JP4996419B2 - 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 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.

  By the way, the cutting blade is generally made of metal (for example, Patent Document 1). Such a metal cutting blade is required to have a property of not being in close contact with the wrap film in addition to the cutting property. The reason for this is to prevent the so-called “rewinding” phenomenon that the leading end of the wrap film after cutting enters the packaging container when the lid is opened in a packaging container that contains a roll-shaped package such as a wrap film. is there. When this “rewinding” phenomenon occurs, the leading end of the wrap film sticks to the wrapping film accommodated in the packaging container, making it difficult to take out the leading end of the wrap film at the next use. Therefore, in order to prevent this “rewinding”, Patent Document 1 proposes to adjust the roughness of the surface of the metallic cutting blade. However, in consideration of environmental problems and safety in recent years, a non-metal cutting blade made of paper or resin has been examined in place of the conventional metal cutting blade.

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 2 to 5 below, the teeth in the central area of the cutting blade are made larger than the teeth in the side area, 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.
Japanese Patent No. 2621988 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 2 described above sharpens the tip of each tooth of the paper saw blade, but since the size of each tooth is all the same, cutting is performed. There is a problem with sex. In addition, since the cutting blades of Patent Documents 3 and 4 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. Further, the cutting blade of Patent Document 5 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.

  The present inventors first examined various shapes of cutting blades in order to obtain a non-metallic cutting blade capable of easily and reliably cutting a roll package such as a wrap film. And it is made of resin provided with large teeth suitable for piercing the film in the central area arranged in the central part of the cutting blade, and relatively small teeth suitable for slitting in the side areas arranged on both sides of the central area A cutting blade was developed.

  However, it has been found that a “rewinding” phenomenon may occur when a wrap film is cut using a resin cutting blade having the above-described shape.

  The present invention has been made in view of such circumstances, and by cutting the shape and surface roughness of the cutting blade, it has a sufficiently excellent cutting property and can sufficiently suppress the occurrence of rewinding. It aims at providing a packaging container provided with a blade and this cutting blade.

That is, the cutting blade of the present invention is 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.
(A) It is divided into a central area including the apex portion of the V-shape and side areas arranged on both sides of the central area,
(B) The central area has a plurality of first teeth each having the same tooth height, and a plurality of second teeth each having a tooth height lower than the first tooth and the same tooth height.
(C) One of the first teeth is arranged at the vertex, and the other one of the first teeth is arranged 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 side area has a plurality of side teeth;
(G) The tip of the side tooth is located on the second straight line or between the second straight line and the third straight line,
(H) At least one main surface has an arithmetic average roughness (Ra) of 0.8 μm or more.

  By providing a central area with the above-described configuration on the cutting blade, cutting of the wrap film or the like, which is a medium, can be performed in two stages, an initial “piercing” stage by the central area and a subsequent “cutting” stage by the side area. Divided. 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, 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. In addition, by setting the arithmetic average roughness (Ra) of the main surface of the cutting blade to 0.8 μm or more, the wrap film is brought into close contact with the cutting blade and the wrap film is rewound, and the wrap films adhere to each other. Can be prevented. The arithmetic average roughness of the cutting blade can be measured according to JIS B 0601. The tooth height of each tooth can be measured as the shortest distance between the bottom of a groove formed by adjacent teeth, that is, the third straight line connecting a plurality of tooth bases, and the tooth tip of the tooth.

  The cutting blade of the present invention preferably contains a polyester resin as a main component. When the cutting blade contains a polyester resin as a main component, it is possible to obtain a cutting blade having more sufficiently excellent cutting performance, feeling during cutting, and durability. Moreover, the occurrence of rewinding can be more sufficiently suppressed.

  The polyester resin contained in the cutting blade of the present invention is preferably at least one of a polylactic acid resin and a polyethylene terephthalate resin. Thereby, it is possible to obtain a cutting blade having a sufficiently excellent cutting performance, feeling during cutting, and durability. In addition, a biodegradable polylactic acid resin is preferably used from the viewpoint of environmental protection.

  The cutting blade of the present invention preferably has a tensile modulus of 1.5 to 10 GPa and a Rockwell hardness of 8 to 100 (HRM). With such a cutting blade, all of good cutting properties, good sharpness and excellent durability can be achieved at a higher level.

  Moreover, it is preferable that a side part area has 2 types of large and small side teeth with which tooth height differs alternately.

  In this way, by alternately arranging two kinds of large and small side teeth having different tooth heights in the side area, at the time of transition from the “piercing” stage to the “cutting” stage and the “cutting” stage, The number of side teeth that come into contact can be reduced. Therefore, the transition from the “piercing” stage to the “opening” stage is smoother than when the tooth height includes a plurality of single side teeth, and the wrap film can be cut open and cut with a smaller force. It becomes possible.

  Moreover, it is preferable that the cutting blade of this invention has a tooth | gear whose tooth height is higher than the said side tooth | gear of the said side area in the edge part of the cutting blade in the outer side of a side area.

  Even when cutting the wrap film is started from the end of the wrap film by arranging teeth having a higher tooth height than the side teeth of the side area at the end of the cutting blade outside the side area in this way. The cutting of the wrap film is divided into two stages, a “piercing” stage and a “cutting” stage. At the beginning of cutting, the only teeth that touch the wrap film are the teeth with high tooth height that are 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 tooth height of the side teeth is preferably the same as the tooth height of the second tooth or lower than the tooth height of the second tooth. 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.

  Further, the hypotenuse of at least one of the first teeth, the second teeth, the side teeth, and the teeth arranged at the end portions is formed in an arc shape recessed inward, that is, the shape of the teeth is a so-called ginkgo leaf shape. Is preferable. 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 be obtained.

  The cutting blade of the present invention preferably has a laminated structure in which a plurality of layers are laminated in a direction perpendicular to the main surface. With such a laminated structure, the strength and durability of the non-metallic cutting blade can be improved. Moreover, it becomes difficult to deform | transform a cutting blade at the time of the cutting | disconnection of a wrap film, and it can improve a cutting property further.

  The present invention also provides a packaging container provided with the above cutting blade. Since this packaging container comprises the cutting blade having the above-described characteristics, it is possible to provide a packaging container having excellent cutting properties. The cutting blade attached to the back surface of the front wall of the lid in the packaging container has a main surface opposite to the main surface facing the front wall of the lid (surface that contacts the wrap film when the lid is closed) of 0.8 μm. It is preferable to have the above arithmetic average roughness (Ra). Such a packaging container can sufficiently suppress rewinding of the wrap film.

  The packaging container of the present invention preferably has an adhesive portion on at least a part of the wall surface of the container body covered with the front wall of the lid. Thereby, the front-end | tip part of the cut | disconnected wrap film adheres to the adhesion part of the wall surface of a container main body, and generation | occurrence | production of rewinding can be suppressed more fully.

  It is preferable that the cutting blade of this invention is attached to the back surface of the front wall of the cover body of a packaging container through a 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, by optimizing the shape and surface roughness of the cutting blade, a cutting blade having sufficiently good cutting performance, good feeling at the time of cutting, and sufficient durability, and such a cutting blade are provided. A packaging container 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 is rotatable with respect to the container body 16 and is configured to cover the opening of the container body 16 and a part of the front wall 27 of the container body. And it has an adhesion part in a part (a part of area | region covered with the front wall 22 of a cover body) of the front wall 27 of a container main body. For the adhesive part, an ethylene-vinyl acetate resin, a hot melt resin based on synthetic rubber, or an acrylic, vinyl acetate or synthetic rubber emulsion is applied to the front wall 27 of the container body, and if necessary, It can be formed by drying.

  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 Then, the packaging container 10 is grasped, and 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.

  The front end portion of the wrap film 14 after cutting sticks to an adhesive portion provided on a part of the front wall 27 of the container body. Thereby, when pulling out the wrap film 14 again, the front-end | tip part of the wrap film 14 can be taken out easily.

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

  FIG. 2 is an enlarged view of the central portion of the cutting blade according to the first embodiment of the present invention. The main component of the cutting blade 24 is a polyester resin. Such a cutting blade 24 can be obtained by subjecting a sheet obtained by biaxially stretching a polyester resin to pressing or laser cutting to form a tooth having the shape 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 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 28 are small teeth 35 having the same dimensions as the side teeth 31 in the side area 30, teeth having a higher tooth height 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.

  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.

  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 this straight line L2 on the left and right sides is a third straight line connecting the straight line L1 and the tooth root. It is substantially parallel to (L3) and is located on the rear side (side closer to the front end edge of the lid front wall 22) than the straight line L1. That is, the straight line L2 is located between the straight line L1 and the straight line L3.

  Further, a straight line (fourth straight line) L4 that connects the tips of the side teeth 31 in the left and right side areas 30 is substantially parallel to the straight lines L1, L2, and L3 on the same side, and the straight line. It is located behind L1 and L2 (side closer to the tip edge of the lid front wall 22). That is, the straight line L4 on each side is located between the straight lines L2 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 extended line of the straight line L4 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 (tooth bases) between the large teeth 38 in the first stage piercing of the wrap film 14, and the cutting is hindered. This is because if the width is smaller 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 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 cutting blade according to the second embodiment of the present invention. The cutting blade 24 according to the second embodiment is composed of a central area 28 and side areas 30 located on both sides thereof, and the central area 28 includes a central area 28 of the cutting blade 24 according to the first embodiment. It has the same tooth configuration. 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 tooth heights. Yes.

  FIG. 4 is a partially enlarged view of a side area on one side of the 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, a plurality of side teeth smaller than the side first teeth 31 (hereinafter referred to as “side second teeth”) 32 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 by a straight line, and this straight line (fourth straight line) L4 is A straight line L1 connecting the tooth tips of the large teeth, a straight line L2 connecting the tooth tips of the middle teeth, and a straight line (third straight line) L3 connecting the tooth bases, and substantially behind the straight lines L1 and L2. It is located on the side (side near the front end 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.

  Further, the tooth tips of the plurality of side second teeth 32 can be connected with a straight line, and this straight line (fifth straight line) L5 is substantially parallel to the straight lines L1, L2, L3 and L4, and It is located behind the straight lines L1, L2, and L4 (on the side closer to the leading edge of the lid front wall 22). That is, the straight line L5 is located between the straight line L4 and the straight line L3.

  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.

  As shown in FIG. 4, the cutting blade 24 according to this embodiment provided with two types of large and small side teeth (a side first tooth 31 and a side second tooth 32) having different tooth heights in the side area is used. For example, since the number of side teeth that are in contact with the wrap film 14 at the same time during the transition from the “piercing” stage to the “cutting” stage and during the progress of the “cutting” stage, the force required for the transition from the piercing stage to the cutting stage is reduced. , And 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 (tooth bases) between the large teeth 38 in the first stage piercing of the wrap film 14, and the cutting is hindered. This is because if the width is smaller 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 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. Moreover, the interdental pitch between the side first teeth 31 and between 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 the cutting blade according to the third embodiment of the present invention. Although not shown, the cutting blade 24 of FIG. 5 is composed of a central area 28 and side areas 30 located on both sides thereof, and the central area 28 has a central portion of the cutting blade 24 according to the first and second embodiments. It has the same tooth configuration as the area 28. However, the cutting blade 24 of FIG. 5 is sandwiched between a plurality of side teeth smaller than the small teeth 35 (hereinafter referred to as “side third teeth”) 33 and the side third teeth 33 in the side area 30. The cutting according to the first and second embodiments is provided with a plurality of side teeth (hereinafter referred to as “side fourth teeth”) 34 that are larger than the small teeth 35 and smaller than the middle teeth 36 as described above. Different from the blade 24. In the side area 30, the side third teeth 33 are arranged so as to be adjacent to the middle teeth 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 with a straight line, and this straight line (sixth straight line) L6 is a straight line L1 that connects the tooth tips of the large teeth, the middle teeth L2 connecting the tooth tips and a straight line (third straight line) L3 connecting the tooth roots and substantially parallel to the straight lines L1 and L2 (the side closer to the leading edge of the lid front wall 22) Is located. That is, the straight line L6 is located between the straight line L2 and the third straight line L3.

  Further, the tooth tips of the plurality of side third teeth 33 can be connected by a straight line, and this straight line (seventh straight line) L7 is substantially parallel to the straight lines L1, L2, L3 and L6, and , Located behind the straight lines L1, L2 and L6 (side closer to the front edge of the lid front wall 22). That is, the straight line L7 is located between the straight line L6 and the straight line L3. Note that the tooth tips of the small teeth 35 in the central area are located between the straight lines L6 and L7.

  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. 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, when the cutting blade 24 having the side fourth teeth 34 having a higher tooth height than the small teeth 35 is used, the transition from the “piercing” stage to the “cutting” stage can be made smoother. it can. 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 tooth heights, the wrap film 14 is provided with a “cut open” stage. The number of side teeth that are in contact with each other at the same time is reduced, and the force required for the progress of “cut-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 (tooth bases) between the large teeth 38 in the first stage piercing of the wrap film 14, and the cutting is hindered. This is because if the width is smaller 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 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. Moreover, the interdental pitch between the side third teeth 33 and between the side teeth 4 teeth 34 is preferably 1.0 to 3.0 mm, 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 partial enlarged view of one end of a cutting blade according to a modification of the first, second, or third embodiment. The cutting blade 24 of FIG. 6 has teeth 39 larger than the side teeth 31 and the side teeth 32 of the side area 30 and the side teeth 31 outside the side area 30, that is, at both ends 29 of the cutting blade 24. And a tooth 31a of the same size.

  At the end portion 29 of the cutting blade 24, teeth 39 and teeth 31a are alternately arranged in the longitudinal direction of the cutting blade 24 at a constant interval. The tooth tip of the tooth 39 can be connected by a straight line, and this straight line L8 is substantially the same as the straight line connecting the tooth tips of the side teeth of the side area 30 (for example, the straight lines L4 and L5) and the straight line L3 connecting the tooth base. They are parallel to each other and are located in front of these straight lines (the side away from the front edge of the lid front wall 22). That is, the straight lines L4 and L5 are located between the straight line L8 and the straight line L3. Since the tooth 31 a is the same size as the side tooth 31, the tooth tip of the tooth 31 a is located on a straight line L <b> 4 that connects the tooth tips of the side tooth 31. FIG. 6 shows only one side area 30 and end portion 29 of the cutting blade 24, but the cutting blade 24 is symmetrically arranged on the other side area 30 and end portion 29 in the same manner. It has a configuration. The cutting blade 24 according to the present embodiment includes two teeth 39 and two teeth 31 a in each side area 30.

  If it is the cutting blade 24 provided with this structure, even if it is a case where the wrap film 14 is cut | disconnected from an end, the "piercing" of the wrap film 14 is performed by the tooth | gear 39 arrange | positioned at the edge part 29 of the cutting blade 24. . In addition, since the teeth 31 a having a lower tooth height than the teeth 39 are provided between the teeth 39 of the end portion 29, it is possible to reduce the number of teeth that are simultaneously in contact with the wrap film 14 in the “piercing” of the wrap film 14. . Therefore, the “piercing” of the wrap film 14 can be facilitated. After the “piercing” of the wrap film 14, several side teeth arranged closer to the end 31 of the end portion 29 and the end portion of the side area 30 are in contact with the wrap film 14, and the “cut open” is performed. proceed. Thereby, the wrap film 14 is smoothly opened and cut.

  In addition, the tooth height H7 of the tooth 39 disposed at the end portion 29 of the cutting blade 24 is, for example, 1.0 to 4.0 mm, more preferably 1.0 to 4.0 mm in terms of cutting performance, durability, and safety. It is good to be about 2.5 mm. The inter-tooth pitch between the teeth 39 is, for example, 1.0 to 9.0 mm, preferably 2.0 to 7.0 mm, more preferably 2.5 to 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 both end portions 29 of the cutting blade 24 is preferably about 2 to 50 in total.

  Further, the tooth height H3 of the teeth 31a arranged at the end 29 of the cutting blade 24 is preferably 0.3 to 2.5 mm, more preferably 0.5 to 2.0 mm. Further, the inter-tooth pitch between the teeth 31a is 1.0 to 9.0 mm, preferably 2.0 to 7.0 mm, and more preferably 2.5 to 6.5 mm. When the cutting blade 24 has such a tooth configuration at the end 29, the wrap film can be cut open more smoothly.

  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 cutting blade according to another embodiment of the present invention. In the side area 30 of the cutting blade in FIG. 7, two kinds of large and small side teeth 31 and 37 having different tooth heights 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. In addition, a straight line L4 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. Is substantially parallel to the straight line L2 connecting the middle teeth 36 and the straight line L3 connecting the tooth roots, and is located behind the straight lines L1 and L2 (the side closer to the leading edge of the lid front wall 22). is doing. That is, the straight line L4 is located between the straight line L2 and the straight line L3. 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.

  The arithmetic average roughness (Ra) of the main surface 24a of the cutting blade 24 in each of the above embodiments is 0.8 μm or more. The main surface 24 a comes into contact with the wrap film 14 when the wrap film 14 is cut. Since the main surface 24a has the arithmetic average roughness (Ra), the adhesion with the wrap film 14 can be sufficiently reduced. The arithmetic average roughness (Ra) can be measured in accordance with JIS B0601.

  The arithmetic average roughness (Ra) of the main surface 24a of the cutting blade 24 measured in accordance with JIS B0601 is preferably 0.8 to 100 μm, more preferably 0.9 to 50 μm. More preferably, it is 0.0-30 micrometers. When the arithmetic average roughness (Ra) is 1.0 μm or more, the adhesion of the wrap film to the cutting blade can be more sufficiently reduced. This makes it possible to more reliably attach the leading end of the wrap film in the packaging container after cutting to the adhesive portion of the front wall 27 (FIG. 1) of the container body, and the wrap films are attached to each other during the lid opening operation. The “rewinding” phenomenon of bonding to each other can be reliably prevented. On the other hand, by setting the arithmetic average roughness (Ra) to 30 μm or less, the strength of the cutting blade can be sufficiently maintained.

  The maximum height (Ry) of the main surface 24a of the cutting blade 24 measured in accordance with JIS B0601 is preferably 10 to 100 μm, more preferably 15 to 50 μm, and 20 to 45 μm. Is more preferable. When the maximum height (Ry) of the main surface 24a of the cutting blade 24 is less than 10 μm, the tip of the wrap film tends to adhere to the main surface of the cutting blade. On the other hand, when the maximum height (Ry) exceeds 100 μm, the strength and durability of the cutting blade tend to be impaired.

  In addition, the cutting blade 24 which has the main surface 24a of such predetermined arithmetic mean roughness (Ra) can be obtained by roughening the main surface of the raw material of a cutting blade. Such roughening treatment can be performed by embossing the surface of the material of the cutting blade during the material processing. The main surface of a predetermined arithmetic average roughness (Ra) can also be obtained by adding an inorganic filler to the composition for forming a cutting blade or applying inorganic powder or the like to the material surface of the cutting blade. A cutting blade 24 having 24a can be obtained. The cutting blade 24 can also be obtained by attaching a separately roughened sheet or film to the material surface of the cutting blade. As the inorganic filler and the inorganic powder, inorganic powders such as barium sulfate, calcium carbonate, titanium oxide, silica, and talc can be used.

  Examples of the material of the cutting blade according to each embodiment described above include polyester, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether ether ketone resin), PES (polyether sulfone resin), and the like. be able to.

  Thus, various resin components can be used, but the cutting blade of the present invention preferably contains a polyester resin as a main component. By using such a material, the progress of “piercing” and “cutting” of the wrap film can be made smoother, and the durability of the cutting blade can be made excellent. Among polyester resins, polyethylene terephthalate (PET) resin and polylactic acid resin are particularly preferable.

  The cutting blade concerning each above-mentioned embodiment can be formed using the composition which added the other component to the above-mentioned resin component. As components other than the resin component, in addition to the inorganic filler disclosed in Japanese Patent No. 3573605, heat stabilizers, light stabilizers, moisture-proofing agents, waterproofing agents, release agents, pigments, dyes, etc. may be included. Absent. As the inorganic filler, inorganic powders such as barium sulfate, calcium carbonate, titanium oxide, silica, and talc can be used.

  However, from the viewpoint of sufficiently obtaining the effects of the present invention, the content of the polyester resin is preferably 80% by mass or more and more preferably 90% by mass or more with respect to the entire cutting blade. From the viewpoint of obtaining the effects of the present invention more sufficiently, the cutting blade of the present invention is particularly preferably a cutting blade made of a polyethylene terephthalate resin or a polylactic acid resin. In addition, as a polyethylene terephthalate resin used for the cutting blade of this invention, a crystalline thing is preferable.

  In the cutting blade of the present invention, these materials are formed into a sheet form having a thickness of 0.05 to 0.5 mm, preferably 0.1 to 0.3 mm, more preferably 0.15 to 0.28 mm. After that, it can be formed by punching with a mold. In addition, when the thickness of a cutting blade becomes large, there exists a tendency for sufficient cutting property not to be acquired, and when the thickness of a cutting blade becomes small, there exists a tendency for favorable sharpness to be impaired. By setting the thickness of the cutting blade to 0.15 to 0.28 mm, it is possible to obtain a cutting blade capable of achieving both a good cutting property and a good sharpness at a high level. As the sheet, a biaxially stretched sheet is preferably used.

  Moreover, it is preferable that the cutting blade of each said embodiment is formed from the lamination type sheet | seat on which the some resin sheet which consists of the above-mentioned material was laminated | stacked. By adopting a laminated blade using such a laminated sheet, the durability of the cutting blade can be improved. The number of laminated sheets and the lamination method are not particularly limited.

  Even when this laminated sheet is used, the main surface of the cutting blade that comes into contact with the wrap film when cutting the wrap film (the surface that comes into contact with the wrap film when the packaging container is closed) has an arithmetic average roughness of 0.8 μm or more.

  In addition, as a cutting blade used for each said embodiment, a tensile elasticity modulus is 1.5-10.0 GPa from a viewpoint which makes favorable cutting property and the favorable feeling at the time of cutting compatible at a high level. It is preferable that the tensile elastic modulus is 3.0 to 4.5 GPa. Moreover, from the viewpoint of achieving both good cutting performance and durability at a high level, the Rockwell hardness is preferably 8 to 100 (HRM), and more preferably 50 to 80 (HRM). Here, the tensile elastic modulus refers to a numerical value measured according to JIS K 7127, and Rockwell hardness refers to a numerical value measured according to JIS K 7202.

  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.

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

  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 through a sealant material.

  In the laminated portion 50 of the packaging container, the sealant material 40, the adhesive layer 42, and the cutting blade 24 are laminated in this order on the back surface 22a of the front wall 22 of the lid. In the cutting blade 24, a layer 24b and a layer 24c each having a resin component as a main component are laminated in order from the adhesive layer 42 side. An adhesive layer may be provided between the layer 24b and the layer 24c.

  The cutting blade 24 bonded to the sealant material 40, which is a modified polyethylene resin, with a polyurethane adhesive (adhesive layer 42) is an ultrasonic bonding method between the sealant material 40 and the back surface 22a of the front wall of the packaging container lid. Is attached to the back surface 22a of the front wall of the packaging container. Since the cutting blade 24 attached to the back surface 22a of the front wall of the packaging container lid body via the sealant material 40 in this way is fixed to the packaging container lid body with sufficient adhesive force, it can be easily removed from the packaging container lid body. Does not peel. The main surface 24a of the cutting blade 24 has an arithmetic average roughness (Ra) of 0.8 μm or more. For this reason, the contact | adhesion power to the main surface 24a of the cutting blade 24 of a wrap film can fully be reduced.

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

  EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, a comparative example, and a reference example, this invention is not limited to a following example at all.

  First, the mechanical properties of the material used for the cutting blade were evaluated as follows. First, a sheet having a thickness of 250 to 255 μm made of each material shown in Table 1 was prepared.

<Tensile modulus evaluation>
Using TENSILON RTM-100 (manufactured by TOYO BALDWIN, trade name), the tensile strength at break of each sheet of Table 1 was measured according to JIS K 7127, and the tensile modulus was obtained. The results are shown in Table 2. From the results in Table 2, it was found that the sheets 1, 2, and 3 made of polyethylene terephthalate resin have high tensile elastic modulus and are not easily deformed, so that they are suitable as a cutting blade material.

<Evaluation of Rockwell hardness>
Using a digital Rockwell hardness tester DRH-M type (manufactured by Matsuzawa Seiki, trade name), the Rockwell hardness of each sheet in Table 1 was measured according to JIS K7202.

  The measurement results of Rockwell hardness are shown in Table 3. From the results of Table 3, it was found that the sheets 1, 2, and 3 made of polyethylene terephthalate resin are suitable as a cutting blade material because of their high Rockwell hardness. Moreover, the sheet | seat 4 which is unstretched polyethylene terephthalate resin showed the Rockwell hardness higher than the other unstretched sheet | seat 6,7,8. Sheets 5, 6, and 7, which are polylactic acid resins, showed higher Rockwell hardness than sheets 8 made of polypropylene resin.

  Next, in order to examine the optimum material for the shape of the above-mentioned cutting blade, a plurality of cutting blades having the same tooth shape with different materials were prepared as follows, and the sharpness was evaluated.

(Reference Example 1)
A V-shaped cutting blade was prepared using a commercially available sheet 1 (thickness: 250 μm) made of polyethylene terephthalate (PET) resin. The cutting blade includes a central area as shown in FIG. 7 and side areas adjacent to both outer sides thereof. Specifically, there are five large teeth 38, eight medium teeth 36, two small teeth 35 in the central area, and two large and small side teeth 31 and side portions of different sizes in the side area. There are 37-38 teeth 37 each. The tooth height of the large teeth 38 is 1.7 mm, the tooth height of the middle teeth 36 is 1.2 mm, the tooth height of the small teeth 35 is 0.8 mm, the tooth height of the side teeth 31 is 0.8 mm, and the side teeth. The tooth height of 37 is 1.2 mm.

  This cutting blade and a sealant material (ethylene methacrylic acid copolymer) are bonded to each other with a polyurethane-based adhesive, and the sealant material and the registered trademark “NEW Kurelap” manufactured and sold by Kureha Co., Ltd. are used. A packaging container (a 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) was bonded by an ultrasonic bonding method. Thus, a packaging container was obtained in which the cutting blade was attached to the back surface of the front wall of the lid through a sealant material made of an ethylene methacrylic acid copolymer.

(Reference Example 2)
Instead of the polyethylene terephthalate resin sheet 1 in Reference Example 1, a cutting blade and a cutting blade were prepared in the same manner as in Reference Example 1 except that a commercially available polyethylene terephthalate resin sheet 3 (thickness: 250 μm) was used. A packaging container attached to the back surface of the front wall of the lid was obtained.

(Reference Example 3)
The cutting blade and cutting blade were the same as in Reference Example 1 except that a commercially available sheet 5 (thickness: 250 μm) made of polylactic acid resin was used instead of the polyethylene terephthalate resin sheet 1 of Reference Example 1. A packaging container attached to the back surface of the front wall of the lid was obtained.

(Reference Example 4)
The cutting blade and the cutting blade were covered in the same manner as in Reference Example 1 except that a commercially available polypropylene resin sheet 8 (thickness: 255 μm) was used instead of the polyethylene terephthalate resin sheet 1 of Reference Example 1. A packaging container attached to the back side of the front wall of the body was obtained.

(Reference Example 5)
Instead of the polyethylene terephthalate resin sheet 1 of Reference Example 1, a non-stretched sheet (thickness: 275 μm) made of a general commercially available polypropylene resin was used in the same manner as in Reference Example 1, and a cutting blade, and A packaging container having a cutting blade attached to the back surface of the front wall of the lid was obtained.

(Reference Example 6)
In place of the sheet 1 made of polyethylene terephthalate resin of Reference Example 1 and using an unstretched sheet (thickness: 200 μm) made of a general commercially available polylactic acid resin, the cutting blade, And the packaging container with which the cutting blade was attached to the back surface of the front wall of a cover body was obtained.

(Reference Example 7)
The cutting blade and cutting blade were the same as in Reference Example 1 except that a commercially available sheet 6 (thickness: 250 μm) made of polylactic acid resin was used instead of the polyethylene terephthalate resin sheet 1 of Reference Example 1. A packaging container attached to the back surface of the front wall of the lid was obtained.

(Reference Example 8)
In place of the polyethylene terephthalate resin sheet 1 of Reference Example 1, a general commercially available polystyrene resin unstretched sheet (thickness: 200 μm) containing 10% by mass of talc as a filler was used as Reference Example 1. In the same manner as described above, a cutting blade and a packaging container in which the cutting blade was attached to the back surface of the front wall of the lid were obtained.

(Reference Example 9)
Reference Example 1 except that a general commercially available polystyrene resin-made unstretched sheet (thickness: 250 μm) containing 10% by mass of talc as a filler was used instead of the polyethylene terephthalate resin sheet 1 of Reference Example 1. In the same manner as described above, a cutting blade and a packaging container in which the cutting blade was attached to the back surface of the front wall of the lid were obtained.

(Reference Example 10)
Reference Example 1 except that instead of the polyethylene terephthalate resin sheet 1 of Reference Example 1, a general commercially available polystyrene resin unstretched sheet (thickness: 200 μm) containing 20% by mass of talc as a filler was used. In the same manner as described above, a cutting blade and a packaging container in which the cutting blade was attached to the back surface of the front wall of the lid were obtained.

(Reference Example 11)
Reference Example 1 except that instead of the polyethylene terephthalate resin sheet 1 of Reference Example 1, a general commercially available polystyrene resin unstretched sheet (thickness: 250 μm) containing 20% by mass of talc as a filler was used. In the same manner as described above, a cutting blade and a packaging container in which the cutting blade was attached to the back surface of the front wall of the lid were obtained.

<Sensitivity test>
A sensory test was performed using the packaging containers of Reference Examples 1-11. Ten monitors cut the wrap film drawn from the packaging container and evaluated the sharpness (feeling) at the time of cutting. Evaluation criteria were as follows using Reference Example 3 as a reference (3 points).

(Evaluation criteria for sensory test)
5 points: The sharpness is clearly superior to that of Reference Example 3.
4 points: Sharpness is slightly better than in Reference Example 3.
3 points—the same sharpness as in Reference Example 3.
2 points: Sharpness is slightly inferior to that of Reference Example 3.
1 point: The sharpness is clearly inferior to that of Reference Example 3.

  The average score of each monitor was used as the evaluation result of the sensory test. Table 4 shows the evaluation results of the sensory test.

  As a result of the sensory test, it was found that the cutting blades made of polyethylene terephthalate resin and polylactic acid resin had better sharpness than cutting blades made of other resins. Moreover, when compared with the same material (reference example 6 and reference example 7), when the thickness of the cutting blade became thin, there was a tendency for sharpness to fall.

  Next, cutting blades having different arithmetic average roughness (Ra) on the main surface in contact with the wrap film were prepared, and the adhesion between the cutting blade and the wrap film was evaluated.

Example 1
A sheet material (manufactured by Toray Industries, Inc., trade name: Lumirror X44, thickness: 25 μm) containing polyethylene terephthalate resin as a main component was prepared. The surface (main surface) of the sheet material has the arithmetic average roughness (Ra) and the maximum roughness (Ry) shown in Table 5. This sheet material and a sheet made of a commercially available polyethylene terephthalate (PET) resin (manufactured by Toray Industries, Inc., trade name: Lumirror S10, biaxial stretching (crystallinity), thickness: 250 μm) are bonded together with a polyurethane adhesive. A sheet-like blade material was obtained. From this blade material, a V-shaped cutting blade having the tooth configuration shown in FIGS. 2 and 4 was produced. As a result, a V-shaped cutting blade having a main surface with arithmetic average roughness (Ra) and maximum roughness (Ry) shown in Table 5 was obtained. The arithmetic average roughness (Ra) and the maximum roughness (Ry) of the main surface were measured using an ultra-deep shape measuring microscope (trade name: VK8500, manufactured by Keyence Corporation) in accordance with JIS B0601.

  After the front end of the wrap film (width 50 mm) is brought into close contact with the central portion of the main surface (the surface having the arithmetic average roughness (Ra) and the maximum roughness (Ry) shown in Table 5) of the prepared cutting blade, the front end The film end opposite to the part was pulled at a speed of 200 mm / min in the same direction as the tooth tip in the center area of the cutting blade, and the force required to peel the wrap film from the cutting blade was measured. This measurement was performed 3 times, and the average value thereof was defined as the adhesion. The results were as shown in Table 5.

(Example 2)
A sheet material of a commercially available polylactic acid resin (manufactured by Mitsui Chemicals, trade name: LACEEA TOF-250, thickness 250 μm) was prepared. The surface of the sheet material has the arithmetic average roughness (Ra) and the maximum roughness (Ry) shown in Table 5. From this sheet material, a V-shaped cutting blade having the tooth configuration of FIGS. 2 and 4 was produced. As a result, a V-shaped cutting blade having a main surface with arithmetic average roughness (Ra) and maximum roughness (Ry) shown in Table 5 was obtained. Then, evaluation was performed in the same manner as in Example 1. The results were as shown in Table 5.

(Comparative Example 1)
A V-shaped cutting blade was prepared and evaluated in the same manner as in Example 2 except that a V-shaped cutting blade was prepared using a commercially available sheet 1 (thickness: 250 μm) made of polyethylene terephthalate resin. . The results were as shown in Table 5.

  As a result of measuring the adhesion force, the wrap film did not adhere to the cutting blade of Example 1 at all. Moreover, the adhesive force of the cutting blade of Example 2 was in a range where there was no practical problem at all. Therefore, these cutting blades have excellent cutting properties and durability, and can sufficiently prevent the wrap film from rewinding.

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 cutting blade concerning 1st embodiment of this invention. It is an enlarged view of the center part of the 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 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 cutting blade concerning 3rd embodiment of this invention. It is a partial enlarged view of the edge part of the one side in the cutting blade concerning the modification of 1st, 2nd or 3rd embodiment. It is an enlarged view of the center part of the cutting blade concerning another embodiment of this invention. It is a schematic cross section of the lamination | stacking part of the packaging container in which the cutting blade which concerns on one Embodiment of this invention was attached to the back surface of the front wall of a cover body through a sealant material.

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 ... Cutting blade, 24a ... main surface, 26 ... bottom side of the front wall of the container body, 27 ... front wall of the container body, 28 ... center area, 29 ... end, 30 ... side area, 31 ... side first teeth ( Side teeth), 32 ... side second teeth (side teeth), 33 ... side third teeth (side teeth), 34 ... side fourth teeth (side teeth), 35 ... small teeth, 36 ... middle teeth (second teeth), 37 ... side teeth, 38 ... large teeth (first teeth), 39, 39a ... teeth, 40 ... sealant material, 42 ... adhesive layer, 50 ... laminated portion.

Claims (12)

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 that includes a V-shaped apex and side areas that are arranged on both sides of the central area
The central area is
A plurality of first teeth each having the same tooth height and a plurality of second teeth having a tooth height lower than that of the first tooth and each having the same tooth height;
One of the first teeth is arranged at the apex, and the other one of the first teeth is arranged at a predetermined interval around the first tooth of the apex,
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 side area is
A plurality of side teeth, and the tooth tips of the side teeth are located on the second straight line or between the second straight line and the third straight line;
A cutting blade for a packaging container, wherein at least one main surface has an arithmetic average roughness (Ra) of 0.8 μm or more.   The cutting blade for a packaging container according to claim 1, comprising a polyester resin as a main component.   The cutting blade for a packaging container according to claim 2, wherein the polyester resin is at least one of a polylactic acid resin and a polyethylene terephthalate resin.   The cutting blade for a packaging container according to any one of claims 1 to 3, wherein the tensile elastic modulus is 1.5 to 10 GPa and the Rockwell hardness is 8 to 100 (HRM).   The cutting edge for a packaging container according to any one of claims 1 to 4, wherein the side area has two kinds of side teeth with different tooth heights arranged alternately.   6. The tooth according to claim 1, further comprising a tooth having a tooth height higher than that of the side tooth of the side area at an end of the cutting blade outside the side area. Cutting blade for packaging containers.   The cutting height for a packaging container according to any one of claims 1 to 6, wherein a tooth height of the side teeth is the same height as the second teeth or lower than the second teeth.   The hypotenuse of at least one of the first teeth, the second teeth, the side teeth, and the teeth arranged at the end portion is in an arc shape recessed inward. A cutting blade for a packaging container according to any one of the above.   The cutting blade for a packaging container according to any one of claims 1 to 8, which has a laminated structure in which a plurality of layers are laminated in a direction perpendicular to the main surface. The cutting blade according to any one of claims 1 to 9 is provided on the back surface of the front wall of the lid,
A packaging container, wherein a main surface opposite to a main surface of the cutting blade facing the front wall of the lid body has an arithmetic average roughness (Ra) of 0.8 μm or more.   The packaging container according to claim 10, further comprising an adhesive portion on at least a part of the wall surface of the container body covered by the front wall of the lid.   The packaging container according to claim 10 or 11, 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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