JPH06182906A - Bonding method for saw teeth made of vulcanized fiber at high speed - Google Patents

Abstract

PURPOSE:To enable saw teeth to be bonded to a carton blank quickly by a method wherein both are welded after preliminarily heating a bonding part of the carton blank when they are ultrasonic welded via a thermoplastic resin film molded to a sheet with saw teeth made of vulcanized fiber. CONSTITUTION:A raw fiber sheet 3 of a vulcanized fiber board wherein a dampproof film composed of a thermoplastic layer is formed on both sides of the raw fabric of the vulcanized fiber, is fed so as to project on an upper surface of a lower edge 37 by a specific length from an end face of an upper edge 34. A die setting mechanism is transferred to an operation of mold clamping under such a state, and the lower edge 37 is raised to cut the raw fabric sheet 3 off in a saw teeth form. At the same time, the sheet with saw teeth after cutting off is pushed at a specific position on a surface to be bonded of the carton blank P being on standby above the sheet. Prior to pushing, for example, hot air is blown agaisnt the carton blank P just before ultrasonic welding via a blowing nozzle 50 to carry out preliminary heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cooking sheet such as a wrap film or aluminum foil wound in a roll and stored in a carton, and a necessary amount of the sheet is pulled out and cut by a cutting blade (serrated blade) attached to the carton. The present invention relates to a carton with a cutting blade, and particularly to a method for adhering the cutting blade to the carton at a high speed.

[0002]

2. Description of the Related Art As is well known, a cooking sheet such as a wrap film and an aluminum foil is wound into a roll and then a carton case (hereinafter referred to simply as a bottom plate, a front plate, a back plate, a gable plate and a lid). It is stored in a carton), and when necessary, the sheet is pulled out from the winding roll by an arbitrary length, and then the saw blade is attached to the carton in advance (hereinafter simply referred to as a cutting blade or a saw blade). Cut and use. As a cutting blade of the carton, a metal plate-shaped cutting blade is generally used, and a protrusion for caulking is provided in advance on this cutting blade, and it is easily attached by stacking pressure on a predetermined mounting position of the carton blank. I was able to. However, the metal cutting blade may damage the fingers when handling the carton, and since the cutting blade portion cannot be incinerated when the carton is discarded, it has to be removed from the carton, which is a problem for disposal. Therefore, recently, there has been proposed a carton having a paper or resin cutting blade that can be incinerated instead of the metal cutting blade and does not generate dust pollution. Since this paper cutting edge does not have a crimping function unlike a metal cutting edge, it is usually fixed with an adhesive or heat-sealed. Also, a method of adhering the vulcanized fiber cutting blade and the carton by welding the thermoplastic resin film interposed between the cutting edges using ultrasonic waves has been proposed (Patent dated October 30, 1992). Wish P
2403).

[0003]

By the way, in the bonding method using the adhesive, the adhesive is expensive and a step of applying the adhesive to the carton or the cutting blade is required.
Further, when the cutting blades are bonded, punching and bonding of the blades are performed mechanically at the same time, so that there is a problem that adhesive residue adheres to the cutting blades. In the case of heat sealing, heat is transferred to the cutting edge of the cutting blade die and expands,
There was also a problem that the engagement was bad and the cutting edge was damaged. Further, although the above problems can be avoided in the welding and adhesion by ultrasonic waves, it is not possible to raise the productivity to the same extent as when mounting a metal cutting blade, and it is necessary to shorten the time for ultrasonic sealing. The present invention has been made to eliminate the above-mentioned problems of the conventional type, and the purpose thereof is to:
It is an object of the present invention to provide a novel means for adhering a vulcanized fiber saw blade to a carton blank quickly and reliably.

[0004]

In order to achieve the above object, the present invention provides a vulcanized fiber in which a thermoplastic resin film is applied at a predetermined position of a carton composed of a bottom plate, a front plate, a back plate, a gable plate and a lid. When the manufactured saw blades are welded, the bonding interface is preheated with hot air or the like and then ultrasonically welded to each other. The synthetic resin film may be any film as long as it is a film of a thermoplastic resin, but polypropylene (P
P), polyethylene (PE) having a low melting point, ethylene vinyl acetate copolymer resin (EVA), PET or the like is most suitable.

That is, the present invention provides a vulcanized fiber on both sides, for example, a polyolefin resin film,
A material with a moisture-proof coating with low moisture permeability selected from either polyester resin film or polyvinylidene chloride resin film is used as a material, and a saw blade is formed on this material to form a sheet with a saw blade. The sheet with a saw blade is adhered to the carton described above, and the adhesion is performed as follows. First, after preheating by blowing hot air or the like to the bonding portion of the paperboard constituting the carton described above, a sheet with a saw blade is formed on the surface of the sheet by a ultrasonic welding method through a moisture-proof coating. To weld them to each other so that the saw blade can be attached to the carton quickly and firmly.

The moisture-proof coating may be formed directly on the surface of the vulcanized fiber, but prior to that, the melamine resin, glyoxal, or other water-proofing agent may be applied to the water-proof or water-proofing means. Of course, the moisture-proof film may be formed after the waterproof treatment is applied.

By the way, in order to improve the adhesion between the moisture-proof coating and the vulcanized fiber, the following means can be adopted. That is, a method of applying an anchor coating agent such as polyethyleneimine to the vulcanized fiber surface in advance, or prior to laminating a moisture-proof coating on the vulcanized fiber surface, a corona discharge treatment is previously performed on the surface of the resin film to be the moisture-proof coating. There are ways to go.

Furthermore, it is also possible to subject the end faces of the saw blade after forming the saw blade as described above, more specifically, to the recesses of the individual cutting blades, in order to make them water resistant. The following processing is performed on the periphery of the blade after forming the sawtooth blade. That is, one of them is a method of applying or impregnating an organic solvent solution of each of the resins having relatively high fluidity or various waterproofing agents other than the above, and subjecting the end face of the blade to waterproofing, In addition to the above, the electron beam curable resin (EB resin) or the ultraviolet curable resin (U
A waterproof film may be formed by coating an ionizing radiation curable resin such as V resin) and then curing the resin. The waterproof film after curing with ionizing radiation curable resin is
Since it has extremely high hardness, it has the effect of preventing water from penetrating from the end surface of the saw blade and improving the strength of the blade itself. Incidentally, the water resistant treatment is a concept including a so-called waterproof treatment for preventing infiltration of moisture.

The moisture-proof coating may be formed on both the front and back surfaces of the vulcanized fiber, and then the waterproof coating may be formed on the end surfaces of the saw blade in the second step. Alternatively, the vulcanized fiber material may be preliminarily impregnated with a waterproofing agent, and a sawtooth blade may be formed after forming a moisture-proof coating on both surfaces thereof.

Thus, according to the present invention, it becomes possible to keep the vulcanized fiber saw toothed sheet in a state in which it is hardly affected by humidity. Therefore, even though the vulcanized fiber is used as a material, the sheet with saw tooth blades having extremely high dimensional stability is provided. Since it becomes a sheet, the cutting performance of the saw blade is also high, and even when this sheet is bonded to the carton, there is no risk of peeling at the bonding site,
Moreover, it is possible to provide a strongly bonded carton with cutting teeth.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The main material of the sheet with a saw blade used in the present invention is vulcanized fiber, and as is well known, a cotton fiber or chemical pulp is used as a raw material, and a base paper produced without size has a predetermined concentration (generally, Baume degree 6
5-74) treated with zinc chloride liquid, which has properties intermediate between wood and metal, has high elasticity and rigidity, is far lighter than metal, and is suitable for various oils. Has a high degree of tolerance.

The present invention utilizes the above-mentioned properties of the vulcanized fiber, and by subjecting this to the special processing as described below, the above-mentioned sheet with a saw blade is obtained, and this sheet is adhered to a carton. It is intended to provide a carton with a cutting blade that is highly useful as an alternative to the metal blade of. The thickness of the sheet with a saw blade is about 0.2 to 0.5 mm, preferably 0.25.
About 0.35 mm, the thinner the better the sharpness.

In the present invention, the above-mentioned raw material of vulcanized fiber may be used as it is as a raw material for a sheet with a saw blade, but this vulcanized fiber is previously coated with a melamine resin solution or a glyoxal solution. Alternatively, it may be impregnated with water resistance to be used.

The method for forming the moisture-proof film provided on the surface of the raw fabric will be described in detail. Various low-moisture-permeability resins selected from the above-mentioned polyolefin resins, polyester resins, polyvinylidene chloride resins, etc. are used in the form of emulsions or solutions. With the method of coating on the surface of the raw sheet, or a method of dry laminating in the form of a film, further, by holding each of the resins in a molten state, by extrusion coating on the surface of the raw sheet Can be adopted.

Among them, a method of laminating a polyolefin resin having a low moisture permeability such as polyethylene, polypropylene or methylpentene polymer on the surface of the vulcanized fiber by melt extrusion is preferable.

When a sheet with a saw blade having the above structure is adhered to a carton blank, an emulsion such as a polyethylene resin is applied in advance as an adhesion promoter to the carton side at a position corresponding to the adhesion site to form a film. If formed, the bonding strength between the two will be further increased.

The method for producing the vulcanized fiber stock used in the present invention will be briefly described below. 50% NBKP and 50% NDSP as pulp
Using the paper materials blended one by one, paper making of 105 g / m ^{2 of} base paper is performed. After dipping the two base papers in a zinc chloride solution at 69 ° Baume and 40 ° C., squeezing, heating and pressure bonding, and aging in air into a zinc chloride solution tank at about 30 ° Baume, successively, low concentration zinc chloride Aging is performed in a solution tank to elute zinc chloride. Then, after pickling in a hydrochloric acid tank, it is sent to a water washing tank to remove zinc chloride. After that, preliminary drying is performed, and then a melamine formalin resin solution is applied to both sides (10 g / m ² in terms of solid content and dried with a cylinder dryer.
A vulcanized fiber stock having a water resistance of 25 mm is obtained.

[0018] Polyethyleneimine was applied to both the front and back sides of the raw fabric at a solid content of 3 g / m ² to perform anchor treatment by drying, and then the treated surface was subjected to melt extrusion coating of low density polyethylene. Then, a moisture-proof coating composed of a low-density polyethylene layer having a thickness of 20 μm was formed on both sides.

Thus, as shown in FIGS. 1 and 2, a vulcanized fiber plate 3 having a moisture-proof coating 2 composed of the polyethylene layer formed on both front and back surfaces of a vulcanized fiber material 1 is obtained. The sheet 4 with saw blades made of vulcanized fiber as shown in the figure can be easily obtained by hanging it over or punching it with a press machine or the like.

According to the present invention, after the moisture-proof coating 2 is formed on both sides of the raw fabric 1 under the above-mentioned intention, a sheet with a saw blade having a form as shown in FIG. 1, that is, a saw tooth having an elongated rectangular shape as a whole. A bladed sheet 4 is obtained, and as an example,
A 8 × 30 cm flat plate-shaped sheet with a saw blade having a thickness of about 0.25 mm was obtained. Reference numeral 4a represents a saw blade.

On one side of the moisture-proof coating 2 in the sawtooth blade-shaped sheet 4 of the above-mentioned form, corona discharge treatment is applied to activate the coating surface to make it an easy-adhesion surface having a surface tension of 40 dyne / cm, and then the sheet. Is adhered to a predetermined position of the developed carton blank shown in FIG.

The construction of the carton will be described below with reference to FIGS. In the figure, reference sign P indicates a rice basis weight of 35.
0 g / m ² paperboard carton blank (0.8 mm
Thickness 11) is a rectangular bottom plate formed by partitioning the blank through folding lines, and the front plate 12 is connected to the long side below the bottom plate in the figure, and the other long side A rear plate 13, a top plate 14, and a cover plate 15 are sequentially provided so as to be adjacent to each other through a folding line similar to the above.
Adhesive pieces 16 and 17 are extended on both sides of the front plate 12 and the rear plate 13 through folding lines, and the flaps 18 are also similarly formed on the short side of the bottom plate 11.
The gable plates 19 attached with are extended respectively.

It should be noted that the cover plate 15 is provided with a C-shaped breaking line 20 and a linear breaking line 21 continuous with the breaking line 20 as shown in the figure, and these breaking lines are opened when the carton after assembly is opened. Use to open. After assembling, a part of the lid plate 15, that is, a part of the temporary attachment piece 23 surrounded by the breaking line is opened by separating it from the carton body, and at the same time, a difference formed between the V-shaped breaking lines 20 is opened. After opening the insert piece 22, the insert piece 22 is inserted into the engaging slit 24 formed in the front plate 12 to fix the lid.

The above-mentioned sheet 4 with saw blades is for adhering this to the boundary between the bottom plate 11 and the front plate 12, and when adhering, the saw blade 4a of the sheet is slightly separated from the fold line of the boundary. It is glued and fixed in a protruding position. In addition, in adhering the above-mentioned sheet with a saw blade to a carton, the sheet has a bottom plate 11 in the longitudinal direction.
It is recommended to install it so that it is slightly shorter than the long side of.

In assembling the developed carton blank, as shown in FIG. 4, the front plate 12, the back plate 13, and the end plate 19 are vertically raised with the bottom plate 11 as the center through fold lines. After the adhesive pieces 16 and 17 are positioned inside the end plate 19 and adhered, the above-mentioned cooking sheet wound in a roll shape (see reference numeral G in FIG. 5) is accommodated therein. Then, after covering the opening surface with the top plate 14 and the lid plate 15, the lid plate is closed by spot-bonding H to the front plate 12 via the temporary attachment pieces 23 and the like.

When taking out the cooking sheet F stored in the carton, as shown in FIG. 5, the temporary tacking piece 23 which is spot-bonded is cut through the breaking line and opened, and then the roll G is formed. The edge portion of the wrapped wrapping film or sheet F is picked to draw out a desired length. The drawn film or the like is hung from the upper edge of the front plate 12 along the plate 12, and further pressed in the direction of the front plate 12, thereby
The sawtooth blade 4a protruding to the lower end edge of the blade is cut to a required length. After cutting, insert the above-mentioned insertion piece 22 into the front plate 12
It is operated so as to be inserted into the locking slit 24 formed in the above and to close the opening to prevent dust from entering the carton.

The shape of the sheet with a saw blade used in the present invention is not limited to the above-mentioned straight-edge type, and a sheet with a saw blade having a mountain shape may be used. It will be explained based on. As shown by reference numeral 5 in the same figure, when the array of saw blades is seen in a plan view, the saw blades are made of flat plate members in a distribution state in which a central portion in the longitudinal direction protrudes and is slightly inclined toward the end portion. It is also possible to use the attached sheet 5, which can be adhered to a carton blank P ′ having a developed shape similar to that described above.

The structure of this carton blank will be briefly described below. A lid plate 25 is continuously provided on the upper side of the top plate 14 of the blank. The sheet 5 with the saw blade of the above-mentioned form is attached to the lid plate surface. And the breaking line 26 having a shape conforming to the shape is engraved on the lid plate. Then, in taking out the roll-shaped film or sheet stored in the carton, through the breaking line 26,
The separating piece 27 located on the outside is removed along the breaking line to open the carton. When the separating piece 27 is separated from the lid plate 25, the portion of the saw tooth blade 4a in the sheet 5 with the saw blade is exposed from the edge of the lid plate. Alternatively, it becomes possible to cut the sheet into a required length. By the way, among the reference numerals shown in the carton blank P ′, the same reference numerals are given to the members common to the members shown in FIG.

An example of the apparatus used for carrying out the method will be specifically described below with reference to FIGS. In FIG. 7, reference numeral 30 indicates an ultrasonic welding device, which is incorporated in the upper bolster 31 of a known die set mechanism as an example. The ultrasonic welding device is composed of an ultrasonic oscillator 30a, an ultrasonic oscillator 30b, and a horn 30c, and after electrical vibration from the oscillator 30a is mechanically converted into vibration via the oscillator 30b. After the vibration is amplified by the horn 30c, it is transmitted to the moisture-proof coating on the saw blade sheet as described later to heat and melt the coating. The sheet 3 immediately after the saw blade 4a is formed in this manner is welded to the carton blank P or P ', but in the present invention, the adhesion site is preheated prior to the welding. And

Reference numeral 32 is an upper plate in the die set mechanism, and a mounting plate 35 for mounting the upper blade 34 is provided on the lower surface thereof with a slight gap 33. The upper blade 34 is fixed to the lower surface of the mounting plate 35, and a sheet clamper 36 is provided on the lower surface side of the upper blade 34 so as to maintain a certain gap. A lower blade 37 corresponding to the upper blade 34 is provided below the side surface of the sheet clamper 36 so as to face each other (see FIG. 10). Incidentally, reference numeral 38 is a lower blade mounting base, and 39
Is a lower plate, and 40 is a lower bolster, and these are all united to move up and down by a cam mechanism or cylinder mechanism (not shown).

Reference numeral 41 designates a stay bolt which is planted on the lower surface side of the mounting plate 35 and penetrates the upper blade 34 and the sheet clamper 36, and the seat portion is provided on the protruding portion of the bolt. The spring 42 is contracted so that the lower side of the clamper is always pushed up. Further, when the lower bolster 40 in the die set mechanism is raised, the stay bolt 41 is submerged so that a relief 41a for the bolt is formed on the upper surface of the lower plate 39. Furthermore, on the side of the stay bolt 41,
When the die set mechanism is opened, the sheet clamper 36 is pulled down within a certain range against the elastic force of the spring 42 to form a small clearance between the clamper 36 and the upper blade 34. A guide rod 43 is provided. That is, at the upper end of the rod 43, as shown by the dotted line in FIG. 11, the bolt head 4 that is locked to the upper surface of the sheet clamper 36.
3a is attached, and the head 43a pulls down the clamper 36 to feed the raw sheet 3 for forming the saw blade between the clamper and the upper blade 34. By the way, since the guide rod 43 moves up and down as the die set is opened and closed, the through hole 43b for the bolt head 43a to freely pass therethrough is correspondingly formed.
Are pierced through all of the upper blade 34, the mounting plate 35, and the upper plate 32.

Then, a carton blank P is supplied to the lower surface side of the upper plate 32 at a position facing the ultrasonic welding horn 30c, and on the other hand, as shown in FIG. A belt conveyor 44 for feeding the blank and a pressing roller 45 mounted on the upper surface thereof.
And the sheet 3 before the formation of the sawtooth blade described above.
Is configured to be supplied to the die set mechanism via the illustrated nip roll 46. The meshing relationship between the upper blade 34 and the lower blade 37 is as shown in FIG. 10, and serrated edges that engage with each other are formed as die blades on both end surfaces. Further, in the supply path of the carton blank P, a hot air blowing nozzle 50 is arranged below the upper plate 32, and the carton blank immediately before ultrasonic welding is preheated via this nozzle. .

Then, as shown in FIG. 8, when the die set mechanism is in the mold open state, the carton is directly below the welding horn 30c on the lower surface side of the upper plate through the belt conveyor 44 and the pressing roll 45 as shown by an arrow. The blank P is fed, while the raw sheet 3 for forming the saw blade is fed between the upper blade 34 and the sheet clamper 36. That is, when in the mold opening state described above,
The bolt head 43a forming the guide rod 43 is shown in FIG.
Since the sheet clamper 36 is pushed down as shown in FIG. 3, a constant gap is formed between the clamper 36 and the upper blade 34. Therefore, the raw sheet 3 is intermittently supplied through the gap through the nip roll 46, After the supply, the bolt head 43a moves upward as the die set shifts to the mold closing operation as described later, and accordingly, the sheet clamper 36 is pressed by the bolt head 43a. That is, the downward pressing on the clamper is released. Therefore,
This time, the spring 42 compressed to the stay bolt 41.
The elastic force of the sheet clamper 36 urges the sheet clamper 36 toward the upper blade 34.
It is tightly bitten between the upper blade 34 and the upper blade 34.

The original sheet 3 for forming the saw blade is
It is supplied as described above, and is supplied so as to protrude from the end surface of the upper blade 34 to the upper surface of the lower blade 37 by a certain length as illustrated. From this state, the die set mechanism is moved to the mold closing operation as shown in FIG. 9, and accordingly, the lower blade 37 is lifted to cut the raw sheet 3 into a sawtooth shape, and at the same time, after cutting. The sheet with a saw blade is pressed against a predetermined position which is the surface to be adhered of the carton blank P waiting above the sheet as shown in FIG.

In the present invention, prior to the pressing, hot air of 350 ° C. is blown onto the carton blank P immediately before the ultrasonic welding, as an example, through the blow-out nozzle 50, so that the bonded portion is approximately removed. 1 second,
When preheating was performed, ultrasonic welding, which conventionally took at least 0.2 seconds, could be shortened to 0.1 seconds. By the pressing operation that operates after the completion of preheating, a pressure sensitive switch (not shown) provided in the ultrasonic welding device 30 is turned on, and the welding device operates to melt the moisture-proof coating formed on the surface of the sheet. Then, the sheet 3 is adhered to a predetermined position of the carton blank P.

By the way, a welding state having a flat sealing surface with a sealing area of 8 × 300 mm was obtained by using an ultrasonic welding device of 2400 w. After the bonding work is completed as described above, the die set is brought into the mold open state, and a bonded carton blank of a sheet with a saw blade (a sheet punched with a saw blade so as to have an area of 10 × 300 mm) is attached. It is taken out from the die set mechanism. Thus, a new carton blank and a new original fabric sheet are supplied again, and the bonding work between the two is intermittently performed in the same manner as described above.

When the sheet with a saw blade is welded to the carton blank, the PE laminated coating layer previously formed on the surface of the vulcanized fiber is subjected to surface modification by corona discharge treatment or the carton blank. When a polyethylene emulsion was previously coated and dried on the adhesion site of the surface, the adhesion speed of both was further increased, and a strong adhesion state in which the paper layer was broken over the entire surface was obtained.

Furthermore, EVA (vinyl acetate content 14%) can be laminated on the surface of the vulcanized fiber, and in that case, it is better to subject the laminated surface to corona discharge treatment.

FIG. 12 shows the ultrasonic welding device described above.
It is also possible to use a configuration as shown in FIG. 5, that is, a type in which energy generated from the vibrator 30a is converted into vibration in the vertical direction of the horn 30c, and the configuration is not particularly limited.

[0040]

Since the present invention has the above-mentioned structure, it has the following effects. Since no adhesive is used, the cost is low, and the production speed can be increased more than the conventional metal cutting blade attachment speed. The adhesive gas does not adhere to the die blade for forming the saw blade. Since the welding uses ultrasonic waves, heat is not transmitted to the die blade, and therefore there is no trouble such as damage due to improper engagement of the die blade.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a vulcanized fiber saw toothed sheet.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a development view showing a carton blank to which the sheet with a saw blade is attached.

FIG. 4 is a perspective view showing a state where the carton blank shown in FIG. 3 is assembled and opened.

FIG. 5 is a perspective view showing a state in which, after opening the carton, the cooking sheet wound in a roll and stored in the carton is pulled out and cut.

FIG. 6 is a development view showing another form of the carton blank to which the above-mentioned vulcanized fiber saw toothed sheet is adhered.

FIG. 7 is a side view showing an example of an apparatus used for adhering the sheet with saw blades to a carton blank.

FIG. 8 is an enlarged cross-sectional view showing a state in which the die set mechanism in the apparatus is opened.

FIG. 9 is an enlarged cross-sectional view showing the mold closed state of the same.

FIG. 10 is an exploded perspective view of a main part of the same.

FIG. 11 is a conceptual plan view for explaining the bonding method according to the present invention.

FIG. 12 is a side view showing a modified example of the ultrasonic welding horn.

[Explanation of symbols]

 1 Raw material made of vulcanized fiber 2 Thermoplastic synthetic resin film 3, 4 Sheet with serrated blade 4a Serrated blade 12 Front plate 13 Back plate 14 Top plate 15 Lid plate 16, 17 Adhesive piece 18 Flap 19 Gable plate 20, 21, Break line 22 Difference Inserting piece 23 Temporary attaching piece 24 Locking slit 30 Ultrasonic welding device 30a Ultrasonic oscillator 30b Ultrasonic transducer 30c Horn 31 Upper bolster 32 Upper plate 34 Upper blade 35 Mounting plate 36 Sheet clamper 37 Lower blade 38 Lower blade mounting base 39 Lower Plate 40 Lower Bolster 41 Stay Bolt 41a Relief 42 Spring 43 Guide Rod 43a Bolt Head 44 Belt Conveyor 45 Pressing Roller 46 Nip Roll 50 Hot Air Blowing Nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Wakabayashi 300 Hiragaki, Fuji City, Shizuoka Prefecture Honshu Paper Manufacturing Co., Ltd.

Claims (4)

[Claims] 1. A sheet with a saw blade made of vulcanized fiber having a moisture-proof coating made of a thermoplastic synthetic resin film at a predetermined position of a carton blank consisting of a bottom plate, a front plate, a back plate, a gable plate and a lid. A high-speed bonding method for saw blades made of vulcanized fiber, characterized in that, when ultrasonically bonding through the formed thermoplastic synthetic resin film, the bonding site is preheated and then both are bonded. 2. The vulcanized fiber saw blade according to claim 1, wherein the thermoplastic resin film is a resin film having a low moisture permeability selected from any of a polyolefin resin film, a polyester resin film and a polyvinylidene chloride resin film. High speed bonding method. 3. A surface of a polyvinylidene chloride film formed on a serrated blade sheet is coated with polyethylene emulsion and dried, and then the serrated sheet is ultrasonically welded to a carton blank. Item 1. A high-speed bonding method for a vulcanized fiber saw blade according to Item 1. 4. A corona discharge treatment is applied to the surface of the thermoplastic synthetic resin film of the saw tooth blade sheet, and the saw tooth blade sheet is adhered to the carton blank by ultrasonic welding. A method for high-speed bonding of a saw blade made of vulcanized fiber according to any one of 1.