adhesive portion 21C. However, each cut line 32C may be located only on the right side of each adhesive portion 21C, or on both the right and left sides of each adhesive portion 21C. Furthermore, when we say that the cut line 32C is located on at least one of the left and right sides of each adhesive portion 21C, we mean that in each adhesive portion 21C, a virtual line is set in the vertical direction that bisects the maximum length DL in the longitudinal direction, and when the front plate 21 is viewed from the front, the area to the right of that virtual line is defined as the right side, and the area to the left of that virtual line is defined as the left side. Furthermore, when the cut line 32C is a cut line 32C having a first cut line element 32C1 and a second cut line element 32C2, which are elements of the cut line 32C described below, it means that each of the first cut line element and the second cut line element is located on at least one of the right and left sides of the adhesive portion 21C, with a length of 2 / 3 or more of their respective lengths. In addition, in this embodiment, as shown in Figures 1 and 3, a form in which all cut lines located on the left side of the adhesive portion 21C are cut lines 32C is described, but it is sufficient if 50% or more of all cut lines are cut lines 32C. Note that 50% or more of all cut lines are cut lines 32C means that the number of cut lines formed adjacent to the adhesive portion 21C is counted and the ratio of cut lines 32C to that number is calculated. For example, in Figure 1, 16 cut lines are formed at 8 locations adjacent to the adhesive portion 21C, and all 16 are cut lines 32C, so the ratio of cut lines 32C to all cut lines is 100%.

[0085] An allowable area TA is set on the front plate 21. When setting the allowable area TA, a reference line BL is first set. The reference line BL is a straight line that bisects the maximum height (B) perpendicular to the longitudinal direction DL at the first adhesive portion 21C1 and extends along the longitudinal direction DL. The allowable area TA is the area that is included within 25% of the maximum height (B) on both the opening 20T side and the bottom plate 25 side, with respect to the reference line BL. In other words, the allowable area TA is an area that is within 25% of the maximum height (B) of the first adhesive portion 21C1 on the opening 20T side, and within 25% of the maximum height (B) of the first adhesive portion 21C1 on the bottom plate 25 side, from the set reference line BL. The allowable area TA is a band-shaped area that extends along the longitudinal direction DL. The allowable region TA includes a part of the first adhesive portion 21C1 and extends to both sides of the first adhesive portion 21C1 in the longitudinal direction DL.

[0086] The cut line 32C has a first cut line element 32C1 and a second cut line element 32C2. The first cut line element 32C1 and the second cut line element 32C2 are located to the left of the first adhesive portion 21C1. The first cut line element 32C1 and the second cut line element 32C2 are separated from each other in the height direction DH. The first cut line element 32C1 is located on the bottom plate 25 side of the first adhesive portion 21C1. The bottom plate 25 side of the adhesive portion 21C is the part of the adhesive portion 21C that is located below the reference line BL in the height direction DH. The second cut line element 32C2 is located on the opening 20T side of the first adhesive portion 21C1. The opening 20T side of the first adhesive portion 21C1 is the part of the first adhesive portion 21C1 that is located above the reference line BL in the height direction DH.

[0087] Each cut line element 32C1, 32C2 has an arc shape. Each cut line element 32C1, 32C2 has a curvature such that the center of curvature of each cut line element 32C1, 32C2 is located on the side of the first adhesive portion 21C1 relative to the cut line element 32C1, 32C2, and each cut line element 32C1, 32C2 faces the side of the first adhesive portion 21C1 and is positioned to surround the first adhesive portion 21C1.

[0088] In the first cut line element 32C1, the end on the opening 20T side is the first end C11. The end on the opening 20T side is the end of the two ends of the first cut line element 32C1 that is located above in the height direction DH. In the second cut line element 32C2, the end on the bottom plate 25 side is the second end C22. The end on the bottom plate 25 side is the end of the two ends of the second cut line element 32C2 that is located below in the height direction DH. In this embodiment, the first end C11 and the second end C22 are located within the allowable area TA. Note that it is sufficient if either the first end C11 or the second end C22 is located within the allowable area TA.

[0089] The opening piece 32K has a connecting portion 21E between the first end C11 and the second end C22. The connecting portion 21E is the portion of the opening piece 32K sandwiched between the first end C11 and the second end C22 in the height direction DH, and is a straight portion connecting the first end C11 and the second end C22. Because the connecting portion 21E is formed, the first cut line element 32C1 and the second cut line element 32C2 are not continuous, and the opening piece 32K has a gap between them. In this embodiment, the connecting portion 21E is formed in the height direction DH. The length L21E of the connecting portion 21E is the length between the first end C11 and the second end C22. The length L21E of the connecting portion 21E may be, for example, 0.5 mm or more and 3.0 mm or less. By setting the range in this manner, even if the backing paper of the opening piece 32K delaminates and remains on the container body 20 side when the container is opened from the first adhesive portion 21C1 side to the connecting portion 21E side, the cut line 32C can cut the backing paper of the opening piece 32K, thereby preventing the opening piece 32K from delaminating and the tearing of the backing paper from expanding. The length L21E of the connecting portion 21E is preferably 1.0 mm or more and 2.5 mm or less, more preferably 1.5 mm or more and 2.0 mm or less. By setting the range in this manner, the material of the packaging container can be cardboard (especially paper with a basis weight of 350 g / m²) 2 More than 550g / m 2 The above effect is further enhanced when using coated cardboard (as described below).

[0090] When a virtual line VL is set that is parallel to the front edge 25F of the base plate 25 and passes through the allowable area TA, either the first end C11 or the second end C22 is located on the virtual line VL. The virtual line VL is set within the allowable area TA, passes through the first adhesive portion 21C1 and the connecting portion 21E, and extends in the longitudinal direction DL. In Figure 5, the second end C22 is located on the virtual line VL, but the first end C11 may also be located on the virtual line VL. In the height direction DH, the first end C11 and the second end C22 are located at different positions from each other. Therefore, when a virtual line VL is set in the longitudinal direction DL, the first end C11 and the second end C22 are not located on the same virtual line VL.

[0091] In the longitudinal direction DL, the distance D between the end of the cut line 32C closest to the first adhesive portion 21C1 among the first end C11 and the second end C22, and the first adhesive portion 21C1, may be, for example, 0.5 mm or more and 3.0 mm or less. By setting it within this range, opening from the joint portion 21E towards the first adhesive portion 21C1 is made easy, and even if the backing paper of the opening piece 32K delaminates and remains on the container body 20 side when opening from the first adhesive portion 21C1 towards the joint portion 21E, the cut line 32C can cut the backing paper of the opening piece 32K, thus keeping the area of ​​backing paper remaining on the container body 20 side small. Here, the distance D is as follows. First, a virtual line is set perpendicular to the longitudinal direction DL, using as a reference the point on the side of the first adhesive portion 21C1 adjacent to the cut line 32C that protrudes the most on the cut line 32C side (left side in Figure 5). Distance D is the distance from the first end C11 to the imaginary line, or the distance from the second end C22 to the imaginary line. Distance D is preferably 0.7 mm or more and 2.5 mm or less, more preferably 1.0 mm or more and 2.0 mm or less. By setting it within this range, the material of the packaging container can be cardboard (especially paper with a basis weight of 350 g / m²). 2 More than 550g / m 2 The above effect is further enhanced when using coated cardboard as described below. In the example shown in Figure 5, the distance between the first end C11 and the first adhesive portion 21C1 is equal to the distance between the second end C22 and the first adhesive portion 21C1.

[0092] In the longitudinal direction DL, the lower end portion of the first cut line element 32C1 is located closer to the first end portion C11 than the portion having the maximum length (B) in the first adhesive portion 21C1. In the longitudinal direction DL, the upper end portion of the second cut line element 32C2 is located closer to the second end portion C22 than the portion having the maximum length (B) in the first adhesive portion 21C1.

[0093] As shown in FIG. 6, the cut line 32C adjacent to the second adhesive portion 21C2 also has a first cut line element 32C1 and a second cut line element 32C2, similar to the cut line 32C adjacent to the first adhesive portion 21C1. For the second adhesive portion 21C2 as well, an allowable region TA is set. The allowable region TA is a region included within a range of within 25% of the maximum length LM for each of the opening 20T side and the bottom plate 25 side with reference to the reference line BL.

[0094] In the present embodiment, both the first end portion C11 and the second end portion C22 are located within the allowable region TA. Note that it is sufficient if either one of the first end portion C11 or the second end portion C22 is located within the allowable region TA. In the height direction DH, a connecting portion 21E is located between the first end portion C11 and the second end portion C22. In the height direction DH, the length L21E of the connecting portion 21E may be, for example, 0.5 mm or more and 3.0 mm or less. By setting such a range, even when the backing paper of the unsealing piece 32K peels off between layers and remains on the container body 20 side when unsealing from the first adhesive portion 21C1 side to the connecting portion 21E side, the cut line 32C can cut the backing paper of the unsealing piece 32K, so that it is possible to prevent the backing paper of the unsealing piece 32K from peeling off between layers and the breakage of the backing paper from expanding. The length L21E of the connecting portion 21E is preferably 1.0 mm or more and 2.5 mm or less, more preferably 1.5 mm or more and 2.0 mm or less. By setting such a range, when using cardboard (particularly, coated cardboard with a paper basis weight of 350 g / m 2 or more and 550 g / m 2 or less) as the material of the packaging container, the above effects are further enhanced.

[0095] The distance D between the end of the cut line 32C closest to the second adhesive portion 21C2, among the first end C11 and the second end C22, and the second adhesive portion 21C2, may be, for example, 0.5 mm or more and 3.0 mm or less. In the example shown in Figure 6, the distance D between the first end C11 and the second adhesive portion 21C2 and the distance D between the second end C22 and the second adhesive portion 21C2 are equal. The definition of distance D is the same as above.

[0096] In the longitudinal direction DL, the lower end of the first cut line element 32C1 is located at the same position as the portion having the maximum length LM in the second adhesive portion 21C2. In the longitudinal direction DL, the upper end of the second cut line element 32C2 is located at the same position as the portion having the maximum length LM in the second adhesive portion 21C2.

[0097] The cut line 32C can be modified as follows. Note that in the cut line 32C shown in Figures 7 and 8, the position of the second end C22 of the second cut line element 32C2 relative to the first end C11 of the first cut line element 32C1 is different from that of the cut line 32C shown in Figures 5 and 6. Therefore, only these differences will be explained in detail below.

[0098] As shown in Figure 7, the first cut line element 32C1 and the second cut line element 32C2 have different shapes. In the cut line 32C, the first end C11 and the second end C22 are located on the same virtual line VL. The first end C11 and the second end C22 are positioned at the same location in the height direction DH and are spaced apart in the longitudinal direction DL. Therefore, the first end C11 and the second end C22 are located on the same virtual line VL. In the example shown in Figure 7, the reference line BL is included in the virtual line VL.

[0099] The opening piece 32K has a connecting portion 21E between the first end C11 and the second end C22. The connecting portion 21E is the part of the opening piece 32K sandwiched between the first end C11 and the second end C22 in the longitudinal direction DL. The length L21E of the connecting portion 21E is the length between the first end C11 and the second end C22. The length L21E of the connecting portion 21E may be, for example, 0.5 mm or more and 3.0 mm or less. By setting it within this range, even if the backing paper of the opening piece 32K delaminates and remains on the container body 20 side when opened from the first adhesive portion 21C1 side to the connecting portion 21E side, the cut line 32C can cut the backing paper of the opening piece 32K, thereby preventing the backing paper of the opening piece 32K from delaminating and the tearing of the backing paper from expanding. The length L21E of the connecting portion 21E is preferably 1.0 mm or more and 2.5 mm or less, more preferably 1.5 mm or more and 2.0 mm or less. By setting it within this range, the material of the packaging container can be cardboard (especially paper with a basis weight of 350 g / m²). 2 More than 550g / m 2 The above effect is further enhanced when using coated cardboard (as described below).

[0100] In the longitudinal direction DL, of the first end C11 and the second end C22, the second end C22 is the end of the cut line 32C closest to the first adhesive portion 21C1. The distance D between the second end C22 and the first adhesive portion 21C1 may be, for example, 0.5 mm or more and 3.0 mm or less. The distance between the first end C11 and the first adhesive portion 21C1 is the sum of the distance D and the length L21E. The distance D may be the same size as the length L21E, may be smaller than the length L21E, or may be larger than the length L21E.

[0101] As shown in Figure 8, even at the cut line 32C adjacent to the second adhesive portion 21C2, the first end C11 and the second end C22 are located on the same virtual line VL. The first end C11 and the second end C22 are positioned at the same location in the height direction DH and are spaced apart in the longitudinal direction DL. Therefore, the first end C11 and the second end C22 are located on the same virtual line VL. In the example shown in Figure 8, the reference line BL is included in the virtual line VL.

[0102] The opening piece 32K has a connecting portion 21E between the first end C11 and the second end C22. The connecting portion 21E is the part of the opening piece 32K sandwiched between the first end C11 and the second end C22 in the longitudinal direction DL. The length L21E of the connecting portion 21E is the length between the first end C11 and the second end C22. The length L21E of the connecting portion 21E may be, for example, 0.5 mm or more and 3.0 mm or less. By setting it within this range, even if the backing paper of the opening piece 32K delaminates and remains on the container body 20 side when opened from the first adhesive portion 21C1 side to the connecting portion 21E side, the cut line 32C can cut the backing paper of the opening piece 32K, thereby preventing the backing paper of the opening piece 32K from delaminating and the tearing of the backing paper from expanding. The length L21E of the connecting portion 21E is preferably 1.0 mm or more and 2.5 mm or less, more preferably 1.5 mm or more and 2.0 mm or less. By setting it within this range, the material of the packaging container can be cardboard (especially paper with a basis weight of 350 g / m²). 2 More than 550g / m 2 The above effect is further enhanced when using coated cardboard (as described below).

[0103] In the longitudinal direction DL, of the first end C11 and the second end C22, the second end C22 is the end of the cut line 32C closest to the second adhesive portion 21C2. The distance D between the second end C22 and the second adhesive portion 21C2 may be, for example, 0.5 mm or more and 3.0 mm or less. The distance between the first end C11 and the second adhesive portion 21C2 is the sum of the distance D and the length L21E. The distance D may be the same size as the length L21E, may be smaller than the length L21E, or may be larger than the length L21E.

[0104] [Effect] The function of the winding body housing box 10 will be explained with reference to Figures 9 to 12. Below, the function of the cut line 32C adjacent to the first adhesive portion 21C1 of the adhesive portion 21C will be explained, but the same function can be obtained by the cut line 32C adjacent to the second adhesive portion 21C2.

[0105] As shown in Figure 9, when the opening piece 32K is opened from the first opening direction DA1, the right end AR of the first adhesive portion 21C1 is peeled off first. The right end AR is the point on the first adhesive portion 21C1 that is closest to the opening direction DA1. Since there is no adjacent cut line 32C on the right side of the first adhesive portion 21C1, the force along the first opening direction DA1 acts on the entire first adhesive portion 21C1 in the height direction DH. As a result, the first adhesive portion 21C1 is peeled off from the right end AR towards the left end AL.

[0106] In some cases, the backing paper of the opening piece 32K may delaminate and tear, leaving some of the backing paper on the first adhesive portion 21C1 of the front plate 21. Even in this case, the first cut line element 32C1 and the second cut line element 32C2 formed on the opening piece 32K can prevent the backing paper of the opening piece 32K from tearing further.

[0107] In this case, the length L21E of the connecting portion 21E is 3.0 mm or less, and the distance D between the end of the cut line 32C and the first adhesive portion 21C1 is 3.0 mm or less, thereby suppressing an increase in the amount of interlayer delamination of the backing paper of the opening piece 32K along the first opening direction DA1 when the opening piece 32K is opened from the first opening direction DA1.

[0108] As shown in Figure 10, when the opening piece 32K is opened from the second opening direction DA2, the connecting portion 21E is located in the allowable region TA, so an external force F acts on the left end AL, which is the rear end of the first adhesive portion 21C1 in the opening direction. The end on the front side in the direction of opening is defined as the front end, and the end on the rear side is defined as the rear end. The left end AL is the point in the first adhesive portion 21C1 that is closest to the opening direction DA2. As a result, the peeling of the first adhesive portion 21C1 begins from the rear end of the first adhesive portion 21C1. Therefore, compared to the case where the connecting portion 21E is not located in the allowable region TA, an external force F is more likely to act on the left end AL, making it easier for the first adhesive portion 21C1 and the opening piece 32K to separate. This makes it easier to open the opening piece 32K even when it is opened from the second opening direction DA2. In addition, it is possible to suppress cosmetic defects such as tearing of the opening piece 32K caused by the opening piece 32K being difficult to peel off.

[0109] Furthermore, when the opening piece 32K is opened from the second opening direction DA2, the external force F acts on the portion of the first adhesive portion 21C1 with a smaller adhesive area at the point when peeling of the first adhesive portion 21C1 begins. In this portion, the peel strength between the first adhesive portion 21C1 and the front plate 21 is smaller compared to the portion of the first adhesive portion 21C1 with a longer height direction DH, so peeling is more likely to occur at the boundary between the first adhesive portion 21C1 and the front plate 21. As a result, the first adhesive portion 21C1 is more easily removed from the front plate 21 together with the opening piece 32K.

[0110] In this case, by having a length L21E of the connecting portion 21E of 0.5 mm or more, the certainty that an external force F acts on the first adhesive portion 21C1 when the opening piece 32K is opened from the second opening direction DA2 can be increased. Also, by having a distance D between the end of the cut line 32C and the first adhesive portion 21C1 of 0.5 mm or more, the external force F acting on the opening piece 32K when the opening piece 32K is opened from the second opening direction DA2 can be more easily transmitted to the first adhesive portion 21C1. As a result, delamination at the boundary between the first adhesive portion 21C1 and the front plate 21 becomes more likely, and this makes it less likely that the first adhesive portion 21C1 will remain attached to the front plate 21.

[0111] Furthermore, in the height direction DH, which is perpendicular to the direction in which the imaginary line VL extends, the first end C11 and the second end C22 are positioned at different locations. Therefore, in the second opening direction DA2, the left end AL, which is the rear end of the first adhesive portion 21C1, is located in front of the connecting portion 21E, making it easier for an external force F to act on the rear end of the first adhesive portion 21C1.

[0112] As mentioned above, when the opening piece 32K is opened from the first opening direction DA1, delamination occurs on the opening piece 32K side, rather than on the surface layer of the adhesive portion 21C side of the front plate 21. This can cause the base paper (backing paper) on the back of the opening piece 32K to tear and remain on the adhesive portion 21C. In this case, the cut line 32C adjacent to the adhesive portion 21C cuts the backing paper of the opening piece 32K, thereby preventing the delamination of the opening piece 32K from progressing in the first opening direction DA1.

[0113] When the cut line 32C has the configuration described with reference to Figures 7 and 8, the first end C11 and the second end C22 are located at different positions on the same virtual line VL in the direction in which the virtual line VL extends. Therefore, even if the cutting of the backing paper is insufficient at the end that is close to the first adhesive portion 21C1, the backing paper will be cut at the end that is farther from the first adhesive portion 21C1. This increases the certainty that the delamination of the backing paper of the opening piece 32K will not progress in the first opening direction DA1.

[0114] Furthermore, when the opening piece 32K is opened from the second opening direction DA2, the external force F applied to the opening piece 32K acts on the rear end of the first adhesive portion 21C1 via the connecting portion 21E and the portion located between the second end C22 and the first adhesive portion 21C1. This makes it easier for the first adhesive portion 21C1 to be peeled away from the left end AL towards the right end AR. For this reason, it is even more preferable if the first end C11, the second end C22, and the left end AL are located at different positions on the same virtual line VL in the direction in which the virtual line VL extends, because the external force F applied to the opening piece 32K will act more easily on the left end AL.

[0115] In contrast, as shown in Figure 11, the conventional cut line 132C has an arc shape. The cut line 132C surrounds the first adhesive portion 21C1 on its left side, extending from the top end to the bottom end in the height direction DH of the first adhesive portion 21C1. When the opening piece 32K is opened from the first opening direction DA1, the first adhesive portion 21C1 is peeled off from the right end AR to the left end AL of the first adhesive portion 21C1. Furthermore, even if delamination occurs in the opening piece 32K, the backing paper of the opening piece 32K is cut at the cut line 132C.

[0116] On the other hand, as shown in Figure 12, when the opening piece 32K is opened from the second opening direction DA2, the cut line 132C has a continuous arc shape in the height direction DH. Therefore, when the opening of the opening piece 32K progresses to the cut line 132C, an external force F is concentrated at the upper and lower ends of the cut line 132C. As a result, the opening piece 32K is cut from both the upper and lower ends of the cut line 132C in the second opening direction DA2. Consequently, no external force F acts on the first adhesive portion 21C1, and the opening piece 32K is more likely to be cut upwards or downwards in the height direction towards the adhesive portion 21C, so the opening piece 32K may tear from both ends of the cut line 132C.

[0117] Furthermore, when the opening piece 32K is opened from the second opening direction DA2, the external force F is likely to act near the portion of the first adhesive portion 21C1 that has the greatest height at the time when peeling of the first adhesive portion 21C1 begins. As a result, the peel strength at the boundary between the first adhesive portion 21C1 and the front plate 21 exceeds the peel strength between the layers of the opening piece 32K. Consequently, peeling occurs between the layers of the opening piece 32K, so the first adhesive portion 21C1 remains on the front plate 21, and a portion of the opening piece 32K also remains on the front plate 21 together with the first adhesive portion 21C1.

[0118] As described above, according to one embodiment of the packaging container, the following effects can be obtained. (1) Because the connecting portion 21E is located between the first cut line element 32C1 and the second cut line element 32C2, even when the opening piece 32K is opened from a direction opposite to the direction from the adhesive portion 21C toward the cut line 32C, an external force F acts on the adhesive portion 21C via the connecting portion 21E. Also, if more than 50% of all cut lines having the first cut line element 32C1 and the second cut line element 32C2 are opened, the adhesive portion 21C will peel off from the rear end in the opening direction, making it easier to open the opening piece 32K.

[0119] (2) By having a length L21E of the connecting portion 21E of 0.5 mm or more, the certainty that an external force F acts on the adhesive portion 21C when the opening piece 32K is opened from a direction opposite to the direction from the adhesive portion 21C toward the cut line 32C can be increased.

[0120] (3) By having a joint portion L21E of 3.0 mm or less, even if delamination occurs on the back surface of the opening piece 32K when the opening piece 32K is opened from the direction toward the cut line 32C from the adhesive portion 21C, the backing paper of the opening piece 32K will be cut at the cut line 132C, thereby suppressing deterioration of the appearance.

[0121] (4) In the direction in which the imaginary line VL extends, the first end C11 and the second end C22 are positioned at different locations on the same imaginary line VL. Therefore, when the opening piece 32K is opened from the direction toward the cut line 32C from the adhesive portion 21C, even if the cutting of the backing paper is insufficient at the end that is close to the adhesive portion 21C, the cutting of the backing paper will still occur at the end that is farther from the adhesive portion 21C. This increases the certainty that the delamination of the backing paper of the opening piece 32K will not progress in the opening direction.

[0122] (5) In a direction perpendicular to the direction in which the imaginary line VL extends, the first end C11 and the second end C22 are positioned at different locations from each other. Therefore, when the opening piece 32K is opened from the direction toward the adhesive portion 21C from the cut line 32C, in the opening direction, the rear end of the adhesive portion 21C is located in front of the opening direction of the connecting portion 21E, so an external force F is more likely to act on the rear end of the adhesive portion 21C via the connecting portion 21E.

[0123] (6) The distance between the end of the cut line 32C and the adhesive portion 21C is 0.5 mm or more, so that when the opening piece 32K is opened in the direction from the cut line 32C toward the adhesive portion 21C, the external force F acting on the opening piece 32K is more easily transmitted to the adhesive portion 21C. Therefore, the opening piece 32K becomes easier to open.

[0124] (7) By having a distance of 3.0 mm or less between the end of the cut line 32C and the adhesive portion 21C, when the opening piece 32K is opened in the direction from the adhesive portion 21C toward the cut line 32C, the amount of interlayer delamination of the backing paper of the opening piece 32K along the opening direction is suppressed.

[0125] [Examples] First, we will explain the evaluation methods used in the examples and comparative examples. [Evaluation Method] For each example and each comparative example sample, the opening piece was peeled off, i.e., opened. While holding down the lid piece with a hand, the opening piece was opened from the right and left sides, and the ease of opening was sensory evaluated, and the opened state was confirmed.

[0126] In the test, five monitors were asked to evaluate each example and comparative example. The opening piece was peeled off once from both the left and right sides, and each side was evaluated separately. In the sensory evaluation at the time of opening, for both Evaluation 1 and Evaluation 2 described below, if 3 to 5 people evaluated it as easy to peel off for both right and left opening, it was marked as "○", if 1 to 2 people evaluated it as easy to peel off, it was marked as "△", and if 0 people evaluated it as easy to peel off, it was marked as "×". Furthermore, for the opening state in Evaluation 2, for both right and left opening, if the total number of adhesive residues in the adhesive area after 5 people (i.e., 5 openings) was 5 or less, i.e., the average number of adhesive residues per opening was 1 or less, it was marked as "○", if there were 6 to 15 adhesive residues, i.e., the average number of adhesive residues per opening was more than 1 but 3 or less, it was marked as "△", and if there were 16 or more adhesive residues, i.e., the average number of adhesive residues per opening was more than 3, it was marked as "×". Adhesive residue refers to the adhesive remaining on the adhesive surface of the container body when the opening flap is peeled off. As a result, the backing paper of the opening flap tears and sticks to the container body, degrading its appearance.

[0127] As a condition for opening the opening piece, adhesive sections were formed on the packaging container as follows. The packaging container used had dimensions of 315 mm in the longitudinal direction (DL), 43 mm in the front-to-back direction (DW), and 43 mm in the height direction (DH). The adhesive sections were arranged on the packaging container as shown in Figure 1. Specifically, adhesive sections with the shape shown in Figure 4 were placed at both ends of the front panel of the packaging container in the longitudinal direction (DL), and circular adhesive sections of 4 mm x 4 mm were placed at six locations in the center. For the adhesive sections placed at both ends in the longitudinal direction (DL), the length of A was set to 12 mm, the length of BA was set to 7.5 mm, the radius of curvature R of AL was set to 2.5 mm, and the radius of curvature R of AR was set to 2.5 mm. No cut lines penetrating the front panel or half-cut lines not penetrating the front panel were formed around the periphery of the adhesive sections. In both cases, the adhesive sections were created by providing areas on the front panel where release varnish was not applied. When bonding the adhesive portion to the container body, adhesive (Nichiei Kako Life Bond P8300EM, manufactured by Nichiei Kako Co., Ltd.) was applied to the back of the opening piece using a sack machine, and the adhesive portion on the back of the opening piece was pressed against the front panel with a pressure belt, thereby bonding the opening piece to the front panel. After that, in order to stabilize the adhesion, the bonded cardboard was placed tightly in the box and allowed to solidify under pressure for more than one day.

[0128] Furthermore, a cut line was formed on the opening piece at a position corresponding to the left side of each adhesive portion when the opening piece is viewed from the front. In Evaluation 1, when the opening piece is viewed from the front, the cut lines were numbered sequentially from right to left, with the cut line formed at the far right being designated as 1, the second cut line from the right being designated as 2, and the cut line formed at the far left being designated as 8. Cut lines with the shape shown in Figure 5 or Figure 7 were formed at the positions shown in Table 1, and the ratio of cut lines with the shape shown in Figure 5 or Figure 7 to the total number of cut lines was changed as shown in Table 1. In addition, the length of the joint and the length between the adhesive portion and the end of the cut line element closest to the adhesive portion were set as shown in Table 1. Furthermore, in Comparative Examples 1-1 to 1-3 and Examples 1-1 to 1-4, both the first and second ends were placed within the allowable area. Furthermore, when a cut line having the shape shown in Figure 7 was adopted, the distance between the second end of the second cut line element and the first adhesive portion in the longitudinal direction DL was made shorter than the distance between the first end of the first cut line element and the first adhesive portion. In addition, as a cut line other than those having the shape shown in Figure 5 or Figure 7, a cut line having the shape shown in Figure 11 was adopted.

[0129] Furthermore, in Evaluation 2, cut lines of the same shape were formed at all eight adhesive joints. As shown in Table 2, in each example and each comparative example, one of the cut lines with the shapes shown in Figures 5, 7, and 11 was adopted as the cut line. In addition, in each example and each comparative example, the length of the joint and the length between the adhesive joint and the end of the cut line element closest to the adhesive joint were set to the lengths shown in Table 2. Note that in Comparative Example 2-1 and in Example 2-6 of Examples 2-1 to 2-11, only the first end of the two ends was placed within the allowable area. In contrast, in Comparative Example 2-1 and Examples 2-1 to 2-5 and 2-7 to 2-11, both the first and second ends were placed within the allowable area.

[0130] [Table 1]

[0131] [Table 2]

[0132] [Evaluation Results] As shown in Table 1, more than 50% of all the perforations were the perforations shown in Figure 5 or Figure 7, indicating that the opening piece was easy to open from both the left and the right side. Furthermore, as shown in Table 2, in all of Examples 2-1 to 2-11, the opening piece was easy to open from both the left and the right side, and the appearance after opening was also good.

[0133] The above-described embodiment can be implemented with the following modifications. [Break line] • The cut line 32C adjacent to each adhesive portion 21C may be located to the right of the adhesive portion 21C. In this case, when the opening piece 32K is opened from the first opening direction DA1, an external force F acts on the right end AR, which is the rear end of the adhesive portion 21C, via the connecting portion 21E. This makes it easier to peel the adhesive portion 21C from the right end AR to the left end AL. Also, when the opening piece 32K is opened from the second opening direction DA2, the adhesive portion 21C is peeled off from the left end AL to the right end AR. Furthermore, even if delamination occurs in the opening piece 32K, the backing paper of the opening piece 32K is cut by the cut line 32C.

[0134] The cut lines 32C adjacent to each adhesive portion 21C may be located on both sides of the adhesive portion 21C in the longitudinal direction DL. In this case, when the opening piece 32K is opened from the first opening direction DA1, an external force F acts on the right end AR, which is the rear end of the adhesive portion 21C, via the right-side connecting portion 21E. This makes it easier to peel the adhesive portion 21C from the right end AR towards the left end AL. Furthermore, even if delamination occurs in the opening piece 32K, the backing paper of the opening piece 32K is cut by the left-side cut line 32C.

[0135] When the opening piece 32K is opened from the second opening direction DA2, an external force F acts on the left end AL, which is the rear end of the adhesive portion 21C, via the left connecting portion 21E. This makes it easier to peel the adhesive portion 21C from the left end AL towards the right end AR. Furthermore, even if delamination occurs in the opening piece 32K, the backing paper of the opening piece 32K is cut by the right-side cut line 32C.

[0136] Regarding the cut line 32C shown in Figure 7, in the longitudinal direction DL, the distance between the first end C11 of the first cut line element 32C1 and the first adhesive portion 21C1 may be shorter than the distance between the second end C22 of the second cut line element 32C2 and the first adhesive portion 21C1. Regarding the cut line 32C shown in Figure 8, in the longitudinal direction DL, the distance between the first end C11 of the first cut line element 32C1 and the first adhesive portion 21C1 may be shorter than the distance between the second end C22 of the second cut line element 32C2 and the first adhesive portion 21C1.

[0137] Furthermore, the winding body storage box 10 may also include both a set of cut line 32C and an adhesive portion 21C where the end of the cut line 32C closest to the adhesive portion 21C is the first end C11, and a set of cut line 32C and an adhesive portion 21C where the end of the cut line 32C closest to the adhesive portion 21C is the second end C22.

[0138] The winding container box 10 may include two or more of the following: a set of an adhesive portion 21C and a cut line 32C located to the right of the adhesive portion 21C; a set of an adhesive portion 21C and a cut line 32C located to the left of the adhesive portion 21C; and a set of an adhesive portion 21C and cut lines 32C located on both sides of the adhesive portion 21C.

[0139] The first cut line element 32C1 and the second cut line element 32C2 are not limited to curves. The first cut line element 32C1 and the second cut line element 32C2 may each consist of a straight line, a curve, or a combination of a straight line and a curve.

[0140] According to this cut line 32C, the following effects can be obtained. (8) Since each cut line element 32C1, 32C2 is composed of either a straight line, a curve, or a combination of a straight line and a curve, the degree of freedom in the shape of the cut line 32C can be increased.

[0141] For example, as shown in Figure 13, in one example where the first cut line element 32C1 and the second cut line element 32C2 are both straight lines, the first cut line element 32C1 and the second cut line element 32C2 extend along a direction intersecting the height direction DH so as to surround the adhesive portion 21C on the side where the first cut line element 32C1 and the second cut line element 32C2 are located. The first cut line element 32C1 has an inclination that surrounds the bottom plate 25 side of the first adhesive portion 21C1. The second cut line element 32C2 has an inclination that surrounds the opening 20T side of the first adhesive portion 21C1.

[0142] In Figure 13, the first cut line element 32C1 and the second cut line element 32C2 are symmetrical with respect to the reference line BL as the axis of symmetry. The first cut line element 32C1 and the second cut line element 32C2 have an inclination such that the distance between the cut line elements 32C1 and 32C2 in the height direction DH increases along the direction from the left end AL to the right end AR of the first adhesive portion 21C1.

[0143] The opening piece 32K has a connecting portion 21E between the first end C11 and the second end C22 in the height direction DH. As shown in Figure 14, in one example where the first cut line element 32C1 and the second cut line element 32C2 are folded lines, the cut line elements 32C1 and 32C2 each have an L-shape. Each cut line element 32C1 and 32C2 has a portion extending in the height direction DH and a portion extending in the longitudinal direction DL. The first cut line element 32C1 has a shape that surrounds the bottom plate 25 side of the first adhesive portion 21C1. The second cut line element 32C2 has a shape that surrounds the opening 20T side of the first adhesive portion 21C1. The first cut line element 32C1 and the second cut line element 32C2 are symmetrical with respect to the reference line BL as the axis of symmetry.

[0144] The opening piece 32K has a connecting portion 21E between the first end C11 and the second end C22 in the height direction DH. [Packaging container] The contents of the packaging container are not limited to a rolled body 50R around which the wrap film 50 is wound. The contents of the packaging container may, for example, be a rolled body around which aluminum foil is wound, or a rolled body around which cooking sheets are wound. Alternatively, the contents of the packaging container may be a laminate of multiple folded papers stacked together, or a laminate of multiple folded plastic storage bags stacked together. Alternatively, the contents of the packaging container may be a laminate of multiple drain bags made of nonwoven fabric or synthetic resin stacked together. [Explanation of symbols]

[0145] DH... Height direction DL...longitudinal direction DW…Front and back direction 10...Rotating body containment box 20…Container body 20T…Aperture 21… Front panel 22...Rear plate 25…Bottom plate 25F…Front side 30... Lid 31…Lid plate 32…Lid front plate 32C...cut line 32C1...First cut line element 32C2...Second break element C11...first end C22…Second end BL…Reference line TA... Acceptable range 32P...cover piece 32K…opening piece 35…Cutting blade 50... Wrap film 50R... coiled body

Claims

1. A container body having a front plate, a bottom plate, and a rear plate, with an open top, It has a lid connected to the upper edge of the rear plate, The aforementioned cover is A cover plate that covers the opening, A cover piece connected to the tip of the aforementioned cover plate, The container comprises an opening piece connected to the tip edge of the cover piece via a cut line and adhered to the front plate of the container body, A packaging container in which the lid is opened by cutting off the opening piece in the opening direction, Multiple adhesive portions are provided along the opening direction of the container body for bonding the opening piece and the front plate. When the opening piece is viewed from the front, with the opening piece and the front plate bonded together at the adhesive portion, the opening piece has a cut line located on at least one of the left and right sides of the adhesive portion. Based on a reference line that bisects the maximum height in the longitudinal direction, which is parallel to the front edge of the bottom plate at the adhesive portion, the area of ​​the front plate that is included within 25% of the maximum height on both the opening side and the bottom plate side is defined as the allowable area. More than 50% of all of the aforementioned cut lines have a first cut line element located on the bottom plate side of the adhesive portion and a second cut line element located on the opening side of the adhesive portion. When the end on the opening side of the first cut line element is defined as the first end, and the end on the bottom plate side of the second cut line element is defined as the second end, the first end or the second end is located within the allowable area. A connecting portion is provided between the first end and the second end. packaging container.

2. The length between the first end and the second end is the length of the connecting portion. The length of the connecting portion is 0.5 mm or more and 3.0 mm or less. The packaging container according to claim 1.

3. When a virtual line is set that is parallel to the front edge of the base plate and passes through the allowable area, the first end and the second end are located on the virtual line. The packaging container according to claim 1 or 2.

4. When a virtual line is set that is parallel to the front edge of the bottom plate and passes through the allowable area, the first end or the second end is located on the virtual line. The packaging container according to claim 1 or 2.

5. In the longitudinal direction, the distance between the end of the cut line closest to the adhesive portion among the first and second ends and the adhesive portion is 0.5 mm or more and 3.0 mm or less. The packaging container according to claim 1 or 2.

6. The first cut line element and the second cut line element consist of a combination of straight lines, a combination of curves, or a combination of straight lines and curves. The packaging container according to claim 1 or 2.

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