KR101196974B1 - Cutting edge for packaging container and packaging container having the same - Google Patents

Abstract

The cutting blade 24 is divided into a central area 28 including a V-shaped vertex, a pair of intermediate areas 29 on the outside thereof, and a pair of side areas 30 on the outside thereof. The central area 28 has a plurality of first teeth having the highest tooth height and a plurality of second teeth having a lower tooth height than this, and the first tooth is disposed at the vertex and at predetermined intervals around the first tooth. The second tooth is disposed between the first tooth. The first straight line connecting the teeth of the first tooth, the second straight line connecting the teeth of the second tooth, the third straight line connecting the teeth of the first tooth and the second tooth are parallel, and the second straight line is the first straight line and the first It is located between 3 straight lines. This end of the intermediate tooth of the intermediate area 29 is located on the second straight line or between the second straight line and the third straight line. This end of the side teeth of the side area 30 is located on the second straight line or between the first straight line and the second straight line.

Description

Cutting blades for packaging containers and packaging containers having them {CUTTING EDGE FOR PACKAGING CONTAINER AND PACKAGING CONTAINER HAVING THE SAME}

This invention relates to the packaging container for accommodating the wrap film wound in roll shape to the cylindrical core, and the cutting blade used for the said packaging container.

Conventionally, packaging containers for wrap films of various formats are known. Most of them are made of thick paper, and consist of a container body for storing a wrap film wound in a roll shape, and a lid integrally provided with the container body. And the wrap film drawn out from the container is cut | disconnected by the sawtooth cutting blade attached to the back surface of the front surface wall of a lid | cover.

Generally as such a cutting blade, a metal thing is used from a viewpoint of cutting property and durability, but the thing which is made of paper and resin nonmetallic is examined from recent environmental problems and consideration to user safety.

It is difficult for such a non-metal cutting blade to exhibit good cutting properties as much as a metal cutting blade, and in particular, a large force is required for cutting of wrap films such as polyethylene, polypropylene, and polyvinylidene chloride, which are rich in elasticity. It is desired to improve the cutting property.

In order to respond to this demand, cutting blades of various shapes have been proposed. For example, in a straight cutting blade, teeth are easily penetrated into the wrap film by providing teeth at both ends of the cutting blade facing outward (for example, Patent Documents 1 and 2). In the V-shaped cutting blade in which the center portion of the cutting blade is closer to the base of the container than the side portion, it is easy to dig into the wrap film at the beginning of the cutting by arranging a relatively large tooth at the V-shaped apex (eg For example, in Patent Documents 3 and 4), contrary to the V-shape, an inverted V-shaped cutting blade in which the side area of the cutting blade protrudes from the center portion is provided with teeth having its teeth facing outward at both ends thereof. (For example, patent document 5), etc. are proposed.

By the way, the cutting method of the wrap film by the cutting blade with which the packaging container was equipped differs normally according to the shape of a cutting blade. For example, in the case of a V-shaped cutting blade, the wrap film accommodated in the packaging container is taken out, the wrap film drawn out of the packaging container by a predetermined amount is applied to the teeth protruding in the center portion thereof, and the packaging container is twisted to wrap it. Dig into the center of the film and cut it. On the other hand, in the case of a straight or inverted V-shaped cutting blade, the wrap film accommodated in the packaging container is taken out, and a wrap film drawn out of the packaging container by a predetermined amount is placed on one end of the cutting blade, and the teeth of the end are placed on the wrap film. The cut film is then cut by pulling the wrap film to cut away from the end of the cutting blade toward the opposite end.

Patent Document 1: Japanese Utility Model Application Publication No. 6-20224 Patent Document 2: Japanese Utility Model Application Publication No. 11-151 Patent Document 3: Japanese Utility Model Application No. 2547868 Patent Document 4: Japanese Patent Application Laid-open No. Hei 5-178344 Patent Document 5: Japanese Patent Application Laid-open No. Hei 8-40433

The present inventors examined the cutting property, cutting quality, and durability of the wrap film by the cutting blade which has the various shape mentioned above. As a result, compared with the conventional V-shaped cutting blades of Patent Documents 3 and 4, the conventional straight cutting blades of Patent Documents 1 and 2 smoothly cut the wrap film after allowing the wrap film to dig. Since it is difficult to progress, it turned out that the cutting property of a wrap film is not enough. In addition, compared to conventional V-shaped cutting blades such as Patent Documents 3 and 4, cutting blades such as Patent Document 5, in which teeth protruding from the edges of the cutting blades, also have cuts in the wrap film after digging into the wrap film. It tends to be difficult to progress smoothly, and it turns out that there exists a problem in tooth durability.

However, when the present inventors examined in more detail, even if it uses the conventional V-shaped cutting blades like patent documents 3 and 4, it turned out that the cutting property is not enough. That is, although the cutting blades of the various shapes mentioned above are used for the packaging container of the wrap film, the user cannot confirm the shape of the cutting blade one by one and cannot adopt the optimal cutting method, and the V-shaped cutting blade is not used. Even if it is provided, there are not many cases where it is going to cut | disconnect the wrap film toward the edge part on the opposite side from the edge part of a cutting blade. Thus, when cutting a wrap film by the cutting method cut | disconnected from the edge part of a cutting blade, the cutting blade which has a conventional V shape like patent document 3 and 4 mentioned above does not have sufficient cutting property. Became clear.

This invention is made | formed in view of such a situation, and cutting | disconnection is favorable even if the cutting | disconnection of a wrap film is carried out from either the vertex part of the V-shape of a cutting blade, or one end of a cutting blade, and the feeling and durability at the time of cutting are fully enough. It is an object to provide an excellent cutting blade and a packaging container having such a cutting blade.

The cutting blade of the present invention is a non-metallic V-shaped cutting blade having a plurality of teeth attached to a packaging container containing a roll-shaped package and cutting the roll-shaped package, wherein the cutting blade is

(a) a central area including a V-shaped vertex, a pair of side areas each including one of both ends of the V-shape, and a pair of intermediate areas respectively disposed between the pair of side areas and the central area; Become,

(b) the central area has a plurality of first teeth having the highest tooth height and the same tooth height, and a plurality of second teeth having the same tooth height and lower than the first tooth,

(c) one of the plurality of first teeth is disposed at the apex and the other first tooth is arranged at a predetermined interval around the first tooth of the apex,

(d) the second tooth is disposed between the first tooth,

(e) a first straight line connecting the teeth of the first tooth, a second straight line connecting the teeth of the second tooth and a third straight line connecting the teeth of the first tooth and the second tooth are parallel to each other, A second straight line is located between the first straight line and the third straight line,

(f) the intermediate area has a plurality of intermediate values,

(g) The end of the intermediate tooth is located on the second straight line or between the second straight line and the third straight line,

(h) the side area has a plurality of side teeth,

(i) The end of the side teeth is located on the second straight line or between the first straight line and the second straight line.

It is characterized by.

By providing a center area having the above-described configuration of the teeth on the cutting blade, when cutting the wrap film from the central area including the V-shaped vertex of the cutting blade, cutting of the wrap film or the like, which is a medium, is caused by the center area. It is divided into two stages of the initial "perforation" stage of cutting, and the "cutting" stage by the intermediate | middle area and the side area after that. Furthermore, the "drilling" step is divided into two steps, a drilling process by the first tooth having the highest tooth height and a drilling process by the second tooth having a lower tooth height than the first tooth. In the beginning, since only the first tooth is in contact with the wrap film, the force required for drilling may be small. In addition, the first tooth alone requires a force to penetrate the wrap film due to the resistance of the bones between the first teeth, but after the first tooth is drilled, the second tooth penetrates the wrap film. The "perforation" step in the beginning of cutting can be further facilitated. Thereafter, the transition from the "drilling" step to the "cutting" step can be facilitated by the intermediate value having a relatively low tooth height provided in the intermediate area. Thereafter, also in the side area, the wrap film is smoothly cut and the wrap film is cut. On the other hand, when the cutting of the wrap film is started from the side area of the cutting blade, the cutting of the wrap film or the like as a medium is performed by the initial "perforation" step of the cutting by one side area and the "incision" by the other area after that. It is divided into two stages. Since the side value of the side area protrudes higher than the middle value of the intermediate area, the value of contacting the wrap film at the beginning of cutting is only a few side teeth on the cutting edge end side. Therefore, the force required for the perforation of the wrap film originally cut may be small. After that, the transition from the "drilling" stage to the "cutting" stage can be facilitated by the intermediate tooth having a low tooth height provided in one intermediate area. Subsequently, also in the center area, the other intermediate area, and the other side area, the wrap film is smoothly cut and the wrap film is cut. Therefore, the wrap film can be easily and smoothly cut both in the case where the cutting of the wrap film is started from the end of the wrap film and the start of the wrap film is started. In addition, the tooth height of each tooth can be measured as the shortest distance between the bottom of the valley formed by the adjacent tooth, ie, the 3rd straight line which connects the plurality of roots, and the tooth tip of the said tooth.

In addition, it is preferable that at least one tooth tip of the plurality of side teeth faces outward from the tooth tips of the first tooth, the second tooth and the intermediate tooth. That is, it is preferable that the inclined side of the top side of the cutting blade in at least one side tooth is longer than the inclined side of the edge side of the cutting blade.

In this way, when the tip of the side teeth in the side area is directed outward from the teeth of the first, second and intermediate teeth, the cutting of the wrap film is started from the end of the wrap film, that is, the side area of the cutting blade. Perforation of the wrap film can be further facilitated. In addition, even when the cutting of the wrap film is started from the center area including the V-shaped vertex of the cutting blade, the wrap film is less likely to be caught when making a cut in the side area. I can do it more smoothly.

In addition, the tooth height of the side teeth is preferably the same as the second tooth or higher than the second tooth and lower than the first tooth.

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

In addition, in another aspect, the cutting blade of the present invention is a non-metallic V-shaped cutting blade having a plurality of teeth attached to a packaging container containing a rolled package and cutting the rolled package. Cutting blade,

(a) a central area including a V-shaped vertex, a pair of side areas each including one of both ends of the V-shape, and a pair of intermediate areas respectively disposed between the pair of side areas and the central area; Become,

(b) the central area has a plurality of first teeth having the highest tooth height and the same tooth height, and a plurality of second teeth having the same tooth height and lower than the first tooth,

(c) one of the plurality of first teeth is disposed at the apex and the other first tooth is arranged at a predetermined interval around the first tooth of the apex,

(d) the second tooth is disposed between the first tooth,

(e) a first straight line connecting the teeth of the first tooth, a second straight line connecting the teeth of the second tooth and a third straight line connecting the teeth of the first tooth and the second tooth are parallel to each other, A second straight line is located between the first straight line and the third straight line,

(f) the intermediate area has a plurality of intermediate values,

(g) The end of the intermediate tooth is located on the second straight line or between the second straight line and the third straight line,

(h) the side area has a plurality of side teeth,

(j) The distal end of the side teeth has at least one distal end of the plurality of side teeth facing outward from the distal end of the first tooth, the second tooth and the intermediate tooth.

It is characterized by.

By providing a center area having the above-described configuration of the teeth on the cutting blade, when cutting the wrap film from the central area including the V-shaped vertex of the cutting blade, cutting of the wrap film or the like, which is a medium, is caused by the center area. It is divided into two stages of the initial "perforation" stage of cutting, and the "cutting" stage by the intermediate | middle area and the side area after that. Furthermore, the "drilling" step is divided into two steps, a drilling process by the first tooth having the highest tooth height and a drilling process by the second tooth having a lower tooth height than the first tooth. In the beginning, since only the first tooth is in contact with the wrap film, the force required for drilling may be small. In addition, the first tooth alone requires a force to penetrate the wrap film due to the resistance of the bones between the first teeth, but after the first tooth is drilled, the second tooth penetrates the wrap film. The "perforation" step in the beginning of cutting can be further facilitated.

Thereafter, the transition from the "drilling" step to the "cutting" step can be facilitated by the intermediate value having a relatively low tooth height provided in the intermediate area. Thereafter, also in the side area, the wrap film is smoothly cut and the wrap film is cut. Since at least one tooth tip of the side teeth in the side area is directed outward from the other tooth tip, the wrap film is less likely to be caught when making an incision in the side area, so that the cutting of the wrap film in the “incision” step is more smoothly. can do.

On the other hand, when the cutting of the wrap film is started from the side area of the cutting blade, the cutting of the wrap film or the like as a medium is performed by the initial "perforation" step of the cutting by one side area and the "incision" by the other area after that. It is divided into two stages. Since the side area | region is provided with the side tooth which faces outwardly from the tooth tip of a 1st tooth, a 2nd tooth, and an intermediate tooth, the force required for the perforation of the wrap film initially cut | disconnected may be small. After that, the transition from the "drilling" step to the "cutting" step can be facilitated by the intermediate tooth having a low tooth height provided in one intermediate area. Subsequently, also in the center area, the other intermediate area, and the other side area, the wrap film is smoothly cut and the wrap film is cut. Therefore, the wrap film can be easily and smoothly cut both in the case where the cutting of the wrap film is started from the end of the wrap film and the start of the wrap film is started.

In addition, the tooth height of each tooth can be measured as the shortest distance between the bottom of the valley part formed by the adjacent tooth, ie, the 3rd straight line which connects a plurality of tooth roots, and the tooth tip of the said tooth.

In addition, it is preferable that the intermediate area has two kinds of intermediate values of different sizes of different teeth arranged alternately.

By providing such intermediate teeth in the intermediate area, the number of intermediate teeth in contact with the wrap film can be reduced at the time of the transition from the "perforation" step to the "cutting" step and the "cutting" step in cutting the wrap film. . Therefore, the transition from the "perforation" step to the "cutting" step becomes smoother than when the plurality of intermediate teeth having the same height are provided, and the wrap film can be cut and cut with a smaller force.

In addition, the tooth height of the intermediate tooth is preferably the same as the second tooth or lower than the second tooth.

By providing such intermediate | middle teeth in an intermediate area, a wrap film can be cut | disconnected with the outstanding cutting feeling in the "incision" step in cutting a wrap film.

Moreover, it is suitable that the inclined side in at least one of a 1st tooth, a 2nd tooth, an intermediate tooth, and a side tooth becomes an arc shape concave inward, ie, the shape of a tooth is what is called ginkgo leaf shape.

In such a shape, it is possible to widen the interdental pitch while making the tip angle an acute angle in order to secure cutting property. Thereby, it is not necessary to increase the number of teeth which belong to a fixed length range in the longitudinal direction of a cutting blade, and it can suppress that the force required for the perforation of a wrap film becomes large. Moreover, since the width | variety becomes wider as a terminal part, the effect of the durability improvement of a tooth is also acquired.

When the cutting blade of this invention adheres this to a packaging container, it can provide the packaging container which was excellent in cutting property. Moreover, it is preferable that the cutting blade of this invention is affixed on the back surface of the front surface wall of a packaging container through a modified polyethylene resin. Thereby, a cutting blade can be reliably fixed to a packaging container with sufficient strength. Examples of modified polyethylene resins include ethylene vinyl acetate copolymers, ethylene methacrylic acid copolymers, ionomers containing ethylene resin as a main component, and the like. Among these, especially an ethylene methacrylic acid copolymer is preferable.

According to the present invention, cutting of the wrap film is performed from either of the V-shaped apex of the cutting blade and one end of the cutting blade. A packaging container having a blade can be provided.

1 is a perspective view showing the form of a packaging container 10 to which the present invention is applied.
It is a partially enlarged view of the center part of the cutting blade which concerns on 1st Embodiment of this invention.
It is a partially enlarged view of one side part in the cutting blade which concerns on 1st Embodiment of this invention.
4 is a perspective view showing the form of a packaging container 10 to which the present invention is applied.
It is a partially enlarged view of one side part in the cutting blade which concerns on 2nd Embodiment of this invention.
It is a partially enlarged view of one side part in the cutting blade which concerns on 3rd Embodiment of this invention.
It is a partially enlarged view of the center part of the cutting blade which concerns on the modification of 1st, 2nd, 3rd embodiment of this invention.
It is a schematic cross section of the lamination part of the packaging container attached to the back surface of the front wall of a cover via the sealant material whose cutting blade which concerns on one Embodiment of this invention is resin.

[First Embodiment]

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

The upper part of the container main body 16 is opened as an opening part for taking out the wrap film 14. In addition, the lid 18 extends continuously from the top edge 20 of the rear face wall of the container body 16. Therefore, the cover 18 is rotatable with respect to the container main body 16, and is comprised so that the opening part of the container main body 16 may be covered.

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

It is a partially enlarged view of the center part of the cutting blade which concerns on 1st Embodiment of this invention. The cutting edge 24 which concerns on this embodiment is symmetrically centered about the center line (reference | symbol CL of FIG. 2) which passes through the vertex of a V, The center area 28 and the intermediate area arrange | positioned at both sides ( 29).

The center area 28 which concerns on this embodiment is comprised from 15 teeth 35, 36, 38 in total as shown in FIG. The central area 28 is a tooth having a small tooth height (hereinafter referred to as "sochi") 35, and a tooth having a higher tooth height than the sochi 35 (second tooth: hereafter referred to as "medium") 36 And teeth 38 having a higher tooth height than the median 36 (first tooth: hereafter referred to as "substitute"). In addition, in the following description, the subscripts 36 and 38 of the median and substitution are appropriately attached to the alphabet. In addition, the tooth height of a tooth can be measured as the shortest distance between the straight line (third straight line) L3 which connects a tooth root, and the vertex of the said tooth.

One 38a of the facings 38 is located at the apex of the V-shape (the longitudinal center of the central area 28) of the cutting blade 24, and the other facings 38b and 38c are the central facing 38a. They are arranged at regular intervals, two each from side to side with the center as the center. This end of the first first facing 38a in the center and the second ends of the second and third facings 38b and 38c on each of the left and right sides can be connected in a straight line. The first straight line L1 is located on the front side (the side spaced apart from the tip edge of the lid front face wall 22 in FIG. 1) rather than the tip of the middle teeth 36 on the left and right sides of the central area 28. . That is, the tooth tip of the intermediate value 36 is located between the straight line (third straight line) L3 and straight line L1 which connect a tooth root.

In addition, eight intermediate | middle values 36 in the center area 28 are arrange | positioned four each in each left and right side. The four intermediate teeth 36a and 36b on the center side are arranged at regular intervals between the substitutes 38a, 38b and 38c, and the other four intermediate teeth 36c and 36d are arranged at the same interval as the third substitutes It is arrange | positioned outside 38c). The ends of the intermediate values 36a, 36b, 36c, and 36d on each of the left and right sides can be connected by a straight line (second straight line) L2, and this straight line L2 on each of the left and right sides is substantially the same as the straight line L1. It is parallel and located behind the straight line L1 (the side closer to the tip edge of the cover front face wall 22). That is, the straight line L2 is located between the straight line L1 and the straight line L3.

In the intermediate area 29, two types of intermediate teeth 31 and 32 having different tooth heights in the longitudinal direction of the cutting blade 24 are alternately provided. The intermediate tooth (hereinafter referred to as "middle first tooth") 31 having a lower tooth height than the intermediate tooth 32 is the same tooth height as the small value 35 in the center area 28, and the intermediate first value. The intermediate teeth (hereinafter referred to as "intermediate second teeth") 32 having a higher tooth height than the teeth 31 are the same tooth heights as the intermediate teeth 36 in the central area 28. The straight line L2 connecting the ends of the middle teeth 36 of the center area 28 passes through the ends of the middle second teeth 32 of the middle area 29.

Moreover, the straight line (fourth straight line) L4 which connects the tooth tip 35 of the center area 28 and the tooth tip of the intermediate | middle 1st tooth 31 of the intermediate area 29 is the center of the 28 area. It is located substantially parallel to the straight line L1 and the straight line L2 connecting the two ends of the opposite teeth 38 and further behind the straight line L2 (the side closer to the tip edge of the cover front face wall 22). have. That is, the straight line L4 is located between the straight line L2 and the straight line L3. In this way, by disposing the ends of the intermediate teeth 31 and 32 of the intermediate area 29 on the same straight line or parallel straight line with the straight lines L1 and L2, respectively, the cutting of the wrap film can be made more smoothly. have.

It is a partially enlarged view of one side part in the cutting blade which concerns on 1st Embodiment of this invention. The cutting blade 24 which concerns on this embodiment is equipped with the side area 30 on the opposite side to the center area 28 side of the intermediate area 29. As shown in FIG. Although the edge part of the cutting blade 24 is not specified in FIG. 3, the cutting blade 24 is provided with the tooth 39 similarly to FIG. In addition, the cutting blade 24 of this embodiment is equipped with the tooth similar to FIG. 3 also in the other side area 30. As shown in FIG.

The side area | region 30 is provided with the side tooth 39 which this tip turned outward. The teeth end of the side teeth 39 can be connected by a straight line (a fifth straight line) L5, and these straight lines L5 on each of the left and right sides connect the teeth ends of the middle second teeth 32 of the middle area 29. It is substantially parallel to the straight line L4 connecting the vertices of the straight line L2 and the intermediate first tooth 31, and is further forward than the straight lines L2 and L4 (the tip end portion of the cover front face wall 22 in Fig. 1). On the side away from the edges. Moreover, the straight line L5 which connects the distal end of the side teeth 39 is behind the straight line L1 which connects the distal end of the facing 38 of the center area 28 (the edge of the front end of the cover front face wall 22). Located on the side close to. That is, the straight line L5 is located between the straight line L1 and the straight line L2. In addition, this end of the side teeth 39 may be located on the straight line L2. Thus, the cutting of the wrap film can be made smoother by arrange | positioning the tooth tip of the side tooth 39 of the side area 30 on the straight line parallel to the straight lines L2 and L4.

The direction of the tooth tip of each tooth can be calculated | required based on the direction of the straight line which connects the midpoint between the roots in both sides of the tooth, and the tooth tip of the said tooth. The straight line K1 in the side teeth 39 is located at the center line CL of the cutting edge than the straight lines K2 of the intermediate teeth 31 and 32 in the cutting blade 24 front (protrusion direction). Since it extends in the direction spaced apart from FIG. 2), the end of the side teeth 39 is directed outward from the ends of the middle first teeth 31 and the middle second teeth 32.

In the cutting blade 24 according to the present embodiment, the tip angles α of the small teeth 35, the intermediate teeth 36, the substitutes 38, the intermediate first teeth 31, and the intermediate second teeth 32, respectively. (FIG. 2 and FIG. 3) are angles suitable for the perforation of the wrap film 14. FIG. In this embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tip angle α is preferably in the range of 30 ° to 90 °, more preferably 40 ° to 70 °. This is because if larger than 90 °, enormous force is required to penetrate the wrap film 14, and if smaller than 30 °, the durability of the teeth 31 to 38 itself tends to be impaired. On the other hand, the tip angle β of the side teeth 39 is also set to an angle suitable for drilling the wrap film 14.

In this embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tip angle β is preferably in the range of 20 ° to 60 °, more preferably 20 ° to 40 °. When larger than 60 degrees, enormous force is needed to penetrate the wrap film 14, and when smaller than 20 degrees, there exists a tendency to impair the durability of the side teeth 39 itself.

Moreover, in the side tooth 39, the straight line which is parallel to the centerline CL (FIG. 2) of the cutting blade 24, and passes through the root of the outer side (end side of the cutting blade) of the side tooth 39, and a side tooth It is preferable that the angle (gamma) (FIG. 3) which the inclination edge of the outer side (end side of a cutting blade) of 39 makes is 2-20 degrees. Thereby, it becomes possible to make the cutting property in both the case where the side tooth 39 is used for the perforation of a wrap film, and the case where it is used for the cutting of a wrap film to a higher level.

The shape of each of the small teeth 35, the middle teeth 36, the counter teeth 38, the middle first teeth 31 and the middle second teeth 32 may be a simple isosceles triangle shape, but in this embodiment, the inclined sides At least one of them is preferably in the shape of a tip or a ginkgo leaf shape in which an arc shape is concave inward.

Although the shape of the side tooth 39 may be a straight line of inclination of a triangle, it is suitable to set it as the shape of the tip spread or the ginkgo leaf shape in which at least one of the inclination edges becomes inwardly concave arc shape. This is to improve durability while maintaining the tip angles α and β at the acute angles described above. Moreover, when it is set as such a shape, the number of teeth can be reduced within the same length range rather than when the inclined side is made into a straight line, and it contributes to the reduction of the force required for cutting | disconnection.

Next, the method to cut the wrap film 14 using the packaging container 10 which has the cutting blade 24 which concerns on this embodiment is demonstrated, referring drawings. As a method of cutting the wrap film 14, two cutting methods shown in FIG. 1 and FIG. 4 are mentioned. 1 and 4 are perspective views showing the form of a packaging container 10 to which the present invention is applied. The packaging container 10 shown in FIG. 1 and FIG. 4 is equipped with the cutting blade 24 which has the structure of the tooth shown in FIG. 2 and FIG.

One cutting method (method shown in FIG. 1) first penetrates the wrap film 14 in the center area 28 including the V-shaped apex of the cutting blade 24, and thereafter, the intermediate areas 29 on both sides. ) And the perforated wrap film 14 in the order of both side areas 30 (hereinafter referred to as "cutting method 1" for convenience). The other cutting method (method shown in FIG. 4) first penetrates the wrap film 14 in one side area 30a of the cutting blade 24, and then adjoins the side area 30a. Method of cutting the perforated wrap film 14 in the order of one intermediate area 29a, the central area 28, the other intermediate area 29b, and the other side area 30b (hereinafter, for convenience). "Cutting method 2").

In the cutting method 1, first, as shown in FIG. 1, the packaging container 10 is grasped by one hand, the other hand is grasped by the front end center part of the wrap film 14, and it draws out by predetermined amount. The thumb of the hand holding the packaging container 10 is placed on the center portion of the cover front wall 22 and the packaging container 10 is twisted in the front side, that is, in the direction of arrow A. FIG.

At this time, the first facing 38a at the apex of the cutting blade 24 first contacts the wrap film 14 to pierce it (FIG. 2). At the same time, the second confrontation 38b, and further, the third confrontation 38c abuts on the wrap film 14 to penetrate it. Thus, since the first contact with the wrap film 14 is only the five substitutes 38 having the largest interdental pitch and the highest tooth height, the force for twisting the packaging container 10 at the beginning of cutting may be small. That is, since the minimum force required for each replacement 38 to penetrate the wrap film 14 is constant, approximately five times the force is the minimum force for twisting the packaging container 10. When the tooth angle is reduced and the interdental pitch is reduced as in the related art, since the number of teeth in contact with the wrap film 14 becomes large, the force exerted on the packaging container 10 is inevitably large, and the feeling of use is also impaired. In this embodiment, there is no such problem.

Subsequently, the median 36 abuts on the wrap film 14, and the wrap film 14 penetrates through the median 36. Here, for example, assuming that there is no intermediate value 36, since the pitch between the substitutes 38 is wide, the valleys (interdentals) between the teeth 38 become resistance and require a large force to cut the wrap film 14. Done. However, in this embodiment, since the intermediate | middle tooth 36 penetrates the wrap film 14 between the substitutes 38 following the perforation of the wrap film 14 by the substitute 38, the perforation of the wrap film 14 is carried out. It is smooth.

In addition, although the maximum number of the intermediate | middle values 36 which contact | connect the wrap film 14 at the same time is a maximum of eight, the number of the intermediate | middle values 36 which contact | connect the wrap film 14 at the same time is actually less than eight, and also by the substitution 38 Since the perforation of the wrap film 14 is performed and the periphery is weakened, the force required for the perforation by the intermediate teeth 36 is smaller than that during perforation by the substitute 38. In this way, the cutting of the second step by the median from the cutting of the first step by the substitute 38 is also performed smoothly without imparting resistance to the user.

In addition, when the packaging container 10 is twisted in the direction of arrow A, the latch 35 of the center area 28 penetrates the wrap film 14 between the 3rd and 4th intermediate values 36c, 36d, and wraps. The incision of the film 14 proceeds to the intermediate area 29. Once the initial openings of sufficient size have been formed in the wrap film 14, there is no need for a particularly large force to cut the wrap film 14, and the intermediate first teeth 31 and the intermediate second teeth 32 are then removed. Also in the side area 30 which consists of the intermediate area 29 and side teeth 39 which are formed (FIG. 3), the wrap film 14 is cut | disconnected and cut | disconnected smoothly.

In the cutting method 2, first, as shown in FIG. 4, the packaging container 10 is hold | maintained by one hand, and the front end of the side part side of the wrap film 14 is grasped | pulled out by the other hand, and it draws out by predetermined amount. And while fixing the container with the hand holding the packaging container 10, the other hand pulls up the wrap film 14 to an upward direction, ie, arrow B direction, and one end part of the wrap film 14 is cut out by the cutting blade ( It strongly presses on one side area 30a of 24).

The continuation of the cutting method 2 which pulls up the wrap film 14 further in the arrow B direction and cuts the wrap film 14 is demonstrated, referring FIG. When the wrap film 14 is pulled up, several side teeth 39 which belong to the side area 30 of the cutting blade 24 and are provided at the end of the cutting blade 24 penetrate the wrap film 14. At the same time, the wrap film 14 is in contact with several side teeth 39 provided on the intermediate area 29 side of the side area 30.

When the wrap film 14 is further pulled up in the direction of arrow B, the wrap film 14 is penetrated by these side teeth 39. In addition, when pulling up the wrap film 14 in the arrow B direction, normally, the wrap film 14 is pulled a little to the front side (user side), but this end of the side teeth 39 is the other tooth 31- Since it faces outward from 38), it becomes possible to match the tension direction of this wrap film 14, and this tip direction, and can penetrate the wrap film 14 more easily.

When the wrap film 14 is further pulled up in the direction of the arrow B, the cut of the wrap film 14 shifts from the "punch" step to the "cut" step. In other words, if the initial punched portion having a sufficient size is formed by the side teeth 39, a particularly large force is not necessary to cut the wrap film 14 thereafter, and the intermediate first having a lower height than the side teeth 39 is required. The wrap film 14 is smoothly cut by the intermediate area 29 formed of the teeth 31 and the intermediate second teeth 32. Subsequently, also in the center area 28, the intermediate area 29b, and the side area 30b shown in FIG. 4, the wrap film 14 is cut | disconnected and cut | disconnected smoothly.

When the cutting blade 24 according to the present embodiment is used, when cutting the wrap film 14, no particularly large force is required, and this is the tip angle α of each tooth 31, 32, 35, 36, 38. ) And the need for excessively reducing the distal end angle β of the side teeth 39, and further improves the durability of each tooth 31, 32, 35, 36, 38, 39.

The number of each tooth with which the cutting blade 24 is equipped can be adjusted suitably according to the length and the interdental pitch of the cutting blade 24 in the longitudinal direction. However, in the cutting method 1, it is preferable that the total number of the teeth which belongs to the center area 28 shall be 5-31 pieces, It is more preferable to set it as 7-25 pieces from a viewpoint of making the perforation of a wrap film further easier. More preferably, it is set to 19 pieces.

In addition, in cutting methods 1 and 2, it is preferable that the total number of teeth which belongs to one intermediate area 29 shall be 10-100, and it is more preferable to set it as 20-90 from a viewpoint of making the cutting of a wrap film more smooth. It is preferable and it is more preferable to set it as 40-60 pieces.

In addition, in the cutting method 2, it is preferable that the total number of the teeth which belongs to one side area 30 shall be 1-150 from a viewpoint of making the perforation of the tooth to a wrap film further easier, and it is more preferable to set it as 5-100. Preferably, it is more preferable to set it as 10-50 pieces. When the total number of teeth belonging to the side area 30 becomes excessive, the area | region of the side area 30 in the cutting blade 24 becomes relatively large as a result, and favorable cutting | disconnection when cutting the wrap film by the cutting method 1 is carried out. Sex tends to be impaired.

In addition, when the tooth height (protrusion amount) of the substitute 38 and the median 36 or the side teeth 39 is excessively large, the distance from the fixed portion of the cutting blade 24, that is, the cover front face wall 22 The distance from the edge of the tip is long, and there is a fear that the durability is impaired. Moreover, when this height is large, there is a possibility that the hand of the person using the packaging container 10 may be injured. For this reason, in view of cutting property, durability, and safety, for example, the tooth height H1 of the substitute 38 of 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 1.2 to 2.5 mm and the median 36 is preferably 0.8 to 2.0 mm, more preferably 0.9 to 1.5 mm, and the tooth height H3 of the small teeth 35 is Preferably it is 0.4-1.5 mm, More preferably, you may be 0.5-1.0 mm.

The interdental pitch of the central area 28 is preferably between 3.0 and 9.0 mm, more preferably between 3.5 and 7.0 mm, still more preferably between 4.0 and 6.0 mm and between the intermediate teeth 36. Preferably it is 3.0-9.0 mm, More preferably, it is 3.5-7.0 mm, More preferably, you may be 4.0-6.0 mm. In the case where the interdental pitch between the substitutes 38 and the intermediate teeth 36 exceeds 9.0 mm, the valleys between the substitutes 38 in the "perforation" step of the wrap film 14 in the cutting method 1 (ippu) The film 14 is caught in li) and it tends to cause trouble in cutting. On the other hand, when the interdental pitch between the substitutes 38 and the intermediate teeth 36 is narrower than 3.0 mm, the number of teeth provided in the center area 28 increases, and as a result, the force required for drilling increases, resulting in good cutting property. This tends to be damaged.

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

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

[Second Embodiment]

5 is a partially enlarged view of one side portion in the cutting blade according to the second embodiment of the present invention. The cutting blade 24a of FIG. 5 differs from the cutting blade 24 of the said embodiment by providing the side teeth 33 and 34 in the side area 30. That is, the cutting blade 24a is provided with the structure of the tooth same as the cutting blade 24 of the said embodiment in the center area (not shown) and the intermediate area 29 (FIG. 2). In addition, the cutting blade 24a has the structure of the tooth similar to FIG. 5 also in the other side area and an intermediate area.

In the side area 30 of the cutting blade 24a of this embodiment, the side surface height 33 which is the same shape and a tooth height as the middle 1st tooth 31 of the intermediate area 29, and the side part which this end faced outward. The substitutes 34 are alternately provided. The distal end of the side facing 34 is located on a straight line L2 connecting the distal end of the middle tooth 36 of the central area 28 and the distal end of the middle second tooth 32 of the middle area 29. In addition, the tooth tip of the side edge 33 is located on the straight line L4 which connects the tooth tip of the middle 1st tooth 31 of the intermediate area 29. Moreover, as shown in FIG.

The side teeth 33 have an end angle equal to the end angle α of the middle first tooth 31 and the middle second tooth 32. Although the shape of the side surface latch 33 may be a simple isosceles triangle shape, it is suitable to set it as the shape which the end which spreads the arc shape which at least one of the inclined sides is concave inside. Thereby, durability can be improved, maintaining this tip angle (alpha) at acute angle to some extent. Moreover, when it is set as such a shape, the number of teeth can be reduced within the same length range rather than when the inclined side is made into a straight line, and it contributes to the reduction of the force required for cutting | disconnection.

The direction of the tooth tip of each tooth can be calculated | required based on the direction of the straight line which connects the midpoint between the roots in both sides of the tooth, and the tooth tip of the said tooth. The straight line K3 in the side facing 34 is the center line CL of the cutting edge than the straight line K2 of the intermediate teeth 31 and 32 in the cutting edge 24a front (protrusion direction). Since it extends in the direction spaced apart from Fig. 2), the end of the side facing 34 is directed outward from the ends of the middle teeth 31, 32 and the side facing 33. As shown in Figs.

In the cutting blade 24a according to the present embodiment, the tip angles α of the small teeth 35, the intermediate teeth 36, the substitutes 38, the intermediate first teeth 31, and the intermediate second teeth 32, respectively. 2 and 5 are angles suitable for drilling of the wrap film 14. In this embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tip angle α is preferably in the range of 30 ° to 90 °, more preferably 40 ° to 70 °. This is because if larger than 90 °, enormous force is required to penetrate the wrap film 14, and if smaller than 30 °, the durability of the teeth 31 to 38 itself tends to be impaired. On the other hand, the distal angle? Of the side facing 34 is also an angle suitable for drilling of the wrap film 14.

In this embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tip angle β is preferably in the range of 20 ° to 60 °, more preferably 20 ° to 40 °. This is because when larger than 60 °, enormous force is required to penetrate the wrap film 14, and when smaller than 20 °, there is a tendency to impair the durability of the side facing 34 itself.

Moreover, in the side facing 34, the straight line which is parallel to the center line CL (FIG. 2) of a cutting blade, and passes through the root of the outer side (end side of a cutting blade) of the side facing 34, and the side teeth 39 It is preferable that the angle (gamma) (FIG. 5) which the inclined side of the outer side (edge side of a cutting blade) of the edge makes (2) is 2-20 degrees. Thereby, it becomes possible to make the cutting property in both the case where the side facing 34 is used for the perforation of a wrap film, and the case where it is used for the cutting of a wrap film to a higher level.

As for the shape of the side facing 34, it is more preferable to set it as the shape of the tip spread or ginkgo leaf in which at least one of the inclined sides becomes the arc shape which concave inwardly rather than each side of a triangle is linear shape. This is to improve the durability while maintaining the tip angle β at the acute angle described above. Moreover, when it is set as such a shape, the number of teeth can be reduced within the same length range rather than when the inclined side is made into a straight line, and it contributes to the reduction of the force required for cutting | disconnection.

Next, the method to cut the wrap film 14 using the packaging container which has the cutting blade 24a which concerns on this embodiment is demonstrated, referring drawings. As a method of cutting the wrap film 14, two cutting methods shown in FIG. 1 and FIG. 4 are mentioned. 1 and 4 are perspective views showing the form of a packaging container 10 to which the present invention is applied. The packaging container 10 shown in FIG. 1 and FIG. 4 is equipped with the cutting blade 24a which has the structure of the tooth shown in FIG. 2 and FIG.

One cutting method (method shown in FIG. 1) first penetrates the wrap film 14 in the central area 28 including the V-shaped apex of the cutting blade 24a, and thereafter, the intermediate areas 29 on both sides. ) And the perforated wrap film 14 in the order of both side areas 30 (hereinafter referred to as "cutting method 1" for convenience).

The other cutting method (method shown in FIG. 4) first penetrates the wrap film 14 in one side area 30a of the cutting blade 24a, and then adjoins the side area 30a. Method of cutting the perforated wrap film 14 in the order of one intermediate area 29a, the central area 28, the other intermediate area 29b, and the other side area 30b (hereinafter, for convenience). "Cutting method 2").

In the cutting method 1, first, as shown in FIG. 1, the packaging container 10 is grasped by one hand, the other hand is grasped by the front end center part of the wrap film 14, and it draws out by predetermined amount. The thumb of the hand holding the packaging container 10 is placed on the central portion of the cover front face wall 22 and the packaging container 10 is twisted in the front side, that is, in the direction of arrow A. FIG.

At this time, the 1st facing 38a in the apex part of the cutting blade 24a initially contacts the wrap film 14, and it penetrates this (FIG. 2). At the same time, the second confrontation 38b, and further, the third confrontation 38c abuts on the wrap film 14 to penetrate it. Thus, since the first contact with the wrap film 14 is only the five substitutes 38 having the largest interdental pitch and the highest tooth height, the force for twisting the packaging container 10 at the beginning of cutting may be small. That is, since the minimum force required for each replacement 38 to penetrate the wrap film 14 is constant, approximately five times the force of the force becomes the minimum force for twisting the packaging container 10.

When the tooth angle is reduced and the interdental pitch is reduced as in the related art, since the number of teeth in contact with the wrap film 14 becomes large, the force exerted on the packaging container 10 is inevitably large, and the feeling of use is also impaired. In this embodiment, there is no such problem.

Subsequently, the median 36 abuts on the wrap film 14, and the wrap film 14 penetrates through the median 36. Here, for example, assuming that there is no intermediate value 36, since the pitch between the substitutes 38 is wide, the valleys (interdentals) between the substitutes 38 become resistance and require a large force to cut the wrap film 14. Done. However, in this embodiment, since the intermediate | middle tooth 36 penetrates the wrap film 14 between the substitutes 38 following the perforation of the wrap film 14 by the substitute 38, the perforation of the wrap film 14 is carried out. It is smooth.

In addition, although the maximum number of the intermediate | middle values 36 which contact | connect the wrap film 14 at the same time is a maximum of eight, the number of the intermediate | middle values 36 which contact | connect the wrap film 14 at the same time is actually less than eight, and also by the substitution 38 Since the perforation of the wrap film 14 is performed and the periphery is weakened, the force required for the perforation by the intermediate teeth 36 is smaller than that during perforation by the substitute 38. In this way, the cutting of the second step by the median from the cutting of the first step by the substitute 38 is also performed smoothly without imparting resistance to the user.

In addition, when the packaging container 10 is twisted in the direction of arrow A, the latch 35 of the center area 28 penetrates the wrap film 14 between the 3rd and 4th intermediate values 36c, 36d, and wraps. The incision of the film 14 proceeds to the intermediate area 29. Once the initial openings of sufficient size have been formed in the wrap film 14, there is no need for a particularly large force to cut the wrap film 14, and the intermediate first teeth 31 and the intermediate second teeth 32 are then removed. Also in the side area 30 which consists of the intermediate area 29 and side teeth 33 and 34 which are formed (FIG. 5), the wrap film 14 is cut | disconnected and cut | disconnected smoothly.

In the cutting method 2, as shown in FIG. 4, the packaging container 10 is hold | maintained by one hand, and the front end part of the side part side of the wrap film 14 is grasped | pulled out by the other hand, and it draws out by predetermined amount. And while fixing the container with the hand holding the packaging container 10, the other hand pulls up the wrap film 14 to an upward direction, ie, arrow B direction, and one end part of the wrap film 14 is cut out by the cutting blade ( It strongly presses on one side area 30a of 24a).

In this cutting method 2, only the some side facing 34 provided in the edge part of the cutting blade 24a shown in FIG. 5 at the beginning of a cutting contact with the wrap film 14 is shown. Thus, compared with the cutting blade which has only the same tooth height in a side area, the number of teeth which contact | connect a wrap film at the beginning of cutting can be made small, and a wrap film can be easily penetrated.

The continuation of the cutting method 2 which pulls up the wrap film 14 further in the arrow B direction and cuts the wrap film 14 is demonstrated, referring FIG. When the wrap film 14 is pulled up, several side facings 34 having high heights belonging to the side area 30 of the cutting blade 24a and provided at the end of the cutting blade 24a are wrapped with the wrap film 14. Drill through). Since the tip of the side facing 34 faces outward from the other teeth 31 to 38, the tension direction of the wrap film 14 and the tip direction can be made to coincide with each other, so that the wrap film 14 can be easily penetrated. Can be. When the wrap film 14 is further pulled up in the direction of the arrow B, several side facings 34 provided in the intermediate area 29 abut the wrap film 14 to pierce the wrap film 14. As a result, an initial opening having a sufficient size is formed.

When the wrap film 14 is further pulled up in the direction of the arrow B, the cut of the wrap film 14 shifts from the "punch" step to the "cut" step. That is, if an initial punched portion of sufficient size has been formed by the side confrontation 34, no particularly large force is necessary to cut the wrap film 14, and the intermediate first teeth 31 and the intermediate second teeth ( The wrap film 14 is smoothly cut by the intermediate area 29 formed of 32. Subsequently, also in the center area 28, the intermediate area 29b, and the side area 30b shown in FIG. 4, the wrap film 14 is cut | disconnected and cut | disconnected smoothly.

That is, in the case of the cutting blade 24a, a wrap film can be easily cut | disconnected from either the V-shaped vertex part of the cutting blade 24a, and one end of the cutting blade 24a, and the feeling at the time of a cutting is also favorable. Do.

The total number of suitable teeth, the tooth height and the interdental pitch in the center area 28 and the intermediate area 29 of the cutting blade 24a are the same as in the first embodiment. The total number of teeth belonging to one side area 30 is preferably 1 to 150, more preferably 5 to 100, and even more preferably 10 to 50. When the total number of teeth belonging to the side area 30 becomes excessive, the area | region of the side area 30 in the cutting blade 24a will become large as a result, and favorable cutting property at the time of cutting a wrap film by the cutting method 1 Tends to be damaged.

The tooth height H2 of the side facing 34 of the side area 30 becomes like this. Preferably it is 0.8-2.0 mm, More preferably, 0.9-1.5 mm, The tooth height H3 of the side sole 33 is preferable. Preferably it is 0.4-1.5 mm, More preferably, you may be 0.5-1.0 mm. In addition, the interdental pitch between the side facings 34 and the interdental pitch between the side facings 33 are preferably 1.0 to 3.5 mm, more preferably 1.5 to 3.0 mm.

[Third embodiment]

6 is a partially enlarged view of one side portion in the cutting blade according to the third embodiment of the present invention. The cutting edge 24b of FIG. 6 differs from the cutting edge 24 of 1st Embodiment by the point which has the side tooth 40 in the side area 30. As shown in FIG. That is, the cutting blade 24b is provided with the structure of the tooth same as the cutting blade 24 of the said embodiment in the center area (not shown) and the intermediate area 29. As shown in FIG. Moreover, the cutting blade 24b has the structure of the tooth similar to FIG. 6 also in the other side area and an intermediate area.

The side teeth 40 provided in the side area 30 of the cutting blade 24b of this embodiment are the same shape as the intermediate 1st tooth 31 and the intermediate 2nd tooth 32 which belong to the intermediate area 29. As shown in FIG. Have The straight line L5 connecting the ends of the side teeth 40 is located between the straight line L1 connecting the replacement of the center area and the straight line L2 connecting the middle value of the center area. Even if such side teeth 40 are provided, the effects of the present invention can be obtained. That is, a wrap film can be easily cut | disconnected from either the V-shaped vertex part of the cutting blade 24b, and one edge part of the cutting blade 24b, and the feeling at the time of cutting is also favorable. Moreover, the cutting blade 24b provided with the side teeth 40 is more excellent in durability.

The side tooth 40 has a tooth tip angle equal to the tooth tip angle α of the intermediate first tooth 31 and the intermediate second tooth 32. Although the shape of the side tooth 40 may be a simple isosceles triangular shape, it is suitable to set it as the shape which the end which the arc shape which at least one of the inclined sides becomes inwardly concave is spread. Thereby, durability can be improved, maintaining this tip angle (alpha) at acute angle to some extent. In the case of such a shape, the number of teeth can be reduced within the same length range than in the case where the inclined side is in a straight shape, contributing to the reduction of the force required for cutting.

In the cutting blade 24b according to the present embodiment, the small teeth 35, the intermediate teeth 36, the counter teeth 38, the intermediate first teeth 31, the intermediate second teeth 32, and the side teeth 40. Each tip angle (alpha) (FIG. 2 and FIG. 6) becomes an angle suitable for the perforation of the wrap film 14. As shown in FIG. In this embodiment in which the wrap film 14 is made of polyvinylidene chloride, the tip angle α is preferably in the range of 30 ° to 90 °, more preferably 40 ° to 70 °. This is because when larger than 90 °, enormous force is required to penetrate the wrap film 14, and when smaller than 30 °, the durability of the teeth 31 to 40 itself tends to be impaired.

In addition, the shapes of the small teeth 35, the intermediate teeth 36, the counter teeth 38, the intermediate first teeth 31, and the intermediate second teeth 32 and the side teeth 40 may be simple isosceles triangle shapes. In this embodiment, at least one of the inclined sides is preferably in the shape of a tip spread or a ginkgo leaf shape in which an arcuate shape is concave inward. This is to improve the durability while maintaining the tip angle α at the acute angle described above. In the case of such a shape, the number of teeth can be reduced within the same length range than in the case where the inclined side is in a straight shape, contributing to the reduction of the force required for cutting.

Next, the method to cut the wrap film 14 using the packaging container which has the cutting blade 24b which concerns on this embodiment is demonstrated, referring drawings. As a method of cutting the wrap film 14, two cutting methods shown in FIG. 1 and FIG. 4 are mentioned. 1 and 4 are perspective views showing the form of a packaging container 10 to which the present invention is applied. The packaging container 10 shown in FIG. 1 and FIG. 4 is equipped with the cutting blade 24b which has the structure of the tooth shown in FIG. 2 and FIG.

One cutting method (method shown in FIG. 1) first penetrates the wrap film 14 in the central area 28 including the V-shaped apex of the cutting blade 24b, and then the intermediate areas 29 on both sides. ) And the perforated wrap film 14 in the order of both side areas 30 (hereinafter referred to as "cutting method 1" for convenience).

The other cutting method (method shown in FIG. 4) first penetrates the wrap film 14 in one side area 30a of the cutting blade 24b and then adjoins the side area 30a. Method of cutting the perforated wrap film 14 in the order of one intermediate area 29a, the central area 28, the other intermediate area 29b, and the other side area 30b (hereinafter, for convenience). "Cutting method 2").

In the cutting method 1, first, as shown in FIG. 1, the packaging container 10 is grasped by one hand, the other hand is grasped by the front end center part of the wrap film 14, and it draws out by predetermined amount. The thumb of the hand holding the packaging container 10 is placed on the central portion of the cover front face wall 22 and the packaging container 10 is twisted in the front side, that is, in the direction of arrow A. FIG.

At this time, the 1st facing 38a in the apex part of the cutting blade 24b initially contacts the wrap film 14, and it penetrates this (FIG. 2). At the same time, the second confrontation 38b, and further, the third confrontation 38c abuts on the wrap film 14 to penetrate it. Thus, since the first contact with the wrap film 14 is only the five substitutes 38 having the largest interdental pitch and the highest tooth height, the force for twisting the packaging container 10 at the beginning of cutting may be small. That is, since the minimum force required for each replacement 38 to penetrate the wrap film 14 is constant, approximately five times the force of the force becomes the minimum force for twisting the packaging container 10.

When the tooth angle is reduced and the interdental pitch is reduced as in the related art, since the number of teeth in contact with the wrap film 14 becomes large, the force exerted on the packaging container 10 is inevitably large, and the feeling of use is also impaired. In this embodiment, there is no such problem.

Subsequently, the median 36 abuts on the wrap film 14, and the wrap film 14 penetrates through the median 36. Here, for example, assuming that there is no intermediate value 36, since the pitch between the substitutes 38 is wide, the valleys (interdentals) between the teeth 38 become resistance and require a large force to cut the wrap film 14. Done. However, in this embodiment, since the intermediate | middle tooth 36 penetrates the wrap film 14 between the substitutes 38 following the perforation of the wrap film 14 by the substitute 38, the perforation of the wrap film 14 is carried out. It is smooth.

In addition, although the maximum number of the intermediate | middle values 36 which contact | connect the wrap film 14 at the same time is a maximum of eight, the number of the intermediate | middle values 36 which contact | connect the wrap film 14 at the same time is actually less than eight, and also by the substitution 38 Since the perforation of the wrap film 14 is performed and the periphery is weakened, the force required for the perforation by the intermediate teeth 36 is smaller than that during perforation by the substitute 38. In this way, the cutting of the second step by the intermediate value from the cutting of the first step by the substitute 38 is also performed smoothly without giving resistance to the user.

In addition, when the packaging container 10 is twisted in the direction of an arrow A, the latch 35 of the center area 28 penetrates the wrap film 14 between the 3rd and 4th intermediate values 36c and 36d, Incision of the wrap film 14 proceeds to the intermediate area 29. Once the initial openings of sufficient size have been formed in the wrap film 14, there is no need for a particularly large force to cut the wrap film 14, and the intermediate first teeth 31 and the intermediate second teeth 32 are then removed. Also in the side area 30 which consists of the intermediate area 29 and side teeth 40 which are formed (FIG. 6), the wrap film 14 is cut | disconnected and cut | disconnected smoothly.

In the cutting method 2, as shown in FIG. 4, the packaging container 10 is hold | maintained by one hand, and the front end part of the side part side of the wrap film 14 is grasped | pulled out by the other hand, and it draws out by predetermined amount. And while fixing the container with the hand holding the packaging container 10, the other hand pulls up the wrap film 14 to an upward direction, ie, arrow B direction, and one end part of the wrap film 14 is cut out by the cutting blade ( It strongly presses on one side area 30a of 24b).

In this cutting method 2, only the some side teeth 40 provided in the edge part of the cutting blade 24b shown in FIG. 6 at the beginning of a cutting contact with a wrap film. For this reason, it becomes possible to easily penetrate a wrap film.

The continuation of the cutting method 2 which pulls up the wrap film 14 further in the arrow B direction and cuts the wrap film 14 is demonstrated, referring FIG. When the wrap film 14 is pulled up, several side teeth 40 which belong to the side area 30 of the cutting blade 24b, and are provided in the edge part of the cutting blade 24b, penetrate the wrap film 14. When the wrap film 14 is further pulled up in the direction of the arrow B, several side teeth 40 provided on the intermediate area 29 side are in contact with the wrap film 14 to pierce the wrap film 14. As a result, an initial opening having a sufficient size is formed.

When the wrap film 14 is further pulled up in the direction of the arrow B, the cut of the wrap film 14 shifts from the "punch" step to the "cut" step. In other words, if the initial punched portion having a sufficient size is formed by the side teeth 40, then a particularly large force is unnecessary for cutting the wrap film 14, and the intermediate first having a lower height than the side teeth 40 is required. The wrap film 14 is smoothly cut by the intermediate area 29 formed of the teeth 31 and the intermediate second teeth 32. Subsequently, also in the center area 28, the intermediate area 29b, and the side area 30b shown in FIG. 4, the wrap film 14 is cut | disconnected and cut | disconnected smoothly.

That is, in the case of the cutting blade 24b, a wrap film can be easily cut | disconnected from either the V-shaped vertex part of the cutting blade 24b, and one edge part of the cutting blade 24b, and the feeling at the time of cutting is also favorable. Do.

In the cutting blade 24b, the number of side teeth 40 provided in one side area 30 is preferably 5 to 100, more preferably 10 to 50, and even more preferably 20 to 45. desirable. When the number of side teeth 40 provided in one side area 30 is less than 20, in the cutting method which starts cutting of a wrap film from one side area 30 of the cutting blade 24b, There exists a tendency for the formation range of the initial perforation part of a film to become narrow, and the smoothness of the transition from a "perforation" step to a "cutting" step is impaired. When the number of side teeth 40 provided in one side area 30 exceeds 100, the cutting method which starts cutting from the center area of the cutting blade 24b WHEREIN: When cutting a wrap film There is a tendency for a good feeling of cut in the "incision" step of the toner to be damaged.

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

[Modifications of First, Second, and Third Embodiments]

7 is a partially enlarged view of a central portion of a cutting blade according to a modification of the first, second, and third embodiments of the present invention. The cutting blade 24c of FIG. 7 differs from the cutting blade 24 of the said embodiment in that only the side tooth 31 is provided in the intermediate area 29. That is, the cutting blade 24c has the structure of the same value as the cutting blade 24 which concerns on 1st Embodiment in the center area 28 and a side area (not shown).

The straight line L4 connecting the ends of the side teeth 31 is a straight line L2 connecting the ends of the middle teeth 36 in the center area 28 and a straight line L3 connecting the plurality of teeth. Located in between. Even when the intermediate area 29 is comprised only by the side teeth 31 of the same tooth height like the cutting blade 24c, the effect of this invention can be acquired and a cut of a wrap film can be performed easily.

As mentioned above, although preferred embodiment of this invention was described in detail, of course, this invention is not limited to the said embodiment.

In addition, although the wrap film consists of polyvinylidene chloride in each said embodiment, even if it is a wrap film which consists of other resin, this invention can be applied. In this case, the tooth height, interdental pitch, tooth tip angle and the like can be appropriately changed from the above dimensions.

In addition, not only a wrap film but a roll-shaped package may be aluminum foil or paper.

Moreover, as a material of the cutting blade of said each embodiment, although it can be a valcanized fiber, a resin impregnated paper, and a resin thing, it is preferable that it is made of resin excellent in strength especially. As an example of resin used, polyester, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether ether ketone resin), PES (polyether sulfone resin), etc. are mentioned. Among these, polyester is preferable and polyethylene terephthalate is more preferable.

It is also possible to use environmentally friendly biodegradable resin among resin. Biodegradable resins are decomposed into low molecular weight compounds by the action of microorganisms present in nature when they are discarded after use, while maintaining the same functions as conventional resins during use. It is a polymer material which decomposes and has such a function, and it can provide the cutting blade which considered environment more. Examples of the biodegradable resins include polylactic acid resins and polyglycolic acid resins.

The cutting blade which concerns on said each embodiment can be formed using individually 1 type of the above-mentioned resin material, or using what mixed 2 or more types. Furthermore, 5 to 70 mass% of inorganic powders, such as calcium carbonate, titanium oxide, a silica, barium sulfate, and a talc, are added to the resin material which mixed individual or 2 or more types, with respect to the whole material of a cutting blade, It may be formed. By adding an inorganic powder, mechanical strength can be improved.

The cutting blades can be formed by punching with a mold after these materials have a sheet thickness of 0.05 to 0.5 mm, preferably 0.1 to 0.3 mm, and more preferably 0.20 to 0.28 mm. . Moreover, when the thickness of a cutting blade exceeds 0.5 mm, there exists a tendency for sufficient favorable cutting property not to be obtained, and when the thickness of a cutting blade is less than 0.05 mm, there exists a tendency for favorable cutting quality to be impaired.

FIG. 8: is a schematic cross section of the laminated part of the packaging container with which the cutting blade which concerns on one Embodiment of this invention was attached to the back surface of the cover front face wall through the sealant material which is resin. In the lamination | stacking part 50 of the packaging container, the sealant material 54, the contact bonding layer 52, and the cutting blade 24 are laminated | stacked in this order on the back surface 22a of the cover front surface wall 22. As shown in FIG. The cutting edge 24 bonded to the sealant material 54 containing ethylene methacrylic acid copolymer as a main component by a polyurethane-based adhesive (adhesive layer 52) is the sealant material 54 and the front face of the packaging container cover. It adheres to the back surface 22a of the front surface wall of a packaging container by sticking the back surface 22a of the by a ultrasonic bonding method. In this way, the cutting blade 24 attached to the rear face 22a of the front face wall of the packaging container via the sealant material 54 is fixed to the packaging container cover by sufficient adhesive force, so that it is not easily peeled off from the packaging container cover. .

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

According to the present invention, it is possible to provide a cutting blade having good cutting property and sufficiently excellent feeling and durability at cutting, and a packaging container having such cutting blade.

10: packing container
12: branch pipe
14: wrap film
16: container body
18: cover
20: normal edge of the rear face wall of the container body
22: front wall of the cover
22a: back side
24, 24a, 24b, 24c: cutting blade
26: base of the front wall of the container body
28: center area
29, 29a, 29b: middle area
30, 30a, 30b: side area
31: Middle 1st (middle)
32: Middle 2nd teeth (middle teeth)
33: side value (side value)
34: side replacement (side teeth)
35: Sochi
36: Medium value (second value)
38: replacement (first tooth)
39, 40: side teeth
50: laminated part
52: adhesive layer
54: sealant material

Claims (12)

In the non-metallic V-shaped cutting blade which has a plurality of teeth which is attached to the packaging container which accommodates a roll-shaped package, and cut | disconnects the said roll-shaped package,
A central area including a V-shaped vertex, a pair of side areas each including one of both ends of the V-shape, and a pair of intermediate areas respectively disposed between the pair of side areas and the central area,
The central area is,
Has a plurality of first teeth having the highest tooth height and the same tooth height, and a plurality of second teeth having the same tooth height and lower than the first tooth,
One of the plurality of first teeth is disposed on the vertex, and the other first teeth are arranged at predetermined intervals about the first tooth of the vertex,
The second tooth is disposed between the first tooth,
A first straight line connecting the teeth of the first tooth, a second straight line connecting the teeth of the second tooth and a third straight line connecting the roots of the first tooth and the second tooth are parallel to each other, the second straight line Is located between the first straight line and the third straight line,
The intermediate area,
It has a plurality of intermediate teeth, the tooth tip of the intermediate tooth is located on the second straight line or between the second straight line and the third straight line,
The side area is,
The cutting edge for packaging containers which has a some side tooth, and this end of the said side tooth is located on the said 2nd straight line or between the said 1st straight line and the said 2nd straight line. The cutting blade for packaging containers according to claim 1, wherein at least one tooth tip of the plurality of side teeth faces outwardly from the teeth tip of the first tooth, the second tooth, and the intermediate tooth. The cutting edge for a packaging container according to claim 1, wherein the tooth height of the side teeth is equal to or higher than the second tooth and lower than the first tooth. delete The cutting blade for packaging containers according to any one of claims 1 to 3, wherein the intermediate area has two kinds of small and medium intermediate teeth having alternately disposed tooth heights. The cutting blade for packaging containers according to any one of claims 1 to 3, wherein the tooth height of the intermediate tooth is equal to or lower than the second tooth. The inclined side in at least one of the said 1st tooth, the said 2nd tooth, the said intermediate | middle tooth, and the said side tooth becomes an arc-shaped concave inwardly in any one of Claims 1-3. Cutting blade for packaging containers. The packaging container provided with the cutting blade in any one of Claims 1-3 on the back surface of the front surface wall of a cover. The packaging container according to claim 8, wherein the cutting blade is attached to the rear face of the front face wall of the lid via a modified polyethylene resin. The cutting edge for a packaging container according to any one of claims 1 to 3, wherein the side area has two kinds of side teeth having different teeth heights alternately arranged. The packaging container provided with the cutting blade of Claim 10 in the back surface of the front surface wall of a cover. The packaging container according to claim 11, wherein the cutting blade is attached to the rear surface of the front wall of the lid via a modified polyethylene resin.

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