JPH08318935A - Wrapping film housing box - Google Patents

Abstract

PURPOSE: To suppress the generation of cracks at the end of a cut film while keeping the cutting capability possessed by a conventional article by a method wherein the dimensions of respective parts of the ridge parts and the shape of valley parts for a saw blade to cut a wrapping film being pulled out from a box body, and the length of a thin film state which exists between a surface of the box body and the surface of the saw blade are respectively specified. CONSTITUTION: A wrapping film is pulled out from a rolled film which is housed in a housing chamber, and a required quantity of the wrapping film is cut by a metal blade which is fixed by caulking claws at the leading end of a covering lid piece. In this case, for the saw blade, the height of the ridge part is set at 0.60-0.40mm, the tilting angle of the ridge part is set at 55-65 degrees, and a pitch between the ridge parts is set at 1.46-0.72mm respectively, and at the same time, the shape of a valley of the saw blade is formed into a flat shape with a length of 0.30-0.70mm. Then, the shape of the tip of the ridge part is formed into arc shapes which are different at both ends and at the center. At the same time, the arcs are set at 0.02-0.05mm at both ends and at 0.05-0.08mm at the center, respectively. In the meantime, a thin film state which has the same width with the saw blade and is made to exist between the surface of a box body and the surface of the saw blade under a state wherein its end protrudes from the end of the saw blade is arranged only in an area which extends to 3-8% of the length of the saw blade from the side end of the saw blade.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] The present invention relates to an improved technique for a wrap film storage box that is generally used for direct packaging of foods in general households and food sales businesses.

[0002]

2. Description of the Related Art Conventionally, a columnar box as shown in FIG. 5 and a winding film housed in a box storage chamber are used. A required amount of wrap film is drawn from the winding film and the drawn film is put in a box. A wrap film storage box to be used by cutting along the saw blade with the teeth of a long metal saw blade that has been deployed, wherein the metal saw blade has a thin film body having the same width as the saw blade,
A wrap film storage box is known in which the edge of the thin film-like body is interposed between the saw blade surface and the box surface and is fixed to the box with a crimping claw in a state of protruding from the saw blade end (for example, Japanese Patent Laid-Open Publication No. Hei 10 (1999) -242242). 6
No. 56149), and is widely marketed.

Various columnar boxes are known, for example, a columnar shape and a polygonal columnar shape having a triangular shape to an octagonal shape. The wrap film storage box of FIGS. 5 (A) and 5 (B) exemplifies a case where the wrap film storage box is widely sold and is a general-purpose quadratic prism-shaped wrap film storage box. The front plate 1, the bottom plate 2, and the rear plate are illustrated. 3, and a rectangular storage chamber 13 formed by the side plate 8 and having an upper opening, a lid plate 4 connected from the side edge of the rear plate 3 of the storage chamber 13 in a direction to cover the storage chamber opening, and the lid plate thereof. 4 is a rectangular box body having a cover lid piece 5 extending from the side edge of 4 in a direction to cover the front plate 1, and is a winding film R stored in a storage chamber 13.
The required amount of the wrap film F is pulled out from the wrapping film F, and the teeth of the long metal saw blade K fixed and deployed by the crimping tool 12 along the longitudinal direction of the box body at the tip of the covering lid piece 5 along the saw blade. It is a wrap film storage box that is used after being cut.

Most of the boxes of this type are made of paperboard and are formed by bending the plate surfaces of the respective parts at substantially right angles at the respective folding line portions, and extend from the cover plate 4 to the side plate 8. It is a case where the side cover lid piece 11 is provided or a case where the side cover lid piece 11 is not provided. In addition, the overall shape of the saw blade (the shape of the virtual line connecting the cutting edges) is known to be straight, concave, convex, V-shaped, trapezoidal, etc. Has been.

FIG. 5 (A) shows a stage in which the unsealing piece 6 is cut and removed by the cutting line 10 while the peeling of the part of the local joint portion 9 is being proceeded from the storage box to open the unsealing piece. It is a figure which shows the step which opened and pulled out the wrap film F. The thin film body plays a role in safely and easily peeling the saw blade from the box when discarding it as an empty box. Figure 5
In the protruding portion P of the thin film-shaped body drawn at the end of the saw blade K in (B), the thin film-shaped body interposed between the saw blade and the box body (paperboard) projects from the saw blade end portion. It shows the part where the saw blade is peeled off, and also serves as a handle when peeling off, which also serves as a sign that tells the consumer where to start peeling off the saw blade. Since this thin film is cut with a die together with a metal thin plate that serves as a saw blade, it has the same width as the saw blade and has the same tooth profile, which does not hinder the cutting of the wrap film and adjusts the caulking strength of the saw blade. There are advantages. Therefore, it has been highly evaluated in the market that the saw blade can be easily and safely removed from the box while maintaining the cutting performance.

[0006] The cutting method using this type of commercially available storage box is roughly classified into three types, commonly known as "lifting cut", "horizontal opening cut", and "center rotation cut". That is, in any of these cutting methods, the path of the drawn wrap film F passes between the front surface of the front plate 1 and the back surface of the covering lid piece 5 in the state where the lid is first covered, and the film is the tip of the covering lid piece 5. The cutting edge of the cutting tool is bent almost at a right angle, its film end is guided toward the horizontal direction perpendicular to the cover piece, and the braking force by holding the longitudinal center of the surface of the cover piece 5 with the thumb is used. It is common that tension is applied to the film between the hand holding the edge of the film and the film, and the tooth tip is cut into the film by the tension. In this case, the method of applying the tension is different, and (I) the angle between the film between the front plate 1 and the covering lid piece 5 and the film end side becomes an acute angle of 45 degrees or less. By the relative twisting motion of the hand holding the box and holding the box and the hand holding the film end, the film contacting the tooth tips sequentially contacts from the one end of the saw blade to the other end. Applying tension to the film, and sequentially cutting from one end of the film width to the other end
(II) A wrist holding the box so that the horizontal relationship between the box and the guided film is maintained, and the longitudinal end of the box draws an arc in the horizontal direction around the longitudinal one end side of the box. Is applied horizontally to spread the film horizontally to cut the film sequentially from one end of the width to the other end.
II) While maintaining the horizontal relationship between the above box and the guided film, rotate the box being held downward with the wrist,
3) "Center rotation cutting" in which tension is applied to the film at the tip of the tooth and the film is cut sequentially from the center of the film width toward both ends
It can be classified into species. All of these three cutting methods are long metal saw blades that are arranged almost all over the longitudinal direction of the box part, and the film is cut at the tips of the saw blades, and the film is cut into the shape of the saw blade. It seeks to take advantage of the fact that it is cut exactly along. Therefore, the suitability according to the overall shape of the saw blade adopted, that is, the saw blade with a V-shaped overall shape, is extremely excellent for "central rotary cutting", but the other two methods are somewhat unsuitable. Therefore, a straight cutting tool with a flat overall shape is excellent for "lifting cut" and "horizontal opening cut", but "center rotation cut" is a little weak, and the shape applicability is somewhat. Although there are three types of cutting methods, metal saw blades have a high level of cutting performance (performance due to the characteristics of the material) that cannot be reached with paper or plastic saw blades. Therefore, there is an advantage that a cutting method suitable for consumers' taste can be provided.

[0007] Further, consumers are strongly interested in the cutting sound generated when the wrap film is cut. That is, the consumer
The cutting sound of metal saw blades that I've been accustomed to for many years has a refreshing feeling, and the cutting sound of paper and plastic saw blades, which is distinctly different from the cutting noise of metal saw blades, feels strange. In addition, it has been found from practical monitor surveys that even a metal saw blade tends to feel uncomfortable unless it has a cutting sound that has been familiar for many years. In other words, the cutting sound is now one of the qualities required for the cutting performance of wrap film cutting tools.

[0008] That is, against the tide when some saw blades of commercially available wrap film storage boxes began to be changed to paper saw blades or plastic saw blades, the long metal saw blades were still used. The reason for this is that in the commercially available wrap film market, which requires an unspecified number of people to always maintain accurate and reliable high cutting performance with their favorite cutting method, It is based on the judgment of the market research result that the above-mentioned high market demand cannot be satisfied with the paper saw blades and plastic saw blades whose basic characteristics such as hardness and rigidity cannot be satisfied above. . In the current commercial storage box, the height of the tooth crest (distance between the virtual line of the top of the mountain and the virtual line of the bottom of the valley) is about 1.0 mm, and the inclination angle of the tooth crest (between the ridge lines of the mountain). The angle) is about 60 degrees, the pitch of the tooth peaks (distance between virtual lines of the center of the mountain) is about 1.16 mm, and the radius of the arc formed at the tip of the tooth peak is about 0.1 mm. A saw blade is used. The shape design of the tooth flanks of this saw blade is carefully selected from the viewpoint of ensuring safety without damaging fingers etc. and ensuring high cutting performance, and maintaining its durability and cutting noise. Since the process control is performed with the utmost care, it is used with a high evaluation that the consumer is "extremely excellent" in terms of the sharpness of the film (high cutting performance and sustainability of the performance). -ing

In this type of storage box, a temporary holding portion Q of the film is arranged on the surface of the front plate 1 covered with the covering lid piece 5. The role of the temporary holding portion Q of the film is a rewinding prevention function for preventing the cut end of the pulled out film from being rewound into the box due to the bouncy at the time of cutting (the next pulling out becomes difficult). Is.

[0010]

However, in recent years, such a storage box suffers from a defective phenomenon that the film is torn in the vertical, horizontal, and diagonal directions (that is, unintended directions).
This defective phenomenon is common in, for example, a wrap film made of vinylidene chloride resin having a wall thickness of 8 to 15 μm. In the situation where a defective occurs, the film end locked to the temporary fastening portion Q is peeled off to When attempting to pull out the film, the film is moved in the longitudinal, lateral, or diagonal direction (that is, in an unintended direction) from the part of the tooth crest (the mark of the crest) that is attached to the edge of the film to be peeled off. Ripped and ran,
It is difficult to pull out the next film. The reason for making this phenomenon noticeable is that the recent measures that enhance the locking ability of the temporary fastening portion Q are as a measure to completely prevent the phenomenon that the cut end portion of the drawn film rewinds into the box. The reason is that it was difficult to peel off the film that was locked to. If, however, the locking ability of the temporary fastening portion Q is lowered to facilitate peeling off of the film, the phenomenon that the cut end of the film rewinds increases, so that a defective phenomenon of the film tearing and running in an unintended direction occurs. The place is simply to move the place of occurrence from the temporary fastening part Q to the surface of the winding film R (that is, peeling off the cut end of the film that is in close contact with the surface of the winding film). Absent.

As a proposal for preventing the film from being obliquely cut, there is, for example, the invention disclosed in Japanese Patent Laid-Open No. 6-293335. In this proposal, the tear strength is 2 to 100 gr, and the ratio of the strength in the length and width is 1.5 or more. The winding film with weakened tear strength in the (width) direction is housed in a storage box with a saw blade only at the longitudinal end of the box, and a slit is made with the saw blade only on the side of the drawn film. The content is to tear (cut) the film in the lateral (width) direction by tear propagation from the cut, and in that case, there is no saw blade mark on the edge of the film, so the occurrence of diagonal cutting can be prevented and As the tear strength in the direction is weakened, the effect of facilitating the cutting (tearing) is effective. Therefore, for the purpose of avoiding the uncertainty of the technology of tearing the film in the lateral (width) direction by tear propagation (the problem that the shape of the cutting edge is uneven), we aimed to cut along the teeth of a long saw blade. If
In the above-mentioned proposal of the above-mentioned Japanese Patent Laid-Open, in which the film is cut by the propagation of tearing, the object is different. Furthermore, there is no suggestion of cutting along the teeth of a long saw blade for the purposes of the present invention.

It should be noted that references to paper saw blades and plastic saw blades, which have many proposals regarding tooth flank design, are not cited. The reason is that the object of the present invention is to solve the problem that occurs in the conventional (current) long metal saw blade by changing the design of the tooth crests of the same long metal saw blade. In contrast to the paper saw blades and plastic saw blades, the literature does not compensate for the handy that occurs due to the characteristics of the material compared to metal in some cases. It is just a matter of approaching the cutting performance of metal saw blades as much as possible, the problem to be solved is different, and the level of cutting performance of the obtained tooth crest design is completely different (low),
This is because the content has nothing to do with the present invention.

In view of the above situation, an object of the present invention is to ensure that a metal saw blade can be safely and easily peeled off from a box and that a finger currently held by a commercially available metal saw blade is not damaged. Of the film and the high cutting performance are ensured and the durability and cutting sound are balanced on all four sides. After cutting, the film is cut vertically, horizontally or diagonally (that is, in an unintended direction). An object of the present invention is to provide a wrap film storage box capable of suppressing the occurrence of the phenomenon of tearing.

[0014]

The structure of the present invention for solving the above problems is a columnar box, a winding film housed in a box storage chamber, and a long metal saw blade provided in the box. The metal saw blade comprises a thin film body having the same width as the saw blade,
In a wrap film storage box in which the edge of the thin film body is interposed between the saw blade surface and the box body surface in a state of protruding from the saw blade edge and fixed to the box by caulking claws, the metal saw blade is ,
The thin film-like body that satisfies the following conditions a to e and that is interposed between the saw blade surface and the box surface is 3 from the side edge of the saw blade to the saw blade length. It is characterized in that it is arranged only in the length portion in the range of 8% to 8%. [Conditions for metal saw blade] a. Height of tooth crest: range of 0.60 mm or less and 0.40 mm or more b. Inclination angle of tooth crest: range of 55 degrees or more and 65 degrees or less c. Pitch between teeth: range of 1.46 mm or less and 0.72 mm or more d. Shape of valley portion between adjacent tooth peaks: forming a flat shape having a length in the range of 0.30 mm or more and 0.70 mm or less e. Tip shape of tooth crest: The tooth crest located at both longitudinal end portions of the saw blade and the tooth crest located at the central portion in the longitudinal direction are formed in different arc shapes, and the arc shape defines the inclination angle of the tooth crests. When it is shown by a circular arc of a circle that can be drawn in contact with both ridgelines of the tooth peak centering on an imaginary line that divides equally, the tooth peaks located at both ends in the longitudinal direction are circular arcs with a radius of 0.02 mm to 0.05 mm,
The tooth crest located at the central portion in the longitudinal direction is an arc of a circle having a radius of more than 0.05 mm and 0.08 mm or less.

The contents of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a partial schematic view showing an enlarged tooth peak of a saw blade according to an embodiment of the present invention. Figure 2
FIG. 2 is a partial image drawing of an enlarged photograph of a film edge cut by the saw blade shown in FIG. 1. FIG. 3 is a partial schematic diagram showing an enlarged tooth peak of a saw blade used in a conventional (currently commercially available) box, and FIG.
(A) and (B) are partial sketches of enlarged photographs of the film edge cut by the saw blade (conventional product) shown in FIG. 3, respectively, and FIG.
Shows the case where "horizontal opening cut" is performed, and FIG. 4B shows the case where "lifting cut" is performed.

Commonly shown in FIGS. 1 to 4, a solid line (the right end in the figure) drawn in a zigzag shape is a tooth edge of a saw blade or a cut end of a film, and is shown in FIGS. The arrow shown indicates the cutting direction when the film is cut. Fig. 4 [Film cutting edge with conventional saw blade]
In the above, the first thing to note is that the portion shown by the broken line in the vicinity of the zigzag cut edge shows the traces of the tooth flanks of the saw blade that was in contact with the film at the time of cutting, and the hem of the zigzag cut edge and The beard-like part in a part of the valley (T)
Shows the cracks T entering the film, respectively. Note that FIGS. 4A and 4B are also diagrams in which the inventors finally succeeded in photographing as a part of investigating the cause of the defective phenomenon.

In order to facilitate the comparison of the saw blades, the following table 1 shows a list of the tooth flanks of the saw blades and the results (rate of occurrence of the crack portion T). The inclination angle is fixed and the design is adjusted by the pitch.

[0018]

[Table 1]

Supplementally, for example, the comparison of the saw blade shapes of FIG. 1 and FIG. 3 corresponds to the saw blade shapes of the present invention product and the conventional product as shown in Table 1. The height of the crest of the tooth (the distance between the imaginary line at the top of the mountain and the imaginary line at the bottom of the valley) is a comparison with actual dimensions
It can be seen that the height (0.50 mm) of the product of the present invention (FIG. 1) is about 1/2 that of the conventional product (FIG. 3) (1.0 mm). Incidentally, in the example of FIGS. 1 and 3,
Pitch (distance between virtual imaginary lines of the center of the mountain) because the inclination angle of the tooth crests (angle between the ridges of the mountains) is kept constant (60 degrees).
Are adjusted to 1.16 mm and 1.08 mm, respectively, to adjust the height difference of the peaks.

The following is a summary of the results (that is, the background of the invention) of the present inventors considering the cause of the defective phenomenon using FIGS. 4 (A) and 4 (B). That is, a) Traces of tooth flanks of the saw blade that were in contact with the film (broken line portion)
Considering from the fact that the shape of the film and the shape of the actually cut film edge are deviated, the cutting of the film in this case is not always cut along the ridge line of the crest of the tooth crest that abuts. However, there is a rupture phenomenon of the film caused by the tear propagation from the cutting start point made at the tip of the tooth crest. b) The crack portion T generated in a part of the crests and valleys of the zigzag cut end is a portion where the above-mentioned tear propagation rupture is excessively advanced, and this excessive progression is caused by the two adjacent teeth. This is caused by the difference in the time (or direction) of the breaks progressing from the mountain and the opportunity (position) at which both breaks merged. c) The phenomenon that the film is torn in an unintended direction is based on the crack T existing at the cut end of the film picked up at the time of peeling. That is, the force generated between the resistance due to the locking force and the peeling tension concentrates on the crack portion T, and the fracture due to the tear propagation progresses from the crack portion T. Therefore, the traveling direction is broken in the longitudinal, lateral, or diagonal directions (that is, unintended directions) depending on the existence position of the crack portion T, the tip shape of the crack portion T, or along the orientation direction of the film or the crystal structure of the resin. Will be done. d) Therefore, "breaking the film in an unintended direction"
When the force generated between the resistance due to the locking force and the peeling tension is large, it is generated at the crack portion T existing there, but in the case of a film having a large tear strength of the material itself, it is assumed that the film is cracked. Even if the section T exists, the film is unlikely to break.

On the other hand, the present invention differs from the prior art in the following points a) and b). Incidentally, the reasoning of (a) and b) is to deepen the understanding of the explanation. B) The metal saw blade used has a tooth height of 0.80.
mm or less 0.40 mm or more, the valley between adjacent tooth peaks is
The shape has a valley bottom formed in a flat shape in the range of 0.30 mm or more and 0.70 mm or less, and the inclination angle of the tooth crest is 5
It should be in the range of 5 degrees or more and 65 degrees or less and the pitch between the tooth peaks of 1.46 mm or less and 0.72 mm or more. (B) The tip shape of the tooth crest is formed in an arc shape different from the tooth crest located at both ends in the longitudinal direction of the saw blade and the tooth crest located at the center in the longitudinal direction, and the arc shape is the inclination of the tooth crest. When indicated by a circular arc of a circle that can be drawn by contacting both ridge lines of a tooth center on an imaginary line that bisects a corner, tooth teeth located at both ends in the longitudinal direction have a radius of 0.02 mm or more and 0.05 mm or less. The circular arc, the tooth crest located in the central portion in the longitudinal direction is a circular arc having a radius of more than 0.05 mm and 0.08 mm or less, and the thin film body is interposed between the metal saw blade and the box. The length of the existing portion should be within the range of 3% to 8% of the length of the saw blade from the side edge of the saw blade.

The technical significance of the constituents different from the above-mentioned prior art will be described below based on the consideration of a) to d).
First, in [Requirement a), [The height of the tooth flank of the saw blade is 0.80.
It has a valley bottom portion formed to have a flatness and a height of less than mm]. First of all, the technical significance of reducing the height of the tooth edge of the saw blade to 0.80 mm or less is to make the progress of film cutting as close as possible to the cutting along the shape edge of the tooth edge forming the saw blade. is there.
As a result, even when "the film breaks due to the tear propagation from the cutting start point" in the above consideration a), the "deviation of the merging of the breaks" in the consideration b) becomes small, so that the occurrence of the crack T is prevented. The amount can be reduced, and as a result, an effect of suppressing "breakage of the film in an unintended direction" during stripping can be obtained.

Next, the role of the "flat valley bottom" will be described. The first of the roles is that for each tooth crest, the progress of the rupture of the film due to the tear propagation along the shape of the tooth crest from the cutting start point of the tooth tip is restrained at the "flat valley bottom" and the above consideration b). The purpose is to prevent the "opportunity (position) of both breaks joining". And the second role is
Placing the dimension of the flat valley bottom to the specified width increases the concentration of the tension (film pressing) applied to the tip of the tooth crest, reducing the “positional deviation” at the cutting start point of the tooth crest, and as a result It is to promote cutting along the shape of the tooth crest. Both of these two roles lead to the effect of suppressing the generation of the crack portion T. As an ancillary effect, a widening of the tooth pitch is observed.

Comparing the cut ends of the two, FIG.
(A) Compared to the [conventional mountain], Fig. 2 [Lower the mountain,
With a flat valley bottom], both the position and the shape between the trace of the tooth flanks of the saw blade (broken line part) that was in contact with the film and the cut end of the actually cut film are The "deviation is small" has been improved, the occurrence rate of the crack portion T is small by about 90%, and the crack portion T which is slightly generated is also small.

The term "flat valley bottom" as used herein means that, between the tooth peaks of a normal saw blade, the valley bottom of the crest is generally V-shaped. The saw blade of the present invention symbolically represents a flat valley. Therefore, it does not necessarily have to be "flat".
For example, it is sufficient to have "a flatness in which the progress of fracture due to tear propagation from the tooth tip is suppressed", which is apparently a flat valley. On the other hand, on the other hand, the processing of the saw blade is generally performed by so-called shearing force that is sandwiched between a pair of male and female dies, so in order to surely and smoothly engage the pair of dies, for example, The radius of curvature may be rounded at the intersection between the bottom of the tooth crest and the bottom of the valley, and the rising portion may not always be flat. Therefore, in the present invention, the "flat valley bottom portion" is defined as the actual dimension "the (width) dimension of the flat valley bottom portion" and is displayed as a configuration.

Further, according to the research results of the present inventors, it is confirmed that the following points should be noted in the manifestation of the above effects. That is, first, it is necessary to select the height of the tooth crest from the range of 0.60 to 0.40 mm. It is 0.60m
If it is higher than m, the effect of suppressing the occurrence rate of the crack portion T to about 10% or less cannot be expected, and conversely, if the height of the tooth crest is lower than 0.40 mm, the cutting performance to the film is high. This is because there is a problem that the machining accuracy is lowered, and further, it becomes difficult to maintain the processing accuracy. On the other hand, the direction in which the inclination angle of the tooth crest is reduced to less than 55 degrees in order to secure the cutting performance has no effect of suppressing the generation of the crack T. On the contrary, in the direction in which the inclination angle of the tooth crest is increased to more than 65 degrees, the biting of the teeth into the film is deteriorated, the cutting performance tends to be deteriorated, and the refreshing feeling of the cutting sound is also deteriorated. The size of the flat valley bottom is
It is necessary to set it in the range of 0.70 to 0.30 mm. The reason is that when it is larger than 0.70 mm, the “difference in opportunity of merging fractures” mentioned in the above consideration b) is too large, and the crack T tends to occur in the direction of the extension line of the flat valley bottom. Yes, the effect of suppressing the occurrence rate of the crack portion T to about 10% or less cannot be expected, and conversely the size is 0.30.
If it is as small as less than mm, there is a tendency that the effect of restraining the progress of fracture cannot be expected. The pitch of tooth flanks on the object is represented by a relationship in which tooth flanks having a substantially constant pitch are arranged over the entire length of the saw blade as an object.
When the height of the tooth crests is determined, the inclination angle of the tooth crests is determined, and the size of the flat valley bottom is determined, it is naturally determined. Therefore, the definition of the range of the tooth crest pitch 1.46 to 0.72 shown in the present invention is adopted when the height of the tooth crest, the inclination angle of the tooth crest, and the dimension of the flat valley bottom portion are set within the above-described prescribed ranges. It specifically discloses the range of dimensions. However, the numerical specifications of the height of the tooth crest, the inclination angle of the tooth crest, the dimension of the flat valley bottom, and the pitch of the tooth crest specified here are both for suppressing the occurrence of the crack T and maintaining the cutting performance. Since it was selected from the viewpoint of harmonizing the above, the height of the tooth crest, the inclination angle of the tooth crest, the size of the flat valley bottom and Even if the pitch of the tooth crests is non-uniformly arranged, or even if it is arranged differently in the longitudinal part, a sufficient effect can be obtained both in suppressing the occurrence of cracks T and maintaining cutting performance. Of course, it is expected that it will work.

Next, the tip shape of the tooth crest of requirement b) is formed in an arc shape different from the tooth crest located at both longitudinal ends of the saw blade and the tooth crest located at the longitudinal center thereof. , The arc shape is a circle that can be drawn in contact with both ridge lines of the tooth center around a virtual line that bisects the inclination angle of the tooth crest, and the tooth peaks located at both ends in the longitudinal direction are 0.02 mm. 0.05 or more
An arc of a circle with a radius of less than or equal to mm, a tooth crest located at the center in the longitudinal direction is an arc of a circle with a radius of greater than 0.05 mm and less than or equal to 0.08 mm, and the thin film-shaped body is composed of a metal saw blade and a box. The length of the intervening portion should be in the range from 3% to 8% of the length of the saw blade from the side edge of the saw blade. ] The technical significance of

The inventors of the present invention have adopted a saw blade having a shape satisfying the above requirement (a) in the storage box shown in FIG. 5, that is, a thin film over the entire area of the saw blade in the longitudinal direction between the box body and the saw blade. We encountered a problem that the effect of suppressing cracks was not fully exerted when caulking and fixing by interposing a sheet. The cause of this problem is due to the following phenomenon. That is, since the thin film body is cut with a metal mold together with a metal thin plate serving as a saw blade, the thin film body has the same width and the same tooth profile as the saw blade, and should not be an obstacle to film cutting in practical use. However, when viewed microscopically, the tip of the tooth crest of the saw blade is slightly covered with a thin film. This covering cover makes the perforations in the film at the tip of the tooth crests unstable. As a result, the cutting of the film does not proceed along the ridgeline of the crest of the abutting tooth and propagates as a tear, and the cracking occurs because the confluence position of the tear propagation cutting progressing from the tooth crest is displaced. . Further, the fact that the thin film-like body covering the tip of the tooth crests has a great influence on the occurrence of cracks is also a phenomenon caused by making the tooth crests lower than before.

As a result of studying measures against this phenomenon, the present inventors have obtained the following findings. That is, if the circular arc at the tip of the tooth crest is made small, the covering of the thin film body becomes small, which leads to suppression of cracks. However, with such a saw blade, the cutting sound at the time of cutting the film is different from the conventional sound (for example, it cuts without sound). On the other hand, a saw blade with a large arc at the tip of the tooth crest has a large amount of thin film covering and many cracks, and the cutting sound of the film is different from the sound of the conventional product (for example, the cutting sound of burrs). Will be things. In other words, a saw blade in which crack generation is suppressed and an appropriate cutting sound is tuned cannot be obtained in a state where the thin film body is interposed in the entire length between the box surface and the saw blade surface. On the other hand, the thin film-like body interposed between the box surface and the saw blade surface is
It is necessary to easily and reliably remove the saw blade. Moreover, this thin film body needs to have a certain length in order to prevent inconveniences such as tearing and falling off during the peeling of the saw blade.

The requirement (b) is finally found by the research based on the above findings. That is, requirement b)
In short, what is meant by the
The length of the saw blade that can be easily peeled off is kept to the minimum necessary, and the teeth of the saw blade used under that condition are made to satisfy both the suppression of crack generation and the optimization of cutting noise. It means that. Further, generally, the arc arranged at the tip of the tooth crest lowers the height of the tooth crest if its size is large, and reducing the pitch and inclination angle of the tooth crest is similar to making the arc smaller. Make a mistake. However, in the present invention, such adjustment of the circular arc is not intended. Therefore, in the present invention, the basic dimension of the tooth crest is made constant, and only the arc of the tooth crest is adjusted below the tooth crest so as not to be confused with the former. The circular arc is shown by a circular arc that can be drawn in contact with both ridgelines of the tooth center around an imaginary line that bisects the inclination angle of the tooth crest, and the size of the circular arc is shown by the radius of the circle.

The role of the length of the portion of the requirement (b) in which the thin film body is interposed between the saw blade surface and the box surface is to ensure the ease of peeling the saw blade. Further, the length thereof needs to be in the range of 3% to 8% of the length of the saw blade from the side edge of the saw blade. When it is less than 3%, the thin film body may be torn or peeled off in the middle of the film, which causes a trouble in peeling off the saw blade, and the ease of peeling off the saw blade cannot be ensured. On the other hand, when the length is more than 8%, the cutting noise of the same quality as that of the conventional product cannot be expressed by adjusting the radius of the arc of the tip of the tooth crest.

The tip shape of the tooth crest referred to in the above requirement (b) is formed by forming an arc shape different from the tooth crest located at both longitudinal end portions of the saw blade and the tooth crest located at the central portion in the longitudinal direction of the saw blade. It has the role of expressing the cutting sound that continuously occurs from the start to the end of cutting to the cutting sound of the same quality as the conventional product as a whole. The radius of the arc of the tip of the tooth crest (the part where the thin film material is to be interposed) located at both ends in the longitudinal direction of the saw blade is
It must be in the range of 0.02 mm or more and 0.05 mm or less. If the radius of this arc is less than 0.02 mm, the same cutting noise as that of the conventional product cannot be produced by adjusting the radius of the arc of the tip of the tooth crest (the portion where no thin film material is interposed). , 0.05 mm, the effect of suppressing cracks cannot be expected.

The radius of the arc of the tip of the tooth crest (the portion in which the thin film-like body is not interposed) located in the central portion of the saw blade in the longitudinal direction must have a radius of more than 0.05 mm and 0.08 mm or less. . When the radius of this arc is 0.05 mm or less, it is impossible to produce cutting sound of the same quality as the conventional product, and when it exceeds 0.08 mm, the cutting property due to the lowering of the tooth peak due to requirement a) The decrease cannot be compensated.

The position of the length from the side edge of the thin film body interposed between the saw blade surface and the box surface and the above radius are 0.02 m.
The position of the tooth crest represented by an arc of m or more and 0.05 mm or less is the same position, that is, the range from the side edge of the saw blade to 3% or more and 8% or less of the length of the saw blade. desirable.
The reason is that the ease of peeling the saw blade and the effect of suppressing cracks are secured at the highest level. However, there is no practical problem even if the position of the thin film and the position of the tooth crest represented by the arc having a radius of 0.02 mm or more and 0.05 mm or less are deviated by several pitches. This is because the crack suppression effect and the harmony of the cutting sound are slightly affected. The intention of displaying the position where the thin film body is arranged in% is that the saw blade used for the wrap film storage box has, for example, about 15c.
This is because there are various types of m, 22 cm, 30 cm, and 45 cm in length, and the absolute values of the dimensions do not give accurate representations of all of them.

The film to which the present invention is directed is JIS-
It is desirable that the tear strength according to P8116 is 2 g or more and 6 g or less. In other words, "the absolute value of the tear strength is small" is desirable. The "phenomenon in which the film tears in an unintended direction" occurs when the tear strength of the film weakened at the crack portion T is less than the locking force of the temporary fastening portion, as described in consideration d) above. It is a phenomenon. Therefore, a film having an original tear strength of more than 6 g and having a large absolute value does not fall below the locking force, which means that the film is not an object of the present invention. In other words, the smaller the absolute value of the tear strength of the film is, the adverse effect of the strength decrease caused by the presence of the crack is not limited to the problem of the locking force of the temporary fastening part. Even if it receives a slight excess tension, it will lead to "immediate propagation fracture". Thus, packaging films will generally have a tear strength of at least about 2 grams. This means that a film having such a tearable property is the object of the present invention. Specifically, for example, a vinylidene chloride resin having a wall thickness of 6 to 18 μm and a biaxially stretched film or the like has a tear strength (average length and width) of about 2 to 6 g for a normal commercial product and a wall thickness of 9 to Even if carefully selected from the range of 16 μm, it shows a low value in the range of about 3 to 4 g, so that it is an optimum target product in the present invention.

In other words, the present invention does not utilize the cutting of the propagation rupture that occurs in the ratio of the vertical and horizontal tear strengths, but how to cut a film having a small absolute value of the tear strength which easily causes the propagation rupture. It is an invention to solve the problem of whether to follow the tooth crests of. The above description of the advantages of the present invention is made by arranging a metal saw blade having a rectangular columnar shape made of paperboard as shown in FIG. Although the present invention focuses on a storage box which is excellent in performance and is desirable, it is clear that the effect of the invention is manifested based on the shape and design of the teeth of the saw blade. Therefore, for example, the material of the box may be a thin plate of plastic, wood, metal, or the like, and the column shape of the box cross section may be circular, elliptical, or polygonal such as triangular or more. . Furthermore, the overall shape of the saw blade and the attachment position of the saw blade are also shown in FIG.
It is possible to apply not only to the above example but also to all conventionally known ones.

The metal saw blade referred to in the present invention is, for example, iron,
Thickness 0.2 of copper, brass, aluminum, stainless steel, etc.
It is made by cutting a thin plate of about 5 to 0.15 mm.
In this case, the material of the saw blade when carefully selected from rust prevention, maintenance of processing accuracy, cutting tool and robustness, economy, etc. is JIS-G
It is most ideal to use the tin plate defined in 3303. Overall length of saw blade (shape of virtual line connecting blade edges)
Is straight, concave arc, convex arc, V
It may be a projecting shape or a trapezoidal shape.
Further, the metal saw blade of the present invention can be used in a state where the metal saw blade is cut in a saw-tooth shape with a mold, and it is not necessary to dare to sharpen the tooth crest or to sharpen the tooth crest into a conical shape.

The thin film-like material referred to in the present invention can be easily cut into a saw-tooth shape with a metal mold together with a metal thin plate which is a material for a metal saw blade, and the saw-tooth-shaped cuts prevent the wrap film from being cut. There is no particular limitation as long as it has a toughness that can withstand the force of peeling and can be cut into a state in which it does not become rough. Specifically, for example, general processed paper, vulcanized hardened paper, plastic film / sheet, fiber knitting / woven fabric, fiber nonwoven fabric, and the like. Above all, a plastic film or sheet having no orientation in the vertical and horizontal orientations is preferable because it is tough and easy to handle. The thickness will be selected according to the material characteristics adopted for the thin film body and the length of the crimping nail of the saw blade to be targeted, but in general, it is in the range of about 0.05 to 1.5 mm, preferably Is selected from the range of about 0.1 to 0.8 mm.

The temporary fastening portion Q referred to in the present invention is conventionally known both in terms of its material and location. For example, a tacky adhesive or a resin having a smooth surface may be placed in a proper position in front of the cutting tool. For example, the layers are arranged. Among them, the one using the UV-crosslinkable cured varnish as the resin layer having a smooth surface has a high film locking ability as a whole, and thus is advantageous for utilizing the effects of the present invention.

The tear strength referred to in the present invention is JIS P81.
16 is an average value in the vertical and horizontal directions of the values measured according to 16.
A light load tear strength measuring machine (manufactured by Toyo Seiki Seisakusho Co., Ltd.) was used as the measuring machine, and the sample size was cut into pieces of 50 mm in width and 63.5 mm in length, 5 pieces each in length and width. The number. The measurement was performed by making a cut of 12.7 mm at approximately the center in the width direction of the sample. That is, the tear strength targeted by the present invention has a low value, and the error is large in the normally used Elemenddorf measuring machine. However, since there is no other standardized light load measuring method, it is unavoidable that it complies with JIS P8116, which is the standard for paper.

The evaluation method and evaluation scale used in the present invention are as follows. (1) Measurement of shape and angle of saw blade The height, pitch, flat valley bottom, radius of the arc of the tip of the tooth, and the angle of inclination of the tooth are measured with the saw blade. The measurement was made by dividing the tooth into 10 substantially evenly in the longitudinal direction, and enlarging and measuring 10 teeth (100 teeth in total) per divided portion with an optical microscope (magnification about 100 times).
As for the measurement values related to the dimensions, the values measured up to 3 digits after the decimal point were averaged, rounded off to the nearest 3 digits after the decimal point, and rounded to 2 digits after the decimal point. For the angle, the values measured up to one digit after the decimal point were averaged, and the values were rounded off to the first decimal place and rounded off. (2) Occurrence rate of cracks (T) This measurement was carried out in advance by a survey conducted between the result shown by the average value of the values observed for 10 cuttings and the value observed for 1 cutting, It was found that there was only a deviation of about 2% at most, and even if the value observed for one cutting was used, the level of incidence of cracks (T) indicated by the saw blade could be shown. The value observed for the cutting was used. That is, the traces of tooth crests on the entire width of the cut film edge are observed with an optical microscope (magnification about 17 times), the total number of valleys and the number of cracked valleys are counted, and calculated by the following formula. I asked.

Occurrence rate of cracks (%) = (number of valleys with cracks / total number of valleys) × 100 (3) Cutting performance (3) -1 Cutting performance (sharpness) Skilled (highly sensitive) monitor A sensory test was conducted by carefully selecting one person and always making a judgment in comparison with a conventional (commercially available) product. That is, the conventional operation (commercially available) is to pull out a film about 15 cm long from the storage box and cut it.
Repeatedly comparing with the product, and evaluate the sharpness and the alignment of the cut edges. Two types of cutting methods, "lifting cut" and "horizontal opening cut" were adopted and evaluated respectively. The reason why the pull-cut of about 15 cm length is adopted here is that the quality of the saw blade's performance remarkably appears due to relatively difficult cutting.

[0043]

[Table 2]

(3) -2 Persistence of cutting performance The above-mentioned "operation of pulling out a film having a length of about 15 cm and cutting it" is applied to three rolls (20 m rolls) (2
Replenishing from the first), and evaluated by the amount of deformation of the storage box (cover piece) before and after the test. This disconnection
When the load on the storage box is relatively large and the sharpness is reduced, the amount of deformation is large.
As the amount of deformation, the amount of increase in the size of the gap (warp deformation amount) at the longitudinal center between the front plate and the covering lid piece was determined.

For evaluation, "horizontal open cut" was adopted. The reason is that this cutting method is most likely to cause warp deformation of the lid piece.

[0046]

[Table 3]

(3) -3 Cutting sound One skilled (highly sensitive) monitor was carefully selected, and a sensory test was carried out by a monitor that always judges in comparison with a conventional (commercial) product. That is, the conventional operation (commercially available) is to pull out a film about 15 cm long from the storage box and cut it.
The repeated cutting noise is evaluated while comparing with the product. The cutting method is "lifting cut". The reason is that this cutting method is most popular.

[0048]

[Table 4]

(4) Peelability of saw blade The saw blade was peeled off by picking up the protruding portion P of the thin film-like body of the storage box.

[0050]

[Table 5]

[0051]

EXAMPLE A box body containing a vinylidene chloride resin film having a width dimension of about 300 mm wound around a paper tube [trade name: Saran Wrap (manufactured by Asahi Kasei Corp.), tear strength of 3 to 4 g, and winding amount of 20 m] is prepared. At that time, a storage box that is commercially available was prepared. The basic structure of this box is as shown in FIG. That is, a rectangular storage chamber 13 formed by the front plate 1, the bottom plate 2, the rear plate 3, and the side plate 8 and having an open upper portion
A lid plate 4 connected from the side edge of the rear plate 3 of the storage chamber 13 in the direction of covering the storage chamber opening, and a cover lid piece 5 extending from the side edge of the lid plate 4 in the direction of covering the front plate 1. , A rectangular box having a temporary fastening portion Q for locking the cut film on the surface of the front plate 1 covered with the cover piece 5, and the need for the wrapping film F from the winding film R stored in the storage chamber 13. Withdraw the amount,
It is a wrap film storage box used by cutting with a saw blade K made of metal (tin) having a straight shape as a whole arranged at the tip of the cover piece 5. Partial specifications of the front plate 1 of this box are
The overall dimensions are 44 mm in height and 310 mm in length, and when the lid is closed, the portion about 30 mm above the height is the cover piece 5.
Covered with a cutting tool attached to the tip. A temporary fastening portion Q having a width of 16 mm is provided over the entire length from the upper side to the lower side of the front plate leaving 4 mm from the upper edge of the front plate to be covered. This temporary fastening portion Q is coated with a UV-curable curable varnish [trade name: flash dry, manufactured by Toyo Ink Mfg. Co., Ltd.],
A tin plate [rough surface finish, tempering degree DR-8, thickness 0.17 mm (JIS G3303)] was used as the long saw blade K attached to the dried saw blade.

[Experimental Example 1, Comparative Example 1, and Reference Example 1]
The purpose of Experimental Example 1 and Comparative Example 1 is to evaluate the shape of tooth flanks of the saw blade. Therefore, without interposing a thin film,
For saw blades, the radius of the arc at the tip of the tooth crest was unified, and the height of the tooth crest, the inclination angle of the tooth crest, the dimension of the flat valley bottom, and the pitch between the tooth crests were changed. Is evaluated. . The height of the tooth crests, the inclination angle of the tooth crests, and the dimensions of the flat valley bottom of the changed long saw blade are shown in Experiment No. 6 of Table 6. Experiment Nos. 1 to 9 and Table 7 The contents are as shown in 10 to 21. In other words, the values shown in Tables 6 and 7 are the values measured in the text of the saw blade, which was created with the goal of arranging the tooth flakes of the same shape in a uniform distribution over the entire length of the long saw blade (about 305 mm). The numerical values evaluated by the method are shown. Experiment N
o. Experiment Nos. 1 to 9 are Experiment Nos. 1. 10 to 21 are Comparative Example 1.

In order to clarify the difference (contrast) from the conventional (current) technical level, that is, the level (comparative) of the commercial product with a long saw blade designed to meet the customer's request,
Various types of current commercial products were prepared, each saw blade was evaluated by the measuring method described in the text, and the obtained numerical values are shown in Reference Example 1 of Table 7.
One is the commercial product itself of [Product name: Storage box containing Saran Wrap (manufactured by Asahi Kasei)] (Experiment No. 22), and the other is [Product name: Polywrap = Polyethylene resin (made by China Resin Co.). Storage box] (Experiment No. 2
3), and the other is a GLAD WRAP [trade name: manufactured by GLADPRODUCTS (Australia), containing polyethylene resin film] storage box (Experiment No. 24). Experiment No. The reason why 22 was subjected to the experiment is that it is a typical shape of a conventional saw blade. Experiment No. The reason why 23 was used in this experiment was that the material of the long saw blade used was made of paperboard (Valkanized hard modified paperboard: length about 305 mm, thickness 0.28 mm)
It is to be. Therefore, in order to equalize the conditions with the other experimental products, the saw blade was carefully removed, and the saw blade was attached to the back of the cover piece of the same storage box as the other experimental products with a metal needle (Max Needle No. 10-1M) to firmly fix by caulking, and the winding layer film also has a winding width dimension of about 300 mm, a vinylidene chloride resin film [trade name: Saran Wrap (manufactured by Asahi Kasei Corporation), tear strength 3 to 4 g, winding amount 20 m]. I refilled it. Another storage box (Experiment No. 24) is
Equipped with a long metal saw blade (length about 338 mm,
Since the form of (thickness 0.25 mm) is similar in appearance to that of the present invention, it was decided to adopt it here. Therefore, in order to equalize the conditions with other experimental products, carefully raise the caulking claws of the saw blade, remove the saw blade, cut it to 305 mm, and put the saw blade on the cover of the same storage box as other experimental products. The caulking nails are used to firmly fix the caulking to the back side of one piece, and the winding layer film is a vinylidene chloride resin film with a winding width of about 300 mm [Product name: Saran Wrap (Asahi Kasei Co., Ltd.),
The tear strength was 3 to 4 g, and the winding amount was 20 m]. The height of the tooth flank of the saw blade, the inclination angle of the tooth lobe, the dimension of the flat valley bottom, and the pitch between the tooth flanks are shown in Table 7. The contents are shown in 23 to 24.

The above experiment No. 1-21 and Experiment No.
With respect to the storage boxes 22 to 24, the cutting performance and the incidence of cracks were evaluated by the methods described in the text, and the results are summarized in Tables 8 and 9. Experiment No. Enlarged drawing of the saw blade itself and the edge of the film cut with it (1
(A sketch of a 7x photo, with some parts omitted)
They are shown in FIGS. 1 and 2, respectively. Experiment No. Enlarged drawings of the saw blade of No. 22 itself and the edge of the film cut by the saw blade are shown in FIGS. 3 and 4 (A) and (B), respectively. Note that FIG. 4 (A)
Is due to "horizontal opening cut", and FIG. 4 (B) is due to "lifting cut".

The results in Tables 8 and 9 indicate the following. That is, (1) The cutting performance of the saw blade made of paperboard (Experiment No. 23) is
The level of cutting performance targeted by the present invention is far below.
This is due to the quality of the material, and even paperboard that has undergone vulcanized hard modification does not reach the characteristics of metal plates. The rate of occurrence of cracks is also high. This is due to the difference in the shape of the tooth crests.

(2) The cutting performance of the metal saw blade of the reference example (Experiment No. 24) is far below the level of the cutting performance targeted by the present invention. Also, the "incidence rate of cracks" is high. This saw blade has a tear strength of (length / width = 37/1
This is because it is a saw blade specially designed for cutting polyethylene-based resin film that is as large as 44 g) and is extremely stretchable.

(3) In comparison with the "occurrence rate of cracks" in a storage box with a metal saw blade, [for example (Experiment No. 1)]
Suppresses and improves to about 1/13 of the conventional product (Experiment No. 22). Looking at this difference in the tooth flank of the saw blade, the tooth flank height is 1.0 mm for the conventional (currently commercially available) product and 0.5 for the invention product.
This is an effect of reducing the height to 0 mm (about 1/2) and providing a flat valley portion of 0.50 mm. In order to exhibit this suppressing effect, it is necessary to set the height of the tooth crests in the range of 0.40 to 0.60 mm and the flat valley bottom to 0.30 to 0.70 mm. The onset of this surprising effect is unpredictable from the information of the prior art. [Example 1 and Comparative Example 2] The purpose of Example 1 and Comparative Example 2 is to
This is to show the length of the thin film-like material that is necessary to ensure the ease of peeling off the saw blade. The saw blade shown in Note 1 was standardized, and only the intervening form of the thin film was changed, and the peelability of the saw blade was evaluated by 500 samples by the method described in the text. Table 10 shows the intervening length of the modified thin film-like material and the result thereof. Experiment No. 25
No. 27 to No. 27 are in Example 1, and Experiment No. 28 to 29 are Comparative Example 2
Is. The results in Table 10 show the following. That is, (4) The minimum length of the thin film-like material to ensure the ease of peeling off the saw blade is 3% of the total length of the saw blade.
It turns out that

[Example 2 and Comparative Example 3] The purpose of Example 2 and Comparative Example 3 is to suppress cutting noise and cracks of a saw blade to be employed, provided that a thin film-like material is interposed in addition to the above. It is to show the radius of the arc of the tip of the tooth for harmony. Therefore, Experiment No. 31 to 38 are the height of the tooth peak, the inclination angle of the tooth peak,
The size of the flat valley bottom and the pitch between the crests of the teeth were determined by experiment No. In the same manner as in No. 1, the radius of the circular arc at the tip of the tooth crest and the length in which the thin film is interposed are changed. 30 demonstrates the utility of different sized saw blades within the present invention. Experiment No. For 30 to 38, the cutting performance and crack occurrence rate were evaluated by the methods described in the text. Table 11 shows the changed dimensions and the results. . Experiment No. 30 to 34 are the second embodiment, and the experiment No. 35 to 38 are Comparative Example 3. Table 11
The results show that: That is, (5) it is understood that the upper limit of the length in which the thin film-like material is interposed is 8% of the total length of the saw blade. The radius of the circular arc at the tip of the tooth crest that can harmonize cutting noise and crack suppression is 0.02 mm or more and 0.05 mm or less for the tooth crests located at both ends, and 0.05 mm for the tooth crest located at the center. It can be seen that the range is over 0.08 mm or less.

[0059]

[Table 6]

[0060]

[Table 7]

[0061]

[Table 8]

[0062]

[Table 9]

[0063]

[Table 10]

[0064]

[Table 11]

[0065]

As is clear from the results of Tables 6 to 11, in the storage box of the present invention having the above-mentioned structure, the saw blade can be safely and easily peeled off, and the storage box of the conventional (currently commercially available) product can be removed. While maintaining the cutting performance (cuttability, sustainability of cutting performance, and cutting sound) that it has, it has the effect of significantly suppressing the incidence of cracks occurring at the ends of the cut film. This crack is the cause of the phenomenon that the film "rips in an unintended direction" when the film edge is pulled out, so a storage box that greatly suppresses the rate of cracks is an excellent invention that is beneficial to industry. is there.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of the present invention, which is an enlarged (partially omitted) drawing of a metal saw blade according to the present invention.

FIG. 2 is an enlarged (partially omitted) sketch drawing of a film edge cut by the saw blade of FIG. 1 according to an embodiment of the present invention.

FIG. 3 An enlarged (partially omitted) drawing of the saw blade of a conventional (currently commercially available) storage box

4 is an enlarged (partially omitted) drawing of a film edge cut by the saw blade of FIG.

FIG. 5 is a schematic diagram showing the structure of a conventional storage box.

[Explanation of symbols]

 1 Front plate 2 Bottom plate 3 Rear plate 4 Lid plate 5 Cover lid piece 6 Opening piece 7 Auxiliary side plate 8 Side plate 9 Local joint 10 Cut line 11 Side caulking lid piece 12 Caulking tool 13 Storage room P Thin film Q protruding part Fastening part (Film locking part) K Cutting tool (long metal saw blade) R Winding film F Film

Claims (3)

[Claims] 1. A column-shaped box, a winding film stored in a box storage chamber, and a long metal saw blade arranged in the box,
The metal saw blade interposes a thin film body having the same width as that of the saw blade between the saw blade surface and the box surface with the end of the thin film body protruding from the saw blade end, and the caulking claw is provided. In the wrapping film storage box fixed to the box, the metal saw blade satisfies the following conditions a to e, and is interposed between the saw blade surface and the box body surface. A wrapping film storage box, wherein the thin film-like material is arranged only from a side edge of the saw blade to a length portion within a range of 3% to 8% of a length of the saw blade. [Conditions for metal saw blade] a. Height of tooth crest: range of 0.60 mm or less and 0.40 mm or more b. Inclination angle of tooth crest: range of 55 degrees or more and 65 degrees or less c. Pitch between teeth: range of 1.46 mm or less and 0.72 mm or more d. Shape of valley portion between adjacent tooth peaks: forming a flat shape having a length in the range of 0.30 mm or more and 0.70 mm or less e. Tip shape of tooth crest: The tooth crest located at both longitudinal end portions of the saw blade and the tooth crest located at the central portion in the longitudinal direction are formed in different arc shapes, and the arc shape defines the inclination angle of the tooth crests. When it is shown by a circular arc of a circle that can be drawn in contact with both ridgelines of the tooth peak centering on an imaginary line that divides equally, the tooth peaks located at both ends in the longitudinal direction are circular arcs with a radius of 0.02 mm to 0.05 mm,
The tooth crest located at the central portion in the longitudinal direction is an arc of a circle having a radius of more than 0.05 mm and 0.08 mm or less. 2. The position of the length from the side edge of the thin film body interposed between the saw blade surface and the box body surface and the radius of 0.
The wrapping film storage box according to claim 1, wherein the position is the same as the position of the tooth crest indicated by an arc of 02 mm or more and 0.05 mm or less. 3. The wrap film is JIS-P81.
The wrapping film storage box according to claim 1, which has a tear strength according to 16 of 2 g or more and 6 g or less.