JP5476428B2 - Cutting blade for packaging container and packaging container having the same - Google Patents

Description

  The present invention relates to a packaging container for packaging a wrap film wound in a roll shape on a cylindrical core, and more particularly to 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 this type of cutting blade, a V-shaped shape in which the middle portion of the cutting blade is closer to the bottom of the container than the side area is used instead of a linear shape so that the film can be easily cut. Is used. This is a shape for reliably and easily cutting by starting to cut the wrap film from the most protruding portion of the cutting blade.

  Moreover, although the metal cutting blade is generally used, a non-metal cutting blade made of paper or resin has been studied in consideration of recent environmental problems.

  However, it is difficult for non-metal cutting blades to exhibit as good cutting performance as metal cutting blades, and it is particularly powerful for cutting films such as polyethylene, polypropylene, and polyvinylidene chloride that are highly stretchable. Therefore, there are cases where the container and teeth are damaged as they are used, resulting in inconvenience in use. In order to improve this point, for example, as disclosed in Patent Documents 1 to 4 below, the teeth in the central area of the cutting blade are made larger than the teeth in the area on the side, or conversely Attempts have been made to improve cutting performance by making the teeth in the central area smaller than the side areas or sharpening the tips of the teeth.

JP 2006-21292 A Registered Utility Model No. 2547868 Japanese Utility Model Publication No. 7-11527 JP 2006-188285 A

  However, according to the study by the present inventors, the cutting blade of Patent Document 1 described above sharpens the tip of each tooth of the paper saw blade, but since the size of each tooth is all the same, the cutting blade is cut. There is a problem with sex. In addition, since the cutting blades of Patent Documents 2 and 3 described above have considerably large teeth in the central area compared to the side area, there is a problem in durability and feeling (functionality) during cutting. There is. In addition, the cutting blade of Patent Document 4 described above is provided with a switching blade peak between a small blade peak disposed at the center and a large blade peak disposed at both ends. The ring (functionality) is still not sufficient. Under such circumstances, a non-metallic cutting blade with improved cutting performance is desired.

  Therefore, a first object of the present invention is to provide a non-metallic cutting blade capable of easily and reliably cutting a roll-shaped package such as a wrap film. The second object of the present invention is to provide a packaging container provided with such a non-metallic cutting blade.

  As a result of diligent research to achieve the above objectives, the cutting performance of wrap film, etc. is closely related to the dimensions of the teeth that make up the V-shaped cutting blade, tooth tip angle, inter-tooth pitch, tooth shape, etc. And found that it affects.

The present invention has been made based on such knowledge, and the cutting blade of the present invention was attached to the back surface of the front wall of the lid in a packaging container for packaging a roll-shaped package such as a wrap film. In a V-shaped cutting blade made of nonmetal,
(A) It is composed of a central area and side areas arranged on both sides of the central area,
(B) the central area includes a plurality of first teeth and a plurality of second teeth smaller than the first teeth;
(C) One of the first teeth is arranged at the apex portion of the V-shape of the central area, and the other first teeth are arranged at a predetermined interval so as to sandwich the first tooth of the apex portion,
(D) the second teeth are disposed between the first teeth;
(E) The first straight line connecting the tip of the other first tooth in the central area and the tip of the first tooth of the apex is more than the tip of the second tooth in the central area. Located away from the front wall of the lid,
(F) the side area comprises a plurality of side teeth;
(G) A second straight line that is parallel to the first straight line and connects the tooth tips of the second teeth passes through the tooth tips of the side teeth in the side area, or the tooth tips of the side teeth. Rather than being located away from the front wall of the lid.

  By providing the central area having the above-described configuration, the cutting of the wrap film or the like, which is a medium, is divided into two stages, a “piercing” stage at the beginning of cutting by the central area and a “cutting” stage by the side area thereafter. . Furthermore, the “piercing” stage is divided into two steps, a piercing step with the first tooth and a piercing step with the second 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, only the first tooth requires a force to pierce the wrap film due to the resistance of the valley between the first teeth, but after the piercing with the first tooth, the second tooth penetrates the wrap film, so that smooth It becomes possible to pierce the wrap film.

  Moreover, it is preferable that a side part area is equipped with 2 types of large and small side teeth arrange | positioned alternately.

  In this way, the side teeth that are in contact with the wrap film at the same time in the transition from the “piercing” stage to the “opening” stage and the “opening” stage are arranged by alternately arranging the large and small side teeth in the side area. The number of can be reduced. Therefore, the transition from the “piercing” stage to the “cut-opening” stage is smoother and the wrap film can be cut open and cut with a smaller force than when multiple side teeth with a single dimension are provided. It becomes.

  Moreover, it is preferable that the cutting blade of this invention contains a tooth | gear larger than the side part tooth | gear in parts other than the edge part outside the side part area in the edge part outside the side part area.

  Even when cutting the wrap film is started from the end of the wrap film by arranging teeth larger than the side teeth in other parts of the side area at the outer end portion of the side area, Film cutting is divided into two stages, a “piercing” stage and a “cutting” stage. At the beginning of cutting, the only teeth that come into contact with the wrap film are the large teeth arranged at the outer end of the side area, so that the force required for piercing is small. Therefore, the wrap film can be easily cut both in the case where the cutting of the wrap film is started from the end portion of the wrap film and in the case where the cutting is started from the center portion of the wrap film.

  The side teeth are preferably the same size as the second teeth or smaller than the second teeth. This is because after the cutting with the second teeth, the wrap film can be cut open and cut with the side teeth without particularly applying force, and a good feeling of use can be obtained with relatively small teeth.

  In the present invention, the hypotenuse of at least one of the first tooth, the second tooth, and the side teeth has an arc shape recessed inward, that is, the shape of the tooth is a so-called ginkgo leaf shape.

  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 with a fixed length, 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 also be obtained.

  Further, examples of the non-metallic cutting blade include vulcanized fiber, resin-impregnated paper, and resin-made cutting blades, and among them, a resin-made one having excellent strength is preferable. Examples of the resin used include polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether-ether-ketone resin), PES (polyethersulfone resin), and the like. Furthermore, among the resins, environmentally friendly biodegradable resins are preferable. 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 of the present invention can be formed using one of the above-described resin materials alone or a mixture of two or more. Moreover, it forms by adding 5-70 mass% of inorganic powders, such as a calcium carbonate, a titanium oxide, a silica, to the resin material which mixed the single resin material or 2 or more types with respect to the whole material of a cutting blade. You can also By adding inorganic powder, the mechanical strength can be improved.

  The cutting blade of the present invention can be formed by punching with a mold after forming these materials into a sheet shape having a thickness of 0.05 to 0.5 mm, preferably 0.1 to 0.3 mm.

  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 the cutting blade of this invention and a packaging container provided with the same, when cutting a wrap film, big force is not required. Moreover, since the wrap film is stabbed in the first stage and continuously opened in the second stage, the load acting on each tooth of the cutting blade can be reduced, and even if the cutting blade is made of resin, The durability can be improved, and as a result, the durability of the packaging container itself can be improved.

  This effect reduces the necessity of excessively sharpening the tooth tip, and greatly contributes to the improvement of the durability of the tooth itself.

It is a perspective view which shows the form of the packaging container 10 with which this invention was applied. It is an enlarged view of the center part of the resin-made cutting blade concerning 1st embodiment of this invention. It is an enlarged view of the center part of the resin-made cutting blade concerning 2nd embodiment of this invention. It is a partial enlarged view of the side part area of the one side of the resin-made cutting blade concerning 2nd embodiment of this invention. It is a partial enlarged view of the side part area of the one side of the resin-made cutting blade concerning 3rd embodiment of this invention. It is a partial enlarged view of the edge part of the one side area in the cutting blade concerning the modification of 1st, 2nd or 3rd embodiment. It is an enlarged view of the center part of the resin-made cutting blade concerning another embodiment of this invention. It is a schematic diagram (longitudinal sectional view) showing a clerap cutting force measuring machine and a measuring method. It is an enlarged view of the center area of the cutting blade which provided five large teeth in the center area. It is an enlarged view of the center area of the cutting blade which provided seven large teeth in the center area. It is an enlarged view of the central area of the cutting blade which provided seven large teeth and six middle teeth in the central area. It is an enlarged view of the central area of the cutting blade in which the shape of the teeth in the central area is an isosceles triangle and five large teeth are provided. It is the enlarged view of the center area of the cutting blade which made the tooth shape of the center area the isosceles triangle, and provided seven large teeth. It is the enlarged view of the central area of the cutting blade which made the tooth shape of the center area the isosceles triangle, and provided 11 large teeth. It is an enlarged view of the central area of the cutting blade in which the tooth shape in the central area is an isosceles triangle and the tip angle of the large tooth in the central area is 80 °. It is an enlarged view of the center area of the cutting blade which made the tooth shape of the center area the isosceles triangle, and made the size of the tooth small. It is a line graph which shows transition of the rotational force with respect to the rotation angle of the packaging container of Example 5 in the cutting property test 3. FIG. It is a line graph which shows transition of the rotational force with respect to the rotation angle of the packaging container of Example 6 in the cutting property test 3. FIG. It is a line graph which shows transition of the rotational force with respect to the rotation angle of the packaging container of Example 7 in the cutting property test 3. FIG. It is a bar graph which shows the average score of the evaluation score of the functionality test 2 by group 1. In the sensory test 2 by group 2, it is a bar graph showing the number of monitors with the highest evaluation score among the three types of packaging containers.

[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. When the wrap film 14 is cut using the packaging container 10 employing such a V-shaped cutting blade 24, as shown in FIG. 1, the tip of the wrap film 14 is held with one hand and the other hand is used. While grasping the packaging container 10, the thumb of the hand is applied to the central portion of the front wall 22 of the lid body, and the packaging container 10 is twisted in the front side, that is, in the direction of arrow A. Thereby, if the teeth in the central area of the V-shaped cutting blade 24 penetrate the wrap film 14 and pull the wrap film 14 as it is, the wrap film 14 is cut open and cut.

  Next, the cutting blade 24 according to the present embodiment will be described in more detail.

  FIG. 2 is an enlarged view of a central portion of the resin cutting blade according to the first embodiment of the present invention. The cutting blade 24 is made of a resin, and in this embodiment, a biodegradable resin is employed in order to particularly consider the environment. Typical biodegradable resins include polylactic acid and polyglycolic acid. Among them, in the present invention, a bilactically stretched polylactic acid resin composition disclosed in Japanese Patent No. 3573605 is preferably used. More specifically, the cutting blade 24 can be obtained by molding teeth having the shape disclosed in the present invention from a sheet obtained by biaxially stretching a polylactic acid resin composition by press working or laser cutting. it can. In addition to the inorganic filler disclosed in Japanese Patent No. 3573605, components other than the resin may include a thermal stabilizer, a light stabilizer, a moisture-proofing agent, a waterproofing agent, a release agent, a pigment, a dye, and the like. It doesn't matter.

  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 side areas 30 located on both sides thereof. It is divided into three areas.

  The teeth (side teeth) 31 in the side area 30 have a fixed size, and are relatively small as long as the teeth generally used conventionally. Hereinafter, a tooth having this dimension is referred to as a “small tooth”.

  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 are small teeth 35 having the same dimensions as the side teeth 31 in the side area 30, teeth larger than the small teeth 35 (second teeth: hereinafter referred to as “medium teeth”) 36, and medium teeth 36. There are three types of teeth (first teeth: hereinafter referred to as “large teeth”) 38. In the following description, alphabetic suffixes are appropriately added to the reference numerals 36 and 38 for the middle teeth and the large teeth.

  One of the large teeth 38 is located at the vertex of the V-shape of the cutting blade 24 (the longitudinal center of the central area 28), and the other large teeth 38b and 38c are 2 left and right with the central large tooth 38a as the center. The books are arranged 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) L <b> 1 is located on the front side (the side away from the tip edge of the lid front wall 22) than the tooth tips of the middle teeth 36 on the left and right sides of the central area 28.

  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.

  Further, a straight line (third straight line) L3 connecting the tooth tips of the side teeth 31 in the left and right side areas 30 is substantially parallel to the straight lines L1 and L2 on the same side, and the straight line L1 and It is located on the rear side (side closer to the leading edge of the lid front wall 22) than L2. That is, the straight line L2 on each of the left and right sides extends between the straight lines L1 and L3.

  Further, the small teeth 35 in the central area 28 are arranged between the third and fourth middle teeth 36 c and 36 d on the left and right sides, and the tooth tips thereof are the side teeth of the side area 30. It is located on the extension line of the straight line L3 connecting the 31 tooth tips.

  In the cutting blade 24 according to the present embodiment, the tooth tip angles α (FIG. 2) of the small teeth 35, medium teeth 36, large teeth 38, and side teeth 31 are angles suitable for piercing the wrap film 14. ing. 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 °. If the angle is larger than 90 °, a great amount of 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 is impaired.

  Each of the small teeth 35, the middle teeth 36, the large teeth 38, and the side teeth 31 may have a simple isosceles triangle shape. It is preferable to have a divergent shape or a ginkgo leaf shape. This is to improve the durability while maintaining the tooth tip angle α at the above-mentioned acute angle. Moreover, when it is set as this shape, the number of teeth can be decreased within the same length range as compared with the isosceles triangle, and it contributes to the reduction of the force required for cutting as described later.

  Next, the case where the wrap film 14 is cut | disconnected using the packaging container 10 which has the cutting blade 24 concerning this embodiment is demonstrated.

  First, as shown in FIG. 1, the packaging container 10 is grasped with one hand, the tip of the wrap film 14 is grasped with the other hand, and the 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. At the same time, the second large teeth 38b and further the third large teeth 38c contact the wrap film 14 and pierce it. As described above, since only the maximum five large teeth 38 having a large interdental pitch 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, only five times the force is the minimum force for twisting 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 a trough between the teeth 38 becomes a resistance, and a large force is required to open the wrap film 14. 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 opened side by side. Continue to the club area 30. If a sufficiently large initial pierced portion is formed on the wrap film 14, then no particularly large force is required to cut the wrap film 14, and the side area 30 including the side teeth 31 is smooth. The wrap film 14 is cut open and cut.

  When the cutting blade 24 according to the present embodiment is used, when the wrap film 14 is cut, no particularly large force is required, and this excessively reduces the tooth tip angle α of each tooth 31, 35, 36, 38. This reduces the necessity, and eventually improves the durability of each tooth 31, 35, 36, 38.

  In addition, when the tooth height (projection amount) of the large teeth 38 and the middle teeth 36 is excessively increased, the distance from the fixing portion of the cutting blade 24, that is, the distance from the front end edge of the lid front wall 22 is increased, and durability is increased. There is a risk that the sex will 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. More preferably, the tooth height H2 of the middle teeth 36 is preferably 1.0 to 3.0 mm, more preferably 1.2 to 2.5 mm, and the tooth height H3 of the small teeth 35 is , Preferably 0.5 to 2.5 mm, more preferably 0.6 to 2.0 mm.

  The interdental pitch of the central area 28 is preferably between 3.0 and 9.0 mm, more preferably between 4.0 and 7.0 mm, and even more preferably between 4.5 and 6.0 mm between the large teeth 38. The distance between 36 is preferably 3.0 to 9.0 mm, more preferably 4.0 to 7.0 mm, and still more preferably 4.5 to 6.0 mm. When the interdental pitch exceeds 9.0 mm, the film 14 is caught in the valleys between the large teeth 38 at the first stage of piercing of the wrap film 14, which causes a hindrance to cutting, and the interdental pitch is 3.0 mm. If the width is narrower, the number of teeth provided in the central area 28 increases, and as a result, the force required for piercing increases and the object of the present invention cannot be achieved.

  The tooth height H3 of the side teeth 31 of the side area 30 is preferably 0.3 to 2.5 mm, more preferably about 0.5 to 2.0 mm. The interdental pitch of the side teeth 31 is preferably 1.0 to 3.2 mm, more preferably 1.2 to 2.5 mm.

[Second Embodiment]
FIG. 3 is an enlarged view of the central portion of the resin-made cutting blade according to the second embodiment of the present invention. The cutting blade 24 according to the second embodiment has the same tooth configuration in the central area 28 as the central area 28 of the cutting blade 24 according to the first embodiment. However, the cutting blade 24 according to the second embodiment is different from the cutting blade 24 according to the first embodiment in that the side area 30 includes two kinds of large and small side teeth having different sizes. Yes.

  FIG. 4 is a partially enlarged view of a side area on one side of the resin-made cutting blade according to the second embodiment of the present invention. The cutting blade 24 in FIG. 4 is sandwiched between a plurality of side teeth (hereinafter referred to as “side first teeth”) 31 having the same dimensions as the small teeth 35 and the side first teeth 31 in the side area 30. As shown, the side teeth 32 (hereinafter referred to as “side second teeth”) 32 smaller than the side first teeth 31 are provided. In the side area 30, the side first teeth 31 are arranged so as to be adjacent to the middle blade 36 d belonging to the central area 28, and the side second teeth 32 and the side first teeth 31 are in the longitudinal direction of the cutting blade 24. Are alternately arranged at regular intervals. In FIG. 4, only five side teeth are shown for convenience, but actually, the side first teeth 31 and the side second teeth 32 are alternately provided up to the end of the cutting blade 24. 4 shows only one side area of the cutting blade 24, the cutting blade 24 has a similar tooth configuration symmetrically in the other side area.

  The tips of the plurality of side first teeth 31 arranged in the side area 30 and the tips of the small teeth 35 of the central area 28 can be connected with a straight line, and this straight line (third straight line) L3 is It is substantially parallel to the straight line L1 that connects the tooth tips of the large teeth and the straight line L2 that connects the tooth tips of the middle teeth, and is behind the straight lines L1 and L2 (the side closer to the tip edge of the lid front wall 22) ).

  Further, the tooth tips of the plurality of side second teeth 32 can be connected by a straight line, and this straight line (fourth straight line) L4 is substantially parallel to the straight lines L1, L2, and L3, and the straight line. It is located behind L1, L2 and L3 (side closer to the leading edge of the lid front wall 22).

  In the cutting blade 24 according to the present embodiment, each tooth tip angle α (FIG. 3) of the small teeth 35, the middle teeth 36, the large teeth 38, the side first teeth 31, and the side second teeth 32 is a wrap film. The angle is suitable for 14 stabs. 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 °. If the angle is larger than 90 °, a great amount of 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 is impaired.

  Each of the small teeth 35, the middle teeth 36, the large teeth 38, the side first teeth 31 and the side second teeth 32 may be a simple isosceles triangle, but in this embodiment, It is preferable to have a divergent shape or a ginkgo leaf shape in which the hypotenuse has an arc shape recessed inward. This is to improve the durability while maintaining the tooth tip angle α at the above-mentioned acute angle. Moreover, when it is set as such a shape, the number of teeth can be decreased within the same length range as compared with the isosceles triangle, which contributes to reduction of force required for cutting.

  Next, the case where the wrap film 14 is cut | disconnected using the packaging container 10 which has the cutting blade 24 concerning this embodiment is demonstrated.

  As in the first embodiment described above, first, as shown in FIG. 1, the packaging container 10 is grasped with one hand, 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. The cutting blade 24 according to the present embodiment has a tooth configuration similar to that of the central area of the cutting blade according to the first embodiment described above in the central area 28. Therefore, as in the first embodiment, a sufficiently large initial piercing portion is easily formed in the wrap film 14.

  The cutting blade 24 according to the present embodiment has a tooth configuration as shown in FIG. 4 in the side area. Therefore, after the piercing of the wrap film 14 is performed in the central area 28 of the cutting blade 24, several side first teeth 31 arranged closer to the central area 28 are in contact with the wrap film 14, “Cut” is started. After the “cutting” by the side first teeth 31 has progressed to some extent, the wrap film 14 contacts several side second teeth 32 arranged closer to the central area 28, and the wrap film 14 is cut open and cut. It will be done.

  If the cutting blade 24 according to this embodiment provided with two kinds of large and small side teeth (the side first teeth 31 and the side second teeth 32) having different dimensions in the side area as shown in FIG. 4 is used. , The number of side teeth that touch the wrap film 14 at the same time during the transition from the “piercing” stage to the “cutting” stage and the progress of the “cutting” stage, the force required for the transition from the piercing stage to the cutting stage; In addition, the force required for the progress of the slitting step can be further reduced.

  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 causes the tooth tip angle α of each tooth 31, 32, 35, 36, 38 to be excessive. This reduces the necessity of reducing the size, and as a result, improves the durability of the teeth 31, 32, 35, 36, and 38.

  In addition, when the tooth height (projection amount) of the large teeth 38 and the middle teeth 36 is excessively increased, the distance from the fixing portion of the cutting blade 24, that is, the distance from the front end edge of the lid front wall 22 is increased, and durability is increased. There is a risk that the sex will 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. More preferably, the tooth height H2 of the middle teeth 36 is preferably 1.0 to 3.0 mm, more preferably 1.2 to 2.5 mm, and the tooth height H3 of the small teeth 35 is , Preferably 0.5 to 2.5 mm, more preferably 0.6 to 2.0 mm.

  The interdental pitch of the central area 28 is preferably between 3.0 and 9.0 mm, more preferably between 4.0 and 7.0 mm, and even more preferably between 4.5 and 6.0 mm between the large teeth 38 and between the middle teeth. Is preferably 3.0 to 9.0 mm, more preferably 4.0 to 7.0 mm, and even more preferably 4.5 to 6.0 mm. When the interdental pitch exceeds 9.0 mm, the film 14 is caught in the valleys between the large teeth 38 at the first stage of piercing of the wrap film 14, which causes a hindrance to cutting, and the interdental pitch is 3.0 mm. If the width is narrower, the number of teeth provided in the central area 28 increases, and as a result, the force required for piercing increases and the object of the present invention cannot be achieved.

  The tooth height H3 of the side first teeth 31 in the side area 30 is preferably 0.3 to 2.5 mm, more preferably 0.5 to 2.0 mm. Further, the tooth height H4 of the side second teeth 32 is preferably 0.3 to 1.5 mm, more preferably about 0.5 to 1.2 mm. The inter-tooth pitch between the side first teeth 31 and the side teeth 2 teeth 32 is preferably 1.0 to 3.5 mm, more preferably 1.2 to 3.0 mm. When the cutting blade 24 has such a tooth configuration in the side area 30, the wrap film can be cut open more smoothly.

[Third embodiment]
FIG. 5 is a partially enlarged view of a side area on one side of a resin cutting blade according to a third embodiment of the present invention. Although not shown, the cutting blade 24 of FIG. 5 has a tooth configuration similar to that of the central area 28 of the cutting blade 24 according to the first and second embodiments in the central area 28. However, the cutting blade 24 of FIG. 5 is sandwiched between the side teeth 33 (hereinafter referred to as “side third teeth”) 33 and the side third teeth 33 smaller than the small teeth 35 in the side area 30. The cutting blade 24 according to the first and second embodiments in that it has a plurality of side teeth (hereinafter referred to as “side portion fourth teeth”) 34 that are larger than the small teeth 35 and smaller than the middle teeth 36. Is different. In the side area 30, the side third teeth 33 are arranged so as to be adjacent to the middle blade 36 d belonging to the central area 28, and the side third teeth 33 and the side fourth teeth 34 are in the longitudinal direction of the cutting blade 24. Are alternately arranged. In FIG. 5, only four side teeth are shown for convenience, but actually, the side third teeth 33 and the side fourth teeth 34 are alternately provided up to the end of the cutting blade 24. 5 shows only one side area of the cutting blade 24, the cutting blade 24 has a similar tooth configuration symmetrically in the other side area.

  The tooth tips of the plurality of side fourth teeth 34 arranged in the side area 30 can be connected by a straight line, and this straight line (fifth straight line) L5 is a straight line L1 connecting the tooth tips of the large tooth and the middle tooth Is substantially parallel to L2 connecting the tooth tips and is located on the rear side (side closer to the leading edge of the lid body front wall 22) than the straight lines L1 and L2.

  Further, the tooth tips of the plurality of side third teeth 33 can be connected by a straight line, and this straight line (sixth straight line) L6 is substantially parallel to the straight lines L1, L2 and L5, and It is located behind the straight lines L1, L2 and L5 (the side closer to the leading edge of the lid front wall 22). The tooth tips of the small teeth 35 in the central area are located between the straight lines L5 and L6.

  In the cutting blade 24 according to the present embodiment, each tooth tip angle α (FIG. 5) of the small teeth 35, the middle teeth 36, the large teeth 38, the side third teeth 33, and the side fourth teeth 34 is a wrap film. The angle is suitable for 14 stabs. 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 °. If the angle 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 33 to 38 itself is impaired.

  The shapes of the small teeth 35, the middle teeth 36, the large teeth 38, the side third teeth 33, and the side fourth teeth 34 may be simple isosceles triangles, but in this embodiment, It is preferable to have a divergent shape or a ginkgo leaf shape in which the hypotenuse has an arc shape recessed inward. This is to improve the durability while maintaining the tooth tip angle α at the above-mentioned acute angle. Moreover, when it is set as such a shape, the number of teeth can be decreased within the same length range as compared with the isosceles triangle, which contributes to reduction of force required for cutting.

  Next, the case where the wrap film 14 is cut | disconnected using the packaging container 10 which has the cutting blade 24 concerning this embodiment is demonstrated.

  As in the first embodiment described above, first, as shown in FIG. 1, the packaging container 10 is grasped with one hand, 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. The cutting blade 24 according to the present embodiment has a tooth configuration similar to that of the central area of the cutting blade according to the first embodiment described above in the central area 28. Therefore, as in the first embodiment, a sufficiently large initial piercing portion is easily formed in the wrap film 14.

  The cutting blade 24 according to the present embodiment has a tooth configuration as shown in FIG. 5 in the side area. Therefore, following the “piercing” of the wrap film 14 in the central area 28 of the cutting blade 24, several side fourth teeth 34 arranged closer to the central area 28 are in contact with the wrap film 14, ”. After the “cutting” by the side fourth teeth 34 has progressed to some extent, the wrap film 14 contacts several side third teeth 33 arranged closer to the central area 28, and the wrap film 14 is cut open and cut. It will be done.

  As shown in FIG. 5, if the cutting blade 24 having the side fourth teeth 34 larger than the small teeth 35 is used, the transition from the “piercing” stage to the “cutting” stage can be made smoother. In addition, since the side area 30 is provided with two kinds of side teeth (a side third tooth 33 and a side fourth tooth 34) having different sizes, the wrap film 14 is simultaneously provided in the “cut open” stage. The number of side teeth that come into contact with each other is reduced, and the force required for the progress of the “opening” can be further reduced.

  When the cutting blade 24 according to the above-described 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 of each tooth 33, 34, 35, 36, 38 is determined. This reduces the need to make it excessively small, and as a result, improves the durability of the teeth 33, 34, 35, 36, and 38.

  In addition, when the tooth height (projection amount) of the large teeth 38 and the middle teeth 36 is excessively increased, the distance from the fixing portion of the cutting blade 24, that is, the distance from the front end edge of the lid front wall 22 is increased, and durability is increased. There is a risk that the sex will 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. More preferably, the tooth height H2 of the middle teeth 36 is preferably 1.0 to 3.0 mm, more preferably 1.2 to 2.5 mm, and the tooth height H3 of the small teeth 35 is , Preferably 0.5 to 2.5 mm, more preferably 0.6 to 2.0 mm.

  The interdental pitch of the central area 28 is preferably between 3.0 and 9.0 mm, more preferably between 4.0 and 7.0 mm, and even more preferably between 4.5 and 6.0 mm between the large teeth 38 and between the middle teeth. Is preferably 3.0 to 9.0 mm, more preferably 4.0 to 7.0 mm, and even more preferably 4.5 to 6.0 mm. When the interdental pitch exceeds 9.0 mm, the film 14 is caught in the valleys between the large teeth 38 at the first stage of piercing of the wrap film 14, which causes a hindrance to cutting, and the interdental pitch is 3.0 mm. If the width is narrower, the number of teeth provided in the central area 28 increases, and as a result, the force required for piercing increases and the object of the present invention cannot be achieved.

  The tooth height H6 of the side third teeth 33 in the side area 30 is preferably 0.3 to 1.5 mm, more preferably about 0.5 to 1.2 mm. Further, the tooth height H5 of the side fourth teeth 34 is preferably 0.5 to 2.0 mm, more preferably about 1.7 to 1.8 mm. The inter-tooth pitch between the side third teeth 33 and the side teeth 4 teeth 34 is preferably 1.0 to 3.0 mm, and more preferably 1.5 to 2.5 mm. When the cutting blade 24 has such a tooth configuration in the side area 30, the wrap film can be cut open more smoothly.

[Modifications of First, Second, and Third Embodiments]
FIG. 6 is a partially enlarged view of an end portion of one side area of a cutting blade according to a modification of the first, second, or third embodiment. The cutting blade 24 of FIG. 6 includes teeth 39 larger than the side teeth at the outer end of the side area 30, that is, at both ends of the cutting blade 24, at portions other than the outer end of the side area 30. ing.

  Teeth 39 and side teeth (side first teeth 31) are alternately arranged at regular intervals in the longitudinal direction of the cutting blade 24 at the outer end of the side area 30. The tooth tips of the teeth 39 can be connected with a straight line, and this straight line L7 is substantially the same as the straight lines (for example, the straight lines L3 and L4) connecting the tooth tips of the side teeth arranged in other parts of the side area 30. And is located on the front side (the side away from the front edge of the lid front wall 22) from these straight lines. Although only one side area of the cutting blade 24 is shown in FIG. 6, the cutting blade 24 has a similar tooth configuration symmetrically in the other side area. The cutting blade 24 according to this embodiment includes two teeth 39 in each side area 24.

  With the cutting blade 24 having such a configuration, even when the wrap film is cut from the end, the “piercing” of the wrap film 14 is performed by the teeth 39 arranged at the outer end of the side area 30. Is called. After that, several side teeth arranged closer to the end of the side area 30 are in contact with the wrap film 14 and “cut-opening” proceeds. Thereby, the wrap film 14 is smoothly opened and cut.

  In addition, the tooth height H7 of the tooth 39 arranged at the outer end of the side area 30 is, for example, 1.0 to 4.0 mm, more preferably 1. from the viewpoint of cutability, durability, and safety. It is good to set it as about 2-2.5 mm. Moreover, the interdental pitch of the tooth | gear 39 arrange | positioned at the outer edge part of the side part area 30 is 3.0-9.0 mm, for example, Preferably it is 4.0-7.0 mm, More preferably, it is 4.5- It should be 6.5 mm. When the cutting blade 24 is provided with such a tooth configuration at the outer end of the side area 30, even when the wrap film is cut from the end of the wrap film, the wrap film is smoothly cut. be able to. The number of teeth 39 provided on the cutting blade 24 is preferably about 2 to 10.

  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.

  For example, FIG. 7 is an enlarged view of a central portion of a resin cutting blade according to another embodiment of the present invention. In the side area 30 of the cutting blade of FIG. 7, two kinds of large and small side teeth 31 and 37 having different sizes in the longitudinal direction are alternately provided. 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 side teeth 37 of the side area 30. Further, a straight line L3 that connects the tips of the small teeth 35 in the central area 28 and the tips of the side teeth 31 in the side area 30 is a straight line L1 that connects the tips of the large teeth 38 in the central area 28 and the straight line L2. And parallel to the straight lines L1 and L2, and located on the rear side (side closer to the front end edge of the lid front wall 22). Even when the cutting blade 24 as shown in FIG. 7 is used, as in the first, second and third embodiments described above, the wrap film has an initial pierced portion formed with a small force at the center thereof. After that, it is smoothly cut and easily cut.

  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 number of teeth constituting the central area may be more or less than that of each of the above embodiments, but it is an essential condition that the wrap film is configured to contact the teeth in two or more stages.

  Furthermore, the roll-shaped packaged object may be not only a wrap film but also an aluminum foil or paper.

  The cutting blade is preferably a biodegradable resin in each of the above embodiments, but other resins may be used, and the present invention can be applied to non-metals other than resin, such as vulcanized fiber and resin-impregnated paper. Is possible.

  Next, the cutting ability of the wrap film was evaluated as follows for the cutting blade manufactured according to the present invention. It should be noted that the present invention was invented after the cutting blades shown in the following Comparative Examples 1 to 8 were prototyped, intensively studied, and evaluated.

<Cutability test 1>
In this test, a biodegradable resin sheet (product name: Lacia LACEA TOF-250 manufactured by Mitsui Chemicals, Inc.) having different tooth composition, tooth height, interdental pitch, tooth shape and tip angle in the central area. Nine types of cutting blades with a thickness of 0.25 mm were prepared. The structure of the teeth in the central area of each cutting blade is as shown in Table 1. In addition, the side area of each cutting blade is provided with a conventional small tooth as shown in FIG. Each cutting blade is a packaging container (made of coated cardboard having a length of about 31 cm, a width of 4.5 cm, and a height of 4.5 cm) used in the registered trademark “NEW Kurelap” manufactured and sold by Kureha Co., Ltd. To the container). And the wrap film of the polyvinylidene chloride accommodated in this packaging container was actually cut | disconnected.

  The cutting force was measured using a measuring machine as shown in FIG. FIG. 8 is a schematic diagram (longitudinal sectional view) showing a clerap cutting force measuring machine and a measuring method. This measuring method will be described below. First, the packaging container 10 is placed on the carton set base of the measuring instrument, and the wrap film 14 pulled out from the packaging container 10 is fixed to the fixing jig 42 of the measuring instrument provided with the push-pull gauge 40 (FIG. 8). (A)). Next, while fixing the lid 18 so as not to be separated from the packaging container 10, the packaging container 10 is rotated in the direction of arrow B at a rotation speed of 90 ° per second around the axis P of the paper tube 12 of the wrap film. Rotate (FIG. 8B). As a result, the wrap film 14 is pressed against the cutting blade 24. A rotational force necessary for the wrap film 14 to be cut by the cutting blade 24 is measured by a push-pull gauge 40. The maximum value of the rotational force when cutting the wrap film 14 was measured as the cutting force. Table 1 shows the measured cutting force.

Example 1
Measurement was performed using a packaging container having a cutting blade shown in FIG. The cutting force was 330 g, which showed the best cutting performance among the measured biodegradable resin cutting blades.

(Comparative Example 1)
FIG. 9 is an enlarged view of the central area of the cutting blade in which five large teeth are provided in the central area. Cutting force was measured using the packaging container provided with this cutting blade. Since the piercing process of the wrap film at the beginning of cutting is one stage and the pitch at the time of piercing with large teeth is smaller than that in Example 1, a larger cutting force than that in Example 1 was required.

(Comparative Example 2)
FIG. 10 is an enlarged view of the central area of the cutting blade in which seven large teeth are provided in the central area. Cutting force was measured using the packaging container provided with this cutting blade. Similar to Comparative Example 1, the piercing process of the film at the beginning of cutting is one stage, and the pitch at the time of piercing with large teeth is smaller than that of Example 1, so that a larger cutting force than that of Example 1 was required.

(Comparative Example 3)
FIG. 11 is an enlarged view of the central area of a cutting blade in which seven large teeth and six medium teeth are provided in the central area. In order to smoothly cut from the central area to the side area where cutting force was measured using a packaging container equipped with this cutting blade, teeth with different tooth heights were not placed alternately, but large teeth in the center. In the process of piercing the film at the beginning of cutting, the pitch at the time of piercing with large teeth is smaller than that in Example 1, so that a larger cutting force than that in Example 1 was required. . Thus, it can be seen that the effect of reducing the cutting force cannot be obtained by simply arranging the large teeth and the middle teeth.

(Comparative Example 4)
FIG. 12 is an enlarged view of the central area of the cutting blade in which the shape of the teeth in the central area is an isosceles triangle and five large teeth are provided. Cutting force was measured using the packaging container provided with this cutting blade. Compared with Comparative Example 1 in which the number of large teeth in the central area is five, the interdental pitch becomes narrower, so that a larger cutting force than Comparative Example 1 was required.

(Comparative Example 5)
FIG. 13 is an enlarged view of the central area of the cutting blade in which the shape of the teeth in the central area is an isosceles triangle and seven large teeth are provided. Cutting force was measured using the packaging container provided with this cutting blade. Since the interdental pitch is narrower than that of Comparative Example 2 in which the number of teeth in the central area is 7 in common, a cutting force greater than that of Comparative Example 1 was required.

(Comparative Example 6)
FIG. 14 is an enlarged view of the central area of the cutting blade in which the teeth of the central area have an isosceles triangle and 11 large teeth are provided. Cutting force was measured using the packaging container provided with this cutting blade. The size of the central area is the same as that of Comparative Example 2, but since the number of teeth increased compared to Comparative Example 2, a large force was required to pierce the wrap film at the beginning of cutting, so the necessary cutting force was Comparative Example It was even larger than 2.

(Comparative Example 7)
FIG. 15 is an enlarged view of the central area of the cutting blade in which the tooth shape in the central area is an isosceles triangle and the tooth tip angle of the large tooth in the central area is 80 °. Cutting force was measured using the packaging container provided with this cutting blade. A considerably larger cutting force was required than in Comparative Example 5 in which the number of teeth in the central area was the same, and the tip angle of the large teeth in the central area was 60 °. It is considered that when the tooth tip angle is increased, a greater force is required to pierce the film at the beginning of cutting.

(Comparative Example 8)
FIG. 16 is an enlarged view of the central area of the cutting blade in which the tooth shape in the central area is an isosceles triangle and the tooth size is reduced. Cutting force was measured using the packaging container provided with this cutting blade. Although middle teeth were used, a larger cutting force was required than Comparative Example 6, which had 11 teeth in common. This is considered to be because a large force was required for the piercing at the beginning of cutting because the teeth became smaller. A larger cutting force was required than in Comparative Example 5 in which the central area widths were substantially equal. This is probably because the number of teeth increases and a large amount of force is required to pierce the wrap film at the beginning of cutting.

<Cutability test 2>
Next, in the cutting blade having the configuration shown in FIG. 2, three types of cutting blades having different blade widths d were prepared, and the cutting performance test 2 was performed. Specifically, the blade width d of Example 2 is 6 mm, the blade width d of Example 3 is 7 mm, and the blade width d of Example 4 is 8 mm. In addition, the material of each of these cutting blades and the configuration of the teeth in the central area and the side area are the same as those of the cutting blade used in Example 1. Each cutting blade was bonded to the packaging container in the same manner as in the cutting property test 1. Then, the polyvinylidene chloride wrap film accommodated in the container was actually cut in the same manner as in the cutability test 1, and the cutting force was measured.

(Examples 2, 3, and 4)
The measurement results are shown in Table 2. In Examples 2, 3 and 4, the average value was 450 g to 460 g. Even when the blade width of the cutting blade was changed, there was almost no difference in cutting force. Note that the cutting force of the metal cutting blade used in the current registered trademark “NEW Kurelap” according to this measurement method is 300 g to 500 g. It was shown that the biodegradable resin cutting blades of Examples 2, 3 and 4 according to the embodiment of the present invention have a cutting force equivalent to that of the current metal cutting blade.

  In addition, since the blade width d of the cutting blade used for the cutting property test 1 is 7 mm, the cutting blades of Example 1 and Example 3 are the same. The cutting force values of cutting ability test 1 and cutting ability test 2 are different because the cutting blades used in these tests were prepared manually one by one, and the roughness of the tooth tip edge Alternatively, it is considered that the strength of the packaging container, the adhesion state between the packaging container and the cutting blade, and the like are various.

<Sensitivity test 1>
Sensory test 1 was performed using the same packaging container as used in Examples 2, 3, and 4. Ten monitors cut the wrap film drawn out from the packaging container, and judged the sharpness at the time of cutting as “good”, “slightly good”, “normal”, and “bad”.

  As a result of the sensory test 1, the sharpness was “good” or “slightly good” for all of Examples 2, 3, and 4. In addition, when using a conventional metal cutting blade, it has a feeling of tearing the wrap film instantly, but in the case of a resin cutting blade, it has a feeling of piercing with a bubble at the initial stage of cutting, It is different from the thing.

<Durability test>
The durability test which cut | disconnects the wrap film of a polyvinylidene chloride 200 times was done by attaching the cutting blade of Example 1 which has the structure shown in FIG. 2 to the packaging container of the registered trademark "NEW Kurewrap". As a result, it was found that damage to the cutting blade made of biodegradable resin could hardly be confirmed, and there was no practical problem.

<Cutability test 3>
In this test, three types of cutting blades having different tooth configurations in the side area were prepared. In addition, the material and thickness of each of these cutting blades, and the structure of the teeth in the central area are the same as those of the cutting blade used in Example 1. Each cutting blade was bonded to the packaging container in the same manner as in the cutting property test 1. Then, the polyvinylidene chloride wrap film accommodated in the packaging container was actually cut in the same manner as in the cutting property test 1, and the cutting force was measured.

(Examples 5, 6, and 7)
Specifically, the cutting blade used in the cutting property test 3 is a cutting blade (Example 5) clearly shown in FIG. 2, a cutting blade having a tooth configuration clearly shown in FIG. 3 (Example 6), and FIG. 6 is a cutting blade (Example 7) having the tooth configuration shown in FIG. 3 in the central area and in FIG. 5 in the side area. That is, these three types of cutting blades share the same tooth configuration in the central area, but have different tooth configurations in the side area. The cutting blade of Example 5 is the same as the cutting blade used in Example 1. Table 3 shows the configuration of the side teeth in the side area of each cutting blade.

  FIG. 17 is a line graph showing the transition of the rotational force with respect to the rotational angle of the packaging container of Example 5 in the cutting property test 3. FIG. 18 is a line graph showing the transition of the rotational force with respect to the rotational angle of the packaging container of Example 6 in the cutting property test 3. FIG. 19 is a line graph showing the transition of the rotational force with respect to the rotational angle of the packaging container of Example 7 in the cutting property test 3. The results shown in the four line graphs (a), (b), (c) and (d) shown in FIGS. 17, 18 and 19 are the same measurements using the same packaging container. Measured by the method.

  The horizontal axis of FIGS. 17, 18 and 19 is the rotation angle (°) of the packaging container, and the vertical axis is the rotational force (force (g) required for rotation). The cutting blades of the packaging containers of Example 5, Example 6, and Example 7 all showed good cutting properties.

<Sensitivity test 2>
Sensory test 2 was performed using the same packaging container as that used in Example 5, Example 6, and Example 7. Ten monitors (group 1) and 17 monitors (group 2) not belonging to group 1 cut the wrap film and evaluated according to the criteria shown in Table 4.

  FIG. 20 is a bar graph showing the average score of the sensory test 2 by group 1. In FIG. 20, (a) is a case where a packaging container equivalent to Example 5 is used, (b) is a case where a packaging container equivalent to Example 6 is used, and (c) is a case where Example 7 is used. This is the case when an equivalent packaging container is used.

  According to the results shown in FIG. 20, it was found that the cutting blades of the packaging containers of Example 6 and Example 7 were cut better than the cutting blades of the packaging container of Example 5. This is because the cutting blades of Example 6 and Example 7 in which two types of large and small side teeth are alternately arranged in the side area have only side teeth having the same dimensions in the side area. This is because the transition from the piercing stage to the slitting stage and the progress of the slitting stage in the cutting of the wrap film are performed more smoothly than the cutting blade.

  FIG. 21 is a bar graph showing the number of monitors with the highest evaluation score among the three types of packaging containers in the sensory test 2 by group 2. In FIG. 21, (a) is a case where a packaging container equivalent to Example 5 is used, (b) is a case where a packaging container equivalent to Example 6 is used, and (c) is a case where Example 7 is used. This is the case when an equivalent packaging container is used.

  According to the results shown in FIG. 21, it was found that the cutting blade of the packaging container of Example 6 cuts best among Example 5, Example 6, and Example 7. It turned out that the structure of the tooth | gear of the side part area | region in the cutting blade of the packaging container of Example 6 can further smooth the transition from the piercing stage to the slitting stage and the progress of the slitting in cutting the wrap film.

  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, 24 ... Cutting blade, 26 ... bottom of the front wall of the container body, 28 ... central area, 30 ... side area, 31 ... first side teeth (side teeth), 32 ... second side teeth (side teeth), 33 ... side parts Third teeth (side teeth), 34 ... side fourth teeth (side teeth), 35 ... small teeth, 36 ... medium teeth (second teeth), 37 ... side teeth, 38 ... large teeth (first Teeth), 39 ... teeth, 40 ... push-pull gauge, 42 ... fixing jig.

Claims (6)

In a non-metallic V-shaped cutting blade attached to the back surface of the front wall of the lid in a packaging container for packaging a roll-shaped article,
It consists of a central area and side areas arranged on both sides of the central area,
The central area comprises a plurality of first teeth and a plurality of second teeth smaller than the first teeth;
One of the first teeth is disposed at a vertex of the V-shaped central area, and the other first teeth are disposed at a predetermined interval so as to sandwich the first tooth of the vertex.
The second teeth are disposed between the first teeth;
The first straight line connecting the tooth tip of the other first tooth in the central area and the tooth tip of the first tooth at the apex is more than the tooth tip of the second tooth in the central area. Located away from the front wall,
The side area comprises a plurality of side teeth;
The hypotenuse of at least one of the first teeth, the second teeth, and the side teeth has an arcuate shape that is recessed inward,
The second straight line that is parallel to the first straight line and connects the tooth tips of the second teeth passes through the tooth tips of the side teeth in the side area, or than the tooth tips of the side teeth, Ri position near that is remote from the front wall of the lid,
A cutting blade for a packaging container , wherein the outer edge of the side area includes teeth larger than the side teeth in a portion other than the outer edge of the side area .   The cutting blade for a packaging container according to claim 1, wherein the side area includes two kinds of side teeth arranged alternately. The cutting blade for a packaging container according to claim 1 or 2 , wherein the side teeth are the same size as the second teeth or smaller than the second teeth. Cutting edge for a packaging container according to any one of claims 1 to 3, wherein the cutting blade is made of resin. The cutting blade for a packaging container according to claim 4 , wherein the resin is a biodegradable resin. The packaging container which has the cutting blade described in any one of Claims 1-5 .

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