JP6932286B2 - Cutting blades and packaging containers - Google Patents

Description

The present invention relates to cutting blades and packaging containers.

The film-like package used for food packaging and the like is rolled into a roll and housed in a substantially rectangular parallelepiped packaging container. The packaging container usually has a storage box for storing the package and a saw-shaped cutting blade in which a plurality of teeth are arranged for cutting the package drawn from the storage box in a used amount. .. The storage box has a main body of a substantially rectangular parallelepiped having one surface as an opening surface and a lid portion for opening and closing the opening surface, and the cutting blade is arranged on an end side of the lid portion. NS. The user of the package pulls out the film-like package from the gap between the main body and the lid by grasping and pulling the end of the package contained in the storage box, closes the lid, and closes the main body. By cutting the package sandwiched between the portion and the lid portion with the above-mentioned cutting blade, the used amount of the package can be taken out from the packaging container.

As a method of cutting the package drawn out from the packaging container, a method of rotating the packaging container to cut the package from the center (hereinafter, such a cutting method is also simply referred to as "center cut"). , A method of cutting from the widthwise end of the package by grasping the widthwise end of the package and twisting it with respect to the packaging container (hereinafter, such a cutting method is also simply referred to as "end cut". ), Is known. In Patent Document 1 and Patent Document 2, a V-shaped cutting blade facilitates cutting from the center, while a tooth having a tooth tip facing outward in a side area of the cutting blade (hereinafter, simply "" It is also referred to as an "extroverted tooth". A tooth whose tip does not face outward and faces a direction close to vertical so as to face the bottom of the packaging container when the lid is closed is shown in the upward direction in the drawing described later. Described is a packaging container having a cutting blade that facilitates cutting from the widthwise end by arranging (hereinafter, also simply referred to as "upward teeth") because it faces.

In such a packaging container, the package cut by the reverse rotation of the wound package is rewound into the inside of the main body, and the end portion of the package is placed on the surface of the wound package. It may stick. Then, when the end portion that has been stuck is restored between the main body portion and the lid portion (hereinafter, also simply referred to as "recovery time"), the package is torn (vertically torn) in the winding direction. ) Is known to occur. The mechanism of action that causes longitudinal tears is thought to be as follows. That is, when the tips of adjacent teeth are pierced into the package and the breaks to the package initiated by the respective tips merge, the breaks initiated by one of the adjacent teeth are excessive. A notch (crack) is generated at the confluence of fractures. Then, when the stress applied to the package due to peeling from the wound package is concentrated on the notch, a new fracture starting from the notch progresses and a vertical tear occurs. ..

Patent Document 3 describes a cutting blade in which a plurality of teeth having different tooth heights are alternately arranged and the hypotenuses of adjacent teeth are connected by an arc. According to Patent Document 3, the distance between the point where the extension lines of the facing diagonal sides intersect and the arc is defined as a "smooth distance", and the tooth height is the same as the point where the extension lines of the facing diagonal sides intersect. When the distance between the straight line connecting the tips of a plurality of teeth is defined as the "first distance" and the "second distance" according to the respective tooth heights, the ratio of the smoothing distance to the first distance and the second distance It is described that vertical tearing is suppressed by setting the ratio of the smoothing distance to the above within a predetermined range.

JP-A-2009-83917 Japanese Unexamined Patent Publication No. 2010-20656 JP-A-2009-132406

In the cutting blades described in Patent Document 1 and Patent Document 2, the outward teeth make it easier to cut the package from the widthwise end portion. Further, with the cutting blade described in Patent Document 3, vertical tearing is unlikely to occur, so that restoration is easy.

However, according to the findings of the present inventors, even with the cutting blades described in Patent Document 1 and Patent Document 2, the package is cut in an unintended diagonal direction (diagonal cutting) when cutting from the widthwise end. ) May occur. This is because even with the outward teeth described in Patent Document 1 and Patent Document 2, the teeth at the end are not sufficiently pierced into the package when cutting from the end in the width direction, and the package slips sideways. It is thought that this is the case.

Further, according to the findings of the present inventors, the cutting blade described in Patent Document 3 does not completely suppress the occurrence of tearing in the package during restoration, and the packaging is packaged at the time of rewinding. Sometimes it was difficult to recover so that the body would not tear.

The present invention has been made in view of the above problems, and a cutting blade capable of easily cutting a package from both the center and the end in the width direction and easily recovering at the time of rewinding, and the cutting blade. The purpose is to provide a packaging container that has.

One aspect of the present invention for solving the above problems relates to a cutting blade provided along the longitudinal direction of a packaging container for accommodating a roll-shaped package and cutting the package. The cutting blade has a central area in which a plurality of teeth are arranged and a pair of external areas in which a plurality of teeth are arranged outside the central area. Has facing outward teeth. The hypotenuse on the outside of the outward tooth and the hypotenuse on the inside of the adjacent tooth arranged adjacent to the outside of the outward tooth are connected by an arc, and the radius of curvature (R1) of the arc is 0.3 mm or more. It is 1.3 mm or less.

Another aspect of the present invention relates to a packaging container having a storage box for storing a roll-shaped package and a cutting blade for cutting the package drawn from the storage box.

INDUSTRIAL APPLICABILITY The present invention provides a cutting blade that can easily cut a package from both the center and the end in the width direction and that can be easily restored at the time of rewinding, and a packaging container having the cutting blade.

FIG. 1 is a perspective view schematically showing a configuration of a packaging container according to an embodiment of the present invention when the lid is closed. FIG. 2 is a perspective view when the lid portion is opened, schematically showing the configuration of the packaging container according to the embodiment of the present invention. FIG. 3 is a front view showing a schematic configuration of a cutting blade according to an embodiment of the present invention. FIG. 4 is a partially enlarged view of region X in FIG. 3, showing the teeth constituting the central area of the cutting blade according to the embodiment of the present invention. FIG. 5 is a partially enlarged view of region Y in FIG. 3, showing the teeth constituting the side area of the cutting blade according to the embodiment of the present invention. FIG. 6 is a partially enlarged view of a region Z in FIG. 3 showing the teeth constituting the end area of the cutting blade according to the embodiment of the present invention. FIG. 7 is a front view showing a schematic configuration of a cutting blade according to another embodiment of the present invention. FIG. 8 is a partially enlarged view of the region S in FIG. 7, showing the teeth constituting the vicinity of the boundary between the central area and the side area (side connection region) of the cutting blade according to another embodiment of the present invention. FIG. 9 is a partially enlarged view of the region T in FIG. 7, showing the teeth constituting the vicinity of the boundary between the side connection region and the side main region of the cutting blade according to another embodiment of the present invention. FIG. 10 is a partially enlarged view of the region U in FIG. 7, showing the teeth constituting the end connection region and the end main region of the cutting blade according to another embodiment of the present invention. FIG. 11 is a perspective view when the lid is closed, schematically showing the configuration of the packaging container according to another embodiment of the present invention. FIG. 12 is a perspective view when the lid portion is closed, schematically showing the configuration of the packaging container according to still another embodiment of the present invention.

[First Embodiment]
(Packaging container)
FIG. 1 is a perspective view when the lid portion is closed, which schematically shows the configuration of the packaging container 10 according to the embodiment of the present invention, and FIG. 2 is a lid which schematically shows the configuration of the packaging container 10. It is a perspective view when the part is opened.

The packaging container 10 has a storage box 100 for retractably accommodating a package 50 formed by winding a long packaging film or the like around a winding core in a roll shape, and a cutting blade 200.

The storage box 100 has a main body 110 that houses the package 50, and a lid 120 that is rotatably connected to the main body 110. The main body 110 and the lid 120 are integrally formed by bending a sheet of cardboard.

In the following description, the "width direction" is a direction along the winding axis of the wound package, and means a direction in which the winding core of the package extends. Further, the "winding direction" means a direction orthogonal to the width direction in the package and a direction approaching the winding core from the end side drawn out during use. Further, the "end" means the end in the width direction of the cutting blade, and the "outside" means the direction of the cutting blade from the central side to the end side in the direction in which the teeth are arranged. However, "inside" means the direction from the end side to the center side in the direction in which the teeth are arranged in the cutting blade.

Further, in the following description, the "upper end" means the ends of the front plate 114 and the rear plate 116 on the opposite side of the bottom plate 118, and the "both ends" mean that the front plate 114 faces the front. It means the left and right ends of each member constituting the packaging container when the packaging container 10 is arranged.

The main body 110 has a pair of end plates 112a and 112b, a front plate 114 and a rear plate 116, and a bottom plate 118. The main body 110 has a substantially rectangular parallelepiped shape formed by refracting the end plates 112a and 112b, and the front plate 114 and the rear plate 116 arranged around the bottom plate 118 in the developed view in the same direction with respect to the bottom plate 118. It is a box. The main body 110 has an opening surface 119 on the upper surface side facing the bottom plate 118.

The lid portion 120 is rotatably connected to the rear plate 116 along the connecting portion 128 with the rear plate 116 by refracting the extending portion extending from the upper end of the rear plate 116 toward the front plate 114. NS. The lid portion 120 has a lid plate 122, a cover piece 124, and a pair of side cover pieces 126a and 126b. The lid portion 120 is formed by refracting the cover piece 124 and the side lid pieces 126a and 126b arranged around the lid plate 122 in the developed view in the same direction with respect to the lid plate 122.

The lid plate 122 is a substantially rectangular plate-shaped member having substantially the same shape and size as the opening surface 119, and opens and closes the opening surface 119 by rotating along the connecting portion 128. The cover piece 124 is connected to the lid plate 122 by refracting the extending portion extending from the front end of the lid plate 122 toward the bottom plate 118 when the lid plate 122 closes the opening surface 119. It is a formed plate-shaped member, and is arranged at a position where the lid plate 122 covers the upper end side region of the front plate 114 when the opening surface 119 is closed.

The lid piece 124 has a shape in which the length from the front end of the lid plate 122 to the tip 125a of the lid plate 124 increases from both ends of the front end of the lid plate 122 toward the center. As a result, the tip 125 of the cover piece 124 has a substantially V shape facing the bottom plate 118 when the cover plate 122 closes the opening surface 119 and the cover piece 124 covers the front plate 114. For example, in the cover plate 124, the length from the front end to the tip 125a of the cover plate 124 at the central portion of the front end of the lid plate 122 is approximately 3/4 of the length of the short side of the front plate 114, and the lid plate. It has a shape such that the length from the front end to the tip 125b of the cover piece 124 at the end of the front end of 122 is approximately ½ of the length of the short side of the front plate 114.

The cutting blade 200 is a cutting blade having a substantially V-shape that is substantially the same as the tip 125 of the cover piece 124, and is, for example, the tip of the cover piece 124 by ultrasonic bonding via a sealant, an adhesive, or the like. It is arranged so as to be adhered along the longitudinal direction at a position on the inner surface side of 125.

The packaging container 10 is stored in a state where the lid 120 closes the opening surface 119 and the cover piece 124 faces the front plate 114 and covers the front plate 114. At this time, the tip of the package 50 housed in the main body 110 is pulled out from the opening surface 119 and comes into contact with the front plate 114. The user of the package 50 grasps the tip of the packaging film or the like which is the package 50 with the lid 120 slightly opened, draws out only the amount used, closes the lid 120, and cuts the blade. The package 50 is cut by 200. At this time, while pressing the central portion of the cover piece 124 with the thumb and pressing the cover piece 124 against the front plate 114, the packaging container 10 is rotated downward to move the packaging film or the like, which is the package 50, to the center thereof. It can be cut from the portion by the cutting blade 200 (center cut). Alternatively, the widthwise end of the drawn package 50 is gripped and the gripped widthwise end is twisted upward with respect to the storage box 100, or the gripped accommodation corresponding to the widthwise end. By twisting the widthwise end of the box 100 downward, the packaging film or the like, which is the package 50, can be cut from the widthwise end by the cutting blade 200 (end cut).

(Cut blade)
FIG. 3 is a front view showing a schematic configuration of the cutting blade 200 according to the present embodiment. The cutting blade 200 has a plurality of teeth arranged in the upper region of the cutting blade 200 in FIG. 3, and is adhered to a position where the lower region of the cutting blade 200 in FIG. 3 is the inner surface side of the tip 125 of the lid piece 124. The plurality of teeth are arranged so as to slightly protrude from the tip 125.

The cutting blade 200 includes a central area 210, a pair of side areas 220 arranged outside the central area 210, and a pair of end areas 230 arranged at the ends of the cutting blade 200 outside the side area 220. Have. A plurality of teeth are arranged in each of the central area 210, the side area 220, and the end area 230. In the present embodiment, the central area 210 is in the range of 5 to 20% of the total width in the width direction of the cutting blade 200, and the side area 220 is the outer side of the cutting blade 200 of the cutting blade 200. The range is 50 to 75% of the total width length in the width direction, and the end area 230 is the range of 10 to 35% of the total width length in the width direction of the cutting blade 200 outside the side area 220. be. Further, in the present specification, the side area 220 and the end area 230 are collectively referred to as an "external area".

In the present embodiment, the configuration having the central area 210, the side area 220, and the end area 230 will be described, but the configuration does not have the end area 230 and is composed of the central area 210 and the side area 220. There may be. In that case, the central area 210 is in the range of 20 to 30% of the total width in the width direction of the cutting blade 200, and the side area 220 is outside the central area 210 in the width direction of the cutting blade 200. It ranges from 70 to 80% of the total width.

The cutting blade 200 has a substantially V shape as a whole. As a result, since the central area 210 is arranged so as to protrude from the side area 220, the teeth of the central area 210 can be easily inserted into the package 50 at the initial stage of the central cut, and the central cut can be performed more easily.

(Central area)
FIG. 4 is a partially enlarged view of the region X in FIG. 3, showing the teeth constituting the central area 210. The cutting blade 200 is symmetrically configured in the width direction of the cutting blade 200 with the apex of the central area 210 interposed therebetween. The central area 210 includes a plurality of central teeth having different tooth heights, and the plurality of central teeth are arranged in a staggered manner so that the tips of the three consecutive central teeth are not located on the same straight line. .. The central area 210 is the area where the tooth tips first reach the package 50 in the central cut. At this time, since the tips of the three consecutive central teeth are not located on the same straight line, the central teeth are inserted into the package 50 at the same time so as to reach the package 50 in order from the central tooth having the highest tooth height. The number of can be reduced. As a result, the stress for cutting the package 50 is always distributed to only a smaller number of central teeth, making it easier to insert the tip of each central tooth in the central area 210 into the package 50. At the beginning of the central cut, the cutting of the package 50 can be started with less stress. Therefore, the central area 210 can reduce the feeling of resistance to the user at the initial stage of the central cut.

Specifically, the central area 210 has a plurality of central large teeth 212 having the highest tooth height, a plurality of central middle teeth 214 having a tooth height smaller than that of the central large tooth 212, and a tooth height smaller than that of the central middle tooth 214. It has a central small tooth 216.

In the present embodiment, as shown in FIG. 4, the central tooth of any of the central large tooth 212, the central middle tooth 214, and the central small tooth 216 constituting the central area 210 is an extension of the inner oblique side of the central tooth. Assuming that the intersection CS with the extension line of the outer oblique side of the central tooth adjacent to the inside of the central tooth is the intersection CS, the central large tooth 212, the central middle tooth 214, and the central small tooth constituting the central area 210 216 has a shape in which the intersection CS for all the central teeth is located on the same virtual straight line (hereinafter, also simply referred to as “tooth bottom line L1”). In the present embodiment, the central large tooth 212, the central middle tooth 214, and the central small tooth 216 have an arcuate shape on the inner hypotenuse of the central tooth and the outer hypotenuse of the central tooth adjacent to the inner side of the central tooth. be. The outer hypotenuse and the inner hypotenuse are composed of arcs that form a part of two different circles, and the extension lines of the outer hypotenuse and the inner hypotenuse are the outer hypotenuse and the inner hypotenuse, respectively. It is an extension of the arc that constitutes. However, one of the inner hypotenuse of the central tooth and the outer hypotenuse of the central tooth adjacent to the inner side of the central tooth may be arcuate and the other linear, or both may be linear. It may be. When the hypotenuse is straight, the intersection of the extension lines of each straight line is set as the intersection CS.

Further, in the present embodiment, the central large tooth 212, the central middle tooth 214, and the central small tooth 216 constituting the central area 210 are the tooth tips of the central teeth and the central teeth adjacent to the central teeth for all the central teeth. The point of contact with the virtual straight line parallel to the tooth bottom line L1 to which the side connecting to the tooth tip of the tooth (hereinafter, also simply referred to as "joining side") is in contact with the same straight line (hereinafter, simply referred to as "tooth valley line L2'"). It has a shape located above. However, the central large tooth 212, the central middle tooth 214, and the central small tooth 216 do not have to have the above-mentioned contact points located on the same tooth valley line L2'for all the central teeth, and a plurality of tooth valleys in the central area 210. A line may be set.

Further, in the present embodiment, the tooth tips of all the central middle teeth 214 are located on the same virtual straight line (hereinafter, also simply referred to as "middle tooth line L3"), and the tooth tips of all the central large teeth 212 are It is located on the same virtual straight line (hereinafter, also simply referred to as "large tooth line L4"). The straight lines L1, L2', L3 and L4 are all parallel, and if the virtual straight line passing through the tip of the central small tooth 216 and parallel to the straight lines L3 and L4 is the small tooth line L5, the tooth bottom line L1 and the tooth valley line L2' , Small tooth line L5, medium tooth line L3 and large tooth line L4 are arranged in this order.

The central large tooth 212 is arranged at a position that is the apex of the V shape that is also the center of the cutting blade 200 in the central area 210 (central large tooth 212a in FIG. 4), and both of the positions that are the apex of the V shape. A plurality of teeth are arranged on the outside (two central large teeth 212b and 212c in FIG. 4). The central large tooth 212 is the central tooth that is first inserted into the package 50 at the initial stage of the central cut, and is inserted in order from the central large tooth 212a arranged at the apex of the V shape toward both outer sides. By going on, cutting of the package 50 is started. This allows cutting in the early stages of the central cut to begin with less stress. Further, the central large tooth 212 has high mechanical strength because the width of the tooth root is larger. Therefore, by arranging the plurality of central large teeth 212 in the central area 210, the mechanical strength of the central area 210 can be increased and the durability of the cutting blade 200 can be enhanced.

A plurality of central middle teeth 214 (four on one side in FIG. 4) are arranged over the entire central area 210. The central middle tooth 214 is pierced into the package 50 following the central large tooth 212 to further advance the cutting of the package 50. At this time, some of the central middle teeth 214 (two central middle teeth 214a and central middle teeth 214b in FIG. 4) are arranged at positions sandwiched between the two central large teeth 212, so that the tooth roots are formed. The wide valley of the central large tooth 212 having a wide width reduces the resistance to cutting due to being caught in the package 50 at the time of cutting, and the cutting of the package 50 can be made easier. Further, some other teeth of the central middle tooth 214 (two central middle teeth 214c and the central middle tooth 214d in FIG. 4) are arranged in the area of the central area 210 on the side area 220 side and packaged. The cutting of the object 50 is smoothly transferred from the central area 210 to the side area 220.

One or more central small teeth 216 are arranged in the area of the central area 210 on the side area 220 side (one on one side in FIG. 4), and the package 50 is cut together with the central middle teeth 214c and 214d. Is smoothly transferred from the central area 210 to the side area 220.

The central large tooth 212, the central middle tooth 214, and the central small tooth 216 constituting the central area 210 all have the outer hypotenuse of the central tooth and the inner hypotenuse of the adjacent central tooth on the outside of the central tooth. It is connected via one or more arcs without any refraction points. It should be noted that the fact that they are connected without having an inflection point means that both the hypotenuse on the outside of the tooth, the hypotenuse on the inside of the adjacent tooth on the outside of the tooth, and the arc are all in contact with each other. It is a rounded intersection, and it means that a vertex-like bend whose inclination changes discontinuously is not formed. According to the findings of the present inventors, the hypotenuses of the respective central teeth or the hypotenuses and the tooth valleys are connected to each other so as to have a certain angle (to have a refraction point), as compared with the case where the hypotenuses of the respective central teeth are connected to each other so as to have a refraction point. If the hypotenuses are connected without having a refraction point (no refraction point is generated between the tooth ridges), the traveling direction of the notch generated at the confluence of breaks becomes closer to the width direction of the package 50. Vertical tears during restoration are less likely to occur.

Further, in the present embodiment, the radius of curvature (Rc) of each of the above arcs connecting the outer hypotenuse of one central tooth and the inner hypotenuse of the adjacent central tooth on the outer side of the central tooth is 0. It is 5 mm or more and 1.3 mm or less. When the radius of curvature (Rc) is 0.5 mm or more, it is possible to make it difficult for a notch to occur at the confluence of fractures, and the traveling direction of the notch generated at the confluence of fractures is more widespread in the package 50. It is possible to make it closer to the direction so that vertical tearing at the time of restoration is less likely to occur. When the radius of curvature (Rc) is 1.3 mm or less, the package 50 is less likely to be caught in the arc during cutting, and cutting can be performed more easily. From the above viewpoint, the preferable range of the radius of curvature Rc is 0.5 mm or more and 1.2 mm or less, and the more preferable range is 0.6 mm or more and 1.2 mm or less.

In the present embodiment, the central area 210 does not have outward teeth, and all of them are upward teeth. In other words, the outward teeth are arranged only in the external area (only the side area 220 in this embodiment). The central area 210 having no outward teeth can make it difficult for the package 50 to be caught in the outward teeth at the initial stage of cutting the central cut, thereby making it difficult for the cutting to be interrupted.

(Side area)
FIG. 5 is a partially enlarged view of the region Y in FIG. 3, showing the side teeth constituting the side area 220. The side area 220 includes a plurality of side teeth 222 having the same tooth height, and in the present embodiment, the plurality of side teeth 222 are all outward teeth having tooth tips facing outward. Is. The side area 220 is a region in which the cutting of the package 50 started in the central area 210 proceeds toward the end of the package 50 in the central cut, and is started in the end area 230 in the end cut. This is a region where the cutting of the package 50 is advanced toward the center of the package 50. In the side area 220, since the plurality of side teeth 222 constituting the side area 220 are all outward teeth, it is easy to insert the side teeth 222 into the package 50 particularly at the time of edge cutting, and the package 50 is relative to the side teeth. Diagonal cutting is unlikely to occur due to skidding.

In the present specification, as shown in FIG. 5, one of the side teeth 222 (extrovert teeth) constituting the side area 220 is T1, and the adjacent teeth arranged adjacent to the outside of the side teeth T1 are designated as T1. Let T2 be, and let T3 be an adjacent tooth arranged adjacent to the inside of the side tooth T1. Further, as shown in FIG. 5, the point where the extension line of the outer hypotenuse of the side tooth T1 and the extension line of the inner hypotenuse of the adjacent tooth T2 intersect is defined as the intersection S1 and the inner hypotenuse of the side tooth T1. The point where the extension line and the extension line of the outer hypotenuse of the adjacent tooth T3 intersect is defined as the intersection S2.

Further, the perpendicular line drawn from the tip of the side tooth T1 with respect to the virtual straight line connecting the intersection S1 and the intersection S2 (in the present embodiment, the same straight line as the tooth bottom line L1) is the above virtual straight line (tooth bottom line). The point that intersects with L1) is designated as the intersection S3. Further, the distance between S1 and S3 is D1, and the distance between S1 and S2 is D2.

At this time, in the present embodiment, the ratio of D1 and D2 satisfies the following formula 1.
D1 / D2 = 0.20 or more and 0.40 or less ... (Equation 1)

When D1 / D2 is 0.40 or less, the tip of the side tooth T1 (outward tooth) faces more outward, so that the side tooth T1 is inserted into the package 50 with less stress at the time of edge cutting. This allows the cutting of the package 50 to proceed easily. Therefore, it is possible to suppress the occurrence of diagonal cutting due to the side teeth T1 not being sufficiently pierced into the package 50 at the time of edge cutting and the package 50 skidding with respect to the side teeth. When D1 / D2 is 0.20 or more, the tip of the side tooth T1 (outward tooth) does not face too outward, so that the cutting progress of the package 50 started in the central area 210 at the time of the central cut. Is less likely to be blocked by the side teeth T1 and the cutting is more likely to proceed in the end direction. Further, this makes it possible to suppress the occurrence of diagonal cutting at the time of edge cutting. A more preferable range that can be cut well from either the edge cut or the center cut is D1 / D2 = 0.25 or more and 0.38 or less, and a more preferable range is D1 / D2 = 0.26 or more and 0.37 or less. ..

In the present specification, for all of the central tooth, the lateral tooth and the end tooth, the "outward tooth" is a tooth having D1 / D2 calculated by the above method with the tooth as T1 and having a D1 / D2 of less than 0.50. The term "upward tooth" means a tooth having D1 / D2 of 0.50 or more (preferably 0.75 or less).

The plurality of side teeth 222 (extrovert teeth) constituting the side area 220 are all lateral hypotenuses of the side teeth (extrovert teeth) and side teeth (extrovert teeth) adjacent to each other on the outside of the side teeth. ) Is connected to the inner hypotenuse via one or more arcs without having an inflection point. As a result, cutting of the package 50 occurs along the hypotenuse, and it becomes difficult for the package 50 to proceed in the direction of the wound body. Vertical tearing in the direction of the ticket rotation is less likely to occur, and recovery at the time of rewinding becomes easier.

In the present embodiment, the arc connecting the outer hypotenuse of the side tooth T1 and the inner hypotenuse of the adjacent tooth T2 has a radius of curvature (R1) of 0.3 mm or more for any of the side teeth. It is 3 mm or less. When the radius of curvature (R1) is 0.3 mm or more, vertical tears are less likely to occur at the confluence of fractures, and recovery at the time of rewinding can be performed more easily. When the radius of curvature (R1) is 1.3 mm or less, the package 50 is less likely to be caught in the arc, and cutting can be performed more easily in both the center cut and the edge cut. From the above viewpoint, the preferable range of the radius of curvature R1 is 0.35 mm or more and 1.2 mm or less, and the more preferable range is 0.35 mm or more and 1.0 mm or less.

The radius of curvature R of the outer oblique side of the side tooth T1 is preferably 1.0 mm or more and 10.0 mm or less, and more preferably 1.5 mm or more and 8.0 mm or less. The radius of curvature R of the inner oblique side of the adjacent tooth T2 is preferably 1.0 mm or more and 7.0 mm or less, and more preferably 1.5 mm or more and 6.0 mm or less. By setting each radius of curvature to the above value, the resistance to cutting due to the vicinity of the bottom of the connecting side being caught by the package 50 at the time of cutting is reduced, the package 50 can be cut more easily, and the merging of breaks. Vertical tears are less likely to occur at the points, and recovery at the time of rewinding can be performed more easily.

In the present embodiment, the virtual straight line parallel to the tooth bottom line L1 that is in contact with the connecting side connecting the tooth tip of the side tooth T1 and the tooth tip of the adjacent tooth T2 is a tooth valley parallel to the tooth valley line L2'. It is a straight line different from the line L2'(hereinafter, also simply referred to as "tooth valley line L2"). In the present embodiment, the tooth valley line L2 is located between the tooth valley line L2'and the small tooth line L5 (see FIG. 4). Further, the virtual straight line connecting the tooth tips of the side teeth 222 (extroverted teeth) is the same straight line as the middle tooth line L3. The position of the virtual straight line connecting the tooth tips of the side teeth is not particularly limited, and may be the same straight line as the small tooth line L5 or a straight line higher than the small tooth line L5 and lower than the large tooth line L4. .. In FIG. 5, the tooth tips of all the side teeth are located on the middle tooth line L3, but the tooth tips of all the side teeth are on the same virtual straight line (middle tooth line L3 in FIG. 5). It does not have to be located in. In other words, the side area 220 may have a plurality of side teeth having different distances from the bottom line L1 to the tooth tips of the side teeth.

(End area)
FIG. 6 is a partially enlarged view of the region Z in FIG. 3, showing the teeth constituting the end area 230. The end area 230 includes a plurality of end teeth having different tooth heights, and in the present embodiment, the plurality of end teeth are all upward teeth. Further, the plurality of end teeth are arranged in a staggered manner so that the tips of the three consecutive end teeth are not located on the same straight line. The end area 230 is the area where the tooth tips first reach the package 50 in the end cut. At this time, since the tips of the three consecutive end teeth are not located on the same straight line, the end teeth having the highest tooth height are reached in order from the end teeth, and are simultaneously pierced into the package 50. The number of end teeth can be reduced. As a result, the stress for cutting the package 50 is always distributed to only a smaller number of end teeth, making it easier to insert the tips of the end teeth in the end area 230 into the package 50. Therefore, in the early stage of edge cutting, cutting of the package 50 can be started with less stress. Therefore, the end area 230 can reduce the feeling of resistance to the user at the initial stage of the end cut.

On the other hand, the end area 230 is the area where the package 50 is finally cut in the central cut. Also at this time, when the packaging container 10 is rotated downward, the end area 230 advances from the central area 210 to the side area 220 by sequentially inserting the respective end teeth into the package 50. The cutting of the package 50 can proceed smoothly.

Specifically, the end area 230 has a plurality of large end teeth 232 having a large tooth height, and a plurality of middle end teeth 234 having a tooth height smaller than that of the large end teeth 232.

In the present embodiment, a plurality of large end teeth 232 are arranged in the end area 230 (two large end teeth 232a and 232b in FIG. 6). The large end tooth 232 is the tooth that is first inserted into the package 50 at the initial stage of end cutting, and is inserted in order from the large end tooth 232 arranged at the position to be the end of the cutting blade 200 toward the center side. By being incorporated, cutting of the package 50 is started. This allows cutting in the early stages of edge cutting to begin with less stress. Further, the large end tooth 232 has a high mechanical strength because the width of the tooth root is larger. Therefore, by arranging the plurality of large end teeth 232 in the end area 230, the mechanical strength of the end area 230 can be increased and the durability of the cutting blade 200 can be improved.

The end middle tooth 234 is pierced into the package 50 following the end large tooth 232 to further advance the cutting of the package 50. Some of the end middle teeth 234 (end middle teeth 234a in FIG. 6) are arranged at positions sandwiched between the two end large teeth 232, so that the end large teeth 232 having a wide tooth base are arranged. The wide valley of the sill can reduce the resistance to cutting due to being caught on the package 50 at the time of cutting, and can make the cutting of the package 50 easier. Further, the other end middle teeth (end middle teeth 234b in FIG. 6) of the end middle teeth 234 are arranged in the area of the end area 230 on the side area 220 side to cut the package 50 at the end. The smooth transition from the part area 230 to the side area 220.

In both the large end tooth 232 and the middle end tooth 234 constituting the end area 230, the outer hypotenuse of the end tooth and the inner hypotenuse of the adjacent end tooth on the outside of the end tooth are 1. It is connected via one or more arcs without a refraction point. As described above, when the hypotenuses of the respective end teeth are connected via an arc, vertical tearing is less likely to occur at the confluence of fractures, and recovery at the time of rewinding can be performed more easily.

In the present embodiment, the radius of curvature R of the outer oblique side of the end tooth is preferably 1.0 mm or more and 10.0 mm or less, and more preferably 1.5 mm or more and 8.0 mm or less. The radius of curvature R of the inner oblique side of the tooth adjacent to the end tooth is preferably 1.0 mm or more and 7.0 mm or less, and more preferably 1.5 mm or more and 6.0 mm or less. By setting each radius of curvature to the above value, the resistance to cutting due to the vicinity of the bottom of the connecting side being caught by the package 50 during cutting is reduced, the package 50 can be cut more easily, and the confluence of film breaks. By making the traveling direction of the notch generated in the package 50 closer to the width direction of the package 50, it is possible to make it difficult for vertical tears to occur when the package that has been rewound is restored (during restoration).

Further, in the present embodiment, the arc connecting the outer hypotenuse of one end tooth and the inner hypotenuse of the adjacent end tooth on the outside of the end tooth is the radius of curvature (R2). Is 0.3 mm or more and 1.3 mm or less. When the radius of curvature (R2) is 0.3 mm or more, it is possible to make it difficult for a notch to occur at the confluence of fractures. When the radius of curvature (R2) is 1.3 mm or less, the package 50 is less likely to be caught in the arc at the initial stage of the end cut or the final cut of the center cut, and the package 50 can be cut more easily. be able to. From the above viewpoint, the preferable range of the radius of curvature R2 is 0.4 mm or more and 1.2 mm or less, and the more preferable range is 0.5 mm or more and 1.2 mm or less.

In the present embodiment, as shown in FIG. 6, for any of the end teeth 232 and the end middle teeth 234 constituting the end area 230, an extension line of the inner oblique side of the end teeth is extended. Assuming that the point where the extension line of the outer oblique side of the end tooth adjacent to the inside of the end tooth intersects is the intersection PS, the end large tooth 232 and the end middle tooth 234 constituting the end area 230 are , The intersection PS for all end teeth has a shape located on the root line L1. Further, for all the end teeth of the large end tooth 232 and the middle end tooth 234 constituting the end area 230, the tip of the end tooth and the tip of the end tooth adjacent to the outside of the end tooth The connecting side connecting the two has a shape parallel to the tooth valley line L2 and in contact with a straight line different from the tooth valley line L2 (hereinafter, also simply referred to as “tooth valley line L2''”). However, the large end tooth 232 and the middle end tooth 234 do not have to have the above contact points on the same tooth valley line L2'' for all teeth, and a plurality of tooth valley lines are set in the end area 230. You may. In the present embodiment, the tooth valley line L2 ″ is located between the tooth valley line L2 and the tooth bottom line L1 (see FIG. 6). Further, the virtual straight line connecting the tooth tips of the end large tooth 232 is the same straight line as the large tooth line L4, and the virtual straight line connecting the tooth tips of the end middle tooth 234 is the same straight line as the middle tooth line L3. The position of the virtual straight line connecting the tooth tips of the large end teeth 232 is not particularly limited, and may be a straight line at a position higher than the middle tooth line L3. Further, the position of the virtual straight line connecting the tooth tips of the end middle teeth 234 is not particularly limited, and if it is the same straight line as the middle tooth line L3 or a straight line higher than the small tooth line L5 and lower than the large tooth line L4. good.

[Second Embodiment]
FIG. 7 is a front view showing a schematic configuration of the cutting blade 300 according to the second embodiment of the present invention. Similar to the cutting blade 200 in the first embodiment, the cutting blade 300 has a central area 310, a pair of side areas 320 arranged outside the central area 310, and a cutting blade 300 outside the side area 320. It has a pair of end areas 330 arranged at the ends. The cutting blade 300 according to the present embodiment is different from the cutting blade 300 in the first embodiment only in the shape of the teeth constituting the side area 320 and the end area 330. Therefore, the description of the common points with the cutting blade 300 in the first embodiment will be omitted below.

As will be described later, in the present embodiment, the cutting blade 300 includes a central area 310, a side area 320 (side connection area 320a and a side main area 320b), and an end area 330 (end connection area 330a and end). It has a main main area 330b). The central area 310 is in the range of 5 to 20% of the total width in the width direction of the cutting blade 300, and the side connection area 320a is the length of the total width in the width direction of the cutting blade 300 outside the central area 310. The side main area 320b is in the range of 10 to 20% of the total width in the width direction of the cutting blade 200 outside the side connection area 320a, and is in the range of 35 to 50% of the total width at the end. The connection area 330a is a range of 5 to 10% of the total width in the width direction of the cutting blade 300 outside the side main area 320b, and the end main area 330b is outside the end connection area 330a. , The range is 10 to 25% of the total width of the cutting blade 300 in the width direction.

In the present embodiment, the configuration having the central area 310, the side area 320, and the end area 330 will be described, but the configuration does not have the end area 330 and is composed of the central area 310 and the side area 320. There may be. In that case, the central area 310 is in the range of 20 to 30% of the total width in the width direction of the cutting blade 300, and the side area 320 is outside the central area 310 in the width direction of the cutting blade 300. It ranges from 70 to 80% of the total width.

(Central area)
The central area 310 includes a plurality of central large teeth 312 having the highest tooth height, a plurality of central middle teeth 314 having a tooth height smaller than that of the central large tooth 312, and a central small tooth 316 having a tooth height smaller than that of the central middle tooth 314. Have. Since these central teeth are the same as those in the first embodiment, detailed description thereof will be omitted.

(Side area)
As shown in FIG. 7, in the present embodiment, the side area 320 has a side connection area 320a which is a connection area with the central area 310 and a side main area 320b having a plurality of outward teeth.

FIG. 8 is a partially enlarged view of the region S in FIG. 7, showing the teeth forming the vicinity of the boundary between the central area 310 and the side area 320 (side connection region 320a). FIG. 9 is a partially enlarged view of the region T in FIG. 7, showing the teeth forming the vicinity of the boundary between the side connection region 320a and the side main region 320b.

The side connection region 320a includes a plurality of side teeth 322a having the same tooth height, and the plurality of side teeth 322a are all upward teeth. The side connection region 320a composed of the plurality of upward teeth is a side main region in which the cutting of the package 50 can be easily proceeded with the central area 310 composed of the upward teeth and the tooth height is the same. It is easy to proceed with cutting of the package 50 even with 320b. Therefore, the side connection area 320a facilitates the cutting of the package 50 by the central cut from the central area 310 to the side main area 320b, and the cutting of the package 50 by the end cut is performed by the side main area 320b. To facilitate progress from to the central area 310.

Each of the plurality of side teeth 322a constituting the side connection region 320a has one or the inner hypotenuse of the lateral tooth and the outer hypotenuse of the side tooth adjacent to each other. It is connected via a plurality of arcs without having a refraction point. As a result, the cutting blade is less likely to be caught in the package 50 when the package 50 is cut, and vertical tearing is less likely to occur, so that recovery at the time of rewinding becomes easier.

Further, also in the present embodiment, the arc connecting the outer hypotenuse of the side tooth 322a and the inner hypotenuse of the adjacent side tooth on the outside of the side tooth is any side tooth (external tooth and The radius of curvature (R1') of both the upward teeth) is 0.3 mm or more and 1.3 mm or less. When the radius of curvature (R1') is 0.3 mm or more, vertical tears are less likely to occur at the confluence of fractures, and recovery at the time of rewinding can be performed more easily. When the radius of curvature (R1') is 1.3 mm or less, the package 50 is less likely to be caught in the arc, and cutting can be performed more easily in both the center cut and the edge cut. From the above viewpoint, the preferable range of the radius of curvature R1'is 0.35 mm or more and 1.2 mm or less, and the more preferable range is 0.35 mm or more and 1.0 mm or less.

The side main region 320b includes a plurality of side teeth 322b having the same tooth height, and the plurality of side teeth are all outward teeth. Similar to the side area 220 in the first embodiment, the side main region 320b having a plurality of outward teeth is easy to insert the side teeth into the package 50, particularly at the time of edge cutting, and the package 50 is on the side. Diagonal cutting due to skidding with respect to the partial teeth is unlikely to occur.

Of the plurality of side teeth 322b possessed by the side main region 320b, the side teeth (side connecting teeth 322c) arranged on the side closest to the side connecting region 320a have a tooth width of the side connecting region. It is smaller than the side teeth 322a of the 320a and the other side teeth 322b of the side main region 320b. Such side connecting teeth 322c have a role of bridging the cutting between the side connecting region 320a mainly composed of the upward teeth and the side main region 320b composed of the outward teeth, and the packaging in the region. Can suppress skidding of objects.

Also in the present embodiment, as shown in FIG. 9, one of the side teeth (extroverted side teeth 322b or side connecting teeth 322c) arranged in the side main region 320b is designated as T1 and the side portion. An adjacent tooth arranged adjacent to the outside of the tooth T1 is referred to as T2, and an adjacent tooth arranged adjacent to the inside of the side tooth T1 is referred to as T3. Further, as shown in FIG. 9, the point where the extension line of the outer hypotenuse of the side tooth T1 and the extension line of the inner hypotenuse of the adjacent tooth T2 intersect is defined as the intersection S1 and the inner hypotenuse of the side tooth T1. The point where the extension line and the extension line of the outer hypotenuse of the adjacent tooth T3 intersect is defined as the intersection S2.

Further, in the present embodiment, a perpendicular line hung from the tip of the side tooth T1 with respect to a virtual straight line connecting the intersection S1 and the intersection S2 (also in this embodiment, the same straight line as the tooth bottom line L1). However, the point where the virtual straight line (tooth bottom line L1) intersects is defined as the intersection S3. Further, the distance between S1 and S3 is D1, and the distance between S1 and S2 is D2. At this time, in the side area 320, the ratio of D1 and D2 satisfies the following equation 1.
D1 / D2 = 0.20 or more and 0.40 or less ... (Equation 1)

When D1 / D2 is 0.40 or less, the tip of the side tooth T1 (outward tooth) faces more outward, so that the side tooth T1 is inserted into the package 50 with less stress at the time of edge cutting. This allows the cutting of the package 50 to proceed easily. Therefore, it is possible to suppress the occurrence of diagonal cutting due to the side teeth T1 not being sufficiently pierced into the package 50 at the time of edge cutting and the package 50 skidding with respect to the side teeth. When D1 / D2 is 0.20 or more, the tip of the side tooth T1 (outward tooth) does not face too outward, so that the cutting progress of the package 50 started in the central area 210 at the time of the central cut. Is less likely to be blocked by the side teeth T1 and the cutting is more likely to proceed in the end direction. Further, this makes it possible to suppress the occurrence of diagonal cutting at the time of edge cutting. A more preferable range that can be cut well from either the edge cut or the center cut is D1 / D2 = 0.25 or more and 0.38 or less, and a more preferable range is D1 / D2 = 0.26 or more and 0.37 or less. ..

Also in the present embodiment, the plurality of side teeth (extrovert teeth) constituting the side main region 320b are adjacent to the outer hypotenuse of the side teeth (extrovert teeth) on the outside of the side teeth. The inner hypotenuse of the lateral tooth (extroverted tooth) is connected via one or more arcs without having an inflection point. As a result, the cutting blade is less likely to be caught in the package 50 when the package 50 is cut, and vertical tearing is less likely to occur, so that recovery at the time of rewinding becomes easier.

Further, also in the present embodiment, the arc connecting the outer hypotenuse of the side tooth T1 and the inner hypotenuse of the adjacent tooth T2 has a radius of curvature (R1) of 0.3 mm for any of the side teeth. It is 1.3 mm or more and 1.3 mm or less. When the radius of curvature (R1) is 0.3 mm or more, vertical tears are less likely to occur at the confluence of fractures, and recovery at the time of rewinding can be performed more easily. When the radius of curvature (R1) is 1.3 mm or less, the package 50 is less likely to be caught in the arc, and cutting can be performed more easily in both the center cut and the edge cut. From the above viewpoint, the preferable range of the radius of curvature R1 is 0.35 mm or more and 1.2 mm or less, and the more preferable range is 0.35 mm or more and 1.0 mm or less.

Further, also in the present embodiment, the radius of curvature R of the outer oblique side of the side tooth T1 is preferably 1.0 mm or more and 10.0 mm or less, and more preferably 1.5 mm or more and 8.0 mm or less. .. The radius of curvature R of the inner oblique side of the adjacent tooth T2 is preferably 1.0 mm or more and 7.0 mm or less, and more preferably 1.5 mm or more and 6.0 mm or less. By setting each radius of curvature to the above value, the resistance to cutting due to the vicinity of the bottom of the connecting side being caught by the package 50 at the time of cutting is reduced, the package 50 can be cut more easily, and the merging of breaks. Vertical tears are less likely to occur at the points, and recovery at the time of rewinding can be performed more easily.

In the present embodiment, the virtual straight line parallel to the tooth bottom line L1 that is in contact with the connecting side connecting the tooth tip of the side tooth T1 and the tooth tip of the adjacent tooth T2 is a tooth valley parallel to the tooth valley line L2'. It is a straight line different from the line L2'(tooth valley line L2a and tooth valley line L2b). Also in this embodiment, the tooth valley line L2a and the tooth valley line L2b are located between the tooth valley line L2'and the small tooth line L5. Further, the tooth valley line L2a when the plurality of side teeth constituting the side connection region 320a are the side teeth T1 and the adjacent teeth T2, and the plurality of side teeth constituting the side main region 320b are side portions. The tooth valley line L2b when the tooth T1 and the adjacent tooth T2 are used are different straight lines parallel to each other. In the present embodiment, the tooth valley line L2b is located between the tooth valley line L2a and the tooth valley line L2'. On the other hand, with respect to the plurality of side teeth 322a constituting the side connection region 320a, the extension line of the inner oblique side of the side tooth 322a and the outer oblique side of the side tooth adjacent to the inside of the side tooth 322a. The intersection with the extension line of is located on a straight line (tooth bottom line L1') parallel to the tooth bottom line L1 and different from the tooth bottom line L1. In the present embodiment, the tooth bottom line L1'is located between the tooth valley line L2'and the tooth valley line L2. Further, the virtual straight line connecting the tooth tips of the side tooth 322a, the side tooth 322b and the side connecting tooth 322c is the same straight line as the middle tooth line L3. The position of the virtual straight line connecting the tips of these side teeth is not particularly limited, and may be the same straight line as the small tooth line L5 or a straight line higher than the small tooth line L5 and lower than the large tooth line L4. Just do it. In addition, in FIGS. 8 and 9, the tooth tips of all the side teeth are located on the middle tooth line L3, but the tooth tips of all the side teeth are the same virtual straight line (in FIGS. 8 and 9). It does not have to be located on the middle tooth line L3). In other words, the side area 320 may have a plurality of side teeth having different distances from the bottom line L1 to the tooth tips of the side teeth.

(End area)
As shown in FIG. 7, in the present embodiment, the end area 330 has an end connection area 330a, which is a connection area with the side area 320 (side main area 320b), and an end having a plurality of outward teeth. It has a main region 330b and.

FIG. 10 is a partially enlarged view of the region U in FIG. 7, showing the teeth constituting the end connection region 330a and the end main region 330b.

The end connection region 330a includes a plurality of end teeth having different tooth heights, and the plurality of end teeth are all outward teeth. Further, the plurality of end teeth are arranged so that the tips of the three consecutive end teeth are not located on the same straight line. Specifically, the end connection region 330a includes a plurality of connecting middle teeth 336 having the same tooth height as the side teeth 322b of the side main region, and the ends of the connecting middle teeth 336 and the end main region 330b. It has a plurality of connecting large teeth 338 that are the tooth height between the large teeth 332. The connecting middle tooth 336 and the connecting large tooth 338 are alternately arranged. Further, the virtual straight line connecting the tooth tips of the connecting middle tooth 336 is the same straight line as the middle tooth line L3, and the virtual straight line L6 connecting the tooth tips of the connecting large tooth 338 is higher than the middle tooth line L3 and the large tooth line L4. It is a straight line at a lower position.

The end connection region 330a has a plurality of end teeth having different tooth heights so that the package 50 can be cut from the side main region 320b having a lower tooth height to the end main region 330b having a higher tooth height. (Or from the end main area 330b to the side main area 320b).

The end main region 330b is composed of a plurality of large end teeth 332 and a plurality of middle end teeth 334, as in the first embodiment. However, in the present embodiment, both the large end tooth 332 and the middle end tooth 334 are extrovert teeth. In such an end area 330, the end teeth are easily inserted into the end cut, and the package 50 is less likely to be cut diagonally due to skidding with respect to the end teeth.

Further, as shown in FIG. 10, the end tooth (the end middle tooth 334 in FIG. 10), which is one outward tooth of the end main region 330b, is designated as T4, and is arranged adjacent to the outside of the end tooth T4. The adjacent tooth is T5 (large end tooth 332b in FIG. 10), and the adjacent tooth arranged adjacent to the inside of the end tooth T4 is T6 (large end tooth 332a in FIG. 10). Further, as shown in FIG. 10, the point where the extension line of the outer hypotenuse of the end tooth T4 and the extension line of the inner hypotenuse of the adjacent tooth T5 intersect is defined as the intersection S4, and the inner hypotenuse of the end tooth T4. The point where the extension line and the extension line of the outer hypotenuse of the adjacent tooth T6 intersect is defined as the intersection S5.

At this time, the perpendicular line drawn from the tip of the end tooth T4 with respect to the virtual straight line connecting the intersection S4 and the intersection S5 (in the present embodiment, the same straight line as the tooth bottom line L1) is the above virtual straight line (the above-mentioned virtual straight line (the same straight line as the tooth bottom line L1). The point that intersects the tooth bottom line L1) is designated as the intersection S6. Further, the distance between S4 and S6 is D3, and the distance between S4 and S5 is D4. At this time, the ratio of D3 and D4 satisfies the following equation 2.
D3 / D4 = 0.35 or more and less than 0.50 ... (Equation 2)

When D3 / D4 is less than 0.50, the tips of the outward teeth of the end area 330 face outward, so that the end teeth can be inserted into the package 50 with less stress at the time of end cutting. Therefore, the cutting of the package 50 can be easily proceeded. Therefore, it is possible to suppress the occurrence of diagonal cuts due to the end teeth not being sufficiently pierced into the package 50 and the package 50 skidding with respect to the end teeth. When D3 / D4 is 0.35 or more, the tips of the outward teeth of the end area 330 do not face too outward, so that the cutting of the package 50 started in the central area 310 at the time of the central cut ends. It is less likely to be hindered by the outward teeth of the portion area 330, making it easier for the cutting to proceed more smoothly to the end of the package 50. A more preferable range that can be cut well from either the edge cut or the center cut is D3 / D4 = 0.37 or more and 0.495 or less, and a more preferable range is D3 / D4 = 0.40 or more and 0.49 or less. .. Further, it is preferable that the value of D3 / D4 for the outward teeth of the end main region 330b is larger than the value of D1 / D2 for the outward teeth of the side main region 320b.

In this way, by making the D3 / D4 of the outward teeth of the end main region 330b larger than the D1 / D2 of the outward teeth of the side main region 320b, the end teeth are attached to the package 50 at the time of end cutting. Can be more easily inserted, and the occurrence of diagonal cuts at the time of edge cutting can be suppressed more effectively.

Also in this embodiment, the virtual straight line parallel to the tooth bottom line L1 in which the connecting side connecting the end tooth T4 and the adjacent tooth T5 is in contact is the same straight line as the tooth valley line L2 ″.

In addition, D3 / D4 when the connecting middle tooth 336 or the connecting large tooth 338 included in the end connecting region 330a is similarly defined as the end tooth T4 is also the end large tooth 332 or the end middle tooth possessed by the end main region 330b. It is preferable that 334 is within the same range as D3 / D4 when defined as the end tooth T4. However, at this time, with respect to D3 / D4 of the connecting middle tooth 336a and the connecting large tooth 338a arranged on the side main area 320b side of the end connecting area 330a, the end main area of the end connecting area 330a By making the D3 / D4 of the connecting middle tooth 336b and the connecting large tooth 338b arranged on the 330b side larger (closer to the outward tooth D3 / D4 of the end main region 330b), the packaging 50 can be cut. A smooth transition can be made from the side main area 320b to the end area 330 (or from the end area 330 to the side main area 320b).

At this time, D1 / D2 of the outward teeth in the side main region 320b, D3 / D4 of the outward teeth in the end connection region 330a, and D3 / D4 of the outward teeth in the end main region 330b increase in this order. It is preferable to continue.

The end teeth constituting the end area 330 (end connection area 330a and end main area 330b) are all adjacent end teeth on the outer hypotenuse of the end tooth and on the outside of the end tooth. The inner hypotenuse is connected via one or more arcs without a refraction point. As described above, when the hypotenuses of the respective end teeth are connected via an arc, vertical tearing is less likely to occur at the confluence of fractures, and recovery at the time of rewinding can be performed more easily.

Also in the present embodiment, the radius of curvature (R2) of each of the above arcs connecting the outer hypotenuse of one end tooth and the inner hypotenuse of the adjacent end tooth on the outside of the end tooth has a radius of curvature (R2). It is 0.3 mm or more and 1.3 mm or less. When the radius of curvature (R2) is 0.3 mm or more, it is possible to make it difficult for a notch to occur at the confluence of fractures. When the radius of curvature (R2) is 1.3 mm or less, the package 50 is less likely to be caught in the arc at the initial stage of end cutting or the final cutting of the central cut, and cutting can be performed more easily. From the above viewpoint, the preferable range of the radius of curvature R2 is 0.4 mm or more and 1.2 mm or less, and the more preferable range is 0.5 mm or more and 1.2 mm or less.

Regardless of which end tooth is the end tooth T4, the radius of curvature R of the outer hypotenuse of the end tooth T4 is preferably 1.0 mm or more and 10.0 mm or less, and 1.5 mm or more and 8 More preferably, it is 0.0 mm or less. The radius of curvature R of the inner oblique side of the adjacent tooth T5 is preferably 1.0 mm or more and 7.0 mm or less, and more preferably 1.5 mm or more and 6.0 mm or less. When the outer diagonal sides of the end teeth T4 are connected by an arc, the radius of curvature R of the connected arcs is the radius of curvature R of the outer slopes of the end teeth T4 and the radius of curvature of the inner slopes of the adjacent teeth T5. It is preferably a value smaller than any of R, and is preferably 0.2 mm or more and 2.0 mm or less, and more preferably 0.4 mm or more and 1.2 mm or less. By setting each radius of curvature to the above value, the resistance to cutting due to the vicinity of the bottom of the connecting side being caught by the package 50 during cutting is reduced, the package 50 can be cut more easily, and the confluence of film breaks. By making the traveling direction of the notch generated in the package 50 closer to the width direction of the package 50, it is possible to make it difficult for vertical tears to occur when the package that has been rewound is restored (during restoration).

[Third Embodiment]
FIG. 11 is a perspective view schematically showing the configuration of the packaging container 20 according to the third embodiment of the present invention when the lid is closed.

The packaging container according to the present embodiment is different from the packaging container according to the first embodiment or the second embodiment in that the central area 410, the side area 420, and the end area 430 have a linear cutting blade 400. The shape of the teeth of each of the central area 410, the side area 420, and the end area 430 may be the same as that of the first embodiment or the second embodiment.

In the present embodiment, the tip 125 of the cover piece 124 and the cutting blade 400 have a linear shape. Specifically, the cutting blade 400 has a plurality of teeth arranged from the center of the cutting blade 400 toward both ends. The plurality of teeth are arranged so that the tooth bottom line L1, the tooth valley line L2, the small tooth line L5, the middle tooth line L3, and the large tooth line L4 set on the cutting blade 400 are all straight lines. NS.

According to the packaging container 20 according to the present embodiment, when the end is cut, the outward teeth arranged in the side area opposite to the end on the side where the cut is started do not easily hinder the progress of the cut, so that the end is cut. Can be done more easily.

[Fourth Embodiment]
FIG. 12 is a perspective view schematically showing the configuration of the packaging container 30 according to the fourth embodiment of the present invention when the lid is closed.

The packaging container according to the present embodiment is the same as the packaging container according to the first embodiment or the second embodiment in that the central area 510, the side area 520, and the end area 530 all have a bending blade 500. Is different. The shape of the teeth of each of the central area 510, the side area 520, and the end area 530 may be the same as that of the first embodiment or the second embodiment.

In the present embodiment, the tip 125 of the lid piece 124 and the cutting blade 500 have a substantially M-shaped shape. Specifically, the cutting blade 500 has a plurality of teeth arranged from the center of the cutting blade 500, which is also the apex of a substantially M-shape, toward both ends. The plurality of teeth are the packaging container when the above-mentioned tooth bottom line L1, tooth valley line L2, small tooth line L5, middle tooth line L3, large tooth line L4 and the like are installed in the packaging container 30. The teeth are arranged so as to form a convex curve in the direction from the bottom plate 118 to the lid 120.

According to the packaging container 30 according to the present embodiment, since the teeth of the end area 530 can be projected further downward, the teeth of the end area 530 can be easily inserted into the package 50 at the initial stage of the end cut, and the end cut can be made. Can be done more easily. On the other hand, according to the packaging container 30 according to the present embodiment, as in the first embodiment and the second embodiment, the central area 510 is arranged so as to protrude from the side area 520, so that the central area is cut. In the initial stage, the teeth of the central area 510 can be easily inserted into the package 50, and the central cut can be performed more easily.

The shape of the cutting blade 500 is not limited to the substantially M shape, and for example, each of the above lines may be arranged so as to be curved only in the side area 520.

[Effect confirmation test]
Five resin cutting blades having a central area and an outer area (side area and end area) were prepared. Each cutting blade has an outward tooth, D1 / D2 or D3 / D4 for the outward tooth, and the shape of the tooth valley (whether it has an inflection point or is connected by an arc without an inflection point). , And the radius of curvature of the arc when the tooth valleys are connected by the arc, were different.

For the five cutting blades used in the effect confirmation test, the shape of the central area is shown in Table 1, the shape of the side area is shown in Table 2, and the shape of the end area is shown in Table 3. Regarding D1 / D2, D3 / D4, radius of curvature Rc, radius of curvature R1 and radius of curvature R2, when each area contains teeth having a plurality of different shapes, D1 / D2 and D3 / D4 are each. All values in the area are shown, and the lower and upper limits are shown for the radius of curvature Rc, the radius of curvature R1 and the radius of curvature R2, respectively.

The following tests-1 to test-3 were performed using cutting blades-1 to 5 joined to packaging containers having the shapes shown in FIGS. 1 and 2, respectively.

(Test-1: Ease of edge cutting)
Twenty-five testers, including randomly selected men and women, cut a film of polyvinylidene chloride that was wound and contained in a packaging container by edge cutting. Out of 40 cuts by each tester, the number of diagonal cuts was measured, and the ease of edge cutting was evaluated according to the following criteria.
◎ 70% or more of the total testers had no diagonal cuts. ○ 50% or more and 69% or less of the total testers had no diagonal cuts. △ The number of examiners who did not have a single diagonal cut was 30% or more and 49% or less of the total examiners. × The number of examiners who did not have a single diagonal cut was 29% or less of the total examiners. was

(Test-2: Recovery rate)
The film made of polyvinylidene chloride, which was wound and contained in the packaging container, was unwound 30 cm from the container, and the wrap film was cut so that the blade mold remained on the wrap film with the lid tightly closed. Then, the remaining wrap film was rewound inside the container with as few wrinkles as possible, and the end portion of the wrap film was brought into close contact with the wound wrap film.

From this state, 50 randomly selected testers were allowed to pull the entire width of the wrap film out of the containment box without using any tools such as tape to prevent vertical tearing. Of the recovery by 50 testers, the number of people who could pull out the entire width to the outside of the storage box within 2 minutes was measured, and the probability was taken as the recovery rate.

(Test-3: Cutting force required for central cutting)
A packaging container containing a wound polyvinylidene chloride film was placed in a measuring instrument equipped with a push-pull gauge, and the film was unwound by 30 cm and fixed to a fixing jig of the measuring instrument. In this state, while fixing the packaging container so that the lid (cover piece) of the packaging container does not separate from the film, the rotation speed of 90 ° per second is such that the entire cutting blade is uniformly pressed against the film. The packaging container was rotated around the winding shaft of the wound film. At this time, the maximum value of the rotational force required to cut the film was measured 5 to 10 times, and the average of these was taken as the cutting force required for the central cut.

The results of Test-1 to Test-3 for each cutting blade are shown in Table 4.

As is clear from the results in Table 4, the extrovert teeth are provided only in the external area (side area or end area), and an arc is formed between the extrovert teeth and the adjacent teeth arranged adjacent to the extrovert teeth. When connected by, the recovery rate when rewinding was higher.

Further, when D1 / D2 is 0.20 or more and 0.40 or less, cutting is easy in both the edge cut and the center cut, and even if D3 / D4 is 0.35 or more and less than 0.50. , Both the edge cut and the center cut facilitated cutting.

[Other Embodiments]
It should be noted that the above-described embodiment is merely an example of the embodiment of the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from its gist or its main features.

For example, the central area, side area (side connection area and side main area), and end area (end connection area and end main area) are the radius of curvature, D1 / D2 or D3 / D4, respectively. May have a plurality of different teeth.

For example, in each of the above embodiments, the radius of curvature Rc is included in the above range for all the central teeth arranged in the central area, but the radius of curvature Rc may be included in the above range for any one of the central teeth. .. However, it is preferable that the radius of curvature Rc is included in the above range for at least half or more of the central teeth, and it is more preferable that the radius of curvature Rc is included in the above range for all the central teeth.

Further, in each of the above embodiments, the radius of curvature R1 is included in the above range for all the outward teeth arranged in the side area, but if the radius of curvature R1 is included in the above range for any one of the outward teeth. good. However, it is preferable that the radius of curvature R1 is included in the above range for at least half or more of the outward teeth, and it is more preferable that the radius of curvature R1 is included in the above range for all the outward teeth.

Further, in each of the above embodiments, the radius of curvature R2 is included in the above range for all the end teeth arranged in the end area, but the radius of curvature R2 is included in the above range for any one of the end teeth. It should be done. However, it is preferable that the radius of curvature R2 is included in the above range for at least half or more of the end teeth, and it is more preferable that the radius of curvature R2 is included in the above range for all the end teeth.

Further, in each of the above embodiments, the radius of curvature R of the hypotenuse is included in the above range for all of the central tooth, the side tooth and the end tooth, but any one of the central tooth, the side tooth or the end portion is included in the above range. The radius of curvature R of the tooth may be included in the above range. However, it is preferable that the radius of curvature R of at least half or more of the central tooth, the side tooth and the end tooth is included in the above range, and the radius of curvature R of all the teeth is included in the above range. preferable.

Further, in each of the above embodiments, D1 / D2 is included in the above range for all the outward teeth arranged in the side area, but if D1 / D2 is included in the above range for any one of the outward teeth. good. However, it is preferable that D1 / D2 is included in the above range for at least half or more of the outward teeth, and it is more preferable that D1 / D2 is included in the above range for all outward teeth.

Further, in the second embodiment, D3 / D4 is included in the above range for all the outward teeth arranged in the end area, but D3 / D4 is included in the above range for any one of the outward teeth. I just need to be. However, it is preferable that D3 / D4 is included in the above range for at least half or more of the extroverted teeth, and it is more preferable that D3 / D4 is included in the above range for all the extroverted teeth.

Further, in each of the above embodiments, the central small tooth is arranged in the central area, but the central small tooth may not be arranged.

In any of the above-described embodiments, the cutting blades are polyester, polyethylene, polypropylene, polystyrene, polyacetal, polyphenylene sulfide, polyetheretherketone (PEEK), polyethersulfone (PES), and polylactic acid (PLA). It may be made of resin such as, or it may be made of metal. However, as shown in the effect confirmation test-2, when the cutting blade is made of resin, vertical tearing of the package is more likely to occur. Therefore, the effect of suppressing vertical tearing of the package is remarkable when the cutting blade is made of resin.

Further, in the region of the front plate that faces the cover piece when the lid portion closes the opening, a stopper may be provided for adhering the vicinity of the cut portion of the package to suppress rewinding. .. The stopper may be configured such that, for example, a flap formed by cutting out a part of the front plate is formed on the front plate and is formed on the surface of the flap.

Further, the surfaces of the main body, the lid and the holding plate may be surface-treated by applying and curing an ultraviolet curable varnish in order to improve water resistance and light resistance.

Further, the package may be a long sheet or film wound, and the material thereof is a single layer or a multi-layer made of a resin (polyvinyl chloride, vinyl chloride, polyethylene, polymethylpentene, etc.). It may be (such as film or sheet), paper (such as roll paper, kitchen paper, cooking heating sheet and parchment paper) and metal foil (such as aluminum foil).

This application is an application claiming priority based on Japanese Application No. 2019-051447 filed on March 19, 2019, and the contents described in the claims, specification and drawings of the application are the present. Incorporated in the application.

In the cutting blade of the present invention, the package cut by the reverse rotation of the wound package is rewound inside the main body, and the end portion of the package is attached to the surface of the wound package. When the end portion that has been stuck is restored between the main body portion and the lid portion again, the occurrence of vertical tearing in the package can be suppressed. Therefore, the present invention is expected to enable more comfortable use of packaging containers, promote the use of packaging films and the like for home and business use, and contribute to the development of this field.

10, 20, 30 Packaging container 50 Packaging 100 Storage box 110 Main body 112a, 112b End plate 114 Front plate 116 Rear plate 118 Bottom plate 119 Opening surface 120 Lid 122 Lid plate 124 Cover piece 125, 125a, 125b Tip of the cover piece 126a, 126b Side lid piece 128 connecting part 200, 300, 400, 500 Cutting blade 210, 310, 410, 510 Central area 212, 212a, 212b, 212c, 312 Central large teeth 214, 214a, 214b, 214c, 214d, 314 Central middle tooth 216, 316 Central small tooth 220, 320, 420, 520 Side area 222, 322, 322a, 322b Side tooth 230, 330, 430, 530 End area 232, 232a, 232b, 332, 332a, 332b Large end tooth 234, 234a, 234b, 334 End middle tooth 320a Side connection area 320b Side main area 330a End connection area 330b End main area 322c Side connection tooth 336, 336a, 336b Connection middle tooth 338, 338a, 338b connecting large teeth

Claims (10)

A cutting blade provided along the longitudinal direction of a packaging container for accommodating a roll-shaped package and cutting the package.
It has a central area in which a plurality of teeth are arranged and a pair of external areas in which a plurality of teeth are arranged outside the central area, and only the external area has an outward tooth with a tooth tip facing outward. death,
The external area has the plurality of extroverted teeth and
The hypotenuse on the outside of the outward tooth and the hypotenuse on the inside of the adjacent tooth arranged adjacent to the outside of the outward tooth are connected by an arc.
The radius of curvature of the arc is 0.3 mm or more and 1.3 mm or less.
The plurality of extrovert teeth
A first extrovert tooth with a tooth tip pointing more outward and closer to the central area.
A second extrovert tooth with a tooth tip pointing more upwards and located further away from the central area.
Have,
Cutting blade. The external area has a side area arranged adjacent to the central area and a pair of end areas arranged outside the side area, and the first outward tooth has the side. Located in the department area,
The cutting blade according to claim 1. Let T1 be the first extroverted tooth.
Adjacent teeth arranged adjacent to the outside of the first outward tooth T1 are designated as T2.
The adjacent tooth arranged adjacent to the inside of the first outward tooth T1 is designated as T3.
An intersection S1 is a point where the extension line of the outer hypotenuse of the first outward tooth T1 and the extension line of the inner hypotenuse of the adjacent tooth T2 intersect.
An intersection S2 is a point where the extension line of the inner hypotenuse of the first outward tooth T1 and the extension line of the outer hypotenuse of the adjacent tooth T3 intersect.
When the point where the perpendicular line drawn from the tip of the first outward tooth T1 intersects the tooth bottom line with respect to the tooth bottom line which is a virtual straight line connecting the intersection S1 and the intersection S2 is defined as the intersection S3.
The ratio of the distance D1 between the intersection S1 and the intersection S3 and the distance D2 between the intersection S1 and the intersection S2 satisfies the following equation 1.
D1 / D2 = 0.20 or more and 0.40 or less ... (Equation 1)
The cutting blade according to claim 2. The external area has a side area arranged adjacent to the central area and a pair of end areas arranged outside the side area, and the second outward tooth has the end. Located in the department area,
The cutting blade according to any one of claims 1 to 3. Let the second extrovert tooth be T4.
An adjacent tooth arranged adjacent to the outside of the second outward tooth T4 is designated as T5.
The adjacent tooth arranged adjacent to the inside of the second outward tooth T4 is designated as T6.
An intersection S4 is a point where the extension line of the outer hypotenuse of the second outward tooth T4 and the extension line of the inner hypotenuse of the adjacent tooth T5 intersect.
An intersection S5 is a point where the extension line of the inner hypotenuse of the second outward tooth T4 and the extension line of the outer hypotenuse of the adjacent tooth T6 intersect.
When the point where the perpendicular line hanging from the tip of the second outward tooth T4 intersects the tooth bottom line with respect to the tooth bottom line which is a virtual straight line connecting the intersection S4 and the intersection S5 is defined as the intersection S6.
The ratio of the distance D3 between the intersection S4 and the intersection S6 and the distance D4 between the intersection S4 and the intersection S5 satisfies the following equation 2.
D3 / D4 = 0.35 or more and less than 0.50 ... (Equation 2)
The cutting blade according to claim 4. In the one tooth arranged in the central area, the hypotenuse of the outer side of the one tooth and the hypotenuse of the tooth adjacent to the one tooth are connected by an arc.
The cutting blade according to any one of claims 1 to 5. The radius of curvature (Rc) of the arc connecting the hypotenuse on the outside of the one tooth and the hypotenuse of the tooth adjacent to the one tooth is 0.5 mm or more and 1.3 mm or less.
The cutting blade according to claim 6. The external area is
Has upward teeth with no outward facing teeth,
In the upward tooth, the hypotenuse on the outside of the upward tooth and the hypotenuse of the tooth adjacent to the upward tooth are connected by an arc.
The cutting blade according to any one of claims 1 to 7. The external area has a side area arranged adjacent to the central area and a pair of end areas arranged outside the side area, and the upward tooth has the side area. Placed in
The radius of curvature (R1') of the arc connecting the outer hypotenuse of the upward tooth and the hypotenuse of the tooth adjacent to the upward tooth is 0.3 mm or more and 1.3 mm or less.
The cutting blade according to claim 8. A packaging container having a storage box for storing a roll-shaped package and a cutting blade according to any one of claims 1 to 9 for cutting the package drawn from the storage box.

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