JP2812250B2 - Method for manufacturing paper saw blade by two-stage punching method and method for manufacturing and bonding paper saw blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention contains a packaging film (hereinafter referred to as a "wrap film") for packing food, etc., an aluminum foil or a cooking sheet, and cuts it into a desired length as required. The present invention relates to an improvement of a cutter (saw blade) mounted or formed in a storage box (also referred to as a carton) which is taken out, and particularly to a method of manufacturing the cutter and a method of bonding with a paper saw blade.

[0002] The paper saw blade to which the present invention is directed is a "resin-cured paper blade" obtained by applying or impregnating a curable resin onto a paperboard material and curing the same, and a sawtooth- shaped material using a vulcanized fiber as a material. And a so-called “VF blade” , which is a punched edge . It contains a modified resin or an ultraviolet curable resin.

[0003]

2. Description of the Related Art A wrap film, an aluminum foil, a cooking sheet (hereinafter referred to as a wrap film) supplied in the form of a roll is provided with a saw blade attached to an edge of a front plate, a bottom plate or a lid plate of a box. The wrapped film or the like is stored in a storage box such as a wrapped film or the like, and when necessary, the wrapped film or the like is pulled out by an arbitrary length and cut through a saw blade attached to an end of the box to obtain a desired one. Is used as the length. Saw blade for cutting the wrap film or the like, conventionally, it is often made of metal, metal saw blade handling, easy to damage the fingers, always involves that risk, also when it incinerated upon disposal, saws There was a problem that the blades were left unburned and had to be removed from the carton for processing.

Recently, paper saws have been proposed in place of the metal saw blades , and some of them have already been put to practical use. Conventional paper saw blades can be broadly divided into so-called "resin-cured paper blades", which are made of paperboard as a raw material and coated or impregnated with a curable resin and cured. after integrally laminated to a constant layer thickness by utilizing the Nikawaka action, as a material of vulcanized fiber obtained by drying molded to extract and remove zinc chloride, was saw blade punched it into serrated so-called " VF blade ". These two paper saw blades are excellent both in terms of safety and disposal.

[0005] However, it cannot be denied that the above-mentioned paper saw blade is inferior in sharpness as compared with a metal blade. Therefore, when pulling out the wrap film, aluminum foil or cooking sheet from its storage box and cutting it, regardless of the case of aluminum foil or cooking sheet, the wrap film made of polyethylene or polyvinyl chloride having relatively large film elongation is used. The problem of poor sharpness has been pointed out.

As shown in FIG. 6, a film storage box 20 is provided.
It is considered that the cutting action on the film F drawn out of the box by the saw blade (including both the paper saw blade and the metal blade) mounted or formed on the box is performed as shown in FIG. (FIG. 7-A) After the film F has been pulled out in the direction of the required length a, the film is displaced downward (direction B) and is brought into contact with the tip 23 of the blade 22 of the saw blade 21. When the film is pulled in the a and b directions in this state, the film is caught on the tip (tip) 23 of the saw blade. At this time, it is necessary that the film does not slip on the blade. (FIG. 7-B) Then, when the film F is further pulled in the a and b directions, the tip portion 23 of the saw blade pierces the film, and small holes are opened in a line. (FIG. 7-C) When the film is further pulled in the a and b directions, the hole is enlarged in the width direction of the film by the oblique side of the saw blade. (FIG. 7-D) The enlarged hole finally becomes one continuous tear, and the film is cut. In order for such a cutting action to be performed smoothly, that is, to make the saw blade 21 sharp, the tip portion 23 of the saw blade is required.
It must be sharp (sharp), hard, not to break even after many uses, and not to wear.

In the conventional paper saw blade, a raw material made of paperboard or vulcanized fiber is formed into a cutting edge shape as shown in FIG.
To make paper saw blades . In this saw blade forming machine, a paper saw blade 21 as a product was punched by a die set in a shearing method. This punching method is a method referred to as a so-called “guillotine method”, and can be considered to be almost the same as the method for manufacturing a metal saw blade. That is, as shown in FIG. 9, between the fixed upper blade 31 and the vertically moving lower blade 32 in the die set, the raw fabric 30 is supplied so as to protrude from the upper surface of the lower blade 32, and the protruded raw fabric is supplied. punched saw blade portion in a single reciprocating movement of the lower blade. For this purpose, the paper saw blade 21 has been manufactured by applying a sharp shearing force to the material.

[0008]

[SUMMARY OF THE INVENTION However, in the method for producing paper saw blade according to the shear stamping, after the raw is in contact with the lower blade, raw is torn off. In other words, the web is hit
When it is pulled out , a phenomenon is observed in which the constituent fibers of the raw fabric are partially peeled. That is, the shear cut surface of the paper saw blade as a product is in a state where the material fibers are peeled off, or the fibers are crushed, lacks sharpness as compared with that of the metal saw blade, and the tip 23 of the saw blade is rounded. A tendency was observed (see FIGS. 10B and 11). The reason is that the blank punched into the clearance (gap) between the upper blade and the lower blade is drawn. However, it is difficult to set the clearance between the upper blade and the lower blade, and it is difficult to fix the raw material at the same time as the punching operation so that the raw material is not drawn in. Therefore, in the conventional shear punching method, the lower blade must be reciprocated with the raw fabric firmly fixed,
It is considered that the raw material punched into the clearance (gap) between the upper blade and the lower blade is pulled in, and as a result, the constituent fibers of the raw material are partially removed. In addition, resin-cured paperboard and vulcanized fiber are softer and more tough than steel, so that a sharp saw blade cannot be formed unless the clearance between the upper blade and the lower blade is set to extremely severe.
Therefore, it is demanded that the shearing cut surface of the paper saw blade be hard and sharp at the tip of the saw blade like that of a metal blade.

The present invention has been made in order to satisfy such a demand, and an object of the present invention is to provide a method capable of forming the tip of a paper saw blade sharply, that is , a method for sharpening the tip of a paper saw blade.
For making paper saw blades with a sharp saw-tooth
An object of the present invention is to propose a method of superposing a paper saw blade at a predetermined position and performing ultrasonic bonding .

[0010]

In order to achieve the above object, the present inventor has proposed that a saw blade to be manufactured be provided with a valley or a hypotenuse.
A knife blade having a corresponding part dropped, and the knife blade
With a pedestal that presses the cutting edge of the blade vertically
While supporting the paper saw blade material on the receiving table
Cut the blank with the edge of the knife blade,
The part that will be the cutting edge of the saw blade, with the joint remaining on the hypotenuse
Only after cutting sharply, the upper blade and lower blade for joint cutting
Two-stage punching characterized by cutting the joint with
The present invention proposes a method of manufacturing a paper saw blade by the method .

Further, the present inventor has provided a heat-soluble coating on the surface.
Using the raw material for the saw blade, the valleys or
Is a knife blade with the blade at the point corresponding to the hypotenuse,
The pedestal against which the blade edge of the knife blade is pressed vertically
With the cutting means provided, the raw paper saw blade is supported on the receiving table.
While cutting the raw material with the edge of a knife blade,
With the joint remaining at the valley or slope,
After sharply cutting only the part that becomes
Pitch feed, then connect the upper and lower blades
At the same time as cutting the tie,
Lay the paper saw blade with the cut part through the heat-soluble film.
A method of bonding paper saw blades by ultrasonic bonding
Is what you do .

It is to be noted that the blade edge referred to in this specification is “spilled”.
Or "damaging" the cutting edge means dropping the blade
You. The connecting part is the part where the knife blade was dropped.
Formed from minutes. The joint portion is formed at a valley portion or a hypotenuse portion of the saw blade except for the tip portion (tip) of the saw blade.

In the present invention, leaving the portion of the tether, after press-cutting by the knife blade the original fabric for Kaminoko blade,
Since the joint portion is finally cut and separated by the fixed lower blade and the vertically moving upper blade to produce a paper saw blade as a product, at least two times of the push-off operation and the final cutting (separation) operation. Ru der shall require the punching operation.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1, 2 and 3 are schematic views schematically showing the present invention. In the drawing, reference numeral 1 denotes a sheet-shaped material for forming a paper saw blade (raw material), which has a thickness of 0.3 as an example.
It is formed from resin-cured paperboard or vulcanized fiber of 5 to 0.25 mm or a moisture-proof processed product thereof. Reference numeral 2 denotes a nip roll, which is a driving means for feeding the paper saw blade material 1 to the die section at a constant pitch. The reference numeral 3 is a knife blade for press-cutting in the Daiyatto portion, with is constructed vertically movable, vertically against the receiving surface of the lower pedestal 4 fixed
And a supporting means 5 for elastically pressing against and pressing against . A groove for protecting the cutting edge and a flexible material (not shown) may be attached to the lower receiving base 4 facing the knife blade. The lower support 4 is connected to the
Also serves as the lower blade

In FIG. 1 to FIG. 3, reference numeral 6 denotes a vertically movable joint cutting upper blade provided at a position adjacent to the front of the knife blade 3 (downstream side). This upper blade is in front
As described above, it also corresponds to the cradle 4 also serving as the lower blade. The material 1 is placed between the upper blade 6 and the fixed cradle / lower blade 4.
Is configured to be fed at a constant pitch so as to protrude from the edge of the lower blade, so that the material supported in a cantilever shape can be cut from the edge of the lower blade 4 by one reciprocating motion of the upper blade 6. It has become.

In FIG. 1, reference numeral 7 denotes a paper saw blade as a product. This paper saw blade 7 is, for example, 30 cm ×
It is cut to a size of 0.8 cm, and is attached to a predetermined position of a carton blank 8 which is a box material for accommodating the roll film by a suitable means. In this case, if a heat-soluble coating such as PP is provided on the surface of the material 1 of the saw blade, the paper by the upper blade is passed through an ultrasonic welding device (horn) 9 provided at a position corresponding to the lower side of the upper blade 6. Subsequent to the separating and cutting operation of the saw blade, the welding operation to the carton blank can be performed consistently and continuously.

FIGS. 4A and 4B are schematic sectional views of the knife blade 3. As you can see from the figure, this knife blade
Scratching a specific position on the blade, the valley or hypotenuse of the saw blade
A portion 10 is formed by dropping the blade at a location corresponding to . The paper saw blade material 1 is sequentially supplied at a constant pitch via a driving means 2 between a knife blade and a fixed pedestal in a die set portion, and a part of the material 1 is cut by a knife blade 3 having a spilled edge. Most of the structure is configured to be pushed out except for the (connecting portion 11 ).

FIG. 5 is an enlarged plan view showing a state in which the material 1 for a paper saw blade is pushed off while leaving a connecting portion in a part of the material, and reference numeral 11 indicates the connecting portion. The connecting portion 11 is a portion 10 where the knife blade 3 is spilled.
Formed. The connecting portion 11 is formed on the hypotenuse 7b or the valley of the saw blade except for the tip 7a (top) of the paper saw blade as a product.

As described above, the present invention provides a paper saw blade material (original).
Anti) punching, the valley or hypotenuse of the saw blade to be manufactured
A knife blade whose blade has been dropped at a point corresponding to
Cutting table with a pedestal that presses the blade tip
A cutting means is used, by which the paper saw blade material
While supporting the (raw sheet) on the cradle, the knife blade on the raw sheet
Cut the tip, leaving a tether at the valley or hypotenuse of the saw blade.
Cut only the sharp edge of the saw blade
It is a method that Therefore, according to the method of the present invention, the shear cut surface of the paper saw blade as the product is the conventional one (FIG. 10).
(See (A) and (B)), and the tip 7a of the saw blade is particularly sharp.

FIG. 12A shows a conventional product paper saw blade (V).
It is a photograph (reference photograph) which showed the shearing cut surface of the blade edge of (F blade). FIG. 12B is a photograph (reference photograph) showing a shear cut surface of a blade edge of a paper saw blade (VF blade) corresponding to the present invention. In each case, the photographing was performed 8 times with a microscope.

The present invention also provides a heat-soluble coating on the surface.
Using a raw paper saw blade for the saw blade to be manufactured
A knife blade with a blade corresponding to the hypotenuse dropped
A pedestal for pressing the blade edge of the knife blade vertically
With the cutting means obtained, do not support the paper saw blade
Cut the raw material with the edge of a knife blade,
Only the part that will be the cutting edge of the saw blade
After cutting sharply, the raw material is fed at a fixed pitch,
Next, cut the joint part with the joint cutting upper blade and the blade.
At the same time, the joints were cut in place in the carton
Lay the paper saw blade and ultrasonically bond through the heat-soluble coating.
Things.

As described above, the ultrasonic welding device (horn) 9 is provided at a position corresponding to the lower side of the upper blade 6, and the joining cut is performed.
Following the separation and cutting operation of the paper saw blade by the upper blade and the lower blade , the operation is continuously and consistently performed until the welding operation to the carton blank.

[0023]

As described above, according to the present invention, after the material for the paper saw blade is pushed off by the knife blade while leaving the joint portion, the joint portion is finally formed by the fixed lower blade and the vertically moving upper blade. Since the paper saw blade as a product is manufactured by cutting and separating the paper saw blade, the shear cut surface of the paper saw blade as a product is smoother than that of the conventional one, and the tip of the paper saw blade is formed sharply. (See FIG. 12B).

Further, since the connecting portion is merely cut by the fixed lower blade and the upper blade that moves up and down, the clearance between the upper blade and the lower blade does not need to be set strictly, and the shearing force is lower than in the past. Not only does it need to be bigger ,
Following the cutting operation of the paper saw blade by the upper blade and lower blade for cutting
Te, continuous consistently until the welding operation to the carton blank
And has excellent effects such as a reduction in processing time .

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram schematically showing the production method of the present invention,
This figure shows a state in which the material for a paper saw blade has been pushed off while leaving a connection portion in a part of the material.

FIG. 2 is a schematic diagram showing a state in which a joint is sheared by a fixed lower blade and an upper blade that moves up and down.

FIG. 3 is a diagram showing a state in which a joint portion is similarly cut between a fixed lower blade and an upper blade that moves up and down by a shearing method, and a paper saw blade cut into a carton blank is bonded. FIG.

FIGS. 4A and 4B are schematic cross-sectional views of the knife blade 3. FIG.

FIG. 5 is an enlarged plan view showing a state in which the material for a paper saw blade is cut off while leaving a joint portion in a part of the material.

FIG. 6 is a perspective view of a wrapping film storage box supplied in a rolled state.

FIG. 7 is an explanatory view schematically showing a cutting action of a film by a cutter.

FIG. 8 is a skeleton sectional view showing an example of a conventional saw blade forming machine.

FIG. 9 is a perspective view showing a fixed upper blade and a movable lower blade according to the first embodiment;

FIG. 10A is a plan view of a conventional product paper saw blade. FIG. 3B is an enlarged perspective view of a part of the shear cut surface of the paper saw blade.

FIG. 11 is a plan view of FIG.

FIG. 12 (A) is a reference micrograph showing a shear cut surface of a conventional VF blade. FIG. 12 (B) is a reference micrograph showing a shear cut surface of a VF blade equivalent to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Material for paper saw blade 2 Nip roll 3 Knife blade 4 Lower pedestal and lower blade 5 Support means 6 Upper blade 7 Paper saw blade 8 Carton blank 9 Ultrasonic welding device 10 Knife blade spilled part 11 Joint part

Continuation of front page (56) References JP-A-6-71785 (JP, A) JP-A-5-111969 (JP, A) JP-A-5-229552 (JP, A) JP-A-5-92399 (JP) , A) JP-A-6-48428 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B31B 1/00-49/00

Claims (1)

(57) [Claims] 1. A knife blade in which a blade corresponding to a valley or a hypotenuse of a saw blade to be manufactured has been dropped by using a paper saw blade raw material having a heat-soluble coating on the surface, and the knife blade. Cutting means provided with a pedestal for pressing the cutting edge of the blade from the vertical direction
Wherein the cradle also serves as a lower blade for joint cutting.
While supporting the paper saw blade material on the receiving table by the cutting means, the raw material is cut by the blade edge of the knife blade, and the blade of the saw blade is After sharply cutting only the portion that becomes the above, the raw material is fed at a fixed pitch, and then, at the same time as cutting the joint portion with the upper blade and lower blade for joint cutting, the joint portion is cut at a predetermined position of the carton. A method for manufacturing and bonding a paper saw blade, comprising: stacking a plurality of paper saw blades, and performing ultrasonic bonding via the heat-soluble coating.