TWI488776B - Cling film storage box - Google Patents

Description

Cling film storage box

The present invention relates to a wrap film storage case which is mainly used for direct packaging of foods in general households, food sales, and the like, and particularly relates to a saw blade used for a wrap film storage case.

Conventionally, it has been known that a wrap film storage case in which a wrap film is wound in a storage chamber of a column-shaped main body portion as shown in FIG. In the case of the columnar shape, for example, various shapes such as a columnar shape and a triangular to octagonal polygonal column shape are known. Further, at the time of use, the wrap film is pulled out from the wound wrap film in the main body portion of the cartridge, and is cut by a saw blade attached to the back surface of the front wall of the lid body of the cartridge body portion, for example.

For a saw blade that is mounted on a commercially available storage box, it is generally made of metal. The shape design of the prior metal saw blade is strictly selected based on the three aspects of the safety and the cutting performance of the finger and the durability of the cutting performance, and the processing precision thereof is performed. Careful attention to the process management, so based on these points of view, the consumer is valued and received a "excellent" evaluation.

Moreover, according to recent concerns about environmental issues, non-metallic saw blades made of paper or resin have been studied. As for the overall shape of the saw blade (the shape of the line connecting the tooth tips by imaginary), a straight person, a concave arc, a convex arc, a V-shaped shape, a trapezoidal shape, etc. are known. .

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 3562867

[Patent Document 2] Japanese Patent No. 4996419

However, in the storage case as described above, "the cling film is cracked in the longitudinal direction, the lateral direction, and the oblique direction (unintended direction)". Such a defect is caused, for example, in a cling film having a wall thickness of 8 to 15 μm of a vinylidene chloride-based resin. Since the occurrence of such a problem is such that the plastic wrap is easily pulled out, when the storage case is formed with a temporary fixing portion for temporarily fixing the end portion of the wrap film, the end portion of the wrap film is from the temporary fixing portion. When the wrap film is removed and pulled out, the wrap film is cracked in the longitudinal direction, the lateral direction, and the oblique direction (unwanted direction) according to the trace of the tooth peak attached to the edge of the wrap film.

The reason why this problem is remarkable is that the end portion of the wrap film which is completely prevented from being pulled out is retracted in the storage case, and the fastening strength of the temporary fixing portion is improved, and it is difficult to remove the buckle to temporarily fix. Preservative film. However, if it is assumed that the retaining strength of the temporary fixing portion is lowered and the wrap film is easily peeled off, the phenomenon of rewinding the end portion of the wrap film is increased, and the end portion of the wrap film is adhered to the wrap wrap film, so the wrap film The problem of cracking in an undesired direction is caused by the surface of the wound wrap film, and only the generated portion moves, which is unlikely to be a countermeasure against this problem.

The present invention has been made in view of the above points, and an object thereof is to provide a wrap film storage case in which the saw blade has a high cutting performance and can suppress the wrap film from the cut end portion thereof to the longitudinal direction, the lateral direction, and the oblique direction (unexpected Direction) split open.

That is, the present invention is as follows.

(1) A wrap film storage case comprising a case main body portion for accommodating a tubular wrap wrap film, and a wrap film which is provided along the longitudinal direction of the case main body portion and which is cut out from the cartridge main body portion. a saw blade; the saw blade has a plurality of rows arranged in a longitudinal direction of the main body portion of the casing a tooth peak and a flat portion connecting adjacent tooth peaks; each of the tooth peaks is inclined from a tooth tip toward a tooth root on a center side and an end side of the cartridge body portion, and the tilt is connected to the flat portion in an arc shape. The curvature radius R1 of the arc of the center side of the cartridge body portion and the flat portion of the tooth peak satisfies 0.36 × ((H1 + H2) / 2) < R1 < 0.55 × ((H1 + H2) / 2) The condition that the inclination of the end side of the box main body portion of the tooth peak and the curvature radius R2 of the circular arc between the flat portions satisfy 0.36 × ((H1 + H2) / 2) < R2 < 0.55 × (( The condition of H1+H2)/2) (H1, H2 is the height of the tooth peak relative to the flat surface, and when there are two kinds of heights of the tooth peak, the higher height is set to H1, whichever is lower. The height is set to H2, and when the height of the tooth peak is one, the height is set to H1 and H2).

(2) The wrap film storage case according to the first aspect of the invention, wherein the flat portion of the saw blade has a length of 0.15 mm or more and 0.30 mm or less.

(3) The wrap film storage case according to the aspect (1) or (2), wherein the heights H1 and H2 of the tooth peaks of the saw blade are 0.40 mm or more and 0.60 mm or less.

(4) The wrap film storage case according to any one of the aspects of the present invention, wherein the tooth peak has an expansion angle of 55 degrees or more and 65 degrees or less.

(5) The wrap film storage case according to any one of the aspects of the present invention, wherein the radius of curvature of the tooth tip is 0.02 mm or more and 0.08 mm or less.

(6) The wrap film storage case according to any one of the items (1) to (5), wherein the thickness of the saw blade is 0.15 mm or more and 0.30 mm or less, and a burr is erected at a blade edge on the side in contact with the wrap film. .

According to the present invention, the radius of curvature R1 of the arc between the inclination of the center side of the box of the tooth peak and the flat portion and the arc of the flat portion are set by satisfying specific conditions. The radius of curvature R2, when the tip of the tooth bites into the wrap film to break the wrap film, and then the fracture of the wrap film is connected to each other by the adjacent tooth tips, the fractures do not deviate from each other, and the flat portion corresponding to the saw blade can be suppressed. Scratches or turtles appear on the cling film crack. As a result, it is possible to suppress cracking of the wrap film from the cut end portion in the longitudinal direction, the lateral direction, and the oblique direction (unwanted direction). Further, it is possible to prevent the cutting performance of the saw blade from being lowered.

1‧‧‧ front board

2‧‧‧floor

3‧‧‧ Back panel

4‧‧‧ side panels

5‧‧‧ Cover

6‧‧‧ Covering piece

7‧‧‧ side panels

8‧‧‧ glitch

10‧‧‧Box body

20‧‧‧ tooth peak

21‧‧‧ Flat Department

22‧‧‧Sloping part

A‧‧‧ plastic wrap storage box

CL‧‧‧ center line

EL‧‧‧End line

F‧‧‧Cling film

H‧‧‧ Height

H1‧‧‧ height of the tooth peak

H2‧‧‧ height of the tooth peak

K‧‧‧ saw blade

L1‧‧‧ distance between the tips

Length of L2‧‧‧ flat section

M‧‧‧ Storage Department

N‧‧‧ cover

Q‧‧‧ Temporary Fixing Department

R‧‧‧wound wrap film

R1, R2‧‧‧ radius of curvature

Θ‧‧‧ Extension angle of the tooth peak

Fig. 1 is a perspective view showing a state in which the wrap film storage case of the present invention is assembled, the cover is opened, and the film is pulled out.

Figure 2 is an overall view of the saw blade.

Fig. 3 is an explanatory view showing a state in which a cover sheet is superposed on a front plate.

Figure 4 is an enlarged view of the central portion of the saw blade.

Fig. 5 is an enlarged view showing a central portion of the saw blade whose side of the tooth peak faces the center line side.

Fig. 6 is an enlarged view of a central portion of the saw blade with the tooth peak facing the end line side.

Fig. 7 is an enlarged view of a central portion of a saw blade in which tooth peaks having different sizes are alternately arranged.

Fig. 8 is a table showing various dimensions of the saw blade of the embodiment and the comparative example.

Fig. 9 is a table showing the evaluation results of the examples and comparative examples.

Hereinafter, embodiments of the present invention will be described. The following embodiments are illustrative of the invention, and the invention is not limited to the embodiments.

The wrap film storage case A shown in Fig. 1 is an example of a commercially available general-purpose quadrangular prism. In FIG. 1, the wrap film storage case A has a rectangular parallelepiped storage portion M which is formed by the front plate 1, the bottom plate 2, the rear plate 3, and the side plate 4, and is open at the upper portion; the cover portion N is self-contained. a side cover 3 of the rear panel 3 is formed in a direction in which the cover 5 is connected to the opening of the storage portion, a cover sheet 6 extending from the side edge of the cover 5 toward the front panel 1 and a side panel 7; The cartridge body portion 10 of the wound wrap film R is cylindrically wound. The cartridge main body 10 is provided with a saw blade K that cuts the wrap film F drawn from the wound wrap film R accommodated in the accommodating portion M. The saw blade K is, for example, a long rectangular shape, and is disposed at the front end of the cover sheet 6 along the longitudinal direction of the cartridge body portion 10. In the front plate 1, a temporary fixing portion Q for temporarily fixing the end portion of the wrap film F is provided. Next, when the wrap film F is used, the wound wrap film R is taken from the case body portion 10 The necessary amount of the wrap film F is removed, and the wrap film K of the cover sheet 6 is cut to cut the wrap film F. When the end portion of the wrap film F is temporarily fixed to the temporary fixing portion Q, the end portion of the wrap film F that has caught the temporary fixing portion Q is pulled out from the wound wrap film R and cut by the saw blade K.

Figure 2 is an overall view of the saw blade K. The saw blade K is attached to the left and right symmetry centering on the center line CL of the cartridge body portion 10, and is continuously formed between the both ends (end lines) EL in the longitudinal direction of the cartridge body portion 10.

The saw blade K has a plurality of peaks 20 arranged in the longitudinal direction of the cartridge body portion 10 as shown in FIGS. 4 to 7 and a flat portion 21 connecting the adjacent peaks 20 to each other. Each of the tooth peaks 20 is inclined from the tooth tip toward the root of the tooth to the center line CL side of the cartridge body portion 10 and the end line EL side, and the inclined portion 22 is connected to the flat portion 21 in an arc shape.

4 is an example of a saw blade K in which the shape of the tooth peak 20 is bilaterally symmetrical, and FIG. 5 shows that the shape of the tooth peak 20 is inclined on the side of the center line CL (the tooth tip of the tooth peak 20 faces the center line CL side). In one example of K, FIG. 6 shows an example in which the shape of the tooth peak 20 is inclined to the end line EL side of the long side direction (the tooth tip of the tooth peak 20 faces the end line EL side). Fig. 7 shows an example of a saw blade K having two kinds of tooth peaks 20 having different heights.

The radius of curvature R1 of the circular arc between the inclined portion 22 on the center line CL side of the tooth peak 20 and the flat portion 21 satisfies 0.36 × ((H1 + H2) / 2) < R1 < 0.55 × ((H1 + H2) / 2 The condition, the radius of curvature R2 of the circular arc between the inclined portion on the EL line side of the tooth peak 20 and the flat portion 21 satisfies 0.36 × ((H1 + H2) / 2) < R2 < 0.55 × ((H1 + H2) ) /) conditions. Further, when the heights of the H1 and H2 series tooth peaks 20 are relative to the flat surface 21, when the height of the tooth peaks is two, the height of the higher one is set to H1, and the height of the lower one is set to H2. When the height of the peak is one, the height is set to H1 and H2. When the heights of H1 and H2 are different, when the cling film F bites into the saw blade K, the timing of biting is different, and when the fracture of the wrap film F of the flat portion 21 is connected to each other, the fractures are deviated from each other, and therefore, it is preferable. H1 and H2 are the same height.

In this manner, by setting the radius of curvature R1 and the radius of curvature R2 to meet specific conditions, the tip of the tooth bites into the wrap film F to break the wrap film F, and then by contiguous When the tooth tips connect the fractures of the wrap film F to each other, the fractures do not deviate from each other, and scratching or cracking on the wrap film F corresponding to the flat portion 21 of the saw blade can be suppressed. As a result, cracking of the wrap film F from the cut end portion in the longitudinal direction, the lateral direction, and the oblique direction (unwanted direction) can be suppressed. Further, it is also possible to prevent the cutting performance of the saw blade K from being lowered.

On the other hand, if the radius of curvature R1 and the radius of curvature R2 are less than 0.36 × ((H1 + H2) / 2) or exceed 0.55 × ((H1 + H2) / 2), the fracture of the wrap film F is caused by the tips of the teeth. On the other hand, when they are connected to each other, the crack of the wrap film F occurs in the flat portion 21, so that the wrap film F after the cutting is split from the cut end portion in the longitudinal direction, the lateral direction, and the oblique direction (unwanted direction). The radius of curvature R1 and the radius of curvature R2 are preferably the same radius of curvature.

Further, the length L2 of the flat portion 21 between the tooth peaks 20 is preferably in the range of 0.15 mm or more and 0.30 mm or less. More preferably, the length L2 of the flat portion 21 is in the range of 0.15 mm or more and 0.25 mm or less. When the length L2 of the flat portion 21 is within this range, the phenomenon that the wrap film F is cracked in an undesired direction is less likely to occur. Further, the flat portion indicates a portion in which the height difference in the flat portion 21 is 0.05 mm or less.

Further, in the case where the saw blade K is a metal, it is made of a thin metal plate such as a tin plate. In the case of using a metal plate, the thickness of the saw blade K is desirably in the range of 0.15 mm or more and 0.30 mm or less. In this case, as shown in FIG. 3, a burr may be erected on the blade edge of the saw blade K on the side in contact with the wrap film F. When the burr 8 is erected, the burr 8 easily bites into the wrap film F when the wrap film F is cut, and the cutting performance is improved. If the thickness of the saw blade K is less than 0.15 mm, the rigidity for cutting the wrap film F cannot be ensured, and if it exceeds 0.30 mm, it is difficult for the tooth tip to bite into the wrap film F when the wrap film F is cut. The performance of the break is degraded.

The material of the wrap film F may, for example, be polyvinylidene chloride, polyvinyl chloride, polyethylene, polymethylpentene, polyethylene/nylon/polyethylene or the like. Polyvinylidene chloride is preferred in terms of better cutting properties.

The material of the saw blade K may, for example, be polyester, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether-ether-ketone resin), or PES (polyether resin). , PPS (polyphenylene sulfide) and the like.

[Examples]

Hereinafter, embodiments of the invention will be described.

[Example 1]

In the first embodiment, a saw blade K having a tooth peak 20 of a substantially equilateral triangle is provided in the lateral width of the cartridge body portion 10 as shown in FIG. The radius of curvature R1 and R2 between the inclined portion 22 of the tooth peak 20 and the flat portion 21 of the saw blade K is 0.25 mm, and the length L2 of the flat portion 21 between the tooth peaks 20 is 0.21 mm. Using the wrap film storage case provided with the saw blade K, the cutting performance, the end face strength (the strength of the split end of the cut film), and the longitudinal cracking failure during the recovery operation are evaluated based on the evaluation criteria described later. The ease of longitudinal splitting).

[Examples 2 to 7]

In the second to sixth embodiments, a saw blade having a tooth peak 20 of a substantially equilateral triangle is provided in the lateral width of the cartridge body 10 as shown in FIG. K. The radius of curvature R1 and R2 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 of the saw blade K is in the range of 0.20 mm or more and 0.30 mm or less. Further, the length L2 of the flat portion 21 between the tooth peaks 20 is 0.15 mm or more and 0.26 mm or less.

In the seventh embodiment, the tooth peaks 20 of the substantially equilateral triangles having different sizes are alternately arranged in the lateral width of the cartridge body 10 as shown in FIG. Saw blade K. The radius of curvature R1 and R2 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 of the saw blade K is in the range of 0.20 mm or more and 0.30 mm or less. Further, the length L2 of the flat portion 21 between the tooth peaks 20 is 0.15 mm or more and 0.26 mm or less.

[Comparative Examples 1 to 13]

The saw blade K of the comparative examples 1 to 13 is the same as the above-described embodiment, and is bilaterally symmetrical about the center line CL, and a substantially equilateral triangle is provided over the entire lateral width of the cartridge body portion 10. The tooth peak of the shape 20. In Comparative Examples 1 to 5, the curvature radiuses R1 and R2 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 are in the range of 0.15 mm or more and 0.35 mm or less, and the flat portion between the tooth peaks 20 is further The length L2 of 21 is 0.00 mm or more and 0.41 mm or less, and the radius of curvature R1 is equal to the radius of curvature R2. In Comparative Examples 6 to 9, the curvature radiuses R1 and R2 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 are in the range of 0.15 mm or more and 0.60 mm or less, and the radius of curvature R1 of the center line CL side is The radius of curvature R2 of the side of the end line EL is smaller. Further, the length L2 of the flat portion 21 between the tooth peaks 20 is 0.02 mm or more and 0.24 mm or less. In Comparative Examples 10 to 13, the curvature radiuses R1 and R2 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 are in the range of 0.15 mm or more and 0.60 mm or less, and the radius of curvature R1 of the center line CL side is The radius of curvature R2 of the side of the end line EL is larger. Further, the length L2 of the flat portion 21 between the tooth peaks 20 is 0.02 mm or more and 0.24 mm or less.

[Comparative Example 14]

In the comparative example 14, the saw blade K shown in FIG. 5 was used, and the saw blade K was bilaterally symmetrical about the center line CL, and the tooth edge of the saw blade K was oriented toward the center line CL side. In Comparative Example 14, the radius of curvature R1 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 is 0.45 mm and R2 is 0.25 mm, and the length L2 of the flat portion 21 between the peaks 20 is 0.17mm. Further, the spread angle θ of the tooth peak 20 is 49.2 degrees.

[Comparative Examples 15, 16]

In the comparative example, a saw blade K as shown in FIG. 6 is used, and the saw blade K is bilaterally symmetrical about the center line CL, and the tooth edge of the saw blade K faces the end line EL side. In Comparative Example 15, the radius of curvature R1 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 was 0.25 mm and R2 was 0.45 mm, and the length L2 of the flat portion 21 between the peaks 20 was 0.17. Mm. In Comparative Example 16, the radius of curvature R1 of the circular arc on the center line CL side between the inclined portion 22 of the tooth peak 20 and the flat portion 21 is 0.25 mm, and the radius of curvature R2 of the circular arc on the end line EL side is 0.60 mm. Further, the length L2 of the flat portion 21 between the tooth peaks 20 is 0.09 mm. Further, in either case, the spread angle θ of the tooth tip of the tooth peak 20 is 49.2 degrees.

[Comparative Examples 17 to 20]

In the comparative examples 17 to 20, a saw blade K as shown in Fig. 7 was used, and the saw blade K was bilaterally symmetrical with respect to the center line CL, and alternately provided with a high peak 20 and height having a height H1. It is the 2 kinds of teeth of the lower tooth peak 20 of H2. Further, in Comparative Examples 17 to 20, the curvature radiuses R1 and R2 of the circular arc between the inclined portion 22 of the tooth peak 20 and the flat portion 21 are in the range of 0.15 mm or more to 0.35 mm or less, and the tooth peak 20 is further The length L2 of the flat portion 21 is between 0.00 mm and 0.32 mm.

In the above embodiments and comparative examples, the height of the tooth peak 20, the expansion angle of the tooth tip of the tooth peak 20, the curvature radius R1, R2, and the tooth of the arc of the inclined portion 22 of the flat portion 21 and the tooth peak 20 are prepared. A saw blade K made of metal having a different length of the flat portion 21 between the peaks 20. The configurations of the saw blades K of the above-described embodiments and comparative examples are as shown in Figs. 4 to 7, and are shown in Table 1 of Fig. 8. The saw blade K of the above-mentioned examples and comparative examples is a plastic wrap storage case (approximately 31 cm in length, 4.5 cm in width, and height) used by "Saran Wrap" (registered trademark) manufactured and sold by Asahi Kasei Household Products Co., Ltd. 4.5cm paper box). Next, the wrap film of the polyvinylidene chloride contained in the wrap film storage case is actually cut.

[Evaluation Benchmarks and Results]

The evaluation methods and evaluation scales used in the examples of the present invention are shown below, and each evaluation result and the eligibility (○: pass, ×: fail) are shown in Fig. 9.

(1) Cutting performance

The cutting energy is measured five times in a "normal swing cutting" and "similar swing cutting" one by one, and the "normal swing cutting" is to pull out the plastic wrap F from the wrap film storage box A at a speed of 1 m/min, and the storage box A is placed. The angle between the saw blade K) of the cover sheet 6 and the end portion of the wrap film F is set to 50 degrees, and the wrap film F is cut from one end of the saw blade K toward the other end in sequence, which is similar to the swing cut. The parallel relationship between the storage box A and the wrap film F is maintained, and the wrap film F is sequentially cut from one end of the saw blade K toward the other end. From the viewpoint of easiness of cutting, it is considered that the cutting energy is 25 mJ or less, and the cutting performance is good, and it is made acceptable. Will receive each The measured value of the cutting energy of the nano-box A is shown in Fig. 9 (rounded by the second decimal place).

Each of Examples 1 to 7 and Comparative Examples 1 to 3 and 5 to 15 were qualified, and Comparative Examples 4 and 16 to 20 were considered to have poor cutting performance because of high cutting energy. Further, according to Comparative Examples 17 to 20, the cutting energy was high, and it was found that the cutting performance was deteriorated when two types of teeth having different sizes were alternately provided.

(2) End face strength (strength of cracking of the end of the cut film)

Cracking strength when the measurement is performed for 20 times or less: The plastic wrap F of about 30 cm length is pulled out from the wrap film storage case A, and after cutting it, the grip of the center portion of the cut plastic wrap F is grasped. At 5 mm, the sheet was split at a speed of 20 deg/sec. From the viewpoint that longitudinal cracking is unlikely to occur, the end face strength is set to 15 N or more. The measured values of the end face strength of each storage case A are shown in Table 2 (the second decimal place is rounded off).

Each of Examples 1 to 7 and Comparative Examples 4, 5, 7, 8, 12, 14, and 15 were qualified, and Comparative Examples 1 to 3, 6, 9 to 11, 13, and 16 to 20 were regarded as having low end strengths, and The end portion of the cut plastic wrap F is easily broken in the longitudinal direction and is unqualified. In particular, when the length of the flat portion 21 between the tooth peaks 20 is as short as 0.10 mm or less, the plastic wrap is cut by the tip of the tooth, and the wrap of each wrap film F is deviated when it is connected. The portion 21 is prone to cracking of the wrap film F, and the end face strength is low.

(3) Poor longitudinal cracking during recovery operations (ease of longitudinal splitting after failure)

It is assumed that after the plastic wrap F is cut, the "wrap-up wrap film is adhered to the wrap wrap film", and the wrap film F of about 30 cm length is pulled out from the storage case A 20 times, and cut, The cut end of the wrap film was adhered to the wound wrap film R, and the repair operation of peeling the wrap film F from the end portion of the cellophane tape was evaluated, and the number of occurrences of the longitudinal splitting was evaluated, and the incidence of the longitudinal splitting was calculated. From the viewpoint of the difficulty of occurrence of longitudinal splitting, the incidence of longitudinal splitting is 30% or less. The longitudinal splitting rate of each storage case A is shown in Fig. 9.

Each of the first to seventh embodiments and the comparative example 7 was qualified, and the comparative examples 1 to 6 and 8 to 20 were regarded as having a high incidence of longitudinal splitting, and after the plastic wrap F was cut, the wrap film F was adhered to the film. Winding protection When the fresh film R is in a bad condition, it is prone to longitudinal cracking and is unqualified. In particular, as in the case of Comparative Examples 9, 13, and 16, the radius of curvature of the arc of the flat portion 21 and the inclined portion 22 is 0.60 mm, which is large, and longitudinal splitting is likely to occur.

According to the above results, the wrap film storage container A of the present invention has the strength of cracking the end portion of the cut plastic wrap F to the previous state while maintaining the cutting performance of the previously (marketed) product. Sale) 1.5 times the effect of the product. In addition, when the cut end of the wrap film F is adhered to the wrap film W, and the cellophane strip is peeled off from the end portion, the wrap film is placed in the vertical direction, the horizontal direction, The rate of longitudinal splitting in the direction of the oblique direction (unwanted direction) is reduced to less than 1/2 of the previous (marketed) product.

20‧‧‧ tooth peak

21‧‧‧ Flat Department

22‧‧‧Sloping part

CL‧‧‧ center line

H‧‧‧ Height

K‧‧‧ saw blade

L1‧‧‧ distance between the tips

Length of L2‧‧‧ flat section

R1‧‧‧ radius of curvature

R2‧‧‧ radius of curvature

Θ‧‧‧ Extension angle of the tooth peak

Claims (6)

A wrap film storage case comprising a cartridge main body portion for accommodating a tubular wrap wrap film, and a saw blade that is disposed along the longitudinal direction of the cartridge main body portion and cuts the wrap film that is pulled out from the cartridge main body portion The saw blade includes a plurality of tooth peaks arranged in a longitudinal direction of the casing main body portion and a flat portion connecting adjacent tooth peaks, wherein the respective tooth peaks are inclined from the tooth tip toward the tooth root to the casing body portion. The center side and the end side are connected to the flat portion in an arc shape, and the curvature radius R1 of the arc between the inclination of the center side of the box main body portion and the flat portion of the tooth peak satisfies 0.36 × ((H1) +H2)/2)<R1<0.55×((H1+H2)/2), the inclination of the end side of the above-mentioned box main body portion of the above-mentioned tooth peak and the curvature radius R2 of the circular arc between the flat portions satisfy 0.36 ((H1+H2)/2)<R2<0.55×((H1+H2)/2) (H1, H2, the height of the tooth peak relative to the flat surface, when the height of the tooth peak is two The height of the higher one is set to H1, the height of the lower one is set to H2, and when the height of the tooth peak is one, the height is set to H1, H2). The wrap film storage case of claim 1, wherein the flat portion of the saw blade has a length of 0.15 mm or more and 0.30 mm or less. The wrap film storage case according to claim 1 or 2, wherein the heights H1 and H2 of the tooth peaks of the saw blade are 0.40 mm or more and 0.60 mm or less. The wrap film storage case according to any one of claims 1 to 3, wherein the crown angle of the tooth peak is 55 degrees or more and 65 degrees or less. The wrap film storage case according to any one of claims 1 to 4, wherein a radius of curvature of the tooth tip is 0.02 mm or more and 0.08 mm or less. The wrap film storage box according to any one of claims 1 to 5, wherein the thickness of the saw blade It is 0.15 mm or more and 0.30 mm or less, and the burr is erected on the blade edge on the side in contact with the wrap film.