JP3258482B2 - Storage case for wrap film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case for wrapping a wrap film used for food packaging and the like in a cylindrical shape and storing the wrap film, and more particularly to a wrap film drawn from a case body, which can be cut by a light force. The present invention relates to a wrap film storage case capable of maintaining a spread state of a film.

[0002]

2. Description of the Related Art FIGS. 9 and 10 are perspective views showing a conventional wrap film storage case. FIG. 9 shows a state in which the saw blade is installed at a position where it hits the ridge between the bottom plate and the front side plate. The tear was propagated along the blade and cut to the required length.

[0003] The problem with this storage case is that when the film is cut, the film is cut from one end to the other end, so that the cut free film tends to be crumpled during the cutting. In addition, it is necessary to perform an operation of spreading a cut film before covering it on food or a container. The wrap film is not easy to spread because the film itself is sticky.

[0004] In order to improve such a drawback, it has been proposed that a saw blade is installed at the tip of the cover piece as shown in FIG. 10 and the tip of the cover piece projects in a V-shape at the center. (Japanese Patent Publication No. 4-19092). This is a method in which the drawn film is spread over food and containers and covered, and then the film is pulled up slightly and cut, or the storage case is twisted and cut with a tear from the center. Since the light propagates from the center to the edge of the film, both ends of the film are held until the end of cutting, and there is an advantage that wrinkles are less likely to occur.

[0005]

A storage case as shown in FIG. 10 has been proposed, and the operation of covering a food or a container has become somewhat smooth, but the sharpness when cutting a film with a saw blade is still insufficient. Did not.

[0006] Specifically, A tear is made at the center of the film at the center of the saw blade, but the resistance to tearing is large. 2. After the tear is formed, the tear spreads in both the left and right directions (indicated by arrows in FIG. 10), but the sharpness decreases and the sense of resistance increases nearer to both ends of the box. The present invention has been made to improve the above two points of cutting properties.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a case for accommodating a cylindrically wound wrap film, which is provided with an openable / closable cover for covering an opening of a box-shaped case body. At the tip of the plate, a cover piece that overlaps with the front plate of the case body is connected continuously, and a cutting member with a saw blade at the tip is attached to the tip edge of the cover piece, and this cutting member has an angle at the middle part. It has a protruding shape of 60-160 °,
The cutting member extends obliquely in a direction away from the bottom and the bottom or horizontal from the center toward the end, and the cutting member is further inclined near the end,
The wrap film storage case is characterized in that the inclination angle is 15 to 75 °.

An example of the storage case of the present invention will be described below with reference to the drawings. In the drawings used in the following description, the saw blade is omitted. FIG. 1 is a front view showing an example of the storage case of the present invention, FIG. 2 is a front view (a) and a side view (b) showing an example of the storage case of the present invention, and FIGS. 9 and 10 are front views showing an example of a conventional storage case. In the figure, 1 is a storage case, 2 is a case main body, 3 is a back plate, 4 is a cover plate, 5 is a front plate, 6 is a cover piece, 7 is a lid, 8 is a cutting member, 9 is a bottom plate,
Reference numeral 10 denotes each end plate.

A storage case 1 for a wrap film according to the present invention has an openable and closable lid 7 covering an opening of a box-shaped case main body 2 and a cover piece overlapping the front side plate 9 of the case main body 2 at the tip of the lid 7. 6 are connected in series. The central part of the tip of the cover piece 6 is the bottom of the case body 2 (bottom plate 9).
Is provided with a saw blade-shaped cutting member 8 protruding toward.

[0010] When cutting the wrap film, the wrap film is pulled up or the storage case is twisted.
The central portion of the wrap film protrudes, so that a stronger force is intensively applied to the central portion of the wrap film than the other portions.

Thus, the first breach enters the central portion of the film due to the concentrated application of force to the central portion of the film. In order to reduce the resistance at this time, that is, to increase the concentration of stress, as shown in FIGS. 1 to 8, the tip angle of the projecting portion of the cutting member 8 (saw blade) at the tip of the cover piece 6, FIG. In 1, the angle indicated by θ ₁ is important. θ ₁ is 60 to 16
When the angle is 0 degrees, preferably 60 to 150 degrees, the sharpness is light and good. difficult to use a large resistance feeling during cutting when the theta ₁ exceeds 160 degrees.

Next, the easiness of cutting after a nick is formed in the central portion will be described with reference to FIG. By twisting the storage case while pulling the film, a force or F is applied obliquely in a direction between the positive y direction and the positive z direction (FIG. 2B). However, the component of the force that the saw blade contributes to cutting the film is a component F _xy parallel to the paper surface. Therefore, the following description will be made only with respect to the component parallel to the sheet.

In FIG. 2A, the center position of the saw blade is point O, and the position where the film is held is point P. First, a tear is formed from the center of the film. . At point A, a force is applied in the direction from point A to point P. Furthermore, when the rift is transmitted and reaches point B, the force is B
Point → P point is added. Of the applied force _Fxy ,
For cutting, a component in a direction perpendicular to the saw blade (a direction perpendicular to OB in FIG. 2A) effectively contributes.
Therefore, the greater the angle between the applied force _Fxy and the saw blade (θ _{A in} the case of point _A ), the smoother the cut.

As a phenomenon supporting the above explanation, when the cut point of the split is near the center, the cut is light and smooth, but the resistance increases as the cut point spreads right and left, and the resistance is maximized at the end of cutting. Becomes That is, the angle between the applied force _Fxy and the saw blade becomes smaller at both ends of the box.
As a countermeasure against this, it is effective to increase the angle θ _C between the x-axis and the saw blade. By increasing θ _C , the angle between the force F _xy applied to the film and the saw blade increases, making it easier to cut smoothly.

That is, cutting is smoothly performed by changing the shape of the saw blade continuously or stepwise so as to increase the inclination with respect to the base and gradually increasing θ _C. Will be. However, this method is also limited due to the two-dimensional constraints of the length L and height H of the storage case and the fact that the smaller the central angle θ ₁ is, the easier it is for the first tear to occur. An improvement method for that will be described with reference to FIG.

Although the relationship between the ease of cutting the film and the angle of the direction in which the film is pulled has been described above, it is particularly difficult to cut the film in such a way that the cutting point spreads right and left and ends at the end, that is, both ends of the storage case. It is a position close to. Even in the middle stage, the pulling direction, that is, the angle is gradually decreasing, but the angle θ _A formed by the saw blade and the direction from the cutting point A near the center to the point P holding the film is relatively small. It is large and can be cut lightly. If this angle is less than 65 degrees, it becomes difficult to cut sharply, so it is necessary to devise the shape of the saw blade. It is assumed that the distance between the center point O of the saw blade and the position point P having the film is about 150 mm. The reason for setting the distance between the OPs to 150 mm is that it is an average distance at which the wrap film is usually pulled out of the box in the actual scene. It is clear that the larger the angle θ ₁ of the V-shape in the center is, the better the first split in the center can enter with a small force.

In consideration of the above, it is conceivable to provide a protruding blade for generating a cutting start point at the center of the cutting member as shown in FIGS. That is, the central part a is set at a small angle θ ₁ at the tip of the central part to make it easier to make the first tear, and the parts b and b ′ on both sides are once returned to a direction parallel or nearly parallel to the y-axis. Keep it. Therefore, although θ _C once decreases in the portions B and B ′, the portions C and C ′ on both sides thereof are inclined again to increase θ _C to cover the difficulty of cutting at both ends. It is also effective that this part besides a straight line is curved or inclined stepwise (see FIG. 7,
See FIG. 8). As described above, it is possible to consistently and smoothly cut from the beginning of the initial tearing to the end of the cutting.

Numerical description will be made in the case shown in FIGS. 5 and 6. If the angle θ ₁ of the tip of the central portion A is 60 to 16
When the angle is 0 degrees, preferably 60 to 150 degrees, a light crack is formed and good. In addition, the inclination angle θ _C near the end of the cutting member whose inclination is increased (portions C and C ′ in FIGS. 5 and 6).
Is preferably 15 to 75 degrees, and more preferably 20 to 75 degrees.

Also, the central part (a) of the cutting member for initially breaking the film, the parts (b) and (b) returned to the direction parallel or nearly parallel to the x-axis, the parts (c) and (c) close to the both ends where the inclination is steep again The ratio of the length of the portion 'is described below in the case of a storage case having a general film width of 300 mm. For a commercially available wrap film, the standard size of the storage case for a film width of 300 mm is a height H of about 50 mm and a length L of about 310 mm.

The length of each part changes depending on how the angles of the parts a, b and b 'and c and c' are set, but the following is fundamental. The part of A that starts to rip does not need much length once it rips. Conversely, if the portion A is lengthened, it becomes difficult to secure portions C and C 'at both ends which are difficult to cut. Therefore, it is a guideline for a within 50 mm.

Next, regarding the lengths of the portions C and C ', this portion is an important point for ensuring the ease of cutting when cutting the film, and the length of this portion is insufficient. It is fatal to increase the difficult-to-cut parts. Saw blade and the length of the film from the relationship between the direction F _xy angle of the force pulling the Ha 30 mm or more, preferably good than 45 mm.
The same applies to c ′. Therefore, when the length of the entire case is L, the ratio of I / B + B ′ / C + C ′ is 0.02L or more.
0.17L / 0.23L ~ 0.79L / 0.19L ~
0.75 L, preferably 0.03 L to 0.13 L / 0.
The range of 37L to 0.72L / 0.25L to 0.50L is appropriate.

Recently, mini-types having a width of 200 mm or 150 mm have been sold to satisfy various requirements for the width of a wrap film, but basically the same concept can be applied.

The technical contents of the storage case described above can be applied to various films regardless of the material of the film. For example, polyvinylidene chloride, polyvinyl chloride,
Any effect such as polyethylene, polypropylene, or multilayered using multiple materials can be obtained,
It is particularly effective for the conventional storage case shown in FIG. 2 which has a large resistance when cutting.

[0024]

According to the present invention, the unwound film is put on the food or container to be covered according to the present invention, and the film is lightly pulled or, in addition, the storage case is twisted neatly from the center of the film to both sides. Can be. Therefore, after cutting, the film is no longer wrinkled or twisted and adheres to each other, so that the cut film is covered with the object to be packaged in a state in which the film is spread in a clean state, and the film is easy to use.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a storage case of the present invention.

FIG. 2 is a front view (a) and a side view (b) showing an example of the storage case of the present invention.

FIG. 3 is a front view showing an example of the storage case of the present invention.

FIG. 4 is a front view showing an example of the storage case of the present invention.

FIG. 5 is a front view showing an example of the storage case of the present invention.

FIG. 6 is a front view showing an example of the storage case of the present invention.

FIG. 7 is a front view showing an example of the storage case of the present invention.

FIG. 8 is a front view showing an example of the storage case of the present invention.

FIG. 9 is a front view showing an example of a conventional storage case.

FIG. 10 is a front view showing an example of a conventional storage case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage case 2 Case main body 3 Back plate 4 Cover plate 5 Front side plate 6 Cover piece 7 Lid 8 Cutting member 9 Bottom plate 10 End plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masamichi Kuwamoto 3-10 Ushidori, Kurashiki-shi, Okayama Pref. Inspector, Mizushima Plant, Mitsubishi Kasei Co., Ltd. Yukio Maeda (56) References JP-A-3-187839 (JP) JP-A-4-6039 (JP, A) JP-A-5-13927 (JP, U) JP-A-58-59721 (JP, U) JP-A-3-26719 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 5/72 B65D 25/52

Claims (4)

(57) [Claims] 1. A case for storing a wrap film wound in a cylindrical shape, wherein an openable cover is provided to cover an opening of a box-shaped case body, and a front plate of the case body is provided at a tip of the cover. And a cover member with a sawtooth-shaped tip attached to the tip edge of the cover member, and the cutting member has a protruding shape with an angle of 60 to 160 ° at the center, From the center to the end, the cutting member
The wrap film is characterized in that it extends in a direction horizontal to or away from the base and inclines in a direction away from the base, and the cutting member has a larger inclination with respect to the base in the vicinity of the end, and the inclination angle is 15 to 75 °. Storage case. 2. The method according to claim 1, wherein the inclination angle formed between both ends of the cutting member and the bottom of the case body increases continuously or stepwise toward the end of the cutting member. The storage case for the wrap film described. 3. The wrap film storage case according to claim 1, wherein the angle of the protruding portion at the center of the cutting member is 60 to 150 °. 4. The wrap film storage case according to claim 1, wherein an angle between both ends of the cutting member and a bottom side of the case body is 20 to 75 °.