JP2000042997A - Perforation forming cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably open a package along perforations by reliably and sufficiently forming a notch on the front/rear ends of the perforations, by making an inclination of the taper surface different between the cutter body side and the cutting edge side, and forming a cutting edge side inclination larger than a cutter body side inclination. SOLUTION: An inclination α of the taper surface 13 continuing with a cutting edge 14 formed as symmetrical both side surfaces of a cutting edge 11, is formed so as to become larger than an inclination β of the cutting edge base part 12 side taper surface 17 formed on the cutter body side of the edge 11. It is better to properly select the inclination α by a blade width and an interval of the cutting edge 14, material and thickness of a workpiece and a diemsion of the cutting edge 14 and a groove inside cutting edge 15. It is better to set the inclination α of the cutting edge 14 side taper surface 13 to about 40 degrees to form perforations at the normal temperature by such an edge 11. When the inclination αis smaller than this, a sufficient notch is not formed on the front/rear ends of the perforations, and to the contrary, when the inclination α is large, an edge angle of the cutting edge 14 becomes an obtuse angle, so that the perforations are hardly formed.

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. A forming blade, wherein the perforation is reliably broken in a specific direction so that the package does not break in a direction deviating from the perforation and does not impair the appearance of the package even after being opened. The present invention relates to a perforation forming blade capable of forming an eye.

[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 the same straight line at appropriate intervals along one peripheral edge of a rectangular flat plate-shaped cutting tool main 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. 1-166096 can also be used for sealing with a resin-made packaging film such as a heat-shrinkable film, which is highly stretchable. When wrapping is performed, 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 (a cutting edge in a groove) of the perforation forming blade, and the front and rear ends of the perforation. However, it is difficult to form a sufficient notch. 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. The present invention is intended to solve the above-mentioned problem, and an object thereof is to form a notch securely and sufficiently at the front and rear ends of a perforation to surely open the package along the perforation. To be able to
An object of the present invention is to provide a perforation forming blade capable of forming 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.

[0005]

In order to solve the above-mentioned problems, a perforation forming blade according to the present invention, when forming a perforation, cuts the front and rear ends of the perforation while pulling the front and rear ends to the left and right. It was configured so that it could be formed. Specifically, a plurality of cutting blades formed on one side of the blade main body, a concave groove formed between the cutting blades, and a groove cutting blade formed in the concave groove and continuous with the cutting blade, A perforation forming blade formed on both sides of the cutting blade and having a tapered surface continuous with the cutting blade, wherein an inclination angle of the tapered surface is different between the blade main body side and the cutting blade side; Characterized in that the inclination angle on the side of the blade is greater than the inclination angle on the side of the blade body. According to this configuration, the tapered surface formed at a relatively large inclination angle on both sides of the cutting edge pulls the front and rear ends of the perforation to the left and right, and the cutting edge in the groove cuts the front and rear ends of the perforation. Notches are formed at the front and rear ends by the in-groove cutting blades to ensure opening of the package whose perforations have been broken in the front-rear direction. Therefore, the appearance of the package after opening is not impaired.

[0006] By variously changing the inclination angle of the tapered surface in accordance with the material and thickness of the workpiece, and the dimensions of the cutting blade and the in-groove cutting blade, the package can be more reliably opened. Can be obtained. In one embodiment, the material of the workpiece is any one of polypropylene, polyethylene, polyvinyl chloride, polystyrene, and polyethylene terephthalate, and the thickness of the workpiece is 0.01 to 0.25 mm, preferably 0.02 mm. And the length of the front and rear ends of the perforations formed by the cutting edge and the in-groove cutting edge is 0.6 to 0.07.
1.6 mm, and the blade width of the cutting blade is 0.6 to 1.6 mm
When the cut amount formed at the front and rear ends of the perforations by the grooved cutting edge is 0.5 mm, it is preferable that the inclination angle of the tapered surface on the cutting edge side be 40 degrees. Such a workpiece corresponds to a heat-shrinkable film generally used for packaging containers such as seasonings and cosmetics.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a perforated blade according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially enlarged perspective view of a cutting tool for forming perforations according to an embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrows XX in FIG.
Perforated blade of the present embodiment (hereinafter referred to as blade 1)
The cutting edge 11 is formed on one side peripheral portion of a rectangular flat plate-shaped cutting tool main body 10 made of a hard steel material. At the tip of the cutting edge 11, cutting edges 14, ₁ each having a predetermined blade width L1 are provided.
Are formed on the same straight line at a predetermined interval S. Are formed as V-shaped concave grooves 16 when viewed from the side, and the ridge passing through the center of each concave groove 16 is an in-groove cutting continuous with each of the cutting blades 14, 14,. Blade 15,
15... In addition, the in-groove cutting blade 15,
The ridge lines other than the ridge lines forming 15... May be formed in an arc shape so as not to form an extra cut in a perforation.

[0008] Both side surfaces of the cutting edge 11 are formed as symmetrical tapered surfaces.
4, 14... It changes at the position 12a in the vicinity. That is, the inclination angle α of the tapered surfaces 13, 13,... That are continuous with the cutting blades 14, 14,. It is formed to be larger than the inclination angle β. The inclination angle α is the cutting edge 1
4, 14,..., The blade width L ₁ , the interval S, the material and thickness of the workpiece, the cutting blades 14, 14,.
It is desirable to select appropriately according to the dimensions and the like. Depending on these conditions, the cutting edges 14, 14,...
This is because the size of the perforation is determined by the size of 5, 15,..., And the size of the cut formed at the front and rear ends of the perforation is determined.

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,
Polystyrene, polyethylene terephthalate, thickness 0.25 mm, cutting edge 14, 14 ... of the blade width L ₁ = 0.6 m
m, spacing S = 1.4 mm, inclination angle β = 10 degrees, cutting edge 14,
.., A cutting depth D = 0.7 mm, and the cutting blades 14, 14,.
15 ... equals 1mm in length of the perforation projected length L ₂ is to be formed in each depth of cut formed in the front and rear ends of the perforations by the groove inner cutting edge 15, 15 ... 0.2 mm
It is. Under these conditions, in order to form a perforation at room temperature, the tapered surfaces 13, 14 on the cutting edges 14, 14,.
It is desirable to set the inclination angle α of 13 ·· 40 degrees. If it is smaller than this, sufficient cuts will not be made at the front and rear ends of the perforations, and the package cannot be completely opened along the perforations. On the other hand, if it is larger than this, the cutting edge 14, 1
The cutting edge angle of 4 ... becomes obtuse, making it difficult to form perforations.

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 apparatus such as a press machine (not shown). FIG. 3 schematically shows a main part of the perforation forming apparatus. On a base 20 of the perforation forming apparatus, a urethane resin plate 21 which is a tool receiving base is mounted. A cylinder (not shown) having a vertically movable piston rod 24 is provided above the base 20, and the blade 1 mounted with bolts 23 via a blade holder 22 is attached to the tip of the piston rod 24. The blade 1 is located vertically above the urethane resin plate 21,
A long packaging film W, which is a workpiece, is fed between the blade 1 and the urethane resin plate 21 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,
Are pressed against the packaging film W.
As a result, perforations corresponding to the shapes and dimensions of the cutting blades 14, 14,... And the in-groove cutting blades 15, 15,. The front and rear ends of the perforation are cutting blade 1
The tapered surface 13, 13,
. Therefore, it is pulled to the left and right (in the direction perpendicular to the cutting edges 14, 14,...), And in this state, the in-groove cutting edges 15, 15,. You.

FIG. 4 shows a perforation formed by the above procedure. As shown, the front and rear ends 3 of the perforations 30
Cuts 31a and 32a are formed in the grooves 1 and 32 by the interaction between the in-groove cutting blade 15 and the tapered surface 13. The length L ₂ ′ of the perforations 30 is equal to the projected length L ₂ of the cutting edges 14, 14,... And the in-groove cutting edges 15, 15,.
The length L ₁ 'between the cuts 31a, 32a is the cutting edge 14,1.
4 equal to the blade width L ₁ of the ... The cut lengths of the cuts 31a and 32a are substantially equal to the value represented by (L ₂ −L ₁ ) / 2. Therefore, when a transverse rupture force is applied to the perforation 30, the perforation 30 easily breaks at the front and rear ends 31, 32, and the rupture proceeds in a direction along the perforation 30 without fail. The package does not break in the direction deviating from the perforation on the way.

[0012]

According to the cutting tool for forming perforations of the present invention,
At the front and rear ends of the perforations, an acute angled cut can be reliably formed by the interaction between the tapered surfaces on both sides of the cutting blade and the cutting edge in the groove, so that a perforation that reliably breaks from the front and rear ends can be obtained. As a result, when opening the sealing package or the like, the perforation is always broken in the correct direction, and a sealing package that does not impair the appearance even after opening can be obtained. In addition, since the thickness of the portion on the tip end side of the blade base that is continuous with the cutting blade increases, chipping or wear of the cutting blade hardly occurs, and the life of the perforation forming blade can be extended. According to the present invention, there is an effect that a perforation that can be opened with a small force can be formed.

[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 view in the direction of arrows XX in FIG. 1;

FIG. 3 is a schematic view of a main part of a perforation forming apparatus equipped with a perforation forming blade of this embodiment.

FIG. 4 is a plan view of a perforation formed using the perforation forming blade of this embodiment.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 perforation forming blade 10 blade main body 11 blade tip 12 blade base 13, 17 tapered surface 14 cutting blade 15 in-groove cutting blade 16 concave groove 20 base 21 urethane resin plate 22 blade holder 23 bolt 24 piston rod 30 perforation 31 perforation Front end of eye 32 Rear end of perforation 31a, 32a Cut W Wrapping film (workpiece) α, β Inclined angle of tapered surface L ₁ Blade width of cutting edge L ₂ Cutting edge at predetermined cutting of cutting edge and in-groove cutting edge Projection length S Groove width

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Atsuhiro Otsuka 1-5-7 Mikitei Sakaecho, Higashiosaka-shi, Osaka House Foods Co., Ltd. No. 7 House Foods Co., Ltd. F-term (reference) 3C060 AA04 AA20 BA03 BA08 BB19

Claims (2)

[Claims] 1. A plurality of cutting blades formed linearly on one side of a blade main body, a concave groove formed between the cutting blades, and an inner groove formed in the concave groove and continuous with the cutting blade. A blade and a perforation forming blade having tapered surfaces formed on both sides of the cutting blade and continuous with the cutting blade, wherein an inclination angle of the tapered surface is different between the blade main body side and the cutting blade side; The blade for forming perforations, wherein the angle of inclination on the side of the cutting blade is larger than the angle of inclination on the side of the blade main body. 2. The inclination angle of the tapered surface on the cutting edge side is set to 3
(A) the material of the workpiece is any of polypropylene, polyethylene, polyvinyl chloride, polystyrene, or polyethylene terephthalate; (b) the thickness of the workpiece is 0.01 to 0.25 mm; C) The length of the front and rear ends of the perforations formed by the cutting edge and the in-groove cutting edge is 0.6 to 1.6 mm, and (d) the blade width of the cutting edge is 0.
2. A perforation forming method according to claim 1, wherein the cut widths formed at the front and rear ends of the perforation by the cutting edge in the groove are each 0.5 mm or less. Cutlery.