JPH0738129Y2 - Wrap film storage box - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention relates to a wrapping film storage box, particularly a food packaging, etc. having excellent operability and safety in cutting.
The present invention relates to a wrap film storage box used for .

[0002]

2. Description of the Related Art Conventionally, polyvinyl chloride, polyvinyl chloride
From synthetic resins such as den, polyethylene and polybutadiene
The wrapping film is sold in a storage box , which is obtained by winding a cardboard-made cylindrical winding roll for several meters to several tens of meters. This storage box is provided with a saw-tooth cutting blade at its longitudinal ridge, so that the stored wrap film can be pulled out, and if necessary, cut into a certain length for use. Such a conventional saw-tooth cutting blade is one in which the teeth at the end of the tooth row of the saw-tooth film cutting tool are formed more sharply than the other teeth to improve the cutting performance (Actually No. Sho 55- 17
No. 3445) or the amount of protrusion of the cutter from the ridge of the storage box is large at both ends of the cutter in the longitudinal direction and small at the center, and the pitch of the cutter blade is small at both ends of the cutter in the longitudinal direction and large at the center. and the cut resistance of the wrap film in constant, which has improved sharpness (Japanese Utility Model 61-228 2 4 No.) is known.

[0003]

However, in the above-mentioned conventional saw-like cutting blade, in order to improve the cuttability (cutness) when cutting the wrap film, both ends in the longitudinal direction are made sharper than the central part. Or, by making the protruding length of both ends longer than the center part, there was a problem that the user could easily injure his / her hand or fingers when pulling out or cutting the film, and thus the operation had to be performed carefully. .
In particular, wrap films are frequently used for household use, and in such products, it is important to maintain sufficient safety first, and this is strongly required. Therefore, in view of the above problems, the present invention aims to provide a wrap film storage box capable of improving the cuttability of a film and maintaining sufficient safety.

[0004]

Means for Solving the Problems The present inventor has conducted various studies in order to solve the above-mentioned problems, and as a result, the cutting edge of the saw-tooth cutting blade has a desired radius or an elliptic arc close to this, and excellent cutting properties by forming the both ends in the longitudinal direction sharper than a central portion, which was found that the operational safety is assured. That is, the present invention relates to a wrap film storage box in which a wrap film stored in a case is pulled out by a required length and is cut by a saw-shaped film cutting blade attached to one ridge of the case. The arc of the tip end of the is a circular arc having an arc of 0.05 mm or more and 0.15 mm or less at its both ends in the longitudinal direction or its approximate elliptic arc, and is larger than 0.15 mm and 0.3 mm or less in the central part of the longitudinal direction. The gist of the present invention is to provide a wrap film storage box characterized in that it is formed into an arc having an arc or its approximate elliptic arc.

A detailed description will be given below with reference to the drawings. FIG. 1 is a perspective view of a wrap film storage box of the present invention, FIG. 2 is a view showing a saw-like cutting blade of the wrap film storage box of the present invention, and FIG. FIG. 4 is a front view showing an example of FIG. 4, and FIG. 4 is a perspective view explaining the formation of the saw-like cutting blade of the wrap film storage box of the present invention.

As shown in FIG. 1, a wrap film storage box 1
Comprises a case 3 accommodating the wrap film 2 and a saw-tooth cutting blade 4 attached to the longitudinal ridge of the case. The tip portion of the saw-like cutting blade 4 is formed with a curved structure of a rounded or elliptical rounded rounded shape (hereinafter abbreviated as “R” representatively), and the rounded ends 5 and 5 ′ have rounded edges. , R of the central portion 6 is smaller. The radius R of the tip of the saw-like cutting blade used in the present invention is 0.05 at both ends 5, 5'from the viewpoint of cutting property and safety.
If it is less than 0.1 mm, the cutting performance is good, but it is very easy to damage the hands and fingers, and if it is more than 0.15 mm, the cutting resistance at the beginning of cutting is too large and it is difficult to cut. Since R is 0.05 mm or more,
0.15 mm or less, preferably 0.08 to 0.13 mm
Is the range. Further, in the central portion 6, when the thickness is 0.15 mm or less, a hand or a finger may be accidentally pinched and damaged, and the safety in the central portion cannot be maintained.
When it is larger than mm, the cutting resistance is large and it is difficult to cut at the central portion, so R is larger than 0.15 mm and 0.3 mm or less, preferably 0.18 to 0.2.
The range is 5 mm.

In FIG. 1, the wrap film 2 pulled out from the case 3 is cut by the saw-like cutting blade 4,
At that time, the wrap film 2 is pressed against the longitudinal end portion 5 of the sawtooth cutting blade 4 to start cutting, and then to the central portion 6,
Finally, it cuts to the end 5'and is cut. At this time, since the lengthwise dimension of the saw-tooth cutting blade 4 is usually longer than the widthwise dimension of the wrap film 2, the tip of the blade can surely come into contact with the film 2 at the start of cutting, and the R of the end portion 5 is R. Is 0.0
Since it is formed to be 5 mm or more and 0.15 mm or less,
The cutting resistance when starting to cut the wrap film 2 is extremely small, and it is possible to easily start cutting. When the wrap film 2 is further cut, it reaches the central portion 6 and can continue to be cut, but the R of the central portion 6 is larger than 0.15 mm,
Since it is formed to have a thickness of 0.3 mm or less, a good sharpness can be provided in the central portion. Therefore, it is possible to give a good and stable sharpness feeling as a whole and to cut.

FIG. 2 is a view showing an embodiment of a saw-like cutting blade used in the wrap film storage box of the present invention.
As shown in (a), the tip of the saw-like cutting blade 4 is composed of a central portion 6 having different R and both end portions 5 and 5 ', and is fixed to the case at the longitudinal central portion of the cutting blade 4. A stop hole 7 is provided for this purpose. R of both ends 5, 5'is 0.05 m
Specific R selected from the range from m to 0.15 mm
And R in the central part is larger than 0.15 mm and is 0.2
It is a specific R selected from the range of 5 mm or less. Also,
The ratio of the lengths of the both end portions 5, 5'to the central portion 6 is, for example, when the width dimension of the wrap film is 300 mm,
It is desirable that the length of the saw-like cutting blade 4 is about 305 mm and the length of both ends is about 20 mm, but the length is not particularly limited to this, and the length of both ends is 5, 5 '. Should be set to the minimum necessary length to make contact when starting to cut the wrap film. For this reason, at both end portions where R is smaller than the central portion, the length is formed to be the minimum necessary portion, so that there is almost no effect on safety. FIG. 2 (b) is an enlarged view of the tip portion at both ends 5, 5'of FIG. 2 (a), and the blade edge angle is indicated by θ ₁ . R is 0.05 mm or more, regardless of the range of θ ₁ .
It is set within a range of 0.15 mm or less. Also, FIG.
2C is an enlarged view of the tip portion in the central portion 6 of FIG. 2A, and the blade edge angle is indicated by θ ₂ . R is set to a specific R selected from a range of greater than 0.15 mm and 0.25 mm or less regardless of the range of θ ₂ .

FIG. 3 is a front view of a saw-like cutting blade showing an embodiment different from that shown in FIG. 2 (a). The tip end of the saw-like cutting blade 4 has a central portion 6 having different R and both end portions 5, 5. 5 '. R of both ends 5, 5'is 0.05 mm or more,
0.15 mm or less , less than 0.05 mm
If this happens, it will be cut too easily and it will be easy to damage your hands or fingers.
If it exceeds mm, the cutting resistance at the beginning of cutting increases and
It tastes bad. In addition, R of the central portion is larger than 0.15 mm and within a range of 0.30 mm or less,
If so, the sharpness of the central part is too good and the force applied to the film is
If it is not dispersed and exceeds 0.30 mm, the sharpness becomes poor.
It In this figure, the cutting edge pitch A at both ends 5, 5 ′ is made larger than the pitch B at the central portion 6. These pitches are usually provided when the length of the sawtooth cutting blade 4 is 305 mm,
The pitch A is in the range of 1.5 to 2.0 mm and the pitch B is 1.
The range of 0 to 1.5 mm is preferable, and since the pitch A at both ends is larger than the pitch B at the central part, when the edges of the wrap film are pressed against the blade to start cutting, the number of cutting edges is small Since such load is not distributed,
It is extremely easy to start cutting.

FIG. 4 is a view showing molding of the saw-like cutting blade of the wrap film storage box of the present invention, which can be carried out by a method similar to the conventional punching method. That is, a tin plate 9 having a thickness of usually 0.15 to 0.5 mm, preferably 0.18 to 0.25 mm is placed on the base 8 and a punching member 10 formed in a desired R in advance.
By moving in the direction of the arrow, the tin plate can be punched in a sliding manner. The saw-tooth cutting blade thus obtained is struck and fixed to a case (storage box cardboard) by a process called edging to obtain a wrap film storage box.

[0011]

According to the wrap film accommodating box of the action present invention, since R of the tip portion of the saw-like cutting blade is smaller at both ends than the central portion, a very small cutting resistance during the cutting start, even with a small force as a whole A uniform sharpness is obtained, and in addition, the one with the pitch of the cutting edge larger than both ends than the central part has a small number of cutting edges, so the load applied to the film especially when pressing the end of the wrap film to start cutting. Since it is not dispersed, it is extremely easy to start cutting.

[0012]

Example 1 A wrap film storage box having a saw-shaped cutting blade with a total length of 305 mm in which a wrap film having a width dimension of 300 mm and a thickness of 10 μm is stored has a length of both ends of the cutting blade of 20 mm. , R is 0.10 mm at both ends and 0.20 mm at the central part, and the pitch of the cutting edges at both ends is 1.55 mm and the pitch of the central cutting edges is 1.45 mm. There is. When the wrap film was cut using this saw-like cutting blade and the cutting resistance was measured as a load value, the results shown in FIG. 5 were obtained.

Comparative Example 1 Next, in a wrap film storage box having the same dimensions as in Example 1, the tip of the cutting blade was formed to have a radius R of 0.20 mm and a blade edge pitch of 1.5 mm. When the wrap film was cut using this saw-like cutting blade, the results shown in FIG. 5 were obtained. In comparison with Comparative Example 1, Example 1 had extremely small cutting resistance at the beginning of cutting, and the result was that such cutting resistance was small as a whole.

[0014]

According to the wrap film storage box of the present invention, the cutting resistance at the beginning of cutting the wrap film is extremely small, and the entire wrap film can be easily cut. Further, the cutting blade of the storage box of the present invention is industrially advantageous because the conventional molding method is adopted.

[Brief description of drawings]

FIG. 1 is a perspective view of a wrap film storage box of the present invention.

FIG. 2 is a view showing a saw blade of a wrap film storage box of the present invention, (a) is a front view thereof, (b),
(C) is an enlarged view of both ends 5, 5'and the tip of the central portion 6 in (a).

FIG. 3 is a front view showing another example of the saw blade of the wrap film storage box of the present invention.

FIG. 4 is a perspective view illustrating molding of a saw-like cutting blade of the wrap film storage box of the present invention.

[Figure 5] FIG. 5 shows a wrap film using a saw blade.
The relationship between the cutting position and the cutting resistance load when cutting is shown.
It is a graph.

[Explanation of symbols]

 1 Wrap Film Storage Box 2 Wrap Film 3 Case 4 Sawtooth Cutting Blade 5,5 'Both Ends of the Sawtooth Cutting Blade 6 Center of the Sawtooth Cutting Blade 7 Stop Hole 8 Base 9 Tin Plate 10 Punching Member

Claims (1)

[Scope of utility model registration request] 1. A wrap film storage box in which a wrap film stored in a case is pulled out by a required length and is cut by a saw-shaped film cutting blade attached to one ridge of the case. The arc of the tip of the is 0.05mm or more, 0.15mm at both ends in the longitudinal direction.
In an arc with the following radius or its approximate elliptic arc,
A wrap film storage box characterized in that it is formed into an arc having a radius of 0.15 mm or more and 0.3 mm or less or an approximate elliptic arc in the central part.