JP2020192710A - Bookbinding method for threaded softcover book - Google Patents

Abstract

To provide a bookbinding method for a threaded softcover book capable of obtaining the threaded softcover book with an excellent spread property, by applying a bookbinding technique of an unbound booklet.SOLUTION: In the bookbinding method for a threaded softcover book 1, three layers of a prescribed adhesive are coated on a spine 2a of a book body 2. A first adhesive 3 that displays flexibility after hardening is coated, then a second adhesive 4 is provided on an entire surface thereof in an irregular state and dried, then a third adhesive layer 5 is further coated on the top of the irregular coated surface for adhering a spine cover 7. It is preferable to use the same kind of adhesive as the first adhesive for the third adhesive. Furthermore, if a facing is to be provided, it is preferable to use a sheet having a unit basis weight larger than that of the sheet for a cover 6 as a facing sheet. Various glued-on covers can be used for the cover.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bookbinding technique for thread binding and bookbinding, specifically, a bookbinding method for thread binding and bookbinding having excellent spreadability.

Normal binding basically emphasizes cost and productivity rather than robustness and durability, and is used for binding such as flat binding, perfect binding, ajiro binding, thread binding, etc. It is finished with a cover attached. In particular, so-called thread-bound books, which are finished by attaching a wrapping cover to the text closed by thread-binding, are published every year as soft-cover books such as books, new books, paperback books, and photo books.

Hot-melt adhesives are often used to harden the spine and attach the wrapping cover to commercially available thread binding and book binding. When applying the adhesive, the low-viscosity adhesive melted by heating wraps around the throat between the text and the back cover (cover), where the cover and the back edge of the first sheet of paper in contact with it wraps around. As a result of the adhesion, there was a problem that the first sheet of the text could not be opened well.

Recently, a simple bookbinding method called Codex binding is also on the market. This Codex outfit is tailored so that the spine of the thread-bound text is hardened so that the thread-bound spine can be seen, and it opens to the throat and has good spreadability. Usually, this regular book is wrapped in a small fold cover that folds inward on the small side, so the cover is easy to come off, and in that case the spine of the text can be seen as it is, so the purchaser who cares about it There are also many.

By the way, the present inventor has made extensive studies to improve the spreadability of the perfect binding booklet, and when any page of the text is opened, the vicinity of the throat portion does not rise, and the left and right pages opened are approximately 180. We have proposed and developed a perfect binding booklet that can be spread well in the open state (see Patent Documents 1 and 2), and have put it on the market as a horizontally open notebook (registered trademark). In this bookbinding method, a first adhesive that exhibits flexibility after curing and a second adhesive that exhibits high backing strength after curing are sequentially applied to the entire back surface of the text. Is the basic feature.

Japanese Patent No. 5743362 Japanese Patent No. 6315534

The present inventor also binds a thread-bound text by using the binding method of the perfect binding booklet, which does not show the spine of the text unlike the Codex binding and has excellent spreadability similar to the perfect binding booklet. We have been studying hard to see if it can be done. Initially, I tried to simply press the wrapping cover against the back of the text to which the first adhesive and the second adhesive were applied in sequence, but I was not satisfied with the spreadability. Further, an attempt was made to further apply various adhesives such as a conventional back glue to the back surface of the text to which the first adhesive and the second adhesive were sequentially applied, but the spreadability was also not sufficiently convincing. It was. In either case, when opening any page of the obtained normal book, the throat part must be pressed from above in order to open it approximately 180 °, and when pressed and opened, the spine is visible. There was a problem that it was distorted. As a result of further studies on the type of adhesive, coating amount, coating method, etc., by providing the second adhesive in an uneven shape on the first adhesive coating surface, excellent spreadability is achieved even in thread binding and bookbinding. We have obtained a new finding that it can be obtained, and have completed the present invention.

That is, an object of the present invention is to provide a bookbinding method for thread binding and parallel binding, which can obtain a thread binding and parallel binding having excellent spreadability by applying the bookbinding technique for the perfect binding booklet.

According to one aspect of the present invention, the object is a text binding step of thread-binding a text obtained by collating a folded printed book or a blank sheet of paper, and curing on the back surface of the text. The undercoating step of applying the first adhesive, which will later show flexibility, and the intermediate coating step of providing the second adhesive in an uneven shape on the entire surface of the first adhesive-coated surface and drying the adhesive. Bookbinding of thread binding and bookbinding, which comprises a top coating step of further applying a third adhesive layer to the entire surface of the second adhesive coating surface, and a cover attachment step of adhering a wrapped cover to the text. Achieved by the method.

According to the bookbinding method of thread binding and bookbinding of the present invention, three layers of a predetermined adhesive are applied to the spine of the text, and the first adhesive that exhibits flexibility after curing is applied to the entire surface. A second adhesive was provided in an uneven shape and dried, and then a third adhesive layer for adhering the spine was applied on the uneven coating surface. It is possible to bind a thread-bound bookbinding having an excellent spreadability equal to or better than that of a codex-wrapping without showing the thread-bound spine like a binding.

It is a figure for demonstrating an example of the bookbinding method of the thread binding parallel bookbinding of this invention. It is a figure which shows an example of the 2nd adhesive application surface in the intermediate coating process. It is a figure which shows another example of the 2nd adhesive application surface in the intermediate coating process. It is a figure which shows still another example of the 2nd adhesive application surface in an intermediate coating process. It is a figure which shows still another example of the 2nd adhesive application surface in an intermediate coating process.

Hereinafter, an embodiment of the bookbinding method for thread binding and bookbinding of the present invention will be described in detail for each step with reference to FIGS. 1 to 5 attached. FIG. 1 is a diagram for explaining the bookbinding method by an example of a thread binding parallel bookbinding obtained by the bookbinding method of the present invention. In this figure, reference numeral 1 is thread binding, 2 is the text, 3 is the first adhesive, 4 is the second adhesive, 5 is the third adhesive, 6 is the front cover (back cover), and 7 Is the spine cover and 8 is the back cover (front cover). Here, the terms "front cover (back cover)" and "back cover (front cover)" are used because some books have right binding and left binding (the same applies hereinafter). Further, FIGS. 2 to 5 are views showing examples of the second adhesive-coated surface in the intermediate coating step. For each part in FIGS. 2 to 5, the same reference numerals as those for the corresponding parts in FIG. 1 are used. The bookbinding method for thread binding and bookbinding of the present invention is not limited to the following embodiments. Further, in the following description, reference numerals will be given to the members and raw materials in the attached drawings.

(1) Text binding process First, the text 2 which is a main component of thread binding and book binding will be described. Regardless of the type of paper that composes text 2, the paper that is normally used for these texts is selected according to the type of books such as magazines, notebooks, paperback books, books, pamphlets, and photo books. It can be used without any particular restrictions. Specific examples of such paper include non-coated printing paper such as high-grade printing paper, intermediate-grade printing paper, low-grade printing paper, and thin-leaf printing paper; finely coated printing paper; art paper, coated paper, lightweight coated paper, and the like. Coating printing paper; special printing paper such as color high-quality paper; information paper such as copying paper and copy paper, and the like, which can be used alone or in combination of two or more.

The rice basis weight of the paper is not particularly limited, and for example, a paper in the range of ^{20 to} 150 g / m ² can be used. For example, when a book is bound as a normal bookbinding, paper having a paper density of about 60 to 90 g / m ² is usually used. Further, when binding a dictionary, although it depends on the thickness, thin and non-transparent Indian paper (thin leaf printing paper) having a paper density of about 20 to 40 g / m ² is usually used.

The paper may or may not be printed on one or both sides of the paper. If the paper is unprinted sheet paper or printed book, it is cut off and folded if necessary according to a conventionally known method. The signatures obtained in this way are collated, and each spine is thread-stitched from the signature at the beginning to the signature at the end. Since the spine of a bundle of text for one thread bound is usually thicker than the central area or the edge, it is necessary to perform spine leveling by pressing the spine as necessary. it can. These cutting, folding, collating, thread binding and spine leveling can each be performed using a machine.

(2) Fold-back assembly process In the text 2 of the above-mentioned one volume, if necessary, the fold-back (not shown) is folded in half on the front and back so as to sandwich it in the thickness direction. It can be provided together with the spine of the text 2. In this case, in addition to the paper used for the paper of the main text 2, the paper can be appropriately selected from the paperboards such as chip balls, yellow balls, and white paperboards, and is usually more rice than the papers of the main text. The one with a large basis weight is used. More preferably, the back cover paper has a larger paper density than the cover page. By using a back cover having a paper density larger than that of the cover in this way, even if several pages at the beginning or end of the main text 2 are opened, the open state can be maintained by the weight, and the spreadability can be further improved.

Next, an undercoating step or a topcoating step is performed on the entire surface of the spine 2a of the main text 2 as follows. These steps may be performed for each of the texts 2 of one volume, or the texts of a plurality of volumes may be aligned and overlapped. When applying the adhesive, it is preferable to fix the text 2 of one volume or the text of multiple volumes so that they do not shift.
(3) Undercoating Step The first adhesive 3 is primed on the back surface 2a of the text 2 for one volume or the back surface of the text for a plurality of volumes. Here, as the first adhesive 3, an adhesive that makes the adhesive itself flexible by curing is used. As such an adhesive, for example, an acrylic copolymer emulsion adhesive (acrylic resin) in which an acrylic copolymer (nonvolatile content 60 to 70% by weight based on the total amount of the adhesive) is used as a main component and suspended in water. (Based emulsion adhesive) can be preferably used. The adhesive may contain, for example, a trace amount of methyl methacrylate, vinyl acetate, or the like. Specific examples of the first adhesive 3 include MB adhesive 22-686 (manufactured by Hisao Matsumoto Shoten Co., Ltd.) and the like.

The first adhesive 3 should be used as it is at the time of purchase without dilution. Therefore, it is preferable that the first adhesive 3 has a feature of being excellent in coating workability and a feature of being flexible and exhibiting high adhesiveness after curing. Further, the viscosity of the first adhesive 3 varies greatly depending on its components and operating environment conditions, so it cannot be said unconditionally, but for example, the nominal viscosity published in catalogs, technical data, etc. presented by the adhesive manufacturer. Speaking at (25 ° C.), it seems that about 13000 mPa · s is a guide. In addition to the above adhesives, any adhesive that exhibits substantially the same flexibility and adhesiveness is not limited to the acrylic resin emulsion adhesive, and can be used in the bookbinding method of the present invention without particular limitation.

The method for applying the first adhesive 3 is not particularly limited, and various conventionally known methods such as roller coating and brush coating can be adopted. Further, a coating method using various conventionally known coating machines such as a roll coater and a bar coater may be used. The coating amount or coating thickness of the first adhesive 3 is not particularly limited as long as it is applied in layers on the back surface 6 of a bundle of a plurality of volumes so that unevenness is not visually observed as much as possible, but as a rough guideline for the coating amount. Is preferably set in the range of about 200 to 550 g, preferably 220 to 500 g, and more preferably 230 to 450 g per 1 m ² .

Immediately after the application, a strip-shaped reinforcing material (not shown) having the same size as or narrower than the back surface 2a of the main text 2 can be laid on the surface of the first adhesive layer 3. Examples of the reinforcing material include non-woven fabric, cheesecloth, tissue paper, and so-called spine paper such as kraft paper, wrinkle paper, and ground rolling paper. This reinforcing material shall also include flower cloth and the like. Further, in this step, if necessary, one end of the bookmark may be adhered to the second adhesive 4 to provide the bookmark.

After applying the first adhesive 3 or laying a reinforcing material on the back surface 2a of the main body 2, it is preferable to dry the coated surface for an appropriate time to cure it. As a guideline for drying, it is sufficient that the coated surface of the first adhesive 3 is touched and does not adhere to the fingers. If the drying time is specified, it can be appropriately set in the range of, for example, about 0.5 to 2 hours, although it depends on the season and the atmospheric conditions of the bookbinding site. This is because it can be visually confirmed that the coated surface is being cured and the coating surface becomes sticky within the range of the drying time. For example, in consideration of work efficiency and the like, the process may proceed to the next step after an appropriate time elapses within the time range. Drying may be carried out using a conventionally known instrument such as a dryer, but it is sufficient to leave it in a room or the like.

The first adhesive 3 may be divided into two parts and applied over the entire back surface of the main body 2. In this case, after the first application, if necessary, a reinforcing material is laid as described above, and when the surface of the application surface is cured as described above, the second application is subsequently applied in layers on the entire surface of the first application surface. It is good to do. The guideline for the second drying can be set to the same level as the first drying. When the reinforcing material is used as described above, it can be laid immediately after the first time or immediately after the second time. As long as the first and second adhesives have the above-mentioned characteristics, the same type of adhesive may be used, or different types of adhesives may be used. For drying, a conventionally known instrument such as a dryer can be used, but it may be allowed to stand indoors or the like for drying.

(4) Intermediate coating step Next, the second adhesive 4 is provided unevenly on the entire coated surface of the first adhesive 3. Here, "providing the second adhesive 4 in an uneven shape" means forming unevenness on the adhesive-applied surface immediately after or during application of the second adhesive 4, and the unevenness is formed. The method is not particularly limited. As a method of forming irregularities immediately after the application of the third adhesive 5, specifically, a jig having a large number of protrusions such as a brush is pressed against the surface immediately after the application of the third adhesive 5. Examples thereof include a method of forming a large number of dents or dents and protrusions. The method of applying the second adhesive 4 is not particularly limited, and as in the case of the first adhesive 3, in addition to conventionally known methods such as roller coating and brush coating, conventional methods such as a roll coater and a bar coater are used. A coating method using various known coating machines or the like may be used.

FIG. 2 shows the state of a large number of dents formed on the coated surface of the second adhesive 4 by such a method. As shown in this figure, in the second adhesive 4, a large number of dents 10 are formed by pressing a jig such as a brush against the entire coated surface of the first adhesive 3 after application and before curing. There is. Further, FIG. 3 shows the state of a large number of dents and protrusions formed by using the same jig. Immediately after applying the second adhesive 4, a jig such as a brush is pressed and pulled apart, so that a large number of dents 10 are formed and protrusions 11 are formed as shown in this figure. In addition, although the indentations 10 and the protrusions 11 are regularly arranged in FIGS. 2 and 3, it is not necessary to be regular as in these figures, and a large number of indentations 10 and protrusions 11 are present. It may be formed irregularly.

When the reinforcing material is not provided when the first adhesive 3 is applied, the reinforcing material (not shown) may be adhered to the back surface 2a of the main text 2 when the second adhesive 4 is applied. .. Examples of the reinforcing material include various conventionally known materials already exemplified. For example, the second adhesive 4 can be applied in two steps, and the reinforcing material can be adhered to the coated surface immediately after the first application, and then the second application can be performed. After that, the coated surface of the second adhesive 4 can be formed in an uneven shape by using the jig. Further, in this step, if necessary, one end of the bookmark may be adhered to the second adhesive 4 to provide the bookmark.

Further, in order to form irregularities when the second adhesive 4 is applied, for example, a method is used in which the second adhesive 4 is applied to the back surface of the main body 2 in a comb shape using a comb spatula in parallel with the vertical direction. You may. FIG. 3 shows a state in which the second adhesive 4 is applied to the entire surface of the back surface 2a of the main body 2 in a comb shape parallel to the vertical direction using a comb spatula, and the peaks (protrusions) 12 and the valleys 13 are shown. Are alternately formed in the thickness direction of the text 2. Further, FIG. 4 shows a state in which mountains (protrusions) 12 and 12 are formed on both side edges of the back surface 2a of the main text 2. If possible, the second adhesive 4 contained in the tube may be squeezed out so as to form a plurality of ridges parallel to the above direction.

As the second adhesive 4, various conventionally known adhesives can be used without particular limitation as long as they are adhesives that exhibit high adhesiveness when cured. For example, synthetic resin emulsion-based adhesives, particularly vinyl acetate resin-based emulsion adhesives, ethylene vinyl acetate resin-based emulsion adhesives, acrylic resin-based emulsion adhesives, and adhesives containing copolymers of these components can be mentioned. .. These adhesives also preferably contain 40 to 65% by weight, preferably 45 to 60% by weight, more preferably 45 to 55% by weight of the total amount as a non-volatile component. This is because if it is within such a volatile content range, the adhesive strength after curing is improved and high adhesiveness can be obtained.

Among these, an aqueous emulsion adhesive containing an ethylene vinyl acetate copolymer or a vinyl acetate / acrylic copolymer as a main component, an emulsion adhesive in which these two copolymers coexist, and the like can be particularly preferably used. As these non-volatile components, as the adhesive of the latter 40 to 65, for example, MB Adhesive No. 7KM (manufactured by Hisao Matsumoto Shoten Co., Ltd.) can be particularly preferably used. According to its Material Safety Data Sheet, this adhesive has a content of ethylene vinyl acetate copolymer and vinyl acetate / acrylic copolymer of 53.0% by weight, and isopropyl alcohol (containing) as a trace component. 0.2% by weight) and vinyl acetate (0.3% by weight content) are suspended in water (46.5% by weight content) (the above-mentioned contents are all the total amount of the adhesive). Is 100% by weight.). Included in this adhesive. This adhesive is good to be used as it is at the time of purchase without diluting, and in that respect, it is excellent in coating workability and has a feature of showing high adhesiveness after curing.

Since the viscosity of the second adhesive 4 varies greatly depending on its components and operating environment conditions, it cannot be said unconditionally. For example, in the case of the above-exemplified adhesive, according to the catalog, technical data, etc. presented by the manufacturer, the nominal viscosity (30 ° C.) is described as 8000 mPa · s, so that the viscosity of the second adhesive 8 is approximately. This nominal viscosity seems to be a guide.

The amount of the second adhesive 4 applied varies depending on how the unevenness is formed, so it cannot be said unconditionally, but as a rough guide, it is about 200 to 550 g per 1 m ² , preferably 220. It is better to set it in the range of ~ 500 g, more preferably 230 to 450 g.

Then, the second adhesive 4 is dried and cured. The drying time can be appropriately determined in consideration of work convenience and efficiency, and can be about 1 to 3 hours (preferably 1 to 2.5 hours) as a guide. From the viewpoint of work efficiency, for example, if it is preferable to leave it for a whole day and night, it may be sufficient. As in the case of the first adhesive 2, a conventionally known instrument such as a dryer may be used for drying, or the adhesive may be simply allowed to stand indoors or the like. As a guideline for drying, the uneven surface of the second adhesive 4 may be touched with a finger to be sufficiently hard.

(5) Topcoating Step Subsequently, the third adhesive 5 is applied onto the uneven coating surface of the second adhesive 4. As the third adhesive 5, various cold glue adhesives usually used for attaching the cover can be used without limitation. Such conventionally known cold glue adhesives include synthetic resin emulsion adhesives, particularly vinyl acetate resin emulsion adhesives, ethylene vinyl acetate resin emulsion adhesives, acrylic resin emulsion adhesives, and the like, as well as these components. Adhesives containing a copolymer and the like can be mentioned. Also, glue or the like can be used. Of these, it is preferable to use an adhesive of the same type as the first adhesive 3, that is, an acrylic resin-based emulsion adhesive that exhibits flexibility after curing. Since this adhesive has already been described, it will be omitted here.

The third adhesive 5 is preferably applied over the uneven surface of the second adhesive 4 so that the uneven surface becomes a substantially flat surface. Therefore, the coating amount of the third adhesive 5 is relatively larger than the coating amount of the undercoat and the intermediate coat. As a rough guideline for the coating amount of the third adhesive 5, it is set in the range of about 300 to 600 g, preferably 310 to 550 g, and more preferably 320 to 500 g per 1 m ² .

When the third adhesive is dried, it is visually recognized that the coated surface is slightly hardened, and the adhesive becomes sticky to the touch. If this guideline drying time has passed, the adhesion with the spine cover 7 may not be sufficient when attaching the cover in the next step. If the covers 6 to 8 described later are attached before the guideline drying time, As the spine cover 7 is adhered, the adhesive 5 wraps around the throat of the normal book binding, which affects the spreadability.

(6) Cover attachment step After the coated surface of the third adhesive 5 is dried based on the above guideline, the covers 6 to 8 are attached to the spine of the text 2 for one volume. When a stack of multiple books is stacked, the front cover (back cover) 6, spine cover 7, and back cover (cover) 8 are integrated after separating each bundle from the bundle of multiple books. Attach the so-called wrapped cover (6 to 8). Here, as the cover, various conventionally known papers usually used for thread binding and normal bookbinding can be used. Specifically, coated printing paper such as art paper, coated paper, and lightweight coated paper; special printing paper such as high-quality color paper can be used. There is no particular limitation on the amount of rice basis weight on the cover, and for example, one in the range of 80 to 300 g / m ² can be used. The case cover may be provided with streaks at these boundaries so as to partition the front cover (back cover) 6, spine cover 7, and back cover (cover) 8.

Subsequently, the inner surface of the spine cover 7 of the cover (6 to 8) is adhered to the back cover 2a of the main body 2 and then dried. When the back cover is incorporated into the thread binding and normal bookbinding to be bound, if necessary, the front cover 6 and the back cover 8 and the back cover paper are adhered to each other and dried. At that time, only the edge portion or the entire surface can be adhered to the front cover (back cover) 6 and the back cover (front cover) 8 according to a conventionally known method. The drying time of these adhesives can be appropriately determined in consideration of work convenience and efficiency, and as a guide, refer to about 1 to 3 hours (preferably 1 to 2.5 hours) or more. Can be. From the viewpoint of work efficiency, for example, if it is preferable to leave it for a whole day and night, it does not matter. After that, the top, ground, and edges of the obtained normal bookbinding 1 are finished and cut to complete the bookbinding of the thread binding normal bookbinding as shown in FIG.

As described above, in the bookbinding method of thread binding and bookbinding of the present invention, by forming the topcoat in an uneven shape, the book is opened approximately 180 ° without showing the thread bound spine of the text as in the Codex dressing. It becomes a state, and it becomes possible to bind a book with thread binding and bookbinding having excellent spreadability. Further, by using the first adhesive which exhibits flexibility after curing as the third adhesive, it is possible to bind a book with thread binding and which has more excellent spreadability. Furthermore, in return, by using a paper having a paper density larger than that of the front cover, even if several pages at the beginning or end of the obtained thread binding parallel binding are opened, the front cover or back cover does not try to close, and is approximately 180. ° Since it remains open, it is possible to improve the spreadability.

The bookbinding method for thread binding and bookbinding of the present invention can be applied to binding various thread binding and bookbinding such as books such as paperback books and books, photo books, notebooks, and dictionaries. Further, the thickness of normal bookbinding is not particularly limited, and it can be applied from books and the like up to about 300 sheets to dictionaries and the like with about 1500 pages.

In the above description, the embodiment of the bookbinding method for thread binding and bookbinding of the present invention has been described by taking thread binding and parallel binding using a case cover as an example, but the present invention is not limited to this example. For example, the present invention can be applied to bookbinding of upper binding using a vinyl cover or a French cover. In addition, since it is presumed that there are not a few needs for codex binding, it is also possible to wrap the undercoat and the intermediate coat, which have been hardened with the above-mentioned undercoat and intermediate coat, with a small fold cover to form a codex bookbinding.

Next, the bookbinding method of the thread binding and bookbinding of the present invention will be described in more detail by way of examples.
(Example 1)
The A5 size soft cover book was bound as follows. For the text, 100 sheets of high-quality paper (70 g / m ² ), which is 3 mm larger than the A5 version, are folded in half, and the signatures (216 mm x 152 mm) are collated and bound by the usual method. Obtained by In this text, the thickness of the thread-stitched spine was slightly larger than that of the central region and the fore edge, so the spine was pressed in the heat direction to level the spine.

The text of this one volume is stacked for five volumes (bundle for multiple volumes), fixed so as not to shift, and then first adhered to the entire back surface (216 mm x 57 mm (thickness)) of the bundle for the multiple volumes. The agent was primed in layers. As the first adhesive, a product manufactured by Hisao Matsumoto Shoten Co., Ltd., trade name: MB Adhesive 22-686 (acrylic copolymer emulsion adhesive) was used as it was (undiluted solution). Since 3 g of the adhesive was used on the coated surface of the bundle of 5 books, the amount of the first adhesive applied was calculated to be 244 g per 1 m ² . The drying time of the first adhesive was 1 hour.

After the drying time has elapsed, after confirming that the adhesive does not adhere to the finger even if the surface of the adhesive layer is touched with a finger, the second adhesive is placed on the entire surface of the first adhesive-coated surface. It was painted and the surface was formed uneven using a brush. The adhesive used was manufactured by Hisao Matsumoto Shoten Co., Ltd., trade name: MB Adhesive No. 7KM (Vinyl Acetate / Acrylic Copolymer, Ethylene / Vinyl Acetate Copolymer Aqueous Emulsion Adhesive). The undiluted solution) was used as it was. The amount of the second adhesive used is 244 g / m ² per 1 m ² in calculation because 3 g of the adhesive is used for the coated surface. Then, the bundles of a plurality of volumes were left to stand for about 3 hours to dry-cure the second adhesive.

Further, the first adhesive was overcoated as a third adhesive on the entire surface to which the second adhesive was applied. Since 4 g of the adhesive was used on the coated surface of the bundle of 5 books, the amount of the first adhesive applied was calculated to be 325 g per 1 m ² . After drying for about 1 hour, the adhesive layer on the spine 2a was separated from each bundle of the text 2 for one volume, and the spine covers 7 of the covers 6 to 8 were attached to the back cover 2a of each bundle and dried and cured for an appropriate time. .. The cover paper used was coated paper (manufactured by Oji Materia, trade name OK card +), and the measured value of the paper density was 233 g / m ² . After that, the finishing was further cut off, and the binding of the A5 version thread binding and the bookbinding was completed. The spreadability was confirmed by repeatedly opening any page in the text of the thread binding and normal binding thus obtained. As a result, it was confirmed that the left and right pages open approximately 180 degrees no matter where they are opened, and thus have excellent spreadability.

(Example 2)
Thread binding and normal binding were bound in the same manner as in Example 1 except that two double-folded paperbacks were provided so as to sandwich the text 2. The backing paper used was a white paperboard (manufactured by Oji Materia, trade name Sundia N) with a paper density of 550 g / m ² , and any page in the text of the thread binding and normal binding thus obtained was opened. The spreadability was confirmed. As a result, it was confirmed that the left and right pages open approximately 180 degrees no matter where they are opened, and thus have excellent spreadability. In addition, even when the first few pages were opened, the left and right pages were maintained in a state of being opened by approximately 180 ° with the cover open, and further improvement in spreadability was observed. From this, it was found that it is effective for the spreadability to provide a back cover with a larger paper density than the cover.

(Example 3)
The signature of India paper (rice basis weight 33 g / m ² ), which is a dictionary paper, was sewn together to obtain a 1000-page B5 deformed size (182 x 125 mm) dictionary text. The size of the coated surface is 182 mm x 45 mm. An adhesive of the same type as in Example 1 was used on the back of this text, and the adhesive was applied as follows.
a) Undercoat: 2.1 g was applied to the coated surface (256 g / m ² ) and dried for about 1 hour.
b) Intermediate coating: After 2.1 g was applied to the undercoat surface (256 g / m ² ), irregularities were formed on the surface using a brush and dried for about 3 hours.
c) Topcoat: 3.1 g (379 g / m ² ) was applied to the uneven surface of the intermediate coat, and the mixture was dried for about 1 hour. After that, the text was wrapped with a vinyl cover, which is often used in dictionaries, and dried all day and night.
We repeatedly opened arbitrary pages for the dictionary obtained in this way, and confirmed the spreadability. As a result, it was confirmed that no matter where it was opened, it opened approximately 180 ° and had excellent spreadability.

1 Thread binding and normal binding 2 Body 2a Back surface 3 First adhesive layer 4 Second adhesive layer 5 Third adhesive layer 6 Front cover (back cover)
7 Back cover 8 Back cover (cover)
10 dents 11 protrusions 12 peaks (protrusions)
13 valley

Claims (9)

A text binding process that binds the text of one book obtained by collating a folded printed book or a blank sheet of paper with a thread.
An undercoating step of applying a first adhesive that will show flexibility after curing on the back of the text,
An intermediate coating step in which the second adhesive is provided unevenly on the entire surface of the first adhesive coating surface and dried.
A top coating step of further applying a third adhesive layer to the entire surface of the uneven coating surface of the second adhesive, and a top coating step.
The cover attachment process of adhering the cover to the text and
A bookbinding method for thread binding and normal bookbinding, which comprises. The first aspect of the present invention includes a back-folding incorporating step in which two double-folded paperbacks are provided so as to align each fold with the spine of the one-volume text and sandwich the one-volume text after the text binding step. The bookbinding method of the described thread binding and bookbinding. The bookbinding method for thread binding and bookbinding according to claim 2, wherein the back cover has a paper density higher than that of the cover. The bookbinding method for thread binding and bookbinding according to any one of claims 1 to 3, wherein the first adhesive is an acrylic resin emulsion adhesive. The thread binding and binding according to any one of claims 1 to 4, wherein the second adhesive is an aqueous emulsion adhesive containing an ethylene vinyl acetate copolymer or a vinyl acetate / acrylic copolymer as a main component. Bookbinding method. The invention according to any one of claims 1 to 5, wherein a strip-shaped reinforcing material is pressed against the coated surface immediately after the application of the first adhesive or the second adhesive to bond the strip-shaped reinforcing material to the back. Bookbinding method of thread binding and bookbinding. In the top coating step, after the third adhesive is applied, a plurality of protrusions and dents are formed on the entire surface of the surface to provide unevenness, or the third adhesive is applied parallel to the top and bottom directions of the text. The bookbinding method for thread binding and bookbinding according to any one of claims 1 to 6, wherein the coating is applied so as to provide a comb. The bookbinding method for thread binding and bookbinding according to any one of claims 1 to 7, wherein the first adhesive is used as the third adhesive. The bookbinding method for thread binding and normal binding according to any one of claims 1 to 8, wherein the cover is a wrapped cover.