Books and book manufacturing methods

Abstract

To provide a book that has a good spread property even though it has a round spine and has a high original form maintaining capability.SOLUTION: A round spine book 1 with a spine 2 formed in a curved surface includes: multiple signatures; a main body 10 that includes end leaves 11, 12 that are positioned so as to sandwich the signatures; and a front cover 21 and a back cover 22 that are bonded to the end leaves 11, 12. The spine 2 includes: a first adhesive agent layer 15 formed on the main body 10 ; and a crepe paper layer 30 formed on the first adhesive agent layer 15, the first adhesive agent layer 15 being comprised of polyurethane reactive hot melt adhesive agent.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to bound articles, books, and methods for manufacturing them. [Background technology]

[0002] Unlike ordinary books, bound books such as notebooks, diaries, and schedule books are written in relatively frequently. When a notebook or other book in an open state tries to close due to its restoring force, it becomes difficult to write in the book. Therefore, it is easier to use these bound books if they can be kept open without having to be held by hand.

[0003] Several bookbinding structures that make it easy to keep the book open have been proposed. Patent Document 1 discloses a codex-bound book that has good openability and a method for manufacturing the same. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-105056 Summary of the Invention [Problem to be solved by the invention]

[0005] The book described in Patent Document 1 is a codex-bound booklet, meaning it has a square spine. Planners and other similar items often have rounded spines, or "rounded spines," to create a more luxurious appearance. Planners and other similar items are often replaced every year or every few years, and used ones are often kept rather than thrown away, so a consistent appearance is often required. Therefore, the technology described in Patent Document 1 cannot be applied to such cases.

[0006] Another problem with the booklet described in Patent Document 1 is that it has a weak ability to retain its shape when it is rounded. In other words, repeated opening can destroy the bond at the spine, causing it to lose its roundness and some of the signatures to pop out. Some notebooks and the like are used for long periods of time, such as 5 to 10 years, and are opened much more frequently than ordinary books, etc. In such usage patterns, the above-mentioned possibility becomes even higher.

[0007] To provide a book that has a round spine but is easy to open and has a high ability to retain its original shape at the spine. [Means for solving the problem]

[0008] A first aspect of the present invention is a round-backed book having a body including a plurality of signatures and endpapers arranged to sandwich the signatures, a front cover and a back cover joined to the endpapers, and a curved spine. In this book, the front and back covers are separate. The spine has a first adhesive layer formed on the main body and a crepe paper layer formed on the first adhesive layer, and the first adhesive layer is formed of a polyurethane-based reactive hot melt adhesive.

[0009] A second aspect of the present invention is a method for manufacturing a round-spine book having a body including a plurality of signatures and endpapers arranged to sandwich the signatures, and a front cover and a back cover joined to the endpapers. In this book, the front and back covers are separate. This method includes step A of applying a polyurethane-based reactive hot melt adhesive to the spine of a bound body, which is formed by bonding a front cover and a back cover to the endpaper that sandwiches multiple folded sections; step B of bonding crepe paper so as to cover the polyurethane-based reactive hot melt adhesive; step C of cutting three sides of the bound body; and step D of applying heat to the spine and then squeezing the bound body with a backing machine to give the spine a rounded shape. [Effects of the Invention]

[0010] According to the present invention, a book can be provided that has a round spine but is easy to open and has a high ability to retain its original shape at the spine. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing a book according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing the book in an open state. [Figure 3] 10A to 10C are diagrams showing a process in the manufacture of the book. [Figure 4] 10A to 10C are diagrams showing a process in the manufacture of the book. [Figure 5] 10A to 10C are diagrams showing a process in the manufacture of the book. [Figure 6] 10A to 10C are diagrams showing a process in the manufacture of the book. [Figure 7] 10A to 10C are diagrams showing a process in the manufacture of the book. [Figure 8] 10A to 10C are diagrams showing a process in the manufacture of the book. [Figure 9] FIG. 10 shows the completed book. [Figure 10] FIG. 2 is a schematic cross-sectional view of the spine of the book. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention will be described with reference to FIGS. Fig. 1 is a diagram showing a book 1 according to this embodiment. Book 1 has a main body 10 including multiple pages on which text, images, etc. are printed, a front cover 21 and a back cover 22 arranged to sandwich main body 10, and a string-like bookmark 6. Main body 10 has multiple quires, each having multiple pages, and front and back endpapers arranged to sandwich the multiple quires. Front cover 21 and back cover 22 are joined to the front and back endpapers, respectively. Book 1 is a "round-back" book with a curved spine, and the center of main body 10 in the thickness direction (the direction in which the pages are stacked) is slightly displaced toward the spine.

[0013] Figure 2 shows the book 1 in an open state. Although the book 1 has a round spine, its restoring force prevents it from closing, and it can be kept open without being pressed down by hand. This is due to the layer structure of the spine of the book 1, which will be described in more detail later.

[0014] An example of a method for manufacturing the book 1 according to this embodiment will be described. First, multiple signatures are stacked, and the endpapers, folded in half, are placed between the multiple signatures. Then, a cover 21 and a back cover 22 are attached to the front and back endpapers, respectively. The binding process is then carried out. Various known binding methods can be used, such as sewn binding, thread binding, and perfect binding. There are no restrictions on how the front cover 21 and back cover 22 are joined to the endpapers, and they may be joined entirely or partially. If only partially joined, they may be joined at the "gutter" (described later) or a certain area from the fore-edge, which is the opposite side of the spine. When the binding process is completed, a bound body including the main body is completed. That is, the bound body according to this embodiment already has a front cover and a back cover. At this point, the bound body has a square spine.

[0015] Next, as shown in Figure 3, a line of hot melt adhesive or emulsion bond (hereinafter referred to as "hot melt adhesive, etc. Hm") is applied to the binding body 100. The application position is the area of ​​the front cover 21 and back cover 22 near the spine, also referred to as the "gutter." The hot melt adhesive, etc. Hm is applied so as to extend in the longitudinal direction of the spine 2.

[0016] Next, as shown in Figure 4, a polyurethane-based reactive hot melt adhesive (PUR) is applied to the spine 2 of the binding body 100 (Step A). ​​PUR has the property that after it cools and solidifies once applied, it further hardens by chemically reacting with moisture in the air or paper. Unlike typical hot melt adhesives, PUR does not remelt even when heated after solidification, but it can be temporarily softened by applying hot air or contacting a high-temperature member.

[0017] Next, as shown in Figure 5, strips of crepe paper 3 are attached to the spine 2 coated with PUR (Step B). The crepe paper is wrinkled paper that is flexible in the direction of smoothing out the wrinkles. The width of the crepe paper 3 is greater than that of the spine 2, and is preferably approximately the width of the spine 2 plus the width of the hot melt adhesive, etc., Hm, applied to the front and back surfaces. The crepe paper 3 is first bonded to the PUR at its middle widthwise portion, and then both widthwise ends are folded toward the front cover 21 and back cover 22 and bonded to the hot melt adhesive Hm or the like.

[0018] Next, the three sides except for the spine 2 are cut to separate the signature into individual pages (step C). Next, as shown in Figure 6, a bookmark 6 is attached to the part of the crepe paper 3 that is joined to the spine 2. There are no particular restrictions on the method for attaching the bookmark 6, and various adhesives such as cold glue and emulsion bond can be used. It is preferable to tuck the attached bookmark inside the main body 10 so that it does not interfere with subsequent processes. The bookmark 6 is not an essential component, so the book 1 does not have to include the bookmark 6.

[0019] Next, heat is applied to the spine 2 of the bound body 100 with the bookmark 6 attached to temporarily soften the PUR, and the spine 2 is then squeezed with a backing machine to give it a rounded shape (Step D). The heating temperature is set to a temperature above the softening point of the PUR, but not so high that it will burn the crepe paper. For example, if the softening point is 160°C, the heating temperature can be set to about 300°C. Even at this temperature, the crepe paper will not burn if heated for a short period of time. By step C, the bound body 100 has a round spine.

[0020] 7, a second adhesive 4 is applied to the portion of the crepe paper 3 that is joined to the spine 2. Glue is suitable as the second adhesive 4 from the viewpoints of hardness upon hardening and ease of removal when it splatters, but this is not limiting, and the above-mentioned PUR, cold glue, emulsion bond, etc. can also be used.

[0021] Next, as shown in Figure 8, a strip of covering paper 5 is placed on the spine 2. After that, the covering paper 5 is pressed against the layer of second adhesive 4 on the spine 2 with a sponge or the like, and attached to the spine 2 (Step D). The covering paper 5 is preferably slightly narrower than the crepe paper 3 and extends beyond the spine 2 so as not to overlap the front cover 21 or back cover 22, but it may extend slightly, or the extending portion may be attached to the front cover 21 or back cover 22 in the same way as the crepe paper 3. Crepe paper is suitable as the covering paper 5, but other paper materials, cloth backed with Japanese paper or the like, or vinyl or urethane sheets can also be used.

[0022] Through the above steps, book 1 according to this embodiment is completed as shown in Figure 9. In the manufacturing method of this embodiment, the front and back covers are already attached to the binding body, so there is no need to attach the front and back covers after three-side cutting, and the process ends at step D. Steps A to D can be performed continuously by machine, so the manufacturing method according to this embodiment can efficiently mass-produce round-spine books that have good page-spreading properties. If the completed book 1 is a diary or the like, it may be covered with a vinyl cover or the like, or if the book is a novel or other written work, it may be distributed as is by applying desired printing or embossing to the front cover 21, back cover 22, and covering paper 5, etc.

[0023] Figure 10 shows a schematic cross-sectional view of the spine 2 of book 1. First, a first adhesive layer 15 made of PUR is formed on the arched body 10, and then a crepe paper layer 30 made of crepe paper 3, a second adhesive layer 40 made of second adhesive 4, and a covering paper layer 50 made of covering paper 5 are layered on top of that in this order. Although a bookmark 6 is not shown in Figure 10, it is fixed between the crepe paper layer 30 and the covering paper layer 50. The front cover 21 and back cover 22 are joined to the endpapers 11 and 12, respectively, which are arranged in a folded state, and a part of the crepe paper layer 30 covers the front cover 21 and back cover 22.

[0024] In the spine 2 of the book 1 having the above structure, the PUR effectively reacts with moisture in the air and moisture in the second adhesive layer 40 that has permeated the crepe paper layer 30, thereby hardening. The laminated structure consisting of the cured first adhesive layer 15, crepe paper layer 30, second adhesive layer 40, and cover paper layer 50 is disposed in the spine of the bound body 100, thereby providing the book 1 with sufficient robustness. As a result, even with frequent opening movements, the rounded spine retains its original shape well, and the bound body structure is less likely to be damaged. In particular, when the bound body 100 is bound with thread, the PUR hardens with the threads embedded in the binding, firmly engaging the two within the first adhesive layer 15, significantly improving the spine's ability to retain its original shape. On the other hand, because the laminated structure has a certain degree of flexibility, it deforms moderately when opened, making it difficult to generate a restoring force that would close the book. As a result, although book 1 does not become completely flat due to its structure, it maintains its open state in an optimal manner.

[0025] If a small crack or the like occurs in first adhesive layer 15 during the opening operation, the crack may start to spread from that point. In the present invention, by covering first adhesive layer 15 with crepe paper 3, the occurrence of cracks in first adhesive layer 15 that could trigger the destruction of the spine is effectively suppressed.

[0026] Furthermore, because both widthwise ends of the crepe paper 3 are bonded to the front cover 21 and back cover 22, the first adhesive layer 15 is completely covered with the crepe paper 3 up to the ends near the front cover 21 and back cover 22. This also effectively prevents the first adhesive layer 15 from peeling off from the main body 10.

[0027] In a structure in which paper covering first adhesive layer 15 is bonded to front cover 21 and back cover 22, if the paper is inflexible, it may tear because it cannot adequately follow the deformation of first adhesive layer 15 during use. If the paper tears, it will not be able to adequately protect first adhesive layer 15 in the torn area, and it will not be possible to prevent the occurrence of cracks that could lead to destruction. The crepe paper 3 used in this embodiment stretches its wrinkled portions, allowing it to fully follow the deformation of the first adhesive layer 15. As a result, it will not tear during use, continues to cover and protect the surface of the first adhesive layer 15, and can suitably suppress the occurrence of cracks that could lead to breakage.

[0028] The inventors conducted a durability test on the book 1 of this embodiment, which has the above-described laminated structure on the spine, by repeating the opening operation 100,000 times. As a result, it was confirmed that the original shape of the spine was well maintained and the open state was also well maintained even after the durability test. The bound body of the book used in this test was bound with thread.

[0029] Although one embodiment of the present invention has been described above, the specific configuration is not limited to this embodiment, and modifications and combinations of the configuration within the scope that does not depart from the gist of the present invention are also included.

[0030] For example, if the book according to the present invention does not have a bookmark, the second adhesive and covering paper may be omitted. The book according to the present invention has sufficient spine retention even without the second adhesive layer and covering paper layer, but providing the second adhesive layer and covering paper layer can further improve the spine retention, so the second adhesive layer and covering paper layer may be provided without a bookmark.

[0031] As for the type of paper for the front and back covers of the present invention, considering that they will be squeezed by a backing machine, it is preferable to use high-density, inexpensive coated paper or the like.

[0032] In the above embodiment, an example was described in which a separate sheet of paper from the quire is arranged as an inside paper, but a part of the quire may be used as an inside paper and the front and back covers may be joined together. In other words, the present invention includes cases in which a part of the quire is an inside paper. [Explanation of symbols]

[0033] 1 book 2 back 3 crepe paper 4 Second adhesive 5 Covered paper 10 Main Unit 11, 12 Endpaper 15 First adhesive layer 21 Cover 22 Back cover 30 crepe paper layers 40 Second adhesive layer 50 Covering paper layer

Claims

1. A book having a round spine, the book comprising: a body including a plurality of signatures and endpapers arranged to sandwich the signatures; a front cover and a back cover joined to the endpapers; and a book having a curved spine, The front cover and the back cover are separate pieces, The back portion is a first adhesive layer formed on the body; a crepe paper layer formed on the first adhesive layer, The first adhesive layer is made of a polyurethane-based reactive hot melt adhesive. Books.

2. a second adhesive layer formed on the crepe paper layer; a coated paper layer formed on the second adhesive layer; Further provided with The book of claim 1.

3. A book having a body including a plurality of quires and endpapers arranged to sandwich the quires, and a front cover and a back cover joined to the endpapers, the spine of which is curved, The back portion is a first adhesive layer formed on the body; a crepe paper layer formed on the first adhesive layer, the first adhesive layer is made of a polyurethane-based reactive hot melt adhesive, A part of the crepe paper constituting the crepe paper layer is located on the front cover and the back cover. Books.

4. A method for manufacturing a round-spine book having a body including a plurality of signatures and endpapers arranged to sandwich the signatures, and a front cover and a back cover joined to the endpapers, comprising: The front cover and the back cover are separate pieces, Step A: applying a polyurethane-based reactive hot melt adhesive to a spine of a bound body formed by bonding the cover and the back cover to the endpapers sandwiching the plurality of signatures; Step B: laminating crepe paper so as to cover the polyurethane-based reactive hot melt adhesive; Step C: cutting three sides of the binding body; Step D: applying heat to the spine and then squeezing the binding body with a backing machine to make the spine round; Equipped with How books are made.

5. In step B, a portion of the crepe paper is bonded to the front cover and the back cover. A method for manufacturing a book according to claim 4.

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