JP3313648B2 - Knife for perforation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforation forming blade used for forming perforations by, for example, a press cutter, and more particularly to a perforation formed on a package used for wrapping a container. It is ensured that the perforation is broken in a specific direction so that the package does not break in a direction deviating from the perforation and forms a perforation that does not impair the appearance of the package even after opening. The present invention relates to a cutting tool for forming perforations.

[0002]

2. Description of the Related Art There is known a cutting tool for forming perforations in which a plurality of linear cutting blades are formed on a same straight line at appropriate intervals along one peripheral edge of a rectangular flat plate-shaped cutting tool body. The perforation formed by such a blade is used, for example, for packaging for wrapping a container filled with cosmetics and seasonings,
By opening the sealing package along the perforations, it is possible to spout out the filling material filled in the container. By the way, in the conventional perforation forming blade, one or both of the side surfaces continuous with the cutting blade are formed as inclined surfaces, and the front and rear ends of the cutting blade are formed as vertical surfaces obtained by cutting the cutting blade from an orthogonal direction. Therefore, when a perforation is formed with such a blade, the shape of the front and rear ends along the longitudinal direction of the perforation becomes T-shaped or hook-shaped,
The perforation breaks from the letter-shaped or hook-shaped tip, making it difficult to open the package in the direction along the perforation, and the package breaks in the direction deviating from the perforation, resulting in poor appearance after opening There is a problem. Therefore, in the tapered blade edge portion, the cutting blade divided into a plurality in the blade width direction and each having an appropriate blade width has a groove recessed into the blade base side between the two adjacent cutting blades. Japanese Utility Model Laid-Open No. 166096 discloses a cutting tool for forming perforations which is formed in a provided state and has an in-groove cutting edge formed at an edge of each groove.

According to this invention, since the front and rear ends of the perforation are cut by the in-groove cutting edge, the front and rear ends of the perforation are not formed in a hook shape or a T-shape. There is a feature that the breaking can be performed.

[0004]

However, the conventional perforation forming blade disclosed in Japanese Utility Model Laid-Open Publication No. 1-66096 discloses a highly flexible synthetic resin packaging film such as a heat-shrinkable film. In the case of performing sealing packaging, the front and rear ends of the perforation expand and contract when the perforation is formed, and the packaging film escapes from the cutting edge (in-groove cutting edge) of the perforation forming blade, and the front and rear perforations. There is a problem that it is difficult to form a sufficient cut at the end. Therefore, the sealing package is torn in a direction deviating from the perforations, and the problem of impairing the appearance of the sealing package after opening is not completely solved.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to form a notch securely and sufficiently at the front and rear ends of a perforation to open the package at the perforation. An object of the present invention is to provide a perforation-forming blade capable of forming perforations that can be reliably carried out along a perforation and that can form perforations that do not impair the appearance of a package or the like after opening. Another object of the present invention is to provide a perforation forming blade capable of forming a perforation that can be opened with a small force.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a cutting tool for forming perforations having a plurality of inclined portions formed on one side of a blade body, and a cutting blade and a groove formed alternately at the tip of the inclined portion. The cutting blade is constituted by two cylindrical surfaces whose both central axes intersect on the center side of the blade main body with respect to the cutting blade. The embodiments of the present invention are as follows. A cylindrical surface constituting the cutting blade extends to the blade main body.
(A) The material of the workpiece is any of polypropylene, polyethylene, polyvinyl chloride, polystyrene, and polyethylene terephthalate. (B) The thickness of the workpiece is 0.01 to 0.25 mm. (C) The blade width of the cutting blade. Is characterized by performing a perforation of 0.6 to 1.2 mm.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a perforation forming blade according to the present invention will be described with reference to the drawings along a manufacturing procedure. As shown in FIG. 8, the material metal plate 100 of the perforation forming blade 1 has a central axis on the center of the material metal plate 100 on the front and rear surfaces so as to become thinner toward the tip as shown in FIG. On the other hand, an inclined portion 102 having the same inclination α, that is, the intersection angle of both central axes is 2α is formed, and the upper side further has １ ／ of the height of the inclined surface 102.
Is formed to form the blade projection 106. The width of the groove 104 and the width of the blade projection 106 are equal. Next, processing for forming the cutting blade 10 on the blade protrusion 106 will be described. The reason why the cutting blade 10 is formed on the blade protrusion 106 is as follows.
As shown in FIGS. 1 and 2, a process of forming the cylindrical surface 12 on the inclined surface of the blade projection 106 is performed. The cylindrical surface 12 has an inclination angle β whose central axis is larger than α with respect to the central surface of the material metal plate 100, and the front and rear cylindrical surfaces 12 form the cutting blade 10. The central axes of the front and rear cylindrical surfaces 12 intersect below the cutting edge 10, and the cutting edge 10 forms a substantially elliptical arc. The cylindrical surface 12 extends to the inclined portion 102 and forms a triangular groove 20 on the inclined surface.

As an example, in the case of a heat-shrinkable film used for packaging containers for cosmetics and seasonings, the material is generally polypropylene, polyethylene, polyvinyl chloride,
It is made of polystyrene or polyethylene terephthalate. The thickness of the material metal plate 100 is 1.0 mm, and the width of the cutting blade 10 and the groove 104 is 1.0 mm. Next, the operation of the perforation forming blade 1 having the above configuration will be described. The blade 1 having the above configuration is mounted on a perforation forming device such as a press machine (not shown). As shown in FIG. 9, in the perforation forming apparatus 200, a urethane resin plate 221 serving as a tool receiving base is placed on a base 220. A cylinder (not shown) having a vertically movable piston rod 224 is provided above the base 220, and a blade 1 mounted with bolts 223 via a blade holder 222 is attached to the tip of the piston rod 224. The blade 1 is located vertically above the urethane resin plate 221, and a long packaging film W as a workpiece is fed between the blade 1 and the urethane resin plate 221 by an appropriate length. When the packaging film W is fed for an appropriate length and stopped, a cylinder (not shown) is driven to lower the piston rod 24,
The cutting blade 10 of the blade 1 is pressed against the packaging film W. As a result, perforations corresponding to the shapes and dimensions of the cutting blades 10 and the grooves 104 are formed on the packaging film W. When a perforation is formed in the packaging film W, first, the center tip of the elliptical arc-shaped cutting blade 10 comes into contact with the packaging film W and is pressed. Due to this pressing of the plurality of cutting blades 10, the position of the packaging film W is fixed on the urethane resin plate 221. Subsequently, the cutting by the central tip of the cutting blade 10 starts. Cutting blade 1
The cutting by 0 is gradually made straight from the center, and the entire cutting blade 10 is cut to form a perforation.

[0009]

According to the cutting tool for forming perforations of the present invention,
A notch is formed reliably and sufficiently at the front and rear ends of the perforation, so that the opening of the package can be reliably performed along the perforation, and a perforation that does not impair the appearance of the package after opening can be formed. Has an effect. The present invention further has the effect of forming perforations that can be opened with a small force.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cutting tool for forming perforations according to an embodiment of the present invention.

FIG. 2 is a front view of a perforation forming blade according to the embodiment of the present invention.

FIG. 3 is a right side view of the cutting tool for forming perforations according to the embodiment of the present invention.

FIG. 4 is a plan view of a cutting tool for forming perforations according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA in FIG. 1;

FIG. 6 is a sectional view taken along line BB in FIG. 1;

FIG. 7 is a sectional view taken along line CC in FIG. 1;

FIG. 8 is a front view of the blade material before forming the blade edge of the perforation forming blade.

FIG. 9 is an explanatory diagram of a main part of the perforation forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting tool for perforation 10 Cutting blade 12 Cylindrical surface 20 Triangular groove 100 Metal plate 102 Slope 104 Groove 106 Blade projection 200 Perforation forming device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yumiko Kawada 1-5-7 Mikitei Sakaecho, Higashiosaka-shi, Osaka House Foods Co., Ltd. (56) References Real Opening Sho 55-93500 (JP, U) (58 ) Surveyed field (Int.Cl. ⁷ , DB name) B26D 3/08

Claims (3)

(57) [Claims] 1. A perforation forming blade having a plurality of inclined portions formed on one side of a blade main body, and cutting edges and grooves alternately formed at the tip of the inclined portion. A cutting tool for forming perforations, characterized in that the cutting tool is formed by two cylindrical surfaces that intersect on the center side of the cutting tool body with respect to the cutting edge. 2. The perforation forming blade according to claim 1, wherein a cylindrical surface constituting the cutting blade extends to the blade main body. 3. The material of the workpiece is any of polypropylene, polyethylene, polyvinyl chloride, polystyrene, and polyethylene terephthalate. (B) The thickness of the workpiece is 0.01 to 0.25 mm. The perforation forming blade according to claim 1, wherein a perforation process is performed in which a cutting edge has a blade width of 0.6 to 1.2 mm.