JP5069075B2 - Cutting blade for packaging container and packaging container having the same - Google Patents

Description

  The present invention relates to a packaging container for housing a wrap film wound in a roll shape on a cylindrical core, and a cutting blade used in the packaging container.

  Conventionally, various types of wrap film packaging containers are known. Most of them are made of cardboard, and are composed of a container main body for storing a wrap film wound in a roll shape, and a lid provided integrally with the container main body. And the wrap film pulled out from the container is cut | disconnected by the sawtooth-shaped cutting blade attached to the back surface of the front wall of a cover body.

  As such cutting blades, metal ones are generally used from the viewpoints of cutability and durability. However, in consideration of recent environmental problems and user safety, paper and resin are used. Non-metallic ones made of metal are being considered.

  Such non-metal cutting blades are difficult to exhibit as good cutting performance as metal cutting blades, especially for cutting wrap films such as polyethylene, polypropylene, polyvinylidene chloride, etc. Since a large force is required, it is required to improve the cutting performance.

  In order to meet such demands, various shapes of cutting blades have been proposed. For example, in a cutting blade having a linear shape, by providing teeth with tooth tips facing outward at both ends of the cutting blade, the teeth can easily bite into the wrap film (for example, Patent Documents 1 and 2), cutting In a V-shaped cutting blade in which the center portion of the blade is closer to the bottom of the container than the side portion, the teeth bite into the wrap film at the beginning of cutting by arranging larger teeth at the V-shaped apex portion. (E.g., Patent Documents 3 and 4), a cutting blade having an inverted V-shaped shape in which the side area of the cutting blade protrudes from the central portion, contrary to the V-shaped shape. In Japanese Patent Application Laid-Open No. H11-228561, for example, there are proposed ones that have teeth with tooth tips facing outward at both ends (for example, Patent Document 5).

By the way, the cutting method of the wrap film with the cutting blade with which the packaging container was equipped usually changes with shapes of a cutting blade. For example, in the case of a V-shaped cutting blade, the wrap film contained in the packaging container is pulled out, the wrap film pulled out from the packaging container is applied to the protruding teeth at the center, and the packaging container is twisted. Then, the teeth are cut into the central part of the wrap film and cut. On the other hand, in the case of a straight or inverted V-shaped cutting blade, the wrap film accommodated in the packaging container is pulled out, and the desired amount of wrap film drawn from the packaging container is applied to one end of the cutting blade. Then, the wrap film is cut by pulling the wrap film so that the teeth of the end portion are bitten and then opened from the end portion of the cutting blade toward the opposite end portion.
Japanese Utility Model Publication No. 6-20224 Japanese Utility Model Publication No. 11-151 Registered Utility Model No. 2547868 JP-A-5-178344 JP-A-8-40433

  The inventors of the present invention have studied the cutting property, sharpness, and durability of the wrap film using the cutting blades having the various shapes described above. As a result, the conventional linear cutting blades as in Patent Documents 1 and 2 are compared with the conventional V-shaped cutting blades as in Patent Documents 3 and 4, and the wrap film after biting in the wrap film. It was found that the wrap film was not sufficiently cut because it was difficult to smoothly open. Moreover, the cutting blade like patent document 5 which provided the tooth | gear which protruded at the edge part of the cutting blade also made the wrap film bite compared with the conventional V-shaped cutting blade like patent documents 3 and 4 It has been found that the subsequent wrapping film tends to be difficult to smoothly open and there is a problem with the durability of the teeth.

  However, as a result of further detailed investigations by the present inventors, as described below, even when conventional V-shaped cutting blades such as Patent Documents 3 and 4 are used, the cutting ability is sufficient. It became clear that it was not. That is, although the cutting blades of various shapes as described above are used in the wrap film packaging container, the user does not always adopt the optimum cutting method by checking the shape of the cutting blades one by one. Even when a letter-shaped cutting blade is provided, there are many cases where the wrap film is to be cut from the end of the cutting blade toward the opposite end. Thus, when the wrap film is cut by the cutting method of cutting from the end portion of the cutting blade, the cutting blade having the conventional V-shaped shape as in Patent Documents 3 and 4 described above has a cutting property. It became clear that it was not enough.

  The present invention has been made in view of such circumstances, and the cutting performance is good regardless of whether the wrap film is cut from the V-shaped apex of the cutting blade or one end of the cutting blade, and An object is to provide a cutting blade sufficiently excellent in feeling and durability at the time of cutting, and a packaging container provided with such a cutting blade.

The cutting blade of the present invention is a non-metallic V-shaped cutting blade having a plurality of teeth that is attached to a packaging container that accommodates a roll package and cuts the roll package. ,
(A) A central area including a V-shaped apex, a pair of side areas each including one of both ends of the V-shaped, and a pair of intermediate areas sandwiched between the pair of side areas and the central area. Divided into
(B) The central area has a plurality of first teeth having the highest tooth height and the same tooth height, and a plurality of second teeth having a lower tooth height and the same tooth height.
(C) One of the first teeth is disposed at the vertex, and the other first teeth are disposed at a predetermined interval around the first tooth of the vertex,
(D) the second teeth are disposed between the first teeth;
(E) A first straight line connecting the tooth tips of the first tooth, a second straight line connecting the tooth tips of the second tooth, and a third straight line connecting the tooth teeth of the first tooth and the second tooth are parallel to each other. And the second straight line is located between the first straight line and the third straight line,
(F) the intermediate area has a plurality of intermediate teeth;
(G) The tip of the intermediate tooth is located on the second straight line or between the second straight line and the third straight line,
(H) the side area has a plurality of side teeth;
(I) The tooth tips of the side teeth are located on the second straight line or between the first straight line and the second straight line.

  By providing a central area having the above-described tooth configuration on the cutting blade, when cutting the wrap film from the central area including the V-shaped apex of the cutting blade, cutting of the wrap film as a medium, It is divided into two stages: a “piercing” stage at the beginning of cutting by the central area and a “cutting” stage by the intermediate and side areas thereafter. Furthermore, the “piercing” stage is divided into two steps: a piercing step with the first tooth having the highest tooth height and a piercing step with the second tooth having a lower tooth height than the first tooth. Since only the first tooth is in contact with the wrap film at the beginning of cutting, the force required for piercing is small. In addition, with only the first tooth, a force is required to pierce the wrap film due to the resistance of the valley portion (tooth base) between the first teeth, but after the piercing with the first tooth, the second tooth penetrates the wrap film. Thus, the “piercing” stage at the beginning of cutting the wrap film can be further facilitated. Thereafter, the transition from the “piercing” stage to the “cut-opening” stage can be facilitated by an intermediate tooth having a relatively low tooth height provided in the intermediate area. Thereafter, the wrap film is smoothly cut open in the side area, and the wrap film is cut. On the other hand, when the cutting of the wrap film is started from the side area of the cutting blade, the cutting of the wrap film, which is the medium, is performed at the initial “piercing” stage by the one side area, and by the other areas thereafter. It is divided into two stages, the “cut open” stage. Since the side teeth in the side area protrude higher than the intermediate teeth in the intermediate area, the teeth that contact the wrap film at the beginning of cutting are only a few side teeth on the cutting blade end side. . Therefore, the force required to pierce the wrap film at the beginning of cutting can be small. Thereafter, the transition from the “piercing” stage to the “cut-opening” stage can be facilitated by an intermediate tooth having a low tooth height provided in one intermediate area. Subsequently, the wrap film is smoothly cut open in the central area, the other intermediate area, and the other side area, and the wrap film is cut. Therefore, the wrap film can be easily and smoothly cut both when the wrap film is cut from the end portion of the wrap film and when it is started from the center portion of the wrap film. The tooth height of each tooth can be measured as the shortest distance between the bottom of a valley formed by adjacent teeth, that is, the third straight line connecting a plurality of tooth roots, and the tooth tip of the tooth.

  Moreover, it is preferable that at least one tooth tip of the plurality of side teeth is directed outward from the tooth tips of the first tooth, the second tooth, and the intermediate tooth. That is, it is preferable that the oblique side on the top side of the cutting blade in at least one side tooth is longer than the oblique side on the end portion side of the cutting blade.

  In this way, the tip of the side tooth in the side area is directed outward from the tip of the first tooth, the second tooth and the intermediate tooth, so that from the end of the wrap film, that is, the side area of the cutting blade When the cutting of the wrap film is started, the wrap film can be further pierced. In addition, even when the cutting of the wrap film is started from the central area including the V-shaped apex of the cutting blade, the wrap film becomes more difficult to catch when it is cut in the side area, and the wrap film is cut at the “cut open” stage. Can be made smoother.

  Moreover, it is preferable that the tooth height of a side tooth | gear is the same as a 2nd tooth, or it is higher than a 2nd tooth, and is lower than a 1st tooth.

  By providing such side teeth in the side area, when the wrap film is started to be cut from the side area of the cutting blade, the wrap film can be further pierced.

In another aspect, the cutting blade of the present invention is attached to a packaging container that accommodates a roll-shaped package and cuts the roll-shaped package. In the blade, the cutting blade is
(A) A central area including a V-shaped apex, a pair of side areas each including one of both ends of the V-shaped, and a pair of intermediate areas sandwiched between the pair of side areas and the central area. Divided into
(B) The central area has a plurality of first teeth having the highest tooth height and the same tooth height, and a plurality of second teeth having a lower tooth height and the same tooth height.
(C) One of the first teeth is disposed at the vertex, and the other first teeth are disposed at a predetermined interval around the first tooth of the vertex,
(D) the second teeth are disposed between the first teeth;
(E) A first straight line connecting the tooth tips of the first tooth, a second straight line connecting the tooth tips of the second tooth, and a third straight line connecting the tooth teeth of the first tooth and the second tooth are parallel to each other. And the second straight line is located between the first straight line and the third straight line,
(F) the intermediate area has a plurality of intermediate teeth;
(G) The tip of the intermediate tooth is located on the second straight line or between the second straight line and the third straight line,
(H) the side area has a plurality of side teeth;
(J) The tooth tips of the side teeth are such that at least one tooth tip of the plurality of side teeth faces outward from the tooth tips of the first tooth, the second tooth, and the intermediate tooth. It is characterized by.

  By providing a central area having the above-described tooth configuration on the cutting blade, when cutting the wrap film from the central area including the V-shaped apex of the cutting blade, cutting of the wrap film as a medium, It is divided into two stages: a “piercing” stage at the beginning of cutting by the central area and a “cutting” stage by the intermediate and side areas thereafter. Furthermore, the “piercing” stage is divided into two steps: a piercing step with the first tooth having the highest tooth height and a piercing step with the second tooth having a lower tooth height than the first tooth. Since only the first tooth is in contact with the wrap film at the beginning of cutting, the force required for piercing is small. In addition, with only the first tooth, a force is required to pierce the wrap film due to the resistance of the valley portion (tooth base) between the first teeth, but after the piercing with the first tooth, the second tooth penetrates the wrap film. Thus, the “piercing” stage at the beginning of cutting the wrap film can be further facilitated. Thereafter, the transition from the “piercing” stage to the “cut-opening” stage can be facilitated by an intermediate tooth having a relatively low tooth height provided in the intermediate area. Thereafter, the wrap film is smoothly cut open in the side area, and the wrap film is cut. Since at least one tooth tip of the side teeth in the side area faces outward than the other tooth tips, the wrap film becomes more difficult to catch when opening in the side area, Cutting can be made smoother. On the other hand, when the cutting of the wrap film is started from the side area of the cutting blade, the cutting of the wrap film, which is the medium, is performed at the initial “piercing” stage by the one side area, and by the other areas thereafter. It is divided into two stages, the “cut open” stage. Since the side area is provided with side teeth facing outward from the tooth tips of the first tooth, the second tooth, and the intermediate teeth, the force required to pierce the wrap film at the beginning of cutting is small. . Thereafter, the transition from the “piercing” stage to the “cut-opening” stage can be facilitated by an intermediate tooth having a low tooth height provided in one intermediate area. Subsequently, the wrap film is smoothly cut open in the central area, the other intermediate area, and the other side area, and the wrap film is cut. Therefore, the wrap film can be easily and smoothly cut both when the wrap film is cut from the end portion of the wrap film and when it is started from the center portion of the wrap film. The tooth height of each tooth can be measured as the shortest distance between the bottom of a valley formed by adjacent teeth, that is, the third straight line connecting a plurality of tooth roots, and the tooth tip of the tooth.

  Moreover, it is preferable that an intermediate | middle area has two types of large-sized and small-type intermediate teeth from which tooth height which is arrange | positioned alternately differs.

  By providing such intermediate teeth in the intermediate area, the number of intermediate teeth that are in contact with the wrap film at the same time is reduced during the transition from the “piercing” stage to the “cutting” stage and in the “cutting” stage in cutting the wrap film. be able to. Therefore, the transition from the “piercing” stage to the “cut-opening” stage is made smoother than when a plurality of intermediate teeth having the same tooth height is provided, and the wrap film can be cut open and cut with a smaller force. Become.

  Moreover, it is preferable that the tooth height of an intermediate tooth is the same as that of a 2nd tooth, or is lower than a 2nd tooth.

  By providing such intermediate teeth in the intermediate area, it is possible to cut the wrap film with a more excellent feeling in the “opening” stage in the wrap film cutting.

  In addition, the hypotenuse of at least one of the first tooth, the second tooth, the intermediate tooth, and the side teeth has an arcuate shape that is recessed inward, that is, the tooth shape is a so-called ginkgo leaf shape. Is preferred.

  With such a shape, it is possible to widen the interdental pitch while making the tooth tip angle an acute angle in order to ensure cutting performance. Thereby, it is not necessary to increase the number of teeth belonging to a certain length range in the longitudinal direction of the cutting blade, and it is possible to suppress an increase in the force required to pierce the wrap film. Moreover, since the width becomes wider toward the end, the effect of improving the durability of the teeth can be obtained.

  If the cutting blade of this invention adhere | attaches this on a packaging container, it can provide the packaging container excellent in the cutting property. In addition, it is preferable that the cutting blade of this invention is attached to the back surface of the front wall of a packaging container through modified polyethylene resin. Thereby, the cutting blade can be reliably fixed to the packaging container with sufficient strength. Examples of the modified polyethylene resin include an ethylene vinyl acetate copolymer, an ethylene methacrylic acid copolymer, and an ionomer mainly composed of an ethylene resin. Among these, an ethylene methacrylic acid copolymer is particularly preferable.

  According to the present invention, cutting performance is good regardless of whether the wrap film is cut from the V-shaped apex portion of the cutting blade or one end portion of the cutting blade, and in the feeling and durability at the time of cutting. A sufficiently excellent cutting blade and a packaging container provided with such a cutting blade can be provided.

[First embodiment]
FIG. 1 is a perspective view showing a form of a packaging container 10 to which the present invention is applied. The packaging container 10 is made of a single cardboard, preferably coated cardboard. As shown in FIG. 1, a packaging container 10 includes a container body 16 for storing a wrap film 14 wound around a cylindrical paper tube 12 in a roll shape, and a lid provided integrally with the container body 16. It consists of a body 18. When the lid is closed, the overall shape of the packaging container 10 is a substantially rectangular parallelepiped shape. In this embodiment, the wrap film is made of polyvinylidene chloride.

  The upper part of the container body 16 is opened as an opening for pulling out the wrap film 14. Further, the lid 18 extends continuously from the top edge 20 of the rear wall of the container body 16. Therefore, the lid 18 can be rotated with respect to the container main body 16 and can cover the opening of the container main body 16.

  The front edge of the front wall 22 of the lid 18 is V-shaped, and the cutting blade 24 is also V-shaped in accordance with the shape. The cutting blade 24 according to the present embodiment includes a central area 28 including a V-shaped apex, a pair of intermediate areas 29 respectively disposed on both sides thereof, and a side of the intermediate area 29 opposite to the central area 28 side. It is divided into five areas with a pair of side areas 30 arranged respectively. Below, the cutting blade 24 which concerns on this embodiment is demonstrated in detail.

  FIG. 2 is a partially enlarged view of the central portion of the cutting blade according to the first embodiment of the present invention. The cutting blade 24 according to the present embodiment is symmetrical with respect to a center line (reference numeral CL in FIG. 2) passing through the V-shaped apex, and includes a central area 28 and intermediate areas 29 arranged on both sides thereof. Is provided.

  The center area 28 according to the present embodiment is composed of 15 teeth 35, 36, and 38, as clearly shown in FIG. The teeth in the central area 28 are teeth having a small tooth height (hereinafter referred to as “small teeth”) 35, teeth having a tooth height higher than the small teeth 35 (second teeth: hereinafter referred to as “medium teeth”) 36, and There are three types of teeth (first teeth: hereinafter referred to as “large teeth”) 38 having a higher tooth height than the middle teeth 36. In the following description, alphabetic suffixes are appropriately added to the reference numerals 36 and 38 for the middle teeth and the large teeth. The tooth height of the tooth can be measured as the shortest distance between the straight line (third straight line) L3 connecting the tooth base and the apex of the tooth.

  One of the large teeth 38 (38a) is located at the V-shaped apex (the center in the longitudinal direction of the central area 28) of the cutting blade 24, and the other large teeth 38b and 38c are centered on the central large tooth 38a. Two are arranged on the left and right at regular intervals. The tooth tip of the first first large tooth 38a in the center and the tooth tips of the second and third large teeth 38b, 38c on the left and right sides can be connected with a straight line. The straight line (first straight line) L1 is located on the front side (the side away from the front end edge of the lid front wall 22 in FIG. 1) than the tooth tips of the middle teeth 36 on the left and right sides of the central area 28. That is, the tooth tip of the middle tooth 36 is located between a straight line (third straight line) L3 and a straight line L1 connecting the tooth bases.

  In addition, eight middle teeth 36 in the central area 28 are arranged, four on each of the left and right sides. The four middle teeth 36a, 36b on the center side are arranged at regular intervals between the large teeth 38a, 38b, 38c, and the other four middle teeth 36c, 36d are the third large teeth at the same interval. It is arranged outside 38c. The tooth tips of the middle teeth 36a, 36b, 36c and 36d on the left and right sides can be connected by a straight line (second straight line) L2, and the straight line L2 on the left and right sides is substantially parallel to the straight line L1, And it is located in the back side (side near the front-end edge of the lid body front wall 22) rather than the straight line L1. That is, the straight line L2 is located between the straight line L1 and the straight line L3.

  In the intermediate area 29, two kinds of intermediate teeth 31 and 32 having different tooth heights are provided alternately in the longitudinal direction of the cutting blade 24. An intermediate tooth (hereinafter referred to as “intermediate first tooth”) 31 having a lower tooth height than the intermediate tooth 32 has the same tooth height as the small tooth 35 in the central area 28, and has a tooth height higher than that of the intermediate first tooth 31. The intermediate teeth (hereinafter referred to as “intermediate second teeth”) 32 have the same tooth height as the intermediate teeth 36 in the central area 28. A straight line L <b> 2 that connects the tips of the middle teeth 36 of the central area 28 passes through the tips of the intermediate second teeth 32 of the intermediate area 29. Further, a straight line (fourth straight line) L4 connecting the tip of the small tooth 35 in the central area 28 and the tip of the intermediate first tooth 31 in the intermediate area 29 is a straight line connecting the tip of the large tooth 38 in the central area 28. It is substantially parallel to L1 and the straight line L2, and is located behind the straight line L2 (on the side closer to the leading edge of the lid front wall 22). That is, the straight line L4 is located between the straight line L2 and the straight line L3. Thus, by arranging the tooth tips of the intermediate teeth 31 and 32 in the intermediate area 29 on the same straight line as the straight lines L1 and L2 or a straight line parallel to the straight lines L1 and L2, respectively, it is possible to further smoothly open the wrap film. .

  FIG. 3 is a partially enlarged view of one side portion of the cutting blade according to the first embodiment of the present invention. The cutting blade 24 according to the present embodiment includes a side area 30 on the opposite side of the intermediate area 29 from the central area 28 side. Although the end of the cutting blade 24 is not clearly shown in FIG. 3, the cutting teeth 24 are formed with teeth 39 up to the end as in FIG. In addition, the cutting blade 24 of this embodiment is equipped with the same tooth | gear as FIG.

  The side area 30 is provided with side teeth 39 whose tooth tips face outward. The tooth tips of the side teeth 39 can be connected by a straight line (fifth straight line) L5. The straight lines L5 on the left and right sides are connected to the straight line L2 and the intermediate first tooth connecting the tooth tips of the intermediate second tooth 32 of the intermediate area 29. It is substantially parallel to the straight line L4 connecting the apexes 31 and is located on the front side (the side away from the front edge of the lid front wall 22 in FIG. 1) than the straight lines L2 and L4. Further, the straight line L5 connecting the tooth tips of the side teeth 39 is located on the rear side (side closer to the tip edge of the lid front wall 22) than the straight line L1 connecting the tooth tips of the large teeth 38 in the central area 28. Yes. That is, the straight line L5 is located between the straight line L1 and the straight line L2. Note that the tooth tips of the side teeth 39 may be located on the straight line L2. Thus, by arranging the tooth tips of the side teeth 39 of the side area 30 on a straight line parallel to the straight lines L2 and L4, it is possible to further smoothly open the wrap film.

  The direction of the tooth tip of each tooth can be obtained with reference to the direction of a straight line connecting the midpoint between the tooth roots on both sides of the tooth and the tooth tip of the tooth. The straight line (K1) of the side teeth 39 extends in a direction farther from the center line CL (FIG. 2) of the cutting blade than the straight line (K2) of the intermediate teeth 31 and 32 in front of the cutting blade 24 (projecting direction). Therefore, the tooth tips of the side teeth 39 are directed outward from the tooth tips of the intermediate first tooth 31 and the intermediate second tooth 32.

  In the cutting blade 24 according to the present embodiment, the tooth tip angles α (FIGS. 2 and 3) of the small teeth 35, the middle teeth 36, the large teeth 38, the intermediate first teeth 31 and the intermediate second teeth 32 are laps. The angle is suitable for piercing the film 14. In the present embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tooth tip angle α is preferably in the range of 30 ° to 90 °, more preferably 40 ° to 70 °. This is because if it is larger than 90 °, a great force is required to pierce the wrap film 14, and if it is smaller than 30 °, the durability of the teeth 31 to 38 itself tends to be impaired. On the other hand, the tooth tip angle β of the side teeth 39 is also an angle suitable for piercing the wrap film 14. In the present embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tooth tip angle β is preferably in the range of 20 ° to 60 °, and more preferably 20 ° to 40 °. This is because if it is larger than 60 °, a great force is required to pierce the wrap film 14, and if it is smaller than 20 °, the durability of the side teeth 39 itself tends to be impaired.

  The side teeth 39 are parallel to the center line CL (FIG. 2) of the cutting blade 24 and pass through the teeth on the outer side of the side teeth 39 (the end side of the cutting blade) and the outer sides of the side teeth 39. It is preferable that the angle γ (FIG. 3) formed with the hypotenuse on the end side of the cutting blade is 2 to 20 °. This makes it possible to achieve a higher level of cutting performance both when the side teeth 39 are used for piercing the wrap film and when used for cutting the wrap film.

  Further, the shape of each of the small teeth 35, the middle teeth 36, the large teeth 38, the intermediate first teeth 31 and the intermediate second teeth 32 may be a simple isosceles triangle shape. It is preferable that at least one of them is a divergent shape that is in an arc shape recessed inward or a shape of a ginkgo leaf. The shape of the side teeth 39 may be straight on the hypotenuse of the triangle, but is preferably a divergent shape in which at least one of the hypotenuse is recessed inward or a shape of a ginkgo leaf. It is. This is because the tooth tip angles α and β are maintained at the above-mentioned acute angles while improving the durability. Further, in the case of such a shape, the number of teeth can be reduced within the same length range as compared to the case where the hypotenuse is linear, which contributes to reduction of the force required for cutting.

  Next, a method for cutting the wrap film 14 using the packaging container 10 having the cutting blade 24 according to the present embodiment will be described with reference to the drawings. As a method of cutting the wrap film 14, there are two cutting methods shown in FIGS. FIG.1 and FIG.4 is a perspective view which shows the form of the packaging container 10 with which this invention was applied. The packaging container 10 shown in FIGS. 1 and 4 includes a cutting blade 24 having the tooth configuration shown in FIGS. 2 and 3.

  In one cutting method (the method shown in FIG. 1), the wrap film 14 is first stabbed in the central area 28 including the V-shaped apex portion of the cutting blade 24, and then the intermediate area 29 on both sides and the side area 30 on both sides. In this order, the pierced wrap film 14 is cut open (hereinafter referred to as “cutting method 1” for convenience). In the other cutting method (the method shown in FIG. 4), the wrap film 14 is first stabbed in one side area 30a of the cutting blade 24, and then one intermediate area 29a adjacent to the side area 30a, the central area 28, and the other intermediate area 29b and the other side area 30b are cut in this order (hereinafter referred to as “cutting method 2” for convenience).

  In the cutting method 1, first, as shown in FIG. 1, the packaging container 10 is grasped with one hand, the center of the tip of the wrap film 14 is grasped with the other hand, and a desired amount is pulled out. Then, the thumb of the hand holding the packaging container 10 is applied to the central portion of the lid front wall 22, and the packaging container 10 is twisted forward, that is, in the direction of arrow A.

  At this time, the first large teeth 38a at the apex of the cutting blade 24 first contact the wrap film 14 and pierce it (FIG. 2). At the same time, the second large teeth 38b and further the third large teeth 38c contact the wrap film 14 and pierce it. In this way, since only the five large teeth 38 having a large interdental pitch and the highest tooth height are in contact with the wrap film 14 first, the force for twisting the packaging container 10 at the beginning of cutting is small. That is, since the minimum force required for each large tooth 38 to pierce the wrap film 14 is constant, a force that is approximately five times that force is the minimum force that twists the packaging container 10. When the tooth tip angle is reduced and the inter-tooth pitch is reduced as in the prior art, since the number of teeth in contact with the wrap film 14 is large, the force applied to the packaging container 10 is inevitably large. Although the feeling is also impaired, there is no such problem in the present embodiment.

  Subsequently, middle teeth 36 are in contact with the wrap film 14, and the wrap film 14 is penetrated by these middle teeth 36. Here, if it is assumed that there are no middle teeth 36, the pitch between the large teeth 38 is wide, so that the valleys (interdental) between the teeth 38 become resistance, and a large force is required to open the wrap film 14. Become. However, in this embodiment, since the middle teeth 36 penetrate the wrap film 14 between the large teeth 38 following the piercing of the wrap film 14 by the large teeth 38, the piercing of the wrap film 14 is facilitated. Although the maximum number of middle teeth 36 that are simultaneously in contact with the wrap film 14 is eight, the number of middle teeth 36 that are actually in contact with the wrap film 14 is actually less than eight. Therefore, the force required for the piercing by the middle teeth 36 is smaller than that for the piercing by the large teeth 38. In this way, the first-stage cutting by the large teeth 38 to the second-stage cutting by the middle teeth are smoothly performed without giving the user a sense of resistance.

  Further, when the packaging container 10 is twisted in the direction of arrow A, the small teeth 35 in the central area 28 pierce the wrap film 14 between the third and fourth middle teeth 36c, 36d, and the wrap film 14 is cut in the middle. Proceed to area 29. If a sufficiently large initial piercing portion is formed on the wrap film 14, then no particularly large force is required to cut the wrap film 14, and the intermediate first tooth 31 and the intermediate second tooth 32 are formed. Also in the side area 30 consisting of the intermediate area 29 and the side teeth 39 (FIG. 3), the wrap film 14 is smoothly opened and cut.

  In the cutting method 2, first, as shown in FIG. 4, the packaging container 10 is grasped with one hand, the tip on the side of the wrap film 14 is grasped with the other hand, and a desired amount is pulled out. And while fixing the container with the hand holding the packaging container 10, the other hand pulls up the wrap film 14 in the upward direction, that is, the arrow B direction, so that one end of the wrap film 14 is one of the cutting blades 24. Against the side area 30a.

  When the wrap film 14 is further pulled up in the direction of arrow B, several side teeth 39 belonging to the side area 30a and provided at the end of the cutting blade 24 pierce the wrap film 14 (FIG. 3). At substantially the same time, the wrap film 14 contacts several side teeth 39 provided on the intermediate area 29a side of the side area 30a. Further, when the wrap film 14 is pulled up in the direction of arrow B, the wrap film 14 is penetrated by these side teeth 39. When the wrap film 14 is pulled up in the direction of arrow B, the wrap film 14 is usually pulled slightly toward the front (user side), but the tooth tip of the side tooth 39 is the other teeth 31 to 38. Since the direction is more outward, the tension direction of the wrap film 14 and the tooth tip direction can be matched, and the wrap film 14 can be pierced more easily.

  Further, when the wrap film 14 is pulled up in the direction of arrow B, the cutting of the wrap film 14 shifts from the “piercing” stage to the “cutting” stage. That is, if a sufficiently large initial pierced portion is formed by the side teeth 39, no particularly large force is required for cutting the wrap film 14 thereafter, and the tooth height is lower than that of the side teeth 39. The lap film 14 is smoothly cut open by the intermediate area 29 including the intermediate first teeth 31 and the intermediate second teeth 32. Subsequently, the wrap film 14 is smoothly opened and cut also in the central area 28, the intermediate area 29b, and the side area 30b.

  When the cutting blade 24 according to the present embodiment is used, when the wrap film 14 is cut, a particularly large force is not necessary, and this is because the tooth tip angle α and the side portion of each tooth 31, 32, 35, 36, 38 are obtained. The necessity of excessively reducing the tip angle β of the tooth 39 is reduced, and as a result, the durability of each tooth 31, 32, 35, 36, 38, 39 is also improved.

  The number of teeth provided in the cutting blade 24 can be appropriately adjusted according to the length of the cutting blade 24 in the longitudinal direction and the inter-tooth pitch. However, in the cutting method 1, from the viewpoint of facilitating the piercing of the wrap film, the total number of teeth belonging to the central area 28 is preferably 5 to 31, more preferably 7 to 25, 9 More preferably, the number is -19. Further, in the cutting methods 1 and 2, the total number of teeth belonging to one intermediate area 29 is preferably 10 to 100, and preferably 20 to 90, from the viewpoint of further smoothing the opening of the wrap film. More preferably, the number is 40-60. In the cutting method 2, the total number of teeth belonging to one side area 30 is preferably 1 to 150, more preferably 5 to 100, from the viewpoint of facilitating the piercing of teeth into the wrap film. It is more preferable that the number is 10 to 50. If the total number of teeth belonging to the side area 30 becomes excessive, as a result, the area of the side area 30 in the cutting blade 24 becomes relatively large, and good cutting performance when cutting the wrap film by the cutting method 1 is impaired. Tend to be.

  When the tooth height (projection amount) of the large teeth 38 and the middle teeth 36 or the side teeth 39 is excessively increased, the distance from the fixed portion of the cutting blade 24, that is, the distance from the front edge of the lid front wall 22. May become longer and durability may be impaired. Further, if the tooth height is large, the hand of the person using the packaging container 10 may be injured. For this reason, from the viewpoint of cutting performance, durability, and safety, for example, the tooth height H1 of the large tooth 38 in the central area 28 is preferably 1.0 to 4.0 mm, more preferably 1.2 to 3.5 mm. The tooth height H2 of the middle teeth 36 is preferably 1.2 to 2.5 mm, preferably 0.8 to 2.0 mm, more preferably 0.9 to 1.5 mm, and the tooth height H3 of the small teeth 35 is The thickness is preferably 0.4 to 1.5 mm, more preferably 0.5 to 1.0 mm.

  The interdental pitch of the central area 28 is preferably 3.0 to 9.0 mm, more preferably 3.5 to 7.0 mm, and still more preferably 4.0 to 6.0 mm, between the large teeth 38. The distance between 36 is preferably 3.0 to 9.0 mm, more preferably 3.5 to 7.0 mm, and still more preferably 4.0 to 6.0 mm. When the inter-tooth pitch exceeds 9.0 mm, the film 14 is caught in the valleys (tooth roots) between the large teeth 38 in the “piercing” stage of the wrap film 14 in the cutting method 1 and the cutting tends to be hindered. There is. On the other hand, when the interdental pitch is narrower than 3.0 mm, the number of teeth provided in the central area 28 increases, and as a result, the force required for piercing increases, and good cutting properties tend to be impaired. There is.

  The tooth height H2 of the intermediate second tooth 32 in the intermediate area 29 is preferably 0.8 to 2.0 mm, more preferably 0.9 to 1.5 mm. The tooth height H3 of the intermediate first tooth 31 in the intermediate area 29 is preferably 0.4 to 1.5 mm, more preferably 0.5 to 1.0 mm. Further, the interdental pitch between the intermediate first teeth 31 and the interdental pitch between the intermediate second teeth 32 are preferably 1.0 to 3.5 mm, more preferably 1.5 to 3.0 mm. .

  The tooth height H4 of the side teeth 39 in the side area 30 is preferably 0.8 to 3.5 mm, more preferably 0.9 to 2.0 mm, and still more preferably 1.0 to 1.5 mm. Good. The interdental pitch of the side teeth 39 is preferably 0.5 to 3.5 mm, more preferably 0.7 to 2.5 mm.

[Second Embodiment]
FIG. 5 is a partially enlarged view of one side portion of the cutting blade according to the second embodiment of the present invention. The cutting blade 24a of FIG. 5 differs from the cutting blade 24 of the said embodiment by the point provided with the side teeth 33 and 34 in the side part area 30. FIG. That is, the cutting blade 24a has a tooth configuration similar to that of the cutting blade 24 of the above embodiment in the central area (not shown) and the intermediate area 29 (FIG. 2). The cutting blade 24a has the same tooth configuration as that of FIG. 5 in the other side area and the intermediate area.

  In the side area 30 of the cutting blade 24a of the present embodiment, side small teeth 33 having the same shape and tooth height as the intermediate first teeth 31 of the intermediate area 29, and side large teeth whose tooth tips are directed outward. 34 are provided alternately. The tooth tip of the side large tooth 34 is located on a straight line L <b> 2 that connects the tooth tip of the middle tooth 36 of the central area 28 and the tooth tip of the intermediate second tooth 32 of the intermediate area 29. Further, the tooth tips of the side small teeth 33 are located on a straight line L4 connecting the tooth tips of the intermediate first teeth 31 of the intermediate area 29.

  The side small teeth 33 have a tip angle equivalent to the tip angle α of the intermediate first tooth 31 and the intermediate second tooth 32. The shape of the side small teeth 33 may be a simple isosceles triangle shape, but is preferably a divergent shape in which at least one of the hypotenuses has an arc shape recessed inward. Accordingly, the durability can be improved while maintaining the tooth tip angle α at an acute angle to some extent. Further, in the case of such a shape, the number of teeth can be reduced within the same length range as compared to the case where the hypotenuse is linear, which contributes to reduction of the force required for cutting.

  The direction of the tooth tip of each tooth can be obtained with reference to the direction of a straight line connecting the midpoint between the tooth roots on both sides of the tooth and the tooth tip of the tooth. The straight line (K3) in the side large teeth 34 is farther from the center line CL (FIG. 2) of the cutting blade than the straight line (K2) of the intermediate teeth 31 and 32 in front of the cutting blade 24a (projecting direction). Since it extends, the tooth tip of the side large tooth 34 faces outward than the tooth tip of the intermediate teeth 31, 32 and the side small tooth 33.

  In the cutting blade 24a according to the present embodiment, the tip angles α (FIGS. 2 and 5) of the small teeth 35, the middle teeth 36, the large teeth 38, the intermediate first teeth 31 and the intermediate second teeth 32 are laps. The angle is suitable for piercing the film 14. In the present embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tooth tip angle α is preferably in the range of 30 ° to 90 °, more preferably 40 ° to 70 °. This is because if it is larger than 90 °, a great force is required to pierce the wrap film 14, and if it is smaller than 30 °, the durability of the teeth 31 to 38 itself tends to be impaired. On the other hand, the tooth tip angle β of the side large teeth 34 is also an angle suitable for piercing the wrap film 14. In the present embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tooth tip angle β is preferably in the range of 20 ° to 60 °, and more preferably 20 ° to 40 °. This is because if the angle is larger than 60 °, a large force is required to pierce the wrap film 14, and if it is smaller than 20 °, the durability of the side large teeth 34 itself tends to be impaired.

  The side large teeth 34 are parallel to the center line CL (FIG. 2) of the cutting blade and pass through the teeth outside the side large teeth 34 (the end side of the cutting blade) and the side teeth 39. It is preferable that an angle γ (FIG. 5) formed with the oblique side of the outer side (the end side of the cutting blade) is 2 to 20 °. This makes it possible to achieve a higher level of cutting performance in both the case where the side large teeth 34 are used for piercing the wrap film and the case where the side large teeth 34 are used for opening the wrap film.

  The shape of the side large teeth 34 is preferably a divergent shape in which at least one of the oblique sides is in an arcuate shape or a shape of a ginkgo leaf, rather than a straight shape of each side of the triangle. is there. This is to improve the durability while maintaining the tooth tip angle β at the aforementioned acute angle. Further, in the case of such a shape, the number of teeth can be reduced within the same length range as compared to the case where the hypotenuse is linear, which contributes to reduction of the force required for cutting.

  Next, a method for cutting the wrap film 14 using a packaging container having the cutting blade 24a according to the present embodiment will be described with reference to the drawings. As a method of cutting the wrap film 14, there are two cutting methods shown in FIGS. FIG.1 and FIG.4 is a perspective view which shows the form of the packaging container 10 with which this invention was applied. The packaging container 10 shown in FIGS. 1 and 4 includes a cutting blade 24a having the tooth configuration shown in FIGS.

  In one cutting method (the method shown in FIG. 1), the wrap film 14 is first stabbed in the central area 28 including the V-shaped apex portion of the cutting blade 24a, and then the intermediate area 29 on both sides and the side area 30 on both sides. In this order, the pierced wrap film 14 is cut open (hereinafter referred to as “cutting method 1” for convenience). In the other cutting method (the method shown in FIG. 4), the wrap film 14 is first stabbed in one side area 30a of the cutting blade 24a, and then one intermediate area 29a adjacent to the side area 30a, the central area 28, and the other intermediate area 29b and the other side area 30b are cut in this order (hereinafter referred to as “cutting method 2” for convenience).

  In the cutting method 1, first, as shown in FIG. 1, the packaging container 10 is grasped with one hand, the center of the tip of the wrap film 14 is grasped with the other hand, and a desired amount is pulled out. Then, the thumb of the hand holding the packaging container 10 is applied to the central portion of the lid front wall 22, and the packaging container 10 is twisted forward, that is, in the direction of arrow A.

  At this time, the first large teeth 38a at the apex of the cutting blade 24a first contact the wrap film 14 and pierce it (FIG. 2). At the same time, the second large teeth 38b and further the third large teeth 38c contact the wrap film 14 and pierce it. In this way, since only the five large teeth 38 having a large interdental pitch and the highest tooth height are in contact with the wrap film 14 first, the force for twisting the packaging container 10 at the beginning of cutting is small. That is, since the minimum force required for each large tooth 38 to pierce the wrap film 14 is constant, a force that is approximately five times that force is the minimum force that twists the packaging container 10. When the tooth tip angle is reduced and the inter-tooth pitch is reduced as in the prior art, since the number of teeth in contact with the wrap film 14 is large, the force applied to the packaging container 10 is inevitably large. Although the feeling is also impaired, there is no such problem in the present embodiment.

  Subsequently, middle teeth 36 are in contact with the wrap film 14, and the wrap film 14 is penetrated by these middle teeth 36. Here, if it is assumed that there are no middle teeth 36, the pitch between the large teeth 38 is wide, so that the valleys (interdental) between the teeth 38 become resistance, and a large force is required to open the wrap film 14. Become. However, in this embodiment, since the middle teeth 36 penetrate the wrap film 14 between the large teeth 38 following the piercing of the wrap film 14 by the large teeth 38, the piercing of the wrap film 14 is facilitated. Although the maximum number of middle teeth 36 that are simultaneously in contact with the wrap film 14 is eight, the number of middle teeth 36 that are actually in contact with the wrap film 14 is actually less than eight. Therefore, the force required for the piercing by the middle teeth 36 is smaller than that for the piercing by the large teeth 38. In this way, the first-stage cutting by the large teeth 38 to the second-stage cutting by the middle teeth are smoothly performed without giving the user a sense of resistance.

  Further, when the packaging container 10 is twisted in the direction of arrow A, the small teeth 35 in the central area 28 pierce the wrap film 14 between the third and fourth middle teeth 36c, 36d, and the wrap film 14 is cut in the middle. Proceed to area 29. If a sufficiently large initial piercing portion is formed on the wrap film 14, then no particularly large force is required to cut the wrap film 14, and the intermediate first tooth 31 and the intermediate second tooth 32 are formed. In the side area 30 including the intermediate area 29 and the side teeth 33 and 34 (FIG. 5), the wrap film 14 is smoothly opened and cut.

  In the cutting method 2, as shown in FIG. 4, the packaging container 10 is grasped with one hand, the tip of the side of the wrap film 14 is grasped with the other hand, and a desired amount is pulled out. And while fixing the container with the hand holding the packaging container 10, the other hand pulls up the wrap film 14 upward, that is, in the direction of arrow B, so that one end of the wrap film 14 is one side of the cutting blade 24 a. Against the side area 30a.

  In this cutting method 2, only the large side large teeth 34 provided at the end of the cutting blade 24a contact the wrap film 14 at the beginning of cutting. Thus, compared with a cutting blade having only the same tooth height in the side area, the number of teeth contacting the wrap film at the beginning of cutting can be reduced, and the wrap film can be easily pierced.

  When the wrap film 14 is further pulled up in the arrow B direction, several side large teeth 34 belonging to the side area 30 and provided at the end of the cutting blade 24a pierce the wrap film 14 (FIG. 5). . Since the tooth tip of the side large tooth 34 faces outward from the other teeth 31 to 38, the tension direction of the wrap film 14 and the tooth tip direction can be matched, and the wrap film 14 can be made more easily. Can be stabbed. When the wrap film 14 is further pulled up in the direction of arrow B, several large side teeth 34 provided on the intermediate area 29a side in FIG. 4 come into contact with the wrap film 14 and pierce the wrap film 14. As a result, a sufficiently large initial protrusion is formed.

  Further, when the wrap film 14 is pulled up in the direction of arrow B, the cutting of the wrap film 14 shifts from the “piercing” stage to the “cutting” stage. That is, if a sufficiently large initial piercing portion is formed by the side large teeth 34, no particularly large force is required to cut the wrap film 14 thereafter, and the intermediate first teeth 31 and the intermediate second teeth The wrap film 14 is smoothly cut and opened by the intermediate area 24 composed of the teeth 32. Subsequently, the wrap film 14 is smoothly opened and cut also in the central area 28, the intermediate area 29b, and the side area 30b.

  That is, in the case of the cutting blade 24a, the wrap film can be easily cut from any of the V-shaped apex portion of the cutting blade 24a and one end portion of the cutting blade 24a, and the feeling at the time of cutting is also good. is there.

  A suitable total number of teeth, tooth height and interdental pitch in the central area 28 and the intermediate area 29a of the cutting blade 24a are the same as those in the first embodiment. The total number of teeth belonging to one side area 30a is preferably 1 to 150, more preferably 5 to 100, and even more preferably 10 to 50. When the total number of teeth belonging to the side area 30a becomes excessive, as a result, the area of the side area 30a in the cutting blade 24a becomes large, and the good cutting property when cutting the wrap film by the cutting method 1 tends to be impaired. is there.

  The tooth height H2 of the side large teeth 34 in the side area 30a is preferably 0.8 to 2.0 mm, more preferably 0.9 to 1.5 mm, and the tooth height H3 of the side small teeth 33 is preferably 0.4 to 1.5 mm, more preferably 0.5 to 1.0 mm. The interdental pitch between the side large teeth 34 and the interdental pitch between the side small teeth 33 are preferably 1.0 to 3.5 mm, more preferably 1.5 to 3.0 mm. .

[Third embodiment]
FIG. 6 is a partially enlarged view of one side portion of the cutting blade according to the third embodiment of the present invention. The cutting blade 24b of FIG. 6 is different from the cutting blade 24 of the first embodiment in that the side area 30 includes side teeth 40. That is, the cutting blade 24b has the same tooth configuration as that of the cutting blade 24 of the above embodiment in the central area (not shown) and the intermediate area 29. The cutting blade 24a has the same tooth configuration as that of FIG. 6 in the other side area and the intermediate area.

  The side teeth 40 provided in the side area 30 of the cutting blade 24 b of this embodiment have the same shape as the intermediate first teeth 31 and the intermediate second teeth 32 belonging to the intermediate area 29. A straight line L5 that connects the tooth tips of the side teeth 40 is located between a straight line L1 that connects large teeth in the central area and a straight line L2 that connects middle teeth in the central area. Even if such side teeth 40 are provided, the effects of the present invention can be obtained. That is, the wrap film can be easily cut from either the V-shaped apex portion of the cutting blade 24b or one end portion of the cutting blade 24b, and the feeling during cutting is also good. Moreover, the cutting blade 24b provided with the side teeth 40 is further excellent in durability.

  The side teeth 40 have a tip angle equivalent to the tip angle α of the intermediate first tooth 31 and the intermediate second tooth 32. The shape of the side teeth 40 may be a simple isosceles triangle shape, but is preferably a divergent shape in which at least one of the hypotenuses has an arc shape recessed inward. Accordingly, the durability can be improved while maintaining the tooth tip angle α at an acute angle to some extent. Further, in the case of such a shape, the number of teeth can be reduced within the same length range as compared to the case where the hypotenuse is linear, which contributes to reduction of the force required for cutting.

  In the cutting blade 24b according to the present embodiment, the tip angles α of the small teeth 35, the middle teeth 36, the large teeth 38, the intermediate first teeth 31, the intermediate second teeth 32, and the side teeth 40 (FIGS. 2 and 2). 6) is an angle suitable for piercing the wrap film 14. In the present embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tooth tip angle α is preferably in the range of 30 ° to 90 °, more preferably 40 ° to 70 °. This is because if it is larger than 90 °, a great force is required to pierce the wrap film 14, and if it is smaller than 30 °, the durability of the teeth 31 to 40 itself tends to be impaired.

  The shapes of the small teeth 35, the middle teeth 36, the large teeth 38, the intermediate first teeth 31, the intermediate second teeth 32, and the side teeth 40 may be simple isosceles triangles, In the present embodiment, it is preferable that at least one of the hypotenuses has an arcuate shape recessed inward or a shape of a leaf of a ginkgo or a ginkgo leaf. This is to improve the durability while maintaining the tooth tip angle α at the above-mentioned acute angle. Further, in the case of such a shape, the number of teeth can be reduced within the same length range as compared to the case where the hypotenuse is linear, which contributes to reduction of the force required for cutting.

  Next, a method for cutting the wrap film 14 using the packaging container having the cutting blade 24b according to the present embodiment will be described with reference to the drawings. As a method of cutting the wrap film 14, there are two cutting methods shown in FIGS. FIG.1 and FIG.4 is a perspective view which shows the form of the packaging container 10 with which this invention was applied. The packaging container 10 shown in FIG.1 and FIG.4 comprises the cutting blade 24b which has the structure of the tooth | gear shown in FIG.2 and FIG.6 in both.

  In one cutting method (the method shown in FIG. 1), the wrap film 14 is first stabbed in the central area 28 including the V-shaped apex portion of the cutting blade 24b, and then the intermediate area 29 on both sides and the side area 30 on both sides. In this order, the pierced wrap film 14 is cut open (hereinafter referred to as “cutting method 1” for convenience). In the other cutting method (the method shown in FIG. 4), the wrap film 14 is first pierced in one side area 30a of the cutting blade 24b, and then one intermediate area 29a adjacent to the side area 30a, the central area 28, and the other intermediate area 29b and the other side area 30b are cut in this order (hereinafter referred to as “cutting method 2” for convenience).

  In the cutting method 1, first, as shown in FIG. 1, the packaging container 10 is grasped with one hand, the center of the tip of the wrap film 14 is grasped with the other hand, and a desired amount is pulled out. Then, the thumb of the hand holding the packaging container 10 is applied to the central portion of the lid front wall 22, and the packaging container 10 is twisted forward, that is, in the direction of arrow A.

  At this time, the first large teeth 38a at the apex of the cutting blade 24b first contact the wrap film 14 and pierce it (FIG. 2). At the same time, the second large teeth 38b and further the third large teeth 38c contact the wrap film 14 and pierce it. In this way, since only the five large teeth 38 having a large interdental pitch and the highest tooth height are in contact with the wrap film 14 first, the force for twisting the packaging container 10 at the beginning of cutting is small. That is, since the minimum force required for each large tooth 38 to pierce the wrap film 14 is constant, a force that is approximately five times that force is the minimum force that twists the packaging container 10. When the tooth tip angle is reduced and the inter-tooth pitch is reduced as in the prior art, since the number of teeth in contact with the wrap film 14 is large, the force applied to the packaging container 10 is inevitably large. Although the feeling is also impaired, there is no such problem in the present embodiment.

  Subsequently, middle teeth 36 are in contact with the wrap film 14, and the wrap film 14 is penetrated by these middle teeth 36. Here, if it is assumed that there are no middle teeth 36, the pitch between the large teeth 38 is wide, so that the valleys (interdental) between the teeth 38 become resistance, and a large force is required to open the wrap film 14. Become. However, in this embodiment, since the middle teeth 36 penetrate the wrap film 14 between the large teeth 38 following the piercing of the wrap film 14 by the large teeth 38, the piercing of the wrap film 14 is facilitated. Although the maximum number of middle teeth 36 that are simultaneously in contact with the wrap film 14 is eight, the number of middle teeth 36 that are actually in contact with the wrap film 14 is actually less than eight. Therefore, the force required for the piercing by the middle teeth 36 is smaller than that for the piercing by the large teeth 38. In this way, the first-stage cutting by the large teeth 38 to the second-stage cutting by the middle teeth are smoothly performed without giving the user a sense of resistance.

  Further, when the packaging container 10 is twisted in the direction of arrow A, the small teeth 35 in the central area 28 pierce the wrap film 14 between the third and fourth middle teeth 36c, 36d, and the wrap film 14 is cut in the middle. Proceed to area 29. If a sufficiently large initial piercing portion is formed on the wrap film 14, then no particularly large force is required to cut the wrap film 14, and the intermediate first tooth 31 and the intermediate second tooth 32 are formed. Also in the side area 30 consisting of the intermediate area 29 and the side teeth 40 (FIG. 6), the wrap film 14 is smoothly opened and cut.

  In the cutting method 2, as shown in FIG. 4, the packaging container 10 is grasped with one hand, the tip of the side of the wrap film 14 is grasped with the other hand, and a desired amount is pulled out. And while fixing the container with the hand holding the packaging container 10, the other hand pulls up the wrap film 14 in the upward direction, that is, the arrow B direction, so that one end of the wrap film 14 is one of the cutting blades 24 b. Against the side area 30b.

  In this cutting method 2, only the side teeth 40 provided at the end of the cutting blade 24b contact the wrap film at the beginning of cutting. For this reason, it becomes possible to pierce a wrap film easily.

  When the wrap film 14 is further pulled up in the direction of arrow B, several side teeth 40 belonging to the side area 30 and provided at the end of the cutting blade 24b pierce the wrap film 14 (FIG. 6). When the wrap film 14 is further pulled up in the direction of arrow B, several side teeth 40 provided on the intermediate area 29b side come into contact with the wrap film 14 and pierce the wrap film 14. As a result, a sufficiently large initial protrusion is formed.

  Further, when the wrap film 14 is pulled up in the direction of arrow B, the cutting of the wrap film 14 shifts from the “piercing” stage to the “cutting” stage. That is, if a sufficiently large initial piercing portion is formed by the side teeth 40, no particularly large force is required to cut the wrap film 14 thereafter, and the tooth height is lower than that of the side teeth 40. The wrap film 14 is smoothly cut and opened by the intermediate area 24b including the intermediate first teeth 31 and the intermediate second teeth 32. Subsequently, the wrap film 14 is smoothly opened and cut also in the central area 28, the intermediate area 29b, and the side area 30b.

  That is, in the case of the cutting blade 24b, the wrap film can be easily cut from any of the V-shaped apex portion of the cutting blade 24b and one end portion of the cutting blade 24b, and the feeling at the time of cutting is also good. is there.

  In the cutting blade 24b, the number of side teeth 40 provided in one side area 30 is preferably 5 to 100, more preferably 10 to 50, and 20 to 45. Is more preferable. When the number of side teeth 40 provided on one side tooth 30 is less than 20, in the cutting method of starting cutting of the wrap film from one side area 30 of the cutting blade 24b, an initial piercing portion of the wrap film Therefore, the smoothness of the transition from the “piercing” stage to the “cutting” stage tends to be impaired. When the number of side teeth 40 provided on one side tooth 30 exceeds 100, in the cutting method of starting cutting from the central area of the cutting blade 24b, good in the “opening” stage when cutting the wrap film There is a tendency for a bad feeling.

  The tooth height H4 of the side teeth 40 in the side area 30 is preferably 0.8 to 3.5 mm, more preferably 0.9 to 2.0 mm, and still more preferably 1.0 to 1.5 mm. Good. The interdental pitch of the side teeth 40 is preferably 0.5 to 3.5 mm, more preferably 0.7 to 2.5 mm.

[Modifications of First, Second, and Third Embodiments]
FIG. 7 is a partially enlarged view of the central portion of the cutting blade according to a modification of the first, second, and third embodiments of the present invention. The cutting blade 24c of FIG. 7 is different from the cutting blade 24 of the above embodiment in that only the side teeth 31 are provided in the intermediate area 29. That is, the cutting blade 24c has a tooth configuration similar to that of the cutting blade 24 according to the first embodiment in the central area 28 and the side area (not shown). A straight line L4 connecting the tooth tips of the side teeth 31 is located between a straight line L2 connecting the tooth tips of the middle teeth 36 in the central area 28 and a straight line L3 connecting a plurality of tooth bases. Even when the intermediate area 29 is composed of only the side teeth 31 having the same tooth height as in the cutting blade 24c, the effect of the present invention can be obtained and the wrap film is easily cut open. be able to.

  As mentioned above, although preferred embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to the said embodiment.

  In each of the above embodiments, the wrap film is made of polyvinylidene chloride, but the present invention can also be applied to wrap films made of other resins. In such a case, the tooth height, the interdental pitch, the tooth tip angle, and the like can be appropriately changed from the above dimensions.

  Further, the roll package may be not only a wrap film but also an aluminum foil or paper.

  In addition, examples of the material of the cutting blade in each of the above embodiments include vulcanized fiber, resin-impregnated paper, and resin, and among them, a resin that is excellent in strength is preferable. Examples of the resin used include polyester, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether ether ketone resin), PES (polyether sulfone resin) and the like. Of these, polyester is preferable, and polyethylene terephthalate is more preferable.

  It is also possible to use an environmentally friendly biodegradable resin among the resins. A biodegradable resin is a low molecular weight compound that is decomposed into low molecular weight compounds by the action of microorganisms that exist in nature when it is discarded after use, while maintaining the same functions as conventional resins during use. Since it has such a function, it can provide a cutting blade that is more environmentally friendly. Examples of biodegradable resins include polylactic acid resins and polyglycolic acid resins.

  The cutting blade according to each of the above embodiments can be formed using one of the above-described resin materials alone or a mixture of two or more. Further, an inorganic resin material such as calcium carbonate, titanium oxide, silica, barium sulfate, and talc is added to a single resin material or a resin material in which two or more kinds are mixed, in an amount of 5 to 70% by mass with respect to the entire cutting blade material. It can also be formed by adding. By adding inorganic powder, the mechanical strength can be improved.

  The cutting blade is a sheet having a thickness of 0.05 to 0.5 mm, preferably a thickness of 0.1 to 0.3 mm, more preferably a thickness of 0.20 to 0.28 mm. It can be formed by punching with a mold. In addition, when the thickness of the cutting blade exceeds 0.5 mm, there is a tendency that a sufficiently good cutting property cannot be obtained, and when the thickness of the cutting blade is less than 0.05 mm, a good sharpness tends to be impaired.

  FIG. 8 is a schematic cross-sectional view of a stacked portion of a packaging container in which a cutting blade according to an embodiment of the present invention is attached to the back surface of the front wall of the lid body through a sealant material that is a resin. In the laminated portion 50 of the packaging container, the sealant material 54, the adhesive layer 52, and the cutting blade 24 are laminated in this order on the back surface 22a of the front wall 22 of the lid. The cutting blade 24 bonded to the sealant material 54 having an ethylene methacrylic acid copolymer as a main component with a polyurethane adhesive (adhesive layer 52) is formed on the back surface 22a of the front wall of the sealant material 54 and the packaging container lid. Are attached to the back surface 22a of the front wall of the packaging container. Thus, the cutting blade 24 attached to the back surface 22a of the front wall of the packaging container lid through the sealant material 54 is fixed to the packaging container lid with a sufficient adhesive force, so that it can be easily removed from the packaging container lid. Does not peel.

  The method for attaching the cutting blade to the back surface of the front wall of the packaging container lid may be a known cold glue method or pressure sensitive adhesive method.

It is a perspective view which shows the form of the packaging container 10 with which this invention was applied. It is a partial enlarged view of the center part of the cutting blade concerning 1st embodiment of this invention. It is a partially expanded view of one side part in the cutting blade concerning 1st embodiment of this invention. It is a perspective view which shows the form of the packaging container 10 with which this invention was applied. It is a partial enlarged view of one side part in the cutting blade concerning 2nd embodiment of this invention. It is a partial enlarged view of one side part in the cutting blade concerning 3rd embodiment of this invention. It is a partial enlarged view of the center part of the cutting blade concerning the modification of 1st, 2nd, 3rd embodiment of this invention. It is a schematic cross section of the lamination | stacking part of the packaging container attached to the back surface of the front wall of a cover body through the sealant material whose cutting blade which concerns on one Embodiment of this invention is resin.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Packaging container, 12 ... Paper tube, 14 ... Wrap film, 16 ... Container body, 18 ... Cover body, 20 ... Top edge of rear wall of container body, 22 ... Front wall of lid body, 22a ... Back surface, 24, 24a, 24b, 24c ... cutting blade, 26 ... bottom of the front wall of the container body, 28 ... center area, 29, 29a ... intermediate area, 30, 30a, 30b ... side area, 31 ... intermediate first tooth (intermediate tooth) ), 32 ... Intermediate second tooth (intermediate tooth), 33 ... Side small tooth (side tooth), 34 ... Side large tooth (side tooth), 35 ... Small tooth, 36 ... Medium tooth (second tooth) ), 38 ... large teeth (first teeth), 39, 40 ... side teeth, 50 ... laminated portion, 52 ... adhesive layer, 54 ... sealant material.

Claims (9)

In a non-metallic V-shaped cutting blade provided with a plurality of teeth, which is attached to a packaging container containing a roll-shaped package and cuts the roll-shaped package,
It is divided into a central area including the V-shaped apex, a pair of side areas each including one of both ends of the V-shaped, and a pair of intermediate areas sandwiched between the pair of side areas and the central area. ,
The central area is
A plurality of first teeth having the highest tooth height and the same tooth height; and a plurality of second teeth having a lower tooth height and the same tooth height;
One of the first teeth is arranged at the vertex, and the other first teeth are arranged at a predetermined interval around the first tooth of the vertex,
The second teeth are disposed between the first teeth;
The first straight line connecting the tooth tips of the first tooth, the second straight line connecting the tooth tips of the second tooth, and the third straight line connecting the tooth bases of the first tooth and the second tooth are parallel to each other, The second straight line is located between the first straight line and the third straight line,
The intermediate area is
A plurality of intermediate teeth, and the tip of the intermediate teeth is located on the second straight line or between the second straight line and the third straight line;
The side area is
Cutting for packaging containers, having a plurality of side teeth, wherein the tooth tips of the side teeth are located on the second straight line or between the first straight line and the second straight line. blade.   The packaging container according to claim 1, wherein at least one tooth tip of the plurality of side teeth faces outward from the tooth tips of the first tooth, the second tooth, and the intermediate tooth. Cutting blade.   The cutting for packaging containers according to claim 1 or 2, wherein a tooth height of the side teeth is the same as or higher than the second teeth and lower than the first teeth. blade. In a non-metallic V-shaped cutting blade provided with a plurality of teeth, which is attached to a packaging container containing a roll-shaped package and cuts the roll-shaped package,
It is divided into a central area including the V-shaped apex, a pair of side areas each including one of both ends of the V-shaped, and a pair of intermediate areas sandwiched between the pair of side areas and the central area. ,
The central area is
A plurality of first teeth having the highest tooth height and the same tooth height; and a plurality of second teeth having a lower tooth height and the same tooth height;
One of the first teeth is arranged at the vertex, and the other first teeth are arranged at a predetermined interval around the first tooth of the vertex,
The second teeth are disposed between the first teeth;
The first straight line connecting the tooth tips of the first tooth, the second straight line connecting the tooth tips of the second tooth, and the third straight line connecting the tooth bases of the first tooth and the second tooth are parallel to each other, The second straight line is located between the first straight line and the third straight line,
The intermediate area is
A plurality of intermediate teeth, and the tip of the intermediate teeth is located on the second straight line or between the second straight line and the third straight line;
The side area is
It has a plurality of side teeth, and at least one tooth tip of the plurality of side teeth faces outside than the tooth tips of the first tooth, the second tooth and the intermediate tooth. Cutting blade for packaging containers.   The cutting blade for a packaging container according to any one of claims 1 to 4, wherein the intermediate area has two kinds of intermediate teeth with different tooth heights arranged alternately.   The cutting blade for a packaging container according to any one of claims 1 to 5, wherein a tooth height of the intermediate tooth is the same as or lower than that of the second tooth.   The hypotenuse of at least one of the first teeth, the second teeth, the intermediate teeth, and the side teeth has an arc shape that is recessed inward. The cutting blade for packaging containers as described in 2.   The packaging container which comprises the cutting blade described in any one of claims 1 to 7 on the back surface of the front wall of the lid. The packaging container according to claim 8, wherein the cutting blade is attached to the back surface of the front wall of the lid through a modified polyethylene resin.

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