JP2007302346A - Container for package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container for a package capable of easily and surely cutting a rolled packaged matter such as a wrapping film, and preventing longitudinal splitting of the packaged matter. <P>SOLUTION: The container is equipped with a container body for housing a rolled wrapping film, a lid body continuously turnably provided from a rear side wall of the container body, and a V-shaped saw-blade cutter 24 mounted to the tip end edge part of a front surface wall 22 of the lid body. The blade 28 positioned at the point closest to the bottom side of the container body at least in a closed state among the cutter blade has the radius of curvature R of the tip end of the blade of less than 100 μm, and the height of a burr at the tip end of the blade of less than 50 μm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging container for packaging a thin film body such as a wrap film, an aluminum foil, and paper wound around a cylindrical core in a roll shape, and more particularly to a cutter used for the packaging container.

  Conventionally, various types of wrap film containers are known, but many of them are made of cardboard, and are provided integrally with a container main body for storing a wrap film wound in a roll shape. And a lid. Moreover, what attached the saw blade-shaped cutter for cutting the wrap film pulled out from the container to the back surface of the front wall of a cover body is also common.

  When this type of container is used, the lid is lifted to expose the tip of the wrap film. And after picking and pulling out the film front-end | tip part with a finger | toe, a cover body is closed and the wrap film pulled out with the cutter is cut | disconnected.

  In addition, some cutters used in conventional wrap film containers have a V shape in which an intermediate portion is closer to the bottom of the container than both ends (see Japanese Patent Publication No. 4-19092). This is a shape for reliably and easily cutting by starting to cut the wrap film from the most protruding portion of the cutter.

  However, in the conventional wrap film container as described above, even if the cutter has a V shape, a large force is required to cut the wrap film, or the container is damaged as it is used. There was a case. In particular, in a container using a V-shaped cutter, when pulling out the wrap film, the wrap film may be caught by the most projecting blade in the middle part and split in the vertical direction (drawing direction). It was.

  This problem also exists in other containers that contain paper and aluminum foil.

  Accordingly, an object of the present invention is to provide a packaging container that can easily and reliably cut a roll-shaped packaged object such as a wrap film and can prevent vertical tearing of the packaged object. It is in.

  In order to achieve the above object, the present inventors have intensively studied, and as a result, paying attention to the shape of the most protruding middle blade of the V-shaped cutter, the tip thereof is a curved surface, and It was found that burrs were formed (see FIGS. 2 and 3). The reason why such curved surfaces and burrs are formed is that the cutter is formed by punching. And from various experiments, the present inventors have found that the shape of the blade tip, in particular the radius of curvature of the tip and the height of the burr, are important factors that affect the ability to cut and longitudinally tear a packaged item, particularly a wrap film. I found out. At the same time, the radius of curvature of the most projecting intermediate blade of the conventional V-shaped cutter takes into account the durability of the blade (mold) used for the punching of the cutter, and the radius of curvature is larger than that of the present invention. It was found that the burr was large and large. This large burr is considered to cause the vertical tear.

  The present invention has been made on the basis of such knowledge, and can be rotated from a container main body for storing an object to be packaged such as a wrap film wound in a roll, aluminum foil, paper, and the rear wall of the container main body. A continuous lid and a saw blade-like cutter attached to the front edge of the front wall of the lid, and in the closed state, the middle portion is closer to the bottom of the container body than both ends. In a packaging container provided with a cutter having a shape or a V shape, at least the blade closest to the bottom of the container body in the closed state among the blades of the cutter, the radius of curvature (R ) Is less than 145 μm and the burr height (H) at the tip of the blade is less than 50 μm.

At the same time, it is characterized by satisfying the following requirement (1).
(1) Of the blades of the cutter, the blade closest to the bottom of the container body in the closed state has a radius of curvature (R) at the tip of less than 100 μm.

  In this way, by limiting the curvature radius of the blade tip and the height of the burr to a certain range, good cutting properties can be obtained, and the problem of vertical tearing of the package is also eliminated.

  In addition, when the package is a wrap film made of polyvinylidene chloride, the above numerical range is particularly effective.

  According to the container according to the present invention, it is possible to easily cut a roll-shaped package such as a wrap film, and the container does not suffer from defects such as deformation even when used repeatedly. In addition, when the wrap film or the like is pulled out, it is not cut off in the vertical direction.

  Moreover, when manufacturing the cutter of a container, although a press apparatus is used, when this press apparatus is used over a long period of time, since precision will fall by abrasion etc., a maintenance is needed. As a reference for judging the timing of the maintenance, it can be a time when the radius of curvature of the tip of the manufactured blade and the height of the burr deviate from the ranges defined in the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a container 10 to which the present invention is applied for packaging a roll-shaped wrap film made of polyvinylidene chloride as an article to be packaged. The container 10 is made from a piece of cardboard, preferably coated cardboard. As shown in FIG. 1, a container 10 includes a container main body 16 for storing a wrap film 14 wound around a cylindrical paper tube 12 in a roll shape, and a lid body provided integrally with the container main body 16. 18. When the lid is closed, the overall shape of the container 10 has a substantially rectangular parallelepiped shape.

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

  A saw blade-like cutter 24 for cutting the drawn wrap film 14 is attached to the back surface of the front wall 22 of the lid 18 with its blade edge protruding from the front edge of the front wall 22. Yes. In the illustrated embodiment, the front edge of the front wall 22 of the lid body has a convex shape or a V shape in which an intermediate portion is closer to the bottom 26 of the container body 16 than both ends, and the cutter 24 is also adapted to the shape. A V-shaped one is used. In the case of the container 10 employing such a V-shaped cutter 24, as shown in FIG. 1, the tip of the wrap film 14 is grasped with one hand, the container 10 is grasped with the other hand, and the thumb of the hand is held. Apply to the center of the lid front wall 22 and twist the container 10 in the front direction, that is, in the direction of arrow A. As a result, when the blade 28 at the midpoint of the V-shaped cutter 24 (the blade that protrudes most toward the bottom side 26) penetrates the wrap film 14, and the wrap film 14 is pulled as it is, the notches are left and right saw blades of the cutter 24. Propagating to the left and right of the wrap film 14 along 30, the wrap film 14 is cut.

  The cutter 24 is made of iron and is obtained by punching using an appropriate press device (not shown). The thickness is preferably in the range of 160 to 230 μm, more preferably in the range of 165 to 180 μm, and the Young's modulus is preferably in the range of 90 to 200 GPa, more preferably 130 to 170 GPa. The Young's modulus was measured using a Tensilon universal tester RTM-100, with a distance between marked lines of 100 mm, and pulled at a speed of 1 mm per minute, and using the first linear portion of the tensile stress-strain curve at that time. It is what I have sought.

  The shape of each blade 28, 30 of the cutter 24 is substantially V-shaped as clearly shown in FIG. 2, and the angle of each blade 28, 30 is preferably 50 to 70 degrees, more preferably 55 to 65 degrees. It is considered as a range. Further, the tips of the blades 28 and 30 are inevitably curved because the cutter 24 is formed by punching.

  The blades 28 and 30 of the cutter 24, particularly the blade 28 at the intermediate point, have a radius of curvature R at the tip of less than 145 μm.

  Moreover, the burr | flash 32 as clearly shown in FIG. 3 may be formed in the front-end | tip of each blade 28 and 30 by the relationship between the upper mold | type and lower mold | type of the press apparatus for cutter manufacture. For the blades 28 and 30, particularly the intermediate point blade 28, the height H of the burr 32 is less than 50 μm.

  In addition, in this specification, the numerical value about the curvature radius R of the front-end | tip of the blades 28 and 30 and the height H of the burr | flash 32 was measured and measured using the ultra deep shape measuring microscope VK-8500 by Keyence Corporation. Value.

  The reason why the radius of curvature R of the tip of at least the blade 28 of the cutter 24 is less than 145 μm is that when the blade has a radius of 145 μm or more, the so-called sharpness of the blade 28 is lost and the blade 28 slides on the wrap film 14. This is because it is difficult to penetrate the film 14.

  Further, the reason why the height H of the burr 32 of the blade 28 is less than 50 μm is that the amount of protrusion from the back surface of the cutter 24 is very small, so that when the wrap film 14 is pulled out from the container 10, This is because the wrap film 14 does not tear along the longitudinal direction (drawing direction) even if it contacts the back surface of the cutter 24.

  By the way, when the curvature radius R of the tip of the blade 28 is less than 100 μm, if the height H of the burr 32 is less than 50 μm, good results can be obtained even when the burr 32 is not formed at all. In the case where the radius of curvature R at the tip of the blade 28 is in the range of 100 μm or more and less than 145 μm, when the burr 32 is not formed, it is known from the experiments of the present inventors that the cutting performance is deteriorated. . On the other hand, if the burr 32 is formed and its height H exceeds a certain size, even if the curvature radius R is 100 μm or more, a good cutting property can be obtained. This is considered to be due to the following reason.

  That is, when the radius of curvature R is 100 μm or more, it is estimated that the area of the front end surface 34 of the blade 28 is increased and the sharpness enough to penetrate the wrap film 14 has already been lost, but the burr 32 is formed. This is because it is considered that the tip of the burr 32 can bite into the wrap film 14 and can prevent the blade 28 from slipping on the wrap film 14. That is, if the tip of the blade 28 does not move relative to the wrap film 14, the blade 28 can be pressed against one point of the wrap film 14, and the wrap film 14 can be penetrated with a relatively small force. It is.

  From this point of view, when the relationship between the curvature radius R and the height H of the burr 32 is specifically determined, the relationship H (μm) ≧ R (μm) −95 is established.

  The numerical limitations on the radius of curvature R and the height H of the burr 32 are preferably applied to all the blades 28 and 30 of the cutter 24, but may be applied only to the blade 28 at the intermediate point. In the case of the V-shaped cutter 24, the intermediate blade 28 is the starting point for cutting the wrap film 14, and if the wrap film 14 is penetrated by the blade 28, the state of the left and right blades 30 is compared to the blade 28. This is because cutting is easily performed even if it is somewhat inferior. Further, when pulling out the wrap film 14, the hand is placed at the position shown in FIG. 1, and therefore, the blade that causes the vertical rip of the wrap film 14 is almost always the mid-point blade 28.

  In such a configuration, when the wrap film 14 is cut by the cutting method as described above, the wrap film 14 can be cut with an extremely small force. In addition, since the force required for cutting is small, it is not necessary to hold the container 10 strongly, and problems such as damage or deformation of the container 10 do not occur even when used for a long time. Further, as described above, the problem of vertical tearing when the wrap film 14 is pulled out is also prevented.

  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, in the above-described embodiment, the packaging object of the container is a wrap film, but may be an aluminum foil, paper, or the like. Further, the shape of the cutter may be such that the intermediate portion is curved and protruded in an arc shape toward the bottom side 26 of the container 10.

  Moreover, it is thought that the numerical limitation in the said embodiment is effective also about a linear cutter.

  Next, the result of having performed the test of the cutting force required for the cutting | disconnection of a wrap film, and the sensory test about the various containers made as an experiment according to this invention is shown.

  In this test, a plurality of types of V-shaped cutters having different curvature radii (R) and burr heights (H) at the tips of the intermediate points were prepared. Each cutter is made of iron having a thickness of 170 μm and a Young's modulus of 164 GPa. Each cutter is a container used for the registered trademark “NEW Kurelap” manufactured and sold by Kureha Chemical Industry Co., Ltd. (Coated cardboard with a length of about 31 cm, a width of 4.5 cm, and a height of 4.5 cm) The wrap film made of polyvinylidene chloride, which was attached to the container and made in the container, was actually cut.

  Regarding the cutting force, a tensile test was performed using a Tensilon universal testing machine RTC-1210A manufactured by A & D Co., Ltd., and the tensile force was measured as the cutting force. In this case, as shown in FIG. 4, the angle θ formed by the blade at the midpoint of the V-shaped cutter and the wrap film is maintained at 60 degrees, and the container is placed at a position of about 6 mm from the tip of the blade to the container lid. The wrap film was cut at a pressing and pulling speed of 1000 mm / min.

  The reason for having an angle of 60 degrees is that when the angle formed by the blade and the wrap film is smaller than 60 degrees, the cutting force becomes a small value, so the change or difference in the cutting force due to the tip shape of the blade is small. This is because it becomes difficult to see the correlation between the shape of the tip and the cutting force. In the method of cutting the wrap film with a V-shaped cutter, the angle θ formed by the blade at the intermediate point and the wrap film does not become 20 degrees, and is usually cut at an angle larger than 20 degrees. Further, when the angle θ between the blade at the intermediate point and the wrap film is larger than 60 degrees, the cutting force becomes a large value, and the difference in the cutting force due to the shape of the blade tip increases, but the tension acting on the wrap film is large, and the wrap film As a result, a phenomenon such as being pulled out of the container occurs, resulting in a large variation in data. For this reason, the angle θ between the blade and the wrap film is set constant at 60 degrees.

  Also, in the sensory test, the examiner cuts the wrap film three times for the same container, and comprehensively considers the feel of sharpness and the required force at the time, and evaluates two types of good and bad Went.

  The results of this cutting force test and sensory test are as shown in Table 1 below. In Table 1, “◯” represents an evaluation that the sensory test is good, and “x” represents an evaluation that the sensory test is bad. Further, from the results of Table 1, a graph of the relationship between the curvature radius R of the blade, the cutting force, and the sensory evaluation is shown in FIG. 4, and a graph of the relationship between the curvature radius R of the blade, the burr height H, and the sensory evaluation is shown in FIG. Expressed in

表１、図４及び図５から、刃の先端の曲率半径が１００μｍ未満である場合には、常に、カット力が６００ｇｆという小さな値を示し、官能評価においても良好な結果が得られていることが分かる。

From Table 1, FIG. 4 and FIG. 5, when the curvature radius of the blade tip is less than 100 μm, the cutting force always shows a small value of 600 gf, and good results are obtained even in sensory evaluation. I understand.

  Further, FIG. 4 shows that when the radius of curvature is 100 μm or more, the cutting force exceeds 1200 gf, and the result of sensory failure appears. In FIG. 5, a certain relationship is recognized between when the sensory evaluation is good and when the sensory evaluation is bad. When the good region and the bad region are separated by a straight line, the above-described H (μm) ≧ R (μm) It was confirmed that the relationship of −95 was established.

  Moreover, while preparing five types of containers (Examples 1-5) comprised by this invention, preparing five types of containers (Comparative Examples 1-5) for reference examples 1-4 and a comparison. Evaluation tests were conducted on cutability, container maintenance, and longitudinal tearability.

  Each of the containers according to Examples 1 to 5, Reference Examples 1 to 4, and Comparative Examples 1 to 5 are made in the same manner as the containers made in the above cutting force test and sensory test. Moreover, each container differs only in the value of the curvature radius and burr | heap height of the front-end | tip of the blade in the intermediate point of a cutter.

  In the test of cutting property, the same test as the above-described cutting force test is performed, and the cutting force obtained by the test is 600 gf or more, and the cutting property is poor. A sample having a value of less than 600 gf was regarded as having good cutting properties, and “◯” was given in Table 2 below.

  When the cut property is determined based on 600 gf, it almost agrees with the result of the previous sensory test. Moreover, when cutting the wrap film with a force of 600 gf or more, the force for pulling the rub film increases and the force for pressing the lid also increases, so that the container is gripped with a stronger force. Since the damage / deformation in the vicinity of the part becomes large and it is difficult to use a wrap film having a predetermined length to the end, the value of the cutting force of 600 gf is set as a standard value of the cutting property.

  Further, the container maintainability test is performed in view of the fact that when a wrap film is pulled out from a container and cut, the force applied to the container increases in the case of a cutter with poor cutability, so that the container is damaged or deformed. It was decided. In this test, the rub film was pulled out from the container and cut repeatedly.Each time, the state of the container was observed, and a container that could not be cut to the end due to deformation of the container or the like was regarded as having poor container maintainability. In Table 2, “×” was given, and those that could be cut to the end made the container maintainability good, and in Table 2, “◯” was given.

  In the longitudinal tearability test, the wrap film is pulled out from the container while touching the blade at the middle point of the cutter, and the wrap film is observed for the occurrence of a longitudinal (drawing direction) incision. In Table 2, “×” was given, and “No” was given as “No” indicating that there was no longitudinal tearing.

  The results of each evaluation test are shown in Table 2.

この表２に示す通り、カッターの中間点における刃の先端の曲率半径（Ｒ）が１４５μｍ未満、バリ高さ（Ｈ）が５０μｍ未満である場合、そして、曲率半径（Ｒ）が１００μｍ以上である場合、Ｈ（μｍ）≧Ｒ（μｍ）−９５となっているとき、カット性及び容器維持性が共に良好であり、縦裂け性も無いことが確認された。

As shown in Table 2, the curvature radius (R) of the blade tip at the middle point of the cutter is less than 145 μm, the burr height (H) is less than 50 μm, and the curvature radius (R) is 100 μm or more. In this case, when H (μm) ≧ R (μm) −95, it was confirmed that both the cutability and the container maintainability were good and there was no longitudinal tearability.

  Further, in Comparative Examples 1 to 3, the relationship of H (μm) ≧ R (μm) −95 is not satisfied, but in this case, the cut property and the container maintainability are deteriorated. Further, from Comparative Examples 4 and 5, the cutting force is small due to the presence of burrs, and the cutability and container maintainability are good, but if the burrs are too large, vertical tearing occurs, which is not practical. I understood.

It is a perspective view which shows one Embodiment of the container for wrap films by this invention, and is a figure which shows a closed cover state. It is a top view which shows roughly the blade of the intermediate part of the cutter in the container of FIG. It is a schematic sectional drawing along the III-III line of FIG. It is a graph which shows the relationship between the curvature radius R of a blade, cutting force, and sensory evaluation. It is a graph which shows the relationship between the curvature radius R of a blade, the height H of a burr | flash, and sensory evaluation.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Packaging container, 12 ... Paper tube, 14 ... Wrap film, 16 ... Container body, 18 ... Lid, 22 ... Front wall of lid, 24 ... Cutter, 28 ... Midpoint blade, 30 ... Blade, 32 … Burr, 34… The tip of the blade.

Claims (2)

A container main body for storing a thin film body to be packaged wound in a roll shape, a lid body rotatably provided from the rear wall of the container main body, and a front edge of the front wall of the lid body In a packaging container provided with an attached saw blade-like cutter, and in the closed state, an intermediate portion thereof is closer to the bottom of the container body than both ends, and the cutter has a V shape or a convex shape. ,
Among the blades of the cutter, at least the blade closest to the bottom of the container body in the closed state has a curvature radius (R) of the blade tip of less than 100 μm, and the height of the burr at the blade tip A packaging container, wherein (H) is less than 50 μm.   The packaging container according to claim 1, wherein the package is a wrap film made of polyvinylidene chloride.

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