JP2002362547A - Wrapping material container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wrapping material container wherewith a rolled wrapping material such as a wrapping film can be severed easily and certainly and a longitudinal splitting can be prevented from occurring to the wrapping material. SOLUTION: For the container 10 comprising a container main body 16 for housing a rolled wrapping film 14, a cover body 18 extending from the rear side wall of the container main body so as to turn, and a V-shaped saw- toothed cutter 24 attached to the front edge of a front wall 22 of the cover body, a saw tooth 28 positioned at a point closest to the bottom side of the container main body when the cover body is closed is formed in a shape wherein the radius of curvature R at the front end of the saw tooth is set at 100 μm and above and less than 145 μm and the height H of a burr at the front end of the saw tooth is set at less than 50 μm, and the relation between the radius of curvature R and the height H of the burr at the front end of the saw tooth is set as H (μm)>=R (μm)-95.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container for packaging a thin film such as a wrap film, aluminum foil, or paper wound in a roll around a cylindrical core, and more particularly to a packaging container. It concerns the cutter.

[0002]

2. Description of the Related Art Conventionally, various types of wrap film containers are known, and most of them are made of cardboard, and a container body for storing a wrap film wound in a roll shape,
And a lid provided integrally with the container body. In general, a saw blade-shaped cutter for cutting the wrap film drawn from the container is attached to the back surface of the front wall of the lid.

When using this type of container, the lid is lifted to expose the tip of the wrap film. Then, after pinching the film tip with your finger and pulling it out, close the lid,
The wrap film pulled out by the cutter is cut.

Further, among cutters used for conventional wrap film containers, there is a V-shaped cutter whose intermediate portion is closer to the bottom of the container than both end portions (Japanese Patent Publication No. 4-1).
No. 9092). This is by starting to cut the wrap film from the most protruding part of the cutter,
This is a shape for reliably and easily performing cutting.

[0005]

However, in the conventional wrapping film container as described above, even if the cutter has a V-shape, a large force is required to cut the wrapping film, or the wrapping film cannot be used. In some cases, problems such as damage to the container may occur. Also, in particular,
In a container using a V-shaped cutter, when the wrap film was pulled out, the wrap film was caught on the most protruding blade in the middle portion, and the wrap film was sometimes torn in the vertical direction (drawing direction).

This problem also exists in other containers for storing paper and aluminum foil.

Accordingly, an object of the present invention is to provide a packaging container capable of easily and reliably cutting a roll-shaped package such as a wrap film and preventing the package from being longitudinally torn. To provide.

[0008]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies, and as a result, focused on the shape of the most protruding intermediate blade of the V-shaped cutter, Was curved and burrs were formed (see FIGS. 2 and 3). Such curved surfaces and burrs are formed because the cutter is formed by punching. The present inventors have found from various experiments that the shape of the tip of the blade, particularly the radius of curvature of the tip and the height of the burr, are important factors that affect the cutability and longitudinal tearing of the packaged object, especially the wrap film. I found that it was. At the same time, the radius of curvature of the most protruding intermediate blade of the conventional V-shaped cutter has a radius of curvature that is smaller than that of the present invention in consideration of the durability of the blade (die) used for punching of the cutter. It was found that it was large and had large burrs. It is considered that the large burrs cause vertical tearing.

The present invention has been made based on this finding, and includes a container main body for storing an object to be packaged such as a wrap film, aluminum foil, and paper wound in a roll, and a container main body for rotating the container main body from a rear wall. A lid connected movably,
A saw blade-shaped cutter attached to the front edge of the front wall of the lid, the intermediate part of which has a convex shape or a V-shape that is closer to the bottom of the container body than both ends in the closed state. In a packaging container provided with a cutter, at least the blade closest to the bottom of the container body in the closed state among the blades of the cutter has a radius of curvature (R) at the tip of the blade of less than 145 μm, Is characterized in that the height (H) of the burr at the tip of is less than 50 μm.

In addition, the present invention is characterized by satisfying the following requirement (1) or (2). (1) Among 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) of 1 at its tip.
Less than 00 μm. (2) Among the cutter blades, the radius of curvature (R) of the tip of the blade closest to the bottom of the container body in the closed state is 100 μm.
m and less than 145 μm, the radius of curvature (R) and the height (H) of the burr at the tip of the blade have the following relationship: H (μm) ≧ R (μm) −95 That you are.

As described above, by limiting the radius of curvature of the blade tip and the height of the burr to a certain range, good cutting properties can be obtained, and the problem of longitudinal tearing of the packaged object can be solved. .

When the object to be packaged is a wrap film made of polyvinylidene chloride, the above numerical range is particularly effective.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

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

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

On the back surface of the front wall 22 of the lid 18, a saw blade-shaped cutter 24 for cutting the drawn wrap film 14 is provided in a state where the cutting edge protrudes from the front edge of the front wall 22. Installed. In the illustrated embodiment, the tip edge of the lid front wall 22 has a convex shape or a V-shape in which the middle portion is closer to the bottom 26 of the container body 16 than both ends, and the cutter 24 is also adapted to that shape. A V-shape is used. In the case of the container 10 employing such a V-shaped cutter 24, as shown in FIG.
With one hand holding the leading end of the wrap film 14 and the other hand holding the container 10, the thumb of the hand is applied to the center of the lid front wall 22, and the container 10 is moved forward, that is, in the direction of arrow A. Twist. Thereby, the V-shaped cutter 24
Of the wrap film 14 along the saw blades 30 on the left and right sides of the cutter 24 when the blade 28 at the intermediate point (the blade projecting most toward the base 26) penetrates the wrap film 14 and pulls the wrap film 14 as it is. Propagating to the left and right, the wrap film 14 is cut.

The cutter 24 is made of iron, and is obtained by punching using a suitable press device (not shown). Its thickness is preferably 160-230 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 the distance between marked lines set to 100 mm, and pulled at a rate of 1 mm per minute, using the first straight line portion of the tensile stress-strain curve at that time. It is what I sought.

The shape of each blade 28, 30 of the cutter 24 is as follows.
As is clearly shown in FIG. 2, each blade 28, 3 is substantially V-shaped.
The angle of 0 is preferably 50 to 70 degrees, more preferably 5 degrees.
The range is 5 to 65 degrees. In addition, each blade 28, 30
Is necessarily curved because the cutter 24 is formed by punching.

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

In addition, due to the relationship between the upper and lower dies of the cutter manufacturing press device, burrs 32 as shown in FIG. Blade 2
The height H of the burr 32 is set to be less than 50 μm for the blades 8 and 30, particularly at the intermediate point.

In this specification, numerical values of the radius of curvature R at the tip of the blades 28 and 30 and the height H of the burr 32 are indicated by an ultra-depth shape measuring microscope VK manufactured by Keyence Corporation.
This is a value measured and measured using -8500.

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

The height H of the burr 32 of the blade 28 is set to 50 μm.
The reason is that the protrusion amount from the back surface of the cutter 24 is extremely small, so that even when the wrap film 14 is in contact with the back surface of the cutter 24 when the wrap film 14 is pulled out from the container 10, This is because the wrap film 14 does not tear along the vertical direction (drawing direction).

The radius of curvature R at the tip of the blade 28 is 1
If less than 00 μm, the height H of the burr 32 is 50 μm
If the radius is less than the above, good results can be obtained even when the burr 32 is not formed at all. However, when 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, the burr 32 is formed. If not, it is known from experiments by the present inventors that the cut property is deteriorated. On the other hand, if the burr 32 is formed and the height H exceeds a certain size, good cut properties can be obtained even if the radius of curvature R is 100 μm or more. This is considered to be due to the following reasons.

That is, when the radius of curvature R is 100 μm or more, it is presumed that the area of the distal end surface 34 of the blade 28 becomes large and the sharpness enough to penetrate the wrap film 14 has already been lost. This is because it is considered that, when the ridges 32 are formed, the tips of the burrs 32 bite into the wrap film 14 and can prevent the blade 28 from sliding on the wrap film 14. That is, if the tip of the blade 28 does not relatively move with respect 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 radius of curvature R and the height H of the burr 32 is specifically determined, the following relationship holds: H (μm) ≧ R (μm) −95.

The above numerical limitation of the radius of curvature R and the height H of the burr 32 is preferably applied to all the blades 28 and 30 of the cutter 24, but may be applied only to the intermediate blade 28. This is because, in the case of the V-shaped cutter 24, the blade 28 at the intermediate point becomes the starting point of cutting the wrap film 14, and when the wrap film 14 is penetrated by the blade 28, the state of the left and right blades 30 is smaller than that of the blade 28. This is because the cutting is easily performed even if it is somewhat inferior. Further, when the wrap film 14 is pulled out, the hand is placed at the position shown in FIG. 1, so that the blade causing the vertical tear of the wrap film 14 is almost always the blade 28 at the intermediate point.

In such a configuration, when the wrap film 14 is cut by the above-described cutting method, the wrap film 14 can be cut with an extremely small force. Further, since the cutting force is small, the container 10
Does not need to be gripped strongly, and even if used for a long period of time, there is no problem such as the container 10 being damaged or deformed. Further, as described above, the problem of vertical tearing when the wrap film 14 is pulled out is also prevented.

Although the preferred embodiments of the present invention have been described in detail, it goes without saying that the present invention is not limited to the above embodiments. For example, in the above embodiment, the object to be packaged in the container is a wrap film, but may be aluminum foil, paper, or the like. Further, the shape of the cutter may be such that the intermediate portion is curved and protrudes in an arc shape toward the bottom 26 of the container 10.

Also for a linear cutter, the numerical limitation in the above embodiment is considered to be effective.

[0031]

EXAMPLES Next, the results of a test of a cutting force required for cutting a wrap film and a sensory test of various containers produced in accordance with the present invention will be described.

In this test, a plurality of V-shaped cutters were prepared in which the radius of curvature (R) of the tip of the blade at the intermediate point and the height (H) of the burr were changed. Each cutter has a thickness of 170 μm,
It is made of iron with a Young's modulus of 164 GPa. In addition, each cutter is a container (about 31 cm long, 4.5 cm wide, 4.5 cm high coated cardboard) used for the registered trademark "NEW Clerap" manufactured and sold by Kureha Chemical Industry Co., Ltd. The wrap film made of polyvinylidene chloride contained in the container was actually cut.

Regarding the cutting force, Tensilon universal tester RTC-1210A manufactured by A & D Corporation was used.
Was used to perform a tensile test, and the tensile force was measured as a cutting force. In this case, as shown in FIG. 4, the angle θ between the blade at the intermediate point of the V-shaped cutter and the wrap film is set to 60.
At a position of about 6 mm from the tip of the blade to the lid of the container, and the pulling speed is 1000 mm / min.
Cut the wrap film.

The reason for providing the angle of 60 degrees is that when the angle between the blade and the wrap film is smaller than 60 degrees, the cutting force is a small value. This is because it is difficult to see the correlation between the tip shape of the blade and the cutting force. In the method of cutting a wrap film with a V-shaped cutter, the angle θ between the blade at the intermediate point and the wrap film does not become 20 degrees, but is usually cut at an angle larger than 20 degrees.
Furthermore, the angle θ between the blade at the intermediate point and the wrap film is 60
If it is greater than the degree, the cutting force will be a large value, and the difference in cutting force due to the tip shape of the blade will be large, but the tension acting on the wrap film will be large, causing phenomena such as the wrap film being pulled out of the container, causing large variations in data. Become. For such a reason, the angle θ between the blade and the wrap film was set to be constant at 60 degrees.

In the sensory test, the examiner cut the wrap film three times for the same container three times, and comprehensively considered the feeling such as sharpness and the required force at that time. Kind evaluation was performed.

The results of the cutting force test and the sensory test are as shown in Table 1 below. In Table 1, "○" indicates that the sensory test was good, and "x" indicates that the sensory test was bad. Also, from the results in Table 1, a graph of the relationship between the radius of curvature R of the blade, the cutting force, and the sensory evaluation is shown in FIG. 4, and a graph of the relationship between the radius of curvature R of the blade, the height H of the burr, and the sensory evaluation is shown in FIG. It was expressed in.

[0037]

[Table 1] From Table 1, FIG. 4 and FIG. 5, the radius of curvature of the tip of the blade is 100.
When it is less than μm, the cutting force is always 600 gf
It can be seen that good results were obtained also in the sensory evaluation.

FIG. 4 shows that the radius of curvature is 100 μm.
If it is above, the cutting force exceeds 1200 gf,
It can also be seen that a result of sensory failure has also appeared. In FIG. 5, a certain relationship is recognized between a case where the sensory evaluation is good and a case where 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) -95 was established.

Further, nine kinds of containers (Examples 1 to 9) constituted according to the present invention were prepared, and five kinds of containers were prepared for comparison.
Various types of containers (Comparative Examples 1 to 5) were prepared, and an evaluation test was performed on cutability, container retention, and longitudinal tearability.

Each of the containers according to Examples 1 to 9 and Comparative Examples 1 to 5 was produced in the same manner as the containers produced by the above-mentioned cutting force test and sensory test. Also, each container differs only in the value of the radius of curvature and burr height of the tip of the blade at the midpoint of the cutter.

In the cutability test, a test similar to the above-described cut force test was performed.
Samples with a cutout of at least 00 gf were judged to be poor in cuttability. In Table 2 below, "x" was assigned. When the measured value was less than 600 gf, cuttability was judged to be good. In Table 2 below, "o" was assigned.

When the cut property is judged on the basis of 600 gf, the result almost agrees with the result of the above-mentioned sensory test. Also,
When cutting the wrap film with a force of 600 gf or more, the force of pulling the rub film increases, and the force of pressing the lid also increases, so the container is grasped with a stronger force, and the vicinity of the central portion of the container The wrap film of a predetermined length becomes difficult to use to the end because the damage and deformation of the
The value of 0 gf was used as a standard value of the cut property.

Further, the test for maintaining the container shows that when the wrap film is pulled out from the container and cut, a cutter having poor cutting properties is liable to be damaged or deformed due to a large force applied to the container. I decided to do that in light of this. In this test, pull out the rub film from the container and repeat cutting, and in each case, observe the condition of the container, and if the wrap film could not be cut to the end due to deformation of the container, etc. In Table 2, "x" was given, and those that could be cut to the end had good container maintainability, and in Table 2, "o" was given.

In the vertical tearing test, the wrap film was pulled out from the container so as to touch the blade at the intermediate point of the cutter, and the wrap film was observed for the occurrence of a cut in the vertical direction (drawing direction). In Table 2, "x" was given as having vertical tearing property, and "o" was given in Table 2 as not having vertical tearing property.

Table 2 shows the results of each evaluation test.

[0046]

[Table 2] As shown in Table 2, the radius of curvature (R) of the tip of the blade at the intermediate point of the cutter is less than 145 μm, and the burr height (H)
Is less than 50 μm, and when the radius of curvature (R) is 100 μm or more, H (μm) ≧ R (μm) −
When it was 95, it was confirmed that both the cut property and the container maintainability were good and there was no longitudinal tearing property.

In Comparative Examples 1 to 3, H (μm) ≧ R
Although the relationship of (μm) −95 is not satisfied, in this case, the cut property and the container maintainability are deteriorated. Also, from Comparative Examples 4 and 5, the presence of the burr required a small cutting force, and the cutability and container maintainability were good. However, if the burr was too large, vertical tearing occurred, which was not practical. I understood.

[0048]

As described above, according to the container of the present invention, it is possible to easily cut a roll-shaped packaged object such as a wrap film. Does not occur. In addition, when the wrap film or the like is pulled out, there is no possibility that the film is torn in the vertical direction.

When a cutter for a container is manufactured, a press device is used. However, if this press device is used for a long period of time, the accuracy will decrease due to abrasion or the like, so that maintenance is required. A criterion for determining the maintenance time may 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 by the present invention.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a wrap film container according to the present invention, showing a closed state.

FIG. 2 is a plan view schematically showing a blade at an intermediate portion of a cutter in the container of FIG.

FIG. 3 is a schematic sectional view taken along line III-III in FIG. 2;

FIG. 4 is a graph showing a relationship among a radius of curvature R of a blade, a cutting force, and a sensory evaluation.

FIG. 5 is a graph showing a relationship among a radius of curvature R of a blade, a height H of a burr, and a 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 ... Middle point blade, 30 ... Blade, 3
2: Burr, 34: Tip surface of blade.

Continued on front page F-term (reference) 3E014 MC06 3E060 AA03 BA13 BC04 DA30 EA08 EA14

Claims (3)

[Claims] 1. A container body for storing a thin-film packaged object wound in a roll shape, a lid rotatably connected to a rear wall of the container body, and a front wall of the lid. A blade-shaped cutter attached to the leading edge of the container, the middle portion of which is closer to the bottom of the container body than both ends in the closed state, and has a V-shaped or convex shape. In the packaging container provided, among the blades of the cutter, at least the blade closest to the bottom of the container body in the closed state has a radius of curvature (R) of a tip of the blade of 100 μm or more and less than 145 μm; The height (H) of the burr at the tip of the blade is less than 50 μm, and the radius of curvature (R) and the burr height (H) at the tip of the blade are H (μm) ≧ R (μm) −95 Use container. 2. A container body for accommodating a thin-film packaged object wound in a roll shape, a lid rotatably connected to a rear wall of the container body, and a front wall of the lid. A blade-shaped cutter attached to the leading edge of the container, the middle portion of which is closer to the bottom of the container body than both ends in the closed state, and has a V-shaped or convex shape. In the packaging container provided, among the blades of the cutter, at least a blade closest to a bottom side of the container body in a closed state has a radius of curvature (R) of a tip of the blade less than 100 μm, A packaging container, wherein a height (H) of a tip burr is less than 50 μm. 3. The packaging container according to claim 1, wherein the object to be packaged is a wrap film made of polyvinylidene chloride.