pocket book

Abstract

To provide a technology capable of improving a spread property of a pocket book more than a conventional article.SOLUTION: A pocket book has a body part, a lower hardening part, a back hardening part and a cover part. The body part is formed as a structure of binding a plurality of unit structures by a yarn sewer by laminating the plurality of unit structures with a sheet or a sheet folding-back body constituted by folding back the sheet as a unit structure. The lower hardening part is constituted by a hardened object of an aqueous emulsion adhesive of including polyvinyl acetate as a main component, and is coated on a place bound by the yarn sewer in the body part, and hardens the lower part of the body part. The back hardening part is constituted by a hardened object of a synthetic rubber type hot melt adhesive of including a styrene type thermoplastic elastomer as a main component, and is coated on a lower hardened place, and hardens the back of the body part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This disclosure relates to a notebook.

Background Art

[0002] As binding processes during bookbinding, thread-sewing and perfect binding are known. In the case of thread-sewing, the spine of the stacked sheets is sewn with thread, an adhesive is applied to the spine for underfixing, and further, Japanese paper and cold gauze are pasted with an adhesive for spine reinforcement. On the other hand, in the case of perfect binding, a hot melt adhesive for bookbinding is applied to the spine of the stacked sheets, whereby the spine of the stacked sheets is bound and the spine reinforcement is also completed.

[0003] As hot melt adhesives for bookbinding, EVA-based hot melt adhesives and PUR-based hot melt adhesives are known. EVA is an abbreviation of Ethylene Vinyl Acetate. PUR is an abbreviation of Poly Urethane Reactive. For example, in Examples 1 and 2 of Patent Document 1 below, examples of the use of PUR-based hot melt adhesives are given, and in Comparative Examples 1 and 2 of Patent Document 1 below, examples of the use of EVA-based hot melt adhesives are given.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventors of the present invention have repeatedly studied technologies that can improve the book-opening property of a notebook. However, there is still room for improvement in the conventional technologies as described above. Specifically, in the case of the thread-stitched binding described above, the areas where washi paper and gauze are attached (hereinafter simply referred to as "attached areas") have considerably higher bending rigidity than the areas where washi paper and gauze are not attached (hereinafter simply referred to as "unattached areas"). Therefore, this can negatively affect the notebook's ability to open flat.

[0006] Furthermore, when washi paper and gauze are laminated, a step is created at the boundary between the laminated and unlaminated areas, equal to the thickness of the washi paper and gauze. Therefore, if the cover paper is relatively thin and soft, the aforementioned step may be transferred to the cover paper, negatively affecting the appearance of the notebook. In addition, when such a step is formed, problems such as creases easily forming in the cover paper along the boundary of the step occur.

[0007] On the other hand, in the case of perfect binding, the ability to open the book is worse than that of thread-stitched binding. In this regard, according to Patent Document 1, it is stated that using a PUR-based hot-melt adhesive results in better opening ability than using an EVA-based hot-melt adhesive. However, even when using a PUR-based hot-melt adhesive, it is not easy to achieve the same level of opening ability as thread-stitched binding.

[0008] In one aspect of this disclosure, it is desirable to provide a technology that can improve the unfolding of the notebook beyond that of conventional products. [Means for solving the problem]

[0009] One aspect of the present disclosure is a notebook comprising a main body, a bottom reinforcement part, a spine reinforcement part, and a cover part. The main body is constructed by laminating multiple unit structures, with sheets or folded sheet bodies formed by folding sheets as unit structures, and the multiple unit structures are bound together by thread stitching at the position that will be the spine of the notebook. The bottom reinforcement part is made of a cured product of an aqueous emulsion adhesive mainly containing polyvinyl acetate, and is applied to the areas of the main body that are bound by thread stitching to reinforce the main body. The spine reinforcement part is made of a cured product of a synthetic rubber-based hot melt adhesive mainly containing styrene-based thermoplastic elastomer, and is applied to the areas that have been reinforced to reinforce the spine of the main body. The cover section consists of a first surface section, a second surface section, and a third surface section arranged in that order, with the first surface section forming the front cover of the notebook, the second surface section forming the spine of the notebook, and the third surface section forming the back cover of the notebook.

[0010] In this type of notebook, the main body is constructed by binding multiple unit structures together with thread. Furthermore, the spine reinforcement is made of a cured synthetic rubber-based hot-melt adhesive containing styrene-based thermoplastic elastomer as the main component. Therefore, compared to conventional thread-stitched binding structures where Japanese paper and gauze are bonded together with adhesive, or perfect binding structures using PUR-based or EVA-based hot-melt adhesives, the spine reinforcement can be deformed more flexibly. This makes it possible to open the notebook more smoothly than conventional products.

[0011] Hot-melt adhesives used in perfect binding (such as PUR-based hot-melt adhesives and EVA-based hot-melt adhesives) require adhesive strength and toughness after curing to maintain the spine's strength on their own. Therefore, the cured product does not have the low hardness, low rigidity, and high flexibility of the synthetic rubber-based hot-melt adhesive used in the notebook disclosed herein. As long as PUR-based or EVA-based hot-melt adhesives are used, it is difficult to achieve the same level of openability as the notebook disclosed herein.

[0012] In this regard, the notebook disclosed herein has a structure in which multiple unit structures are bound together by thread stitching, and this thread stitching structure ensures a certain degree of strength in the spine. Therefore, in the case of the notebook disclosed herein, the toughness required for the spine reinforcement is not as high as in the case of perfect binding, and thus, the aforementioned synthetic rubber-based hot melt adhesive can be used.

[0013] If the back reinforcement section is constructed using the cured product of such a synthetic rubber-based hot melt adhesive, the back reinforcement section can be constructed without providing reinforcing materials such as Japanese paper and cheesecloth. In other words, the structure between the second planar section and the lower reinforcement section may be such that there are no reinforcing materials other than the cured product of the synthetic rubber-based hot melt adhesive that constitutes the back reinforcement section, which can reinforce the parts of the main body that are bound together by stitching.

[0014] Furthermore, from the perspective of taking advantage of the highly flexible spine reinforcement adopted in the notebook of this disclosure, it is desirable that the second planar portion of the bottom reinforcement and cover portion also be flexibly deformable. That is, in one embodiment of this disclosure, the bottom reinforcement, spine reinforcement, and second planar portion may have a degree of flexibility that allows them to deform in accordance with the displacement of multiple unit structures when the notebook is opened.

[0015] Furthermore, in one aspect of this disclosure, the spine reinforcement portion may have self-adhesive properties that allow it to be peeled off and re-adhered. This means that, for example, if excessive force is applied in a direction that separates the main body portion and the cover portion, causing the cover portion and the spine reinforcement portion or the spine reinforcement portion and the bottom reinforcement portion to separate, the separated areas will re-adhere once the cause of the separation is resolved. Therefore, it is possible to prevent the spine of the notebook from lifting away from the main body portion.

[0016] Furthermore, in one aspect of this disclosure, a plurality of unit structures may include a plurality of signatures, each corresponding to a folded sheet. In addition, a front endpaper and a back endpaper may be provided, which are laminated in positions that sandwich the plurality of signatures from both sides in the lamination direction. The first planar portion may be attached to the front endpaper, and the third planar portion may be attached to the back endpaper. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1A is a perspective view of the notebook from the upper left front. Figure 1B is a perspective view of the notebook from the lower right rear. [Figure 2] Figure 2 is a schematic diagram showing the general structure of the main body, bottom reinforcement section, spine reinforcement section, and cover section. [Modes for carrying out the invention]

[0018] Next, the above-mentioned notebook will be described with reference to an exemplary embodiment. [Planner structure] As shown in Figures 1A, 1B, and 2, the notebook 1 comprises a main body 3, a bottom reinforcement 5, a spine reinforcement 7, and a cover 9. The main body 3 is constructed by stacking multiple unit structures, and at the spine side of the notebook 1 (the left end in the figures), the multiple unit structures are bound together by thread stitching. In this embodiment, the multiple unit structures include multiple (11 folds in this embodiment) folded signatures 11, as shown in Figure 2.

[0019] Each signature 11 is a laminated structure (corresponding to an example of a folded sheet structure as referred to in this disclosure) in which the original sheet is folded into eight (i.e., folded in half three times), resulting in eight sheets of paper (16 pages) of text being folded together. Each of the multiple signatures 11 has predetermined content printed on it in advance, and the multiple signatures 11 are collated in a predetermined order necessary to constitute the notebook 1.

[0020] A front endpaper 13 and a back endpaper 15 are laminated at the positions where multiple folded signatures 11 are sandwiched from both sides in the stacking direction. The front endpaper 13 and the back endpaper 15 are structures made by folding the original sheet in half. In this embodiment, after the multiple folded signatures 11 are bound together by thread stitching (though the thread is not shown), the front endpaper 13 is bonded to the folded signatures 11 with adhesive 17A, and the back endpaper 15 is bonded to the folded signatures 11 with adhesive 17B.

[0021] The lower reinforcing part 5 is composed of a cured product of an aqueous emulsion adhesive containing polyvinyl acetate as a main component. The lower reinforcing part 5 is applied to the portion stitched by the thread in the main body part 3 to reinforce the main body part 3 at the bottom.

[0022] The back reinforcing part 7 is composed of a cured product of a synthetic rubber-based hot melt adhesive containing a styrene-based thermoplastic elastomer as a main component. The back reinforcing part 7 is applied to the portion that has been reinforced at the bottom to reinforce the back of the main body part 3. When the back reinforcing part 7 is formed, the back of the notebook 1 is reinforced, and it is possible to prevent the back of the notebook 1 from cracking due to the force applied when opening and closing the notebook 1. In the case of the conventional thread stitching structure, as the back reinforcing part 7, it was common to paste Japanese paper and organdy, but in this embodiment, instead of Japanese paper and organdy, a synthetic rubber-based hot melt adhesive containing a styrene-based thermoplastic elastomer as a main component is applied. The average thickness of the back reinforcing part 7 is made thicker than the average thickness of the lower reinforcing part 5, and the ratio between the two is about 6:4.

[0023] The cover part 9 has the first planar part 21, the second planar part 22, and the third planar part 23 connected in this order. The first planar part 21 constitutes the front cover of the notebook 1, the second planar part 22 constitutes the spine cover of the notebook 1, and the third planar part 23 constitutes the back cover of the notebook 1. The aforementioned front lining 13 is adhered to the first planar part 21 of the cover part 9 by the adhesive 17C, and the back lining 15 is adhered to the third planar part 23 of the cover part 9 by the adhesive 17D.

[0024] [Details of the synthetic rubber-based hot melt adhesive] Next, the synthetic rubber-based hot melt adhesive that constitutes the backing portion 7 will be described in more detail. The synthetic rubber-based hot melt adhesive in this embodiment is a composition that contains a styrene-based thermoplastic elastomer as the main component of synthetic rubber, and further contains a tackifying resin and a plasticizer. The styrene-based thermoplastic elastomer that is the main component of the synthetic rubber-based hot melt adhesive is not particularly limited, but typical examples include SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (styrene-ethylene-butylene-styrene block copolymer), SEPS (styrene-ethylene-propylene-styrene block copolymer), and so on.

[0025] Such synthetic rubber-based hot-melt adhesives, after being melted by heating and applied, harden when the applied material cools, resulting in a cured product with extremely low hardness and high flexibility. Furthermore, the cured product possesses excellent self-adhesion (i.e., tackiness), and due to this self-adhesion, it becomes a cured product that can be peeled off and re-adhered. If the spine reinforcement portion 7 is constructed from such a low-hardness, high-flexibility cured product, the bending rigidity around the spine reinforcement portion 7 can be reduced compared to when Japanese paper and cheesecloth are attached, thereby improving the opening ability of the notebook 1.

[0026] Furthermore, in conventional thread-stitched binding, the washi paper and gauze are attached to the area that extends beyond both ends of the spine and wraps around to the front and back covers (i.e., the area that forms a U-shape in cross-section). A step is created at the boundary between the areas where the washi paper and gauze are attached and the areas where they are not, due to the thickness of the washi paper and gauze. Therefore, if the cover section 9 is made of relatively thin and soft paper, the aforementioned step may be transferred to the cover section 9, negatively affecting the appearance of the notebook 1. Moreover, when such a step is formed, problems such as creases easily forming in the paper that makes up the cover section 9, with the area with the step as the boundary, arise.

[0027] In this respect, in this embodiment, the spine reinforcement portion 7 is coated on the spine side of the main body portion 3, and the cured material can be configured so as not to protrude significantly onto the front cover side and back cover side. Moreover, as described above, the cured material constituting the spine reinforcement portion 7 is extremely low hardness and highly flexible, so even if the cured material constituting the spine reinforcement portion 7 protrudes slightly onto the front cover side and back cover side, it will not create a hard step that would transfer its shape onto the paper forming the cover portion 9. Therefore, if no such step is created, no creases will be formed on the cover portion 9 with such areas as boundaries.

[0028] Furthermore, in this embodiment, the hot-melt adhesive constituting the spine reinforcement portion 7 is a synthetic rubber-based hot-melt adhesive mainly composed of styrene-based thermoplastic elastomer. Therefore, unlike the PUR-based and EVA-based hot-melt adhesives used in conventional perfect-bound books, it is possible to form a spine reinforcement portion 7 that is far more flexible, thereby improving the ability of the notebook 1 to open.

[0029] Hot-melt adhesives used in perfect binding require adhesive strength and toughness such that the cured material alone can maintain the strength of the spine. Therefore, it is difficult to obtain a cured material that is as low hardness, low rigidity, and high flexibility as synthetic rubber-based hot-melt adhesives, and as long as PUR-based or EVA-based hot-melt adhesives are used, it is difficult to achieve the same level of openability as in the notebook 1 of this embodiment.

[0030] In this embodiment, since it is assumed that multiple folded sections 11 are bound together by thread stitching, the strength of the spine is guaranteed to a certain extent by the thread stitching structure. Therefore, in this embodiment, the hot melt adhesive constituting the spine reinforcement section 7 does not require the same level of adhesive strength and toughness as in the case of perfect binding, and thus a low-hardness, high-flexibility synthetic rubber-based hot melt adhesive can be used. As a result, the spine reinforcement section 7 can be constructed without providing reinforcing materials such as Japanese paper and cheesecloth.

[0031] Furthermore, in this embodiment, the lower reinforcing portion 5, the spine reinforcing portion 7, and the second planar portion 22 have enough flexibility to deform in accordance with the displacement of the multiple folded signatures 11 when the notebook 1 is opened. Therefore, unlike, for example, a case in which the second planar portion 22 is a rigid spine that hardly curves, the flexibility of the spine reinforcing portion 7 can be utilized to improve the openability of the notebook 1.

[0032] Furthermore, in the notebook 1 of this embodiment, the spine reinforcement portion 7 has self-adhesive properties that allow it to be peeled off and reattached. Therefore, even if, for example, excessive force is applied in a direction that separates the main body portion 3 and the cover portion 9, causing the cover portion 9 and the spine reinforcement portion 7, or the spine reinforcement portion 7 and the bottom reinforcement portion 5, the peeled areas will reattach once the cause of the peeling is resolved. Thus, it is possible to prevent the spine of the notebook 1 from lifting away from the main body portion 3.

[0033] [effect] As explained above, in the notebook 1 described above, the main body 3 is bound with thread stitching, and the spine reinforcement part 7 is made of a cured product of a synthetic rubber-based hot melt adhesive mainly composed of styrene-based thermoplastic elastomer. This makes it possible to improve the opening of the notebook 1 to a greater extent than conventional products.

[0034] [How to manufacture a notebook] Next, the manufacturing method of the notebook 1 described above will be explained. First, in the folding process, the 11-fold signatures 11 described above are created. Each sheet that forms the basis of the 11-fold signatures 11 has printing equivalent to 16 pages of the main text of the notebook (= 8 sheets × 2 sides). By folding this sheet into eight, one signature 11 is created. The sheet has the content of each page printed on it so that when the sheet is folded into eight, the orientation and order of each page are correct. Next, in the collating process, the 11-fold signatures 11 are stacked in a predetermined order with their orientations aligned.

[0035] Next, in the thread binding process, the folded signatures 11 that were collated in the previous collating process are bound together by thread stitching. Subsequently, in the endpaper pasting process, the front endpapers 13 and back endpapers 15 are pasted to positions that sandwich the multiple folded signatures 11 from both sides in the stacking direction. The front endpapers 13 and back endpapers 15 may also be bound together with the multiple folded signatures 11 by thread stitching. The front endpapers 13 and back endpapers 15 may also be omitted.

[0036] Next, in the base hardening process, a water-based emulsion adhesive containing polyvinyl acetate as the main component is applied to the multiple folded signatures 11 that have been sewn together. The specific application method is not limited, but one example is to hold the object to be coated with a clamp and move it along a transport path, and apply the water-based emulsion adhesive to the object using a roller placed along the transport path. In this case, for example, the object to be coated should move along a horizontal transport path with its back facing downwards, and during that movement, it should come into contact with the outer surface of a roller placed below the transport path, thereby applying the water-based emulsion adhesive.

[0037] After the water-based emulsion adhesive has been applied, the coating film is heated and dried to form a cured product of the water-based emulsion adhesive. The heating method is not particularly limited, but for example, resistance heating using an electric heating wire, high-frequency heating using microwaves, or combustion heating using gas or oil may be used, and two or more of these may be combined. In addition to heating, air drying using a blower may also be performed.

[0038] In this embodiment, the base hardening machine used in the base hardening process is configured to perform drying by combustion heating using a burner, and then to perform additional drying by high-frequency heating. In this base hardening machine, the drying process using a burner is designed on the premise that washi paper for back hardening will be applied in the next process. When washi paper is applied, the base hardened section 5 does not necessarily need to be highly dry; in fact, it may be more advantageous for the washi paper to be slightly semi-dry.

[0039] In contrast, in this embodiment, washi paper is not applied in the post-base hardening process. Therefore, if the base hardening section 5 is not sufficiently dry, when the semi-finished products that have completed the base hardening process are piled up on the stacker, blocking may occur, causing the semi-finished products to stick together, which can reduce work efficiency. To address this, in this embodiment, additional drying is performed by high-frequency heating to thoroughly dry the base hardening section 5, thereby suppressing the occurrence of blocking in the semi-finished products after base hardening.

[0040] Once the water-based emulsion adhesive has cured, the front endpaper 13 and back endpaper 15 are fixed in place along with the multiple folded signatures 11. When this fixed section 5 is formed, the multiple folded signatures 11 are temporarily fixed in place by the fixed section 5. This prevents loosening or unraveling of the stitching during the bookbinding process and prevents gaps from forming between adjacent folded signatures 11.

[0041] Next, in the back-solidification process, the structure that has been partially solidified becomes the target for coating. While the specific coating method for the back-solidification section 7 is not limited, one example is that, similar to the partial solidification process, the object to be coated is held with a clamp and moved along a transport path, and a synthetic rubber-based hot-melt adhesive is applied to the object using a roller positioned along the transport path. In this case, for example, the object to be coated moves along a horizontal transport path with its back facing downwards, and during this movement, it comes into contact with the outer surface of a roller positioned below the transport path, thereby applying the synthetic rubber-based hot-melt adhesive.

[0042] Next, in the cover-attaching process, the cover portion 9 is attached to the front endpaper 13 and the back endpaper 15. After that, in the cutting process, the three sides of the notebook 1, excluding the spine portion, are cut to obtain the desired notebook 1. In the cutting process, a lubricant is applied to the cutting blade periodically or irregularly. In this embodiment, silicone oil is used as the lubricant. This allows even the self-adhesive spine reinforcement portion 7 to be cut smoothly, and prevents the synthetic rubber-based hot-melt adhesive constituting the spine reinforcement portion 7 from adhering to the cutting blade.

[0043] [Other embodiments] Although the notebook has been described above with reference to exemplary embodiments, the embodiments described above are merely illustrative examples of one aspect of this disclosure. In other words, this disclosure is not limited to the exemplary embodiments described above, and can be implemented in various forms without departing from the technical idea of ​​this disclosure.

[0044] For example, in the above embodiment, an example was shown in which a folded sheet is used as a unit structure and a plurality of unit structures are stacked to form the main body 3. However, the unit structures stacked to form the main body are not limited to folded sheets. For example, an unfolded sheet may be used as a unit structure and a plurality of sheets may be stacked to form the main body. Alternatively, a mixture of sheets and folded sheets may be stacked to form the main body.

[0045] Furthermore, in the above embodiment, the sheet was folded into eight sections to form the signature, but the number of folds when forming the signature is not limited to eight. Signatures may be folded in half, quarters, or even more than eight, and signatures with different numbers of folds may be mixed together.

[0046] Furthermore, multiple functions realized by one component as exemplified in the above embodiment may be realized by multiple components. One function realized by one component as exemplified in the above embodiment may be realized by multiple components. Multiple functions realized by multiple components as exemplified in the above embodiment may be realized by one component. One function realized by multiple components as exemplified in the above embodiment may be realized by one component. Some of the configurations exemplified in the above embodiment may be omitted. At least a part of the configuration exemplified in one of the above embodiments may be added to or replaced with the configuration exemplified in the other embodiments.

[0047] [Technical concepts disclosed in this specification] [Item 1] It is a notebook, The main body is constructed such that a sheet or a sheet stack made by folding sheets is used as a unit structure, and multiple unit structures are stacked on top of each other, with the multiple unit structures being bound together by thread at the position that will be the back of the notebook, It is composed of a cured aqueous emulsion adhesive mainly containing polyvinyl acetate, and is applied to the parts of the main body that are stitched together by the thread stitching to form a base hardening portion, It is composed of a cured product of a synthetic rubber-based hot melt adhesive mainly containing a styrene-based thermoplastic elastomer, and is applied to the base-hardened area to harden the main body, and A cover portion comprising a first planar portion, a second planar portion, and a third planar portion arranged in that order, wherein the first planar portion constitutes the front cover of the notebook, the second planar portion constitutes the spine of the notebook, and the third planar portion constitutes the back cover of the notebook, A notebook equipped with [features / equipment].

[0048] [Item 2] The notebook described in item 1, Between the second planar portion and the lower hardening portion, there is no reinforcing material other than the cured synthetic rubber-based hot melt adhesive that constitutes the back hardening portion, and no reinforcing material that can reinforce the portion of the main body that is bound by the stitching. pocket book.

[0049] [Item 3] A notebook as described in item 1 or item 2, The lower reinforcement portion, the back reinforcement portion, and the second planar portion have a degree of flexibility that allows them to deform in accordance with the displacement of the plurality of unit structures when the notebook is opened. pocket book.

[0050] [Item 4] A notebook described in any one of items 1 through 3, The aforementioned backing portion has self-adhesive properties that allow it to be peeled off and reattached. pocket book.

[0051] [Item 5] A notebook described in any one of items 1 through 4, Each of the aforementioned multiple unit structures contains multiple folded signatures, each corresponding to the aforementioned folded sheet weight, and further, The system includes a front endpaper and a back endpaper that are stacked in positions that sandwich the aforementioned multiple signatures from both sides in the stacking direction, The first planar portion is attached to the front endpaper, and the third planar portion is attached to the back endpaper. pocket book. [Explanation of Symbols]

[0052] 1...Notebook, 3...Main body, 5...Bottom reinforcement, 7...Spine reinforcement, 9...Cover, 11...Folded signature, 13...Front endpaper, 15...Back endpaper, 17A, 17B, 17C, 17D...Adhesive, 21...First surface, 22...Second surface, 23...Third surface.

Claims

1. It is a notebook, The main body is constructed such that a sheet or a sheet stack made by folding sheets is used as a unit structure, and multiple unit structures are stacked on top of each other, with the multiple unit structures being bound together by thread at the position that will be the back of the notebook, It is composed of a cured aqueous emulsion adhesive mainly containing polyvinyl acetate, and is applied to the parts of the main body that are stitched together by the thread stitching to form a base hardening portion, It is composed of a cured product of a synthetic rubber-based hot melt adhesive mainly containing a styrene-based thermoplastic elastomer, and is applied to the base-hardened area to harden the main body, and A cover portion comprising a first planar portion, a second planar portion, and a third planar portion arranged in that order, wherein the first planar portion constitutes the front cover of the notebook, the second planar portion constitutes the spine of the notebook, and the third planar portion constitutes the back cover of the notebook, A notebook equipped with [features / equipment].

2. A notebook according to claim 1, Between the second planar portion and the lower hardening portion, there is no reinforcing material other than the cured synthetic rubber-based hot melt adhesive that constitutes the back hardening portion, and no reinforcing material that can reinforce the portion of the main body that is bound by the stitching. pocket book.

3. A notebook according to claim 1 or claim 2, The lower reinforcement portion, the back reinforcement portion, and the second planar portion have a degree of flexibility that allows them to deform in accordance with the displacement of the plurality of unit structures when the notebook is opened. pocket book.

4. A notebook according to claim 1 or claim 2, The aforementioned backing portion has self-adhesive properties that allow it to be peeled off and reattached. pocket book.

5. A notebook according to claim 1 or claim 2, Each of the aforementioned multiple unit structures contains multiple folded signatures, each corresponding to the aforementioned folded sheet weight, and further, The system includes a front endpaper and a back endpaper that are stacked in positions that sandwich the aforementioned multiple signatures from both sides in the stacking direction, The first planar portion is attached to the front endpaper, and the third planar portion is attached to the back endpaper. pocket book.

Images