TWI386351B - Packaging containers for packaging containers, packaging containers and packaging materials supply device - Google Patents

Abstract

A cutting blade (20) is used by being attached to a packaging container that contains a wrap film which is wound into a roll to cut the wrap film. The cutting blade (20) is equipped with a central part (21) that has multiple tooth tips lined up in a V-shape, with the center of the cutting blade (20) as the apex, in a direction parallel to the central axis of the roll-shaped wrap film, and a terminal part (22) provided on either side of the central part (21). Each terminal part (22) has a line of multiple tooth tips. The line of tooth tips of each terminal part (22) extends at an angle from one corresponding end of the both ends of the line of tooth tips of the central part (21). Each tooth tip of the terminal parts (22) is included in one corresponding tooth of multiple teeth provided on the terminal parts (22). Each tooth tip of the terminal parts (22) fits with respect to the direction parallel to the aforementioned central axis and an intermediate position between the corresponding pair of adjacent tooth bases of the multiple tooth bases, or is biased outward from the intermediate position with respect to the direction parallel to the aforementioned central axis.

Description

Cutting blade, packaging container and packaging material supply device for packaging container

The present invention relates to a cutting blade, a packaging container and a packaging material supply device for a packaging container.

A packaging container for accommodating and packaging a wrap film wound in a roll shape includes a zigzag cutting blade for cutting a packaging film drawn from the packaging container. As such a cutting blade, a straight shape extending in a direction parallel to the central axis of the roll-shaped packaging film and a V-shape having a center at the center of the center axis in the direction parallel to the central axis are generally known. By. The method of cutting the packaging film drawn from the packaging container by the cutting blade should be changed according to the shape of the cutting blade.

When the packaging film is cut using a straight-shaped cutting blade, first, one of the two side edges of the packaging film drawn from the packaging container is placed on the corresponding one of the two ends of the cutting blade. Then, the packaging film drawn from the tooth tip of the cutting blade is pulled toward the tooth root. At this time, the teeth at the end of the cutting edge are first pierced into the packaging film, and thereafter, the packaging film is cut from one of the side edges of the packaging film toward the other.

When the W-shaped cutting blade is used to cut the packaging film, first, the center of both side edges of the packaging film drawn from the packaging container is placed in the central portion of the cutting edge in a direction parallel to the central axis. . Then, the packaging container (cutting blade) is rotated about a rotation axis parallel to the central axis. At this time, the teeth located at the central portion of the cutting edge are first pierced into the packaging film, and thereafter, the packaging film is cut from the center of the packaging film toward both side edges.

As described above, the linear cutting edge is used to cut the packaging film from one of the side edges of the packaging film toward the other side, and the V-shaped cutting edge is used for the two self-wrapping films. The center of the side edge cuts the packaging film toward both side edges. In this case, the V-shaped cutting blade has a uniform tension applied to the packaging film at the time of cutting as compared with the linear cutting blade, and the cutting of the packaging film is made reliable and easy.

In order to further improve the cutting property of the V-shaped cutting edge, for example, as disclosed in Patent Document 1, a method of causing the tip of the tooth located at both ends of the cutting edge to face the center of the cutting edge has been proposed. In this case, the teeth located at both ends of the cutting edge are easily pierced into the packaging film immediately before the cutting of the packaging film is completed. This method makes it easy to cut the packaging film.

Patent Document 1: Japanese Patent Laid-Open No. Hei 5-178344

The V-shaped cutting edge is designed on the premise that the packaging film is cut from the center of both side edges of the packaging film toward both side edges. That is, the V-shaped cutting blade is used in such a manner that it exhibits good cutting properties.

However, the user of the packaging container does not always have to confirm the shape of the cutting blade, and even if the shape of the cutting blade is confirmed, the user does not necessarily cut the packaging film by a method suitable for the shape. For example, although the shape of the cutting blade is V-shaped, the cutting of the packaging film may proceed from one of the side edges of the packaging film toward the other. In this case, it is difficult to cause the teeth located at the end of the V-shaped cutting edge to be inserted into the packaging film to start cutting. As disclosed in Patent Document 1, when the tip of the tooth located at both ends of the cutting edge is directed toward the center of the cutting edge, it is more difficult to cause the teeth to penetrate the packaging film and start cutting.

Accordingly, it is an object of the present invention to provide a cutting blade for a packaging container, and a packaging container and a packaging material supply device including the cutting blade, the cutting blade for the packaging container being regardless of a central portion of the cutting blade When the tip of the tooth tip and the tip of the tip portion are first inserted into a packaging material such as a packaging film to start cutting the packaging material, the person who cuts the packaging material can be satisfactorily performed.

In order to achieve the above object, in one aspect of the invention, a cutting blade for use in a packaging container for storing a packaging material wound into a roll shape for cutting a packaging material is provided. Since the cutting blade extends in a direction parallel to the central axis of the roll-shaped packaging material, the packaging material is cut by the cutting edge in a direction parallel to the central axis. The cutting blade includes: a central portion having a plurality of tooth tips arranged in a V shape at a vertex of a center of the cutting edge in a direction parallel to the central axis; and an end portion provided in the central portion side. Each end portion has a plurality of tooth tips arranged in a straight line. The arrangement of the tips of the end portions extends at an angle to the corresponding one of the ends of the arrangement of the tips of the central portion. Each of the tooth tips of the end portion is included in a corresponding one of a plurality of teeth provided at the end portion. Each of the tooth tips of the end portion is in a direction parallel to the central axis and corresponds to an intermediate position between one of the plurality of roots and the adjacent root, or a direction parallel to the central axis from the intermediate position Off the outside.

In another aspect of the invention, a packaging container for storing a packaging material wound into a roll shape is provided. The packaging container includes the above-described cutting blade in order to cut the packaging material.

In still another aspect of the present invention, a packaging container comprising the packaging container and a roll-shaped packaging material housed in the packaging container is provided.

Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 7 .

The packaging material supply device 10 of the present embodiment shown in Fig. 1 includes a packaging film 12 as a packaging material and a packaging container for accommodating the packaging film 12. The packaging container comprises an elongated box-like container body 13. The upper portion of the container body 13 is formed as an opening. The cover 14 extends from the upper edge 13a of the rear wall of the container body 13. The cover 14 can block the opening of the container body 13. The lid body 14 is formed integrally with the container body 13. The packaging film 12 is wound around a cylindrical paper tube 11 to form a roll shape. Therefore, the central axis of the roll-shaped packaging film 12 coincides with the central axis of the paper tube 11. In Fig. 1, the central axis of the roll-shaped packaging film 12 is indicated by a dotted line. Further, in Fig. 1, a direction parallel to the central axis of the roll-shaped packaging film 12 is indicated by a double-headed arrow A. Hereinafter, a direction parallel to the central axis of the roll-shaped packaging film 12 is also referred to as a central axis direction A. When the lid 14 is opened to open the container body 13, the packaging film 12 can be taken out from the packaging container together with the paper tube 11, or the packaging film 12 can be withdrawn from the packaging container. When the lid 14 blocks the opening of the container body 13, a portion of the packaging film 12 drawn from the front side of the container body 13 toward the front side of the container body 13 can be temporarily stopped between the front wall of the container body 13 and the lid body 14.

The front wall lower edge 14a of the lid body 14 includes a V-shaped central portion having the center of the lower edge 14a in the central axis direction A as a vertex, and a straight line extending on both sides of the central portion and extending along the central axis direction A. The sides of the shape. A cutting edge 20 is attached to the back surface of the front wall of the lid body 14. The cutting edge 20 has a plurality of tooth tips arranged along the lower edge 14a. The container body 13 is formed, for example, of one piece of thick paper, preferably one piece of copperplate paper. The packaging film 12 is formed, for example, of polyvinylidene chloride. In the present embodiment, the packaging container is composed of the container body 13, the lid body 14, and the cutting blade 20. The packaging material supply device 10 is composed of a packaging container and a packaging film 12 wound into a roll.

When the packaging film supply device 10 is used to cut the packaging film 12 from the center of the packaging film 12 in the direction of the central axis A, that is, the center of both side edges of the packaging film 12, the packaging film 12 is first grasped with one hand. At the front end, the container body 13 is held with the other hand. After the packaging film 12 of the desired length is taken out from the container body 13, the thumb is held by the thumb of the hand holding the container body 13 and held near the center of the front wall of the lid body 14, centering on the axis of rotation parallel to the central axis direction A. The container body 13 is twisted. Thereby, the teeth located at the central portion of the cutting blade 20 are first pierced into the packaging film 12. Thereafter, the packaging film 12 is cut by further twisting the container body 13.

When the packaging material supply device 10 is used to cut the packaging film 12 from one of the side edges of the packaging film 12 toward the other side, first grasp the front end of the packaging film 12 near the side edge with one hand, and use the other The container body 13 is held by only one hand. After the desired length of the packaging film 12 is withdrawn from the container body 13, the side of the front wall of the lid 14 is held by the hand holding the container body 13, and the packaging film 12 grasped by the other hand is pulled up. Thereby, the teeth of the corresponding one of the both end portions of the cutting edge 20 are first pierced into the packaging film 12. Thereafter, the packaging film 12 is cut by further pulling up the packaging film 12.

As shown in FIG. 2, a sealant 15 and an adhesive layer 16 are provided between the back surface 14b of the front wall of the lid 14 and the cutting edge 20. The cutting edge 20 is followed by the sealant 15 by the adhesive layer 16. The sealant 15 is attached to the back surface 14b of the lid 14 by ultrasonic bonding. The sealant 15 is formed, for example, of a material mainly composed of an ethylene/methacrylic acid copolymer. The layer 16 is then formed, for example, from a polyurethane based adhesive. Thereby, the cutting blade 20 is attached to the lid body 14 via the sealant material 15 and the adhesive layer 16 with sufficient strength that is less likely to fall off from the lid body 14.

As shown in FIG. 3, the cutting blade 20 includes a V-shaped central portion 21 having a V-shape at the center of the cutting edge 20 in the central axis direction A. The central portion 21 has a plurality of tooth tips arranged along the lower edge of the central portion 21. That is, the central portion 21 has a plurality of tooth tips that are arranged in a V shape with the center of the cutting edge 20 as a vertex in the central axis direction A. The central portion 21 is line-symmetric with the center line CL extending through the center of the cutting edge 20 and extending orthogonal to the central axis direction A. The central portion 21 includes a first central portion 21A including the apex of the V-shape depicted by the central portion 21, one of the two sides of the first central portion 21A, the second central portion 21B, and the two ends respectively including the V-shape. A pair of third central portions 21C. The teeth provided in the first central portion 21A, the teeth provided in the second central portion 21B, and the teeth provided in the third central portion 21C are different in shape from each other. End portions 22 extend from the ends of the central portion 21, respectively. Each of the end portions 22 has a plurality of tooth tips arranged linearly along the central axis direction A.

The inner angle θ of the V-shape of the central portion 21 is, for example, 172.5°. The size of the cutting edge 20 in the central axis direction A, that is, the blade width W20 is, for example, 304 mm. The first central portion 21A in the central axis direction A, the respective second central portions 21B, the respective third central portions 21C, and the respective end portions 22 are the first central portion width Wa, the second central portion width Wb, and the third The central portion width Wc and the end portion width We are, for example, 39.13 mm, 70.2 mm, 35.26 mm, and 26.98 mm, respectively.

The cutting blade 20 is preferably formed of a non-metal such as paper, vulcanized fiber, resin impregnated paper, or resin. Examples of the resin include, for example, PET (polyethylene terephthalate) or polystyrene. When it is necessary to particularly consider the environment, a biodegradable resin can also be used. Typical examples of the biodegradable resin include polylactic acid or polyglycolic acid. Among them, a cutting blade formed by biaxially stretching a polylactic acid-based resin composition, more specifically, a sheet obtained by biaxially stretching a polylactic acid-based resin composition is preferable. A cutting blade formed by press working or laser cutting is performed. The cutting blade 20 may contain an inorganic filler in addition to the resin, and may further contain a heat stabilizer, a light stabilizer, a water repellent material, a mold release agent, a pigment, and a dye.

As shown in FIG. 4, the first central portion 21A of the cutting blade 20 includes a plurality of large teeth 31 as a first center tooth, a plurality of middle teeth 32 as a second center tooth, and a plurality of small teeth 33. 4 of the first central portion 21A showing the right half of the left and right symmetrical cutting edges 20, three of the large teeth 31, four of the middle teeth 32, and the small teeth 33 are shown in FIG. One. One of the large teeth 31 has a tooth tip located at the apex of the V-shape of the central portion 21. The large teeth 31 are arranged such that the intervals between the adjacent large teeth 31 are fixed. The teeth 32 located between the two positions of the teeth 32 located near the apex of the V-shape near the central portion 21 shown in Fig. 4 are located adjacent to the apex, respectively, corresponding to one of the corresponding pairs Between the teeth 31. A line L1 formed by connecting the tips of the adjacent large teeth 31 in a straight line is located away from the middle teeth 32. Each of the small teeth 33 is located between two of the middle teeth 32 at a position away from the apex of the V-shape of the central portion 21, wherein the middle teeth 32 are located at the left and right halves of the first central portion 21A. Corresponding to one side. The middle teeth 32 and the small teeth 33 help to smoothly penetrate the tip of the cutting edge 20 of the packaging film 12 and the cutting of the packaging film 12 thereafter from the first central portion 21A of the cutting blade 20. To the second central portion 21B.

The large teeth 31, the middle teeth 32, and the small teeth 33 respectively have a pair of arcuate oblique sides that are recessed toward the inner side of the teeth. The angle formed by the tangent lines of the two arcuate oblique sides on the tooth tips of the large teeth 31, the middle teeth 32, and the small teeth 33 is the first tooth tip angle θa, which is set to be suitable for the tooth tip to penetrate into The angle of the packaging film 12. Specifically, when the packaging film 12 is made of polyvinylidene chloride, the first tip angle θa is preferably from 30 to 90, more preferably from 40 to 70. If the first tip angle θa is larger than 90°, the force required for the tip of the tooth to penetrate into the packaging film 12 may become extremely large. When the first tip angle θa is less than 30°, the durability of the teeth may be lowered.

The maximum size of each of the large teeth 31, the intermediate teeth 32, and the small teeth 33 in the central axis direction A, that is, the large tooth width W1, the middle tooth width W2, and the small tooth width W3 are set in the same manner as the first tooth tip angle θa. It is suitable for the tip of the tooth to penetrate into the size of the packaging film 12. Among them, the relationship of the large tooth width W1>the middle tooth width W2>the small tooth width W3 is satisfied. The distance between the straight line connecting the two roots of each of the large teeth 31 and the tooth tip along the center line CL, the line connecting the two roots of each of the middle teeth 32, and the center line between the tooth tips The distance between CL and the distance between the straight line connecting the two roots of each small tooth 33 and the tooth tip along the center line CL, that is, the large tooth height, the middle tooth height, and the small tooth height, also with the first tooth The sharp angle θa is similarly set to a size suitable for piercing the tip of the tooth to the packaging film 12. Among them, the relationship between the large tooth height>the middle tooth height>the small tooth height is satisfied. In the present embodiment, the first tooth tip angle θa, the large tooth width W1, the middle tooth width W2, the small tooth width W3, the large tooth height, the middle tooth height, and the small tooth height are set as follows. 1st tip angle θa: 45°~60°, large tooth width W1: 3.25mm, middle tooth width W2: 2.49mm, small tooth width W3: 1.32mm, large tooth height: 1.7mm, middle tooth height: 1.2mm , small tooth height: 0.8mm.

One of the large teeth 31 and the middle teeth 32 has a radius of curvature smaller than the oblique side of the oblique side located at the vertex of the V-shape near the central portion 21, that is, the inner oblique side (the left side oblique side in FIG. 4) The radius of curvature of the oblique side located at the position away from the vertex, that is, the oblique side of the outer side (the oblique side of the right side in FIG. 4). Therefore, the respective tooth tips of the large teeth 31 and the middle teeth 32 are opposite to the intermediate position between the adjacent ones of the adjacent roots in the central axis direction A toward the apex side of the V-shape of the central portion 21, that is, the inner side.

More specifically, the large tooth width W1 is divided into the inner large tooth width W1c and the outer large tooth width W1e by a line extending through the tooth tip of each large tooth 31 orthogonal to the central axis direction A. At this time, the relationship between the inner large tooth width W1c and the outer large tooth width W1e is satisfied. Further, the middle tooth width W2 is divided into the inner middle tooth width W2c and the outer middle tooth width W2e by a line extending through the tooth tip of each of the intermediate teeth 32 orthogonal to the central axis direction A. At this time, the relationship between the inner middle tooth width W2c <the outer middle middle tooth width W2e is satisfied. Further, the small tooth width W3 is divided into the inner small tooth width W3c and the outer small tooth width W3e by a line extending through the tooth tip of each small tooth 33 orthogonal to the central axis direction A. At this time, the relationship of the inner small tooth width W3c <the outer small tooth width W3e is satisfied.

Therefore, when the packaging film 12 is cut from the center of the packaging film 12 in the direction of the central axis A, since the tip of the first central portion 21A faces the packaging film 12, the tip of the first central portion 21A is located. The position near the apex of the V-shape of the central portion 21 is sequentially penetrated into the packaging film 12 without much resistance. At this time, at the initial stage of cutting, only the large teeth 31 of a relatively large size are pierced into the packaging film 12, so that the required load is small at the initial stage of cutting. Further, since the teeth 32 are provided between the large teeth 31 in a relatively small size, the subsequent cutting of the packaging film 12 can be smoothly performed.

In the present embodiment, the radius of curvature R1c of the oblique side of the inner side of each of the large teeth 31 and the radius of curvature R1e of the outer side of the oblique side are 3.19 mm and 3.42 mm, respectively. The radius of curvature R2c of the oblique side of the inner side of each of the middle teeth 32 and the radius of curvature R2e of the outer side of the oblique side are 2.08 mm and 2.31 mm, respectively. The radius of curvature R3c of the oblique side of the inner side of each of the small teeth 33 and the radius of curvature R3e of the outer side of the oblique side are both 3.2 mm. The inner large tooth width W1c and the outer large tooth width W1e of each of the large teeth 31 are 1.47 mm and 1.78 mm, respectively. The inner middle tooth width W2c and the outer middle middle tooth width W2e of each of the middle teeth 32 are 1.13 mm and 1.36 mm, respectively. The inner small tooth width W3c and the outer small tooth width W3e of each of the small teeth 33 are 0.61 mm and 0.71 mm, respectively.

As shown in FIG. 5, each of the second central portions 21B of the cutting blade 20 has a plurality of second teeth 34. The second teeth 34 contribute to the smoothing of the cutting of the cutting edge of the cutting edge 20 of the packaging film 12 and the cutting of the packaging film 12 from the first central portion 21A of the cutting blade 20 to the third Central part 21C.

Each of the second teeth 34 has a pair of arcuate bevels that are recessed toward the inside of the teeth. The second notch angle θb, which is an angle formed by the tangent lines of the two arcuate oblique sides on the tooth tips of the second teeth 34, is set to be suitable for piercing the tooth tip in the same manner as the first tooth tip angle θa. To the angle of the packaging film 12. The second tooth width W4, which is the largest dimension of each of the second teeth 34 in the central axis direction A, is set to a size suitable for the tip of the tooth to penetrate the packaging film 12 similarly to the second tooth tip angle θb. However, the relationship between the middle tooth width W2>the second tooth width W4>the small tooth width W3 is satisfied. The distance between the straight line connecting the two roots of each of the second teeth 34 and the tooth tip along the center line CL, that is, the second tooth height is set to be suitable for the tooth tip as in the second tooth tip angle θb. The size of the packaging film 12 is entered. Among them, the relationship between the height of the teeth in the second tooth height ≦ is satisfied. The second tooth tip angle θb, the second tooth width W4, and the second tooth height in the present embodiment are set as follows. The second tooth tip angle θb: 60°, the second tooth width W4: 1.8 mm, and the second tooth height: 1.2 mm.

One of the second teeth 34 has a curvature radius R4c which is located at a position opposite to the vertex of the V-shape near the central portion 21, that is, the inner oblique side (the left side oblique side in FIG. 5), which is smaller than The oblique side of the position where the vertex leaves, that is, the radius of curvature R4e of the outer oblique side (the right middle oblique side in Fig. 5). Therefore, the intermediate position between the tooth tips of the respective second teeth 34 with respect to the pair of adjacent ones is offset to the inner side of the V-shaped apex side of the central portion 21 in the central axis direction A. The amount of deviation of the tooth tip of the second tooth 34 is also smaller than the amount of deviation of the tooth tip of the large tooth 31 and the middle tooth 32 of the first central portion 21A.

More specifically, the second tooth width W4 is divided into the inner second tooth width W4c and the outer second tooth width W4e by a line extending through the tooth tip of each of the second teeth 34 and orthogonal to the central axis direction A. . At this time, the relationship between the inner second tooth width W4c and the outer second tooth width W4e is satisfied. Further, the inner second tooth width W4c/outer second tooth width W4e is larger than the inner large tooth width W1c/outer large tooth width W1e, the inner middle tooth width W2c/outer middle tooth width W2e, and the inner small tooth width W3c/outer small tooth Any of the widths W3e.

Therefore, when the packaging film 12 is cut from the center of the packaging film 12 in the direction of the central axis A, since the tooth tip of the second central portion 21B is oriented toward the packaging film 12, the tip of the second central portion 21B From the position of the apex of the V-shape near the central portion 21, the packaging film 12 is pierced without much resistance.

On the other hand, when the packaging film 12 is cut from one of the side edges of the packaging film 12 toward the other, the position of the tooth tips of the first central portion 21A and the second central portion 21B is from the central portion 21 When the apex of the V-shape is separated, the more the tooth tip is toward the packaging film 12, the tip of the second central portion 21B is pierced without resistance from the position of the V-shaped apex from the central portion 21. To the packaging film 12.

In the present embodiment, the curvature radius R4c of the oblique side of the inner side of each of the second teeth 34 and the curvature radius R4e of the outer oblique side are 5.5 mm and 7.38 mm, respectively. The inner second tooth width W4c and the outer second tooth width W4e of each of the second teeth 34 are 0.88 mm and 0.92 mm, respectively.

As shown in FIG. 6, each of the third central portions 21C of the cutting blade 20 has a plurality of third teeth 35. The third tooth 35 facilitates the smooth transfer of the tip end of the cutting edge 20 of the packaging film 12 and the cutting of the second central portion 21B from the cutting edge to the end portion 22.

Each of the third teeth 35 has a pair of arcuate bevels that are recessed toward the inner side of the teeth. The third tooth tip angle θc, which is an angle formed by the tangent lines of the two arcuate oblique sides of the tooth tips of the third teeth 35, is set to be suitable for piercing the tooth tip in the same manner as the second tooth tip angle θb. The angle of the packaging film 12. The third tooth width W5, which is the largest dimension of each of the third teeth 35 in the central axis direction A, is set to a size suitable for the tip of the tooth to penetrate the packaging film 12 similarly to the second tip angle θb. However, the relationship between the middle tooth width W2>the third tooth width W5>the second tooth width W4 is satisfied. The distance between the straight line connecting the two roots of each of the third teeth 35 and the tooth tip along the center line CL, that is, the third tooth height, is set to be suitable for the tooth tip as in the second tooth tip angle θb. The size of the packaging film 12 is entered. Wherein, the third tooth height is equal to the middle tooth height. The third tooth tip angle θc, the third tooth width W5, and the third tooth height in the present embodiment are set as follows. The third tooth tip angle θc: 60°, the third tooth width W5: 1.85 mm, and the third tooth height: 1.2 mm.

The radius of curvature R5c of the oblique side of the inner side of the oblique edge of the one of the third teeth 35 located at the vertex of the V-shape near the central portion 21 (the oblique side of the left side in FIG. 6) is smaller than The oblique side of the position where the vertex leaves, that is, the outer side of the oblique side (the right side of the oblique side in Fig. 6) has a radius of curvature R5e. Therefore, the intermediate position between the tooth tips of the respective third teeth 35 with respect to the pair of adjacent ones is offset to the inner side of the V-shaped apex side of the central portion 21 in the central axis direction A. The amount of deviation of the tooth tip of the third tooth 35 is substantially equal to the amount by which the tooth tip of the second tooth 34 of the second central portion 21B is offset.

More specifically, the third tooth width W5 is divided into the inner third tooth width W5c and the outer third tooth width W5e by a line extending through the tooth tip of each of the third teeth 35 so as to be orthogonal to the central axis direction A. At this time, the relationship between the inner third tooth width W5c and the outer third tooth width W5e is satisfied. Moreover, the ratio of the third tooth width W5e on the outer side with respect to the inner third tooth width W5c is substantially equal to the ratio of the second tooth width W4e on the outer side with respect to the inner second tooth width W4c.

Therefore, when the packaging film 12 is cut from the center of the packaging film 12 in the direction of the central axis A, the tip of the third central portion 21C is oriented toward the packaging film 12, so that the tip of the third central portion 21C is self-contained. The position of the apex of the V-shape near the central portion 21 is sequentially penetrated into the packaging film 12 without much resistance.

On the other hand, when the packaging film 12 is cut from one of the side edges of the packaging film 12 toward the other, in the entirety of the central portion 21, the position of the tooth tip is V-shaped from the central portion 21. When the apex is separated, the more the tooth tip faces the packaging film 12, the tip of the central portion 21 penetrates into the packaging film 12 without much resistance from the position at the position of the V-shaped apex from the central portion 21.

In the present embodiment, the radius of curvature R5c of the oblique side of the inner side of each of the third teeth 35 and the radius of curvature R5e of the outer side of the oblique side are 5.1 mm and 6.57 mm, respectively. The inner third tooth width W5c and the outer third tooth width W5e of each of the third teeth 35 are 0.9 mm and 0.95 mm, respectively.

As shown in FIG. 7, each end portion 22 of the cutting edge 20 includes a plurality of end teeth 36. The end teeth 36 help to smoothly start cutting the packaging film 12 from the end portion 22 of the cutting edge 20.

Each of the end teeth 36 has a pair of arcuate bevels that are recessed toward the inside of the teeth. The end tooth tip angle θ22, which is an angle formed by the tangent of the two arcuate oblique sides of the tooth tips of the end teeth 36, is set to be suitable for the tip of the tooth to be inserted into the package, similarly to the first tip angle θa. The angle of the film 12. The maximum dimension of each of the end teeth 36 in the central axis direction A, that is, the end tooth width W22 is set to a size suitable for the tip of the tooth to penetrate the packaging film 12, similarly to the first tip angle θa. The end tooth width W22 is equal to the second tooth width W4. The distance between the straight line connecting the two roots of each of the end teeth 36 and the tooth tip along the center line CL, that is, the end tooth height, is set to be suitable for the tip of the tooth to be penetrated to the same as the first tip angle θa The size of the packaging film 12. Among them, the relationship between the height of the end teeth and the height of the teeth is satisfied. The end tooth tip angle θ22, the end tooth width W22, and the end tooth height in the present embodiment are set as follows. The tip tooth tip angle θ22: 60°, the end tooth width W22: 1.8 mm, and the end tooth height: 1.2 mm.

The radius of curvature R22c of one of the end teeth 36 of the pair of oblique sides located at the position of the apex of the V-shape near the central portion 21, that is, the oblique side of the inner side (the oblique side of the left side in FIG. 7) is larger than The oblique side of the position where the vertex leaves, that is, the outer side of the oblique side (the right side of the oblique side in Fig. 7) has a radius of curvature R22e. Therefore, the tip end of each of the end teeth 36 is offset to the outer side corresponding to the end side of the cutting edge 20 in the central axis direction A with respect to the intermediate position between the corresponding one of the adjacent roots.

More specifically, the end tooth width W22 is divided into an inner end tooth width W22c and an outer end tooth width W22e by a line extending through the tooth tip of each end tooth 36 orthogonal to the central axis direction A. At this time, the relationship of the inner end tooth width W22c>the outer end tooth width W22e is satisfied. Further, the relationship between the inner end tooth width W22c/outer end tooth width W22e>the inner third tooth width W5c/the outer third tooth width W5e is satisfied.

When the packaging film 12 is cut from the center in the central axis direction A of the packaging film 12, the tooth tip of the end portion 22 does not face the packaging film 12, but the packaging film is formed by the teeth of the previous central portion 21. After the cutting of 12, the packaging film 12 has become weak, so that the cutting of the packaging film 12 by the end portion 22 is not difficult.

On the other hand, when the packaging film 12 is cut from one of the side edges of the packaging film 12 toward the other, since the tip of the end portion 22 is oriented toward the packaging film 12, the tip of the end portion 22 From the position on the corresponding end side of the cutting edge 20, the packaging film 12 is pierced without much resistance. At this time, the arrangement of the tips of the end portions 22 and the corresponding one of the ends of the arrangement of the tips of the central portion 21 extend at an angle, so that the tip of the end portion 22 is larger than the large teeth 31 of the central portion 21. The tip of the tooth penetrates into the packaging film 12 first.

In the present embodiment, the radius of curvature R22c of the oblique side of the inner end of each of the end teeth 36 and the radius of curvature R22e of the outer side of the oblique side are 7.38 mm and 5.5 mm, respectively. The inner end tooth width W22c and the outer end tooth width W22e of each end tooth 36 are 1.0 mm and 0.8 mm, respectively.

According to the above embodiment, the following effects can be obtained.

When the packaging film 12 is cut from the center of the packaging film 12 in the direction of the central axis A, since the tip of the central portion 21 is oriented toward the packaging film 12, the tip of the central portion 21 is located close to the central portion 21 The position of the apex of the V-shape is smoothly penetrated into the packaging film 12 in order. Further, when the packaging film 12 is cut from one of the side edges of the packaging film 12 toward the other, since the tip of the end portion 22 is oriented toward the packaging film 12, the tip of the end portion 22 is self-located. The position of the corresponding end side of the cutting blade 20 is smoothly penetrated into the packaging film 12 in order. Therefore, the packaging film 12 can be cut satisfactorily regardless of which of the tooth tip of the central portion 21 of the cutting blade 20 and the tip of the end portion 22 is first penetrated into the packaging film 12 to start cutting the packaging film 12. .

Each end tooth 36 of the end portion 22 has a pair of oblique sides that are recessed toward the inside of the tooth. Therefore, the end tip angle θ22 can be reduced without greatly reducing the durability of the end teeth 36. The tip end point angle θ22 is small, which facilitates the smooth penetration of the end tooth 36 into the packaging film 12.

The more the tooth tip of the cutting blade 20 is located away from the apex of the V-shape of the central portion 21, the more the corresponding one of the adjacent roots is located further outward in the central axis direction A. This will improve the cuttability of the packaging film 12 by the cutting blade 20.

The above embodiment can also be modified as follows.

In the above embodiment, the end teeth 36 of the end portions 22 are continuously arranged along the central axis direction A. However, the present invention is not limited thereto. For example, as shown in FIG. 8, each end portion 22 may include a flat portion 37 provided along the central axis direction A between adjacent end teeth 36. That is, the end teeth 36 of the respective end portions 22 may be intermittently arranged along the central axis direction A. When the cut surface of the packaging film 12 is present in a portion extending in the circumferential direction of the roll-shaped packaging film 12, the packaging film 12 is easily torn in the circumferential direction with the above-mentioned portion as the opening end. In the configuration including the flat portion 37, the cut surface of the packaging film 12 has a shape along the central axis direction A, so that the tear of the packaging film 12 is suppressed. However, if the ratio of the flat portion 37 to the end portions 22 is excessively large, it is easy to generate resistance at the end portion 22 when the packaging film 12 is cut. Therefore, it is preferable to set the flatness within a range in which the above resistance is not generated. The portion 37 occupies a ratio of each end portion 22.

The tip of each end tooth 36 of the end portion 22 may also coincide with the intermediate position between the central axis direction A and the corresponding one of the adjacent roots. In this case as well, when the packaging film 12 is cut from one of the side edges of the packaging film 12 toward the other, since the tip of the end portion 22 faces the packaging film 12, the teeth of the end portion 22 The tip is smoothly penetrated into the packaging film 12 in order from the position where the apex of the V-shape of the central portion 21 is located.

The tooth width and the tooth height of each of the end teeth 36 of the end portion 22 are not necessarily fixed or different. For example, as shown in FIG. 9, each end portion 22 of the cutting edge 20 may also include a direction A along the central axis. Large teeth 36B and small teeth 36S of different sizes are alternately arranged. The large teeth 36B and the small teeth 36S respectively have a pair of arcuate oblique sides that are recessed toward the inner side of the teeth. The angle formed by the tangent lines of the two arc-shaped oblique sides on the tooth tips of the large teeth 36B, that is, the large tooth tip angle θ6b, and the tangent of the two arc-shaped oblique sides on the tooth tips of the small teeth 36S are mutually The angle formed, that is, the small tooth tip angle θ6s, is set to an angle suitable for piercing the tooth tip into the packaging film 12. Specifically, when the packaging film 12 is made of polyvinylidene chloride, the large tooth tip angle θ6b and the small tooth tip angle θ6s are preferably 30° to 90°, more preferably 40° to 70°. The maximum size of each of the large teeth 36B and the small teeth 36S in the central axis direction A, that is, the large tooth width W6B and the small tooth width W6S, is set to be suitable for the tip of the tooth to penetrate the packaging film 12. Among them, the relationship of the large tooth width W6B>small tooth width W6S is satisfied. The distance between the straight line connecting the major teeth 36B and the two roots on each of the small teeth 36S and the tooth tip along the center line CL, that is, the large tooth height and the small tooth height, is set to be suitable for piercing the tooth tip. To the size of the packaging film 12. among them. Meet the relationship between large tooth height > small tooth height. The large tooth tip angle θ6b, the small tooth tip angle θ6s, the large tooth width W6B, the small tooth width W6S, the large tooth height, and the small tooth height are set, for example, as follows. Large tooth tip angle θ6b: 45°, small tooth tip angle θ6s: 45°, large tooth width W6B: 3.26 mm, small tooth width W6S: 2.5 mm, large tooth height: 1.7 mm, small tooth height: 1.2 mm.

The oblique side of the one of the large teeth 36B and the small teeth 36S shown in FIG. 9 opposite to the vertex of the V-shape near the central portion 21 is the oblique side of the inner side (the oblique side of the left side in FIG. 9). The radius of curvature is larger than the radius of curvature of the oblique side (the right side of the oblique side in FIG. 9) of the oblique side located at the position away from the vertex. Therefore, the positions of the respective tooth tips of the large teeth 36B and the small teeth 36S are offset from the center position direction A toward the end side corresponding to the cutting edge 20, that is, the intermediate position between the adjacent ones. More specifically, the large tooth width W6B is divided into an inner large tooth width W6Bc and an outer large tooth width W6Be by a line extending through the tooth tip of each large tooth 36B orthogonal to the central axis direction A. At this time, the relationship of the inner large tooth width W6Bc>the outer small tooth width W6Se is satisfied. Further, the small tooth width W6S is divided into an inner small tooth width W6Sc and an outer small tooth width W6Se by a line extending through the tooth tip of each small tooth 36S orthogonal to the central axis direction A. At this time, the relationship of the inner small tooth width W6Sc>the outer small tooth width W6Se is satisfied. The radius of curvature R6Bc of the oblique side of the inner side of each large tooth 36B and the curved radius R6Be of the outer side of the oblique side are 3.42 mm and 3.19 mm, respectively. The radius of curvature R6Sc of the oblique side of the inner side of each of the small teeth 36S and the radius of curvature R6Se of the outer side of the oblique side are respectively 2.31 mm and 2.08 mm. The inner large tooth width W6Bc and the outer large tooth width W6Be of each large tooth 36B are 1.9 mm and 1.36 mm, respectively. The inner small tooth width W6Sc and the outer small tooth width W6Se of each small tooth 36S are 1.44 mm and 1.05 mm, respectively.

According to the configuration including the end portion 22 as shown in Fig. 9, when the packaging film 12 is cut from one of the side edges of the packaging film 12 toward the other, at the initial stage of cutting, only a relatively large size is used. The large teeth 36B penetrate into the packaging film 12, so that the required load is small at the initial stage of cutting. Further, since the relatively small-sized small teeth 36S are provided between the large teeth 36B, the subsequent cutting of the packaging film 12 can be smoothly performed. Furthermore, the greater the number of teeth that are pierced into the packaging film 12 at a time, the greater the load required to cut the packaging film 12. Therefore, it is also possible to reduce the load required at the initial stage of cutting by setting one of the end teeth 36 of the end portion 22 shown in Fig. 7 to a larger tooth than the end tooth 36.

The teeth provided on the cutting edge 20 do not necessarily have a pair of arcuate oblique sides that are recessed toward the inner side of the teeth. For example, one or both of the two oblique sides of each tooth may be linear, or may be an arc shape convex toward the outer side of the tooth.

The shape of the teeth of the first central portion 21A, the second central portion 21B, and the third central portion 21C of the central portion 21 may not necessarily be different. For example, the teeth of the second central portion 21B and the third central portion 21C may have the same shape as the teeth of the first central portion 21A, and the teeth of the third central portion 21C may be set to be the second central portion. The shape of the teeth of 21B is the same.

Instead of the packaging film 12, aluminum foil or paper may be used as the packaging material.

The tip of each end portion 22 that is linearly arranged is not limited to the direction A along the central axis. For example, as shown in FIG. 10, the tip of each end portion 22 may also be located on the lower side as it exits from the central portion 21. In this case, the shape of the cutting blade 20 can be made into a substantially M shape. The tooth tips of the end portions 22 are located at the uppermost portion of the cutting blade 20 and extend along the central axis direction A, and the first reference line LB extending along the central axis direction A and the lowermost portion connecting the cutting edges 20 to extend along the central axis direction A. 2 The reference line LT (indicated by a little chain line in Fig. 10). The angle θe formed by the straight line passing through the tip of each end portion 22 and the first reference line LB is, for example, 8°.

According to the cutting blade 20 shown in Fig. 10, when the packaging film 12 is cut from one of the side edges of the packaging film 12 toward the other, the tip end portion 22 has a tooth tip which is larger than the central portion 21. The tip of the tooth is more accurately penetrated into the packaging film 12 first. Further, when the packaging film 12 is cut from the center of the packaging film 12 in the direction of the central axis A, since the tip of the end tooth 36 is not located lower than the second reference line LT, it is located at the center portion. The tip of the large tooth 31 of the apex of the V of 21 is more surely pierced into the wrapper film 12 than the tip of the tip end portion 22. Therefore, the packaging film 12 can be smoothly cut regardless of the method of cutting the packaging film 12 by any means.

10. . . Packaging material supply device

11. . . Paper Tube

12. . . wrap

13. . . Container body

13a. . . Upper edge

14. . . Cover

14a. . . Lower edge

14b. . . back

15. . . Sealant

16. . . Next layer

20. . . Cutting edge

twenty one. . . Central part

21A. . . First central part

21B. . . Second central part

21C. . . Third central part

twenty two. . . End part

31, 36B. . . Large tooth

32. . . Middle tooth

33, 36S. . . Small tooth

34. . . 2nd tooth

35. . . Third tooth

36. . . End tooth

37. . . Flat part

A. . . Central axis direction

CL. . . Center line

L1. . . line

LB. . . First baseline

LT. . . 2nd baseline

R1c, R1e, R2c, R2e, R3c, R3e, R4c, R4e, R5c, R5e, R6Bc, R6Be, R6Sc, R6Se, R22c, R22e. . . Radius of curvature

W1, W6B. . . Large tooth width

W1c, W6Bc. . . Inner large tooth width

W1e, W6Be. . . Outer large tooth width

W2. . . Middle tooth width

W2c. . . Medial middle tooth width

W2e. . . Outer middle tooth width

W3, W6S. . . Small tooth width

W3c, W6Sc. . . Inner small tooth width

W3e, W6Se. . . Outer small tooth width

W4. . . 2nd tooth width

W4c. . . Inner second tooth width

W4e. . . Outer 2nd tooth width

W5. . . 3rd tooth width

W5c. . . Inner third tooth width

W5e. . . Outer third tooth width

W20. . . Blade width

W22. . . End tooth width

W22c. . . Inner end tooth width

W22e. . . Outer end tooth width

Wa. . . First central part width

Wb. . . 2nd central part width

Wc. . . 3rd central part width

We. . . End portion width

θ. . . Inner angle

Θ6b. . . Large tooth angle

Θ6s. . . Small tip angle

Θ22. . . End tip angle

Θa. . . 1st tip angle

Θb. . . 2nd tip angle

Θc. . . Third tooth tip angle

Θe. . . angle

Figure 1 is a perspective view of a packaging material supply device according to an embodiment of the present invention;

Figure 2 is a cross-sectional view showing a portion of the packaging material supply device shown in Figure 1 in which a cutting blade is attached to a lid of a packaging container;

Figure 3 is a plan view showing the entire cutting blade of the packaging material supply device shown in Figure 1;

Figure 4 is a plan view showing, in an enlarged manner, the teeth of the first central portion of the cutting blade shown in Figure 3;

Figure 5 is a plan view showing, in an enlarged manner, the teeth of the second central portion of the cutting blade shown in Figure 3;

Figure 6 is a plan view showing, in an enlarged manner, the teeth of the third central portion of the cutting blade shown in Figure 3;

Figure 7 is a plan view showing, in an enlarged manner, the teeth of the end portion of the cutting blade shown in Figure 3;

Figure 8 is a plan view showing, in an enlarged manner, the teeth of the end portion of the cutting edge of the modified example of the present invention;

Figure 9 is a plan view showing, in an enlarged manner, the teeth of the end portion of the cutting edge of another modification of the present invention;

Fig. 10 is a plan view showing the entire cutting blade according to still another modification of the present invention.

20. . . Cutting edge

twenty one. . . Central part

21A. . . First central part

21B. . . Second central part

21C. . . Third central part

twenty two. . . End part

A. . . Central axis direction

CL. . . Center line

W20. . . Blade width

Wa. . . First central part width

Wb. . . 2nd central part width

Wc. . . 3rd central part width

We. . . End portion width

θ. . . Inner angle

Claims (7)

A cutting blade which is attached to a packaging container for accommodating a roll-shaped packaging material for cutting a packaging material, the cutting edge being parallel to a central axis of the roll-shaped packaging material Extending in the direction, the packaging material is cut by the cutting edge in a direction parallel to the central axis, the cutting edge comprising: a central portion including a center of the cutting edge in a direction parallel to the central axis a plurality of tooth tips arranged in a V shape for the apex; and end portions disposed on both sides of the central portion; and each end portion includes a plurality of tooth tips arranged in a straight line; the arrangement of the tooth tips of the end portions And extending corresponding to one of the two ends of the arrangement of the tooth tips of the central portion to form an angle, wherein each of the tooth tips of the end portion is included in a corresponding one of the plurality of teeth disposed at the end portion, and a direction parallel to the central axis and one of a plurality of roots corresponding to an intermediate position between adjacent roots, or a direction parallel to the central axis from the intermediate position to the outer side Each of the teeth of the end portion has a pair of oblique sides recessed toward the inner side of the tooth; a radius of curvature of the oblique side of the inner side of each of the teeth of the end portion is larger than a radius of curvature of the oblique side of the outer side of the same tooth. The cutting blade for a packaging container according to claim 1, wherein the central portion includes a plurality of first central teeth and a plurality of second central teeth smaller than the first central teeth, and the first central teeth are adjacent to each other First central tooth The interval between the first central teeth is located at one of the central points, and the second central tooth is located at one of the first central teeth. A line connecting the tooth tips of the adjacent first center teeth in a straight line between the center teeth is located at a position apart from the second center tooth. A cutting edge according to claim 1 or 2, wherein each end portion has a flat portion provided between adjacent teeth in a direction parallel to said central axis. The cutting edge of claim 1 or 2, wherein the more the tooth tip of the cutting edge is located away from the apex, the more the corresponding one of the pair of adjacent roots is between the center and the center The direction in which the axes are parallel is located on the outer side. The cutting edge of claim 1 or 2, wherein the cutting edge is made of a non-metal. A packaging container comprising a packaging material wound into a roll shape, and comprising a cutting edge according to claim 1 or 2 for cutting the packaging material. A packaging material supply device comprising: the packaging container of claim 6; and a packaging material wound into a roll in the packaging container.