TWI710442B - Cutting blade and packaging container - Google Patents

Abstract

The present invention provides a cutting blade, which is arranged along the length direction of a packaging container containing roll-shaped packaging, and cuts the aforementioned packaging. The cutting blade has a central area in which a plurality of teeth are arranged, and a pair of outer areas with a plurality of teeth arranged on the outer side of the central area, and only the outer area has outer teeth with tooth tips facing the outside. The hypotenuse on the outer side of the outward tooth and the hypotenuse on the inner side of the adjacent tooth arranged adjacent to the outer side of the outward tooth are connected by an arc, and the radius of curvature (R1) of the arc is 0.3 mm or more and 1.3 mm or less. The aforementioned cutting blade is easy to cut the package from the center or from the end in the width direction, and it is easy to restore the package when rewinding.

Description

Cutting blade and packaging container

The invention relates to a cutting blade and a packaging container.

Film-like packaging materials used for food packaging, etc. are wound into a roll and housed in a roughly rectangular parallelepiped packaging container. The packaging container usually has a storage box for storing the packaging, and a saw-shaped cutting blade formed by arranging a plurality of teeth to cut the packaging from the storage box for only the used amount. The storage box has a substantially rectangular parallelepiped main body with an opening surface, and a lid portion that opens and closes the opening surface, and the cutting blade is arranged at an end of the lid portion. The user of the package pulls the end of the package housed in the container to pull the film-like package from the gap between the main body and the lid, and closes the lid and uses the aforementioned cutting blade The package sandwiched between the main body part and the cover part is cut, and the used package can be taken out of the packaging container.

As a cutting method of the package drawn from the packaging container, the following method is known: the method of turning the packaging container to cut the package from the center (hereinafter also referred to as "central cutting"); And a method of cutting from the width direction end of the package by holding the width direction end of the package and twisting it relative to the packaging container (hereinafter, this cutting method is also referred to as "end cutting"). Patent Document 1 and Patent Document 2 describe a packaging container having a cutting blade that can be easily cut from the center by setting the cutting blade in a V shape, and on the other hand, by placing the cutting blade on the side The area is equipped with teeth with tooth tops facing outward (hereinafter also referred to as "outward teeth". In addition, the tooth tops do not face outwards but face the bottom of the packaging container when the lid is closed). In the drawings described later, it faces upward in the figure, so it is also simply referred to as "upward teeth" hereinafter) and it is easy to cut from the widthwise end.

In addition, this kind of packaging container has the following situation: the package cut by the reverse rotation of the wrapped package is rolled back to the inside of the main body, causing the end of the package to stick to the wrapped package的面。 The surface. Moreover, it is known that when the above-mentioned attached end is restored between the main body and the cover (hereinafter also referred to as "recovery"), a tear (vertical crack) of the package in the winding direction will occur. . It is believed that the mechanism of the longitudinal cracking is as follows. That is, when the tooth tips of adjacent teeth pierce into the package and the rupture of the package starting from each tooth tip merges, because the rupture started from one of the adjacent teeth is excessively advanced, it will be generated at the confluence point of the rupture Gaps (rips). Moreover, if the stress applied to the package is concentrated on the aforementioned notch by tearing off from the wrapped package, etc., a new rupture with the notch as the starting point will occur, resulting in longitudinal cracks.

Patent Document 3 describes a cutting blade in which a plurality of teeth with different tooth heights are alternately arranged, and the opposing hypotenuses of adjacent teeth are connected by an arc. According to Patent Document 3, when the distance between the intersection of the extension line of the opposing hypotenuse and the arc is set as the "smooth distance", the intersecting point of the extension of the opposing hypotenuse is connected to multiple teeth with the same height When the distance between the straight lines of the tooth tips is set as the "1st distance" and "2nd distance" according to each tooth height, the ratio of the smoothing distance to the first distance and the smoothing distance to the second distance The ratios are in the specified range, and longitudinal cracking is suppressed. Known technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open No. 2009-83917 Patent Document 2 Japanese Patent Laid-Open No. 2010-120656 Patent Document 3 Japanese Patent Laid-Open No. 2009-132406

The problem to be solved by the invention The cutting blades described in Patent Document 1 and Patent Document 2 use outward teeth to make it easier to cut the package from the end in the width direction. In addition, the dicing blade system described in Patent Document 3 is less likely to cause longitudinal cracks, so restoration becomes easy.

However, according to the findings of the inventors, even with the cutting blades described in Patent Document 1 and Patent Document 2, when cutting from the end in the width direction, unplanned cutting of the package in the oblique direction occurs. (Mitered) situation. It is believed that the reason is that even with the outward teeth described in Patent Document 1 and Patent Document 2, when cutting from the width direction end, the end teeth do not sufficiently penetrate the package, causing the package to slide laterally .

In addition, according to the findings of the inventors, even with the cutting blade described in Patent Document 3, cracks in the package body during restoration are not completely suppressed, so that it is difficult to restore the package body during rewinding so that it does not occur. The cracked situation.

The present invention was made in view of the foregoing problems, and its object is to provide a cutting blade and a packaging container having the cutting blade, which can easily cut the package from the center or from the end in the width direction, and when rewinding The restoration becomes easy. Technical means to solve the problem

One aspect of the present invention for solving the aforementioned problems relates to a cutting blade which is provided along the length direction of a packaging container containing a roll-shaped package and cuts the aforementioned package. The cutting blade has a central area in which a plurality of teeth are arranged, and a pair of outer areas with a plurality of teeth arranged on the outer side of the central area, and only the outer area has outer teeth with tooth tips facing the outside. The hypotenuse on the outer side of the outward tooth and the hypotenuse on the inner side of the adjacent tooth arranged adjacent to the outer side of the outward tooth are connected by an arc, and the radius of curvature (R1) of the arc is 0.3 mm or more and 1.3 mm or less.

In addition, another aspect of the present invention relates to a packaging container having a storage box for storing roll-shaped packages, and the cutting blade for cutting the package drawn from the storage box. Invention effect

According to the present invention, there is provided a cutting blade and a packaging container having the cutting blade. The cutting blade can easily cut a package from the center or from the end in the width direction, and easy to restore during rewinding.

[First Embodiment] (Packaging container)

1 is a perspective view schematically showing the structure of a packaging container 10 according to one embodiment of the present invention when the lid is closed, and FIG. 2 is a perspective view schematically showing the structure of the packaging container 10 when the lid is opened.

The packaging container 10 has a storage box 100 and a cutting blade 200, and the storage box 100 contains a package 50 formed by winding a strip of packaging film or the like around a core in a roll shape so that it can be withdrawn.

The storage box 100 has a main body 110 for storing the package 50 and a cover 120 rotatably connected to the main body 110. The main body 110 and the cover 120 are integrally formed by folding a sheet of thick paper.

In addition, in the following description, the "width direction" refers to the direction along the winding axis of the package to be wound and the direction in which the core of the package extends. In addition, the term "winding direction" refers to the direction orthogonal to the width direction of the packaged material and is the direction from the side of the drawn end portion to the core approaching when used. In addition, the term "end" refers to the end in the width direction of the cutting blade, the so-called "outside", and the cutting blade refers to the direction from the center to the end in the arrangement direction of the teeth, the so-called "inner" , For the cutting blade, it refers to the direction from the end side to the center side in the direction in which the teeth are arranged.

In addition, in the following description, the "upper end" refers to the end of the front plate 114 and the rear plate 116 on the opposite side to the bottom plate 118, and the "both ends" refers to the case where the packaging container 10 is arranged such that the front plate 114 becomes the front face. The left and right ends of the components of the packaging container.

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 is a substantially rectangular parallelepiped box, which is formed by bending the end plates 112a and 112b around the bottom plate 118 and the front plate 114 and the rear plate 116 in the same direction relative to the bottom plate 118 in the expanded view. The main body 110 has an opening surface 119 on the upper surface side opposite to the bottom plate 118.

The cover 120 is rotatably connected to the rear plate 116 by bending the extension part extending from the upper end of the rear plate 116 to the front plate 114 side along the connecting part 128 with the rear plate 116. The cover 120 has a cover 122, a cover sheet 124, and a pair of side cover sheets 126a and 126b. The cover 120 is formed by bending the cover sheet 124 and the side cover sheets 126a and 126b arranged around the cover plate 122 in the expanded view in the same direction with respect to the cover plate 122.

The cover 122 is a substantially rectangular plate-shaped member having substantially the same shape and size as the opening surface 119, and by rotating along the aforementioned connecting portion 128, the opening surface 119 is opened and closed. The cover sheet 124 is a plate-shaped member, which is formed by bending an extension part extending from the front end of the cover 122 toward the side of the bottom plate 118 when the opening surface 119 is closed to the cover 122, thereby being connected to the cover 122 , And is arranged at a position where the cover 122 closes the opening surface 119 and covers the upper end area of the front plate 114.

The cover piece 124 has a shape in which the length from the front end of the cover plate 122 to the front end 125a of the cover piece 124 becomes longer from both ends of the front end of the cover plate 122 toward the center. Thereby, the front end 125 of the cover piece 124 becomes a substantially V shape toward 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, the cover piece 124 has a shape in which the length from the front end of the cover plate 122 in the center portion to the front end 125a of the cover piece 124 becomes approximately 3/4 of the length of the short side of the front plate 114. The length of the front end from the front end of the end to the front end 125b of the cover piece 124 becomes approximately 1/2 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 front end 125 of the masking sheet 124. For example, it is bonded by ultrasonic bonding via a sealant and an adhesive, and then arranged in the masking sheet 124 along the length direction to become the front end 125. The position of the inner side.

The packaging container 10 is stored in a state where the lid 120 closes the opening surface 119 and the cover piece 124 covers the front plate 114 facing the front plate 114. At this time, the front end of the package 50 housed in the main body 110 is drawn out from the opening surface 119 and contacts the front plate 114. The user of the package 50 holds the front end of the packaging film or the like as the package 50 with the lid 120 slightly opened and only draws out the usage amount, then closes the lid 120 and uses the cutting blade 200 to remove the package 50 cut off. At this time, by pressing the central part of the cover sheet 124 with the thumb while pressing the cover sheet 124 against the front plate 114, while rotating the packaging container 10 downwards, the cutting blade 200 can be used for packaging of the package 50 The film or the like is cut from its center (central cut). Or, hold the width-direction end of the extracted package 50, and twist the held width-direction end upward with respect to the holding box 100 or twist the holding box 100 corresponding to the held width-direction end The width-direction end is twisted downward, whereby the cutting blade 200 can cut the packaging film or the like as the package 50 from the aforementioned width-direction end (end cutting). (Cutting blade)

FIG. 3 is a front view showing a schematic configuration of the cutting blade 200 of this embodiment. The cutting blade 200 is arranged with a plurality of teeth in the upper area of the cutting blade 200 in FIG. 3, and the lower area of the cutting blade 200 in FIG. 3 is then located in the mask 124 on the inner surface side of the front end 125, and The aforementioned multiple teeth are arranged in such a way that they slightly protrude from the front end 125.

The cutting blade 200 has a central area 210, a pair of side areas 220 arranged on the outer side of the central area 210, and a pair of end areas 230 arranged on the end of the cutting blade 200 on the outer side of the side area 220. The central area 210, the side area 220, and the end area 230 are all arranged with a plurality of teeth. In addition, in this embodiment, the central area 210 is the range of 5 to 20% of the entire length of the cutting blade 200 in the width direction, and the side area 220 is the entire length outside the central area 210 and the width of the cutting blade 200. The end region 230 is the outer side of the side region 220 and the range of 10 to 35% of the entire length of the cutting blade 200 in the width direction. In addition, in this specification, the side area 220 and the end area 230 are also collectively referred to as the "outer area".

In addition, in this embodiment, the configuration having the central area 210, the side area 220, and the end area 230 will be described, but the structure including the central area 210 and the side area 220 without the end area 230 may also be used. At this time, the central area 210 is the range of 20 to 30% of the entire length of the cutting blade 200 in the width direction, and the side area 220 is the outer side of the central area 210 and 70 to 80 of the entire length of the cutting blade 200 in the width direction. % Range.

The cutting blade 200 has a substantially V-shape as a whole. Thereby, the central area 210 is arranged protrudingly than the side areas 220, so that the teeth of the central area 210 can be easily pierced into the package 50 in the initial stage of the central cutting, and the central cutting can be performed more easily. (Central District)

4 is a partial enlarged view of the area X in FIG. 3 showing the teeth constituting the central area 210. The cutting blade 200 is formed symmetrically 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 with different tooth heights, and the plurality of central teeth are staggeredly arranged in such a way that the tooth tops of three consecutive central teeth are not on the same straight line. The central area 210 is the area where the tooth top reaches the package 50 first during the central cutting. At this time, since the tooth tops of the three consecutive central teeth are not located on the same straight line, but from the central tooth with higher tooth height to the package 50 in turn, the number of central teeth piercing the package 50 at the same time can be reduced. . As a result, the stress used to cut the package 50 is only distributed to a smaller number of central teeth than usual, so it is easier to pierce the tooth tip of each central tooth in the central area 210 into the package 50, which can be in the center In the early stage of cutting, the package 50 is cut with less stress. Therefore, the central area 210 can reduce the resistance to the user in the initial stage of central cutting.

Specifically, the central region 210 has a plurality of central large teeth 212 having the largest tooth height, a plurality of central middle teeth 214 having a smaller tooth height than the central large teeth 212, and a central small tooth 216 having a smaller tooth height than the central central tooth 214.

In this embodiment, as shown in FIG. 4, if any one of the central large teeth 212, the central middle teeth 214, and the central small teeth 216 constituting the central area 210 is extended, the hypotenuse inside the central tooth is extended The point where the line intersects the extension line of the hypotenuse outside the central tooth adjacent to the inner side of the central tooth is set as the intersection point CS, and the central large tooth 212, central middle tooth 214, and central small tooth 216 constituting the central area 210 have Regarding the shape where the intersection point CS of all central teeth is located on the same imaginary straight line (hereinafter also referred to as "tooth bottom line L1"). In this embodiment, regarding the central large tooth 212, the central middle tooth 214, and the central small tooth 216, the hypotenuse on the inner side of the central tooth and the oblique side on the outer side of the central tooth adjacent to the inner side of the central tooth are all arc-shaped . The outer hypotenuse and the inner hypotenuse are formed by arcs that form part of two circles that are different from each other. The extension lines of the aforementioned outer hypotenuse and inner hypotenuse respectively constitute the outer hypotenuse and the inner oblique The extension line of the arc of the edge. However, the hypotenuse on the inner side of the central tooth and the hypotenuse on the outer side of the central tooth adjacent to the inner side of the central tooth can also have one of the hypotenuses being arc-shaped and the other of the hypotenuse being straight, or both can be straight shape. When the hypotenuse is straight, the intersection of the extension lines of each straight line is set as the intersection point CS.

In addition, in the present embodiment, the central large teeth 212, central middle teeth 214, and central small teeth 216 constituting the central region 210 have the following shapes: for all central teeth, the top of the central tooth and the center of the central tooth are adjacent to each other. The tangent point between the edge of the tooth tip connection (hereinafter also referred to as "connecting edge") and the imaginary straight line parallel to the tooth bottom line L1 is on the same straight line (hereinafter also referred to as "valley line L2'"). However, the central large tooth 212, the central middle tooth 214, and the central small tooth 216 may not be located on the same valley line L2' with respect to all the central teeth, or multiple valley lines may be set in the central area 210.

In addition, in this embodiment, the tooth tops of all the central middle teeth 214 are located on the same imaginary straight line (hereinafter also referred to as "medium tooth line L3"), and the tooth tops of all central large teeth 212 are located on the same imaginary straight line (hereinafter also referred to as "Large tooth line L4"). The straight lines L1, L2', L3, and L4 are all parallel. If an imaginary straight line passing through the tooth tip of the central small tooth 216 and parallel to the straight lines L3 and L4 is set as the small tooth line L5, 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 are arranged in sequence.

The central large tooth 212 is arranged in the central area 210 at a position that is also the center of the V-shaped apex of the cutting blade 200 (the central large tooth 212a in FIG. 4), and there are a number of positions on both sides of the V-shaped apex. (The two large central teeth 212b and 212c in Figure 4). The central tooth 212 is the first to penetrate the central tooth of the package 50 in the initial stage of the central cutting. By successively piercing the package 50 from the central tooth 212a arranged at the apex of the V shape toward the two outer sides, the package 50 Cut off. Thereby, the initial cutting of central cutting can be started with less stress. In addition, the large central tooth 212 has higher mechanical strength due to the greater width of the tooth root. Therefore, by arranging a plurality of central large teeth 212 in the central area 210, the mechanical strength of the central area 210 can also be improved and the durability of the cutting blade 200 can be improved.

A plurality of central middle teeth 214 are arranged across the entire central region 210 (four on one side in FIG. 4). The central middle tooth 214 pierces the package 50 after the central large tooth 212, so that the cutting of the package 50 is further performed. At this time, by placing a number of teeth in the central central tooth 214 (the two central central teeth 214a and the central central tooth 214b in FIG. 4) at the position sandwiched between the two central large teeth 212, the root cause can be reduced. The resistance to cutting caused by the large valleys of the wide central tooth 212 hooking the package 50 during cutting makes the cutting of the package 50 easier. In addition, several other teeth in the central middle tooth 214 (the two central middle teeth 214c and the central middle tooth 214d in FIG. 4) are arranged in the area on the side of the central area 210 to the side area 220, so that the package 50 is cut off It moves smoothly from the central area 210 to the side area 220.

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

Regarding the central large teeth 212, central middle teeth 214, and central small teeth 216 constituting the central area 210, the oblique side outside the central tooth and the oblique side inside the central tooth adjacent to the outside of the central tooth pass through one or more The arcs are connected without bending points. In addition, the so-called connection without a bending point means that both the hypotenuse on the outer side of the tooth and the hypotenuse on the inner side of the adjacent tooth on the outer side of the tooth and the connection point of the aforementioned arc are intersection points with a curvature. No vertex-shaped bends with discontinuous changes in slope. According to the findings of the inventors, compared with when the hypotenuses of each central tooth are connected with each other or the hypotenuse and the valley have a certain angle (in a manner with a bending point), if the hypotenuse of each central tooth If the connection does not have a bending point (no bending point is generated between the tooth mountains), the travel direction of the gap generated at the rupture meeting point will be closer to the width direction of the package 50, so that the longitudinal cracking during recovery More difficult to produce.

In addition, in this embodiment, the radius of curvature (Rc) of the aforementioned arc connecting the oblique side outside a central tooth and the oblique side inside the central tooth adjacent to the outside side of the central tooth is 0.5 mm or more and 1.3 mm. the following. If the aforementioned radius of curvature (Rc) is 0.5 mm or more, it can make it difficult to produce a gap at the rupture junction, and the travel direction of the gap generated at the rupture junction can be closer to the width direction of the package 50, making it more difficult Longitudinal cracking during recovery occurs. If the radius of curvature (Rc) is 1.3 mm or less, it is difficult for the package 50 to catch on the arc during cutting, and the cutting can be more easily performed. From the foregoing 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 addition, in the present embodiment, the central area 210 does not have outward teeth, and all are upward teeth. In other words, the outward teeth are arranged only in the outer region (only in the side region 220 in this embodiment). The central area 210 without the aforementioned outward teeth can make it difficult to interrupt the cutting caused by the package 50 hooking on the outward teeth in the initial stage of the cutting of the central cutting. (Side area)

FIG. 5 is a partial enlarged view of the area Y in FIG. 3 showing the side teeth constituting the side area 220. The side area 220 includes a plurality of side teeth 222 with the same tooth height. In this embodiment, the plurality of side teeth 222 are all outward teeth with the tooth tips facing the outside. The side area 220 is the area where the cutting of the package 50 starting in the central area 210 proceeds toward the end of the package 50 during the central cutting, and is the area where the package 50 starts at the end area 230 during the end cutting. This cuts the area toward the center of the package 50. In the side area 220, the multiple side teeth 222 formed are all outward teeth. Therefore, it is easy to pierce the side teeth 222 into the package 50 when the end is cut, and it is difficult to cause the package 50 relative to the side teeth. Miter cut caused by lateral sliding.

In this specification, as shown in FIG. 5, one of the side teeth 222 (outward teeth) constituting the side region 220 is set to T1, and the adjacent teeth arranged adjacent to the outside of the side teeth T1 are set to T2, and the adjacent teeth The adjacent tooth arranged inside the side tooth T1 is designated as T3. Furthermore, as shown in Fig. 5, the point where the extension line of the oblique side on the outer side of the side tooth T1 intersects the extension line of the oblique side adjacent to the inner side of the tooth T2 is set as the intersection point S1, and the inner side of the side tooth T1 The point where the extension line of the oblique side intersects with the extension line of the oblique side adjacent to the outer side of the tooth T3 is defined as the intersection S2.

In addition, a perpendicular line falling from the tooth tip of the side tooth T1 with respect to the imaginary straight line connecting the intersection point S1 and the intersection point S2 (the same straight line as the tooth bottom line L1 in this embodiment) crosses the aforementioned imaginary straight line (tooth bottom line L1) The point of is set as the intersection point S3. In addition, let the distance between S1 and S3 be D1, and let the distance between S1 and S2 be D2.

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

If D1/D2 is 0.40 or less, the tooth tip of the side tooth T1 (outward tooth) is more toward the outside, so the side tooth T1 can be pierced into the package 50 with less stress during end cutting, so that The cutting of the package 50 is easily performed. Therefore, it is possible to suppress the occurrence of chamfering caused by the side teeth T1 not sufficiently piercing the package 50 when the end portion is cut, and the package 50 slides laterally with respect to the side teeth. If D1/D2 is 0.20 or more, the tooth tops of the side teeth T1 (outward teeth) will not be too outward. Therefore, when cutting in the center, the cutting of the package 50 starting in the central area 210 is difficult to be carried out by the side The teeth T1 obstruct, and the aforementioned cutting is easier to be performed in the end direction. Moreover, this can suppress the occurrence of chamfering during end cutting. A more preferable range for good cutting for either end cut or 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 addition, in this specification, regarding all the teeth of the central tooth, the side tooth and the end tooth, the so-called "outward tooth" refers to the tooth whose tooth is set to T1 and the D1/D2 calculated by the aforementioned method is less than 0.50, the so-called " "Upward tooth" refers to a tooth with D1/D2 of 0.50 or more (preferably 0.75 or less).

Regarding the plurality of side teeth 222 (outward teeth) constituting the side region 220, the hypotenuse outside the side teeth (external teeth) and the inner side of the side teeth (external teeth) adjacent to the outside of the side teeth The hypotenuses are all connected via one or more arcs without bending points. As a result, the cutting of the package 50 is generated along the oblique edge, and it is difficult to proceed in the direction of the wound body. As a result, the travel direction of the notch (split) is closer to the width direction of the package 50, and it is difficult to generate the wound body during restoration. The direction of longitudinal cracking makes it easier to recover when rewinding.

In this embodiment, regarding any side tooth, the radius of curvature (R1) of the aforementioned arc connecting the hypotenuse outside the side tooth T1 and the hypotenuse inside the adjacent tooth T2 is 0.3 mm or more and 1.3 mm or less . If the aforementioned radius of curvature (R1) is 0.3 mm or more, it is difficult to produce longitudinal cracks at the confluence point of the cracks, and it is easier to recover during rewinding. If the aforementioned radius of curvature (R1) is 1.3 mm or less, it is difficult for the package 50 to be hooked on the aforementioned arc, and it is easier to cut in either the center cut or the end cut. From the foregoing viewpoint, the preferred range of the radius of curvature R1 is 0.35 mm or more and 1.2 mm or less, and more preferably 0.35 mm or more and 1.0 mm or less.

In addition, the curvature radius R of the hypotenuse on the outer 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. In addition, the radius of curvature R of the oblique side adjacent to the inner side of the 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 aforementioned value, the resistance to cutting caused by the hooking of the package 50 near the bottom of the connecting edge during cutting can be reduced, making the cutting of the package 50 easier, and It is difficult to produce longitudinal cracks at the confluence of ruptures, and it is easier to recover when rewinding.

In addition, in this embodiment, an imaginary straight line tangent to the connecting edge connecting the tooth top of the side tooth T1 and the tooth top of the adjacent tooth T2 and parallel to the tooth bottom line L1 is parallel to the valley line L2' and to the tooth valley Lines L2' different straight lines (hereinafter also referred to as "valley line L2"). In this embodiment, the valley line L2 is located between the valley line L2' and the small tooth line L5 (refer FIG. 4). In addition, the imaginary straight line connecting the tooth tips of the side teeth 222 (outward teeth) is the same straight line as the middle tooth line L3. In addition, the position of the imaginary straight line connecting the tooth tips of the side teeth is not particularly limited, as long as it is 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. can. In addition, in Figure 5, the tooth tops of all the side teeth are located on the mid-tooth line L3, but the tooth tops of all the side teeth may not be located on the same imaginary straight line (the mid-tooth line L3 in Figure 5). In other words, the side region 220 may also have a plurality of side teeth with different distances from the tooth bottom line L1 to the tooth tops of the side teeth. (End zone)

6 is a partial enlarged view of the area Z in FIG. 3 showing the teeth constituting the end region 230. The end region 230 includes a plurality of end teeth with different tooth heights. In this embodiment, the plurality of end teeth are all upward teeth. In addition, the plurality of end tooth systems are alternately arranged such that the tooth tops of the three consecutive end teeth are not on the same straight line. The end area 230 is the area where the tooth top reaches the package 50 first when the end is cut. At this time, since the tooth tops of the three consecutive end teeth are not on the same straight line, but from the end teeth with higher tooth heights to the package 50 in order, the end teeth that pierce the package 50 at the same time can be reduced. The number of. As a result, the stress used to cut the package 50 is only distributed to a smaller number of end teeth than usual, so it is easier to pierce the tip of the end teeth in the end region 230 into the package 50. The cutting of the package 50 is started with less stress at the beginning of the end cutting. Therefore, the end region 230 can reduce the resistance to the user in the initial stage of end cutting.

On the other hand, the end area 230 is the area where the package 50 is cut last during the central cutting. At this time, when the packaging container 10 is rotated downward, the end area 230 can make each end tooth pierce the package 50 in turn, so that the package 50 is cut from the central area 210 to the side area 220 Go smoothly.

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

In this embodiment, a plurality of large end teeth 232 are arranged in the end region 230 (two large end teeth 232a and 232b in FIG. 6). The large end teeth 232 are the teeth that pierce the package 50 first in the initial stage of end cutting, and start by piercing sequentially from the large end teeth 232 arranged at the end of the cutting blade 200 toward the central side. Cut off the packaging 50. Thereby, the initial cutting of the end cutting can be started with less stress. In addition, the large end teeth 232 have higher mechanical strength due to the greater width of the tooth root. Therefore, by arranging a plurality of large end teeth 232 in the end region 230, the mechanical strength of the end region 230 can be improved and the durability of the cutting blade 200 can be improved.

The middle end teeth 234 pierce the package 50 after the large end teeth 232 to further cut the package 50. By placing a number of end middle teeth (end middle teeth 234a in FIG. 6) between the two end large teeth 232 in the end middle teeth 234, the gap between the end large teeth 232 due to the wide tooth root width can be reduced. The resistance to cutting caused by hooking the package 50 when the wide valley is cut makes the cutting of the package 50 easier. In addition, the other end middle teeth of the end middle teeth 234 (the end middle teeth 234b in FIG. 6) are arranged in the area on the side area 220 side in the end area 230, so that the package 50 is cut from the end area 230 moves smoothly to the side area 220.

Regarding the end large teeth 232 and the end middle teeth 234 constituting the end region 230, the hypotenuse on the outer side of the end tooth and the hypotenuse on the inner side of the end tooth adjacent to the outer side of the end tooth pass through one or more The arcs are connected without bending points. If the hypotenuses of each end tooth are connected via arcs as described above, it is difficult to produce longitudinal cracks at the junction of the cracks, and it is easier to recover during rewinding.

In this embodiment, the radius of curvature R of the hypotenuse on the outer side of the end tooth is preferably 1.0 mm or more and 10.0 mm or less, more preferably 1.5 mm or more and 8.0 mm or less. In addition, the radius of curvature R of the oblique side adjacent to the inner side of the tooth of 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 aforementioned value, the resistance to cutting caused by hooking the package 50 near the bottom of the connecting edge during cutting can be reduced, making the cutting of the package 50 easier, and The travel direction of the notch generated at the meeting point of the film rupture is closer to the width direction of the package 50, so that it is difficult to cause longitudinal cracks when the rewinded package is restored (at the time of restoration).

In addition, in this embodiment, the radius of curvature (R2) of the aforementioned arc connecting the hypotenuse outside of one end tooth and the hypotenuse inside the end tooth adjacent to the outside of the end tooth is 0.3 mm or more. Below 1.3 mm. If the aforementioned radius of curvature (R2) is 0.3 mm or more, it can make it difficult to produce a gap at the junction of the fracture. If the aforementioned radius of curvature (R2) is 1.3 mm or less, it is difficult for the package 50 to be hooked on the arc at the beginning of the end cutting and the final cutting of the center cutting, and the package 50 can be cut more easily Off. From the foregoing 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 addition, in this embodiment, as shown in FIG. 6, regarding any one of the end large teeth 232 and the end middle teeth 234 constituting the end region 230, if the extension line of the hypotenuse inside the end teeth is compared with The point where the extension line of the oblique side of the outer side of the end tooth adjacent to the inner side of the end tooth intersects is set as the intersection point PS, and the end large tooth 232 and the end middle tooth 234 constituting the end region 230 have all the ends The shape where the intersection point PS of the tooth is located on the bottom line L1 of the tooth. In addition, with regard to all the end teeth constituting the end large teeth 232 and the end middle teeth 234 of the end region 230, they have the following shape: the tooth tip of the end tooth and the end tooth adjacent to the outer side of the end tooth The connecting edge of the tooth top connection is tangent to a straight line parallel to and different from the valley line L2 (hereinafter also referred to as "valley line L2""). However, the large end teeth 232 and the middle end teeth 234 may not be located on the same valley line L2″ with respect to all the teeth, or multiple valley lines may be set in the end region 230. In this embodiment, the valley line L2" is located between the valley line L2 and the tooth bottom line L1 (refer to FIG. 6). In addition, the imaginary straight line connecting the tooth tips of the large end teeth 232 is the same straight line as the large tooth line L4, and the imaginary straight line connecting the tooth tips of the middle end teeth 234 and the middle tooth line L3 are the same straight line. In addition, the position of the imaginary straight line connecting the tooth tips of the large end teeth 232 is not particularly limited, as long as it is a straight line higher than the position of the middle tooth line L3. In addition, the position of the imaginary straight line connecting the tooth tip of the end middle tooth 234 is not particularly limited, as long as 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. OK. [Second Embodiment]

Fig. 7 is a front view showing a schematic configuration of a cutting blade 300 according to a second embodiment of the present invention. The cutting blade 300 is the same as the cutting blade 200 in the first embodiment, and has a central area 310, a pair of side areas 320 arranged on the outer side of the central area 310, and the cutting blade 300 arranged on the outer side of the side area 320 One of the ends of the pair of end regions 330. In the cutting blade 300 of this embodiment, only the shape of the teeth constituting the side region 320 and the end region 330 is different from the cutting blade 300 of the first embodiment. Therefore, the description of the common points with the cutting blade 300 in the first embodiment will be omitted below.

As described below, in this embodiment, the cutting blade 300 has a central area 310, a side area 320 (side connection area 320a and side main area 320b), and an end area 330 (end connection area 330a and end main area). Area 330b). The central area 310 is in the range of 5 to 20% of the entire length in the width direction of the cutting blade 300, and the side connection area 320a is outside the central area 310 and 10 to 20% of the entire length in the width direction of the cutting blade 300 Range, the side main area 320b is outside the side connection area 320a and the range of 35 to 50% of the entire length in the width direction of the cutting blade 200, and the end connection area 330a is outside the side main area 320b and the cutting blade The width direction of the cutting blade 300 is in the range of 5 to 10% of the entire length, and the end main area 330b is outside the end connecting area 330a and the range of 10 to 25% of the entire length in the width direction of the cutting blade 300.

In addition, in the present embodiment, the configuration having the central area 310, the side area 320, and the end area 330 will be described. However, the structure including the central area 310 and the side area 320 may not have the end area 330. At this time, the central area 310 is the range of 20 to 30% of the entire length of the cutting blade 300 in the width direction, and the side area 320 is the outer side of the central area 310 and 70 to 80 of the entire length of the cutting blade 300 in the width direction. % Range. (Central District)

The central area 310 has a plurality of central large teeth 312 with the largest tooth height, a plurality of central middle teeth 314 with a smaller tooth height than the central large teeth 312, and a central small tooth 316 with a smaller tooth height than the central central tooth 314. These central teeth are the same as those of the first embodiment, so detailed descriptions are omitted. (Side area)

As shown in FIG. 7, in this embodiment, the side area 320 has a side connection area 320a as a connection area with the central area 310, and a side main area 320b having a plurality of outward teeth.

FIG. 8 is a partial enlarged view of the area S in FIG. 7 showing teeth near the boundary between the central area 310 and the side area 320 (side connection area 320a). FIG. 9 is a partial enlarged view of the area T in FIG. 7 showing the teeth constituting the vicinity of the boundary between the side connecting area 320a and the side main area 320b.

The side connecting area 320a includes a plurality of side teeth 322a with the same tooth height, and the plurality of side teeth 322a are all upward teeth. The side connecting area 320a including a plurality of upward teeth makes the cutting of the package 50 easy to be performed between the central region 310 which also includes the upward teeth, and makes it easy to cut the package 50 at the same height as the teeth. Between the main side areas 320b. Therefore, the side connection area 320a facilitates the cutting of the package 50 using the center cut from the central area 310 to the side main area 320b, and makes the cutting of the package 50 using the end cut easy to cut from the side main area 320b proceed to the central area 310.

Regarding the plurality of side teeth 322a constituting the side connecting region 320a, the oblique side outside the side tooth and the oblique side inside the side tooth adjacent to the outside side of the side tooth pass through one or more arcs It is connected without bending points. Thereby, it is difficult for the cutting blade to hook the packaging 50 during the cutting of the packaging 50, and it is difficult to produce longitudinal cracks, so that the restoration during rewinding becomes easier.

In addition, in this embodiment, regarding either side tooth (both the outward tooth and the upward tooth), the hypotenuse on the outer side of the side tooth 322a and the inner side of the side tooth adjacent to the outer side of the side tooth The radius of curvature (R1') of the aforementioned arcs connected by the hypotenuse is 0.3 mm to 1.3 mm. If the aforementioned radius of curvature (R1') is 0.3 mm or more, it is difficult to produce longitudinal cracks at the confluence point of the cracks, and it is easier to recover during rewinding. If the aforementioned radius of curvature (R1') is 1.3 mm or less, it is difficult for the package 50 to be caught in the aforementioned arc, and it is easier to cut in either the center cut or the end cut. From the foregoing viewpoints, the preferred range of the radius of curvature R1' is 0.35 mm or more and 1.2 mm or less, and more preferably, the range is 0.35 mm or more and 1.0 mm or less.

The main side area 320b includes a plurality of side teeth 322b with the same tooth height, and the plurality of side teeth are all outward teeth. The side main area 320b with a plurality of outward teeth is the same as the side area 220 in the first embodiment, especially when the end is cut, it is easy to pierce the side teeth into the package 50, and it is difficult to cause the package 50 to face each other. Miter cut caused by lateral sliding of the side teeth.

In addition, the side teeth (side connecting teeth 322c) of the side teeth 322b arranged closest to the side connecting region 320a among the plurality of side teeth 322b in the side main region 320b have a smaller tooth width than that of the side connecting region 320a. The side teeth 322a and the side main area 320b have the tooth widths of other side teeth 322b. This kind of side connecting teeth 322c mainly has the function of cutting off the transition between the side connecting area 320a including the upward teeth and the main side area 320b including the outward teeth, and can suppress the lateral sliding of the package in this area .

In this embodiment, also as shown in FIG. 9, one of the side teeth (the side teeth 322b or the side connecting teeth 322c as the outward teeth) arranged in the side main area 320b is set to T1, and is arranged adjacent to The adjacent tooth on the outer side of the side tooth T1 is referred to as T2, and the adjacent tooth arranged adjacent to the inside of the side tooth T1 is referred to as T3. Moreover, as shown in Fig. 9, the point where the extension line of the oblique side on the outer side of the side tooth T1 intersects with the extension line of the oblique side adjacent to the inner side of the tooth T2 is set as the intersection S1, and the inner side of the side tooth T1 The point where the extension line of the oblique side intersects with the extension line of the oblique side adjacent to the outer side of the tooth T3 is defined as the intersection S2.

In addition, in this embodiment, the vertical line that hangs from the tooth tip of the side tooth T1 with respect to the imaginary straight line connecting the intersection S1 and the intersection S2 (also the same straight line as the bottom line L1 in this embodiment) and the aforementioned imaginary straight line The intersection point (tooth bottom line L1) is set to intersection point S3. In addition, let the distance between S1 and S3 be D1, and let the distance between S1 and S2 be D2. At this time, in the side region 320, the ratio of D1 to D2 satisfies the following formula 1. D1/D2 = 0.20 or more and 0.40 or less... (Equation 1)

If D1/D2 is 0.40 or less, the tooth tip of the side tooth T1 (outward tooth) is more toward the outside, so the side tooth T1 can be pierced into the package 50 with less stress during end cutting, so that The cutting of the package 50 is easily performed. Therefore, it is possible to suppress the occurrence of chamfering caused by the side teeth T1 not sufficiently piercing the package 50 when the end portion is cut, and the package 50 slides laterally with respect to the side teeth. If D1/D2 is 0.20 or more, the tooth tops of the side teeth T1 (outward teeth) will not be too outward. Therefore, when cutting in the center, the cutting of the package 50 starting in the central area 210 is difficult to be carried out by the side The teeth T1 obstruct, and the aforementioned cutting is easier to be performed in the end direction. Moreover, this can suppress the occurrence of chamfering during end cutting. A more preferable range for good cutting for either end cut or 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 this embodiment, the side teeth (external teeth) constituting the side main area 320b are also related to the hypotenuse outside the side teeth (external teeth) and the side teeth adjacent to the outside of the side teeth The hypotenuses on the inner side of the (outward tooth) are all connected via one or more arcs without bending points. Thereby, it is difficult for the cutting blade to hook the packaging 50 during the cutting of the packaging 50, and it is difficult to produce longitudinal cracks, so that the restoration during rewinding becomes easier.

In addition, in this embodiment, regarding either side tooth, the radius of curvature (R1) of the arc connecting the hypotenuse outside of the side tooth T1 and the hypotenuse inside the adjacent tooth T2 is 0.3 mm or more. Below 1.3 mm. If the aforementioned radius of curvature (R1) is 0.3 mm or more, it is difficult to produce longitudinal cracks at the confluence point of the cracks, and it is easier to recover during rewinding. If the aforementioned radius of curvature (R1) is 1.3 mm or less, it is difficult for the package 50 to be hooked on the aforementioned arc, and it is easier to cut in either the center cut or the end cut. From the foregoing viewpoint, the preferred range of the radius of curvature R1 is 0.35 mm or more and 1.2 mm or less, and more preferably 0.35 mm or more and 1.0 mm or less.

In addition, in this embodiment, the radius of curvature R of the hypotenuse on the outer side of the side tooth T1 is also 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. In addition, the radius of curvature R of the oblique side adjacent to the inner side of the 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 aforementioned value, the resistance to cutting caused by the hooking of the package 50 near the bottom of the connecting edge during cutting can be reduced, making the cutting of the package 50 easier, and It is difficult to produce longitudinal cracks at the confluence of ruptures, and it is easier to recover when rewinding.

In addition, in this embodiment, an imaginary straight line tangent to the connecting edge connecting the tooth top of the side tooth T1 and the tooth top of the adjacent tooth T2 and parallel to the bottom line L1 is parallel to the valley line L2' and to the valley line L2'different straight lines (tooth valley line L2a and tooth valley line L2b). In this embodiment, the valley line L2a and the valley line L2b are also located between the valley line L2' and the small tooth line L5. In addition, the valley line L2a when the plurality of side teeth constituting the side connecting region 320a is the side tooth T1 and the adjacent tooth T2, and the plurality of side teeth constituting the side main region 320b is the side The tooth T1 and the tooth valley line L2b when the tooth T2 is adjacent to each other are parallel and different straight lines. In this embodiment, the valley line L2b is located between the valley line L2a and the valley line L2'. On the other hand, regarding the plurality of side teeth 322a constituting the side connection region 320a, the extension line of the oblique side inside the side tooth 322a and the oblique side outside the side tooth adjacent to the inside of the side tooth 322a The intersection point where the extension lines of the sides intersect is on a straight line parallel to the tooth bottom line L1 and different from the tooth bottom line L1 (tooth bottom line L1'). In this embodiment, the tooth bottom line L1' is located between the valley line L2' and the valley line L2. In addition, the imaginary straight line connecting the tooth tips of the side teeth 322a, the side teeth 322b, and the side connecting teeth 322c is the same straight line as the middle tooth line L3. In addition, the position of the imaginary straight line connecting the tooth tips of these side teeth is not particularly limited, as long as it is the same straight line as the small tooth line L5, or a position higher than the small tooth line L5 and lower than the large tooth line L4 Just be straight. In addition, in Figures 8 and 9, the tooth tops of all the side teeth are located on the mid-tooth line L3, but the tooth tops of all the side teeth may not be located on the same imaginary straight line (the mid-tooth line L3 in Figures 8 and 9) on. In other words, the side region 320 may also have a plurality of side teeth with different distances from the tooth bottom line L1 to the tooth tops of the side teeth. (End zone)

As shown in FIG. 7, in this embodiment, the end area 330 has an end connection area 330a as a connection area with the side area 320 (side main area 320b), and an end main area having a plurality of outward teeth 330b.

Fig. 10 is a partial enlarged view of the area U in Fig. 7 showing the teeth constituting the end connecting area 330a and the end main area 330b.

The end connection area 330a includes a plurality of end teeth with different tooth heights, and the foregoing end teeth are all outward teeth. In addition, the aforementioned plurality of end tooth systems are arranged in such a way that the tooth tops of three consecutive end teeth are not located on the same straight line. Specifically, the end connecting area 330a has a plurality of connecting middle teeth 336 having the same tooth height as the side teeth 322b of the side main area, and the tooth heights between the connecting middle teeth 336 and the end main area 330b have A plurality of large connecting teeth 338 between the large end teeth 332. Furthermore, the connecting middle teeth 336 and the connecting large teeth 338 are alternately arranged. In addition, the imaginary straight line connecting the tooth tips of the middle tooth 336 is the same straight line as the middle tooth line L3, and the imaginary straight line L6 connecting the tooth tips of the large tooth 338 is higher than the middle tooth line L3 and lower than the large tooth line L4. The position of the straight line.

The end connecting area 330a has a plurality of end teeth with different tooth heights, so that the package 50 is cut from the side main area 320b with lower tooth height to the end main area 330b with higher tooth height ( Or it moves smoothly from the end main area 330b to the side main area 320b).

The end main area 330b includes a plurality of large end teeth 332 and a plurality of middle end teeth 334 similarly to the first embodiment. However, in this embodiment, both the large end teeth 332 and the middle end teeth 334 are outwardly directed teeth. Such an end region 330 is easy to pierce the end teeth when the end is cut, and it is difficult to generate a chamfer caused by the lateral sliding of the package 50 relative to the end teeth.

In addition, as shown in FIG. 10, the end tooth (the end middle tooth 334 in FIG. 10) that is an outward tooth in the end main area 330b is set to T4, and the end tooth is arranged adjacent to the outer side of the end tooth T4. The adjacent tooth is set to T5 (the large end tooth 332b in FIG. 10), and the adjacent tooth arranged adjacent to the inner side of the end tooth T4 is set to T6 (the large end tooth 332a in FIG. 10). In addition, as shown in Fig. 10, the point where the extension line of the oblique side on the outer side of the end tooth T4 intersects the extension line of the oblique side adjacent to the inner side of the tooth T5 is set as the intersection S4, and the inner side of the end tooth T4 The point where the extension line of the oblique side intersects the extension line of the oblique side on the outer side of the adjacent tooth T6 is referred to as intersection S5.

At this time, the vertical line that hangs from the tooth tip of the end tooth T4 with respect to the imaginary straight line connecting the intersection S4 and the intersection S5 (the same straight line as the tooth bottom line L1 in this embodiment) and the aforementioned imaginary straight line (tooth bottom line L1) The crossing point is referred to as crossing point S6. In addition, the distance between S4 and S6 is D3, and the distance between S4 and S5 is D4. At this time, the ratio of D3 to D4 satisfies Equation 2 below. D3/D4=0.35 or more and less than 0.50...(Equation 2)

If D3/D4 is less than 0.50, the tooth tops of the outward teeth in the end area 330 face outwards, so when the end is cut, the end teeth can be pierced into the package 50 with less stress, which can make the package The cut of 50 is easy. Therefore, it is possible to suppress the occurrence of chamfering caused by the lateral sliding of the package 50 relative to the end teeth due to insufficient penetration of the package 50 by the end teeth. If D3/D4 is 0.35 or more, the tooth tops of the outward teeth in the end zone 330 will not be too outward. Therefore, when cutting in the center, the cutting of the package 50 starting in the central zone 310 is difficult to be cut by the end zone The outward teeth of 330 hinder the cutting, so that the aforementioned cutting can proceed to the end of the package 50 more smoothly. A more preferable range for good cutting for either end cut or 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. In addition, the value of D3/D4 with respect to the outward teeth of the end main area 330b is preferably greater than the value of D1/D2 with respect to the outward teeth of the side main area 320b.

In this way, by making the D3/D4 of the outward teeth in the main end area 330b larger than the D1/D2 of the outward teeth in the side main area 320b, it is easier to pierce the end teeth into the package 50 during end cutting. , So as to more effectively suppress the occurrence of chamfering during end cutting.

In addition, in this embodiment, the imaginary straight line tangent to the connecting edge connecting the end tooth T4 and the adjacent tooth T5 and parallel to the tooth bottom line L1 is also the same straight line as the valley line L2".

In addition, the connecting middle tooth 336 or the connecting large tooth 338 in the end connecting area 330a is set as the end tooth T4, and D3/D4 when the same is specified is also preferably greater than the end of the end main area 330b. The tooth 332 or the end middle tooth 334 is set as the end tooth T4, and D3/D4 is the same range as specified. However, at this time, by D3/D4 of the connecting middle teeth 336a and the connecting large teeth 338a arranged on the side main area 320b side in the end connecting area 330a, the end connecting area 330a is arranged at the end main The D3/D4 of the connecting middle tooth 336b and the connecting large tooth 338b on the side of the area 330b is larger (closer to the D3/D4 of the outward tooth in the main area 330b at the end), which can cut the package 50 from the side The main area 320b smoothly moves to the end area 330 (or from the end area 330 to the side main area 320b).

In addition, at this time, D1/D2 of the outer teeth in the side main area 320b, D3/D4 of the outer teeth in the end connection area 330a, and D3/D4 of the outer teeth in the end main area 330b are preferably in order Get bigger.

Regarding the end teeth constituting the end area 330 (the end connection area 330a and the end main area 330b), the oblique side of the outer side of the end tooth and the inner side of the end tooth adjacent to the outer side of the end tooth The edges are all connected via one or more arcs without bending points. If the hypotenuses of each end tooth are connected via arcs as described above, it is difficult to produce longitudinal cracks at the junction of the cracks, and it is easier to recover during rewinding.

In this embodiment, the radius of curvature (R2) of the aforementioned arc connecting the hypotenuse on the outer side of one end tooth and the hypotenuse on the inner side of the end tooth adjacent to the outer side of the end tooth is also 0.3 mm or more and 1.3 mm below. If the aforementioned radius of curvature (R2) is 0.3 mm or more, it can make it difficult to produce a gap at the junction of the fracture. If the aforementioned radius of curvature (R2) is 1.3 mm or less, it is difficult for the package 50 to catch on the aforementioned arc during the initial cutting of the end cutting and the final cutting of the central cutting, and the cutting can be more easily performed. From the foregoing 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 addition, when either end tooth is the end tooth T4, the curvature radius R of the hypotenuse outside the end tooth T4 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 oblique side adjacent to the inner side of the 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 hypotenuse on the outer side of the end tooth T4 is connected by a circular arc, the radius of curvature R of the arc of the aforementioned connection is greater than the curvature radius R of the hypotenuse on the outer side of the end tooth T4 and the hypotenuse on the inner side of the adjacent tooth T5 Any one of the radius of curvature R is a small value, 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 aforementioned value, the resistance to cutting caused by hooking the package 50 near the bottom of the connecting edge during cutting can be reduced, making the cutting of the package 50 easier, and The travel direction of the notch generated at the meeting point of the film rupture is closer to the width direction of the package 50, so that it is difficult to cause longitudinal cracks when the rewinded package is restored (at the time of 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 portion is closed.

The packaging container of this embodiment is different from the packaging container of the first embodiment or the second embodiment in that the central area 410, the side area 420, and the end area 430 have a straight cutting blade 400. In addition, the shape of the teeth each of the central area 410, the side area 420, and the end area 430 can be the same as that of the first embodiment or the second embodiment.

In this embodiment, the front end 125 of the cover sheet 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 end sides. Furthermore, the aforementioned plurality of tooth systems are arranged such that the tooth bottom line L1, the 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 straight.

According to the packaging container 20 of this embodiment, when the end is cut, the outward teeth arranged in the side area on the opposite side to the end on the side where the cut is started are hard to hinder the cutting, so the end can be cut 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 portion is closed.

The packaging container of this embodiment is different from the packaging container of the first embodiment or the second embodiment in that it has a cutting blade 500 in which the central area 510, the side area 520, and the end area 530 are curved. In addition, the shape of the teeth each of the central area 510, the side area 520, and the end area 530 can be set to be the same as that of the first embodiment or the second embodiment.

In this embodiment, the front end 125 of the cover sheet 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 a substantially M-shaped apex, toward both end sides. Furthermore, the plurality of tooth systems are arranged in such a manner that the tooth bottom line L1, the valley line L2, the small tooth line L5, the middle tooth line L3, the large tooth line L4, etc. are arranged in the same way as the cutting blade 500 is set in the packaging container At 30 o'clock, the direction from the bottom plate 118 of the packaging container to the lid 120 is a convex curve.

According to the packaging container 30 of the present embodiment, the teeth of the end region 530 can be made to protrude further downwards, so the teeth of the end region 530 can easily penetrate the packaging 50 at the initial stage of end cutting, and the end cutting can be more easily performed . On the other hand, according to the packaging container 30 of this embodiment, similar to the first and second embodiments, the central area 510 is arranged protruding from the side areas 520. Therefore, it is easy to remove the central area 510 at the initial stage of central cutting. The teeth pierce the packaging 50, making it easier to perform central cutting.

In addition, the shape of the cutting blade 500 is not limited to the aforementioned substantially M-shape, and for example, it may be arranged only in the side area 520 such that the aforementioned lines become curved. [Effect confirmation test]

Prepare five resin cutting blades with central area and outer area (side area and end area). Regarding each cutting blade, the presence or absence of outward teeth, the D1/D2 or D3/D4 of the outward teeth, the shape of the tooth valley (connected by an arc with or without a bending point), and the arc of the tooth valley The radius of curvature of the arc when connecting is different.

Regarding 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. In addition, with regard to D1/D2, D3/D4, radius of curvature Rc, radius of curvature R1, and radius of curvature R2, when each zone contains teeth of different shapes, each zone is shown for D1/D2 and D3/D4 For all values in the radius of curvature Rc, radius of curvature R1, and radius of curvature R2, the lower limit and upper limit are shown, respectively.

Table 1 Central District Cutting blade No. Extrovert teeth Upward tooth D1/D2 of outward teeth The shape of the valley Radius of curvature Rc (mm) Cutting blade-1 no Have - Arc 0.6 to 0.98 Cutting blade-2 no Have - Arc 0.6 to 1.15 Cutting blade-3 no Have - There are bending points - Cutting blade-4 no Have - Arc 0.75 to 1.3 Cutting blade-5 no Have - Arc 0.75 to 1.3

Table 2 Lateral area Cutting blade No. Extrovert teeth Upward tooth D1/D2 of outward teeth The shape of the valley Radius of curvature R1 (mm) Cutting blade-1 Have Have 0.26, 0.37 Arc 0.37 to 0.86 Cutting blade-2 Have no 0.26 Arc 0.6 Cutting blade-3 no Have - There are bending points - Cutting blade-4 no Have - Arc 0.9 to 1.0 Cutting blade-5 Have no 0.29 Arc 0.77

table 3 End zone Cutting blade No. Extrovert teeth Upward tooth D3/D4 of outward teeth The shape of the valley Radius of curvature R2 (mm) Cutting blade-1 Have no 0.40, 0.48, 0.49 Arc 0.54 to 1.2 Cutting blade-2 no Have - Arc 0.6 to 1.1 Cutting blade-3 no Have - There are bending points - Cutting blade-4 Have no 0.48 Arc 0.9 to 1.3 Cutting blade-5 no Have - Arc 0.68 to 1.3

Using the cutting blade-1 to the cutting blade-5 respectively joined to the packaging container of the shape shown in Fig. 1 and Fig. 2, the following test-1 to test-3 were performed. (Test-1: Ease of end cutting)

25 testers including randomly selected men and women cut the polyvinylidene chloride film wound and contained in the packaging container by cutting the ends. The number of oblique cuts in 40 cuts performed by each tester was measured, and the ease of end cutting was evaluated based on the following criteria.

◊Over 70% of the testers who did not produce a single oblique cut

○For those who did not produce one time of chamfering, 50% or more and 69% or less of the total testers

ΔFor those who did not produce a chamfer, it was 30% or more and 49% or less of the total testers

×The number of testers whose oblique cut did not occur once is 29% or less of the total testers (Test-2: Recovery rate)

The polyvinylidene chloride film wound and contained in the packaging container is drawn out of the container by 30 cm, and the packaging film is cut with a blade in the packaging film while the lid is securely closed. Afterwards, the remaining packaging film is rolled back into the container in a manner that does not produce wrinkles as much as possible, and the end of the packaging film is closely attached to the wound packaging film.

From this state, let the 50 randomly selected testers draw out the entire width of the packaging film to the outside of the containment box without using tapes and other tools to prevent longitudinal cracks. The number of people who pulled out the entire width to the outside of the containment box within 2 minutes during the recovery performed by 50 testers was counted, and the probability was set as the recovery rate. (Test-3: Cutting force required for central cutting)

The packaging container containing the wound polyvinylidene chloride film is set in a measuring device equipped with a force gauge, the film is drawn out by 30 cm and fixed to the fixing jig of the measuring device. In this state, the packaging container is fixed so that the lid (covering sheet) of the packaging container does not leave the film, and the packaging container is rotated at a rotation speed of 90° per second by pressing the entire cutting blade against the film evenly. Rotate around the winding axis of the film being wound. At this time, the maximum value of the rotational force required for cutting the film is measured 5 to 10 times, and the average of these values is used as the cutting force required for central cutting.

Table 4 shows the results of Test-1 to Test-3 for each cutting blade.

Table 4 Evaluation Remarks Cutting blade No. Test-1 Ease of end cutting Test-2 Recovery rate Test-3 Cutting force required for central cutting Cutting blade-1 ◊ 84% 4.3N Example Cutting blade-2 ◊ 78% 4.8N Example Cutting blade-3 ○ 39% 4.2N Comparative example Cutting blade-4 Δ 92% 4.6N Example Cutting blade-5 Δ 85% 4.7N Example

According to the results in Table 4, it can be seen that if there are outward teeth only in the outer region (side region or end region), and the outward teeth are connected with the adjacent teeth adjacent to the outward teeth by a circular arc, then it will be rolled back The recovery rate of time is higher.

In addition, if D1/D2 is 0.20 or more and 0.40 or less, both end cutting and center cutting are easy to cut. When D3/D4 is 0.35 or more and less than 0.50, both end cutting and center cutting It is also easy to cut when cutting. [Other embodiments]

In addition, the foregoing embodiment only shows an example of the implementation of the present invention, and the technical scope of the present invention is not interpreted in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or main characteristics thereof.

For example, the central area, the side area (side connection area and side main area), and end area (end connection area and end main area) may respectively have the aforementioned radius of curvature, D1/D2 or D3/D4 Different teeth.

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

In addition, in each of the aforementioned embodiments, the radius of curvature R1 of all the outward teeth arranged in the side region is included in the aforementioned range. However, the radius of curvature R1 of any one of the outward teeth may be included in the aforementioned range. However, it is preferable that the radius of curvature R1 be included in the aforementioned range for at least half of the outward teeth, and it is more preferable that the radius of curvature R1 be included in the aforementioned range for all the outward teeth.

In addition, in each of the foregoing embodiments, the radius of curvature R2 of all the end teeth arranged in the end region is included in the aforementioned range, but any one of the end teeth may include the radius of curvature R2 in the aforementioned range. However, it is preferable to include the radius of curvature R2 in the aforementioned range for at least half of the end teeth, and it is more preferable to include the radius of curvature R2 in the aforementioned range for all the end teeth.

In addition, in each of the foregoing embodiments, the curvature radius R of the hypotenuse for all of the central teeth, the side teeth, and the end teeth is included in the foregoing range. However, as long as any one of the central teeth, side teeth, or end teeth is The radius of curvature R may be included in the aforementioned range. However, it is preferable that the curvature radius R of at least half of the teeth is included in the aforementioned range for each of the central tooth, the side teeth, and the end teeth, and it is more preferable that the curvature radius R of all the teeth is included in the aforementioned range.

In addition, in each of the aforementioned embodiments, it is assumed that D1/D2 is included in the aforementioned range with respect to all the outward teeth arranged in the side region, but it is only necessary that D1/D2 is included in the aforementioned range with respect to any one of the outward teeth. However, it is preferable that D1/D2 be contained in the aforementioned range for at least half of the outward teeth, and it is more preferable that D1/D2 be contained in the aforementioned range for all the outward teeth.

In addition, in the aforementioned second embodiment, it is assumed that D3/D4 is included in the aforementioned range with respect to all the outward teeth arranged in the end region, but D3/D4 should be included in the aforementioned range with respect to any one of the outward teeth. However, it is preferable that D3/D4 is contained in the aforementioned range for at least half of the outward teeth, and it is more preferable that D3/D4 is contained in the aforementioned range for all the outward teeth.

In addition, in each of the above-mentioned embodiments, the central small teeth are arranged in the central area, but it may be a configuration in which the central small teeth are not arranged.

In addition, in any of the foregoing embodiments, the cutting blade can be polyester, polyethylene, polypropylene, polystyrene, polyacetal, polyphenylene sulfide, polyether ether ketone (PEEK), or polyether sulfide (PES). , And polylactic acid (PLA) and other resins, can also be metal. However, as shown in the effect confirmation test-2, when the cutting blade is made of resin, longitudinal cracks in the package are more likely to occur. Therefore, the effect of suppressing the longitudinal cracking of the package is significant when the cutting blade is made of resin.

In addition, in the front panel, the area facing the cover sheet when the lid portion closes the opening portion has a stopper portion for attaching the package to the vicinity of the cut portion and suppressing rewinding. For example, the stopper may be formed with a fin formed on the front panel by prying up a part of the front panel and formed on the surface of the fin.

In addition, the surface of the main body, the cover, and the pressure plate can also be coated with UV-curable varnish and hardened for surface treatment to improve water resistance and light resistance.

In addition, as long as the packaging is rolled into a long sheet or film, the material can be resin (single layer including polyvinylidene chloride, vinyl chloride, polyethylene, polymethylpentene, etc.) Or multilayer films or sheets, etc.), paper (roll paper, kitchen paper, heating sheet for cooking and cooking sheet, etc.) and metal foil (aluminum foil, etc.).

This application is an application claiming priority based on the Japanese application number 2019-051447 filed on March 19, 2019, and the content described in the patent scope, specification, and drawings of the application is cited in this application. Industrial availability

The cutting blade of the present invention rewinds the package cut by the reverse rotation of the wrapped package to the inside of the main body, causing the end of the package to stick to the surface of the wrapped package, and When the above-mentioned attached end is restored between the main body and the lid, longitudinal cracks in the package can be suppressed. Therefore, the present invention can use packaging containers more comfortably, and promote the use of packaging films and the like in homes and businesses, and is expected to contribute to the development of this field.

10. 20, 30 Packaging container 50 Packaging materials 100 Shelter Boxes 110 Principal department 112a, 112b End plate 114 Front board 116 Backplanes 118 Backplane 119 Open face 120 Covering department of the cover 122 Covering plate 124 Covering film 125, 125a, 125b Front end of the cover sheet 126a, 126b Side cover sheet 128 Connecting part 200, 300, 400, 500 Cutting blades 210, 310, 410, 510 Central District 212, 212a, 212b, 212c, 312 Central Big Gear 214, 214a, 214b, 214c, 214d, 314 Central middle gear 216, 316 Central Xiaofang 220, 320, 420, 520 Side area 222, 322, 322a, 322b Side teeth 230, 330, 430, 530 End area 232, 232a, 232b, 332, 332a, 332b End big gear 234, 234a, 234b, 334 End center gear 320a Side connection area 320b Main area of the side department 330a End-to-end connection area 330b End main area 322c Side connection teeth 336, 336a, 336b Connected to the gear 338, 338a, 338b Connect the big gear

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

220...side area 222...side teeth D1, D2…distance L1...tooth bottom line L2...tooth line L3...Middle tooth line R1... radius of curvature S1, S2, S3...cross point T1, T2, T3...tooth

Claims (10)

A cutting blade is arranged along the length direction of a packaging container containing roll-shaped packaging. The cutting blade for cutting the aforementioned packaging has a central area arranged with a plurality of teeth and arranged outside the central area One pair of the outer region of the plurality of teeth, only the outer region has the tooth tip facing outward outward teeth, the oblique side of the outer side of the outer tooth and the inner side of the adjacent tooth arranged adjacent to the outer side of the outward tooth are used The arcs are connected, and the radius of curvature of the aforementioned arcs is 0.3mm or more and 1.3mm or less. The cutting blade described in claim 1, wherein the outer region has a side region arranged adjacent to the central region, and a pair of end regions arranged on the outer side of the side region, and the outward teeth Configured in the aforementioned side area. The cutting blade described in the second item of the scope of patent application, wherein when the outward tooth is set to T1, the adjacent tooth arranged adjacent to the outer side of the outward tooth T1 is set to T2, and it is adjacent to the inner side of the outward tooth T1 The adjacent tooth is configured as T3, and the point where the extension line of the oblique side on the outer side of the outer tooth T1 intersects the extension line of the oblique side of the inner side of the adjacent tooth T2 is set as the intersection point S1. The point where the extension line of the hypotenuse on the inner side intersects the extension line of the hypotenuse on the outer side of the adjacent tooth T3 is set as the intersection point S2, When the point at which the tooth bottom line, which is an imaginary straight line connecting the intersection point S1 and the intersection point S2, hangs down from the tooth tip of the aforementioned outward tooth intersects the aforementioned tooth bottom line is set as the intersection point S3, the intersection point S1 and the intersection point S3 The ratio of the distance between D1 and the distance D2 between the intersection point S1 and the intersection point S2 satisfies the following formula 1: D1/D2=0.20 or more and 0.40 or less... (Equation 1). The cutting blade described in claim 1, wherein the outer region has a side region arranged adjacent to the central region, and a pair of end regions arranged on the outer side of the side region, and the outward teeth Configured in the aforementioned end area. The cutting blade described in claim 4, wherein when the outward tooth is set to T4, the adjacent tooth arranged adjacent to the outer side of the outward tooth T4 is set to T5, and it is adjacent to the inner side of the outward tooth T4 The adjacent tooth is configured as T6, and the point where the extension line of the oblique side outside the outer tooth T4 intersects the extension line of the oblique side inside the adjacent tooth T5 is set as the intersection point S4, and the outer tooth T4 The point where the extension line of the inner hypotenuse crosses the extension line of the hypotenuse on the outer side of the adjacent tooth T6 is referred to as intersection S5, and the bottom line of the tooth relative to the imaginary straight line connecting the intersection S4 and the intersection S5 is from the aforementioned outward When the point where the vertical line of the tooth tip of the tooth intersects with the aforementioned tooth bottom line is set as the intersection point S6 The ratio of the distance D3 between the crossing point S4 and the crossing point S6 to the distance D4 between the crossing point S4 and the crossing point S5 satisfies the following formula 2: D3/D4=0.35 or more and less than 0.50... (Equation 2). The cutting blade according to any one of items 1 to 5 in the scope of the patent application, wherein regarding a tooth arranged in the central area, the hypotenuse on the outer side of the one tooth and the hypotenuse of the tooth adjacent to the one tooth are used Circular arc connection. The cutting blade described in item 6 of the scope of patent application, wherein the radius of curvature (Rc) of the arc connecting the hypotenuse on the outer side of the one tooth and the hypotenuse adjacent to the tooth is 0.5mm or more and 1.3mm the following. The cutting blade according to any one of items 1 to 5 in the scope of the patent application, wherein the outer region has an upper tooth with the tooth tip not facing the outer side, and regarding the upper tooth, a hypotenuse on the outer side of the upper tooth The hypotenuse of the tooth adjacent to the aforementioned upward tooth is connected by a circular arc. The cutting blade described in item 8 of the scope of patent application, wherein the outer region has a side region arranged adjacent to the central region, and a pair of end regions arranged on the outer side of the side region, and the upward tooth The radius of curvature (R1') of the arc connecting the oblique side of the outer side of the upward tooth and the oblique side of the tooth adjacent to the upward tooth is 0.3mm or more and 1.3mm or less. A packaging container, which has: a storage box that contains roll-shaped packaging; and the cutting blade according to any one of items 1 to 9 in the scope of patent application, which cuts the aforementioned packaging extracted from the aforementioned storage box .

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