JPH07228072A - Bookbinding file - Google Patents

Abstract

PURPOSE:To provide a bookbinding file in which a book to be bound M% is uniformly bonded with a thermal active adhesive in a short time and a heat generation layer and the thermal active adhesive are easily fixed on a cover and its spreading properties are made favorable. CONSTITUTION:A thermal active adhesive 7 by which a heat generation layer 8 generating heat by electromagnetic induction is laminated is fitted to the spine 4' of the base material 5 of a cover constituting a file. The heat generation layer 8 is formed of woven fabric or nonwoven fabric consisting of metal or nonmetal, fiber made of metal or a wire rod made of metal which generate heat by electromagnetic induction. Thereby the heat generation layer 8 generates heat by the alternating field of electromagnetic induction and the thermal active adhesive 7 is activated. A book to be bound is bonded to the thermal active adhesive 7 in a short time. Further the thermal active adhesive 7 is passed through the heat generation layer 8 and thereby bonded to the spine 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bookbinding file, and more particularly, to a bookbinding file in which an object to be bound such as paper and documents is adhered with a heat-activatable adhesive to be bound. Is.

[0002]

2. Description of the Related Art As a conventional bookbinding file of this type, a file having a spine cover coated with a heat-activatable adhesive is known. As a bookbinding method for binding with this bookbinding file,
A method of activating a heat-activatable adhesive with a heater or the like as a heat source to bond a bookbinding object is known, but in this method, since the spine of the bookbinding file blocks heat transfer from the heater, a heat-activatable adhesive is used. There is a drawback that it takes time to raise the temperature of the agent.

Therefore, in order to solve this problem, a heating method using an electromagnetic induction heating device has been developed (Japanese Patent Laid-Open No. Hei 4).
-5090, JP-A-4-5092, JP-A-4-23
2791 publication). According to this electromagnetic induction heating method,
A heat-generating member made of a magnetic material is laminated or mixed in the hot-melt adhesive attached to the inside of the back of the cover material to heat the heat-generating adhesive in a short time by an alternating magnetic field of electromagnetic induction, There is an advantage that bookbinding can be performed by activating and adhering the cover sheet base material and the bookbinding object and then solidifying them.

[0004]

However, in the conventional bookbinding file of this type, when an iron plate or a stainless plate having a high non-permeability is used as the heat generating member, the heat generation rate is very high if the thickness is large. There is a problem that it is difficult to heat uniformly and it is difficult to heat uniformly, and part of the cover is scorched, or if the thickness is thin, it is difficult to heat uniformly because these metals have low thermal conductivity, and it takes time to raise the temperature. It was

Further, the bookbinding file in which a magnetic plate such as the iron plate or the stainless plate is interposed has a problem in safety because the edges of the iron plate or the stainless plate are sharp, and thus the bookbinding file is bound. For books, the back of the books is stiffer than necessary due to the high rigidity of these metals, and there is the problem that the spreadability is poor or the folds in the magnetic plate make it difficult to close the book. If this is done, there is a risk that the magnetic plate will suffer metal fatigue and damage.

Therefore, a method has been proposed in which a metal foil of aluminum, gold, copper or the like having a high non-permeability and good conductivity is laminated on the heat generating layer with a thermoplastic adhesive. However, the method using the magnetic plate and the metal foil requires an additional means such as an adhesive in order to fix the magnetic plate or the metal foil to the cover substrate, which increases the number of manufacturing processes and the accompanying manufacturing process. There is a problem of causing an increase in cost.

The present invention has been made in view of the above circumstances, and is capable of uniformly adhering a heat-activatable adhesive and a material to be bound in a short time, and does not require a means for fixing to a cover sheet and impairs spreadability. The purpose is to provide a bookbinding file that can be bound without a book.

[0008]

In order to achieve the above object, a bookbinding file of the present invention comprises a heat-generating layer and a heat-activatable adhesive which are heated by an electromagnetic induction heating means on an inner portion of a cover substrate constituting the file. In the bookbinding file having the above, the heat generating layer is a woven or non-woven fabric, a metal fiber or a metal wire made of metal or non-metal which generates heat by electromagnetic induction (claim 1).

In the present invention, the heating layer and the heat-activatable adhesive are formed so that they can be bent at arbitrary positions, and
It is preferable to bond the end piece to the surplus portion of the heat-activatable adhesive (claim 2).

Further, it is preferable that the cover portion of the cover substrate is formed so that it can be cut to an arbitrary length (claim 3).

In the bookbinding file of the present invention, the metal used for the heating layer is, for example, iron, stainless steel,
Metals such as nickel and magnesium or their composites can be used. Examples of non-metals include synthetic fibers such as polyacrylonitrile-based, polyamide-based, polyester-based, polyurethane-based, polyvinyl alcohol-based, etc., or cellulose-based, etc. Regenerated fibers of the above, and natural fibers such as cotton and silk can be used.

Examples of the heat-activatable adhesive include ethylene / vinyl acetate copolymer (EVA), polyolefin resin, polyester resin, polyamide resin,
Polyurethane-based resin or the like can be used.

[0013]

According to the bookbinding file of the present invention configured as described above, the heat-activatable adhesive for laminating the heat-generating layer which is heated by the electromagnetic induction heating means is provided on the inner side of the bookbinding file. When an alternating magnetic field of electromagnetic induction as a heating means is applied to the heat generating layer in a state where the article to be bound is contacted with the heat generating layer, the heat generating layer generates heat in a short time, and this heat melts the heat activated adhesive to Can be glued. At this time, by using a woven fabric, a non-woven fabric, a metal fiber, or a metal wire rod made of a metal or a non-metal for the heat generating layer, the flexibility of the heat generating layer is increased, and the spreadability caused by the back cover portion being harder than necessary. It is possible to prevent a problem that the book is bad or a fold is generated to make it difficult to close the book, or a problem that metal fatigue causes damage. Further, since the heat-activatable adhesive passes through the heat-generating layer and adheres to the spine cover portion when the heat-generating layer generates heat, a means for previously fixing the heat-generating layer to the spine cover portion is unnecessary (claim 1).

Further, with at least one of the covers not folded, the article to be processed is brought into contact with the heat-activatable adhesive for laminating the heat-generating layer, and the surplus portion of the heat-activatable adhesive is melted or cooled. Bending can make it possible to perform bookbinding regardless of the thickness of the bookbinding object (claim 2).

Further, by cutting the surplus portion of the cover portion, it is possible to adjust the displacement of the cover portion of the portion conceivable to the surplus portion of the bookbinding product due to the heat generating layer, and the beauty of the bookbinding file is impaired. It can be prevented (Claim 3).

[0016]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of an example of a bookbinding file according to the present invention, and FIG. 2 is an enlarged sectional view of a II portion of FIG. 1, FIG.
FIG. 3 is a perspective view of the heat activated adhesive portion of FIG. 2.

The bookbinding file 1 of the present invention includes a cover substrate 5 in which a cover 2a and a back cover 2b are foldable via a spine 4 (back part), and inside the spine 4 of the cover substrate 5. It is configured as an adhesive section 6 to be installed. In this case, the cover substrate 5 is made of, for example, an inorganic material such as ceramics or metal, cloth such as paper, synthetic paper, woven cloth, non-woven cloth or the like, synthetic resin such as polyvinyl chloride, polyurethane, phenol, etc. It may be flexible or flexible, and may be transparent or opaque.

As shown in FIGS. 2 and 3, the adhesive portion 6 is formed by laminating a heat-activatable adhesive 7 and a heat generating layer 8, and the heat generating layer is generated by a high frequency magnetic field of a bookbinding machine 10 of an electromagnetic induction heating type which will be described later. The heat activated adhesive 7 is melted by the self-heating of 8. In this case, the heating layer 8
As shown in FIG. 4, it is formed of a metal-nonmetal mixed woven fabric in which metal fibers 30 arranged in the longitudinal direction and non-metal fibers 31 arranged in the transverse direction are woven so as to cross each other. ing.

The structure of the heat generating layer 8 does not necessarily have to be a metal-nonmetal mixed woven fabric as shown in FIG. 4, and for example, as shown in FIG. 5, on the nonmetal fibers 31 arranged in the lateral direction. The metal fibers 30 are arranged in the longitudinal direction by intersecting
For example, it may be in the form of a mesh adhered with an acrylic adhesive, or as shown in FIG. 6, a large number of metal wire rods 33 are arranged and adhered on the nonwoven fabric 32 at appropriate intervals, Alternatively, as shown in FIG. 7, a large number of metal wire rods 33 may be arranged in parallel at appropriate intervals.

The adhesive portion 6 does not necessarily have to have such a laminated structure. For example, as shown in FIG.
The heat activated adhesive 7 and the heat generating layer 8 may be laminated in a sandwich.

The heat-activatable adhesive 7 of the adhesive portion 6 constructed as described above is formed of a base polymer, waxes, a plasticizer, a tackifier, an antioxidant, a filler, etc., and serves as a base polymer. For example, ethylene / vinyl acetate copolymer (EVA), polyolefin resin, polyester resin, poamide resin, polyurethane resin, etc. can be used.

The metal used for the heat generating layer 8 is
For example, a metal such as iron, stainless steel, nickel, or magnesium, or a composite material thereof can be used. Examples of the nonmetal include polyacrylonitrile-based, polyamide-based, polyester-based, polyurethane-based, polyvinyl alcohol-based, etc. synthetic fibers. Alternatively, regenerated fibers such as cellulosics and natural fibers such as cotton and silk can be used.

Next, a procedure for binding the bookbinding object A using the bookbinding file 1 configured as described above will be described. First, as shown in FIG.
The end of the bookbinding product A is brought into contact with the heat-activatable adhesive 7 of the character-shaped bookbinding file 1. Next, in this state, the heat-generating layer 8 self-heats due to the high-frequency magnetic field generated by the heating means of the bookbinding machine 10 to melt and solidify the heat-activatable adhesive 7, whereby the bookbinding product A is bonded. During or after this heating, the excess portion of the bookbinding product A in the adhesive 7 is bent together with the back cover 2b, and the bookbinding operation is completed.

Incidentally, in FIG. 9, the cover 2a is bent to L
Although the case of binding using the letter-shaped bookbinding file 1 has been described, as shown in FIG. 10, the bookbinding product A is brought into contact with the adhesive 7 without bending the front cover 2a and the back cover 2b, During heating by the heating means of the bookbinding machine 10 as described above,
Alternatively, the front cover 2a and the back cover 2b may be bent after heating.

In the above embodiment, the case where the front cover 2a and the back cover 2b of the cover substrate 5 have the same width has been described. In this case, the surplus portion of the bookbinding product A in the heat activated adhesive 7 is described. There is a risk that the front cover 2a and the back cover 2b will have the same width, and the aesthetics of the bookbinding file will be impaired. Therefore, in order to solve this problem, FIG.
As shown in FIG. 5, by forming any part of the front cover 2a or the back cover 2b (the case of the back cover 2b is shown in the drawing) so that it can be cut, a part corresponding to the surplus part of the bookbinding product A in the bonding portion 6 is formed. B can be cut, and the aesthetics of the bookbinding file 1 can be improved (see FIG. 12).

In FIGS. 11 and 12, the bookbinding machine 10 is
The case where the heat-activatable adhesive 7 is activated to perform bookbinding and the surplus portion B of the front cover 2a and the back cover 2b is cut at the end is described, but it is not always necessary to perform such an order, and for example, first, After cutting the excess portion B, the heat-activatable adhesive 7 may be activated by the bookbinding machine 10 to perform bookbinding.

On the other hand, as shown in FIGS. 17 and 18, the bookbinding machine 10 is arranged so that the heating surface is located in a short opening 13 formed in the upper surface of the box-shaped bookbinding machine body 12. The heating means 11 is formed by the electromagnetic induction heating coil 14 which is a heating body and the high frequency oscillator 15 which is a high frequency supply source for supplying a high frequency current to the heating coil 14, and the bookbinding file 1 is provided above the opening 13. It has a structure in which a file support portion 16 for vertically supporting is provided.

In this case, the file support 16 includes a fixed support 17a which is arranged to face the long side of the opening 13 and a movable support 17b which is arranged so as to be movable back and forth with respect to the fixed support 17a. It is composed of and
Adjustment knob 1 that can slide along the guide groove provided on the
With 9 supports 17a, 17b of the file support 16
The interval between them can be adjusted according to the thickness of the bookbinding file 1. In this case, both supports 1
Both 7a and 17b may be formed to be able to move back and forth. The fixed support body 17a and the movable support body 17b thus formed are formed in a tapered shape in which the upper sides of the facing surfaces are outwardly widened, so that the bookbinding file 1 can be easily inserted. There is.

A sensor 20 for detecting the presence / absence of the bookbinding file 1 is provided on the lower facing surfaces of the supports 17a, 17b.
20, the signals from the sensors 20, 20 are transmitted to the control unit 21, and the signals controlled by the control unit 21 are supplied to the high frequency oscillator 15, the lamp 22, and the buzzer 23.
Etc. are transmitted to the display means. In this case, the sensors 20 may detect the thickness of the bookbinding file 1 to control the supply time of the high frequency current of the high frequency oscillator 15.

As shown by phantom lines in FIGS. 17 and 18, it is possible to provide a cooling section 24 for cooling the bookbinding file 1 after heating at a position adjacent to the file support section 16. The cooling unit 24 includes, for example, a hollow file mounting table 25 having a large number of cold air vents 25a, 25a ... Arranged on the upper surface of the bookbinding machine main body 12, and cool air inside the internal passage 26 of the file mounting table 25. Fan 2 for blowing air
7 can be formed. 17 and 18
In the figure, reference numeral 28 is a main switch and 29 is a power source.

Next, a specific structure of another embodiment of the bookbinding file of the present invention will be described with reference to FIGS. 13, 14 and 17. Since the structures of the cover substrate 5 and the adhesive portion 6 of the bookbinding file 1 are the same as those in the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

FIG. 13 shows the product A to be bound and the cover (cover 2a).
FIG. 14 is a partial cross-sectional perspective view of the bookbinding file in which the end piece 3 is provided between and, and FIG. 14 is a cross-sectional view of the bookbinding state.

In order to bind the bookbinding object A such as papers and documents using the bookbinding file 1 and the bookbinding machine 10 having the above-described structure, first, as shown in FIG. 4 is contacted with the heat-activatable adhesive 7 attached to the sheet 4 in a state in which the work piece A or the book piece A and the facing 3 are aligned, and together with the heat generating layer 8 and the adhesive 7 the front cover 2a (or the back cover 2).
Fold b).

Then, from the spine cover side of the bookbinding file 1, the supports 17a, 17b of the file supporting portion 16 of the bookbinding machine 10 are formed.
The bookbinding file 1 is inserted between them, the spine cover 4 of the bookbinding file 1 is placed on the heating surface of the heating coil 14, and the movable support 1
7b by moving the fixed support 17a and the movable support 17b
Bookbinding file 1 with bookbinding file 1 sandwiched between
Stand upright. At this time, the main power supply 28 is set to the ON state. Then, the insertion of the bookbinding file 1 is confirmed by the sensors 20, 20, the lamp 22 is turned on in response to the output signal from the control unit 21, and the high-frequency current is supplied from the high-frequency oscillator 15 to the heating coil 14, so that the heating coil is heated. A high frequency magnetic field is generated at 14.

The adhesive portion 6 attached to the spine cover 4 of the bookbinding file 1 by the high frequency magnetic field generated in the heating coil 14.
The heat generating layer 8 self-heats within a short time (several tens of seconds) due to the hysteresis loss and the eddy current, and the heat activates the heat-activatable adhesive 7 and the ends of the bookbinding product A and the end piece 3 and the side thereof. It penetrates into the space between the parts, and the bookbinding product A and the end piece 3 are bonded in the bookbinding file 1. And the heat activated adhesive 7
When is completely melted, the buzzer 23 sounds and the high frequency oscillator 15 notifies the end of high frequency application. Therefore, if the bookbinding file 1 is taken out from the file supporting portion 16 and cooled by the cooling portion 24, the heat-activatable adhesive 7 is hardened and the binding of the bookbinding product A is completed.

In the above embodiment, the heat-activatable adhesive 7 is brought into contact with the book-making product A or the book-making product A and the end piece 3, and the heat-activatable adhesive 7 is activated and bonded in a bent state. Alternatively, the heat-activatable adhesive 7 may be first activated or may be activated and then bent in a solidified state. Further, the case where the bookbinding file 1 is placed on the upper surface of the bookbinding machine 10 and the bookbinding object A is adhered in the bookbinding file 1 has been described, but such an adhering method is not necessarily required, and the bookbinding machine 10 may be used. The bookbinding file 1 can be set upright and set on the file support 16 from the side.

Further, in the above embodiment, the cover sheet 2a and the back cover sheet 2b are misaligned by the width of the surplus portion of the bookbinding product A in the heat-activatable adhesive 7, which may impair the beauty of the bookbinding file 1. is there. Therefore, in order to solve this problem, as shown in FIG. 15, a front cover 2a or a back cover 2b is used.
By forming any part of the book to be cuttable, the part B corresponding to the surplus part of the bookbinding product A in the heat generating layer 8 or the heat-activatable adhesive 7 can be cut, and the appearance of the bookbinding file 1 is improved. (See FIG. 16).

Next, examples and comparative examples when the bookbinding file of the present invention is used for various bookbinding products A will be described.

[Example 1] (1-1) Preparation of heat-generating layer and hot-melt adhesive layer 50 μm stainless fiber (metal fiber) is oriented in the vertical direction, and 50 μm polyester fiber (non-metal fiber) is oriented in the horizontal direction. The stainless steel fibers were bonded to each other with a general acrylic adhesive at 1 mm intervals so as to be orthogonal to one of the polyester fibers. Next, on the stainless fiber surface of the heat generating layer, a melting temperature of 70
A heat of ℃ was applied to bond them.

(1-2) Bookbinding when the thickness of the bookbinding product A is 3 mm Inside the spine cover 4 of the cover substrate 5 which is slightly larger than the bookbinding product A, the hot prepared in (1-1) Cut the melt adhesive (heat activated adhesive) to a width of 10 mm,
It was set so that the hot-melt adhesive was on the product side. Then, the work piece A having the end piece 3 is brought into contact with the bent side of the hot melt adhesive, and the hot melt adhesive is activated by using an electromagnetic induction heating device (high frequency current 30 KHz). In this state, the excess hot-melt adhesive portion 7 mm was bent together with the cover portion, the hot melt adhesive and the side surface of the facing 3 were adhered, and then the excess portion of the cover portion was cut.

The bookbinding file obtained as described above has good spreadability because it has flexibility in the lateral direction of the back, and even if the bookbinding product is opened 360 degrees and then closed. The book was never hard to close. The hot melt adhesive passes through the heat generating layer 8 and passes through the spine cover 4
Was well adhered to.

[Example 2] (2-1) Bookbinding when the thickness of the bookbinding product A is 15 mm The [Example 1] is provided inside the spine cover 4 of the cover substrate 5 which is slightly larger than the bookbinding product A. ] The hot melt adhesive prepared in (1-1) in [1] was cut to have a width of 20 mm, and the hot melt adhesive was set on the bookbinding side. Then, the work piece A having the end piece 3 is brought into contact with the bent side of the hot melt adhesive, and the hot melt adhesive is activated by using an electromagnetic induction heating device (high frequency current 30 KHz). After this, the surplus hot-melt adhesive portion of 5 mm was bent together with the cover portion, the hot melt adhesive and the side surface of the facing 3 were adhered, and then the surplus portion of the cover portion was cut.

The bookbinding file obtained as described above has a good spreadability because it has flexibility in the lateral direction of the back, and even when the bookbinding product is opened 360 degrees and then closed. The book was never hard to close. The hot melt adhesive passes through the heat generating layer 8 and passes through the spine cover 4
Was well adhered to.

[Example 3] (3-1) Preparation of heat-generating layer and hot-melt adhesive layer 50 μm stainless steel fibers were arranged at 1 mm intervals, and one of them was melted at a hot-melt adhesive temperature of 70 ° C. (ethylene / acetic acid). The vinyl copolymer, 500 μm) was adhered by applying heat at 60 ° C.

(3-2) Bookbinding when the thickness of the bookbinding product A is 15 mm Inside the spine cover 4 of the cover substrate 5 which is slightly larger than the bookbinding product A, the hot prepared in (3-1) The melt adhesive was cut to have a width of 20 mm, and the hot melt adhesive was set so as to be on the bookbinding side. Then, the bookbinding product A having the end piece 3 on the bent side of the hot melt adhesive
Abutting against, electromagnetic induction heating device (high frequency current 30KHz)
Activate the hot-melt adhesive with the use of, and with the hot-melt adhesive activated, bend the surplus hot-melt adhesive part 5 mm together with the cover part to bond the hot-melt adhesive and the side face 3 After that, the surplus portion of the cover was cut.

The bookbinding file obtained as described above has good spreadability because it has flexibility in the lateral direction of the back, and even when the bookbinding product is opened after being expanded 360 degrees. It wasn't difficult to close. Also,
The hot melt adhesive passed through the heat generating layer 8 and was sufficiently adhered to the spine cover.

Comparative Example (4-1) Preparation of Heating Layer and Hot Melt Adhesive Layer One of commercially available stainless steel magnetic plates (100 μm) was coated with a hot melt adhesive (ethylene / vinyl acetate mixture) having a melting temperature of 70 ° C. The polymer (500 μm) was adhered by applying heat of 60 ° C.

(4-2) Bookbinding when the thickness of the bookbinding product A is 15 mm Inside the spine cover 4 of the cover substrate 5 which is slightly larger than the bookbinding product A, the hot prepared in (4-1) The melt adhesive was cut to have a width of 20 mm, and the hot melt adhesive was set so as to be on the bookbinding side. Then, the work piece A having the end piece 3 is brought into contact with the bent side of the hot melt adhesive, and the electromagnetic induction heating device (high frequency current 30 KH
z) was used to activate the hot-melt adhesive, and after the hot-melt adhesive was activated, the surplus hot-melt adhesive portion 5 mm was bent together with the cover portion, and the hot-melt adhesive and the side face 3 were bonded together. After that, the surplus portion of the cover was cut.

Since the bookbinding file obtained as described above uses a stainless steel magnetic plate having high non-permeability in the back, the stainless steel magnetic plate locally abnormally generates heat due to electromagnetic induction heating, and thus the cover sheet. Charring was seen in part of 2a. Further, the back part of the file is hard, and when this bookbinding product is opened 360 degrees and then closed, the magnetic plate in the expanded part opens more than the part with the creases.

The heating layer used in the above [Example 1] to [Example 3] was replaced with stainless steel fiber, and iron,
Good results were similarly obtained when the fibers were made of nickel, magnesium, or composite physical properties thereof.
Further, the heating layer, iron, a fiber made of metal such as stainless steel, and the above-mentioned polyacrylonitrile-based, synthetic resin such as polyamide-based, cellulose-based regenerated fiber or a woven fabric mixed with natural fibers such as cotton and silk The same good results were obtained in the case of doing.

[0051]

As described above, since the bookbinding file of the present invention is configured as described above,
The following effects can be obtained.

1) According to the bookbinding file of claim 1, since the heat generating layer is formed of a woven or non-woven fabric, metal fiber or metal wire made of metal or non-metal which generates heat by electromagnetic induction, the heat generating layer is sharp. Not only is it safe, but also because it can be easily fixed to the back cover, fixing means or steps can be omitted, and productivity can be improved. Further, since the spine cover can be prevented from being harder than necessary, the spreadability of the bookbinding product can be improved and the convenience of using the bookbinding product can be enhanced.

Furthermore, since the alternating magnetic field of electromagnetic induction can generate heat in a short time, the adhesive can be uniformly activated and the article to be bound can be evenly bonded.

2) According to the bookbinding file of the second aspect, the heat generating layer and the heat-activatable adhesive are formed so that they can be bent at any positions, and the surplus portion of the book-binding material in the heat-activatable adhesive is turned over. Since they are adhered, in addition to the above 1), bookbinding can be performed according to an arbitrary thickness of the bookbinding object.

3) According to the bookbinding file of claim 3, the cover portion of the cover substrate is formed so that it can be cut to an arbitrary length. Therefore, in addition to the above 1), the bookbinding in the heat activated adhesive is performed. It is possible to adjust the deviation of the cover portion of the portion corresponding to the surplus portion of the object, and prevent the beauty of the bookbinding file from being impaired.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a bookbinding file according to the present invention before use.

FIG. 2 is an enlarged cross-sectional view of section II of FIG.

FIG. 3 is a perspective view of an adhesive portion in the present invention.

FIG. 4 is a perspective view showing an example of a heat generating layer in the present invention and an enlarged sectional view of a III part thereof.

FIG. 5 is a perspective view showing another example of a heat generating layer and an enlarged sectional view of an IV portion thereof.

FIG. 6 is a perspective view showing still another example of a heat generating layer.

FIG. 7 is a perspective view showing still another example of a heat generating layer.

FIG. 8 is a perspective view showing another structure of an adhesive portion in the present invention.

FIG. 9 is a cross-sectional view showing a bent state of a bookbinding file.

FIG. 10 is a cross-sectional view showing another bending state of the bookbinding file.

FIG. 11 is a cross-sectional view showing a state before cutting of a surplus portion of a cover portion of a bookbinding file.

FIG. 12 is a cross-sectional view showing a state after the excess portion of the cover portion of the bookbinding file is cut.

FIG. 13 is a partial cross-sectional perspective view showing a usage state of another embodiment of the bookbinding file according to the present invention.

14 is a cross-sectional view showing a bookbinding state of the bookbinding file shown in FIG.

FIG. 15 is a cross-sectional view showing a state before cutting of an excess portion of a cover portion of the bookbinding file shown in FIG.

16 is a cross-sectional view showing a state after a surplus portion of a cover portion of the bookbinding file shown in FIG. 13 is cut.

FIG. 17 is a cross-sectional view showing a bookbinding state by the bookbinding machine.

FIG. 18 is a schematic perspective view of a bookbinding machine.

[Explanation of symbols]

 2a Cover 2b Back cover 3 Back cover 4 Back cover 5 Cover base material 6 Adhesive part 7 Thermally activated adhesive 8 Heating layer 30 Metal fiber 31 Non-metal fiber 32 Non-woven fabric 33 Metal wire A A

Claims (3)

[Claims] 1. A heat-generating adhesive comprising: a cover substrate having a cover portion and a spine; and a heat-activatable adhesive having a heat-generating layer laminated on the spine of the cover substrate to generate heat by electromagnetic induction. In a bookbinding file in which the active adhesive is melted and bound by heat generation of a layer, the heat generation layer is a woven or non-woven fabric, a metal fiber or a metal wire made of metal or non-metal that generates heat by electromagnetic induction. A binding file to do. 2. The bookbinding file according to claim 1, wherein the heat-generating layer and the heat-activatable adhesive are formed so that they can be bent at arbitrary positions, and the flap is bonded to the surplus portion of the book-binding material in the heat-activatable adhesive. Bookbinding file characterized by 3. The bookbinding file according to claim 1, wherein the cover portion of the cover substrate is formed so as to be cut into an arbitrary length.