JP2012082003A - Cutting blade for packaging container and packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting blade for a packaging container excellent in cutting properties even in a state that there is no burr, and high in safety to an user.SOLUTION: The cutting blade 30 for the packaging container is attached to the packaging container 100 housing a roll 5 formed by winding a packaging material 1, includes a plurality of teeth arranged in nearly V-shapes along an axial direction X of the roll, and cuts the packaging material pulled out from the roll. The cutting blade for the packaging container has: a tip Wa including a nearly V-shaped top point T; and a pair of intermediate parts Wb connected to both ends of the tip. Teeth arranged in the tip have: a center tooth 31 positioned in the center of the tip; large teeth 32; and small teeth 34 having tooth heights lower than those of the large teeth. Tooth tips 35a of teeth 35 arranged in the intermediate parts are positioned on a nearly V-shaped imaginary line La1, and tooth tips 31a, 32a and 34a of the teeth arranged on the tip are positioned on an extended line La2 of the imaginary line La1 or at tooth bottom sides of the respective teeth from the extended line.

Description

  The present invention relates to a cutting blade for a packaging container that accommodates a package such as a wrap film or an aluminum foil.

  A packaging container that accommodates a package such as a wrap film or an aluminum foil usually includes a container body that accommodates a roll obtained by winding the package around a cylindrical paper tube, and a lid that is provided integrally with the container body. The cutting blade is provided at the lower end of the lid, and has a plurality of teeth arranged over the entire width of the lid along the axial direction of the roll. The user opens the lid, pulls out the package from the container for a predetermined length, closes the lid, presses the lid front plate with the thumb of one hand, and fixes the package. The package is cut by pulling the pulled-out package with the other hand. Such a cutting blade for a packaging container is desired to be able to cut a package with a smaller force.

  The present applicant forms a V-shape with the central portion of the cutting blade roll in the axial direction closest to the bottom of the packaging container, and the tooth tip located at the top of the V-shape first comes into contact with the package for packaging. The packaging container which can make small force required to cut | disconnect a package by cutting a thing toward the both ends from the center of an axial direction is proposed (for example, refer patent document 1).

  Conventionally, metal is used as the material of the cutting blade because it is excellent in cutting performance and durability. The present applicant has found that the protrusions (burrs) at the end produced by punching during the production of a metal cutting blade influence the cutability of the package, and the height of the burr is controlled within a predetermined range. Thus, a packaging container with improved cutting performance has been proposed (see, for example, Patent Document 2).

  Furthermore, the cutting blade for packaging containers is desired to have safety for the user. The present applicant has proposed a non-metal cutting blade made of paper, plastic or the like in place of the metal cutting blade in consideration of safety for the user (see, for example, Patent Document 3). . Since non-metallic cutting blades do not generate burrs, it is difficult to obtain good cutting properties as compared to metal cutting blades. Therefore, in the cutting blade described in Patent Document 3, a plurality of first teeth having higher tooth heights than other regions are arranged in the region near the V-shaped apex and the region near both ends, By inserting the first tooth into the package prior to the other teeth, the force required at the beginning of cutting can be reduced. In addition, in a non-metallic cutting blade, abrasive grains are fixed to at least the upper end surface of the teeth forming the cutting blade via a resin, and the coated particles play a role similar to burrs and break the package. And a technique for imparting excellent cutting properties is disclosed (for example, see Patent Document 4).

JP-A-2-45349 JP 2002-362547 A JP 2009-132405 A JP-A-7-309335

  In patent document 3, from the consideration of the safety for the user, the cutting blade is limited to being made of a non-metal, and the shape is designed. However, in terms of durability, cutting performance and cost, the cutting is made of metal. There is a demand for blades. Therefore, there is a need for a cutting blade that has a highly safe shape and can cut a package with a small force, regardless of the material, even if it is made of metal.

  The piercing of the teeth into the package can be performed with a smaller force as the number of teeth pierced at the same time is smaller. However, in the cutting blade that cuts the package from the apex of the V shape including Patent Document 1, a tear of the package is formed in the direction in which the package is pulled out with respect to the teeth located at the apex of the V shape, The package may not be cut in a direction parallel to the axial direction of the roll.

  In the method of controlling the height of burrs, such as Patent Document 2, to improve the cutting performance, it is difficult to manage the generation of burrs suitable for cutting packages due to wear or sag of the mold. was there.

  With a cutting blade provided with abrasive grains such as Patent Document 4, it is difficult to control the arrangement of the abrasive grains, and a desired cutting property may not be obtained. In addition, there is a problem that the structure and the manufacturing process become complicated. Furthermore, there is a possibility that the abrasive grains fall off. As described above, a conventional cutting blade for a packaging container has not yet achieved sufficient safety and cutting performance.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a cutting blade for a packaging container that has excellent cutting properties even in the absence of burrs and has high safety for the user.

  A cutting blade for a packaging container according to the present invention is provided with a plurality of teeth that are attached to a packaging container that accommodates a roll wound with a package and arranged in a substantially V shape along the axial direction of the roll, In a cutting blade for a packaging container that cuts a package drawn from a roll, the cutting blade includes a tip section including a substantially V-shaped apex, and a pair of center sections connected to both ends of the tip section. The teeth arranged in the tip section have a center tooth located at the center of the tip section, a large tooth, and a small tooth having a tooth height smaller than the tooth height of the large tooth, and the center section The tooth tips arranged on the imaginary line are on a substantially V-shaped imaginary line, and the tooth tips arranged on the tip section are on the extension line of the imaginary line or on the root side of each tooth than the extension line It is characterized by that.

  In the cutting blade for a packaging container according to the present invention, it is preferable that the depth of the root of the central tooth is deeper than an extended line of a reference line connecting the roots of the teeth arranged in the central section. The tip angles of the adjacent teeth sandwiching the central tooth become sharper, and the package can be cut with a smaller force at the initial stage of cutting.

  In the cutting blade for a packaging container according to the present invention, the interval between the tooth tip of the central tooth and the tooth tip adjacent to the central tooth is larger than the interval between the tooth tips of other adjacent teeth. Is preferred. The tooth bottom of both adjacent teeth sandwiching the central tooth can be made wider, and the physical strength of both adjacent teeth sandwiching the central tooth can be increased.

  In the cutting blade for packaging containers according to the present invention, it is preferable that the width of the tip section is 10 to 60 mm. Since the package can be made sufficiently brittle in the tip section and can be easily cut, the package can be smoothly pierced and torn in the subsequent center section with a small force.

  The cutting blade for packaging containers according to the present invention includes a form made of metal. A cutting blade with excellent cutting performance can be obtained without performing burr management.

  In the cutting blade for a packaging container according to the present invention, both sides of the central tooth are the large teeth, and the central large teeth that connect the large tooth tips that sandwich the central teeth. It is preferable to be at the root side of the tooth tip line. Since the two large teeth sandwiching the central tooth are pierced into the package in advance, the force required at the beginning of cutting can be further reduced. Moreover, it can suppress that the tear of a package is formed in the direction where a package is pulled out.

  The packaging container which concerns on this invention is equipped with the cutting blade for packaging containers which concerns on this invention, It is characterized by the above-mentioned.

  INDUSTRIAL APPLICABILITY The present invention can provide a cutting blade for a packaging container that has excellent cutting properties even in the absence of burrs and has high safety for the user.

It is a perspective view which shows an example of the packaging container which concerns on this embodiment. It is the elements on larger scale which show the 1st form of the front-end | tip part division and center part division of the cutting blade for packaging containers which concerns on this embodiment. FIG. 3 is a partially enlarged front view of a portion surrounded by a dotted line in FIG. 2. It is a partial expanded front view which shows the 2nd form of the front-end | tip part division and center part division of the cutting blade for packaging containers which concerns on this embodiment. It is the schematic which shows the 3rd form of the front-end | tip part division and center part division of the cutting blade for packaging containers which concerns on this embodiment, (a) is a partial expanded front view of a V-shaped cutting blade, (b) It is the elements on larger scale of the part enclosed with the broken line of (a). It is a partial expanded front view which shows the 4th form of the front-end | tip part division and center part division of the cutting blade for packaging containers which concerns on this embodiment.

  Next, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.

  FIG. 1 is a perspective view showing an example of a packaging container according to the present embodiment. FIG. 2 is a partially enlarged front view showing a first form of a tip section and a center section of a cutting blade for a packaging container according to the present invention. The cutting blade 30 for packaging containers according to the present embodiment is attached to the packaging container 100 that houses the roll 5 around which the package 1 is wound, and is arranged in a substantially V shape along the axial direction X of the roll 5. In the cutting blade for a packaging container that includes the teeth 31, 32, 34, 35, and cuts the package 1 drawn out from the roll 5, the tip section Wa including the substantially V-shaped apex T and the tip section Wa The teeth 31, 32, 34 having a pair of central section Wb connected to both ends and arranged in the tip section Wa are center teeth 31, large teeth 32, and large teeth positioned at the center of the tip section Wa. The tooth tips 35a of the teeth 35 arranged in the central section Wb are on a substantially V-shaped imaginary line La1, and the tip section has a small tooth 34 having a tooth height smaller than the tooth height of the tooth 32. The tooth tips 31a, 32a, 34a of the teeth 31, 32, 34 arranged in Wa are imaginary lines. Than the extension line La2 above or extension La2 of a1 in the tooth bottom 35b side of each tooth 31, 32, 34.

  In FIG. 1, a packaging container 100 includes a main body front plate 12 and a main body rear plate 13 erected on a long side of a rectangular main body bottom plate 11, a main body left side plate 14 erected on a short side of a rectangular main body bottom plate 11, and A container main body 10 having a main body right side plate 15 and containing a roll 5 in which the package 1 is wound in a roll shape, is connected to the upper end side of the main body rear surface plate 13 and a container main body 10 having an open upper surface so as to be rotatable. When the upper surface opening of the main body 10 is closed, the lid is connected to the top plate 21 and the top plate 21 covering the upper opening, and is overlapped on the outer side of the main body front plate 12 and overlaps the outer side of the main body left side plate 14. A lid body 20 having a lid left side plate 24 and a lid right side plate 25 placed on the outside of the main body right side plate 15.

  The packaging container 100 is formed of a plate material such as cardboard or plastic. Although the thickness of a board | plate material is not specifically limited, Generally it is 0.45-0.70 mm.

  The package 1 is, for example, a wrap film, an aluminum foil, and a paper sheet for cooking. The wrap film is, for example, a polyvinylidene chloride film, a polyvinyl chloride film, a polyethylene film, a polypropylene film, a polymethylpentene film, a polyester film, or an ethylene vinyl acetate copolymer film. The paper sheet for cooking is a sheet obtained by applying silicon resin processing or fluororesin processing to one or both sides of a paper base material. Although the thickness of the package 1 is not specifically limited, In the case of a wrap film, it is generally 5-20 micrometers.

  The cutting blade 30 has a substantially V-shaped cutting edge 30 a for cutting the package 1. The tip of the cutting edge 30a is formed in a sawtooth shape by arranging a plurality of teeth 31, 32, 34, and 35. In the cutting blade 30, a plurality of teeth 31, 32, 34, and 35 are arranged along the axial direction X of the roll 5, and the plurality of teeth 31, 32, 34, and 35 are the lower end side 22 a of the lid front plate 22. It is being fixed to the back surface (surface by the side of the container main body 10) of the lid | cover front plate 22 so that it may protrude from.

  The cutting blade 30 includes, based on the shape of teeth arranged, a tip section Wa including a substantially V-shaped apex T, a pair of center sections Wb connected to both ends of the tip section Wa, and both ends of a substantially V-shape. And a pair of both end sections Wc. The cutting blade 30 is preferably formed on the lid front plate 22 in line symmetry with a straight line C (hereinafter referred to as a center line) C passing through the center in the axial direction X of the roll 5 as an axis of symmetry.

  The central section Wb has a plurality of teeth 35. The shape and arrangement order of the teeth 35 arranged in the central section Wb are not particularly limited. For example, as shown in FIG. 2, a form in which all are the same shape, a form in which “large teeth” and “small teeth” with different tooth heights are arranged, such as the tip section Wa, and the interval between adjacent teeth is changed. There is a form in which the teeth are arranged such that the tooth tip direction is directed toward the center in the axial direction, and a tooth is arranged in which the tooth tip direction is directed toward both ends in the axial direction. In this specification, “tooth tip” refers to the tip (vertex) of each tooth, and “tooth bottom” refers to a trough formed by a pair of oblique sides extending on both sides of the vertex (tooth tip). The tooth height refers to the shortest distance between the reference line Lb1 connecting the tooth bottoms of the teeth arranged in the central section Wb or the extended line Lb2 of the reference line Lb1 and the tooth tip of each tooth.

  The virtual line La1 is a line obtained by connecting the tooth tips 35a of the teeth 35 arranged in the central section Wb. The virtual line La1 is a line that connects the tooth tips of the teeth having the highest tooth height when the teeth 35 arranged in the central section Wb have teeth having different tooth heights. The reference line Lb1 is a line obtained by connecting the roots 35b of the teeth 35 arranged in the central section Wb. The virtual line La1 and the reference line Lb1 are not limited to the form that is a straight line as shown in FIG. When the imaginary line La1 and the reference line Lb1 are curves, the extended lines La2 and Lb2 are lines that are extended while maintaining the same curvature. The imaginary line La1 and the lower end side 22a of the lid front plate 22 are preferably formed to be equidistant. Thereby, the physical strength and durability of the cutting blade 30 can be improved. Furthermore, safety can be improved. Moreover, it is preferable that the space | interval of virtual line La1 and reference line Lb1 is equidistant. Thereby, the durability of the plurality of teeth 31, 32, 34, 35 can be made uniform over the entire cutting blade.

  Both end sections Wc are sections positioned at both ends of the cutting blade 30 and have a plurality of teeth. In FIG. 1, both end sections Wc do not have a boundary with the central section Wb, and have the same tooth arrangement as the central section Wb. Therefore, it becomes the same as extending the center section Wb to both ends of the V-shape. The present embodiment is not limited to this form. For example, the lower end side 22a of the lid front plate 22 in the form in which the tooth tips are directed to both ends so that the package 1 can be cut from both ends, both end sections Wc. Can be made parallel to the bottom side 12a of the main body front plate 12, and a plurality of teeth provided on both end sections Wc can also be arranged in parallel to the bottom side 12a of the main body front plate 12.

  The tip end section Wa is a section including a substantially V-shaped apex T, and the center tooth 31, the large tooth 32, and the tooth height smaller than the tooth height of the large tooth 32 are located at the center of the tip end section Wa. Teeth 34. In FIG. 2, one central tooth 31, four large teeth 32, and four small teeth 34 having a tooth height smaller than the tooth height of the large teeth 32 are arranged. The large teeth 32 and the small teeth 34 are preferably arranged symmetrically with the central tooth 31 in between. The substantially V shape refers to a shape drawn by a pair of imaginary lines La1 extending from a pair of central section Wb and an extension line La2, and the center portion projects toward the bottom 12a side of the main body front plate 12 rather than the other portions. is there. A substantially V-shaped apex T indicates a portion where the extension line La2 of the pair of virtual lines La1 intersects in the tip end section Wa, and is the portion closest to the bottom side 12a of the main body front plate 12. The substantially V-shaped apex T is preferably on the center line C.

  In the cutting blade 30 for packaging containers which concerns on this embodiment, it is preferable that the width | variety A of the front-end | tip part division Wa is 10-60 mm. More preferably, it is a section of 20 to 40 mm. By making it within this range, the package 1 can be made sufficiently brittle and can be easily cut, so that the subsequent piercing and tearing of the package 1 in the central section Wb can be performed smoothly with a small force. Can do. Further, it is particularly preferable that the tip end section Wa has the tooth tip 31a of the center tooth 31 as the center in the axial direction X.

  The tooth tips 31a, 32a, 34a of the teeth 31, 32, 34 arranged in the distal end section Wa are on the extension line La2 of the virtual line La1 or on the tooth bottom side of each tooth 31, 32, 34 with respect to the extension line La2. . Specifically, as shown in FIG. 2, the tip 32a of the large tooth 32 is on the extension line La2 of the imaginary line La1, and the tip 31a, 34a of the center tooth 31 and the small tooth 34 is more than the extension line La2. The form on the tooth bottom side of the teeth 31, 34, or the tooth tips 31 a, 32 a, 34 a of the central tooth 31, the large tooth 32, and the small tooth 34 are on the tooth bottom side of each tooth 31, 32, 34 than the extension line La 2. This is a form. Thereby, since the tooth tips 31a, 32a, 34a of all the teeth 31, 32, 34 teeth do not protrude from the extension line La2 of the virtual line La1, safety for the user can be ensured.

  FIG. 3 is a partially enlarged front view of a portion surrounded by a dotted line in FIG. As shown in FIG. 3, in the cutting blade 30 for a packaging container according to this embodiment, both sides of the center tooth 31 are large teeth 32, and the tooth tips 31 a of the center tooth 31 are both sides of the center tooth 31. It is preferable that it is on the root side of the center large tooth tip line Lc connecting the tooth tips 33a of the large teeth 32 (hereinafter, the other large teeth 32 are distinguished and referred to as the central large teeth 33). More preferably, the tooth tip 31a of the central tooth 31 is preferably located between the central large tooth tip line Lc and the small tooth tip line Ld connecting the tooth tip 34a of the small tooth 34. Particularly preferably, the tooth tip 31a of the central tooth 31 is on the small tooth tip line Ld.

  The force for inserting the tip of each tooth into the package 1 increases as the number of teeth inserted at a time increases, and decreases as the number decreases. Therefore, both sides of the central tooth 31 are the central large teeth 33, and the tooth tip 31a of the central tooth 31 is located on the tooth bottom side of the central large tooth tip line Lc connecting the tooth tips 33a of the central large tooth 33. In the initial stage of cutting, the two large central teeth 33 are first inserted into the package 1, so that the force required in the initial stage of cutting can be further reduced. Furthermore, in the configuration in which only the tooth tip 31a of the central tooth 31 protrudes beyond the tooth tips of the other teeth, an unintentional direction extending in the direction in which the package 1 is pulled out from the central tooth 31 (β direction in FIG. 1). For the packaging container according to the present embodiment, there is a case where a tear of the package 1 is formed and the package 1 cannot be cut in a direction parallel to the axial direction of the roll (X direction in FIG. 1). In the cutting blade 30, the tip 33a of the two central large teeth 33 contacts the package 1 in advance of the tip 31a of the central tooth 31, so that the force acting on the package 1 is dispersed, The package 1 can be cut in a direction parallel to the axial direction of the roll (the X direction in FIG. 1) by suppressing the formation of the aforementioned tear in the undesired direction.

  In this embodiment, as shown in FIG.2 and FIG.3, it is preferable to arrange the large teeth 32 and the small teeth 34 alternately. By arranging in this way, the number of tooth tips 32a of the large teeth 32 inserted at a time can be reduced, and cutting can be performed with a smaller force.

  The ratio (h2 / h1) between the tooth height h2 of the small teeth 34 and the tooth height h1 of the large teeth 32 is preferably 2/10 to 8/10. More preferably, it is 4/10 to 6/10. If the ratio (h2 / h1) between the tooth height h2 of the small teeth 34 and the tooth height h1 of the large teeth 32 is less than 2/10, the package 1 is inserted into the vicinity of the bottom of the large teeth 32 and then the small teeth 34 The tooth tip 34 a comes into contact with the package 1, and a large force may be required to cut the package 1. Further, when the ratio (h2 / h1) between the tooth height h2 of the small teeth 34 and the tooth height h1 of the large teeth 32 exceeds 8/10, the small teeth before the large teeth 32 are sufficiently inserted into the package 1. 34 tooth tips 34a come into contact with the package 1, and the resistance force received by the user when the package 1 is cut may increase.

  The plurality of teeth 31, 32, 33, 34, and 35 that constitute the cutting blade all have tooth tips 31 a, 32 a, 33 a, 34 a, and 35 a as apexes, and extend from the apexes and the tooth bases on both sides from the apexes. The pair of hypotenuses forms a substantially triangular shape. The pair of hypotenuses are linear or arcuate indented into the teeth. In FIG. 3, angles θ1, θ2, θ3, θ4 (not shown), and θ5 (not shown) formed by a pair of hypotenuses or tangents of a pair of hypotenuses are referred to as tooth tip angles. The tooth tip angle θ1 of the central tooth 31 and the tooth tip angle θ3 of the small teeth 34 are preferably 30 ° to 120 °. More preferably, it is 45 ° -80 °. If the tooth tip angle θ1 of the central tooth 31 and the tooth tip angle θ3 of the small tooth 34 are less than 30 °, the physical strength of the central tooth 31 and the small tooth 34 may be insufficient and the durability may be poor. When the tip angle θ1 of the central tooth 31 and the tip angle θ3 of the small teeth 34 exceed 120 °, a large force may be required for piercing the package 1.

  The tip angle θ2 of the central large tooth 33 and the tip angle θ4 (not shown) of the large tooth 32 are preferably 30 ° to 90 °. More preferably, it is 45 ° to 70 °. When the tip angle θ2 of the central large tooth 33 and the tip angle θ4 (not shown) of the large tooth 32 are less than 30 °, the physical strength of the central large tooth 33 and the large tooth 32 is insufficient and the durability is poor. There is. Moreover, safety may be inferior. If the tooth tip angle θ2 of the central large tooth 33 and the tooth tip angle θ4 (not shown) of the large tooth 32 exceed 90 °, a large force may be required to pierce the package 1.

  Although not shown in FIG. 3, the tooth tip angle θ5 (not shown) of the teeth 35 arranged in the central section Wb is preferably 30 ° to 90 °. More preferably, it is 45 ° to 70 °. If the tip angle θ5 of the teeth 35 arranged in the central section Wb is less than 30 °, the physical strength of the teeth 35 may be insufficient and the durability may be inferior. Moreover, safety may be inferior. If the tip angle θ5 of the teeth 35 arranged in the central section Wb exceeds 90 °, a large force may be required to cut the package 1.

  Next, the case where the package 1 is cut | disconnected is demonstrated using FIG.1 and FIG.2.

  The operation at the time of cutting will be described with reference to FIG. The user first opens the lid 20, draws the package 1 from the roll 5 by a predetermined length, and then closes the lid 20. With one hand, the packaging container 100 is gripped, and the thumb of the gripped hand is applied to the lid front plate 22 and pressed toward the main body front plate 12. While pulling the package 1 pulled out with the other hand in the β direction, the packaging container 100 is twisted in the α direction with the hand holding the packaging container 100. By this operation, cutting of the package 1 is started. In this cutting method, the package 1 is sequentially opened from the V-shaped apex T toward both ends of the V-shape.

  The cutting of the package 1 will be described in more detail with reference to FIG. When the cutting operation is started, the tooth tips 33 a of the two central large teeth 33 come into contact with the package 1 and pierce the package 1. Subsequently, the tooth tip 31 a of the central tooth 31 comes into contact with the package 1, and the package 1 is cut by piercing the package 1. At the front end section Wa, as the packaging container 100 is twisted in the α direction in FIG. 1, the puncture of the package 1 with the large teeth 32 and the puncture and cutting of the package 1 with the small teeth 34 are performed in order, The package 1 is cut open from T to both ends of the V-shape. Before the package 1 is inserted into the bottom of the large tooth 32, the small teeth 34 cut the package 1, so that the tear propagation of the package 1 is performed smoothly, without giving the user a sense of resistance, The package 1 can be easily cut.

  When the packaging container 100 is further twisted in the α direction in FIG. 1, the teeth 35 arranged in the central section Wb sequentially contact each other to open the package 1, and the cutting of the package 1 is the package 1 in both end sections Wc. The cutting proceeds smoothly to both ends of the wire, and the cutting is completed. Since the package 1 is sufficiently weakened by cutting at the front end section Wa, the center section Wb and both end sections Wc can cut the package 1 with a small force by tear propagation.

  The material of the cutting blade 30 is not particularly limited, and examples thereof include metal, paper, vulcanized paper, resin-impregnated paper, and resin. The cutting blade 30 for packaging containers according to this embodiment includes a form made of metal. As described above, the cutting blade 30 for a packaging container according to this embodiment achieves both good cutting performance and safety by the arrangement of the teeth 31, 32, 33, 34, and 35 that form the cutting blade 30. Therefore, in the form made of metal, the management of burrs becomes unnecessary. Further, even when formed of a material that does not generate burrs other than metal, excellent cutting performance can be realized.

  FIG. 4 is a partially enlarged front view showing a second form of the tip section and the center section of the cutting blade for a packaging container according to the present embodiment. In the cutting blade 40 for packaging containers according to this embodiment, it is preferable that the depth of the root of the center tooth 41 is deeper than the extension line Lb2 of the reference line Lb1. As a result, the tooth tip angle θ1 of the central tooth 41 and the tooth tip angle θ2 of the central large tooth 43 become sharper and easy to puncture the package 1. Moreover, the length from the tooth tip 43a of the central large tooth 43 to the tooth bottom becomes long, and the package 1 can be cut efficiently. Therefore, the package 1 can be easily stabbed at the initial stage of cutting, and the cutting can be performed efficiently, and the tear is propagated by using the formed scratch as a trigger. Can be cut.

  FIG. 5 is a schematic view showing a third embodiment of the tip section and the center section of the cutting blade for a packaging container according to the present embodiment, (a) is a partially enlarged front view of a V-shaped cutting blade, (B) is the elements on larger scale of the part enclosed with the broken line of (a). In the cutting blade 50 for a packaging container according to the present embodiment, the interval W1 between the tooth tip 51a of the central tooth 51 and the tooth tip 53a of the tooth 53 adjacent to the central tooth 51 is the tooth tip between other adjacent teeth. It is preferable that the intervals W2, W3, and W4 be larger. Since the central large teeth 53 are wide, the physical strength of the central large teeth 53 can be increased, and the durability of the cutting blade 50 can be improved. Further, the length of the hypotenuse extending from the tooth tip 53a of the central large tooth 53 toward the tooth bottom is increased, and the package 1 can be efficiently cut.

  The distances W2, W3, and W4 between the other adjacent teeth are the distance W2 between the central large teeth 53 and the small teeth 54 adjacent to the central large teeth 53, and the large teeth 52 arranged in the tip section Wa. The interval W3 between the addendum 52a and the addendum 54a of the small teeth 54 and the interval W4 of the addendum 55a between adjacent teeth 55 arranged in the central section Wb. The intervals W1, W2, W3 of the tooth tips 51a, 52a, 53a, 54a of the teeth 51, 52, 53, 54 arranged in the distal end section Wa are the intervals W4 of the tooth tips 55a of the teeth 55 arranged in the central section Wb. Is preferably larger. As a result, the number of teeth arranged in the tip section Wa can be reduced, and the force required at the initial stage of cutting can be further reduced. Moreover, the physical strength of the teeth arranged in the tip section Wa can be increased, and the durability of the cutting blade 50 can be improved.

  FIG. 6 is a partially enlarged front view showing a fourth form of the tip section and the center section of the cutting blade for a packaging container according to the present embodiment. In the cutting blade 60 for packaging according to the present embodiment, the depth of the root of the central tooth 61 is made deeper than the extension line Lb2 of the reference line Lb1, and the tooth tip 61a and the central large tooth 63 of the central tooth 61 are used. It is preferable to make the space | interval with the tooth | gear tip 63a larger than the space | interval of the tooth | gear tip of other adjacent teeth. Thus, the durability of the central large teeth 63 can be improved while maintaining the length from the tooth tips 63a of the central large teeth 63 to the roots and efficiently cutting the package 1.

  The packaging container which concerns on this embodiment is provided with the cutting blade for packaging containers which concerns on this embodiment. The cutting blade for a packaging container according to the present embodiment has a good cutting property even in a state where there is no burr due to the arrangement of teeth forming the cutting blade, and there is no portion in which the tooth tip protrudes greatly. Therefore, the user can easily and safely cut the package with a small force by using the packaging container according to the present embodiment.

  In the first embodiment to the fourth embodiment, the teeth arranged in the tip section Wa are large teeth 32, 42, 52, 62 and small teeth 34, 44, 54, 64, “large teeth”, “small teeth”, Although they are alternately arranged as “large teeth” (see FIGS. 2 and 4 to 6), the present invention is not limited to this arrangement. As a modification, for example, two small teeth are arranged between adjacent large teeth such as “large teeth”, “small teeth”, “small teeth”, “large teeth”,. . Further, a configuration in which “medium teeth” having a tooth height intermediate between the large teeth 32, 42, 52, 62 and the small teeth 34, 44, 54, 64 is arranged between the “large teeth” and the “small teeth”. It is.

  In the first to fourth embodiments, the cutting blades 30, 40, 50, 60 are formed in line symmetry with the center line C as the axis of symmetry. However, the present invention is not limited to this, and the center line C Can be formed asymmetrically.

  In the packaging container 100 of FIG. 1, the cutting blade 30 includes a plurality of teeth arranged in a V shape having a substantially V-shaped apex T on the center line C. However, the present invention is not limited thereto. A plurality of teeth can be arranged by shifting the vertex T of the character to the right or left with respect to the center line C.

  According to the present invention, the cutting blade for a packaging container according to the present invention has a good cutting property even in the absence of burrs, and a portion in which the tooth tip protrudes larger than the tooth tip of other teeth Because it is a shape that takes into account safety for users, for example, wrap films used as packaging containers for foods, aluminum foil, paper sheets, or wrap films used as packing materials such as load collapse prevention Suitable as a packaging container.

DESCRIPTION OF SYMBOLS 1 Package 5 Roll 10 Container main body 11 Main body bottom plate 12 Main body front plate 12a Bottom side of main body front plate 13 Main body rear surface plate 14 Main body left side plate 15 Main body right side plate 20 Lid 21 Top surface plate 22 Lid front plate 22a Lower end of lid front plate Side 24 Lid left side plate 25 Lid right side plate 30, 40, 50, 60 Cutting blade 30a Cutting sides 31, 41, 51, 61 Central teeth 31a, 41a, 51a, 61a Central tooth tips 32, 42, 52, 62 Large Teeth 32a, 42a, 52a, 62a Large tooth tips 33, 43, 53, 63 Central large teeth 33a, 43a, 53a, 63a Central large teeth tooth tips 34, 44, 54, 64 Small teeth 34a, 44a, 54a , 64a Teeth 35a, 45a, 55a, 65a arranged in the central section of the small teeth 35, 45, 55, 65 Teeth 35b arranged in the central section of the teeth 35b, arranged in the central section of the teeth Tooth base 100 Packaging container T Apex W of substantially V shape Tip section Wb Center section Wc Both ends section C Center line La1 Virtual line La2 Virtual line extension line Lb1 Reference line Lb2 Reference line extension line Lc Central large tooth Tooth tip line Ld Small tooth tip line

  The present invention relates to a cutting blade for a packaging container that accommodates a package such as a wrap film or an aluminum foil.

  A packaging container that accommodates a package such as a wrap film or an aluminum foil usually includes a container body that accommodates a roll obtained by winding the package around a cylindrical paper tube, and a lid that is provided integrally with the container body. The cutting blade is provided at the lower end of the lid, and has a plurality of teeth arranged over the entire width of the lid along the axial direction of the roll. The user opens the lid, pulls out the package from the container for a predetermined length, closes the lid, presses the lid front plate with the thumb of one hand, and fixes the package. The package is cut by pulling the pulled-out package with the other hand. Such a cutting blade for a packaging container is desired to be able to cut a package with a smaller force.

  The present applicant forms a V-shape with the central portion of the cutting blade roll in the axial direction closest to the bottom of the packaging container, and the tooth tip located at the top of the V-shape first comes into contact with the package for packaging. The packaging container which can make small force required to cut | disconnect a package by cutting a thing toward the both ends from the center of an axial direction is proposed (for example, refer patent document 1).

  Conventionally, metal is used as the material of the cutting blade because it is excellent in cutting performance and durability. The present applicant has found that the protrusions (burrs) at the end produced by punching during the production of a metal cutting blade influence the cutability of the package, and the height of the burr is controlled within a predetermined range. Thus, a packaging container with improved cutting performance has been proposed (see, for example, Patent Document 2).

  Furthermore, the cutting blade for packaging containers is desired to have safety for the user. The present applicant has proposed a non-metal cutting blade made of paper, plastic or the like in place of the metal cutting blade in consideration of safety for the user (see, for example, Patent Document 3). . Since non-metallic cutting blades do not generate burrs, it is difficult to obtain good cutting properties as compared to metal cutting blades. Therefore, in the cutting blade described in Patent Document 3, a plurality of first teeth having higher tooth heights than other regions are arranged in the region near the V-shaped apex and the region near both ends, By inserting the first tooth into the package prior to the other teeth, the force required at the beginning of cutting can be reduced. In addition, in a non-metallic cutting blade, abrasive grains are fixed to at least the upper end surface of the teeth forming the cutting blade via a resin, and the coated particles play a role similar to burrs and break the package. And a technique for imparting excellent cutting properties is disclosed (for example, see Patent Document 4).

JP-A-2-45349 JP 2002-362547 A JP 2009-132405 A JP-A-7-309335

  In patent document 3, from the consideration of the safety for the user, the cutting blade is limited to being made of a non-metal, and the shape is designed. However, in terms of durability, cutting performance and cost, the cutting is made of metal. There is a demand for blades. Therefore, there is a need for a cutting blade that has a highly safe shape and can cut a package with a small force, regardless of the material, even if it is made of metal.

  The piercing of the teeth into the package can be performed with a smaller force as the number of teeth pierced at the same time is smaller. However, in the cutting blade that cuts the package from the apex of the V shape including Patent Document 1, a tear of the package is formed in the direction in which the package is pulled out with respect to the teeth located at the apex of the V shape, The package may not be cut in a direction parallel to the axial direction of the roll.

  In the method of controlling the height of burrs, such as Patent Document 2, to improve the cutting performance, it is difficult to manage the generation of burrs suitable for cutting packages due to wear or sag of the mold. was there.

  With a cutting blade provided with abrasive grains such as Patent Document 4, it is difficult to control the arrangement of the abrasive grains, and a desired cutting property may not be obtained. In addition, there is a problem that the structure and the manufacturing process become complicated. Furthermore, there is a possibility that the abrasive grains fall off. As described above, a conventional cutting blade for a packaging container has not yet achieved sufficient safety and cutting performance.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a cutting blade for a packaging container that has excellent cutting properties even in the absence of burrs and has high safety for the user.

A cutting blade for a packaging container according to the present invention is provided with a plurality of teeth that are attached to a packaging container that accommodates a roll wound with a package and arranged in a substantially V shape along the axial direction of the roll, In a cutting blade for a packaging container for cutting a package drawn from a roll, the cutting blade includes a tip section including a substantially V-shaped apex, and a pair of intermediate sections connected to both ends of the tip section. The teeth arranged in the tip section have a center tooth located at the center of the tip section, a large tooth, and a small tooth having a tooth height smaller than the tooth height of the large tooth, and the intermediate section The tooth tips arranged on the imaginary line are on a substantially V-shaped imaginary line, and the tooth tips arranged on the tip section are on the extension line of the imaginary line or on the root side of each tooth than the extension line It is characterized by that.

In the cutting blade for a packaging container according to the present invention, it is preferable that the depth of the root of the central tooth is deeper than an extended line of a reference line connecting the roots of the teeth arranged in the intermediate section . The tip angles of the adjacent teeth sandwiching the central tooth become sharper, and the package can be cut with a smaller force at the initial stage of cutting.

  In the cutting blade for a packaging container according to the present invention, the interval between the tooth tip of the central tooth and the tooth tip adjacent to the central tooth is larger than the interval between the tooth tips of other adjacent teeth. Is preferred. The tooth bottom of both adjacent teeth sandwiching the central tooth can be made wider, and the physical strength of both adjacent teeth sandwiching the central tooth can be increased.

In the cutting blade for packaging containers according to the present invention, it is preferable that the large teeth and the small teeth are alternately arranged. It is possible to reduce the number of teeth of large teeth that are inserted at a time, and it is possible to perform cutting with a smaller force.

In the cutting blade for packaging containers according to the present invention, it is preferable that the width of the tip section is 10 to 60 mm. Since the package can be made sufficiently brittle in the tip section and can be easily cut, it is possible to smoothly puncture and tear the package in the subsequent intermediate section with a small force.

  The cutting blade for packaging containers according to the present invention includes a form made of metal. A cutting blade with excellent cutting performance can be obtained without performing burr management.

  In the cutting blade for a packaging container according to the present invention, both sides of the central tooth are the large teeth, and the central large teeth that connect the large tooth tips that sandwich the central teeth. It is preferable to be at the root side of the tooth tip line. Since the two large teeth sandwiching the central tooth are pierced into the package in advance, the force required at the beginning of cutting can be further reduced. Moreover, it can suppress that the tear of a package is formed in the direction where a package is pulled out.

  The packaging container which concerns on this invention is equipped with the cutting blade for packaging containers which concerns on this invention, It is characterized by the above-mentioned.

  INDUSTRIAL APPLICABILITY The present invention can provide a cutting blade for a packaging container that has excellent cutting properties even in the absence of burrs and has high safety for the user.

It is a perspective view which shows an example of the packaging container which concerns on this embodiment. It is the elements on larger scale which show the 1st form of the front-end | tip part division and intermediate part division of the cutting blade for packaging containers which concerns on this embodiment. FIG. 3 is a partially enlarged front view of a portion surrounded by a dotted line in FIG. 2. It is a partial expanded front view which shows the 2nd form of the front-end | tip part division and intermediate part division of the cutting blade for packaging containers which concerns on this embodiment. It is the schematic which shows the 3rd form of the front-end | tip part division and intermediate | middle part division of the cutting blade for packaging containers which concerns on this embodiment, (a) is a partial expanded front view of a V-shaped cutting blade, (b) It is the elements on larger scale of the part enclosed with the broken line of (a). It is a partial expanded front view which shows the 4th form of the front-end | tip part division and intermediate part division of the cutting blade for packaging containers which concerns on this embodiment.

  Next, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.

FIG. 1 is a perspective view showing an example of a packaging container according to the present embodiment. FIG. 2 is a partially enlarged front view showing a first form of a tip section and an intermediate section of a cutting blade for a packaging container according to the present invention. The cutting blade 30 for packaging containers according to the present embodiment is attached to the packaging container 100 that houses the roll 5 around which the package 1 is wound, and is arranged in a substantially V shape along the axial direction X of the roll 5. In the cutting blade for a packaging container that includes the teeth 31, 32, 34, 35, and cuts the package 1 drawn out from the roll 5, the tip section Wa including the substantially V-shaped apex T and the tip section Wa The teeth 31, 32, 34 having a pair of intermediate sections Wb connected to both ends and arranged in the tip section Wa are center teeth 31, large teeth 32, and large teeth positioned at the center of the tip section Wa. The tooth tips 35a of the teeth 35 arranged in the intermediate section Wb are on the substantially V-shaped imaginary line La1, and the tip section is a small tooth 34 having a tooth height smaller than the tooth height of the tooth 32. The tooth tips 31a, 32a, 34a of the teeth 31, 32, 34 arranged in Wa are imaginary lines. Than the extension line La2 above or extension La2 of a1 in the tooth bottom 35b side of each tooth 31, 32, 34.

  In FIG. 1, a packaging container 100 includes a main body front plate 12 and a main body rear plate 13 erected on a long side of a rectangular main body bottom plate 11, a main body left side plate 14 erected on a short side of a rectangular main body bottom plate 11, and A container main body 10 having a main body right side plate 15 and containing a roll 5 in which the package 1 is wound in a roll shape, is connected to the upper end side of the main body rear surface plate 13 and a container main body 10 having an open upper surface so as to be rotatable. When the upper surface opening of the main body 10 is closed, the lid is connected to the top plate 21 and the top plate 21 covering the upper opening, and is overlapped on the outer side of the main body front plate 12 and overlaps the outer side of the main body left side plate 14. A lid body 20 having a lid left side plate 24 and a lid right side plate 25 placed on the outside of the main body right side plate 15.

  The packaging container 100 is formed of a plate material such as cardboard or plastic. Although the thickness of a board | plate material is not specifically limited, Generally it is 0.45-0.70 mm.

  The package 1 is, for example, a wrap film, an aluminum foil, and a paper sheet for cooking. The wrap film is, for example, a polyvinylidene chloride film, a polyvinyl chloride film, a polyethylene film, a polypropylene film, a polymethylpentene film, a polyester film, or an ethylene vinyl acetate copolymer film. The paper sheet for cooking is a sheet obtained by applying silicon resin processing or fluororesin processing to one or both sides of a paper base material. Although the thickness of the package 1 is not specifically limited, In the case of a wrap film, it is generally 5-20 micrometers.

  The cutting blade 30 has a substantially V-shaped cutting edge 30 a for cutting the package 1. The tip of the cutting edge 30a is formed in a sawtooth shape by arranging a plurality of teeth 31, 32, 34, and 35. In the cutting blade 30, a plurality of teeth 31, 32, 34, and 35 are arranged along the axial direction X of the roll 5, and the plurality of teeth 31, 32, 34, and 35 are the lower end side 22 a of the lid front plate 22. It is being fixed to the back surface (surface by the side of the container main body 10) of the lid | cover front plate 22 so that it may protrude from.

The cutting blade 30 includes, based on the shape of the teeth to be arranged, a tip section Wa including a substantially V-shaped apex T, a pair of intermediate section sections Wb connected to both ends of the tip section Wa, and both ends of a substantially V shape. And a pair of both end sections Wc. The cutting blade 30 is preferably formed on the lid front plate 22 in line symmetry with a straight line C (hereinafter referred to as a center line) C passing through the center in the axial direction X of the roll 5 as an axis of symmetry.

The intermediate section Wb has a plurality of teeth 35. The shape and arrangement order of the teeth 35 arranged in the intermediate section Wb are not particularly limited. For example, as shown in FIG. 2, a form in which all are the same shape, a form in which “large teeth” and “small teeth” with different tooth heights are arranged, such as the tip section Wa, and the interval between adjacent teeth is changed. There is a form in which the teeth are arranged such that the tooth tip direction is directed toward the center in the axial direction, and a tooth is arranged in which the tooth tip direction is directed toward both ends in the axial direction. In this specification, “tooth tip” refers to the tip (vertex) of each tooth, and “tooth bottom” refers to a trough formed by a pair of oblique sides extending on both sides of the vertex (tooth tip). The tooth height refers to the shortest distance between the reference line Lb1 connecting the tooth bottoms of the teeth arranged in the intermediate section Wb or the extended line Lb2 of the reference line Lb1 and the tooth tip of each tooth.

The virtual line La1 is a line obtained by connecting the tips 35a of the teeth 35 arranged in the intermediate section Wb. The virtual line La1 is a line that connects the tooth tips of the tooth having the highest tooth height when the teeth 35 arranged in the intermediate section Wb have teeth having different tooth heights. The reference line Lb1 is a line obtained by connecting the roots 35b of the teeth 35 arranged in the intermediate section Wb. The virtual line La1 and the reference line Lb1 are not limited to the form that is a straight line as shown in FIG. When the imaginary line La1 and the reference line Lb1 are curves, the extended lines La2 and Lb2 are lines that are extended while maintaining the same curvature. The imaginary line La1 and the lower end side 22a of the lid front plate 22 are preferably formed to be equidistant. Thereby, the physical strength and durability of the cutting blade 30 can be improved. Furthermore, safety can be improved. Moreover, it is preferable that the space | interval of virtual line La1 and reference line Lb1 is equidistant. Thereby, the durability of the plurality of teeth 31, 32, 34, 35 can be made uniform over the entire cutting blade.

Both end sections Wc are sections positioned at both ends of the cutting blade 30 and have a plurality of teeth. In Figure 1, both end portions compartment Wc is not an intermediate side section Wb and the boundary, and also the sequence of the intermediate side section Wb and teeth. Therefore, it is the same as extending the intermediate section Wb to both ends of the V shape. The present embodiment is not limited to this form. For example, the lower end side 22a of the lid front plate 22 in the form in which the tooth tips are directed to both ends so that the package 1 can be cut from both ends, both end sections Wc. Can be made parallel to the bottom side 12a of the main body front plate 12, and a plurality of teeth provided on both end sections Wc can also be arranged in parallel to the bottom side 12a of the main body front plate 12.

The tip end section Wa is a section including a substantially V-shaped apex T, and the center tooth 31, the large tooth 32, and the tooth height smaller than the tooth height of the large tooth 32 are located at the center of the tip end section Wa. Teeth 34. In FIG. 2, one central tooth 31, four large teeth 32, and four small teeth 34 having a tooth height smaller than the tooth height of the large teeth 32 are arranged. The large teeth 32 and the small teeth 34 are preferably arranged symmetrically with the central tooth 31 in between. The substantially V shape refers to a shape drawn by a pair of imaginary lines La1 extending from a pair of intermediate section Wb and an extension line La2 thereof, and a shape in which the central portion protrudes toward the bottom 12a side of the main body front plate 12 rather than other portions. is there. A substantially V-shaped apex T indicates a portion where the extension line La2 of the pair of virtual lines La1 intersects in the tip end section Wa, and is the portion closest to the bottom side 12a of the main body front plate 12. The substantially V-shaped apex T is preferably on the center line C.

In the cutting blade 30 for packaging containers which concerns on this embodiment, it is preferable that the width | variety A of the front-end | tip part division Wa is 10-60 mm. More preferably, it is a section of 20 to 40 mm. By making it within this range, the package 1 can be made sufficiently brittle and can be easily cut, so that the subsequent piercing and tearing of the package 1 in the intermediate section Wb can be performed smoothly with a small force. Can do. Further, it is particularly preferable that the tip end section Wa has the tooth tip 31a of the center tooth 31 as the center in the axial direction X.

  The tooth tips 31a, 32a, 34a of the teeth 31, 32, 34 arranged in the distal end section Wa are on the extension line La2 of the virtual line La1 or on the tooth bottom side of each tooth 31, 32, 34 with respect to the extension line La2. . Specifically, as shown in FIG. 2, the tip 32a of the large tooth 32 is on the extension line La2 of the imaginary line La1, and the tip 31a, 34a of the center tooth 31 and the small tooth 34 is more than the extension line La2. The form on the tooth bottom side of the teeth 31, 34, or the tooth tips 31 a, 32 a, 34 a of the central tooth 31, the large tooth 32, and the small tooth 34 are on the tooth bottom side of each tooth 31, 32, 34 than the extension line La 2. This is a form. Thereby, since the tooth tips 31a, 32a, 34a of all the teeth 31, 32, 34 teeth do not protrude from the extension line La2 of the virtual line La1, safety for the user can be ensured.

  FIG. 3 is a partially enlarged front view of a portion surrounded by a dotted line in FIG. As shown in FIG. 3, in the cutting blade 30 for a packaging container according to this embodiment, both sides of the center tooth 31 are large teeth 32, and the tooth tips 31 a of the center tooth 31 are both sides of the center tooth 31. It is preferable that it is on the root side of the center large tooth tip line Lc connecting the tooth tips 33a of the large teeth 32 (hereinafter, the other large teeth 32 are distinguished and referred to as the central large teeth 33). More preferably, the tooth tip 31a of the central tooth 31 is preferably located between the central large tooth tip line Lc and the small tooth tip line Ld connecting the tooth tip 34a of the small tooth 34. Particularly preferably, the tooth tip 31a of the central tooth 31 is on the small tooth tip line Ld.

  The force for inserting the tip of each tooth into the package 1 increases as the number of teeth inserted at a time increases, and decreases as the number decreases. Therefore, both sides of the central tooth 31 are the central large teeth 33, and the tooth tip 31a of the central tooth 31 is located on the tooth bottom side of the central large tooth tip line Lc connecting the tooth tips 33a of the central large tooth 33. In the initial stage of cutting, the two large central teeth 33 are first inserted into the package 1, so that the force required in the initial stage of cutting can be further reduced. Furthermore, in the configuration in which only the tooth tip 31a of the central tooth 31 protrudes beyond the tooth tips of the other teeth, an unintentional direction extending in the direction in which the package 1 is pulled out from the central tooth 31 (β direction in FIG. 1). For the packaging container according to the present embodiment, there is a case where a tear of the package 1 is formed and the package 1 cannot be cut in a direction parallel to the axial direction of the roll (X direction in FIG. 1). In the cutting blade 30, the tip 33a of the two central large teeth 33 contacts the package 1 in advance of the tip 31a of the central tooth 31, so that the force acting on the package 1 is dispersed, The package 1 can be cut in a direction parallel to the axial direction of the roll (the X direction in FIG. 1) by suppressing the formation of the aforementioned tear in the undesired direction.

  In this embodiment, as shown in FIG.2 and FIG.3, it is preferable to arrange the large teeth 32 and the small teeth 34 alternately. By arranging in this way, the number of tooth tips 32a of the large teeth 32 inserted at a time can be reduced, and cutting can be performed with a smaller force.

  The ratio (h2 / h1) between the tooth height h2 of the small teeth 34 and the tooth height h1 of the large teeth 32 is preferably 2/10 to 8/10. More preferably, it is 4/10 to 6/10. If the ratio (h2 / h1) between the tooth height h2 of the small teeth 34 and the tooth height h1 of the large teeth 32 is less than 2/10, the package 1 is inserted into the vicinity of the bottom of the large teeth 32 and then the small teeth 34 The tooth tip 34 a comes into contact with the package 1, and a large force may be required to cut the package 1. Further, when the ratio (h2 / h1) between the tooth height h2 of the small teeth 34 and the tooth height h1 of the large teeth 32 exceeds 8/10, the small teeth before the large teeth 32 are sufficiently inserted into the package 1. 34 tooth tips 34a come into contact with the package 1, and the resistance force received by the user when the package 1 is cut may increase.

  The plurality of teeth 31, 32, 33, 34, and 35 that constitute the cutting blade all have tooth tips 31 a, 32 a, 33 a, 34 a, and 35 a as apexes, and extend from the apexes and the tooth bases on both sides from the apexes. The pair of hypotenuses forms a substantially triangular shape. The pair of hypotenuses are linear or arcuate indented into the teeth. In FIG. 3, angles θ1, θ2, θ3, θ4 (not shown), and θ5 (not shown) formed by a pair of hypotenuses or tangents of a pair of hypotenuses are referred to as tooth tip angles. The tooth tip angle θ1 of the central tooth 31 and the tooth tip angle θ3 of the small teeth 34 are preferably 30 ° to 120 °. More preferably, it is 45 ° -80 °. If the tooth tip angle θ1 of the central tooth 31 and the tooth tip angle θ3 of the small tooth 34 are less than 30 °, the physical strength of the central tooth 31 and the small tooth 34 may be insufficient and the durability may be poor. When the tip angle θ1 of the central tooth 31 and the tip angle θ3 of the small teeth 34 exceed 120 °, a large force may be required for piercing the package 1.

  The tip angle θ2 of the central large tooth 33 and the tip angle θ4 (not shown) of the large tooth 32 are preferably 30 ° to 90 °. More preferably, it is 45 ° to 70 °. When the tip angle θ2 of the central large tooth 33 and the tip angle θ4 (not shown) of the large tooth 32 are less than 30 °, the physical strength of the central large tooth 33 and the large tooth 32 is insufficient and the durability is poor. There is. Moreover, safety may be inferior. If the tooth tip angle θ2 of the central large tooth 33 and the tooth tip angle θ4 (not shown) of the large tooth 32 exceed 90 °, a large force may be required to pierce the package 1.

Although not shown in FIG. 3, the tooth tip angle θ5 (not shown) of the teeth 35 arranged in the intermediate section Wb is preferably 30 ° to 90 °. More preferably, it is 45 ° to 70 °. If the tip angle θ5 of the teeth 35 arranged in the intermediate section Wb is less than 30 °, the physical strength of the teeth 35 may be insufficient and the durability may be poor. Moreover, safety may be inferior. When the tip angle θ5 of the teeth 35 arranged in the intermediate section Wb exceeds 90 °, a large force may be required for cutting the package 1.

  Next, the case where the package 1 is cut | disconnected is demonstrated using FIG.1 and FIG.2.

  The operation at the time of cutting will be described with reference to FIG. The user first opens the lid 20, draws the package 1 from the roll 5 by a predetermined length, and then closes the lid 20. With one hand, the packaging container 100 is gripped, and the thumb of the gripped hand is applied to the lid front plate 22 and pressed toward the main body front plate 12. While pulling the package 1 pulled out with the other hand in the β direction, the packaging container 100 is twisted in the α direction with the hand holding the packaging container 100. By this operation, cutting of the package 1 is started. In this cutting method, the package 1 is sequentially opened from the V-shaped apex T toward both ends of the V-shape.

  The cutting of the package 1 will be described in more detail with reference to FIG. When the cutting operation is started, the tooth tips 33 a of the two central large teeth 33 come into contact with the package 1 and pierce the package 1. Subsequently, the tooth tip 31 a of the central tooth 31 comes into contact with the package 1, and the package 1 is cut by piercing the package 1. At the front end section Wa, as the packaging container 100 is twisted in the α direction in FIG. 1, the puncture of the package 1 with the large teeth 32 and the puncture and cutting of the package 1 with the small teeth 34 are performed in order, The package 1 is cut open from T to both ends of the V-shape. Before the package 1 is inserted into the bottom of the large tooth 32, the small teeth 34 cut the package 1, so that the tear propagation of the package 1 is performed smoothly, without giving the user a sense of resistance, The package 1 can be easily cut.

When the packaging container 100 is further twisted in the α direction in FIG. 1, the teeth 35 arranged in the intermediate section Wb sequentially contact each other to open the package 1, and the cutting of the package 1 is the package 1 in both end sections Wc. The cutting proceeds smoothly to both ends of the wire, and the cutting is completed. Since the package 1 is sufficiently weakened by cutting at the tip end section Wa, the package 1 can be cut with a small force by tear propagation in the intermediate section Wb and the both end sections Wc.

  The material of the cutting blade 30 is not particularly limited, and examples thereof include metal, paper, vulcanized paper, resin-impregnated paper, and resin. The cutting blade 30 for packaging containers according to this embodiment includes a form made of metal. As described above, the cutting blade 30 for a packaging container according to this embodiment achieves both good cutting performance and safety by the arrangement of the teeth 31, 32, 33, 34, and 35 that form the cutting blade 30. Therefore, in the form made of metal, the management of burrs becomes unnecessary. Further, even when formed of a material that does not generate burrs other than metal, excellent cutting performance can be realized.

FIG. 4 is a partially enlarged front view showing a second form of the tip section and the middle section of the cutting blade for a packaging container according to the present embodiment. In the cutting blade 40 for packaging containers according to this embodiment, it is preferable that the depth of the root of the center tooth 41 is deeper than the extension line Lb2 of the reference line Lb1. As a result, the tooth tip angle θ1 of the central tooth 41 and the tooth tip angle θ2 of the central large tooth 43 become sharper and easy to puncture the package 1. Moreover, the length from the tooth tip 43a of the central large tooth 43 to the tooth bottom becomes long, and the package 1 can be cut efficiently. Therefore, the package 1 can be easily stabbed at the initial stage of cutting, and the cutting can be performed efficiently, and the tear is propagated by using the formed scratch as a trigger. Can be cut.

FIG. 5 is a schematic view showing a third form of the tip section and the middle section of the cutting blade for a packaging container according to the present embodiment, (a) is a partially enlarged front view of a V-shaped cutting blade, (B) is the elements on larger scale of the part enclosed with the broken line of (a). In the cutting blade 50 for a packaging container according to the present embodiment, the interval W1 between the tooth tip 51a of the central tooth 51 and the tooth tip 53a of the tooth 53 adjacent to the central tooth 51 is the tooth tip between other adjacent teeth. It is preferable that the intervals W2, W3, and W4 be larger. Since the central large teeth 53 are wide, the physical strength of the central large teeth 53 can be increased, and the durability of the cutting blade 50 can be improved. Further, the length of the hypotenuse extending from the tooth tip 53a of the central large tooth 53 toward the tooth bottom is increased, and the package 1 can be efficiently cut.

The distances W2, W3, and W4 between the other adjacent teeth are the distance W2 between the central large teeth 53 and the small teeth 54 adjacent to the central large teeth 53, and the large teeth 52 arranged in the tip section Wa. The interval W3 between the tooth tip 52a and the tooth tip 54a of the small tooth 54 and the interval W4 between the tooth tips 55a of the adjacent teeth 55 arranged in the intermediate section Wb. The intervals W1, W2, W3 of the tooth tips 51a, 52a, 53a, 54a of the teeth 51, 52, 53, 54 arranged in the distal end section Wa are the intervals W4 of the tooth tips 55a of the teeth 55 arranged in the intermediate section Wb. Is preferably larger. As a result, the number of teeth arranged in the tip section Wa can be reduced, and the force required at the initial stage of cutting can be further reduced. Moreover, the physical strength of the teeth arranged in the tip section Wa can be increased, and the durability of the cutting blade 50 can be improved.

FIG. 6 is a partially enlarged front view showing a fourth form of the tip section and the middle section of the cutting blade for a packaging container according to the present embodiment. In the cutting blade 60 for packaging according to the present embodiment, the depth of the root of the central tooth 61 is made deeper than the extension line Lb2 of the reference line Lb1, and the tooth tip 61a and the central large tooth 63 of the central tooth 61 are used. It is preferable to make the space | interval with the tooth | gear tip 63a larger than the space | interval of the tooth | gear tip of other adjacent teeth. Thus, the durability of the central large teeth 63 can be improved while maintaining the length from the tooth tips 63a of the central large teeth 63 to the roots and efficiently cutting the package 1.

  The packaging container which concerns on this embodiment is provided with the cutting blade for packaging containers which concerns on this embodiment. The cutting blade for a packaging container according to the present embodiment has a good cutting property even in a state where there is no burr due to the arrangement of teeth forming the cutting blade, and there is no portion in which the tooth tip protrudes greatly. Therefore, the user can easily and safely cut the package with a small force by using the packaging container according to the present embodiment.

  In the first embodiment to the fourth embodiment, the teeth arranged in the tip section Wa are large teeth 32, 42, 52, 62 and small teeth 34, 44, 54, 64, “large teeth”, “small teeth”, Although they are alternately arranged as “large teeth” (see FIGS. 2 and 4 to 6), the present invention is not limited to this arrangement. As a modification, for example, two small teeth are arranged between adjacent large teeth such as “large teeth”, “small teeth”, “small teeth”, “large teeth”,. . Further, a configuration in which “medium teeth” having a tooth height intermediate between the large teeth 32, 42, 52, 62 and the small teeth 34, 44, 54, 64 is arranged between the “large teeth” and the “small teeth”. It is.

  In the first to fourth embodiments, the cutting blades 30, 40, 50, 60 are formed in line symmetry with the center line C as the axis of symmetry. However, the present invention is not limited to this, and the center line C Can be formed asymmetrically.

  In the packaging container 100 of FIG. 1, the cutting blade 30 includes a plurality of teeth arranged in a V shape having a substantially V-shaped apex T on the center line C. However, the present invention is not limited thereto. A plurality of teeth can be arranged by shifting the vertex T of the character to the right or left with respect to the center line C.

  According to the present invention, the cutting blade for a packaging container according to the present invention has a good cutting property even in the absence of burrs, and a portion in which the tooth tip protrudes larger than the tooth tip of other teeth Because it is a shape that takes into account safety for users, for example, wrap films used as packaging containers for foods, aluminum foil, paper sheets, or wrap films used as packing materials such as load collapse prevention Suitable as a packaging container.

DESCRIPTION OF SYMBOLS 1 Package 5 Roll 10 Container main body 11 Main body bottom plate 12 Main body front plate 12a Bottom side of main body front plate 13 Main body rear surface plate 14 Main body left side plate 15 Main body right side plate 20 Lid 21 Top surface plate 22 Lid front plate 22a Lower end of lid front plate Side 24 Lid left side plate 25 Lid right side plate 30, 40, 50, 60 Cutting blade 30a Cutting sides 31, 41, 51, 61 Central teeth 31a, 41a, 51a, 61a Central tooth tips 32, 42, 52, 62 Large Teeth 32a, 42a, 52a, 62a Large tooth tips 33, 43, 53, 63 Central large teeth 33a, 43a, 53a, 63a Central large teeth tooth tips 34, 44, 54, 64 Small teeth 34a, 44a, 54a , teeth arranged 64a small teeth of the addendum 35,45,55,65 teeth arranged in an intermediate portion compartment 35a, 45a, 55a, the addendum 35b intermediate side section of teeth arranged 65a intermediate side section Tooth base 100 Packaging container T Vertex apex Wa Tip section Wb Middle section Wc Both ends section C Center line La1 Virtual line La2 Virtual line extension line Lb1 Reference line Lb2 Reference line extension line Lc Central large tooth Tip line Ld Small tooth tip line

Claims (7)

A packaging container that is attached to a packaging container that accommodates a roll around which a package is wound, has a plurality of teeth arranged in a substantially V shape along the axial direction of the roll, and that cuts the package drawn from the roll Cutting blade for
A tip section including the apex of the substantially V-shape and a pair of center sections connected to both ends of the tip section;
The teeth arranged in the tip section have a central tooth located at the center of the tip section, a large tooth, and a small tooth having a tooth height smaller than the tooth height of the large tooth,
The tooth tips of the teeth arranged in the central section are on a substantially V-shaped imaginary line,
A cutting blade for a packaging container, wherein tooth tips of teeth arranged in the tip section are on an extension line of the imaginary line or on a tooth bottom side of each tooth with respect to the extension line.   The cutting blade for a packaging container according to claim 1, wherein the depth of the root of the central tooth is deeper than an extended line of a reference line connecting the roots of the teeth arranged in the central section.   The space between the tooth tip of the central tooth and the tooth tip of the tooth adjacent to the central tooth is larger than the space between the tooth tips of other adjacent teeth. Cutting blade for packaging containers.   The width | variety of the said front-end | tip part division is 10-60 mm, The cutting blade for packaging containers as described in any one of Claims 1-3 characterized by the above-mentioned.   It consists of metal, The cutting blade for packaging containers as described in any one of Claims 1-4 characterized by the above-mentioned. Both sides of the central tooth are the large teeth,
The tooth tip of the central tooth is located on the tooth bottom side of the central large tooth tip line connecting the tooth tips of the large tooth sandwiching the central tooth. The cutting blade for packaging containers as described.   A packaging container comprising the cutting blade according to claim 1.

Images