Packaging containers

Abstract

The present invention provides a packaging container that allows for easy opening of the opening piece in both the direction from one end to the other and the direction from the other end to the first end. [Solution] The first adhesive portion 21C1 satisfies the following conditions. Condition 1. The first adhesive portion 21C1 is divided into a first region A1, a second region A2, and a third region A3, 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. Condition 2. The first adhesive portion 21C1 satisfies A > B. Condition 3. In the first region A1 and the 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 2R or more.

Description

Technical Field

[0001] This disclosure relates to a packaging container.

Background Art

[0002] A packaging container for accommodating a roll-shaped wound body has a container body with an open upper surface and a lid body connected to one apex side of the container body. An example of the wound body is a wrap film. The lid body includes a lid plate covering the opening, a covering piece connected to the tip of the lid plate, and an unsealing piece connected to the covering piece via a cutting line. In a state where the lid body is closed, the covering piece overlaps with the front plate of the container body. The unsealing piece is adhered to the front plate by an adhesive portion disposed on the surface of the front plate. A user of the packaging container can open the packaging container by cutting off the unsealing piece from the cutting line.

[0003] There has been proposed a packaging container that suppresses the generation of adhesive residue and does not damage the appearance of the packaging container when the unsealing piece is peeled off from the front plate. In an example of the packaging container, the adhesive portion has a shape such that the width in the direction perpendicular to the cutting direction of the unsealing piece is maximum at the front end rather than the rear end in the cutting direction (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The adhesive portion described above is configured so that its vertical width is greatest at the front end in the cutting direction. Therefore, when cutting from the rear end towards the front end, the adhesive force of the adhesive portion increases as the cutting progresses, making it easier for the adhesive portion to be pulled apart. On the other hand, when cutting from the front end towards the rear end, the adhesive force is greatest at the part of the adhesive portion that is first pulled apart. Therefore, the adhesive portion is difficult to pull apart. [Means for solving the problem]

[0006] A packaging container for solving the above problems comprises a container body having an open top surface and comprising a front plate, a bottom plate, and a rear plate for containing contents, and a lid connected to the upper edge of the rear plate of the container body. 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 container body. When the opening piece is cut off, the lid rotates around the upper edge as an axis, and the opening is opened and closed by the lid. Multiple adhesive parts are provided along the opening direction for adhering the opening piece to the container body. At least one of the multiple adhesive parts is an adhesive part that satisfies the following conditions 1 to 3.

[0007] Condition 1. The adhesive portion is divided into three equal regions based on the maximum length (A) in the longitudinal direction parallel to the lower edge of the front plate, and is divided into a first region, a second region, and a third region in the longitudinal direction, wherein the maximum length (B) of the second region perpendicular to the longitudinal direction is longer than the maximum length of the first region and the third region perpendicular to the longitudinal direction.

[0008] Condition 2. The adhesive portion satisfies the condition A > B between its maximum length (A) and its maximum length (B). Condition 3. In the first and third regions of the adhesive portion, the outer circumference of the adhesive portion includes a curve that includes 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 is 1.5 times or more the diameter 2R.

[0009] According to the above configuration, in the adhesive portion, the second region has the maximum value in the length perpendicular to the longitudinal direction. Therefore, the adhesive area of ​​the first and third regions is smaller than the adhesive area of ​​the second region. As a result, the adhesive force in the first and third regions is smaller than the adhesive force in the second region, making it easier to peel the opening piece off the container body regardless of the direction from which it is cut. Furthermore, because the opening piece peels off easily, the occurrence of adhesive residue remaining on the adhesive portion of the container body when the opening piece is pulled off is suppressed, and consequently, the tearing of the backing paper of the opening piece and its adherence to the container body can be suppressed. As a result, the appearance of the container body can be improved.

[0010] Furthermore, in the adhesive portion, the maximum length in the longitudinal direction (A) is longer than the maximum length in the vertical direction (B) in the second region. In this way, because the length in the longitudinal direction is long in the adhesive portion, the total adhesive area of ​​the adhesive portion can be increased while gradually decreasing the adhesive area of ​​the first and third regions. This allows sufficient adhesive strength to be maintained by the adhesive portion, and as a result, unintended opening of the opening piece can be suppressed.

[0011] Furthermore, since the maximum vertical length (B) of the second region is 1.5 times or more than 2R, the bonding area in the first and third regions is smaller than the bonding area in the second region. This makes it easier to peel the opening piece from the container body, regardless of the direction from which it is cut. Also, because the opening piece peels off easily, the occurrence of adhesive residue remaining on the bonding part of the container body when the opening piece is pulled off is suppressed, and consequently, the tearing of the backing paper of the opening piece and its adhesion to the container body is suppressed. As a result, the appearance of the container body can be improved.

[0012] In the above-mentioned packaging container, the radius of curvature (R) may be 0.5 mm or more and 2.5 mm or less. According to the above configuration, a radius of curvature (R) of 0.5 mm or more ensures contact area in the first and third regions, thus maintaining adhesive strength in the first and third regions. A radius of curvature (R) of 2.5 mm or less prevents the contact area in the first and third regions from becoming excessively large. This prevents the force required to peel off the adhesive part from becoming excessively large, making it easier to peel off the adhesive part. In addition, the opening piece becomes easier to peel off, which suppresses the occurrence of adhesive residue remaining on the adhesive part of the container body when the opening piece is peeled off, and consequently prevents the backing paper of the opening piece from tearing and sticking to the container body. As a result, the appearance of the container body can be improved.

[0013] In the above-described packaging container, the maximum length (A) of the adhesive portion may be 4 mm or more and 25 mm or less. With the above configuration, having a maximum length (A) of 4 mm or more makes it possible to increase the certainty of preventing unintended opening of the opening piece. Having a maximum length (A) of 25 mm or less prevents the total bonding area of ​​the bonded part from becoming excessively large, thereby preventing the bonding strength of the bonded part from becoming excessively large.

[0014] In the above-described packaging container, when a virtual line X extending perpendicular to the longitudinal direction is set in the first region and the third region to divide the maximum length in the longitudinal direction of the first region and the third region into three equal parts, the length between the two points on the end side of the virtual line X that are in contact with the outer circumference of the adhesive portion may be 25% or more and 65% or less of the maximum length (B).

[0015] According to the above configuration, by setting the length of the imaginary line X to 25% to 65% of the maximum length (B), the shapes of the first and third regions become tapered, and the adhesive area in the region including the end of the adhesive part within the first and third regions can be set to be small. As a result, the opening piece can be easily peeled off the container body regardless of the direction from which it is cut. In addition, because the opening piece is easily peeled off, the occurrence of adhesive residue remaining on the adhesive part of the container body when the opening piece is pulled off is suppressed, and consequently, the tearing of the backing paper of the opening piece and its adhesion to the container body can be suppressed. As a result, the appearance of the container body can be improved.

[0016] In the above-described packaging container, the adhesive portion may be provided only at both ends of the container body in the longitudinal direction. With the above configuration, regardless of whether the container is opened from the left or right, the adhesive portion that satisfies conditions 1 to 3 is located at the longitudinal end where the opening piece is first peeled off, making it easy to peel off the adhesive portion. Furthermore, it prevents unintended opening of the opening piece starting from the end in the opening direction, and prevents the adhesive force of the opening piece to the container body from becoming excessively high.

[0017] In the above-described packaging container, a half-cut line is not required around the adhesive portion of the container body. With the above configuration, since there are no half-cut lines around the adhesive area, the base paper of the front panel is peeled off closer to the surface of the adhesive area, improving the appearance of the adhesive area after opening. A packaging container for solving the above problems comprises a container body having an open top surface and comprising a front plate, a bottom plate, and a rear plate for containing contents, and a lid connected to the upper edge of the rear plate of the container body. 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 container body. When the opening piece is cut off, the lid rotates around the upper edge as an axis, and the opening is opened and closed by the lid. Multiple adhesive parts are provided along the opening direction for adhering the opening piece to the container body, and at least one of the multiple adhesive parts is an adhesive part that satisfies the following conditions 4 to 6.

[0018] Condition 4. The adhesive portion is divided into three equal regions based on the maximum length (A) in the longitudinal direction parallel to the lower edge of the front plate, and is divided into a first region, a second region, and a third region in the longitudinal direction, wherein the maximum length (B) of the second region perpendicular to the longitudinal direction is longer than the maximum length of the first region and the third region perpendicular to the longitudinal direction.

[0019] Condition 5. The adhesive portion satisfies the condition A > B between its maximum length (A) and its maximum length (B). Condition 6. In the first and third regions of the adhesive portion, when a virtual line X extending perpendicular to the longitudinal direction is set to divide the maximum length in the longitudinal direction of the first and third regions into three equal parts, the length between the two points on the end side of the virtual line X in the opening direction that are in contact with the outer circumference of the adhesive portion is 25% or more and 65% or less of the maximum length (B), and the outer circumference of the adhesive portion includes a straight line that includes the end in the opening direction.

[0020] According to the above configuration, in the adhesive portion, the second region has a maximum value in the length in the direction perpendicular to the longitudinal direction. Therefore, the adhesive areas of the first region and the third region are smaller than the adhesive area of the second region. As a result, the adhesive force in the first region and the third region becomes smaller than the adhesive force in the second region, so that the opening piece can be easily peeled off from the container body regardless of the direction from which the opening piece is cut out. In addition, since the opening piece can be easily peeled off, it is possible to suppress the occurrence of glue residue in which the adhesive remains on the adhesive portion of the container body when the opening piece is peeled off, and accordingly, the back paper of the opening piece is torn and the back paper adheres to the container body side, and as a result, the appearance of the container body can be improved.

[0021] Also, in the adhesive portion, the maximum length (A) in the longitudinal direction is longer than the maximum length (B) in the vertical direction in the second region. Thus, since the length in the longitudinal direction is long in the adhesive portion, it is possible to increase the total adhesive area of the adhesive portion while gradually reducing the adhesive areas of the first region and the third region. As a result, sufficient adhesive force by the adhesive portion can be maintained, and as a result, unintentional opening of the opening piece can be suppressed.

[0022] Furthermore, when a virtual line X that trisects the maximum lengths in the longitudinal directions of the first region and the third region is set, the length between two points that contact the outer periphery of the adhesive portion of the virtual line X on the end side is 25% or more and 65% or less of the maximum length (B), and since the outer periphery of the adhesive portion is configured to include a straight line including the end portion in the opening direction, the adhesive areas in the first region and the third region are smaller than the adhesive area in the second region. As a result, the opening piece can be easily peeled off from the container body regardless of the direction from which the opening piece is cut out. In addition, since the opening piece can be easily peeled off, it is possible to suppress the occurrence of glue residue in which the adhesive remains on the adhesive portion of the container body when the opening piece is peeled off, and accordingly, the back paper of the opening piece is torn and the back paper adheres to the container body side, and as a result, the appearance of the container body can be improved.

Advantages of the Invention

[0023] According to the packaging container of this disclosure, the opening tab can be easily opened in both the direction from one end to the other and the direction from the other end to the first end. Furthermore, because the opening tab can be easily opened, it is possible to suppress the adhesion of adhesive residue from the backing paper of the opening tab to the container body, and as a result, the appearance of the container body can be improved. [Brief explanation of the drawing]

[0024] [Figure 1] Figure 1 is a perspective view of the unopened coiled material storage box, 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 a first modified example of the first adhesive joint. [Figure 6] Figure 6 is a plan view showing a second modified example of the first adhesive joint. [Modes for carrying out the invention]

[0025] An embodiment of a packaging container will be described with reference to Figures 1 to 6. 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.

[0026] 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.

[0027] 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.

[0028] [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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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 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 right side plate 23 and left side plate 24 have a rectangular plate shape and face each other in the longitudinal direction DL, with 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, being 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 edge 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 edge of the bottom plate 25.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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. When the adhesive portion 21C is formed on the container body 20, first, a releaseable 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.

[0046] [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.

[0047] 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 a plurality of semicircular notches 32C located below the midpoint of the height direction DH. The notches 32C are positioned adjacent to the adhesive portion 21C provided on the front surface of the front plate 21 when the front lid plate 32 and the front plate 21 are overlapping, and the front lid plate 32 is bonded to the adhesive portion 21C inside the notches 32C.

[0048] 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.

[0049] 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. Adhesive is applied along the longitudinal direction DL to the back surface of the opening piece 32K, i.e., the surface in contact with the container body 20, and the opening piece 32K is bonded to the front surface of the front plate 21 by the adhesive part 21C. The lid 30 is opened by cutting the opening piece 32K in the opening direction from the opening end 32N toward the left end of the cut line 32M. That is, the lid 30 is opened by cutting the opening piece 32K from the right side toward the left side. The lid 30 can also be opened by cutting the opening piece 32K from the left side toward the right side.

[0050] When the opening end 32N is pulled forward, the front lid plate 32 is cut along the cut line 32M. Also, the adhesive on the inside of the cut portion 32C between the front plate 21 and the front lid plate 32 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. The upper section of the front lid plate 32, separated by the cut line 32M, is the cover piece 32P. The lower section of the front lid plate 32, separated 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] [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.

[0061] (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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 with respect to the rightmost point AR, which is the base point on the circumference, in the first region A1, and the radius of curvature R with respect to the leftmost point AL, which is the base point on the circumference, 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 a radius of curvature RR, and at least 1.5 times the diameter 2RL of a circle with a 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] As described above, according to one embodiment of the packaging container, the following effects can be obtained. (1) Since the first adhesive portion 21C1 satisfies condition 1, the adhesive area of ​​the first region A1 and the third region A3 becomes 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 becomes smaller than the adhesive force in the second region A2, so that the opening piece 32K can be easily peeled off from the container body 20 regardless of the direction from which it is cut. In addition, since the opening piece 32K can be easily peeled 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.

[0086] (2) Since the first adhesive portion 21C1 satisfies condition 2, the length of the first adhesive portion 21C1 in the longitudinal direction DL is long. Therefore, the total adhesive area of ​​the first adhesive portion 21C1 is large. As a result, sufficient adhesive strength can be maintained by the first adhesive portion 21C1, and as a result, unintended opening of the opening piece 32K can be suppressed.

[0087] (3) Since the maximum vertical length (B) of the second region A2 is 1.5 times or more than 2RR and 2RL, the bonding area in the first region A1 and the third region A3 is smaller than the bonding area in the second region A2. As a result, the opening piece 32K is easier to peel off from the container body 20, regardless of the direction from which it is cut. Also, because the opening piece 32K is easier to peel off, the occurrence of adhesive residue on the container body 20 side at the first bonding 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 prevented from tearing and sticking to the container body 20 side. As a result, the appearance of the container body can be improved.

[0088] (4) If the radius of curvature (R) of the curve is 0.5 mm or more, the bonding area in the first region A1 and the third region A3 is secured, and the bonding strength in the first region A1 and the third region A3 is maintained.

[0089] (5) When the radius of curvature (R) of the curve is 2.5 mm or less, the bonding area in the first region A1 and the third region A3 is prevented from becoming excessively large. This prevents the force required to peel off the first bonding portion 21C1 from becoming excessively large, and as a result, the peeling off of the first bonding portion 21C1 becomes easier.

[0090] (6) If the maximum length (A) of the adhesive portion 21C is 4 mm or more, it is possible to increase the reliability of preventing unintended opening of the opening piece 32K. (7) When the maximum length (A) of the adhesive portion 21C is 25 mm or less, the total adhesive area of ​​the first adhesive portion 21C1 is prevented from becoming excessively large, thereby preventing the adhesive strength of the first adhesive portion 21C1 from becoming excessively large.

[0091] (8) If the length of the imaginary line X set in the first region A1 and the third region A3 is 25% or more and 65% or less of the maximum length (B) of the second region A2, the adhesive area of ​​the region including the ends of the first region A1 and the third region A3 can be set to be smaller. This makes it easier to peel off the opening piece from the container body, regardless of the direction from which it is cut. Also, 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.

[0092] (9) Regardless of whether the container is opened from the left or the right, if the first adhesive portion 21C1 that satisfies conditions 1 to 3 is located at the end of the longitudinal direction DL from which the opening piece 32K is first peeled off, the peeling off of the adhesive portion 21C that is first peeled off becomes easier, so that the peeling off of the opening piece 32K becomes easier regardless of whether the container is opened from the left or the right. In addition, unintended opening of the opening piece 32K starting from the ends of the opening directions DA1 and DA2 is suppressed, and the adhesive force of the opening piece 32K to the container body 20 is suppressed to be excessively high.

[0093] [Examples] First, we will explain the evaluation methods used in the examples and comparative examples. [Evaluation Method] For each example and comparative example sample, the opening piece was peeled off. While holding down the lid piece with a hand, the opening piece was opened from the right and left sides respectively, and the opening state and sensory evaluation at the time of opening were performed. The evaluation was performed on the adhesive parts located at both ends of the packaging container under the following conditions. The packaging container used had dimensions of DL315mm in the longitudinal direction, DW43mm in the front-to-back direction, and DH43mm in the height direction. The adhesive parts were arranged on the packaging container as shown in Figure 1. Specifically, adhesive parts with the dimensions shown in Table 1 were placed at both ends in the longitudinal direction of the front plate of the packaging container, and 4mm x 4mm circular adhesive parts were placed at 6 locations in the center. This resulted in a total of 8 adhesive parts. The evaluation was performed 3 times on each side for each example and comparative example. Since 2 adhesive parts were evaluated in one evaluation, 12 adhesive parts were evaluated in 3 evaluations on each side.

[0094] For the evaluation of the opening state, when the opening piece was peeled off three times on each side, a total of four or fewer adhesive residues at both ends were set as "○" and five or more were set as "×". In addition, for the sensory evaluation of opening, when the opening piece was peeled off three times on each side, a "○" was set if the adhesive parts at both ends of the packaging container were easy to peel off all three times on both sides, and a "×" was set if the adhesive strength was high and it was difficult to peel off all three times on both sides, or if it was easy to peel off but the adhesive strength was weak, meaning it peeled off immediately without resistance, and there was a possibility of unintended opening.

[0095] As conditions, for each example and comparative example, A: maximum length in the longitudinal direction DL of the adhesive portion, 1B: maximum length perpendicular to the longitudinal direction of the first region, 2B: maximum length perpendicular to the longitudinal direction of the second region, and 3B: maximum length perpendicular to the longitudinal direction of the third region were set as shown in Table 1. In the examples and comparative examples, the rightmost region of the adhesive portion was set as the first region, the central region as the second region, and the leftmost region as the third region. In comparative example 4, the outer diameter of the adhesive portion was set to a rhombus shape.

[0096] Furthermore, no cut lines penetrating the front panel or half-cut lines not penetrating the front panel were formed around the periphery of the adhesive area. The adhesive area was positioned by providing a portion of the front panel where release varnish was not applied. The adhesive area and the container body were bonded by applying adhesive (P8300EM, manufactured by Nichiei Kako Lifebond Co., Ltd.) to the back surface of the opening piece using a sack machine, and then pressing the adhesive portion on the back surface of the opening piece against the front panel with a pressure belt. After that, to stabilize the bond, the bonded cardboard was placed tightly in the box and allowed to solidify under pressure for at least one day. Subsequently, a packaging container with an adhesive area of ​​the dimensions shown in Table 1 was created.

[0097] [Table 1]

[0098] The evaluation results are shown in Tables 2 and 3.

[0099] [Table 2]

[0100] [Table 3]

[0101] The above-described embodiment can be implemented with the following modifications. [1st adhesive part] - Of the multiple adhesive portions 21C, all adhesive portions 21C other than those located at the ends of the longitudinal direction DL may be the first adhesive portion 21C1. In this case, in addition to the first adhesive portion 21C1 located at the ends of the longitudinal direction DL, the adhesive portion 21C sandwiched between the first adhesive portions 21C1 at both ends may also be the first adhesive portion 21C1. Alternatively, in the longitudinal direction DL, the adhesive portions 21C at both ends may be the second adhesive portions 21C2, and one or more adhesive portions 21C sandwiched between the second adhesive portions 21C2 may be the first adhesive portion 21C1.

[0102] The first adhesive portion 21C1 may have multiple curves in the first region A1 and the third region A3, including ends in the opening directions DA1 and DA2. In this case, it is sufficient that the radius of curvature (R) at the end of at least one curve satisfies condition 3.

[0103] As shown in Figure 5, the first adhesive portion 21C1 may have an edge in the opening direction that extends in the height direction DH perpendicular to the longitudinal direction DL. The first adhesive portion 21C1 shown in Figure 5 has a region divided into three equal parts based on the maximum length (A) in the longitudinal direction DL, and has the maximum length (B) in the height direction DH at the center of the longitudinal direction DL, i.e., the second region A2. The first adhesive portion 21C1 has a shape that tapers from the center of the longitudinal direction DL towards the right end of the longitudinal direction DL, and tapers towards the left end of the longitudinal direction DL.

[0104] When the opening direction is the first opening direction DA1, the region containing the rightmost edge RE is the first region A1. Within the first region A1, the rightmost edge RE extending in the height direction DH is the end of the first region A1.

[0105] Furthermore, when the opening direction is the first opening direction DA1, the region containing the left edge LE is the third region A3. Within the third region A3, the left edge LE extending in the height direction DH is the end of the third region A3. The region sandwiched between the first region A1 and the third region A3 is the second region A2.

[0106] The first adhesive portion 21C1 shown in Figure 5 satisfies the following conditions 4 to 6. (Condition 4) 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.

[0107] (Condition 5) The first adhesive portion 21C1 satisfies the condition A > B, where A is the maximum length (A) and B is the maximum length (B). (Condition 6) In the first region A1 and third region A3 of the first adhesive portion 21C1, when a virtual line X is set perpendicular to the longitudinal direction DL that divides the maximum length DL of the first region A1 and third region A3 into three equal parts, the length between the two points on the end side of the virtual line X in the opening direction that are in contact with the outer circumference of the first adhesive portion 21C1 is 25% or more and 65% or less of the maximum length (B), and the outer circumference of the first adhesive portion 21C1 includes a straight line that includes the end in the opening direction.

[0108] The first adhesive portion 21C1 has a pair of right hypotenuses RH extending toward the second region A2 from the upper and lower ends of the right edge RE in the height direction DH in the first region A1. The first adhesive portion 21C1 has a pair of left hypotenuses LH extending toward the second region A2 from the upper and lower ends of the left edge LE in the height direction DH in the third region A3.

[0109] Furthermore, if the opening direction of the opening piece 32K is the second opening direction DA2, then the first region A1 described above becomes the third region A3, and the third region A3 becomes the first region A1. As shown in Figure 5, in the first region A1, the outer circumference of the first adhesive portion 21C1 includes the right end edge RE, which is the end in the opening direction DA1, and a pair of right hypotenuse edges RH extending toward the second region A2 from the upper and lower ends of the right end edge RE in the height direction DH. In the third region A3, the outer circumference of the first adhesive portion 21C1 includes the left end edge LE, which is the end in the opening direction DA2, and a pair of left hypotenuse edges LH extending toward the second region A2 from the upper and lower ends of the left end edge LE in the height direction DH.

[0110] With the configuration including the first adhesive portion 21C1 described above, the same effects as those described in (1) to (3) above can be obtained. Even in this case, regardless of the opening direction DA1 or DA2, the adhesive force in the first region A1 and the third region A3 is smaller than the adhesive force in the second region A2. As a result, the opening piece 32K becomes easier to tear off, regardless of the opening direction DA1 or DA2. Furthermore, because the opening piece 32K becomes easier to tear 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 prevented from tearing and sticking to the container body 20 side. As a result, the appearance of the container body 20 can be improved.

[0111] As shown in Figure 6, the first adhesive portion 21C1 that satisfies conditions 4 to 6 may have a roughly diamond shape. The first adhesive portion 21C1 is divided into a first region A1, a second region A2, and a third region A3 in the longitudinal direction DL. The maximum length (B) in the second region A2 is longer than the maximum length in each of the first region A1 and the second region A2, and the maximum length (A) of the adhesive portion in the longitudinal direction DL is longer than the maximum length (B) in the second region A2. Among the imaginary lines X set in the first region A1 and the second region A2, the distance between two points touching the outer circumference of the first adhesive portion 21C1 in the imaginary line X that is close in distance from the end in the opening direction is 25% or more and 65% or less of the maximum length (B).

[0112] The first adhesive portion 21C1 has an edge at each end in the opening direction that extends in the height direction DH perpendicular to the longitudinal direction DL. The first adhesive portion 21C1 also has a hexagonal shape. In the first adhesive portion 21C1, the length LDL in the longitudinal direction DL is longer than the length LDH in the height direction DH. The first adhesive portion 21C1 has a right end edge RE extending in the height direction DH at its right end and a left end edge LE extending in the height direction DH at its left end. The right end edge RE is the end in the opening direction DA1, and the left end edge LE is the end in the opening direction DA2.

[0113] The length of the rightmost side RE is equal to the length of the leftmost side LE. The length of the diagonal DG extending in the height direction DH is longer than the lengths of both the rightmost side RE and the leftmost side LE. The first adhesive portion 21C1 is symmetrical with respect to the diagonal DG as the axis of symmetry, with respect to the portion containing the rightmost side RE and the portion containing the leftmost side LE being symmetrical with respect to each other. The portion containing the rightmost side RE and the portion containing the leftmost side LE each have a trapezoidal shape.

[0114] In the first adhesive portion 21C1, the adhesive area near the right edge RE and the adhesive area near the left edge LE are smaller than the adhesive area in the portion including the diagonal DG. Therefore, regardless of whether the opening piece 32K is opened from the opening direction DA1 or DA2, the adhesive force at the edges RE and LE that are first peeled off in the first adhesive portion 21C1 can be made smaller than the adhesive force in the portion including the diagonal DG. This makes it easier to open the opening piece 32K regardless of the opening direction DA1 or DA2.

[0115] On the other hand, compared to the case where the first adhesive portion 21C1 has a rhombic shape in which the length LDL in the longitudinal direction DL and the length of the diagonal DG are the same, it is possible to increase the adhesive area near the right end RE and the adhesive area near the left end LE. As a result, the adhesive strength at each end RE and LE is increased, making it possible to suppress unintended opening of the opening piece 32K.

[0116] The configuration comprising the first adhesive portion 21C1 described above can be obtained to achieve the following effects. (10) Compared to the case where the first adhesive portion 21C1 has a rhombus shape in which the length LDL in the longitudinal direction DL and the maximum length in the height direction DH are the same, it is possible to increase the adhesive area of ​​the first adhesive portion 21C1. In addition, since the adhesive area at both ends of the longitudinal direction DL is smaller than the adhesive area at the center of the longitudinal direction DL, the first adhesive portion 21C1 is easier to peel off when opening the opening piece 32K from any direction. Furthermore, because 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 adhere to the container body 20 side. As a result, the appearance of the container body 20 can be improved.

[0117] [Container body] The front plate 21 may have a half-cut line located around the adhesive portion 21C. Even in this case, it is possible to obtain the effects of the shape of the first adhesive portion 21C1.

[0118] [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]

[0119] DH... Height direction DL...longitudinal direction DW…Front and back direction 10...Rotating body containment box 20…Container body 20T…Aperture 21… Front panel 21U…Bottom edge of the front panel 21C…Adhesive part 21C1…1st adhesive part 21C2…Second adhesive part 22...Rear plate 25…Bottom plate 30... Lid 31…Lid plate 32…Lid front plate 32P...cover piece 32K…opening piece 35…Cutting blade 50... Wrap film 50R... coiled body

Claims

1. The container body has an open top and is equipped with a front plate, a bottom plate, and a rear plate, and contains the contents. The container body 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 aforementioned cover piece via a perforated line and adhering to the container body, A packaging container in which the opening is opened and closed by the lid, after the opening piece is cut off, the lid rotates on its upper edge as an axis, Multiple adhesive portions are provided along the opening direction to bond the opening piece and the container body. At least one of the multiple adhesive portions is an adhesive portion that satisfies the following conditions 1 to 3. packaging container. Condition 1. The adhesive portion is divided into three equal regions based on the maximum length (A) in the longitudinal direction parallel to the lower edge of the front plate, and is divided into a first region, a second region, and a third region in the longitudinal direction, wherein the maximum length (B) of the second region perpendicular to the longitudinal direction is longer than the maximum length of the first region and the third region perpendicular to the longitudinal direction. Condition 2. The adhesive portion satisfies the condition A > B between its maximum length (A) and its maximum length (B). Condition 3. In the first and third regions of the adhesive portion, the outer circumference of the adhesive portion includes a curve that includes 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 is 1.5 times or more the diameter 2R.

2. The radius of curvature (R) is 0.5 mm or more and 2.5 mm or less. The packaging container according to claim 1.

3. The maximum length (A) of the adhesive portion is 4 mm or more and 25 mm or less. The packaging container according to claim 1 or 2.

4. In the first and third regions, when a virtual line X extending perpendicular to the longitudinal direction is set to divide the maximum length in the longitudinal direction of the first and third regions into three equal parts, the length between the two points on the end side of the virtual line X that are in contact with the outer circumference of the adhesive portion is 25% or more and 65% or less of the maximum length (B). The packaging container according to claim 1 or 2.

5. The adhesive portion is provided only at both ends in the longitudinal direction of the container body. The packaging container according to claim 1 or 2.

6. There are no half-cut lines around the adhesive portion of the container body. The packaging container according to claim 1 or 2.

7. The container body has an open top and is equipped with a front plate, a bottom plate, and a rear plate, and contains the contents. The container body 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 aforementioned cover piece via a perforated line and adhering to the container body, A packaging container in which the opening is opened and closed by the lid, after the opening piece is cut off, the lid rotates on its upper edge as an axis, Multiple adhesive portions are provided along the opening direction to bond the opening piece and the container body. At least one of the multiple adhesive portions is an adhesive portion that satisfies the following conditions 4 to 6. packaging container. Condition 4. The adhesive portion is divided into three equal regions based on the maximum length (A) in the longitudinal direction parallel to the lower edge of the front plate, and is divided into a first region, a second region, and a third region in the longitudinal direction, wherein the maximum length (B) of the second region perpendicular to the longitudinal direction is longer than the maximum length of the first region and the third region perpendicular to the longitudinal direction. Condition 5. The adhesive portion satisfies the condition A > B between the maximum length (A) and the maximum length (B). Condition 6. In the first and third regions of the adhesive portion, when a virtual line X extending perpendicular to the longitudinal direction is set to divide the maximum length in the longitudinal direction of the first and third regions into three equal parts, the length between the two points on the end side of the virtual line X that touch the outer circumference of the adhesive portion in the opening direction is 25% or more and 65% or less of the maximum length (B), and the outer circumference of the adhesive portion includes a straight line that includes the end in the opening direction.

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