Storage box storing wrap film wound body

Abstract

To provide a storage box storing a wrap film wound body that suppresses longitudinal tear during a recovery operation.SOLUTION: A cutter blade with which a storage box storing a wrap film wound body is provided satisfies conditions A, B, and C. Tooth width / tooth height of a first tooth has a value of 2.0 or more (condition A). An oblique side of the first tooth and an oblique side of a second tooth are connected to each other by one arc; the oblique side of the first tooth and an oblique side of a third tooth are connected to each other by the other arc; and each arc has a curvature radius of 0.5 mm2 or more (condition B). An area of the first tooth partitioned by the oblique side of the first tooth and a tooth bottom line of the first tooth is 0.6 mm2 or less (condition C).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a storage box containing a wrap film roll that contains a wrap film roll. [Background technology]

[0002] Wrap films containing polyvinylidene chloride resins are widely used in households and other places because they provide high cutting properties and high adhesion. The wrap film is wound into a roll around a long cylindrical core and stored in a rectangular storage box equipped with a main body, a lid, and a cutting blade. When using the wrap film, a user holds the storage box with the lid open in one hand and pulls out the wrap film from the storage box with the other hand. Then, while holding the storage box with the lid closed in one hand, the user cuts the wrap film held with the other hand using the cutting blade.

[0003] In this case, the leading end of the wrap film roll sandwiched between the lid and the main body may get into the storage box through the gap between the lid and the main body, which is known as rewinding. The leading end of the wrap film roll that gets into the storage box sticks to the outermost surface of the wrap film roll. The recovery process of peeling the stuck leading end from the outermost surface of the wrap film roll and returning it back between the lid and the main body is likely to cause vertical tears in which the wrap film tears in the winding direction from the cut end of the wrap film.

[0004] As a technique for suppressing vertical tearing during restoration work, it has been proposed to reduce the distance between the tooth tip and the tooth valley line of the cutting blade to reduce the area of ​​the ridge formed in the blade mark on the wrap film, and to increase the distance between the tooth tips of adjacent teeth on the cutting blade to increase the length of the tooth valley and the curvature radius R (see, for example, Patent Document 1). When the tooth tips of adjacent teeth are inserted into the package and the breaks initiated by the respective tooth tips join, the break initiated by one of the adjacent teeth progresses excessively, causing a notch (crack) at the joining point of the breaks. With the above configuration, the stress concentrated on the tooth valley in the blade mark during restoration work can be reduced, and stress can be made less likely to concentrate on the tip of the notch. As a result, vertical tearing of the wrap film during restoration work can be made less likely to occur. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-196220 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, vertical cracks during restoration work still occur, so there is a strong need for technology to prevent vertical cracks during restoration work. [Means for solving the problem]

[0007] A storage box containing a wrap film roll for solving the above problem comprises a wrap film roll in which wrap film is wound in the flow direction, and a storage box that stores the wrap film roll. The storage box comprises a container body having a bottom plate, a front plate, a rear plate, and a pair of side plates, the container body having an open top surface for storing the wrap film roll, and a lid. The lid comprises a lid plate connected to an upper end edge of the rear plate and configured to be able to open and close the opening of the container body, a lid front plate connected to the lid plate and overlapping the outside of the front plate when the lid plate closes the opening of the container body, and a cutting blade having a plurality of teeth extending in a width direction that is perpendicular to the flow direction, the cutting blade cutting the wrap film that is unwound from the wrap film roll and pulled out from between the front plate and the lid front plate. The plurality of teeth on the cutting blade include a first tooth, a second tooth adjacent to the first tooth on the outside in the width direction, and a third tooth adjacent to the first tooth on the inside in the width direction, and the first tooth satisfies the following conditions A, B, and C.

[0008] (Condition A) The first tooth bottom is the lowest point at the intersection of the outer hypotenuse of the first tooth in the width direction and the inner hypotenuse of the second tooth in the width direction, and the second tooth bottom is the lowest point at the intersection of the inner hypotenuse of the first tooth in the width direction and the outer hypotenuse of the third tooth in the width direction, the tooth width is the distance in the width direction between the first tooth bottom and the second tooth bottom, a straight line connecting the first tooth bottom and the second tooth bottom is a tooth bottom line, the tooth height is the distance from the tooth tip of the first tooth to the tooth bottom line of a perpendicular line drawn from the tooth tip to the tooth bottom line, and the value of the tooth width / the tooth height is 2.0 or more.

[0009] (Condition B) The outer hypotenuse of the first tooth in the width direction and the inner hypotenuse of the second tooth in the width direction are connected by a circular arc, and the inner hypotenuse of the first tooth in the width direction and the outer hypotenuse of the third tooth in the width direction are connected by another circular arc, and the radius of curvature R of each arc is 0.5 mm or more.

[0010] (Condition C) The area of ​​the first tooth bounded by the outer hypotenuse in the width direction of the first tooth, the inner hypotenuse in the width direction of the first tooth, and the tooth base line of the first tooth is 0.6 mm 2 The following is the result.

[0011] In a storage box containing a roll of wrap film to solve the above problem, the average value of the tear strength of the wrap film in the machine direction and the tear strength of the wrap film in the width direction may be 25 mN or more.

[0012] In order to solve the above problem, a container box containing a wrap film roll is provided, which has a surface adhesion strength (N / 25 cm 2 ) to the area of ​​the first tooth (mm 2 ) to obtain the adhesion index of the wrap film. The adhesion index may be 9.0 or less.

[0013] In a storage box containing a roll of wrap film to solve the above-mentioned problems, 50% or more of the total number of the teeth on the cutting blade may be the first teeth.

[0014] In a storage box containing a roll of wrap film to solve the above problem, the cutting blade may include a central area and a pair of outer areas arranged outside the central area in the width direction, the central area may include a plurality of the teeth, the outer areas may include a plurality of the teeth, and the first tooth may be located in at least one of the pair of outer areas.

[0015] In a storage box containing a roll of wrap film to solve the above problem, the pair of outer areas may include a pair of side areas adjacent to the outside of the central area in the width direction, and a pair of end areas arranged outside the pair of side areas in the width direction, and the first tooth may be located in at least one of the pair of end areas. Effect of the Invention

[0016] The storage box for wrapped wrap film according to the present disclosure can prevent vertical tearing of the wrap film during recovery work. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing the external structure of a storage box containing a roll of wrap film. [Diagram 2] FIG. 2 is a perspective view showing the internal structure of the container box containing the wrap film roll. [Diagram 3] FIG. 3 is a plan view showing a blank for manufacturing a storage box. [Figure 4] FIG. 4 is a front view showing the front structure of the cutting blade. [Diagram 5] FIG. 5 is a partial enlarged view showing the central area of ​​the cutting blade. [Figure 6] FIG. 6 is a partial enlarged view showing a side area of ​​the cutting blade. [Figure 7] FIG. 7 is a partial enlarged view showing an end area of ​​the cutting blade. [Figure 8] FIG. 8 is a plan view showing the tooth shape of the downwardly inclined teeth. [Figure 9] FIG. 9 is a plan view showing the tooth shape of the outwardly inverted teeth. [Figure 10] FIG. 10 is a schematic diagram showing a state in which the attached tip portion is peeled off. [Figure 11] FIG. 11 is a plan view showing the tooth shape of the first tooth. [Figure 12] FIG. 12 is an explanatory diagram for explaining a method for measuring the valley crack strength. [Figure 13] FIG. 13 is a table showing the evaluation results of the test examples. [Figure 14] FIG. 14 is a table showing the evaluation results of the test examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] One embodiment of a storage box containing a wrap film roll will be described with reference to Fig. 1 to Fig. 14. Fig. 1 shows a storage box 10 containing a wrap film roll before opening. Fig. 2 shows a storage box 10 containing a wrap film roll after opening (hereinafter also simply referred to as storage box 10). The storage box 10 includes a wrap film roll (hereinafter also simply referred to as roll 50R).

[0019] 2, the storage box 10 has a rectangular parallelepiped shape extending in one direction. The storage box 10 is manufactured by folding and gluing a blank (see FIG. 3) made of a sheet of cardboard such as coated cardboard along lines L, LT, LT2, and LR.

[0020] The roll 50R comprises a paper cylinder 50C that serves as a core material, and the wrap film 50. The wrap film 50 is wound around the cylinder 50C in the flow direction. The flow direction is the direction in which the wrap film 50 is pulled out. The length of the cylinder 50C in the axial direction A is longer than the length of the wrap film 50 in the width direction DL. The width direction DL of the wrap film 50 is perpendicular to the flow direction. Both ends of the cylinder 50C in the axial direction A protrude beyond the film ends of the rolled wrap film 50.

[0021] [Storage Box 10] The 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 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, the rear plate 22, the right side plate 23, and the left side plate 24 stand upright from the bottom plate 25 and form a single peripheral wall.

[0022] The material constituting the container body 20 and the lid body 30 is not particularly limited, and may be, for example, plastic, metal, cardboard, a laminated plate in which multiple pieces of cardboard are laminated, or a single sheet of cardboard. From the viewpoint of ease of handling in manufacturing the storage box 10, the material constituting the container body 20 and the lid body 30 is preferably paperboard such as coated cardboard.

[0023] An opening 20T, which is an upper opening of the container body 20, is defined by the upper side of the peripheral wall. The wound body 50R is inserted and removed through the opening 20T. An axial direction A of the wound body 50R is substantially parallel to the direction in which the storage box 10 extends.

[0024] In the following description, the side of the opening 20T relative to the bottom plate 25 is referred to as the upper side, and the side of the bottom plate 25 relative to the opening 20T is referred to as the lower side. In addition, the side of the rear plate 22 relative to the front plate 21 is referred to as the rear side, and the side of the front plate 21 relative to the rear plate 22 is referred to as the front side. In addition, the side of the left side plate 24 relative to the right side plate 23 is referred to as the left side, and the side of the right side plate 23 relative to the left side plate 24 is referred to as the right side. The direction from the front plate 21 to the rear plate 22 is the depth direction DW. The direction from the bottom plate 25 to the opening 20T is the height direction DH. The direction from the left side plate 24 to the right side plate 23, or the direction from the right side plate 23 to the left side plate 24, is the width direction DL.

[0025] The front plate 21, the rear plate 22, and the bottom plate 25 each have a rectangular plate shape extending in the width direction DL. The front plate 21 and the rear plate 22 face each other in the depth direction DW. The front edge of the bottom plate 25 is the lower edge of the front plate 21, and the rear edge of the bottom plate 25 is the lower edge of the rear plate 22. The right side plate 23 and the left side plate 24 each have a rectangular plate shape and face each other in the width direction DL. The lower edge of the right side plate 23 is connected to the lower edge of the front plate 21, the lower edge of the rear plate 22, and the right edge of the bottom plate 25. The lower edge of the left side plate 24 is also connected to the lower edge of the front plate 21, the lower edge of the rear plate 22, and the left edge of the bottom plate 25.

[0026] 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 depth direction DW. The main front plate 21B forms the front surface of the front plate 21. The front surface of the front plate 21 is the outer surface of the front plate 21. The sub-front plate 21A forms the back surface of the front plate 21. The back surface of the front plate 21 forms the inner surface of the container body 20. The sub-front plate 21A is connected to the main front plate 21B at a front plate end edge 21T, which is the upper edge of the main front plate 21B. The sub-front plate 21A is bent toward the inside of the container body 20 at the front plate end edge 21T relative to the main front plate 21B.

[0027] A central fastening portion 21S, which is a varnished layer for temporarily fastening the wrap film 50, is disposed on the main front panel 21B. The main front panel 21B has a pair of flaps 21F on the left and right. The flaps 21F are positioned closer to the front panel end edge 21T than the center in the height direction DH of the main front panel 21B, so as to sandwich the central fastening portion 21S in the width direction DL. The flap 21F has a front surface of the flap 21F. 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 is disposed on the front surface of the flap 21F.

[0028] The flap 21F is divided by a cutting line 21FC. The cutting line 21FC has a curved shape with both ends near the front plate end edge 21T of the main front plate 21B. The cutting line 21FC has a curved shape that is convex toward the bottom plate 25 side from one end near the front plate end edge 21T of the main front plate 21B to the other end near the front plate end edge 21T. The flap 21F is surrounded by a part of the front plate end edge 21T and the cutting line 21FC. An example of the length of the width direction DL of the flap 21F is 1 / 3 or more and 1 / 2 or less of the length of the width direction DL of the main front plate 21B. The position of the width direction DL of the flap 21F is formed on the left and right sides of the center in the width direction DL of the main front plate 21B. The cutting line 21FC may be a curved shape with both ends at the front plate end edge 21T of the main front plate 21B.

[0029] The main front plate 21B is folded at the front plate end edge 21T relative to the sub-front plate 21A, and thereby a restoring force of the paperboard acts on the front plate 21 near the front plate end edge 21T to return the flap 21F to its original folding state. When the lid 30 is opened to open the opening 20T, the flap 21F rotates to the front side of the container body 20 and rises up from the main front plate 21B. The flap 21F that rises up from the main front plate 21B causes the wrap film 50 that has been pulled out from the opening 20T and cut to rise up from the main front plate 21B.

[0030] The central fastening portion 21S has a plurality of rectangular varnish layers arranged in the width direction DL. The position of the central fastening portion 21S is closer to the front panel end side 21T than the center in the height direction DH in the main front panel 21B, and includes the center in the width 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 panel end side 21T of the front panel 21, to the main front panel 21B.

[0031] The upper part of the sub-front plate 21A is provided with restricting pieces 3R, 4R extending in the depth direction DW. The restricting pieces 3R, 4R are folded at the line LR (see FIG. 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 of the container body 20, the restricting pieces 3R, 4R come into contact with the cylindrical body 50C of the rolled body 50R from the upper front side. In this way, the restricting pieces 3R, 4R prevent the rolled body 50R from jumping out of the container body 20.

[0032] The right side panel 23 includes right flaps 13F, 23F, and 53F (see FIG. 3), with 53F adhered to 13F and 23F. The right side panel 23 includes a lid locking piece 3T extending in the depth direction DW. The lid locking piece 3T is connected to an upper edge 3E of the right side panel 23. The lid locking piece 3T is bent to the right side of the container body 20 at the upper edge 3E (line LT2: see FIG. 3) of the right side panel 23, and protrudes to the right side of the container body 20. The lid locking piece 3T extends in the depth direction DW.

[0033] The left side panel 24 includes left flaps 14F, 24F, and 54F (see FIG. 3), with 54F adhered to 14F and 24F. The left side panel 24 includes a lid locking piece 4T extending in the depth direction DW. The lid locking piece 4T is connected to an upper edge 4E of the left side panel 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 panel 24 (line LT2: see FIG. 3) and protrudes to the left side of the container body 20. The lid locking piece 4T extends in the depth direction DW.

[0034] [Cover 30] Returning to Fig. 1, the lid body 30 includes a cover plate 31, a cover piece 32, a cover right side plate 33, and a cover left side plate 34. The cover plate 31 is rotatably connected to an upper end edge 22T (see Fig. 2) of the rear plate 22. The cover plate 31 rotates relative to the container body 20 about the upper end edge 22T of the rear plate 22 as an axis to open and close the opening 20T of the container body 20.

[0035] The cover piece 32 and the front plate 21 have substantially the same rectangular plate shape. The upper side of the cover piece 32 is the front side of the cover plate 31. The cover piece 32 covers the entire front surface of the front plate 21 in a closed state where the cover body 30 covers the opening 20T. The cover piece 32 has multiple semicircular cutouts 32C below the middle in the height direction DH. The inner surfaces of the cutouts 32C are bonded to the main front plate 21B.

[0036] The cover piece 32 has a perforation line 32M extending across the entire width in the width direction DL at approximately the center in the height direction DH. The perforation line 32M has a V-shape that protrudes downward. The perforation line 32M may have an arc shape that protrudes downward. The right end of the perforation line 32M is an opening end 32N for dividing the cover piece 32 into upper and lower parts along the perforation line 32M.

[0037] When the opening end 32N is pulled forward, the cover piece 32 is cut at the perforation line 32M. Also, the adhesion between the front plate 21 and the cover piece 32 is torn off at the cut portion 32C. As a result, the cover piece 32 is divided into a lower side and an upper side across the entire width of the cover piece 32 in the width direction DL, with the perforation line 32M as the boundary. The upper side of the cover piece 32 defined by the perforation line 32M is the cover front plate 32P. The lower side of the cover piece 32 defined by the perforation line 32M is the cut-out piece 32K.

[0038] The cut piece 32K is cut off from the container body 20 when the wrap film 50 begins to be used. When the cut piece 32K is cut off from the cover piece 32, the entire cutting edge of the cutting blade 35 is exposed from the lower end edge of the lid front plate 32P. Then, the lid body 30 rotates on the upper end edge 22T of the rear plate 22, opening the opening 20T of the container body 20. The wrap film 50 is unwound from the roll 50R, pulled out from between the main front plate 21B and the lid front plate 32P, and cut by the cutting blade 35.

[0039] The lid front plate 32P has a plate shape extending downward from the front edge of the lid plate 31 in the closed state with the lid body 30 covering the opening 20T, and covers the upper part of the main front plate 21B. The width in the height direction DH of the lid front plate 32P is largest at the center in the width direction DL except for both ends in the width direction DL, and the width in the height direction DH decreases as one moves from the center to each end in the width direction DL. A cutting blade 35 is joined to the inner surface of the lid front plate 32P.

[0040] The lid right side plate 33 includes a lid right side plate 33F and a joint piece 323. The lid left side plate 34 includes a lid left side plate 34F and a joint piece 324. The lid right side plate 33F is connected to the lid plate 31 at a short side that is the intersection line between the lid plate 31 and the lid right side plate 33F. The lid left side plate 34F is connected to the lid plate 31 at a short side that is the intersection line between the lid plate 31 and the lid left side plate 34F.

[0041] In the lid right side panel 33 and the lid left side panel 34, the lid side panels 33F, 34F form the outer surface of the lid 30. The joining pieces 323, 324 form the inner surface of the lid 30. The lid right side panel 33 and the lid left side panel 34 cover the upper part of the outer surface of the right side panel 23 and also cover the upper part of the outer surface of the left side panel 24 when the lid 30 is in a closed state with the opening 20T closed.

[0042] The joint piece 323 is located with a gap between it and the short side of the intersection line between the cover plate 31 and the cover right side plate 33F. The joint piece 324 is also located with a gap between it and the short side of the intersection line between the cover plate 31 and the cover left side plate 34F. As a result, the joint pieces 323, 324 are located with a gap between them and the cover plate 31, and form steps 33S, 34S on the inner surfaces of the cover right side plate 33 and the cover left side plate 34. When the cover 30 closes the opening 20T, the above-mentioned cover locking pieces 3T, 4T fit into the steps 33S, 34S and engage with the steps 33S, 34S with a click sound. The cover locking pieces 3T, 4T prevent the cover plate 31 from floating up when closed through engagement with the steps 33S, 34S.

[0043] [Overall configuration of cutting blade 35] The cutting blade 35 has a saw-like shape with cutting edges aligned in the width direction DL. The cutting blade 35 is joined to the front lid plate 32P so that a plurality of cutting edges protrude downward from the front lid plate 32P when the lid body 30 is in a closed state where the opening 20T is covered. The method of joining the cutting blade 35 to the front lid plate 32P is not particularly limited, and for example, the joining is performed by ultrasonic bonding with a sealant layer or adhesive layer interposed between the front lid plate 32P and the cutting blade 35. Also, the joining can be performed by laminating a sealant layer on a resin layer of the blade material constituting the cutting blade 35. Also, the joining can be performed by caulking.

[0044] The material constituting the cutting blade 35 is not particularly limited and may be, for example, a resin or a metal. The cutting blade 35 contains, for example, a resin and an additive, and the rigidity of the cutting blade 35 and the adhesiveness of the cutting blade 35 to the lid front plate 32P can be adjusted depending on the type and amount of the additive.

[0045] The resin constituting the cutting blade 35 is, for example, a polyester resin such as polylactic acid or polyethylene terephthalate, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether ether ketone) resin, or PES (polyether sulfone) resin. The additive constituting the cutting blade 35 is, for example, a resin such as an olefin resin, or an inorganic material such as barium sulfate, calcium carbonate, titanium oxide, silica, or talc. The resin constituting the sealant layer is, for example, a modified polyolefin in which a functional group is introduced into polyolefin to impart adhesiveness.

[0046] The cutting edge of the cutting blade 35 may have a V-shape protruding downward, an arc-like shape protruding downward, or a straight line extending in the width direction DL in a closed state in which the lid 30 covers the opening 20T. When the cutting blade 35 has a V-shape, the cutting edge of the cutting blade 35 includes a central portion in the width direction DL and both ends sandwiching the central portion in the width direction DL, and the central portion protrudes further toward the bottom plate 25 than the both ends in the closed state. The length of the central portion of the cutting blade 35 in the width direction DL is, for example, 1 / 3 of the length of the entire cutting blade 35 in the width direction DL.

[0047] 4, the cutting blade 35 has a plurality of teeth 60 arranged in the width direction DL, and is bonded to the inner surface of the front lid plate 32P so that the plurality of teeth 60 protrude from the front lid plate 32P. The center of the cutting blade 35 in the width direction DL is the center of the cutting blade 35. The cutting blade 35 is configured symmetrically in the width direction DL of the cutting blade 35 with the center of the cutting blade 35 in between.

[0048] The cutting blade 35 may include a central area 35A and a pair of outer areas 35B arranged outside the central area 35A in the width direction DL. The outer area 35B includes a pair of side areas 35S adjacent to the outer side of the central area 35A in the width direction DL, and a pair of end areas 35E arranged outside the pair of side areas 35S in the width direction DL. The end areas 35E include ends of the cutting blade 35 in the width direction DL. The central area 35A, the side areas 35S, and the end areas 35E each include a plurality of teeth 60.

[0049] The central area 35A may be in the range of 5% to 20% of the total width of the cutting blade 35 in the width direction DL. The side area 35S may be in the range of 55% to 85% of the total width of the cutting blade 35 in the width direction DL on the outer side of the central area 35A in the width direction DL. The end area 35E may be in the range of 10% to 25% of the total width of the cutting blade 35 in the width direction DL on the outer side of the side area 35S in the width direction. The cutting blade 35 may be composed of the central area 35A and the side area 35S without including the end area 35E. When the cutting blade 35 does not include the end area 35E, the central area 35A may be in the range of 20% to 30% of the total width of the cutting blade 35 in the width direction DL, and the side area 35S may be in the range of 70% to 80% of the total width of the cutting blade 35 in the width direction DL.

[0050] [Conditions for the first tooth] The cutting blade 35 includes at least one first tooth among the teeth 60. The cutting blade 35 includes one second tooth among the teeth 60, which is adjacent to the outer side of the first tooth in the width direction DL. The cutting blade 35 includes one third tooth among the teeth 60, which is adjacent to the inner side of the first tooth in the width direction DL. The first teeth may account for 50% or more of the total number of all the teeth 60 constituting the cutting blade 35. More preferably, the first teeth account for 80% or more, and most preferably 100% of the total number of all the teeth 60 constituting the cutting blade 35. In this specification, the outer side in the width direction DL means the direction from the center side to the end side in the direction in which the teeth are arranged in the cutting blade 35, and the inner side in the width direction DL means the direction from the end side to the center side in the direction in which the teeth are arranged in the cutting blade 35.

[0051] The first tooth satisfies the following conditions A, B, and C. (Condition A) The first tooth satisfies face width BW / tooth height TH≧2.0. The tooth width BW is the distance between the first tooth bottom TB1 and the second tooth bottom TB2 in the width direction DL. The first tooth bottom TB1 is the lowest position of the tooth bottom at the intersection of the outer hypotenuse SL1 of the first tooth in the width direction DL and the inner hypotenuse SR2 of the second tooth in the width direction DL. The second tooth bottom TB2 is the lowest position of the tooth bottom at the intersection of the inner hypotenuse SR1 of the first tooth in the width direction DL and the outer hypotenuse SL3 of the third tooth in the width direction DL. The straight line connecting the first tooth bottom TB1 and the second tooth bottom TB2 is the tooth bottom line BL. The tooth height TH is the distance from the tip of the first tooth to the tooth bottom line BL on a perpendicular line drawn from the tip of the first tooth to the tooth bottom line BL.

[0052] (Condition B) The first tooth satisfies the radius of curvature R ≧ 0.5 mm. The outer hypotenuse SL1 of the first tooth in the width direction DL and the inner hypotenuse SR2 of the second tooth in the width direction DL are connected by a circular arc. The inner hypotenuse SR1 of the first tooth in the width direction DL and the outer hypotenuse SL3 of the third tooth in the width direction DL are connected by another circular arc. The radius of curvature R of the first tooth is the radius of curvature R of the circular arc following the hypotenuse SR1 and the radius of curvature R of the circular arc following SL1. In addition, when one hypotenuse SL1 is approximated by a joining line of two or more curves, the circular arc determining the radius of curvature R of the first tooth follows a curve including the first tooth bottom TB1 among the two or more curves. In the case where one hypotenuse SR1 is approximated by a joining line of two or more curves, the circular arc determining the radius of curvature R of the first tooth follows a curve including the second tooth bottom TB2 among the two or more curves.

[0053] (Condition C) The first tooth has a tooth area S≦0.6 mm 2 Meet the following. The area bounded by the outer hypotenuse SL1 of the first tooth in the width direction DL, the inner hypotenuse SR1 of the first tooth in the width direction DL, and the tooth base line BL of the first tooth is the tooth area S of the first tooth.

[0054] [First tooth] An example of the first tooth will be described below by taking as an example a V-shaped cutting blade 35 having a central area 35A, a side area 35S, and an end area 35E. Figures 5, 6, and 7 show a plurality of teeth 60 constituting the central area 35A, the side area 35S, and the end area 35E, respectively. Figures 8 and 9 show an enlarged view of the plurality of teeth 60 constituting the central area 35A and the side area 35S, respectively.

[0055] As shown in Figs. 5, 6, and 7, the teeth 60 constituting the cutting blade 35 include at least one first tooth (611, 641, 651), one second tooth (622, 642, 662) adjacent to the outer side of the first tooth in the width direction DL, and one third tooth (623, 643, 663) adjacent to the inner side of the first tooth in the width direction DL. The first tooth has a hypotenuse SL1 extending from the tip of the tooth to the outer side in the width direction DL. The hypotenuse SL1 is connected to a hypotenuse SR2 extending from the tip of the tooth (622, 642, 662) adjacent to the outer side of the tooth in the width direction DL to the inner side in the width direction DL. The first tooth also has a hypotenuse SR1 extending from the tip of the tooth to the inner side in the width direction DL. The hypotenuse SR1 is connected to a hypotenuse SL3 extending outward in the width direction DL from the tip of the tooth (623, 643, 663) adjacent to the inner side of the tooth in the width direction DL, and has a first tooth bottom TB1 and a second tooth bottom TB2.

[0056] Of the two oblique sides SR1, SL1 that the first tooth has, the oblique side SR1 is located on the inside in the width direction DL of the cutting blade 35, and the oblique side SL1 is located on the outside in the width direction DL of the cutting blade 35.

[0057] The lowest point of the tooth bottom at the intersection of the outer hypotenuse SL1 in the width direction DL of the first tooth (611, 641, 651) and the inner hypotenuse SR2 in the width direction DL of a tooth (622, 642, 662) adjacent to the outer side of the first tooth in the width direction DL is the first tooth bottom TB1 of the first tooth (611, 641, 651).

[0058] The lowest point of the intersection between the inner hypotenuse SR1 in the width direction DL of the first tooth (611, 641, 651) and the outer hypotenuse SL3 in the width direction DL of a tooth (623, 643, 663) adjacent to the inner side of the first tooth in the width direction DL is the second tooth bottom TB2 of the first tooth (611, 641, 651).

[0059] In the first tooth (611, 641, 651), the straight line connecting the first tooth bottom TB1 and the second tooth bottom TB2 is the bottom line BL. In the first tooth (611, 641, 651), the distance in the width direction DL between the first tooth bottom TB1 and the second tooth bottom TB2 is the tooth width BW of the first tooth (611, 641, 651).

[0060] For the first tooth (611, 641, 651), the tip of the tooth is the tooth tip of the tooth. For the first tooth (611, 641, 651), the distance from the tooth tip to the tooth base line BL of the tooth on a perpendicular line drawn from the tooth tip to the tooth base line BL of the tooth is the tooth height TH of the tooth. A straight line connecting the tips of two or more teeth 60 among all the teeth 60 constituting the cutting blade 35 is the tooth tip line TL.

[0061] The hypotenuse SR1 of the first tooth (611, 641, 651) is connected to the hypotenuse SL3 of the third tooth (623, 643, 663) by a circular arc. The hypotenuse SL1 of the first tooth (611, 641, 651) is connected to the hypotenuse SR2 of the second tooth (622, 642, 662) by a circular arc. The radius of curvature R of the circular arc connecting the hypotenuse SL3 to the hypotenuse SR1 and the radius of curvature R of the circular arc connecting the hypotenuse SL2 to the hypotenuse SL1 are the radius of curvature R of the first tooth (611, 641, 651).

[0062] [Central Area 35A] 5, the central area 35A includes a plurality of teeth 60 having different tooth heights TH. The plurality of teeth 60 constituting the central area 35A includes a plurality of central large teeth 61, a plurality of central medium teeth 62, and a central small tooth 63.

[0063] The central large tooth 61 has the largest tooth height TH in the central area 35A. The central medium tooth 62 has a tooth height TH smaller than that of the central large tooth 61 and larger than that of the central small tooth 63. The central small tooth 63 has the smallest tooth height TH in the central area 35A. In the central area 35A, the central large tooth 61, the central medium tooth 62, and the central small tooth 63 are arranged in the width direction DL such that the tooth heights TH of three adjacent teeth 60 in the width direction DL do not match each other.

[0064] The central large tooth 61 has the largest tooth width BW in the central area 35A. The central large tooth 61 has the highest mechanical strength in the central area 35A. The central medium tooth 62 has a tooth width BW smaller than that of the central large tooth 61 and larger than that of the central small tooth 63. The central small tooth 63 has the smallest tooth width BW in the central area 35A.

[0065] One central large tooth 61 is disposed at the center of the cutting blade 35. The other central large teeth 61 are disposed outward from the center of the cutting blade 35 in the width direction DL. The multiple central medium teeth 62 are disposed throughout the central area 35A. Some of the multiple central medium teeth 62 are sandwiched between two central large teeth 61 in the width direction DL. The other parts of the multiple central medium teeth 62 are disposed near the side areas 35S within the central area 35A. The central small tooth 63 is sandwiched between the two central medium teeth 62 in the width direction DL.

[0066] The central large tooth 61, the central medium tooth 62, and the central small tooth 63 each have a first tooth root TB1 and a second tooth root TB2 on a single tooth root line BL. The central large tooth 61, the central medium tooth 62, and the central small tooth 63 each have a tooth tip on a separate tooth tip line TL. The tooth root line BL is parallel to each tooth tip line TL.

[0067] In the central area 35A, only the central large tooth 61 may be the first tooth, only the central medium tooth 62 may be the first tooth, or only the central small tooth 63 may be the first tooth. In the central area 35A, the central large tooth 61 and the central medium tooth 62 may be the first tooth, the central large tooth 61 and the central small tooth 63 may be the first tooth, or the central medium tooth 62 and the central small tooth 63 may be the first tooth.

[0068] 5, when the central large tooth 61 is the first tooth, one central central tooth 62 adjacent to the outside in the width direction DL of the first central large tooth 611, which is one of the central large teeth 61, is the second tooth, that is, the second central central tooth 622. One central central tooth 62 adjacent to the inside in the width direction DL of the first central large tooth 611 is the third central central tooth 623, which is the third tooth.

[0069] In the example shown in FIG. 8, when the central large tooth 61 is the first tooth, the hypotenuse SL1 of the first central large tooth 611 is connected to the hypotenuse SR2 of the second central medium tooth 622 by a circular arc. The hypotenuse SR1 of the first central large tooth 611 is connected to the hypotenuse SL3 of the third central medium tooth 623 by another circular arc. The hypotenuse SL1 is connected to the hypotenuse SR2 by a circular arc, meaning that the hypotenuse SL1 is not connected to the hypotenuse SR2 via a bending point, but is connected by a rounded smooth curve. The hypotenuse SL1 and the hypotenuse SR2 may be connected by a circular arc without a bending point, or may be connected by an arc other than a circular arc, or may be connected by a series of multiple arcs. The hypotenuse SR1 is connected to the hypotenuse SL3 by a circular arc, meaning that the hypotenuse SR1 is not connected to the hypotenuse SL3 via a bending point, but is connected by a rounded smooth curve. In addition, the hypotenuse SR1 and the hypotenuse SL3 may be connected by a circular arc without having a bending point, may be connected by an arc other than a circular arc, or may be connected by a series of multiple arcs.

[0070] The hypotenuses constituting the first, second and third teeth may be composed of one arc, multiple arcs, or a combination of arcs and straight lines. The radius of curvature R of the arc connecting the hypotenuse SL1 to the hypotenuse SR2 and the radius of curvature R of the arc connecting the hypotenuse SR1 to the hypotenuse SL3 are the radius of curvature R of the first tooth in the central area 35A.

[0071] When the central large tooth 61 is the first tooth, in the example shown in FIG. 5, the area bounded by the hypotenuse SR1, the hypotenuse SL1, and the base line BL of the first central large tooth 611 is the tooth area S of the first tooth.

[0072] When only the central large tooth 61 is the first tooth, the hypotenuse SR1 of the first central medium tooth 621 may be connected to the hypotenuse SL3 of the central large tooth 61 via a bending point or via a straight line. The hypotenuse SL1 of the first central medium tooth 621 may also be connected to the hypotenuse SR2 of the central large tooth 61 via a bending point or via a straight line.

[0073] [Side area 35E] As shown in Fig. 6, the side area 35S includes a plurality of teeth 60 having the same tooth height TH. The plurality of teeth 60 constituting the side area 35S include outwardly inclined teeth 64 whose tips face outward in the width direction DL. The plurality of outwardly inclined teeth 64 each have a first tooth root TB1 and a second tooth root TB2 on a single tooth root line BL. The plurality of outwardly inclined teeth 64 each have a tooth tip on a single tooth tip line TL. The tooth root line BL of the outwardly inclined teeth 64 is parallel to each tooth tip line TL.

[0074] The outward teeth 64 have a tooth height TH smaller than that of the large central teeth 61. The outward teeth 64 have a tooth height TH larger than that of the small central teeth 63. The outward teeth 64 have a tooth width BW smaller than that of the large central teeth 61. The outward teeth 64 have a tooth width BW larger than that of the small central teeth 63.

[0075] An outer oblique side SL1 in the width direction DL of the outward tooth 64 is shorter than an inner oblique side SR1 in the width direction DL of the outward tooth 64. The position of the tip of the outward tooth 64 is biased toward the first bottom TB1 in the width direction DL.

[0076] In the side area 35S, the outward tooth 64 may be the first tooth. When the outward tooth 64 is the first tooth, in the example shown in Fig. 6, one outward tooth 64 adjacent to the outside of a first outward tooth 641, which is one of the outward teeth 64, in the width direction DL is a second outward tooth 642, which is the second tooth. Also, one outward tooth 64 adjacent to the inside of the first outward tooth 641 in the width direction DL is a third outward tooth 643, which is the third tooth.

[0077] In the example shown in FIG. 9, when the outward tooth 64 is the first tooth, the hypotenuse SL1 of the first outward tooth 641 is connected to the hypotenuse SR2 of the second outward tooth 642 by a circular arc. Also, the hypotenuse SR1 of the first outward tooth 641 is connected to the hypotenuse SL3 of the third outward tooth 643 by another circular arc. The hypotenuse SL1 is connected to the hypotenuse SR2 by a circular arc, meaning that the hypotenuse SL1 is not connected to the hypotenuse SR2 through a bending point, but is connected by a rounded smooth curve. The circular arc connecting the hypotenuse SL1 to the hypotenuse SR2 follows more than half of the short hypotenuse SL1 and follows less than half of the long hypotenuse SR2. Also, the hypotenuse SL1 and the hypotenuse SR2 may be connected by a circular arc without a bending point, may be connected by an arc other than a circular arc, or may be connected by a series of multiple arcs. The hypotenuse SR1 is connected to the hypotenuse SL3 by a circular arc, which means that the hypotenuse SR1 is connected to the hypotenuse SL3 not through a bending point but through a rounded smooth curve. The circular arc connecting the hypotenuse SR1 to the hypotenuse SL3 follows less than half of the long hypotenuse SR1 and more than half of the short hypotenuse SL3. The hypotenuse SL3 and the hypotenuse SR1 may be connected by a circular arc without a bending point, may be connected by an arc other than a circular arc, or may be connected by a series of multiple arcs. The hypotenuses constituting the first tooth, the second tooth, and the third tooth may be composed of one circular arc, may be multiple circular arcs, or may be a combination of a circular arc and a straight line. The radius of curvature R of the circular arc connecting the hypotenuse SR2 to the hypotenuse SL1 and the radius of curvature R of the circular arc connecting the hypotenuse SL3 to the hypotenuse SR1 are the radius of curvature R of the first tooth in the side area 35S.

[0078] When the outward tooth 64 is the first tooth, in the example shown in FIG. 6, the area bounded by the hypotenuse SR1, the hypotenuse SL1, and the base line BL of the first outward tooth 641 is the tooth area S of the first tooth.

[0079] In addition, when some of all the outward teeth 64 are not the first teeth, the hypotenuse SR1 of the outward teeth 64 may be connected to the hypotenuse SL3 via a bending point or via a straight line. When some of all the outward teeth 64 are not the first teeth, the hypotenuse SL1 of the outward teeth 64 may also be connected to the hypotenuse SR2 via a bending point or via a straight line.

[0080] [End Area 35E] 7, the end area 35E includes a plurality of teeth 60 having different tooth heights TH. The plurality of teeth 60 constituting the end area 35E includes a plurality of large end teeth 65 and a plurality of small end teeth 66.

[0081] The end large teeth 65 have the largest tooth height TH in the end area 35E. The end small teeth 66 have a smaller tooth height TH than the end large teeth 65. In the end area 35E, the end large teeth 65 and end small teeth 66 are arranged alternately in the width direction DL so that the tooth heights TH of consecutive teeth 60 in the width direction DL do not match each other. The end large teeth 65 are sandwiched between two end small teeth 66 in the width direction DL. The end small teeth 66 are sandwiched between two end large teeth 65 in the width direction DL.

[0082] The large end teeth 65 have the largest tooth width BW in the end area 35 E. The large end teeth 65 have the highest mechanical strength in the end area 35 E. The small end teeth 66 have a smaller tooth width BW than the large end teeth 65.

[0083] The large end tooth 65 and the small end tooth 66 have a first tooth root TB1 and a second tooth root TB2 on a single tooth root line BL. The large end tooth 65 and the small end tooth 66 have tips on separate tooth tip lines TL. The tooth root line BL is parallel to each tooth tip line TL.

[0084] In the end area 35E, only the large end tooth 65 may be the first tooth, or only the small end tooth 66 may be the first tooth. In the end area 35E, both the large end tooth 65 and the small end tooth 66 may be the first tooth.

[0085] 7, when the end large tooth 65 is the first tooth, one end small tooth 66 adjacent to the outer side in the width direction DL of a first end large tooth 651, which is one of the end large teeth 65, is the second tooth, which is a second end small tooth 662. One end small tooth 66 adjacent to the inner side in the width direction DL of the first end large tooth 651 is the third end small tooth 663, which is the third tooth.

[0086] When the end large tooth 65 is the first tooth, the hypotenuse SL1 of the first end large tooth 651 is connected to the hypotenuse SR2 of the second end small tooth 662 by a circular arc. Also, the hypotenuse SR1 of the first end large tooth 651 is connected to the hypotenuse SL3 of the third end small tooth 663 by another circular arc. The hypotenuse SL1 is connected to the hypotenuse SR2 by a circular arc means that the hypotenuse SL1 is not connected to the hypotenuse SR2 via a bending point, but is connected by a rounded smooth curve. Also, the hypotenuse SL1 and the hypotenuse SR2 may be connected by a circular arc without having a bending point, or may be connected by an arc other than a circular arc, or may be connected by a series of multiple arcs. The hypotenuse SR1 is connected to the hypotenuse SL3 by a circular arc means that the hypotenuse SR1 is not connected to the hypotenuse SL3 via a bending point, but is connected by a rounded smooth curve. In addition, the hypotenuse SR1 and the hypotenuse SL3 may not have a bending point and may be connected by a circular arc, may be connected by an arc other than a circular arc, or may be connected by a series of multiple arcs. The radius of curvature R of the circular arc connecting the hypotenuse SL1 to the hypotenuse SR2 and the radius of curvature R of the circular arc connecting the hypotenuse SR1 to the hypotenuse SL3 are the radius of curvature R of the first tooth in the end area 35E.

[0087] When the end large tooth 65 is the first tooth, in the example shown in Figure 7, the area bounded by the hypotenuse SR1, the hypotenuse SL1, and the base line BL of the first end large tooth 651 is the tooth area S of the first tooth.

[0088] [Cutting method] One way in which the wrap film 50 is cut is a center cut. Another way in which the wrap film 50 is cut is an edge cut. A center cut begins cutting the wrap film 50 from the center of the wrap film 50 in the width direction DL. A center cut pierces the wrap film 50 with the cutting blade 35 from the tip of the teeth in the center area 35A of the cutting blade 35. An edge cut begins cutting the wrap film 50 from the edge of the wrap film 50 in the width direction DL. An edge cut pierces the wrap film 50 with the tip of the teeth in the edge area 35E of the cutting blade 35.

[0089] In the center cut, by making the tooth heights TH of the multiple teeth 60 that are consecutive in the width direction DL not coincident in the central area 35A where cutting begins, the number of teeth 60 that are simultaneously pierced into the wrap film 50 is made smaller than the number of all teeth 60 in the central area 35A. This distributes the stress used to cut the wrap film 50, making it easier to pierce the tips of the teeth into the wrap film 50.

[0090] The central medium teeth 62 are inserted into the wrap film 50 following the central large teeth 61, further cutting the wrap film 50. The central medium teeth 62 sandwiched between the two central large teeth 61 prevent the wrap film 50 from getting caught between the central large teeth 61, making it easier to cut the wrap film 50. The central medium teeth 62 and central small teeth 63 located near the side areas 35S smoothly transition the cutting of the wrap film 50 from the central area 35A to the side areas 35S.

[0091] The side areas 35S advance the cutting of the wrap film 50, which began in the central area 35A, to the ends in the width direction DL of the wrap film 50. The central cut involves piercing the teeth of the end areas 35E into the wrap film 50 after the central area 35A and side areas 35S. By not matching the tooth heights TH of the multiple teeth 60 that are consecutive in the width direction DL in the end areas 35E, the number of teeth 60 that are simultaneously pierced into the wrap film 50 is reduced compared to the total number of teeth 60 in the end areas 35E. This distributes the stress used to cut the wrap film 50, making it easier to pierce the teeth into the wrap film 50.

[0092] In the edge cut, by not matching the tooth heights TH of multiple teeth 60 that are continuous in the width direction DL in edge area 35E where cutting begins, the number of teeth 60 that are simultaneously pierced into the wrap film 50 is made smaller than the number of all teeth 60 in edge area 35E. This distributes the stress used to cut the wrap film 50, making it easier to pierce the tips of the teeth into the wrap film 50.

[0093] The small end teeth 66 are inserted into the wrap film 50 following the large end teeth 65, further cutting the wrap film 50. The small end teeth 66 sandwiched between the two large end teeth 65 prevent the wrap film 50 from getting caught between the large end teeth 65, making it easier to cut the wrap film 50. The small end teeth 66 located near the side area 35S smoothly transition the cutting of the wrap film 50 from the end area 35E to the side area 35S.

[0094] The side areas 35S advance the cutting of the wrap film 50, which began in the edge areas 35E, to the center in the width direction DL of the wrap film 50. The edge cut is performed after the edge areas 35E and side areas 35S, by piercing the tips of the teeth in the central area 35A into the wrap film 50. By not matching the tooth heights TH of the multiple teeth 60 that are consecutive in the width direction DL in the central area 35A, the number of teeth 60 that are simultaneously pierced into the wrap film 50 is reduced compared to the total number of teeth 60 in the central area 35A. This distributes the stress used to cut the wrap film 50 in the central area 35A, making it easier to pierce the tips of the teeth into the wrap film 50.

[0095] [Wrap Film 50] The wrap film 50 may satisfy the following condition D or condition E. (Condition D) The average value of the tear strength of the wrap film in the machine direction and the tear strength of the wrap film in the width direction is 25 mN or more.

[0096] (Condition E) Surface adhesion of wrap film (N / 25cm 2 ) to the tooth area S of the first tooth (mm 2 ) is the adhesion index of the wrap film, the adhesion index is 9.0 or less. The tear strength of the wrap film 50 is the resistance to tearing of the wrap film 50. The tear strength of the wrap film 50 is obtained by the Elmendorf measurement method according to JIS K 7128-2:1998. The tear strength of the wrap film 50 is the average value of the tear strength in the machine direction of the wrap film 50 and the tear strength in the width direction of the wrap film 50. The tear strength in the machine direction of the wrap film 50 is the tear strength in the MD direction of the wrap film 50. The tear strength in the width direction DL of the wrap film 50 is the tear strength in the TD direction of the wrap film 50. The MD direction is the machine direction of the wrap film 50 during the manufacturing process, and is the direction in which the wrap film 50 is pulled out. The TD direction is the width direction DL of the wrap film 50. The tear strength of the wrap film 50 is the average value of the tear strength in the machine direction of the wrap film 50 and the tear strength in the width direction DL of the wrap film 50.

[0097] The wrap film 50 may be a film made of any one of the group consisting of polyvinylidene chloride, polyvinyl chloride, polyethylene, and polymethylpentene. The wrap film 50 may be a multi-layer film made of a combination of films made of two or more of the group consisting of polyvinylidene chloride, polyvinyl chloride, polyethylene, and polymethylpentene. The wrap film 50 may be a film made of a material other than polyvinylidene chloride, polyvinyl chloride, polyethylene, and polymethylpentene. The wrap film 50 is preferably made mainly of vinylidene chloride resin, which is particularly prone to tearing. The vinylidene chloride resin may contain vinylidene chloride units. The wrap film 50 made mainly of vinylidene chloride resin has a remarkable effect of suppressing vertical tearing when the wrap film 50 is restored. The thickness of the wrap film 50 is not particularly limited, and may be 10 μm, 9 μm or less, or 8 μm or less.

[0098] The surface adhesion of the wrap film 50 is the adhesion between the wrap films 50. The surface adhesion of the wrap film 50 is a value measured using a tensile tester. The two cylindrical aluminum jigs used in the tensile tester are 25 cm 2 and a mass of 300 g. The surface adhesion is measured by first fixing a wrap film 50 in a taut state so as to avoid wrinkles to the bottom surface of each jig. Next, the wrap films 50 fixed to the two jigs are brought into contact with each other in the vertical direction to pressure-bond the wrap films 50 together. Then, a tensile tester is used to pull the two jigs in a direction in which the bottom surfaces of the two jigs move away from each other. The maximum load (unit: N) required to pull the jigs apart at this time can be regarded as the surface adhesion value of the test piece.

[0099] [Vertical split in recovery efforts] 10, the cutting blade 35 forms a cut end 50T in the wrap film 50 by cutting the wrap film 50. The tip of the wrap film 50, including the cut end 50T that has entered the container body 20, is attached to the outermost surface of the rolled body 50R. In the recovery operation of pulling out the tip of the wrap film 50 from inside the container body 20, the tip of the wrap film 50 attached to the outermost surface of the rolled body 50R is first peeled off from the outermost surface of the rolled body 50R.

[0100] The cut edge 50T of the wrap film 50 has a sawtooth shape composed of multiple oblique sides 56. Two adjacent oblique sides 56 form the valley portion of the cut edge 50T or the peak portion of the cut edge 50T. Each oblique side 56 is a portion cut along the oblique side of the tooth 60 from the tip of the tooth inserted into the wrap film 50. The valley portion of the cut edge 50T of the wrap film 50 may have a notch 56B at the portion where the two adjacent oblique sides 56 are connected. The notch 56B is formed as follows when the wrap film 50 is cut.

[0101] First, the tooth tips of the cutting blade 35 are inserted into the wrap film 50, and the oblique side 56 begins to be formed in the wrap film 50 from the portion where the tooth tips are inserted. This forms the apex of the crest of the cut end 50T. The oblique side 56 formed from two adjacent tooth tips is formed toward, for example, one tooth bottom TB1 common to the two tooth tips. Next, the two oblique sides 56 formed toward one tooth bottom TB1 join together near the tooth bottom TB1 at different times. At this time, one oblique side 56 that reaches the vicinity of one tooth bottom TB1 first can be cut larger than the other oblique side 56 that reaches the vicinity of one tooth bottom TB1 later. This forms a cutout portion 56B in one oblique side 56 so as to extend further from the portion where the two oblique sides 56 are joined.

[0102] When the recovery operation of rewinding is started, the tip of the wrap film 50 including the cut end 50T starts to be peeled off from one end in the width direction DL. The peeled portion 57, which is a part of the cut end 50T peeled off by the recovery operation, applies stress to the remaining part of the cut end 50T attached to the outermost surface of the roll 50R in a direction to peel off the cut end 50T. The stress to peel off the cut end 50T from one end of the cut end 50T is applied as a tear stress in the circumferential direction of the roll 50R at the valley of the cut end 50T. When the tear stress is applied to the valley of the cut end 50T, vertical tearing is likely to occur from the valley of the cut end 50T. In particular, when the notch 56B is present in the valley of the cut end 50T, the notch 56B becomes the starting part of the vertical tear, so that vertical tearing is likely to occur from the valley of the cut end 50T.

[0103] Here, the first tooth satisfies condition A, that is, tooth width BW / tooth height TH≧2.0. A first tooth that satisfies condition A, compared to a tooth 60 that does not satisfy condition A, forms a cutting mark in a shape in which the oblique side SR1 is inclined toward the tooth base line BL, and forms a cutting mark in a shape in which the oblique side SL1 is inclined toward the tooth base line BL, in the cutting mark formed on the cut edge 50T of the wrap film 50. A first tooth that satisfies condition A, compared to a tooth 60 that does not satisfy condition A, makes the extension direction of the oblique side 56 that follows the oblique sides SR1, SL1 closer to the extension direction of the tooth base line BL, and therefore closer to the width direction DL, in the cutting mark formed on the cut edge 50T of the wrap film 50. As a result, a first tooth that satisfies condition A makes the acting direction of the tear stress in the valley of the cut edge 50T closer to the width direction DL, compared to a tooth 60 that does not satisfy condition A. Bringing the direction of action of the tear stress closer to the width direction DL prevents the tear stress from acting in the circumferential direction of the roll 50R, in other words, prevents vertical tearing during recovery work, and facilitates peeling off of the leading end of the wrap film 50 including the cut end 50T. The value of the tooth width BW / tooth height TH is preferably 2.0 or more. It is more preferably 2.0 to 3.0, and most preferably 2.1 to 2.8. If the tooth width BW / tooth height TH value is less than 2.0, the effect of preventing vertical tearing during recovery is low, and if it exceeds 3.0, the cutting ability is likely to deteriorate. If the tooth width BW / tooth height TH value is 2.1 to 2.8, it is expected that the effect of preventing vertical tearing during recovery will be maintained while maintaining good cutting ability.

[0104] In addition, the first tooth satisfies condition B that the radius of curvature R is 0.5 mm or more. The first tooth satisfying condition B, together with the first tooth satisfying condition A, brings the shape of the valley formed on the oblique sides SR1 and SL3 and the shape of the valley formed on the oblique sides SL1 and SR2 closer to a straight shape following the tooth bottom line BL. In addition, the first tooth satisfying condition B suppresses the formation of the notch 56B in the flow direction in the valley of the cut end 50T. As a result, the first tooth satisfying conditions A and B brings the action direction of the tear stress applied to the valley of the cut end 50T closer to the width direction DL than the tooth 60 not satisfying conditions A and B. In addition, the first tooth satisfying condition B suppresses the action of the tear stress on the notch 56B than the tooth 60 not satisfying condition B. In addition, the first tooth satisfying conditions A and B further suppresses the occurrence of vertical cracks during recovery work.

[0105] The curvature radius R is preferably 0.5 mm or more. The curvature radius R is more preferably 0.5 mm or more and 1.0 mm or less, and most preferably 0.5 mm or more and 0.8 mm or less. If the curvature radius R is less than 0.5 mm, vertical tearing is likely to occur during dissemination work, and if it exceeds 1.0 mm, cutting performance is likely to deteriorate. If the curvature radius R is 0.5 mm or more and 0.8 mm or less, a blade shape with good cutting performance can be obtained while preventing vertical tearing during recovery work.

[0106] 11, the smooth curved shape is a series of multiple arcs, and is one of the arcs connecting the hypotenuse of the first tooth 61 (611) to the hypotenuse of the second tooth 62 (622). In this case, the radius of curvature R is the radius of the circle that has the most points circumscribing the arc among the hypotenuse of the first tooth 61 (611), the hypotenuse of the second tooth 62 (622), and the circles circumscribing the arc. The shape of the cut end 50T of the wrap film 50 cut by the cutting blade 35 is formed to roughly follow the general shape of the hypotenuse and the arc.

[0107] In addition, the first tooth meets condition C, that is, the tooth area S≦0.6 mm 2 Meet the following. The blade mark formed at the tip of the wrap film 50 is formed along the shape of the cutting blade 35. Therefore, the first tooth satisfying condition C reduces the area of ​​the peaks in the blade mark formed at the tip of the wrap film 50 compared to the tooth 60 that does not satisfy condition C. The larger the area of ​​the peaks in the blade mark at the tip of the wrap film 50, the greater the stress required to peel off the peaks in the recovery work of peeling off the peaks. That is, in the recovery work of peeling off the peaks, the tear stress applied to the valleys adjacent to the peaks is increased. On the other hand, the first tooth that satisfies condition C reduces the tear stress applied to the valleys compared to the tooth 60 that does not satisfy condition C. Therefore, the first tooth that satisfies condition C reduces vertical tearing caused by the increased tear stress applied to the valleys. In addition, the first tooth that satisfies condition C, combined with the fact that the first tooth satisfies conditions A and B, reduces the height difference between the four oblique sides 56 in the blade mark formed by the four oblique sides SR1, SL1, SR2, and SL3, and brings them closer to a single straight line. As a result, the first tooth satisfying conditions A, B, and C brings the direction of the tear stress applied to the valley of the cut end 50T closer to the width direction DL and suppresses the tear stress itself, compared to the tooth 60 that does not satisfy conditions A, B, and C. And the first tooth satisfying conditions A, B, and C further suppresses the occurrence of vertical cracks during the restoration work.

[0108] The tooth area S is 0.6 mm 2 The tooth area S is preferably 0.5 mm 2 Less than 0.4 mm is more preferable. 2 The following is most preferable. By reducing the tooth area S, the tearing stress applied to the valley portion during recovery can be suppressed, and the occurrence of vertical cracks can be effectively suppressed.

[0109] Additionally, the wrap film 50 may satisfy condition D, which is tear strength ≧25 mN. When the wrap film 50 satisfies condition D, the tear strength of the wrap film 50 in the machine direction and the tear strength of the wrap film 50 in the width direction DL are increased to a predetermined range, compared to a wrap film 50 that does not satisfy condition D. As described above, the acting direction of the tear stress in the valley portion of the cutting blade 35 is brought closer to the width direction DL by the cutting blade 35 being provided with the first teeth. Meanwhile, while the acting direction of the tear stress in the valley portion of the cutting blade 35 is brought closer to the width direction DL, it has not only a component in the width direction DL but also a component in the machine direction. For this reason, from the viewpoint of suppressing vertical tearing of the wrap film 50, the average value of the tear strength of the wrap film 50 in the machine direction and the tear strength of the wrap film 50 in the width direction DL is important.

[0110] If the wrap film 50 satisfies condition D, not only the tear strength in the width direction DL but also the tear strength in the machine direction is increased, so that vertical tears during recovery work can be suppressed with high certainty. The tear strength of the wrap film 50 may be 25 mN or more, 26 mN or more, or 28 mN or more.

[0111] When the tear strength of the wrap film 50 is 25 mN or more, vertical tearing of the wrap film 50 is easily suppressed. When the raw material of the wrap film 50 is polyvinylidene chloride, the tear strength of the wrap film 50 having a thickness of 9 μm is, for example, 25 mN or more and 28 mN or less. When the raw material of the wrap film 50 is polyvinylidene chloride, the tear strength of the wrap film 50 having a thickness of 10 μm is, for example, 28 mN or more and 30 mN or less.

[0112] In addition, as condition E, the surface adhesion strength of the wrap film (N / 25cm 2 ) to the tooth area S of the first tooth (mm 2 The adhesion index of the wrap film may be set to 9.0 or less when the adhesion index is a value obtained by multiplying the adhesion force between the wrap films 50 and the tooth area S (mm 2 ) and indicates how easy it is to peel off the wrap film 50 during recovery work.

[0113] As described above, the larger the area of ​​the peaks at the tip of the wrap film 50, the greater the stress required to peel off the peaks in the recovery operation. 2 ) and the tooth area of ​​the first tooth S (mm 2 ) satisfies condition E, the tear stress applied to the valley portion is suppressed more effectively than in condition C, compared to when condition E is not satisfied. Therefore, even if a notch 56B is formed at the cut end 50T, the longitudinal tear is suppressed from progressing in the flow direction from the notch 56B, and the leading end of the wrap film 50 can be peeled off from the surface of the roll 50 before the longitudinal tear progresses, and the wrap film 50 can be restored to normal. The wrap film 50 and cutting blade 35 that satisfy condition E further suppress longitudinal tearing caused by increased tear stress applied to the valley portion, and the leading end of the wrap film 50 can be easily restored. The adhesion index is preferably 9.0 or less. The adhesion index is more preferably 7.0 or less, and most preferably 5.0 or less. By reducing the adhesion index, the tear stress applied to the valley portion during restoration can be suppressed, effectively suppressing the occurrence of longitudinal tearing, and making it easier to restore the leading end of the wrap film 50.

[0114] [Test example] Test examples for illustrating the effects of the above-described embodiment are described below. First, the method for measuring the tear strength at the valleys of the wrap film 50 in each test example is described, then the method for evaluating the recovery rate in each test example is described, and finally the configuration of each test example and the evaluation results are described.

[0115] [Method for measuring valley crack strength of wrap film 50] 11 shows a method for measuring the valley tear strength of wrap film 50 at cut edge 50T. The method for measuring the valley tear strength includes (i) forming cut edge 50T, (ii) attaching end tape TE and central tape TC to cut edge 50T, and (iii) pulling away central tape TC.

[0116] (i) Formation of cut end 50T First, the vicinity of the center in the width direction DL of the storage box 10 in which the roll 50R is stored is grasped, and the wrap film 50 is pulled out from the container body 20 with the lid body 30 opened, and the lid body 30 is closed. Next, the wrap film 50 sandwiched between the front surface of the front plate 21 and the front lid plate 32P is cut by the cutting blade 35, thereby forming a cut end 50T in the wrap film 50. At this time, the front lid plate 32P is pressed against the front surface of the front plate 21 via the wrap film 50, and the position of the wrap film 50 relative to the cutting blade 35 is fixed. Then, the storage box 10 is rotated around a rotation axis extending in the width direction DL. The wrap film 50 may be cut by a center cut using a V-shaped cutting blade 35, an end cut using a V-shaped cutting blade 35, or an end cut using a straight cutting blade 35. The cutting method of the wrap film 50 is recommended for each storage box 10 in accordance with the shape of the cutting blade 35 so that the wrap film 50 can be cut smoothly, and the cut end 50T is formed by the recommended cutting method. The cut end 50T alternates between the peaks 50T1 and the valleys 50T2 in the width direction DL. One peak 50T1 includes two oblique sides connected to the width direction DL. One valley 50T2 includes one oblique side of one peak 50T1 and one oblique side of the other peak 50T1 connected to the one oblique side. The cut end 50T is not limited to the shape of FIG. 11. For example, the two oblique sides constituting the peak 50T1 may be curved, or one may be straight and the other may be curved. In addition, the peak 50T1 may have a flat portion at the top, or the valley 50T2 may have a flat portion. In addition, each may be a combination of them.

[0117] (ii) Attachment of tapes TE and TC The roll 50R with the cut end 50T formed is removed from the roll storage box 10, and the wrap film 50 is rewound onto the roll 50R so that no wrinkles are formed in the tip 50S1 of the wrap film 50 including the cut end 50T, and the cut end 50T is positioned on the surface of the roll 50R. As a result, the tip 50S1 of the wrap film 50 including the cut end 50T is positioned on the surface of the roll 50R. The cut end 50T becomes the end portion of the tip 50S1 of the wrap film 50 of the final roll in the roll 50R. Meanwhile, the portion beyond the cut end 50T that is positioned on the surface of the roll 50R (the start portion of the first turn) becomes the base end 50S2.

[0118] Next, the end tape TE is arranged so that the end of the end tape TE in the width direction DL is hung over the apex of the peak 50T1 on the outer side in the width direction adjacent to one of the valleys 50T2 to be measured among the cut end 50T. At this time, the position of the end of the end tape TE in the width direction DL may exceed the apex of the peak 50T1, as long as it is 30% or less of the length in the width direction DL from the apex of the peak 50T1 to the lowest point of one of the valleys 50T2 to be measured. The apex here refers to the most protruding part of the peak 50T1. The width direction of the end tape TE is the same direction as the width direction of the wrap film 50. The length in the width direction DL from the apex of the peak 50T1 to the lowest point of one of the valleys 50T2 to be measured is the length between the imaginary line where the apex of the peak 50T1 and an imaginary line in the horizontal direction perpendicularly intersect, and the imaginary line where the lowest point of the valley and an imaginary line in the horizontal direction perpendicularly intersect. Then, the end tape TE is attached in the circumferential direction of the wound body 50R from the tip end 50S1 to the base end 50S2 so that the end tape TE sufficiently covers the widthwise outer side from the top of the peak 50T1 adjacent to the valley 50T2 to be measured and does not peel off during measurement. At this time, the end tape TE is made to extend perpendicularly from the top of the peak 50T1 to the tooth bottom part at the cut end 50T. The length of the end tape TE in the width direction DL may be the same width as the center tape TC described below. The measurement point of the cut end 50T is divided into 5 equal parts in the width direction so that the entire width of the film can be evaluated evenly, and measurements are performed in each area. The end tape TE was used by cutting an adhesive tape (product name: Scotch Mending Tape 810, manufactured by Sumitomo 3M) with a thickness of 0.058 mm to an appropriate width.

[0119] Next, two peaks 50T1 and three valleys 50T2 are arranged between the end tape TE that was previously attached and another end tape TE that is to be attached next. The second end tape TE is also arranged in the same manner as the first end tape TE so that the end in the width direction of the end tape TE is hung on the top of the peak 50T1 on the outer side in the width direction adjacent to the valley 50T2 to be measured, and the end tape TE is attached in the circumferential direction of the wound body 50R from the tip end 50S1 to the base end 50S2. The position of the end in the width direction DL of the end tape TE may exceed the top of the peak 50T1 as long as it is 30% or less of the length in the width direction DL from the top of the peak 50T1 to the lowest point of one of the valleys to be measured. In this way, the first peak 50T1 aligned in the width direction DL is fixed to the surface of the wound body 50R by one end tape TE, and the fourth peak 50T1 is fixed to the surface of the wound body 50R by the other end tape TE.

[0120] Next, one central tape TC having a width that spans the two peaks 50T1 arranged in the width direction DL is prepared. The central tape TC is also the same tape as described above. Then, the central tape TC is attached only to the tip 50S1 of the wrap film 50 including the cut end 50T, so that each end of the central tape TC covers the tops of the two peaks 50T1 located between the two end tapes TE, and the tip 5 mm of one end of the central tape TC extending in the circumferential direction of the roll 50R. At this time, the position of the end of the central tape TC in the width direction DL may exceed the top of the peaks 50T1, as long as it is 30% or less of the length in the width direction DL from the top of each peak 50T1 to the lowest point of the valley 50T2 to be measured. The length of the central tape TC is 50 to 60 mm. The tape width is set to an appropriate width according to the cut end 50T to be measured. 12, the central tape TC is arranged so that the other portion (shaded portion) of the central tape TC other than the one end portion attached to the tip portion 50S1 does not touch the portion of the tip portion 50S1 to which the tape is not attached and the surface of the roll 50R (base end portion 50S2). To facilitate measurement, unnecessary adhesive surfaces of the central tape TC may be covered in advance with paper or tape. As a result, the cut end 50T has three valleys 50T2 between the end tape TE and the other end tape TE, and the first valley 50T2 of the three valleys 50T2 aligned in the width direction DL is sandwiched between one end tape TE and the central tape TC, and the third valley 50T2 is sandwiched between the other end tape TE and the central tape TC.

[0121] (iii) Pulling off the central tape TC The tip 50S1 of the wrap film 50 is peeled off from the surface of the roll 50R. At this time, the roll 50R is arranged so that the peeling direction of the central tape TC is normal to the tip 50S1 on the surface of the roll 50R. Then, the other end of the central tape TC is pulled toward the normal direction passing through the tip 50S1. At this time, the distance between the tip 50S1 on the surface of the roll 50R and the chuck of the tensile tester is 40 mm ± 5 mm. When the central tape TC is set in the chuck, it is confirmed that the central tape TC is not attached to the valley 50T2 between the two attached peaks 50T1 or the base end 50S2 side. Then, the other end of the central tape TC is pulled at a speed of 200 mm / min using a constant speed test method using a tensile tester. Then, the peak tensile load value when the cut end 50T is torn in a direction intersecting with the width direction DL is measured as one sample value.

[0122] To calculate the tear strength at the valleys of the wrap film 50, first, (i) forming the cut edges 50T, (ii) bonding the edge tapes TE and the central tape TC, and (iii) peeling the central tape TC are repeated 10 times to obtain 10 sample values ​​from one storage box 10. Then, sample values ​​that differ from the average of the 10 sample values ​​by 0.2 N or more are excluded as abnormal values, and the average of the sample values ​​after the abnormal values ​​have been excluded is calculated as the valley tear strength of the wrap film 50.

[0123] [How to evaluate recovery rate] The wrap film 50 was cut according to the cutting method recommended for the storage box 10, and the leading end 50S1 of the wrap film 50 including the cut end 50T was attached to the surface of the roll 50R and rewound to prepare the storage box 10 for the monitor test. The number of monitors was 60 people.

[0124] Each monitor was provided with one of the storage boxes 10 of Test Examples 1 to 16. The storage boxes 10 of Test Examples 1 to 16 contained the wrap film 50 after cutting it, and the leading end 50S1 of the wrap film 50 including the cut end 50T attached to the surface of the roll 50R, and the roll 50R was then rewound. Then, each monitor performed a recovery operation of peeling off the leading end 50S1 attached to the surface of the roll 50R over the entire width with their fingers. The number of monitors who were able to recover the rewinding over the entire width of the wrap film 50 without causing vertical tears within two minutes from the start of the recovery operation was counted. In addition, the ratio of the number of monitors who were able to recover the rewinding within two minutes to the total number of monitors (60 people) was calculated for each test example as the recovery rate for each test example.

[0125] [Test Example 1] Nuclewrap (registered trademark) 30×50 (manufactured by Kureha Corporation) was used for the container body 20 and the lid 30 in Test Example 1. For the cutting blade 35 in Test Example 1, a polyethylene terephthalate cutting blade 35 was used, which had a V-shaped overall width in the width direction DL, had a plurality of teeth 60 with the following dimensions in the outer area 35B in the width direction DL, and had 80% of the total number of teeth in the overall width of the cutting blade 35 with the following dimensions. For the wrap film 50 in Test Example 1, a polyvinylidene chloride wrap film 50 having the following physical properties was used.

[0126] <Tooth dimensions> Face width BW / tooth height TH: 1.79 Curvature radius R: 0.26mm Tooth area S: 0.66mm 2

[0127] <Physical properties of wrap film 50> Surface adhesion force F: 15N Tear strength: 30mN Tooth crack strength: 0.17N

[0128] <Adhesion index of wrap film 50> Surface contact force F x tooth area S: 9.9

[0129] [Test Examples 2 to 4] The wrap film 50 was changed from that of the storage box 10 of Test Example 1, and storage boxes 10 of Test Examples 2 to 4 were obtained.

[0130] In Test Example 2, a storage box 10 was obtained by storing a wrap film 50 made of polyvinylidene chloride having a tear strength of 28 mN. In Test Example 3, a polyvinylidene chloride wrap film 50 having a surface adhesion F of 20 N, a tear strength of 25 mN, and a valley crack strength of 0.15 N was placed inside the container to obtain a container box 10.

[0131] In Test Example 4, a polyvinylidene chloride wrap film 50 having a surface adhesion F of 15 N, a tear strength of 23 mN, and a valley crack strength of 0.11 N was placed inside the container to obtain a container box 10.

[0132] [Test Example 5] Nuclewrap (registered trademark) 30x50 (manufactured by Kureha Corporation) was used for the container body 20 and the lid 30 in Test Example 5. A polyethylene terephthalate cutting blade 35 was used for the cutting blade 35 in Test Example 5, which had a V-shaped overall width in the width direction DL, had a plurality of teeth 60 with the following dimensions in the outer area 35B in the width direction DL, and had 80% of the total number of teeth in the overall width of the cutting blade 35 with the following dimensions. A polyvinylidene chloride wrap film 50 having the following physical properties was used for the wrap film 50 in Test Example 5.

[0133] <Tooth dimensions> Face width BW / tooth height TH:1.80 Curvature radius R:0.60mm Tooth area S: 0.46mm 2

[0134] <Physical properties of wrap film 50> Surface adhesion force F: 15N Tear strength: 30mN Tooth crack strength: 0.40N

[0135] <Adhesion index of wrap film 50> Surface contact force F x tooth area S: 6.9

[0136] [Test Examples 6 to 8] The wrap film 50 was changed from that of the storage box 10 of Test Example 5 to obtain storage boxes 10 of Test Examples 6 to 8.

[0137] In Test Example 6, a polyvinylidene chloride wrap film 50 having a tear strength of 28 mN and a valley crack strength of 0.35 N was placed in the container to obtain a container box 10. In Test Example 7, a polyvinylidene chloride wrap film 50 having a surface adhesion F of 20 N, a tear strength of 25 mN, and a valley crack strength of 0.23 N was placed in the container to obtain a container box 10.

[0138] In Test Example 8, a polyvinylidene chloride wrap film 50 having a surface adhesion F of 15 N, a tear strength of 23 mN, and a valley crack strength of 0.15 N was placed inside the container to obtain a container box 10.

[0139] [Test Example 9] Nuclewrap (registered trademark) 30x50 (manufactured by Kureha Corporation) was used for the container body 20 and the lid 30 of Test Example 9. For the cutting blade 35 of Test Example 9, a polyethylene terephthalate cutting blade 35 was used, which had a V-shaped overall width in the width direction DL, had a plurality of teeth 60 with the following dimensions in the outer area 35B in the width direction DL, and had 80% of the total number of teeth in the overall width of the cutting blade 35 with the following dimensions. For the wrap film 50 of Test Example 9, a polyvinylidene chloride wrap film 50 having the following physical properties was used.

[0140] <Tooth dimensions> External area 35B tooth width BW / tooth height TH: 2.28 External area 35B tooth width BW / tooth height TH: 2.70 Radius of curvature R of outer area 35B: 0.56 mm Radius of curvature R of outer area 35B: 0.80 mm Tooth area S: 0.46mm 2

[0141] <Physical properties of wrap film 50> Surface adhesion force F: 15N Tear strength: 30mN Tooth crack strength: 0.40N

[0142] <Adhesion index of wrap film 50> Surface contact force F x tooth area S: 6.9

[0143] [Test Examples 10-12] The wrap film 50 was changed from that of the storage box 10 of Test Example 9, and storage boxes 10 of Test Examples 10 to 12 were obtained.

[0144] In the test example 10, a polyvinylidene chloride wrap film 50 having a tear strength of 28 mN and a valley crack strength of 0.35 N was placed in the container 10 to obtain the container box 10. In Test Example 11, a polyvinylidene chloride wrap film 50 having a surface adhesion F of 20 N, a tear strength of 25 mN, and a valley crack strength of 0.23 N was placed inside the container to obtain a container box 10.

[0145] In Test Example 12, a polyvinylidene chloride wrap film 50 having a surface adhesion F of 15 N, a tear strength of 23 mN, and a valley crack strength of 0.15 N was placed inside the container to obtain a container box 10.

[0146] [Test Example 13] Nuclewrap (registered trademark) 30x50 (manufactured by Kureha Corporation) was used for the container body 20 and the lid 30 in Test Example 13. A tinplate cutting blade 35 having a V-shaped overall width in the width direction DL and teeth 60 with the following dimensions across the entire width in the width direction DL was used for the cutting blade 35 in Test Example 13. A polyvinylidene chloride wrap film 50 having the following physical properties was used for the wrap film 50 in Test Example 13.

[0147] <Tooth dimensions> Face width BW / tooth height TH:2.24 Curvature radius R:0.64mm Tooth area S: 0.19mm 2

[0148] <Physical properties of wrap film 50> Surface adhesion force F: 15N Tear strength: 30mN Tooth crack strength: 0.64N

[0149] <Adhesion index of wrap film 50> Surface contact force F x tooth area S: 2.85

[0150] [Test Examples 14-16] The wrap film 50 was changed from that of the storage box 10 of Test Example 13, and storage boxes 10 of Test Examples 14 to 17 were obtained.

[0151] In Test Example 14, a container box 10 was obtained by storing a wrap film 50 made of polyvinylidene chloride having a tear strength of 28 mN and a valley tear strength of 0.46 N. In Test Example 15, a polyvinylidene chloride wrap film 50 having a surface adhesion F of 20 N, a tear strength of 25 mN, and a valley crack strength of 0.22 N was placed inside the container to obtain a container box 10.

[0152] In Test Example 16, a container box 10 was obtained by storing a wrap film 50 made of polyvinylidene chloride having a tear strength of 23 mN and a valley tear strength of 0.20 N. [Evaluation of Test Examples 1 to 16] Fig. 13 shows the dimensions of the teeth of the cutting blade 35, the physical properties of the wrap film 50, and the recovery rate of hand restoration for each of the storage boxes 10 of Test Examples 1 to 8. Fig. 14 shows the dimensions of the teeth of the cutting blade 35, the physical properties of the wrap film 50, and the recovery rate of hand restoration for each of the storage boxes 10 of Test Examples 9 to 16.

[0153] 13 and 14, the manual recovery rates of Test Examples 9 and 13 were 85% or more, which is 20% or more higher than the manual recovery rates of Test Examples 1 and 5. The manual recovery rates of Test Examples 12 and 16 were 40% or more, which is 14% or more higher than the manual recovery rates of Test Examples 4 and 8.

[0154] From these, on the premise that the surface adhesion force F and tear strength of the wrap film 50 are mutually equal, a tooth width BW / tooth height TH of 2.0 or more significantly increases the recovery rate by manual recovery. In other words, the storage box 10 satisfying condition A significantly increases the recovery rate by manual recovery work.

[0155] Moreover, the recovery rate by manual recovery of Test Example 5 was 62% or more, which is 13% higher than the recovery rate by manual recovery of Test Example 1. The recovery rates by manual recovery of Test Examples 9 and 13 were 85% or more, which is 36% or more higher than the recovery rate by manual recovery of Test Example 1. The recovery rate by manual recovery of Test Example 8 was 26%, which is 9% higher than the recovery rate by manual recovery of Test Example 4. The recovery rates by manual recovery of Test Examples 12 and 16 were 40% or more, which is 23% or more higher than the recovery rate by manual recovery of Test Example 4.

[0156] From these, it can be seen that, on the premise that the surface adhesion force F and tear strength of the wrap film 50 are equal to each other, a radius of curvature R of 0.5 or more increases the rate of restoration by hand restoration. In addition, on the premise that the surface adhesion force F and tear strength of the wrap film 50 are equal to each other, a tooth area S of 0.6 mm 2 Furthermore, the tooth width BW / tooth height TH is 2.0 or more, the curvature radius R is 0.5 or more, and the tooth area S is 0.6 mm or less. 2 The fact that the following conditions are met further increases the manual recovery rate compared to when these conditions are met separately. In other words, when the storage box 10 satisfies conditions B and C, the manual recovery rate is significantly increased. And, when the storage box 10 satisfies conditions A, B, and C, the manual recovery rate is further increased compared to when only conditions B and C are met.

[0157] Furthermore, the manual recovery rates of Test Examples 9, 10, and 11 were 65% or more, which is 25% or more higher than the manual recovery rate of Test Example 12. The manual recovery rates of Test Examples 13, 14, and 15 were 72% or more, which is 24% or more higher than the manual recovery rate of Test Example 16. From these, assuming that conditions A, B, and C are satisfied, the tear strength of the wrap film 50 being 25 mN or more significantly increases the manual recovery rate. In other words, the storage box 10 satisfying conditions A, B, and C and further satisfying condition D significantly increases the manual recovery rate.

[0158] Moreover, the recovery rate by manual restoration of Test Examples 9 and 10 was 82% or more, which is 17% or more higher than the recovery rate by manual restoration of Test Example 11. The recovery rate by manual restoration of Test Examples 9, 10, and 13 to 15 was 72% or more, which is higher than the recovery rate by manual restoration of Test Example 11. From these, on the premise that conditions A, B, C, and D are satisfied, the value obtained by multiplying the surface contact force F by the tooth area S being 9.0 or less increases the recovery rate by manual restoration to 70% or more. In other words, the fact that the storage box 10 satisfies conditions A, B, C, and D and further satisfies condition E keeps the recovery rate by manual restoration at a high level.

[0159] In addition, in the first teeth satisfying conditions A, B, and C, in test examples 9, 10, 13, and 14, the valley tear strength was 0.35 N or more, so that vertical tears were less likely to occur at the cut end 50T when the wrap film 50 was restored, increasing the restoration rate.

[0160] Furthermore, the first teeth of the cutting blade 35 may be located in at least one of the pair of outer areas 35B. When attempting to restore the entire width of the wrap film 50, users often perform the restoration work from the end of the wrap film 50. Therefore, by positioning the first teeth in the outer area 35B, vertical tearing of the cut end 50T of the wrap film 50 is suppressed when performing the restoration work from the end, making it easier to restore from the end and increasing the restoration rate.

[0161] Furthermore, the first tooth of the cutting blade 35 may be located in at least one of the pair of end areas 35E. The end area 35E is an area that includes the end of the cutting blade 35. When attempting to restore the entire width of the wrap film 50, users often perform the restoration work from the end of the wrap film 50. Therefore, by positioning the first tooth in the end area 35E, vertical tearing of the cut end 50T of the wrap film 50 during restoration work from the end is suppressed, making restoration from the end easier and increasing the restoration rate.

[0162] Additionally, the first tooth of the cutting blade 35 is connected to the hypotenuse of the second tooth and the hypotenuse of the third tooth by arcs, and each arc has a radius of curvature R of 0.5 mm or more. By having the above-mentioned radius of curvature R in the valley formed by the hypotenuse of the first tooth and the hypotenuse of the second tooth and the valley formed by the hypotenuse of the first tooth and the hypotenuse of the third tooth, vertical tearing of the cut end 50T is suppressed when the wrap film 50 is restored. This makes it easier to restore the wrap film 50.

[0163] [effect] As described above, the following effects can be obtained. (1) Since the storage box 10 satisfies conditions A to C, the recovery rate of the wrap film 50 during recovery work is increased.

[0164] (2) When the storage box 10 satisfies conditions A to D, the recovery rate of the wrap film 50 through the recovery work is further increased. (3) When the storage box 10 satisfies conditions A to C and E, or when the storage box 10 satisfies conditions A to E, the recovery rate of the wrap film 50 by the recovery work is further increased. [Explanation of symbols]

[0165] BW…Tooth width DL…Width direction R…curvature radius TH…Tooth height S…Tooth area SR1,SR2,SL1,SL3,56…Hintenuse 10…Storage box 20…Container body 21…Front panel 22...Rear plate 23…Right side plate 24…Left side panel 25…Bottom plate 30…Lid body 32P…Lid front plate 35…Cutting blade 35A…Central area 35B…Outside area 35S…Side area 35E…End area 50…Wrapping film 50R…Rolled body 60…tooth 611…1st central large tooth 641…First outward tooth 651…First end large tooth

Claims

1. A wrap film roll in which the wrap film is wound in the machine direction; A storage box for storing the wrap film roll, The container includes: A container body having a bottom plate, a front plate, a rear plate, and a pair of side plates, the container body having an open top surface for accommodating the wrap film roll; A lid body, The lid body is a cover plate connected to an upper end edge of the rear plate and configured to be capable of opening and closing the opening of the container body; a front cover plate connected to the cover plate and overlapping the outside of the front cover plate when the cover plate closes the opening of the container body; a cutting blade having a plurality of teeth extending in a width direction, which is a direction perpendicular to the flow direction, and cutting the wrap film unwound from the wrap film roll and pulled out from between the front plate and the front lid plate; A storage box containing a wrap film roll, The plurality of teeth on the cutting blade include: A first tooth; a second tooth adjacent to the outer side of the first tooth in the width direction; one third tooth adjacent to the inside of the first tooth in the width direction, The first tooth satisfies the following conditions A, B, and C: A storage box containing a wrap film roll. (Condition A) The first tooth bottom is the lowest point at the intersection of the outer hypotenuse of the first tooth in the width direction and the inner hypotenuse of the second tooth in the width direction, and the second tooth bottom is the lowest point at the intersection of the inner hypotenuse of the first tooth in the width direction and the outer hypotenuse of the third tooth in the width direction, the tooth width is the distance in the width direction between the first tooth bottom and the second tooth bottom, a straight line connecting the first tooth bottom and the second tooth bottom is a tooth bottom line, the tooth height is the distance from the tooth tip of the first tooth to the tooth bottom line of a perpendicular line drawn from the tooth tip to the tooth bottom line, and the value of the tooth width / tooth height is 2.0 or more. (Condition B) The outer hypotenuse in the width direction of the first tooth and the inner hypotenuse in the width direction of the second tooth are connected by a circular arc, and the inner hypotenuse in the width direction of the first tooth and the outer hypotenuse in the width direction of the third tooth are connected by another circular arc, and the radius of curvature R of each arc is 0.5 mm or more. (Condition C) The area of ​​the first tooth bounded by the outer oblique side in the width direction of the first tooth, the inner oblique side in the width direction of the first tooth, and the tooth base line of the first tooth is 0.6 mm ２ The following is the result.

2. The average value of the tear strength of the wrap film in the machine direction and the tear strength of the wrap film in the width direction is 25 mN or more; A storage box containing the wrap film roll according to claim 1.

3. The surface adhesion strength of the wrap film (N / 25 cm ２ ) to the area of ​​the first tooth (mm ２ ) is multiplied by the adhesion index of the wrap film, the adhesion index is 9.0 or less, A storage box containing the wrap film roll according to claim 1 or 2.

4. The first teeth account for 50% or more of the total number of teeth on the cutting blade. A storage box containing the wrap film roll according to claim 1 or 2.

5. The cutting blade includes a central area and a pair of outer areas disposed outside the central area in the width direction, the central area comprises a plurality of said teeth; the outer area comprises a plurality of said teeth; The first tooth is located in at least one of the pair of outer areas. A storage box containing the wrap film roll according to claim 1 or 2.

6. The pair of outer areas include a pair of side areas adjacent to the outer sides of the central area in the width direction, and a pair of end areas arranged on the outer sides of the pair of side areas in the width direction, The first tooth is located in at least one of the pair of end areas. A storage box containing the wrap film roll according to claim 5.

Images