JP6478657B2 - Cutting blade and film roll storage container - Google Patents

Description

  The present invention is particularly provided in a film roll storage container for storing a film roll formed by winding a wrap film for food packaging, an aluminum foil, a cooking sheet or the like (hereinafter referred to as “film”). The present invention relates to a cutting blade for cutting a film drawn from a film roll, and a film roll storage container.

  Usually, a film is wound around a paper core to form a film roll, and the film roll is stored in a paper rectangular parallelepiped film roll storage container. A film roll storage container usually has a storage portion that opens to store the film roll and a lid portion that opens and closes the upper surface opening, and the film drawn from the film roll is cut at the tip of the lid portion. A cutting blade is provided. The cutting blade is usually formed in a long shape along the longitudinal direction of the lid.

  Since the film is cut and used by the user each time, the cutting blade of the film roll storage container needs to have excellent cutting properties and safety that does not injure the user. As for the cutting property, for example, there is a technique for projecting the central portion of the cutting blade (see Patent Documents 1 and 2).

JP 2010-247873 A JP-A-5-246426

  However, sufficient safety cannot be ensured simply by protruding the central portion of the cutting blade. Further, depending on the projected shape, sufficient cutting properties cannot be obtained.

  The present application has been made in view of such a point, and an object thereof is to ensure sufficient safety that does not injure the user while realizing sufficient cutting performance of the cutting blade provided in the film roll storage container. .

As a result of intensive research, the inventors have made the central part of the cutting blade protrude in a substantially trapezoidal shape, set the length of the straight part of the upper base of the trapezoid to a value within a predetermined range, and change the both ends of the straight part. It has been found that the above-mentioned problems can be solved by setting the angle to a predetermined value or less, and the present invention has been completed. That is, the aspect of this invention contains the following.
(1) A cutting blade provided in an elongated shape along the longitudinal direction of the film roll storage container, for cutting the film drawn from the film roll of the film roll storage container, and at the center in the longitudinal direction And a convex portion projecting in a direction opposite to the drawn film, the convex portion having a substantially trapezoidal shape having a flat linear portion on a distal end side, and the length of the linear portion is a cutting blade A cutting blade that is 1% or more and 5% or less of the length in the longitudinal direction, and the variation angle at both ends of the linear portion is 7 degrees or less.
(2) The cutting blade according to (1), having convex portions protruding in opposite directions to the drawn film at both ends in the longitudinal direction.
(3) A film roll storage container having the cutting blade according to any one of (1) and (2).

  ADVANTAGE OF THE INVENTION According to this invention, the safety | security which does not injure a user is securable, implement | achieving sufficient cut property of the cutting blade provided in a film roll storage container.

It is a perspective view which shows the outline of the film roll storage apparatus of this invention. It is an expanded view of a film roll storage container. It is explanatory drawing which shows the cutting blade attached to the back surface of the lid piece. It is an enlarged view of the convex part of the center of a cutting blade. It is explanatory drawing which shows the shape of several teeth of a cutting blade. It is explanatory drawing of the experiment of the cut property of an Example.

  The present invention will be specifically described below. In addition, the following embodiment is an illustration for demonstrating this invention, and this invention is not limited only to the embodiment. The same reference numerals are assigned to the same elements, and duplicate descriptions are omitted. In the drawings, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios.

  FIG. 1 is a perspective view showing an outline of a film roll storage container 1 having a cutting blade 50 according to the present embodiment, and FIG. 2 is a development view of the surface side of the film roll storage container 1 of FIG. .

  A film roll storage container 1 shown in FIG. 1 has a storage portion 10 that is open on the top surface and can store a tubular film roll R, and a lid portion 11 that can open and close the top surface opening of the storage portion 10. The storage unit 10 includes, for example, a front plate 20, a bottom plate 21, a rear plate 22, side plates 23 connected to both ends in the longitudinal direction of the bottom plate 21, and auxiliary armpits connected to both ends in the longitudinal direction of the rear plate 22. A plate 24 and auxiliary side plates 25 connected to both ends of the front plate 20 are provided. An edge fold piece 26 that is folded back on the back side of the front plate 20 is connected to the upper edge of the front plate 20, and guide pieces 27 are connected to both sides of the edge fold piece 26 in the longitudinal direction. The edge fold piece 26 may or may not be present, and may be adhered to the back surface of the front plate 20. Further, on the surface of the front plate 20, for example, a temporary fixing portion 28 for temporarily fixing an end portion of the film F is provided.

  The lid portion 11 extends from the upper end edge of the rear plate 22 of the storage portion 10 in a direction covering the upper surface opening of the storage portion 10, and extends from the lid plate 30 to the front plate 20 side of the storage portion 10. The lid cover piece 31, the side plates 32 connected to the longitudinal ends of the lid plate 30, the auxiliary side plates 33 connected to the longitudinal ends of the lid cover piece 31, and the distal ends of the lid cover pieces 31. And has an open piece 34.

  As shown in FIG. 2, the opening piece 34 is formed in a strip shape along the longitudinal direction of the film roll storage container 1. The opening piece 34 is connected to the distal end edge of the lid cover piece 31 via a cut line 35. Before opening, the opening piece 34 is bonded to the lower surface of the front plate 20. The lid 11 is sealed by the opening piece 34, and the lid 11 can be opened by cutting the opening piece 34 along the cut line 35.

  As shown in FIGS. 1 and 3, a cutting blade 50 for cutting the film F drawn from the film roll R of the storage unit 10 is provided on the back side of the distal end portion of the lid cover piece 31. The cutting blade 50 is attached to the lid lid piece 31 with an adhesive, for example. The cutting blade 50 is formed in, for example, a long rectangular shape having a saw blade shape on one side, and is provided across both longitudinal ends of the film roll storage container 1 (the lid cover piece 31). The cutting blade 50 is covered with the opening piece 34 before the opening piece 34 is cut off, and is exposed at the leading edge of the lid piece 31 when the opening piece 34 is cut off. The material of the cutting blade 50 is a metal material such as tinplate.

  The cutting blade 50 has a convex portion 60 that protrudes in a direction opposite to the drawn film F at a central portion 50a in the longitudinal direction. As shown in FIG. 4, the convex part 60 has a substantially trapezoidal shape having a flat straight part 70 on the tip side. The length L1 of the straight portion 70 is 1% or more and 5% or less, preferably 1% or more and 4% or less, more preferably 1.5% or more and 3% or less of the length (full width) D of the cutting blade 50 in the longitudinal direction. 5% or less. In addition, by making the length L1 of the straight portion 70 1% or more, it is possible to drastically improve the difficulty of injury when contacting the tip, and by making it 1.5% or more, the convex portion 60 is provided. Can improve the injury resistance to the same extent as no cutting blade. On the other hand, if the length L1 of the straight portion 70 is 5% or less, the center starting point can be cut with a light force, and if it is 4% or less, the center starting point can be cut with a lighter force. If this is the case, the central starting point can be cut with the same level of force as when the straight portion 70 is not provided. Note that the tooth shape of the cutting blade 50 is not particularly limited as shown in FIGS. 5A to 5D, and the portion where the line connecting the tips of the tooth crests is a straight line is the straight portion 70. And its length is L1.

Both ends of the convex portion 60 are smoothly connected in an arc shape with the outer cutting blade 50 portion. In addition, both ends of the linear portion 70 are smoothly connected in an arc shape with the outer convex portion 60 (inclined portion). The variation angle α1 at both ends of the convex portion 60 and the variation angle α2 at both ends of the linear portion 70 are set to 7 degrees or less. The maximum variation H of the tooth side edge of the cutting blade 50 is
It is 10 mm or less, preferably 5 mm or less. The smaller the maximum variation H, the smaller the width of the lid cover piece 31 and the opening piece 34 can be maintained. The maximum fluctuation amount H is determined by the way of taking the fluctuation angles α1 and α2. In order to reduce the maximum fluctuation amount H, a linear portion may be provided as appropriate in addition to the central portion. In addition, both ends of the convex part 60 and both ends of the linear part 70 do not necessarily need to be arc-shaped, and may be corners.

  As shown in FIG. 3, the cutting blade 50 further has convex portions 80 protruding in opposite directions to the drawn film F at both end portions 50 b in the longitudinal direction. Therefore, the cutting blade 50 has the convex parts 60 and 80 in the center part 50a and the both ends 50b, respectively, and has a substantially M shape as a whole.

  For example, a PVDC film F is wound around the film roll R. The film roll R is stored in the film roll storage container 1 to constitute a food packaging apparatus.

  When the user takes out the film F from the film roll storage container 1 and uses it, for example, the film roll storage container 1 is first held almost horizontally with one hand, the cover 11 is lightly closed, and the film is held with the other hand. A film F having a desired length is pulled out from the film roll R in the roll container 1. Next, the drawn film F is pulled upward, and the film F is cut by the cutting blade 50 at the tip of the lid cover piece 31 of the lid portion 11. At this time, the film F is cut starting from the convex portion 60 at the center of the cutting blade 50 or starting from the convex portion 80 at the end of the cutting blade 50. The film F remaining after the cutting is stuck to the temporary fixing portion 28 and temporarily fixed. When the next use is performed, the film F attached to the temporary fixing portion 28 is pulled out.

  According to the present embodiment, the cutting blade 50 has the substantially trapezoidal convex portion 60 at the central portion 50 a in the longitudinal direction, and the length L 1 of the straight portion 70 of the convex portion 60 is the longitudinal length of the cutting blade 50. It is 1% or more and 5% or less of the length D in the direction, and the variation angle α2 at both ends of the linear portion 70 is 7 degrees or less. In this case, the convex portion 60 has a substantially trapezoidal shape, so that it is possible to improve the difficulty of being injured when contacting the tip, and the length L1 of the trapezoidal straight portion 70 is set to be relatively short from 1% to 5%. By doing so, it is possible to cut the film from the center with a light force. In particular, the fluctuation angle α2 at both ends of the linear portion 70 is 7 degrees or less, and the convex portion 60 at the center of the cutting blade 50 becomes a gentle and smooth curved shape. When the film is cut from one end of the cutting blade 50, it is considered that the load (load) rises at the moment when the cut portion passes through both ends of the straight portion 70, but by setting both ends of the straight portion 70 to 7 degrees or less. In this case, an increase in load is suppressed to a small level, and a good cutting property can be obtained. Therefore, sufficient safety | security which does not injure a user is realizable, implement | achieving sufficient cuttability of the cutting blade 50. FIG. In addition, since the convex part 60 of the cutting blade 50 is a gentle curve, for example, stress does not concentrate on one tooth crest at both ends of the straight part 70, and wear of the tooth crest due to repeated use can be suppressed. In addition, it verifies in the below-mentioned Example that sufficient cutting property of the cutting blade 50 is implement | achieved and safety | security is ensured.

  Moreover, the cutting blade 50 has the convex part 80 which protrudes in the direction opposite to the drawn-out film F in the both ends of a longitudinal direction. Thereby, the cut property of the film F at the time of cutting the film F from the edge part of the cutting blade 50 can be improved.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  The cutting blade 50 in the above embodiment has the saw blade formed on one side, but the saw blade may be formed on the other side. Moreover, the shape of the teeth of the cutting blade 50 is not particularly limited. Moreover, although the above-mentioned cutting blade 50 has a substantially M-shape as a whole, it may have other shapes as long as it has a trapezoidal convex portion 60 at the center. . For example, both ends of the cutting blade 50 may be flat or may be formed so as to recede with respect to the film F.

  The shape and structure of the film roll storage container 1 in the above embodiment are not limited to this. Further, the type of the film F wound around the film roll R is not limited to the PVDC type, and may be, for example, a PO type or a PVC type.

  Hereinafter, the cutting performance and safety of the cutting blade 50 will be verified.

(Cutability)
As shown in FIG. 6, the film is cut from the center of the cutting blade (the position where the convex portion 60 is located) as a starting point, and the center starting cutting experiment for obtaining the load necessary for the cutting, and the film starting from the end of the cutting blade An edge starting point cut experiment was performed to obtain the maximum load required for the cut. The former center start cutting experiment was conducted without tilting the film roll storage container with respect to the film pulling direction (the film pulling direction and the width direction of the film roll storage container are set in the same direction). In the latter end portion starting point cutting experiment, the film roll storage container was inclined by 25 degrees with respect to the film pulling direction (the angle between the film pulling direction and the width direction of the film roll storage container was set to 25 degrees).

(Cutability evaluation method)
(1) A tin-made cutting blade created by wire cutting is attached to a Saran Wrap Cosmetic Box (registered trademark, manufactured by Asahi Kasei Home Products Co., Ltd.), a film roll is put in the box, and the autograph is used at 1 m / min. The film was taken out and the load from the start to the end of the cut was recorded, and this was performed a total of 5 times. The average value of the load at the start of cutting 5 times was taken as the load at the start of cutting of the cutting blade. If the load at the start of cutting at the center starting point is 3.5 N or less, the cutting performance is good.
(2) Evaluation was performed by simulation using a finite element method. The film was taken out at a center starting point cut of 10 m / min and an edge starting point cut of 100 m / min, and the load from the start to the end of the cut was recorded. If the load at the start of cutting at the center starting point is 5 N or less, the cutting performance was good. The edge starting point cut was considered to have good cutting properties when the load at the time of passing through the center was 1 N or less.

  In the center-origin cut experiment, when the length of the straight portion 70 of the trapezoidal convex portion 60 is 5% or less of the length (full width) in the longitudinal direction of the cutting blade, the maximum cut load is 3.5 N or less, When exceeding 5% of the length in the longitudinal direction of the cutting blade, the maximum cutting load exceeded 3.5N. When the length of the straight portion 70 of the convex portion 60 is set to 5% or less of the length in the longitudinal direction of the cutting blade by this center starting point cutting experiment, the length exceeds 5% of the length in the longitudinal direction of the cutting blade. In comparison, it was found that extremely high cutting properties can be obtained.

  As shown in Table 3, if a protrusion protruding in the direction opposite to the film is provided, the central starting point can be cut, and if the variation angle α1 is 3 degrees or more, the central starting point can be cut at 5 N or less. More preferred. If the variation angle α2 is 7 degrees or less, an increase in load when passing through the end portion of the linear portion 70 when the end portion starting point is cut can be suppressed to 1 N or less.

(safety)
With the cutting blades with different shapes such as the length of the straight part facing upward, a film roll with a weight of 300 g is placed on the central convex part of the cutting blade, and the film roll is slid from the inside to the outside of the box, The number of films damaged on the film roll surface was counted. This was performed a total of 10 times, and the average value was taken as the number of film scratches on the cutting blade. Since the average number of film scratches was 6 with a linear cutting blade having no projections, it was considered that the resistance to injury was good if it was 6 or less.

  In this experiment, when the length of the straight portion of the convex portion is 0 mm, the number of film scratches is eight, whereas the convex portion has a straight portion of 1% or more of the length in the longitudinal direction of the cutting blade. When it was provided, a clear reduction in the number of film scratches was observed, and it was found that when it was 1.5% or more of the length in the longitudinal direction of the cutting blade, it could be reduced to 6 blades equivalent to a cutting blade having no projection. Moreover, as shown in Table 2, the same tendency was seen also in the cutting blade for wrap films with different full widths.

  INDUSTRIAL APPLICABILITY The present invention is useful for ensuring sufficient safety that does not injure the user while realizing sufficient cutting performance of the cutting blade provided in the film roll storage container.

DESCRIPTION OF SYMBOLS 1 Film roll storage container 50 Cutting blade 60 Convex part 70 Linear part F Film L1 Length of a linear part

Claims (3)

A cutting blade provided in a long shape along the longitudinal direction of the film roll storage container, for cutting the film drawn from the film roll of the film roll storage container,
In the central part in the longitudinal direction, it has a convex part protruding in the direction opposite to the drawn film,
The convex part has a substantially trapezoidal shape having a flat straight part on the tip side,
The length of the straight portion is 1% or more and 5% or less of the length in the longitudinal direction of the cutting blade,
The cutting blade whose fluctuation angle in the both ends of the said linear part is 7 degrees or less.   2. The cutting blade according to claim 1, wherein at both ends in the longitudinal direction, there are convex portions protruding in a direction opposite to the drawn film.   A film roll storage container comprising the cutting blade according to claim 1.

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