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 lid comprises a lid plate that covers the opening, a covering piece 32P connected to the tip of the lid plate, and an opening piece 32K connected to the tip edge of the covering piece 32P via a cut line 32M. The lid of the packaging container is opened by cutting the opening piece 32K from one end to the other. The cut line 32M comprises a plurality of cuts 32R arranged at intervals along the longitudinal direction DL of the packaging container. Each cut 32R has a first cut element 32R1 extending along the tip edge and at least one second cut element 32R2 extending in a direction intersecting the first cut element 32R1. The first cut element 32R1 is positioned to protrude from all of the second cut elements 32R2.

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] In the first example of the packaging container, an opening tab is connected to the lower edge of the front plate of the lid via intermittent perforations. The perforations consist of multiple T-shaped cuts (see, for example, Patent Document 1). In the second example of the packaging container, an opening tab is connected to the lid piece via a perforation line. The perforation line consists of multiple J-shaped cuts, which are arranged in series with vertical spacing between them (see, for example, Patent Document 2). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2003-291960 [Patent Document 2] Japanese Patent Application Publication No. 6-183437 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Each of the aforementioned cuts comprises a first cut element extending in the direction in which the cuts are aligned, and a second cut element perpendicular to the first cut element. The second cut element is located at one end of the first cut element. Both the cut line and the cutting line have a shape that facilitates cutting in the direction from the other end of the first cut element in the first cut towards the second cut element in the second cut, among adjacent cuts. In other words, the cut has a shape that facilitates cutting along the cut line or cutting line for cutting off the opening piece from one end to the other.

[0006] However, if the cut line or perforation is cut from one end to the other, the second cut element is more likely to be cut from the upper and lower ends in the direction in which it extends, making it difficult to cut off the opening piece.

[0007] Therefore, users of packaging containers may not always be able to open them from the direction that makes it easiest to tear off the opening tab. In particular, if the user is visually impaired, even if the packaging container has markings indicating the direction to open the opening tab, they may open the tab from one end to the other, making it difficult to open. [Means for solving the problem]

[0008] A packaging container for solving the above problems comprises a container body with an open top 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 perforation line. The packaging container opens and closes the opening by the lid rotating around the upper edge as the opening piece is cut from one end to the other. The perforation line comprises a plurality of cuts arranged at intervals in the longitudinal direction of the packaging container. In at least one of the plurality of cuts, the cut has a first cut element extending along the tip edge and at least one second cut element extending in a direction intersecting the first cut element. The first cut element is positioned to protrude from all of the second cut elements.

[0009] According to the above configuration, since the first cut element protrudes from the second cut element in the direction along the tip edge, regardless of whether the opening piece is opened from one end or the other, the tears originating from the first cut elements tend to connect between adjacent first cut elements in the direction along the tip edge. Therefore, it is possible to easily open the opening piece in both the direction from one end to the other and the direction from the other end to the first end.

[0010] In the above-described packaging container, at least one of the second cut elements may intersect the first cut element at a position 0.1 mm to 2.0 mm away from at least one end of the first cut element.

[0011] According to the above configuration, since the length of the first cut element protruding from the second cut element is 0.1 mm or more, it is possible to increase the certainty that a tear originating from the first cut element will connect between adjacent first cut elements in the direction along the tip edge. Since the length of the first cut element protruding from the second cut element is 2.0 mm or less, when the cut line is torn from the end of the first cut element toward the second cut element, the tear generated at the end of the first cut element is more likely to reach the second cut element.

[0012] In the above-described packaging container, the cut may further include a third cut element that is inclined toward the lid side from at least one end of the first cut element.

[0013] With the above configuration, the third cut element is inclined toward the cover piece, so that after the opening piece is opened along the cut line, a portion of the tip edge of the cover piece is less likely to protrude toward the bottom plate side relative to the cut line before opening.

[0014] In the above-described packaging container, the distance between adjacent cuts in the direction along the leading edge may be 0.5 mm or more and 3.0 mm or less.

[0015] According to the above configuration, while preventing unintentional cutting between two adjacent cuts along the tip edge, a tear occurring at the end of one of the adjacent cuts can easily reach the end of the other cut, making it easier to cut the opening piece.

[0016] In the above-described packaging container, the length of the first cut element in the direction along the leading edge may be 10 mm or more and 50 mm or less.

[0017] According to the above configuration, while maintaining sufficient strength to prevent unintended damage when not in use, a tear is reliably created along the perforation line, thereby ensuring that the opening piece is securely separated from the cover piece.

[0018] In the above-described packaging container, the length of the second cut element in the intersecting direction may be 1.0 mm or more and 6.0 mm or less. According to the above configuration, when the cut line is torn from the end of the first cut element toward the second cut element, the tear that occurs at the end of the first cut element is more likely to reach the second cut element.

[0019] In the above-described packaging container, the length of the third cut element may be 0.5 mm or more and 5.0 mm or less.

[0020] According to the above configuration, the certainty that the direction in which the cut line is cut is induced by the third notch element can be enhanced.

[0021] In the above packaging container, the cut line may be such that the notch having the first notch element and the second notch element is 50% or more of all the notches.

[0022] According to the above configuration, since 50% or more of all the notches constituting the cut line include the first notch element and the second notch element, it is possible to easily open the opening piece in both the direction from one end to the other end and the direction from the other end to one end of the opening piece.

Advantages of the Invention

[0023] According to the packaging container of the present disclosure, it is possible to easily open the opening piece in both the direction from one end to the other end and the direction from the other end to one end of the opening piece.

Brief Description of the Drawings

[0024] [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] FIG. 2 is a perspective view of the wound body storage box after opening as seen from the upper right front. [Figure 3] FIG. 3 is a plan view showing an intermediate body for manufacturing the wound body storage box. [Figure 4] FIG. 4 is a plan view showing the structure of the notch provided in the cut line of the wound body storage box before opening. [Figure 5] FIG. 5 is a plan view for explaining the cutting manner of the cut line when the opening piece of the present disclosure is opened from the right end to the left end. [Figure 6] FIG. 6 is a plan view for explaining the cutting manner of the cut line when the opening piece of the present disclosure is opened from the left end to the right end. [Figure 7]Figure 7 is a plan view illustrating how the perforations are cut when the opening piece of this disclosure is opened from right to left. [Figure 8] Figure 8 is a plan view illustrating how the cut line breaks when the opening piece of this disclosure is opened from left end to right end. [Figure 9] Figure 9 is a plan view illustrating how the perforations break when a conventional opening tab is opened from right to left. [Figure 10] Figure 10 is a plan view illustrating how the perforations break when a conventional opening tab is opened from left to right. [Figure 11] Figure 11 is a plan view showing the structure of the first modified example at the cut line. [Figure 12] Figure 12 is a plan view showing the structure of the second modified example at the cut line. [Figure 13] Figure 13 is a plan view showing the structure of the third modified example at the cut line. [Figure 14] Figure 14 is a plan view showing the structure of the fourth modification example at the cut line. [Figure 15] Figure 15 is a plan view showing the structure of the fifth modification example at the cut line. [Figure 16] Figure 16 is a plan view showing the structure of the sixth modification example at the cut line. [Figure 17] Figure 17 is a plan view showing the structure of the seventh modification example at the cut line. [Figure 18] Figure 18 is a plan view showing the structure of the eighth modification example at the cut line. [Modes for carrying out the invention]

[0025] An embodiment of a packaging container will be described with reference to Figures 1 to 18. 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, 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. The direction from the left side plate 24 toward the right side plate 23, or from the right side plate 23 toward the left side plate 24, is the longitudinal direction DL.

[0032] The front plate 21, rear plate 22, and bottom plate 25 each have a rectangular 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 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 shape and face each other in the longitudinal direction DL. The bottom edge of the right side plate 23 connects to the bottom edge 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 of the main front panel 21B, and are positioned in the longitudinal direction DL so as to sandwich the central fastening portion 21S. 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 plate 21B. The cutting line 21FC has a curved shape that is convex towards the bottom plate 25 from one end near the front edge 21T of the main front plate 21B to the other end in the same vicinity. The flap 21F is enclosed by a portion of the front edge 21T and the cutting line 21FC. An example of the length of the longitudinal direction DL of the flap 21F is between 1 / 3 and 1 / 2 of the length of the longitudinal direction DL of the main front plate 21B. In the longitudinal direction DL, the flap 21F is located on both sides of the center of the longitudinal direction DL of the main front plate 21B. The cutting line 21FC may also have a curved shape with both ends near the front edge 21T of the main front plate 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 longitudinal direction DL. 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 longitudinal direction DL. 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] [Cover 30] Returning to Figure 1, the lid 30 comprises a lid plate 31, a front lid plate 32, a right side plate 33, and a left side plate 34. The lid plate 31 is rotatably connected to the upper edge 22T (see Figure 2) of the rear plate 22. When the opening tab 32K is cut from one end to the other, 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.

[0042] 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 adhesive portions 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 portions inside the notches 32C.

[0043] The front lid plate 32 has a cut line 32M extending across its entire width in the longitudinal direction DL, 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 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.

[0044] The front lid plate 32 has a covering piece 32P and an opening piece 32K connected to the tip edge of the covering piece 32P via a cut line 32M, and the opening piece 32K is adhered to the front surface of the front plate 21 by an adhesive part. The lid 30 is opened when the opening piece 32K is cut in the longitudinal direction DL from the opening end 32N toward the left end of the cut line 32M. In other words, the lid 30 is opened when the opening piece 32K is cut in the longitudinal direction DL from the right side toward the left side. The lid 30 can also be opened when the opening piece 32K is cut in the longitudinal direction DL from the left side toward the right side.

[0045] 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 longitudinal direction DL of the front lid plate 32 being the boundary. 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.

[0046] 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.

[0047] 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 of the longitudinal direction DL, except at both ends of the longitudinal direction DL, and the width in the height direction DH decreases as you move from the center of the longitudinal direction DL to each end. A cutting blade 35 is joined to the inner surface of the cover piece 32P.

[0048] The cutting blade 35 has a sawtooth shape with cutting edges aligned in the longitudinal direction DL. The cutting blade 35 is joined to the cover piece 32P such that, when the cover 30 is closed and the opening 20T is sealed, multiple cutting edges protrude downward from the cover piece 32P. The method of joining the cutting blade 35 to the cover piece 32P is, for example, by ultrasonic bonding with a sealant layer or adhesive layer interposed between the cover piece 32P and the cutting blade 35. Alternatively, the method of joining the cutting blade 35 to the cover piece 32P can be such that a sealant layer is laminated onto the blade material resin layer constituting the cutting blade 35.

[0049] 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.

[0050] 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.

[0051] 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 longitudinal direction DL and both ends that sandwich the central part in the longitudinal direction DL, 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 direction DL at the central part of the cutting blade 35 is, for example, 1 / 3 of the total length of the longitudinal direction DL of the 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] [Trimming line 32M] Refer to Figures 4 to 8 to explain the cut line 32M in more detail. Note that in Figures 4 to 16, for illustrative purposes, each cut 32R is shown extending linearly in the longitudinal direction DL. Also, each figure shows the front plate 21 as viewed from the front.

[0056] Figure 4 shows a magnified view of a portion of the cut line 32M on the front lid plate 32 before opening. As shown in Figure 4, the cut line 32M comprises a plurality of cuts 32R arranged at intervals in the longitudinal direction DL. Each cut 32R penetrates the front lid plate 32 along the thickness direction of the front lid plate 32. Each cut 32R has a first cut element 32R1 and a second cut element 32R2. The first cut element 32R1 extends along the leading edge of the cover piece 32P. The second cut element 32R2 extends in a direction intersecting the first cut element 32R1. Each cut 32R only needs to have at least one second cut element 32R2. Therefore, as shown in the example in Figure 4, each cut 32R may have only one second cut element 32R2 or two or more.

[0057] In the example shown in Figure 4, in the cut 32R, the first cut element 32R1 is positioned to protrude from the second cut element 32R2 in a direction along the tip edge of the cover piece 32P. If the cut 32R has two or more second cut elements 32R2, the first cut element 32R1 only needs to protrude from all of the second cut elements 32R2 in a direction along the tip edge of the cover piece 32P. In addition, at least one of the multiple cuts 32R constituting the cut line 32M may be a cut 32R having a first cut element 32R1 and a second cut element 32R2. In this case, the remaining cuts may have a shape such as a T-shape or a J-shape, in which the first cut element 32R1 does not protrude from the second cut element 32R2. Furthermore, 50% or more of all the cuts 32R constituting the cut line 32M may be cuts 32R having a first cut element 32R1 and a second cut element 32R2, and more preferably 80% or more. If cuts 32R having a first cut element 32R1 and a second cut element 32R2 account for 50% or more of the entire cut line 32M, the opening of the opening piece 32K can be carried out stably, and if it is 80% or more, the opening of the opening piece 32K can be carried out even more stably, which is even more preferable.

[0058] The first cut element 32R1 has a straight line along the direction in which the tip edge extends. In the direction along the tip edge, the total length L1 of the first cut element 32R1 from the right end to the left end may be, for example, 10 mm or more and 50 mm or less. By setting it within this range, the opening of the opening piece 32K can be stably carried out while ensuring strength to prevent unintended tearing. The total length L1 of the first cut element 32R1 is preferably 10 mm or more and 40 mm or less, and more preferably 15 mm or more and 30 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 becomes even more pronounced when using coated cardboard (as described below). The direction along the leading edge is the direction in which the leading edge extends. In the cut 32R, the lengths of the first cut elements 32R1 along the direction in which the leading edge extends may be the same or different.

[0059] The second cut element 32R2 has a straight line extending along a direction intersecting the first cut element 32R1. The second cut element 32R2 is perpendicular to the first cut element 32R1. One second cut element 32R2 penetrates the first cut element 32R1 at one point in the longitudinal direction DL. In the direction in which the second cut element 32R2 intersects the first cut element 32R1, the total length L2 of the second cut element 32R2 from its upper end to its lower end may be, for example, 1.0 mm or more and 6.0 mm or less. In the area of ​​the second cut element 32R2 that is closer to the cover piece 32P than the intersection with the first cut element 32R1, the second cut element 32R2 is formed on the cover piece 32P. By setting the range in this manner, a reduction in the strength of the cover piece 32P is prevented, and even if the tearing direction of the first cut element 32R1 shifts towards the cover piece 32P side or the opening piece 32K side, the second cut element 32R2 can catch the tear originating from the first cut element 32R1, thus enabling stable opening of the opening piece 32K. Furthermore, the length L2 of the second cut element 32R2 being 6.0 mm or less suppresses a reduction in the strength of the cover piece 32P and prevents tears from occurring in unintended directions from both ends of the second cut element 32R2, thereby suppressing the likelihood of damage to the winding body containment box 10.

[0060] The total length L2 of the second cut element 32R2 is preferably 1.4 mm to 5.0 mm, and more preferably 2.0 mm to 4.0 mm. 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 becomes even more pronounced when using coated cardboard (as described below).

[0061] In the crack 32R, at least one of the second crack elements 32R2 may intersect the first crack element 32R1 at a position 0.1 mm to 2.0 mm away from at least one end of the first crack element 32R1. The second crack element 32R2 intersects the first crack element 32R1 at a position 0.1 mm to 2.0 mm away from the right end of the first crack element 32R1. Since the length of the first crack element 32R1 protruding from the second crack element 32R2 is 0.1 mm or more, it is possible to increase the certainty that the crack originating from the first crack element 32R1 will connect between adjacent first crack elements 32R1 in the direction along the tip edge. Furthermore, since the length that the first cut element 32R1 protrudes from the second cut element 32R2 is 2.0 mm or less, when the cut line is torn from the end of the first cut element 32R1 toward the second cut element 32R2, the tear generated at the end of the first cut element is more likely to reach the second cut element 32R2. The length that the first cut element 32R1 protrudes from the second cut element 32R2 is preferably 0.3 mm or more and 1.5 mm or less, and more preferably 0.5 mm or more and 1.2 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 becomes even more pronounced when using coated cardboard (as described below). In the direction in which the leading edge extends, the distance between the right end of the first cut element 32R1 and the second cut element 32R2 is the amount of protrusion PA of the first cut element 32R1.

[0062] There may be multiple second-intersecting elements 32R2 that intersect the first-intersecting element 32R1. In that case, at least one of the multiple second-intersecting elements 32R2 should intersect the first-intersecting element 32R1 within the above range from at least one end of the first-intersecting element 32R1.

[0063] Furthermore, the condition that the protrusion amount PA falls within the range of 0.1 mm to 2.0 mm may be satisfied in all cuts 32R of the cut line 32M, or it may be satisfied in only one or more of the cuts 32R. Preferably, 50% or more of the cuts 32R of the cut line 32M have a protrusion amount PA within the range of 0.1 mm to 2.0 mm, and more preferably 80% or more. When 50% or more of the cuts 32R have a protrusion amount PA within the range of 0.1 mm to 2.0 mm, the certainty that a tear originating from a first cut element 32R1 connects to an adjacent first cut element 32R1 is increased, and a tear originating at the end of a first cut element 32R1 is more likely to reach the second cut element 32R2, thereby allowing the opening of the opening piece 32K to proceed more stably. It is even more preferable that 80% or more of the cuts 32R have a protrusion amount PA within the range of 0.1 mm to 2.0 mm, as this further enhances the above effect. Furthermore, the first cut element 32R1 may protrude from the second cut element 32R2 at its left end. In this case as well, the protrusion amount PA of the first cut element 32R1 may be within the range of 0.1 mm to 2.0 mm.

[0064] The second cut element 32R2 intersects the first cut element 32R1 at the center of its total length in the direction in which the second cut element 32R2 extends. The second cut element 32R2 may intersect the first cut element 32R1 at a position other than the center of its total length in the direction in which the second cut element 32R2 extends. In this case, it is preferable that the second cut element 32R2 intersects the first cut element 32R1 in a range that includes the center of the second cut element 32R2 in the direction in which the second cut element 32R2 extends and is included in 1 / 5 of the total length of the second cut element 32R2.

[0065] The cut 32R may further include a third cut element 32R3 that is inclined toward the cover piece 32P side from the end of the first cut element 32R1. The third cut element 32R3 extends toward the cover piece 32P in the height direction DH from the left end of the first cut element 32R1. The angle θ formed by the first cut element 32R1 and the third cut element 32R3 is obtuse. The angle θ may be, for example, within the range of 135° to 175°. The third cut element 32R3 is formed toward the cover piece 32P side, and by setting it to this range, it is possible to suppress the fragments of the cardboard on the cover piece 32P side that are generated when the opening piece 32K is cut off from coming into contact with the cutting blade 35, while preventing the tear generated from the third cut element 32R3 when the opening piece 32K is cut upward toward the cover piece 32P side from expanding beyond the second cut element 32R2. The angle θ is preferably 145° to 175°, more preferably 155° to 170°. 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 becomes even more pronounced when using coated cardboard (as described below). At each cut 32R, the angles θ may be the same or different.

[0066] The third cut element 32R3 may extend only from the left end of the first cut element 32R1, or may extend only from the right end of the first cut element 32R1. Alternatively, the third cut element 32R3 may extend from both ends of the first cut element 32R1. In any case, the angle θ is an obtuse angle. Also, the third cut element 32R3 is positioned between the first cut element 32R1 and the first cut element 32R1 in the direction along the leading edge. Further, the plurality of cuts 32R may include a cut 32R including the third cut element 32R3 and a cut 32R not including the third cut element 32R3. It is preferable that 50% or more of all the cuts 32R provided in the cut line 32M are cuts 32R including the third cut element 32R3, and more preferably 80% or more. When 50% or more of the cuts 32R are cuts 32R including the third cut element 32R3, it is preferable because a part of the leading edge of the cover piece side 32P is less likely to protrude toward the bottom plate 25 side with respect to the cut line 32M before opening. When 80% or more of all the cuts 32R provided in the cut line 32M are cuts 32R including the third cut element 32R3, the above-described effect is further enhanced. The total length L3 of the third cut element 32R3 may be, for example, 0.5 mm or more and 5.0 mm or less. Although the third cut element 32R3 is formed in the cover piece 32P, by setting it within such a range, while suppressing the cardboard pieces on the cover piece 32P side generated when the opening piece 32K is cut out from contacting the cutting blade 35, it is possible to prevent the tear generated from the third cut element 32R3 from exceeding the second cut element 32R2 and expanding when the opening piece 32K is cut up on the cover piece 32P side. The total length L3 of the third cut element 32R3 is preferably 1.0 mm or more and 4.0 mm or less, and more preferably 1.5 mm or more and 3.0 mm or less. By setting it within such a range, when using cardboard (especially 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 effect becomes more remarkable.

[0067] The length L3 of the third segment element 32R3 is as follows: In the third segment element 32R3, a virtual line is drawn perpendicular to the direction along the tip edge, passing through the end opposite to the side where the first segment element 32R1 and the third segment element 32R3 are connected. The distance from this virtual line to the end where the third segment element 32R3 is connected to the first segment element 32R1 is defined as the length L3 of the third segment element 32R3.

[0068] In the direction along the leading edge, the distance D between adjacent cuts 32R may be, for example, 0.5 mm or more and 3.0 mm or less. That is, in the direction along the leading edge, the length of the part of the front lid plate 32 where no cuts 32R are formed may be, for example, 0.5 mm or more and 3.0 mm or less. By setting it within this range, unintended breakage between adjacent cuts 32R is prevented, and stable cutting between cuts 32R is possible without requiring excessive force when opening the opening piece 32K. The distance D between adjacent cuts 32R is preferably 1.0 mm or more and 2.5 mm or less, more preferably 1.3 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 becomes even more pronounced when using coated cardboard as described below. The distance D between cuts 32R is as follows: In each adjacent cut 32R, a virtual line is set perpendicular to the direction along the leading edge, passing through the ends of the cut elements that are closest to each other among the cut elements constituting each cut 32R. The distance between these virtual lines is defined as the distance D between cuts 32R. Furthermore, adjacent cuts 32R may be any of the following: the first cut element 32R1 is adjacent to the first cut element 32R1, the first cut element 32R1 is adjacent to the second cut element 32R2, or the first cut element 32R1 is adjacent to the third cut element 32R3.

[0069] [Effect] The function of the perforated line 32M will be explained with reference to Figures 5 to 10. Below, the way the perforated line 32M is cut when the opening piece 32K is opened using the perforated line 32M of this disclosure will be explained with reference to Figures 5 to 8. On the other hand, the way the perforated line 32M is cut when the opening piece 32K is opened using a conventional perforated line 32M will be explained with reference to Figures 9 and 10.

[0070] In the examples shown in Figures 5 and 6, the cut 32R of the cut line 32M is a cut 32R consisting of a first cut element 32R1 and a second cut element 32R2. As shown in Figure 5, if the opening direction DA of the opening piece 32K is from the right end to the left end of the opening piece 32K when the front plate 21 is viewed from the front, the cut line 32M is cut from the right end to the left end. As a result, the cut 32R located on the right of two adjacent cuts 32R is cut from the left end of the first cut element 32R1 toward the first cut element 32R1 of the adjacent left cut 32R, thereby cutting out a portion of the opening piece 32K. In this case, since the distance between the left end of the right first cut element 32R1 and the right end of the left first cut element 32R1 is shortest in the direction along the leading edge, the opening piece 32K is easily cut so that the left end of the right first cut element 32R1 and the right end of the left first cut element 32R1 are connected. In the explanation from Figure 5 onward, when two cuts 32R are adjacent to each other, the cut 32R located on the right side of the figure will be referred to as the right cut 32R, and the cut 32R located on the left side will be referred to as the left cut 32R.

[0071] Furthermore, even if the cutting of the opening piece 32K progresses upward from the first cut element 32R1 on the right side, as long as the second cut element 32R2 extends in the height direction DH, the tear originating from the left end of the first cut element 32R1 will connect to the second cut element 32R2. This prevents the progress of cutting between the cut 32R located on the right side and the cut 32R located on the left side from being hindered, and prevents damage to the opening piece 32K caused by the tear originating from the first cut element 32R1 spreading upward beyond the second cut element 32R2.

[0072] Furthermore, the tearing of the opening piece 32K may progress from the right-side first tear element 32R1 further downward than the left-side first tear element 32R1. Even in this case, as long as the second tear element 32R2 extends in the height direction DH, the tear originating from the left end of the first tear element 32R1 will connect to the second tear element 32R2. This prevents the progress of tearing between the right-side tear element 32R and the left-side tear element 32R from being hindered, and prevents damage to the opening piece 32K caused by the tear originating from the first tear element 32R1 spreading downward beyond the second tear element 32R2.

[0073] As described above, if the length of the first tear element 32R1 protruding from the second tear element 32R2 is 0.1 mm or more, it is possible to increase the certainty that a tear originating from one first tear element 32R1 will connect to the other first tear element 32R1 in the direction along the tip edge of adjacent first tear elements 32R1.

[0074] Furthermore, it is preferable that the length of the first cut element 32R1 protruding from the second cut element 32R2 is 2.0 mm or less. If the length of the first cut element 32R1 protruding from the second cut element 32R2 is 2.0 mm or less, when the cut line 32M is torn from the end of the first cut element 32R1 toward the second cut element 32R2, the tear generated at the end of the first cut element 32R1 is more likely to reach either the first cut element 32R1 or the second cut element 32R2.

[0075] On the other hand, as shown in Figure 6, if the opening direction DA of the opening piece 32K is from the left end to the right end of the opening piece 32K when the front plate 21 is viewed from the front, the cut line 32M will be cut from the left end to the right end. As a result, a tear originating from the right end of the first cut element 32R1 of the cut 32R located on the left side, i.e., the opening start side, is likely to connect to the left end of the first cut element 32R1 of the adjacent cut 32R on the right side.

[0076] As described above, if the length of the first cut element 32R1 protruding from the second cut element 32R2 is 0.1 mm or more, cutting is more likely to start from the tip of the first cut element 32R1 than from both ends of the second cut element 32R2. Therefore, in the direction along the tip edge, it is possible to increase the certainty that a crack originating from one first cut element 32R1 will connect to the other first cut element 32R1. Also, if the distance between adjacent cuts 32R is between 0.5 mm and 3.0 mm, a crack originating at the end of one cut 32R is more likely to reach the end of the other cut 32R.

[0077] In the examples shown in Figures 7 and 8, the cut 32R of the cutting line 32M is a cut 32R consisting of a first cut element 32R1, a second cut element 32R2, and a third cut element 32R3. As shown in Figure 7, if the opening direction DA of the opening piece 32K is from the right end to the left end of the opening piece 32K when the front plate 21 is viewed from the front, the cutting line 32M will be cut from the right end to the left end. As a result, the rightmost of two adjacent cuts 32R will have a portion of the opening piece 32K cut from the left end of the third cut element 32R3 toward the adjacent left cut 32R. In this case, since the distance between the left end of the right third cut element 32R3 and the right end of the left first cut element 32R1 is shortest in the direction along the leading edge, the opening piece 32K is easily cut so that the left end of the third cut element 32R3 and the right end of the first cut element 32R1 are connected.

[0078] Furthermore, even if the cutting of the opening piece 32K progresses upward from the third cut element 32R3 on the right side, as long as the second cut element 32R2 extends in the height direction DH, the tear originating from the left end of the third cut element 32R3 will connect to the second cut element 32R2. This prevents the progress of cutting between the cut 32R located on the right side and the cut 32R located on the left side from being hindered, and prevents damage to the opening piece 32K caused by the tear originating from the third cut element 32R3 spreading upward beyond the second cut element 32R2.

[0079] Furthermore, the tearing of the opening piece 32K may progress from the third tear element 32R3 on the right side further downward than the first tear element 32R1 on the left side. Even in this case, as long as the second tear element 32R2 extends in the height direction DH, the tear originating from the left end of the third tear element 32R3 will connect to the second tear element 32R2. This prevents the progress of tearing between the tear element 32R on the right side and the tear element 32R on the left side from being obstructed, and prevents damage to the opening piece 32K caused by the tear originating from the third tear element 32R3 spreading further downward than the second tear element 32R2.

[0080] As described above, it is preferable that the length of the first cut element 32R1 protruding from the second cut element 32R2 is 2.0 mm or less. This prevents the angle formed by the straight line connecting the left end of the third cut element 32R3 and the upper end of the second cut element 32R2 from becoming small, and the straight line connecting the left end of the third cut element 32R3 and the lower end of the second cut element 32R2 from becoming small. Therefore, when the cut line 32M is torn from the end of the third cut element 32R3 toward the second cut element 32R2, the tear that occurs at the end of the third cut element 32R3 is more likely to reach the second cut element 32R2.

[0081] Furthermore, it is preferable that the total length of the second cut element 32R2 is between 1.0 mm and 6.0 mm. This makes it easier to reach the second cut element 32R2 even if the direction of the tear at the end of the first cut element 32R1 deviates slightly in the vertical direction when the cut line 32M is torn from the end of the first cut element 32R1 toward the second cut element 32R2.

[0082] Furthermore, the third cut element 32R3 is inclined toward the cover piece 32P. Therefore, when the cut line 32M is opened along the direction from the first cut element 32R1 toward the third cut element 32R3, the direction in which the cut line 32M is cut is guided toward the cover piece 32P. As a result, after the opening piece 32K is opened along the cut line 32M, the fragments of the cardboard of the cover piece 32P that are generated when the opening piece 32K is cut are less likely to protrude toward the cutting blade 35 side relative to the cut line 32M before opening, thus not affecting the cutting performance of the cutting blade 35, and further improving the aesthetic appearance after the opening piece 32K is opened. In addition, if the length L3 of the third cut element 32R3 is 0.5 mm or more and 5.0 mm or less, the certainty that the direction in which the cut line 32M is cut is guided by the third cut element 32R3 can be increased.

[0083] On the other hand, as shown in Figure 8, if the opening direction DA of the opening piece 32K is from the left end to the right end of the opening piece 32K when the front plate 21 is viewed from the front, the cutting line 32M will be cut from the left end to the right end. As a result, a tear originating from the right end of the first cut element 32R1 of the cut 32R located on the left side (opening start side) is likely to connect to the left end of the third cut element 32R3 of the adjacent cut 32R on the right side.

[0084] Even if a tear occurs along the tip edge at the upper and lower ends of the second cut element 32R2, which is located on the left side, a tear is more likely to occur at the right end of the first cut element 32R1, which is located on the left side, and the tear that occurs at the right end of the first cut element 32R1 is most likely to reach the third cut element 32R3 on the right side. As a result, even if a tear occurs at the upper and lower ends of the second cut element 32R2 on the left side, the tear that occurs at the right end of the first cut element 32R1 is more likely to reach the third cut element 32R3 on the right side. Therefore, the progression of the tear that occurs at the upper and lower ends of the second cut element 32R2 is suppressed, and as a result, the tearing of the opening piece 32K and the damage to the cover piece 32P are suppressed.

[0085] As described above, if the length of the first cut element 32R1 protruding from the second cut element 32R2 is 0.1 mm or more, it is possible to increase the certainty that a crack originating from the first cut element 32R1 will connect to the third cut element 32R3 between adjacent first cut elements 32R1 and third cut elements 32R3 in the direction along the tip edge. Furthermore, if the distance between adjacent cut elements 32R1 and third cut elements 32R3 is between 0.5 mm and 3.0 mm, a crack originating at the end of one cut element 32R is more likely to reach the end of the other cut element 32R.

[0086] Thus, with the lid front plate 32 equipped with the perforation line 32M of this disclosure, the opening piece 32K is easily opened regardless of whether the opening direction DA is from the right end to the left end or from the left end to the right end. In addition, regardless of the direction of the opening direction DA, if the length of the first cut element 32R1 is 10 mm or more and 50 mm or less, a tear will be reliably created along the perforation line 32M, thereby reliably separating the opening piece 32K from the lid piece 32P.

[0087] As shown in Figure 9, when the front lid plate 32 has a conventional J-shaped cut 132R, when the front plate 21 is viewed from the front, the opening piece 32K is cut from the right end to the left end, so that the cut progresses from the left end of the third cut element 132R3 on the right side toward the adjacent second cut element 132R2 on the left side. Here, the cut 132R has a second cut element 132R2 that extends along the height direction DH, but the first cut element 132R1 of the cut 132R does not protrude from the second cut element 132R2. In the height direction DH, as long as the second cut element 132R2 extends, the tear originating from the left end of the third cut element 132R3 connects to the second cut element 32R2. This prevents the tear originating from the third tear element 132R3 from spreading upward beyond the second tear element 132R2, and from spreading downward beyond the second tear element 132R2, thereby reducing damage to the opening piece 32K.

[0088] On the other hand, as shown in Figure 10, when the front plate 21 is viewed from the front, the cut line 32M is cut from the left end to the right end. As a result, when the opening piece 32K is cut from the left cut 132R towards the right cut 132R, an external force is more likely to be applied to the upper or lower end of the second cut element 132R2. Consequently, the portion of the opening piece 32K sandwiched between the left cut 132R and the right cut 132R begins to be cut from the upper or lower end of the second cut element 132R2 in the height direction DH. Therefore, the tear originating from the second cut element 132R2 is less likely to reach the first cut element 132R1 or the third cut element 132R3 of the right cut 132R. This can result in the opening piece 32K tearing off midway in the opening direction DA, or the tip edge of the cover piece 32P being cut in an unintended shape.

[0089] Thus, with the conventional cut line 32M consisting of the cut 132R, the opening piece 32K is easy to open if the opening direction DA is from the right end to the left end. On the other hand, with the cut line 32M consisting of the cut 132R, the opening piece 32K is not easy to open if the opening direction DA is from the left end to the right end.

[0090] As described above, according to one embodiment of the packaging container, the following effects can be obtained. (1) When opening the opening piece 32K from either one end or the other end, a tear originating from one first cut element 32R1 easily connects to the other first cut element 32R1 between adjacent first cut elements 32R1 in the direction along the leading edge. Therefore, it is possible to easily open the opening piece 32K in both the direction from one end to the other and the direction from the other end to the first end.

[0091] (2) If the length of the first cut element 32R1 protruding from the second cut element 32R2 is 0.1 mm or more, it is possible to increase the certainty that a crack originating from one first cut element 32R1 will connect to the other first cut element 32R1 in the direction along the tip edge of adjacent first cut elements 32R1.

[0092] (3) If the length of the first cut element 32R1 protruding from the second cut element 32R2 is 2.0 mm or less, when the cut line 32M is torn from the end of the first cut element 32R1 toward the second cut element 32R2, the tear that occurs at the end of the first cut element 32R1 is more likely to reach the first cut element 32R1 or the second cut element 32R2.

[0093] (4) Because the third cut element 32R3 is inclined toward the cover piece 32P, after the opening piece 32K is opened along the cut line 32M, a portion of the leading edge of the cover piece 32P is less likely to protrude toward the bottom plate 25 relative to the cut line 32M before opening.

[0094] (5) When the distance between adjacent cuts 32R is 0.5 mm or more and 3.0 mm or less, a tear that occurs at the end of one of two adjacent cuts 32R in the direction along the tip edge is more likely to reach the end of the other cut 32R.

[0095] (6) If the length of the first cut element 32R1 is 10 mm or more and 50 mm or less, a tear will be reliably made along the cut line 32M, thereby reliably separating the opening piece 32K from the cover piece 32P.

[0096] (7) When the length of the second cut element 32R2 is 1.0 mm or more and 6.0 mm or less, when the cut line 32M is torn from the end of the first cut element 32R1 toward the second cut element 32R2, the tear that occurs at the end of the first cut element 32R1 is more likely to reach the second cut element 32R2.

[0097] (8) When the length of the third cutting element 32R3 is 0.5 mm or more and 5.0 mm or less, the certainty that the direction in which the cutting line 32M is cut is guided by the third cutting element 32R3 can be increased.

[0098] (9) If 50% or more of the cuts 32R constituting the cut line 32M are cuts 32R having a first cut element 32R1 and a second cut element 32R2, then the opening piece 32K can be easily opened in both the direction from one end to the other and the direction from the other end to the one end.

[0099] [Examples] First, we will explain the evaluation methods used in the examples and comparative examples. [Evaluation Method] In each example and comparative example sample, the opening piece was cut (peeled off). While holding the cover piece with a hand, the opening piece was opened from the right and left sides, and the opening state was checked. The test was performed three times on both the left and right sides for each example and comparative example. "○" indicated that it opened without problems all three times on both sides, "△" indicated that it could be opened all three times on both sides, although there was a small part that did not open properly, and "×" indicated that the opening failed to open all three times on both sides, such as the opening piece tearing midway.

[0100] For each example and comparative example, the conditions for the cuts included in the cut line were set as shown in Table 1: A: the length of the first cut element from one end of the first cut element to the point where it intersects with the second cut element, B: the total length of the second cut element, and C: the distance between adjacent cuts. A is the projection amount PA of the first cut element. Each cut consists of the first cut element and the second cut element, and does not include the third cut element. The dimensions (mm) of A, B, and C are shown in Table 1. In Table 1, A = "0" means that the second cut element is located at the end of the first cut element. Also, B = "0" means that the cut does not have a second cut element. Furthermore, the total length of the first cut element is set to 12 mm in the center of the longitudinal DL of the opening piece, and 14 mm at both ends flanking the center in the longitudinal DL, and the first cut element intersects with the second cut element at the center of the total length of the second cut element. Note that the length of the longitudinal DL in the center of the opening piece is 1 / 3 of the length of the longitudinal DL of the entire opening piece.

[0101] In each example and comparative example, the cutting lines were prepared with all cuts of the dimensions shown in Table 1, and the packaging containers were prepared.

[0102] The design of the adhesive area for attaching the opening piece to the front panel was based on the design of the adhesive area of ​​the 30cm x 50m brand of NEW Kurewrap (registered trademark) manufactured by Kureha Corporation. The adhesive area consisted of a roughly elliptical adhesive area and a circular adhesive area. The roughly elliptical adhesive area measured 9mm in the longitudinal direction and 6mm in the height direction, while the circular adhesive areas measured 7mm x 7mm and 4mm x 4mm. One roughly elliptical adhesive area was placed at the left end of the front panel in the longitudinal direction, one 7mm x 7mm circular adhesive area was placed at the right end of the front panel in the longitudinal direction, and six 4mm x 4mm circular adhesive areas were placed in the center, for a total of eight adhesive areas. The edges of the adhesive areas did not have through-cut lines or non-through-cut lines, and in all cases, there was a portion on the front panel where the release varnish was not applied to form the adhesive area.

[0103] The evaluation results are shown in Table 1 below. In Table 1, a downward arrow indicates that the value is the same as the value in the cell located above it.

[0104] [Table 1]

[0105] The above-described embodiment can be implemented with the following modifications. [break] As described above, the gap 32R may comprise only the third gap element 32R3 extending from the left end of the first gap element 32R1, in addition to the first gap element 32R1 and the second gap element 32R2, or it may comprise only the third gap element 32R3 extending from the right end of the first gap element 32R1. Alternatively, the gap 32R may comprise both the third gap element 32R3 extending from the left end of the first gap element 32R1 and the third gap element 32R3 extending from the right end.

[0106] The cut line 32M may include, in addition to the first cut element 32R1 and the second cut element 32R2, two or more of the following: a cut 32R having a third cut element 32R3 extending from the left end of the first cut element 32R1, a cut 32R having a third cut element 32R3 extending from the right end of the first cut element 32R1, and a cut 32R having a third cut element 32R3 extending from both ends of the first cut element 32R1.

[0107] In all cuts 32R, the first cut element 32R1 does not have to protrude from the second cut element 32R2. That is, multiple cuts 32R may have one or more cuts 32R in which the first cut element 32R1 protrudes from the second cut element 32R2, and cuts 32R in which the first cut element 32R1 protrudes from the second cut element 32R2 may be mixed with cuts 32R in which the first cut element 32R1 does not protrude from the second cut element 32R2.

[0108] In this case, it is preferable that the leftmost cut 32R on the cutting line 32M is a cut 32R in which the first cut element 32R1 protrudes from the second cut element 32R2. This makes it easier to open the opening piece 32K even when the opening piece 32K is opened from the left end when the front plate 21 is viewed from the front. Furthermore, when the cutting line 32M is V-shaped, it is preferable that, when the front plate 21 is viewed from the front, the cut 32R located to the right of the valley of the V-shape (the part where the tip edge of the cover piece 32P protrudes most towards the bottom plate 25) is the cut 32R closest to the valley of the V-shape in which the first cut element 32R1 protrudes from the second cut element 32R2. This makes it easier to cut the opening piece 32K without tearing even after passing the valley of the V-shape, which is the inflection point of the cutting line 32M.

[0109] The cut line 32M of this disclosure may have at least one cut 32R satisfying the following: the cut line 32M comprises a first cut element 32R1 and a second cut element 32R2. The first cut element 32R1 extends along the leading edge of the cover piece 32P, and the second cut element 32R2 extends in a direction intersecting the first cut element 32R1. The first cut element 32R1 is positioned relative to the second cut element 32R2 such that it protrudes from all of the second cut elements 32R2.

[0110] The gap 32R may satisfy at least one of the following conditions 1 to 5. That is, the gap 32R may satisfy only one of the conditions 1 to 5, or it may satisfy two or more of the conditions 1 to 5.

[0111] As shown in Figure 11, the cut 32R may satisfy the following condition 1. (Condition 1) The total length L1 of the first cut element 32R1 is longer than the total length L2 of the second cut element 32R2.

[0112] Since the length L1 of the first cut element 32R1 is longer than the length L2 of the second cut element 32R2, the direction in which the cut line 32M is cut is easily guided in the direction in which the first cut element 32R1 extends.

[0113] As shown in Figure 12, the cut 32R may satisfy the following condition 2. (Condition 2) The second cut element 32R2 intersects the first cut element 32R1 at a point closer to the opening end 32N than the center of the first cut element 32R1 in the direction in which the tip edge extends.

[0114] In the example shown in Figure 12, the opening end 32N is located at the right end of the cut 32R. Therefore, the second cut element 32R2 intersects the first cut element 32R1 to the right of its center in the direction along the tip edge. In the direction along the tip edge, the length from the left end of the first cut element 32R1 to the second cut element 32R2 is the left-side length L1L. In the direction along the tip edge, the length from the right end of the first cut element 32R1 to the second cut element 32R2 is the right-side length L1R. The left-side length L1L is longer than the right-side length L1R.

[0115] The second cut element 32R2 intersects the first cut element 32R1 closer to the opening end 32N than the center of the first cut element 32R1. Therefore, when the opening piece 32K is opened from the opening end 32N, the reliability of preventing the tear extending from the cut line 32M in the height direction DH from exceeding the upper and lower ends of the second cut element 32R2 and reaching the second cut element 32R2 is increased.

[0116] As shown in Figure 13, the cut 32R may satisfy the following condition 3. (Condition 3) The angle θ32R formed by the first break element 32R1 and the second break element 32R2 is between 45° and 90°.

[0117] Since the angle θ32R falls within the range of 45° to 90°, when the opening piece 32K is opened from the opening end 32N, the certainty that a tear extending from the cut line 32M in the height direction DH will not extend beyond the upper and lower ends of the second cut element 32R2 and reach the second cut element 32R2 is increased.

[0118] As shown in Figure 14, the first distance D1 is the distance between the left end of the first cut element 32R1 in the right cut 32R and the right end of the first cut element 32R1 in the left cut 32R adjacent to the right cut 32R, in the direction along the tip edge. The first distance D1 is determined by setting up two imaginary lines: one passing through the left end of the first cut element 32R1 in the right cut 32R and perpendicular to the direction along the tip edge, and another passing through the right end of the first cut element 32R1 in the left cut 32R and perpendicular to the direction along the tip edge. The distance between these imaginary lines is defined as the first distance D1. Furthermore, in the direction along the tip edge, the second distance D2 is the distance between the left end of the first cut element 32R1 in the right cut 32R and the end of the second cut element 32R2 in the left cut 32R that is closest to the first cut element 32R1 on the right. The second distance D2 is defined by setting up two imaginary lines: one passing through the left end of the first cut element 32R1 in the right cut 32R and perpendicular to the direction along the tip edge, and another passing through the end of the second cut element 32R2 in the left cut 32R that is closest to the first cut element 32R1 on the right and perpendicular to the direction along the tip edge. The distance between these imaginary lines is defined as the second distance D2.

[0119] In the example shown in Figure 14, the upper end of the second cut element 32R2 in the left cut 32R is the end closest to the first cut element 32R1 on the right. Two adjacent cuts 32R in the direction along the leading edge may satisfy the following condition 4.

[0120] (Condition 4) The first distance D1 is shorter than the second distance D2. As a result, the right end of the first cut element 32R1 located on the left side is closest to the left end of the first cut element 32R1 located on the right side. This makes it easier for the tear to connect between the left and right first cut elements 32R1 when the opening piece 32K is opened from the left end to the right end, making it easier to cut off the opening piece 32K. It is also preferable that condition 4 is satisfied when the lower end of the second cut element 32R2 in the left cut 32R is the end closest to the right first cut element 32R1.

[0121] As shown in Figure 15, one cut 32R may comprise two second cut elements 32R2. In the example shown in Figure 15, one second cut element 32R2 intersects the first cut element 32R1 near its right end, and the other second cut element 32R2 intersects the first cut element 32R1 near its left end. One second cut element 32R2 has a slope such that it approaches the right end of the first cut element 32R1 as it approaches its lower end. The other second cut element 32R2 has a slope such that it approaches the left end of the first cut element 32R1 as it approaches its lower end.

[0122] Distance D1 is the distance between the left end of the first cut element 32R1 in the right cut 32R and the right end of the first cut element 32R1 in the left cut 32R adjacent to the right cut 32R, along the tip edge. Distance D3 is the shortest distance between the second cut element 32R2 in the left cut 32R and the second cut element 32R2 in the right cut 32R, along the tip edge. Distance D3 is the distance between the lower ends of the second cut elements 32R2. The third distance D3 is defined by setting up a virtual line perpendicular to the direction along the tip edge, passing through the end of the second cut element 32R2 in the right cut 32R that is closer to the left cut 32R, and a virtual line perpendicular to the direction along the tip edge, passing through the end of the second cut element 32R2 in the left cut 32R that is closer to the right cut 32R. The distance between these virtual lines is defined as the third distance D3. Two adjacent cuts 32R in the direction along the tip edge may satisfy the following condition 5.

[0123] (Condition 5) The first distance D1 is shorter than the third distance D3. As a result, the right end of the first tear element 32R1 located on the left side is closest to the left end of the first tear element 32R1 located on the right side. This makes it easier for the tear to connect between the left and right first tear elements 32R1 when the opening piece 32K is opened from the left end to the right end, making it easier to cut off the opening piece 32K.

[0124] Furthermore, the left-side cut 32R may have only a second cut element 32R2 that intersects the first cut element 32R1 near the right end, and the right-side cut 32R may also have only a second cut element 32R2 that intersects the first cut element 32R1 near the left end. In this case as well, it is preferable that the above-described condition 5 is satisfied.

[0125] The second split element 32R2 may be divided in the height direction DH such that it sandwiches the first split element 32R1. As shown in Figure 16, the second gap element 32R2 is composed of the first element 32R21 and the second element 32R22. The first element 32R21 and the second element 32R22 each have a straight line extending along the height direction DH. The first element 32R21 and the second element 32R22 are spaced apart in the height direction DH. In the height direction DH, the first gap element 32R1 is located between the first element 32R21 and the second element 32R22. In the height direction DH, the first element 32R21 is located above the first gap element 32R1, and the second element 32R22 is located below the first gap element 32R1. The lower end of the first element 32R21 is separated from the first gap element 32R1. The upper end of the second element 32R22 is separated from the first gap element 32R1. In the direction along the leading edge, the first element 32R21 and the second element 32R22 are positioned at the same location.

[0126] Furthermore, as shown in Figure 17, the positions of the first element 32R21 and the second element 32R22 may differ in the direction along the tip edge. In the example shown in Figure 17, the second element 32R22 is located to the right of the first element 32R21. The second element 32R22 may also be located to the left of the first element 32R21. In this case, the distance between the first element 32R21 and the second element 32R22 in the direction along the tip edge is preferably within a range of, for example, 1.0 mm or less.

[0127] Furthermore, as shown in Figure 18, the first element 32R21 and the second element 32R22 may extend along a direction intersecting the height direction DH. In the example shown in Figure 18, the first element 32R21 and the second element 32R22 are symmetrical with respect to each other when the first cut element 32R1 is the axis of symmetry. The first element 32R21 has a slope such that it approaches the right end of the first cut element 32R1 as it approaches its upper end. The second element 32R22 has a slope such that it approaches the right end of the first cut element 32R1 as it approaches its lower end.

[0128] [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]

[0129] DH... Height direction DL...longitudinal direction DW…Front and back direction 10...Rotating body containment box 20…Container body 20T…Aperture 21… Front panel 21F...Flap 22…Rear plate 25…Bottom plate 30... Lid 31…Lid plate 32…Lid front plate 32P…cover piece 32K...opening piece 32M…cutting line 32R... Gap 32R1...First break element 32R2...Second break element 32R3... Third break element 35…Cutting blade 50... Wrap film 50R... coiled body

Claims

1. The top is open and the container body contains the contents, The container body has a lid that is 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 device comprises an opening piece connected to the tip edge of the aforementioned cover piece via a perforated line, A packaging container in which the opening is opened and closed by the lid, as the opening piece is cut from one end to the other, the lid rotates on its upper edge as an axis, The aforementioned cutting line comprises a plurality of cuts arranged at intervals along the longitudinal direction of the packaging container. In at least one of the plurality of cuts, the cut has a first cut element extending along the leading edge and at least one second cut element extending in a direction intersecting the first cut element. The first cut element is positioned so as to protrude from all of the second cut elements. packaging container.

2. At least one of the second break elements is Intersecting the first cut element at a position 0.1 mm to 2.0 mm away from at least one end of the first cut element The packaging container according to claim 1.

3. The aforementioned break is, The present invention further comprises a third cut element that is inclined toward the cover piece side from at least one end of the first cut element. The packaging container according to claim 1 or 2.

4. In the direction along the aforementioned tip edge, the distance between adjacent cuts is 0.5 mm or more and 3.0 mm or less. The packaging container according to claim 1 or 2.

5. In the direction along the aforementioned tip edge, the distance between adjacent cuts is 0.5 mm or more and 3.0 mm or less. The packaging container according to claim 3.

6. The length of the first cut element in the direction along the tip edge is 10 mm or more and 50 mm or less. The packaging container according to claim 1 or 2.

7. The length of the second break element in the aforementioned intersecting direction is 1.0 mm or more and 6.0 mm or less. The packaging container according to claim 1 or 2.

8. The length of the third cut element is 0.5 mm or more and 5.0 mm or less. The packaging container according to claim 3.

9. The aforementioned cutting line is such that cuts having the first cut element and the second cut element account for 50% or more of all the cuts. The packaging container according to claim 1 or 2.

Images