JP2024017638A - pocket book - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a notebook.

Thread binding and perfect binding are known as binding processes during bookbinding. In the case of thread-stitch binding, the spines of the stacked sheets are bound with thread, adhesive is applied to the spines to secure the base, and then Japanese paper and cheesecloth are pasted with adhesive to secure the spines. will be held. On the other hand, in the case of perfect binding, a hot melt adhesive for bookbinding is applied to the spines of the stacked sheets, thereby binding the spines of the stacked sheets and completing the stiffening of the spines.

EVA hot melt adhesives and PUR hot melt adhesives are known as bookbinding hot melt adhesives. EVA is an abbreviation for Ethylene Vinyl Acetate. PUR is an abbreviation for Poly Urethane Reactive. For example, Examples 1 and 2 of Patent Document 1 listed below include examples of using a PUR hot melt adhesive, and Comparative Examples 1 and 2 of Patent Document 1 listed below include examples of using an EVA hot melt adhesive. are listed.

JP2020-32718A

The inventors of the present invention have been studying techniques that can improve the spreadability of a notebook. However, each of the above-mentioned conventional techniques leaves room for improvement.
Specifically, in the case of the above-mentioned thread binding, the areas where Japanese paper and cheesecloth are pasted (hereinafter also simply referred to as pasted areas) are the areas where Japanese paper and cheesecloth are not pasted (hereinafter also simply referred to as non- pasted areas). ), the bending rigidity is correspondingly higher. Therefore, the spreadability of the notebook may be adversely affected.

Moreover, when Japanese paper and cheesecloth are laminated, a step is created at the boundary between the pasted area and the non- pasted area by the thickness of the Japanese paper and cheesecloth. Therefore, if the cover paper is relatively thin and soft, the above-mentioned step may be transferred to the cover paper side, which may adversely affect the appearance of the notebook. Furthermore, when the level difference as described above is formed, there is a problem that folds are likely to be formed on the cover sheet using the level difference as a boundary.

On the other hand, in the case of the above-mentioned perfect binding, the spreadability is worse than the above-mentioned thread binding. In this regard, according to Patent Document 1, when a PUR hot melt adhesive is used, the spreadability is better than when an EVA hot melt adhesive is used. However, even when PUR-based hot melt adhesives are used, it is not easy to achieve double-page spread performance at the level of thread binding.

In one aspect of the present disclosure, it is desirable to provide a technique that can improve the spreadability of a notebook more than conventional products.

One aspect of the present disclosure is a notebook that includes a main body, a bottom stiffening section, a back stiffening section, and a cover section. The main body has a plurality of unit structures stacked one on top of the other, with a sheet or a folded sheet formed by folding sheets as unit structures, and the plurality of unit structures are stacked on top of each other at a position on the back side of the notebook. It is said to be bound with overlocking. The base hardening part is composed of a cured product of an aqueous emulsion adhesive containing polyvinyl acetate as a main component, and is applied to the stitched portions of the body part to base the body part. The backing part is made of a cured synthetic rubber hot-melt adhesive containing a styrene thermoplastic elastomer as a main component, and is applied to the bottom-packed area to back-stiffen the main body part. The cover part has a first planar part, a second planar part, and a third planar part arranged in succession in this order, and the first planar part constitutes the front cover of the notebook, and the second planar part constitutes the notebook. The third surface portion constitutes the back cover of the notebook.

According to the notebook configured in this way, the main body has a structure in which a plurality of unit structures are bound together by stitching. Furthermore, the back stiffening section is made of a cured product of a synthetic rubber hot melt adhesive containing a styrene thermoplastic elastomer as a main component. Therefore, compared to the conventional thread binding structure in which Japanese paper and cheesecloth are glued together with adhesive, or the perfect binding structure in which PUR hot melt adhesive or EVA hot melt adhesive is used, the backing part can be flexibly deformed. becomes. As a result, the spreadability of the notebook can be made better than that of conventional products.

Hot melt adhesives for bookbinding (PUR hot melt adhesives and EVA hot melt adhesives) used in perfect binding include adhesives that can maintain the strength of the spine by themselves after being cured. Strength and toughness are required. Therefore, the cured product does not have as low hardness, low rigidity, and high flexibility as the synthetic rubber hot melt adhesive used in the notebook of the present disclosure, and PUR hot melt adhesive and EVA hot melt adhesive As long as this is adopted, it is difficult to make the spreadability as good as the notebook of the present disclosure.

In this regard, the notebook of the present disclosure has a structure in which a plurality of unit structures are bound together by stitching, so that the strength of the spine is guaranteed to some extent by this stitching structure. Therefore, in the case of the notebook of the present disclosure, the stiffening part does not require as much toughness as in the case of perfect binding, and therefore, the above-mentioned synthetic rubber-based hot melt adhesive can be used.

If the back stiffening section is constructed from a cured product of such a synthetic rubber-based hot melt adhesive, the back stiffening section can be constructed without providing a reinforcing material such as Japanese paper or cheesecloth. In other words, in addition to the cured synthetic rubber hot melt adhesive that constitutes the back stiffening section, there is a material between the second surface portion and the bottom stiffening section that can reinforce the stitched parts by threading in the main body section. The structure may be such that there is no reinforcing material.

Further, from the viewpoint of taking advantage of the characteristics of the highly flexible back stiffening section employed in the notebook of the present disclosure, it is preferable that the bottom stiffening section and the second surface portion of the cover section are also flexibly deformed. That is, in one aspect of the present disclosure, the lower stiffening section, the back stiffening section, and the second surface section have flexibility to the extent that they can be deformed by following the displacement of the plurality of unit structures when the notebook is opened. May have.

Further, in one aspect of the present disclosure, the backing portion may have self-adhesive properties that are removable and readhesive. As a result, for example, due to an excessive force acting in the direction of separating the main body part and the cover part, the gap between the cover part and the back stiffening part or between the back stiffening part and the bottom stiffening part may be caused. Even if it peels off, if the cause of the peeling is resolved afterwards, the peeled area will re-adhese. Therefore, it is possible to prevent the back cover of the notebook from floating away from the main body side.

Further, in one aspect of the present disclosure, the plurality of unit structures may include a plurality of signatures, each of which corresponds to a folded sheet. Further, front endpapers and back endpapers may be provided that are stacked at positions sandwiching a plurality of signatures from both sides in the stacking direction. The first planar portion may be attached to the front endpaper, and the third planar portion may be attached to the back endpaper.

FIG. 1A is a perspective view of the notebook seen from the upper left front. FIG. 1B is a perspective view of the notebook seen from the lower right rear side. FIG. 2 is a schematic diagram showing the general structure of the main body part, the lower stiffening part, the back stiffening part, and the cover part.

Next, the above-mentioned notebook will be described by citing exemplary embodiments.
[Notebook composition]
As shown in FIGS. 1A, 1B, and 2, the notebook 1 includes a main body part 3, a bottom stiffening part 5, a back stiffening part 7, and a cover part 9. The main body part 3 has a structure in which a plurality of unit structures are laminated, and the plurality of unit structures are bound by stitching at a position on the back side of the notebook 1 (the left end in the figure). . In the case of this embodiment, the plurality of unit structures include a plurality of (11 folds in this embodiment) signatures 11, as shown in FIG.

The signature 11 is a laminated structure (in the present disclosure) in which the original sheet is folded into eight (that is, by repeating the double-folding three times), and eight sheets of text paper for 16 pages are folded. This corresponds to an example of a sheet folded body. Predetermined content is printed on each of the plurality of signatures 11 in advance, and the plurality of signatures 11 are collated so as to be lined up in a predetermined order necessary for constructing the notebook 1.

Front endpapers 13 and back endpapers 15 are stacked at positions sandwiching the plurality of signatures 11 from both sides in the stacking direction. The front endpaper 13 and the back endpaper 15 are structures obtained by folding the original sheet in half. In the case of this embodiment, after the plurality of signatures 11 are bound by stitching (however, the threads are not shown), the front endpaper 13 is glued to the signature 11 with adhesive 17A, and the back endface 15 is glued with adhesive 17A. 17B to the signature 11.

The lower hardening part 5 is constituted by a cured product of an aqueous emulsion adhesive containing polyvinyl acetate as a main component. The lower hardening part 5 is coated on the part of the main body part 3 that is bound by stitching, and lowers the main body part 3.

The backing part 7 is constituted by a cured product of a synthetic rubber hot melt adhesive containing a styrene thermoplastic elastomer as a main component. The back hardening part 7 is applied to the bottom hardened area to harden the back of the main body part 3. When the stiffened back part 7 is formed, the back of the notebook 1 is reinforced, and it is possible to suppress 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 binding structure, the back stiffening part 7 was generally constructed by pasting Japanese paper and cheesecloth, but in this embodiment, styrene-based thermoplastic was used instead of Japanese paper and cheesecloth. A synthetic rubber-based hot melt adhesive containing a plastic elastomer as a main component is applied. The average thickness of the back stiffening section 7 is made thicker than the average thickness of the lower stiffening section 5, and the ratio of the two is about 6:4.

The cover section 9 has a first planar section 21, a second planar section 22, and a third planar section 23 arranged in series in this order, the first planar section 21 forming the front cover of the notebook 1, and the first planar section 21 forming the front cover of the notebook 1. The two-sided part 22 constitutes the back cover of the notebook 1, and the third plane part 23 constitutes the back cover of the notebook 1. The above-described front endpaper 13 is adhered to the first planar portion 21 of the cover portion 9 with an adhesive 17C, and the back endpaper 15 is adhered to the third planar portion 23 of the cover portion 9 with an adhesive 17D.

[Details of synthetic rubber hot melt adhesive]
Next, the synthetic rubber hot melt adhesive constituting the backing part 7 will be explained in more detail. The synthetic rubber hot melt adhesive referred to in this embodiment is a composition containing a styrene thermoplastic elastomer as the main synthetic rubber, and further containing a tackifying resin, a plasticizer, and the like. The styrene thermoplastic elastomer that is the main component of synthetic rubber hot melt adhesives is not particularly limited, but typical examples include SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-butadiene block copolymer), Examples include isoprene-styrene block copolymer), SEBS (styrene-ethylene/butylene-styrene block copolymer), and SEPS (styrene-ethylene/propylene-styrene block copolymer).

Such synthetic rubber hot-melt adhesives are melted by heating and applied, and then the coated material is cooled and cured, resulting in a cured product with extremely low hardness and high flexibility. . In addition, the cured product has excellent self-adhesiveness (that is, tackiness), and due to its self-adhesiveness, it becomes a cured product that is removable and readhesive. If the back stiffening part 7 is made of such a cured material with low hardness and high flexibility, the bending rigidity around the back stiffening part 7 can be lowered compared to the case where Japanese paper and cheesecloth are pasted. The spreadability of No. 1 can be improved.

In addition, in the conventional thread binding structure, Japanese paper and cheesecloth are pasted in an area that protrudes from both ends of the spine and wraps around to the front cover side and back cover side (that is, the area that has a U-shaped cross section). On the front cover side and the back cover side, a step is created by the thickness of the Japanese paper and cheesecloth at the boundary between the area where the Japanese paper and cheesecloth are pasted and the area where the cheesecloth is not pasted. Therefore, if the cover section 9 is made of relatively thin and soft paper, the above-mentioned step may be transferred to the cover section 9, which may adversely affect the appearance of the notebook 1. Further, when the level difference as described above is formed, there is a problem that folds are likely to be formed in the paper forming the cover section 9 with the level difference as a boundary.

In this regard, in the case of the present embodiment, the back hardening part 7 is coated on the back side of the main body part 3, and the cured product can be configured so as not to protrude significantly toward the front cover side and the back cover side. Moreover, as mentioned above, the cured material constituting the back stiffening section 7 has extremely low hardness and high flexibility, so even if the cured material constituting the back stiffening section 7 slightly protrudes toward the front cover side and the back cover side, However, hard steps that would cause the shape to be transferred to the paper forming the cover portion 9 do not occur. Therefore, if such a stepped portion does not occur, a crease will not be formed in the cover portion 9 using such a portion as a boundary.

Furthermore, in the case of this embodiment, the hot melt adhesive constituting the backing part 7 is a synthetic rubber hot melt adhesive containing a styrene thermoplastic elastomer as a main component. Therefore, unlike the PUR hot melt adhesive or EVA hot melt adhesive used in conventional perfect binding, it is possible to form a back stiffening part 7 that is much more flexible. The spreadability of No. 1 is improved.

Hot melt adhesives for bookbinding used in perfect binding are required to have adhesive strength and toughness such that the cured product alone can maintain the strength of the spine after it becomes a cured product. Therefore, it is difficult to obtain a cured product with lower hardness, lower rigidity, and higher flexibility than synthetic rubber-based hot melt adhesives, and as long as PUR-based hot melt adhesives and EVA-based hot melt adhesives are used, It is difficult to make the spreadability as good as the notebook 1 of this embodiment.

In this regard, the present embodiment is based on the premise that the plurality of signatures 11 are bound together by stitching, so that the stitching structure ensures the strength of the spine to some extent. Therefore, in the case of this embodiment, the hot melt adhesive constituting the backing part 7 is not required to have as much adhesive strength and toughness as in the case of perfect binding. Melt adhesive can be used. Thereby, the back stiffening section 7 can be constructed without providing reinforcing materials such as Japanese paper and cheesecloth.

In addition, in this embodiment, the lower stiffening section 5, the back stiffening section 7, and the second planar section 22 are flexible enough to be deformable following the displacement of the plurality of signatures 11 when the notebook 1 is opened. have sex. Therefore, for example, unlike the case where the second planar portion 22 is provided with a hard back cover that hardly curves, the flexibility of the back stiffening portion 7 can be utilized to improve the spreadability of the notebook 1.

Furthermore, in the notebook 1 of this embodiment, the backing part 7 has self-adhesive properties that allow it to be re-peelable and re-adhesive. Therefore, for example, due to an excessive force acting in the direction of separating the main body part 3 and the cover part 9, the gap between the cover part 9 and the back stiffening part 7 or between the back stiffening part 7 and the bottom stiffening part 5 may occur. Even if the two peel off between the two, if the cause of the peeling is subsequently resolved, the peeled area will re-adhese. Therefore, it is possible to prevent the spine of the notebook 1 from floating away from the main body 3 side.

[effect]
As explained above, according to the above-mentioned notebook 1, the main body part 3 is bound by thread stitching, and the back stiffening part 7 is made of a cured synthetic rubber-based hot melt adhesive containing styrene-based thermoplastic elastomer as a main component. Configured. Thereby, the spreadability of the notebook 1 can be improved more than that of conventional products.

[Manufacturing method of notebook]
Next, a method of manufacturing the notebook 1 will be explained.
First, in the folding process, the 11-fold signature 11 described above is created. Each of the sheets that form the 11-fold signature 11 has printing equivalent to 16 pages of the body of the notebook (=8 sheets x 2 front and back sides). By folding this sheet into eight, one signature 11 is created. The contents of each page are printed on the sheet so that when the sheet is folded into eight, the orientation and order of each page are correct. Subsequently, in the collating process, the eleven-fold signatures 11 are stacked in a predetermined order with their orientations aligned.

Subsequently, in the thread binding step, the signatures 11 collated in the previous collating step are bound by thread stitching. Subsequently, in the endpaper pasting step, front endpapers 13 and back endpapers 15 are pasted at positions sandwiching the plurality of signatures 11 from both sides in the stacking direction. Note that the front endpaper 13 and the back endpaper 15 may be bound together with the plurality of signatures 11 by stitching. Furthermore, the front facing 13 and the back facing 15 may be omitted.

Subsequently, in the under-stacking step, a water-based emulsion adhesive containing polyvinyl acetate as a main component is applied to the plurality of signatures 11 that have been stitched and bound. The specific coating method is not limited, but to give an example, the object to be coated is held with a clamp and moved along a conveyance path, and a roller placed in the middle of the conveyance path applies water-based coating to the object to be coated. Apply emulsion adhesive. In this case, for example, the object to be coated moves along a horizontal conveyance path with its back side facing downward, and during the movement, it comes into contact with the outer peripheral surface of a roller placed below the conveyance path. , as long as it can be coated with a water-based emulsion adhesive.

After the water-based emulsion adhesive is 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 a heating wire or the like, high frequency heating using microwaves or the like, combustion heating using gas or oil, etc. may be used, and two or more of these may be used in combination. In addition to heating, air drying using a blower may be performed.

In the case of this embodiment, the under-hardening machine used in the under-hardening process is configured to perform drying by combustion heating using a burner, and then perform additional drying by high-frequency heating. In this bottom hardening machine, the drying process using a burner is designed on the premise that Japanese paper for back hardening will be pasted in the next step. When pasting Japanese paper, the lower hardening part 5 does not necessarily need to be highly dry; in fact, it may be more convenient for pasting Japanese paper to be in a slightly semi-dry state.

On the other hand, in the case of this embodiment, Japanese paper is not pasted in the post-priming process. Therefore, if the bottom compacting section 5 is not sufficiently dry, when the semi-finished products that have finished the bottom compacting process are piled up on the stacker, blocking will occur and the semi-finished products will stick together, reducing work efficiency. This could be a factor. Therefore, in this embodiment, additional drying is performed using high-frequency heating to highly dry the bottom hardening section 5, thereby suppressing the occurrence of blocking in the semi-finished product after the bottom hardening.

When the cured product of the water-based emulsion adhesive is formed, the front endpaper 13 and the back endpaper 15 are in a condition where they are primed together with the plurality of signatures 11. When such a bottom stiffening section 5 is formed, the plurality of signatures 11 are temporarily fixed by the bottom stiffening section 5. As a result, it is possible to suppress the occurrence of loosening or unraveling in the threaded portion during the bookbinding process, and also to suppress the generation of gaps between the signatures 11 located at adjacent positions.

Subsequently, in the back-hardening process, the structure that has been bottom-hardened is targeted for coating. The specific coating method for the back hardening section 7 is not limited either, but to give an example, as in the case of bottom hardening, the object to be coated is held with a clamp and moved along the conveyance path, and then the object is conveyed. The synthetic rubber-based hot melt adhesive may be applied to the object to be coated using a roller disposed in the middle of the path. In this case, for example, the object to be coated moves along a horizontal conveyance path with its back side facing down, and during the movement, it comes into contact with the outer peripheral surface of a roller placed below the conveyance path. , a synthetic rubber hot melt adhesive may be applied.

Subsequently, in a cover pasting step, the cover portion 9 is pasted to the front endpaper 13 and the back endpaper 15. Thereafter, in the cutting process, the desired notebook 1 can be obtained by cutting the notebook 1 on three sides other than the spine. In the cutting process, lubricant is applied to the cutting blade periodically or irregularly. In this embodiment, silicone oil is used as the lubricant. As a result, even the self-adhesive backing part 7 can be cut smoothly, and the synthetic rubber hot melt adhesive that makes up the backing part 7 is prevented from adhering to the cutting blade. can do.

[Other embodiments]
Although the notebook has been described above by citing exemplary embodiments, the above-mentioned embodiments are merely exemplified as one aspect of the present disclosure. That is, the present disclosure is not limited to the exemplary embodiments described above, and can be implemented in various forms without departing from the technical idea of the present disclosure.

For example, in the above embodiment, an example was shown in which the main body part 3 is constructed by laminating a plurality of unit structures using a signature, which is a folded sheet body, as a unit structure. The unit structure is not limited to a folded sheet. For example, the main body portion may be constructed by stacking a plurality of sheets using an unfolded sheet as a unit structure. Alternatively, the main body portion may be constructed by laminating sheets and folded sheets in a mixed manner.

Further, in the above embodiment, the sheets are folded into eight to form a signature, but the number of folds when forming a signature is not limited to eight, and can be folded in two, in four, or in eight. It may be a folded sheet with a large number of folds, or a mixture of sheets with different numbers of folds.

Note that a plurality of functions realized by one component illustrated in the above embodiment may be realized by a plurality of components. One function realized by one component illustrated in the above embodiment may be realized by a plurality of components. The plurality of functions realized by the plurality of components illustrated in the above embodiments may be realized by one component. One function realized by the plurality of components illustrated in the above embodiment may be realized by one component. A part of the configuration illustrated in the above embodiment may be omitted. Among the embodiments described above, at least a part of the configurations exemplified in one embodiment may be added to or replaced with the configurations exemplified in any of the above embodiments other than the one embodiment.

[Technical idea disclosed in this specification]
[Item 1]
It is a notebook,
A plurality of unit structures are stacked, with a sheet or a folded sheet formed by folding sheets being stacked as a unit structure, and the plurality of unit structures are stacked by threading at a position on the back side of the notebook. A main body portion having a bound structure;
a base hardening part that is made of a cured product of an aqueous emulsion adhesive containing polyvinyl acetate as a main component, and is applied to the stitched portions of the main body to solidify the main body;
a backing part that is made of a cured product of a synthetic rubber hot melt adhesive containing a styrene thermoplastic elastomer as a main component, and is applied to the bottom-hardened area to back-stiffen the main body part;
A first planar portion, a second planar portion, and a third planar portion are arranged in succession in this order, the first planar portion constitutes the front cover of the notebook, and the second planar portion constitutes the notebook. a cover part that constitutes the back cover of the notebook, and the third surface part constitutes the back cover of the notebook;
A notebook with.

[Item 2]
The notebook described in item 1,
In addition to the cured synthetic rubber hot-melt adhesive constituting the back-stamping section, there is a material between the second surface portion and the bottom stiffening section bound by the thread stitching in the main body section. The structure is such that there is no reinforcing material that can reinforce the parts.
pocket book.

[Item 3]
The notebook described in item 1 or item 2,
The lower stiffening part, the back stiffening part, and the second planar part have flexibility to the extent that they can be deformed to follow the displacement of the plurality of unit structures when the notebook is opened.
pocket book.

[Item 4]
A notebook described in any one of items 1 to 3,
The backing part has removable and readhesive self-adhesiveness,
pocket book.

[Item 5]
A notebook described in any one of items 1 to 4,
The plurality of unit structures include a plurality of signatures each corresponding to the sheet folded body, and further,
comprising a front facing and a back facing that are stacked at positions sandwiching the plurality of 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.

1...Notebook, 3...Main part, 5...Bottom hardening part, 7...Back hardening part, 9...Cover part, 11...Signature, 13...Front cover, 15...Back cover, 17A, 17B, 17C, 17D...Adhesion agent, 21...first planar part, 22...second planar part, 23...third planar part.

Claims (5)

It is a notebook,
A plurality of unit structures are stacked, with a sheet or a folded sheet formed by folding sheets being stacked as a unit structure, and the plurality of unit structures are stacked by threading at a position on the back side of the notebook. A main body portion having a bound structure;
a base hardening part that is made of a cured product of an aqueous emulsion adhesive containing polyvinyl acetate as a main component, and is applied to the stitched portions of the main body to solidify the main body;
a backing part that is made of a cured product of a synthetic rubber hot melt adhesive containing a styrene thermoplastic elastomer as a main component, and is applied to the bottom-hardened area to back-stiffen the main body;
A first planar portion, a second planar portion, and a third planar portion are arranged in succession in this order, the first planar portion constitutes the front cover of the notebook, and the second planar portion constitutes the notebook. a cover part that constitutes the back cover of the notebook, and the third surface part constitutes the back cover of the notebook;
A notebook with. The notebook according to claim 1,
In addition to the cured synthetic rubber hot-melt adhesive constituting the back-stamping section, there is a material between the second surface portion and the bottom stiffening section bound by the thread stitching in the main body section. The structure is such that there is no reinforcing material that can reinforce the parts.
pocket book. The notebook according to claim 1 or claim 2,
The lower stiffening part, the back stiffening part, and the second planar part have flexibility to the extent that they can be deformed to follow the displacement of the plurality of unit structures when the notebook is opened.
pocket book. The notebook according to claim 1 or claim 2,
The backing part has removable and readhesive self-adhesiveness,
pocket book. The notebook according to claim 1 or claim 2,
The plurality of unit structures include a plurality of signatures each corresponding to the sheet folded body, and further,
comprising front and back endpapers stacked at positions sandwiching the plurality of 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.