JP3348463B2 - Packaging material cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrapping material cutter, and more particularly to a wrapping material which can easily form an opening at a substantially central portion of a wrapping material which covers a hollow portion of a rolled body. About the cutter.

[0002]

2. Description of the Related Art A roll formed by winding a film, paper, or the like on a cylindrical core body is wrapped with a packaging material so that the rolled material is not damaged during transfer. As shown in the cross-sectional view of FIG. 7, the peripheral surface is covered with a protective material, and at both end surfaces thereof, a projection 10 having an opening at the center is provided. A protection plate which is extended and has a donut-shaped dish portion 13 is attached, and furthermore, a band is fixed to the opening of the projection of the protection plate and the hollow portion of the core body. Therefore, when this protective plate is mounted, the protrusion of the protective plate is inserted into the hollow portion of the core of the roll, so that the hollow of the core of the roll 50, as shown in the side sectional view of FIG. It is necessary to open the packaging material 60 covering the part 41.

Conventionally, a cutter shown in the perspective view of FIG. 2 has been used to form an opening in the packaging material. This cutter 30 is composed of a gripping portion 7 and four right-angled triangular blades 1 provided with a blade portion 4 on a hypotenuse portion. In this manner, the tip 5 of each blade 1 is concentrated at one point.

[0004]

As shown in FIG. 4, when the distal end 5 of the cutter having the above-mentioned structure comes into contact with the wrapping material 60 and is pressed in the direction of the arrow, the wrapping is performed by the concentrated distal end 5 at one point. The contact portion with the material 60 is pierced to form an opening. However, packaging materials are usually unstretched polypropylene film, low density polyethylene film (LDP)
E) Since it is a stretchable synthetic resin film such as a high-density polyethylene film (LLDPE), when the cutter is pushed in, the packaging material is stretched and the stretched packaging material is cut by the blade. The opening cannot be enlarged. As a result, only a small opening 63 can be formed in the packaging material as shown in the front view of FIG. 6, so that it becomes difficult to insert the projection when the protection plate is mounted, and the protection plate mounting efficiency is reduced. There was a problem of inferiority. An object of the present invention is to solve the above problem and provide a packaging material cutter capable of forming an opening for easily inserting a projection of a protective plate in a packaging material covering a hollow portion of a core of a roll. .

[0005]

According to the present invention, there is provided a packaging material cutter having three or more triangular blades having a tip angle of 25 to 65 degrees and having a blade portion on at least one side sandwiching the tip angle. The blades are radially attached to a substantially central portion of one end surface of the grip portion with the blade portions facing each other, preferably,
The triangular blade is a right-angled triangle having a blade portion provided on a hypotenuse portion, and the blade portions are attached to each other in a cross shape so as to face each other.

[0006]

According to the above construction, since three or more triangular blades having a sharp tip angle are radially attached to one end surface of the grip portion, three or more tip portions are formed. The tip breaks through three or more places of the packaging material, and further cuts the packaging material with the triangular blade. Therefore, when the packaging material is first pierced, the size of the opening is determined. Therefore, even if the packaging material is elongated, the opening can be easily and reliably formed, thereby protecting the packaging material. Mounting of the plate becomes easy.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a packaging material cutter showing one embodiment of the present invention. The same parts as those of the conventional packaging material cutter described with reference to FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. 2 is different from the cutter of FIG. 2 in that a right-angled triangular blade 1 having four blades 4 provided on the oblique sides thereof is disposed substantially at the center of one end face 8 of a gripper 7 with the blades 4 facing each other. That is, the tip of the blade is dispersed in four places.

As described above, the packaging material cutter of the present invention is characterized in that the tips of the blades are dispersed at three or more places. According to this configuration, as shown in the side sectional view of FIG. When the wrapping material cutter 20 is brought into contact with the wrapping material 60 covering the core hollow portion 41 of the roll-shaped body 50 and pressed in the direction of the arrow, first, the blade tip portion 5 breaks through four portions of the wrapping material contacting portion. Further, by further pushing the cutter 20, the packaging material is cut at each blade portion 4, and the packaging material can be cut in a cross shape as shown in the front view of FIG.
Therefore, the protrusion of the end surface protection plate can be easily inserted into the opening 61 of the cross-shaped packaging material, and the protection plate can be easily attached.

In the above example, a right-angled triangular blade having a blade portion provided on the oblique side is used as the triangular blade, but in the present invention, as shown in the front view of FIG.
It is preferable that a triangular blade such as a triangle, an isosceles triangle, or an equilateral triangle having a blade portion 4 on at least one side sandwiching the tip angle θ, and preferably on both sides, is suitable. Used for If the tip angle is less than 25 degrees, the blade edge is bent or the amount of pushing into the required opening increases, while if it exceeds 65 degrees, if the packaging film is slack, the packaging film is pushed without opening. It is not preferable because the opening tends to be defective.

Further, in the present invention, three or more triangular blades are provided on one end surface of a gripping portion such as a cylindrical body or a polygonal body.
It is fitted or adhered radially from approximately the center. In addition, if many triangular blades are used, the cost increases. Therefore, the number of the triangular blades may be determined in consideration of the opening efficiency of the packaging material and the cost. In the present invention, in particular, when a right-angled triangular blade having a blade portion provided on four oblique sides is attached in a cross shape substantially at the center of one end surface of the grip portion with the blade portions facing each other, It is preferable because the tip portion can be located at the outermost position, and the maximum opening in which the packaging material is cut in a cross shape can be formed.

[0011] The packaging material cutter of the present invention is made to have a size such that at least the blade can be inserted into the hollow portion of the core of the roll. Since the triangular blade is radially attached, the length of the bottom is determined by the diameter of the core hollow portion of the roll, and the length is less than half the diameter of the core hollow portion. Is done. The diameter of the cross section or the length of the diagonal line of the gripping portion is not particularly limited, and when the length is smaller than the inner diameter of the core hollow portion of the roll, the entire packaging material cutter can be inserted into the core hollow portion. On the other hand, when the length is larger than the inner diameter of the hollow portion of the core body of the roll-shaped body, it functions as a stopper when the cutter is used.

Hereinafter, the present invention will be described more specifically with reference to experimental examples.

[Experimental example] Four blades, each having a cutting edge formed on the hypotenuse of a right-angled triangle with a bottom of 3.5 cm and a tip angle of 30 degrees, were cut into a 7c diameter
A cylindrical cutter having a length of 10 cm and a length of 10 cm was attached to one end face of the cylindrical body shown in FIG. 1 to produce a packaging material cutter. As the triangular blades, packaging material cutters were produced in the same manner as above except that the tip angles of the right-angled triangular blades were changed as shown in Table 1. On the other hand, for comparison, a packaging material cutter was produced in the same manner except that four blades were attached to the configuration shown in FIG.

Each of the wrapping material cutters prepared above was wound around a cylindrical core having an inner diameter of 7.6 cm, and the film was wound around the center of the hollow body of the LLDPE core which covered both ends of the roll-shaped body entirely wrapped with LLDPE. To break the LLDPE to form an opening. In this experiment, 1,
Openings were formed in 000 rolls. As a result,
The opening success rate was as shown in Table 1. Note that the above-mentioned opening success rate means that when the protective plate shown in FIG. 7 is pressed and attached to the end face of the roll-shaped body where the opening is formed, the protective plate falls.
Indentation capacity that did not or protective plate refers to a number / total pressing times were on 1cm than.

[0014]

[Table 1]

As is apparent from Table 1, the packaging material cutter according to the present invention has a higher opening success rate than the conventional one.
It improved by 10% or more.

The number of blades formed on the hypotenuse of a right-angled triangle having a tip angle of 30 degrees used in the above experimental example is shown in Table 2, and a radial center is formed at the approximate center of one end surface of the cylindrical body. To make a packaging material cutter. The above-prepared packaging material cutters are used to cover the hollow portion of the core of the roll.
The opening was formed by pressing the LDPE substantially at the center to break the LLDPE. In this experiment, 1,0
Openings were formed in the 00 rolls. As a result, the opening formation ratio was as shown in Table 2.

[0017]

[Table 2]

As is apparent from Table 2 above, the packaging material cutter according to the present invention has three or more blades independently, dispersed and released, so that the opening success rate of the packaging film is smaller than that of the conventional blade. It is improved by 10% or more than that of the configuration in which the tip portions are concentrated.

[0019]

As described above, according to the packaging material cutter of the present invention, even if the package is elongated, the package can be easily and reliably opened. Therefore, it is easy to attach the protection plates to both end portions of the wrapped roll, and the efficiency in attaching the protection material can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a packaging material cutter according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a conventional packaging material cutter.

FIG. 3 is a side sectional view showing a breaking operation of the packaging material by the packaging material cutter of the present invention.

FIG. 4 is a side sectional view showing a breaking operation of a packaging material by a conventional packaging material cutter.

FIG. 5 is a front view showing a broken state of the packaging material by the packaging material cutter of the present invention.

FIG. 6 is a front view showing a state in which a packaging material is broken by a conventional packaging material cutter.

FIG. 7 is a cross-sectional view illustrating an example of a roll-shaped end face protection plate.

FIG. 8 is a front view showing an example of a triangular blade.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 blade 4 blade 5 tip 7 grip 8 end face θ tip angle 20 packaging cutter

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B26D 1/00-1/24 B26D 3/08

Claims (2)

(57) [Claims] 1. A triangular blade having a tip angle of 25 to 65 degrees and having at least one edge portion sandwiching the tip angle has three or more triangular blades. Packaging cutter radially attached to the substantially central portion of one end face of the package. 2. The packaging according to claim 1, wherein the triangular blade is a right triangle having a blade portion provided on a hypotenuse portion, and the blade portions are attached in a cross shape with the blade portions facing each other. Wood cutter.