WO2016184655A1

WO2016184655A1 - Method for producing a book block, in particular for a book-like document, insert sheet, and a book block

Info

Publication number: WO2016184655A1
Application number: PCT/EP2016/059485
Authority: WO
Inventors: Olaf Dressel
Original assignee: Bundesddruckerei Gmbh
Priority date: 2015-05-18
Filing date: 2016-04-28
Publication date: 2016-11-24
Also published as: EP3297844A1; EP3297844B1; DE102015107732B4; DE102015107732A1

Abstract

The invention relates to a method for producing a book block (16), in particular for a book-like document (11) and to an insert sheet (15) which has an individual page (27) with an individual page (27) region (35) that has not been thinned and with a thinned region (34) extending up to the region (35) that has not been thinned along a lateral edge (26), wherein a separating zone (46) is introduced into the thinned region such that a crosslinking zone (47) is formed between the separating zone (46) and the lateral edge (26) for connecting to additional insert sheets (15), and a bending zone (48) is formed in the thinned region (34) between the separating zone (46) and the region (35) that has not been thinned.

Description

Verfahren zur Herstellung eines Buchblocks, insbesondere Method for producing a book block, in particular
für ein buchartiges Dokument sowie ein for a book-like document as well
Einlageblatt und ein BuchblockInsert sheet and a book block

The invention relates to a method for producing a book block, in particular for a book-like document and an insert sheet and a book block, which is provided in particular for a book-like document.

From WO 2006/092273 A1 a book-like document, in particular identification document, with a book cover is known, which comprises a data page and a plurality of inner pages, which are interconnected by a common seam and fixed by means of an attachment to the book cover. The insides are made of paper and are sutured together with the data side by a suture to form a seam. Such a fold formation, in which several sides are joined together by a seam in the fold, is limited to a specific number of pages.

Alternatively, it is known to glue a plurality of individual pages at their side edge, so that a so-called block binding takes place. For example, DE 10 2012 108 454 A1 discloses such a block binding for arranging the insides to form a book block. This book block is bound in a book cover, so that a book-like document is made.

The invention has for its object to provide a method for producing a book block and an insert sheet and a book block, in which there are low restoring forces after the impact of individual insert sheets of the book block.

This object is achieved by a method for producing a book block, in which a plurality of insert sheets are formed with a thinned portion, wherein according to a first alternative, the insert sheet consists of a single page, which is compressed in a bordering on a side edge of the single side edge region with a grooving tool and the thinned region is produced, which forms at least one bending zone in relation to an undiluted region of the single side. Alternatively, it is provided that a single side with at least one strip covering the side edge is connected to a composite tool and compressed into an edge region adjoining a side edge of the strip and a thinned region is created which forms at least one bending zone relative to an undiluted region of the single side. In the thinned region of the insert sheet, a separation zone, in particular a bead, is introduced, by means of which the thinned region of the insert sheet is subdivided into the bending zone and a crosslinking zone. On the cross-linking zone of the insert sheets, a potting material is applied and positioned one above the other in a mold, so that the insert sheets are connected in the mold by a spine to a book block. This method of making the book block allows the insert sheets bound in the book block to have the same properties as in a previously known book block bond with respect to the undiluted portion, whereas the thinned portion of the insert sheets, particularly through the connection of the insert sheets through the crosslinking zone, and the embodiment a bending zone and a separation zone by means of the bead a higher flexibility is achieved, which allows easier impact of the individual pages of the insert sheets and simultaneously generates lower restoring forces. Both the bending zone and the separation zone, in particular in a configuration as a bead, serve as a kind of joint, which allows a high bending at a low residual stress, so that low restoring forces after the impact of the individual pages even with a variety of bound to a book block insert sheets given is.

Preferably, several insert sheets are stacked one above the other and then the crosslinking zones of the insert sheets are at least pressurized with a molding tool, so that a material flow of the potting material is produced to form the book spine. By prior application of the potting material to the crosslinking zone of the insert sheets prior to collating into a stack, the material flow of the potting material can be achieved and controlled by stacking two molding dies of the molding tool onto the crosslinking zone of the insert sheets. This simplifies book binding.

Preferably, a material flow of the potting material is produced in the mold, in which the side edges of the insert sheet pointing into the mold are embedded in and surrounded by the potting material. During the merging of the molding dies and the buildup of a pressure on the crosslinking zones, the potting material may flow, so that the end faces of the side edges are also embedded in and surrounded by the potting material, without these being wetted with potting material in a previous application step.

By means of the molding tool, the beads of the individual sides are preferably brought into abutment against one another, so that the molding tool is sealed in the direction of the bending zones emerging from the molding tool in the thinned region by the separation zone. This allows the potting material to flow only within the mold and prevent leakage toward the flexure zone, so that even the flexure zone, and preferably also the parting zone, is unaffected by the potting material.

The mold advantageously acts directly on the mutually opposite end faces of the insert sheets, which adjoin the side edges, so that with increasing pressure, a material flow of the potting material is generated, which is directed in the direction of the side edges. This results in a homogeneous distribution of the potting material between the thinned areas along the crosslinking zone and along the respective end face of the side edges.

Furthermore, the mold is heated to produce the flow of material. As a result, a flow of the potting material and a uniform cross-linking can be promoted. For example, heating cartridges may be provided in the mold. Furthermore, at least one heating wire or microwave-activatable heat sources can be introduced into the crosslinking zone of the insert sheet and heated at least during the production of the material flow through the molding tool. In particular, when using heating wires local heating and networking of the potting material may be provided with the adjacent zones. For example, this can also be a security feature are formed by the heating wires are specifically overheated, so that they partially destroy, which in turn a specific, non-reproducible design is possible.

A further preferred embodiment of the method provides that a sprue layer is applied to the thinned edge region of the insert sheet. As a result, an increase in the bending stress can be achieved and premature breakage of the thinned region during repeated impact can be prevented. Furthermore, the introduction of a separation zone, in particular in the form of a bead, which forms a joint, can thereby be improved.

Furthermore, on an edge region of the undiluted region of the single side of the insert sheet, which adjoins the thinned region, a sprue layer is applied and a bonding zone is formed. As a result, the sprue layer can extend from the thinned area into the undiluted area and thus reduce a notch effect in the transition area from the undiluted to the thinned area due to the change in cross section in order to minimize premature breakage.

The sprue layer applied in the thinned region and the bonding zones is preferably compressed by means of a pressing tool. On the one hand, this results in an at least partial penetration of the sprue layer into the individual sides, and on the other hand, the thinned region of the insert sheet is preferably formed, which extends between the sprue zone up to the side edge.

Furthermore, alternatively, the at least one sprue layer can be compressed by a non-plane-parallel pressing tool. As a result, a sealing compaction of the sprue layer to the bending zone can be generated. Furthermore, a preferred flow direction can be effected toward the spine.

For the sprue layer, a thermoplastic material is preferably used, which is applied in the form of a film as a so-called edge band. Alternatively, this sprue layer can also be sprayed on or applied as a flowable layer.

The potting material for forming the book spine preferably consists of a natural substance or a plastic which is crosslinked at least under pressure, temperature, by chemical auxiliaries or by irradiation, in particular UV or IR irradiation. A variety of potting materials can be used.

For the single page, a printable layer is preferably selected, in particular a paper layer or a layer with paper-like substances.

The object underlying the invention is further achieved by an insert sheet for a book block, which has a single side with an undiluted region and along a side edge a thinned edge region, in which a separation zone is introduced, so that between the separation zone and the side edge of a crosslinking area and a bending zone is formed between the separation zone and the undiluted region of the single zone. Through this embodiment of the insert sheet is created by the separation zone, which may be formed in particular as a bead, and the bending zone, a bendable area, are generated within the small restoring forces upon impact of the individual pages. At least the bending zone generated when striking the individual pages low residual stresses, so that a slight impact of the single page or single pages is possible.

Preferably, a sprue layer is applied to the thinned area and at least partially penetrated. As a result, on the one hand, an increase in the bending stress can be achieved, and on the other hand, an increased strength despite the thinned area, ie in the reduced thickness cross-section, achieved in order to allow a secure bonding of the insert sheet in the book block.

Furthermore, in a border region adjacent to the thinned region, which is provided in the undiluted region of the single side, a bonding zone with the sprue layer is formed. Thereby, the sprue layer extends from the thinned area to the undiluted area, thereby improving the bonding of the single side to the thinned area. Alternatively, the gate layer may extend over the entire undiluted area.

The separation zone introduced into the insert sheet is preferably formed as a bead and has, for example on a leaf side or first outer side raised relative to the bending and crosslinking zone curvature and is in particular on an opposite leaf side or second outer side in the transition region to the bending and crosslinking zone with a formed further survey. On the one hand, the bead can, for example, be formed as a U-shaped bead which rises in a direction opposite to the bending zone and the crosslinking zone. In the transition region from the bead to the crosslinking zone on the one hand and from the bead to the bending zone on the other hand, a further projection or a survey may be provided. This design serves, in particular, for sealing the crosslinking areas relative to one another during the stacking of the insert sheets through the beads and the protrusions protruding in the opposite direction, thereby preventing leakage of a potting material from the molding tool in the direction of the bending zone.

The object underlying the invention is further achieved by a book block with single pages, which comprises a plurality of insert sheets according to one of the above-described embodiments, which are arranged stacked one above the other and connected to a common book spine to a book block.

Preferably, a potting material is applied to the crosslinking zone and provided between the crosslinking zones of the liner sheets and extends from the beads to the side edges of the thinned portion. Preferably, the potting material embeds the side edges, so that a closed spine is formed by the potting material.

Furthermore, in a preferred embodiment of the book block is provided that the thinned portions of the individual pages and the potting material to form the book spine have a thickness which corresponds to the thickness of the superimposed single pages in the undiluted area. The distance between the thinned areas of adjacent insert sheets is thus bridged by the potting material, so that the undiluted areas of the insert sheets can lie flat on one another.

Preferably, the layer thickness of the potting material between two adjacent thinned regions is formed such that the extension plane of the undiluted region and the extension plane of the thinned region lie in a common plane. The height of the bead on the one hand and the height of the opposite elevation on the other hand corresponds to the sum of the thickness of the undiluted region, that is, the thickness of the potting material on each side of the crosslinking zone, the height of the bead on the one hand and the height of the elevation on the other Formation of the spine equals.

Such a book block can be used for an identification document, a passport, a passport, a passbook or the like.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:

FIG. 1 shows a schematic side view of an insert sheet for producing the book block,

FIGS. 2 a, 2 b, 3 to 5 show schematic side views for producing an insert sheet for a book block,

Figures 6 and 7 are schematic side views of process steps for the production of the book block and

Figure 8 is a perspective view of a book-like document with a book block according to the invention.

The production of an insert sheet 15 from a single side 27 will be described with reference to FIGS. 1 to 5, which is preferably used for producing a book block 16 according to FIGS. 6 and 7, in which small restoring forces occur when impacting.

FIG. 1 shows the single side 27 in a side view with a side edge 25, which is subsequently processed on the basis of FIG. 2a or FIG. 2b. As a result, an unprocessed or undiluted region 35 of the single side 27 remains in this process. The single side 27 preferably consists of paper or a paper-like substance.

In a first step, starting from the lateral edge 25, an edge region can be compressed with a pressing tool 30 into the single side 27. Subsequently, according to a first embodiment according to FIG. 2a, a sprue layer 28 is applied to an edge region of the single side 27. This can be a so-called edge band. Alternatively, the sprue layer 28 may be sprayed on or applied as a flowable layer. These two steps can also be done simultaneously.

With a pressing tool 30 consisting of an upper tool 31 and a lower tool 32, the sprue layer 28 and the edge region adjoining the side edge 25 of the single side 27 is compressed with the upper and

lower tool

31, 32. As a result, the sprue layer 28 penetrates at least partially into the interior of the single side 27. The upper and

lower tool

31, 32 is designed such that after the pressing process, a thinned region 34 adjacent to the side edge 26 and a further undiluted region 35 of the single side 27 are formed is. In an edge zone of the undiluted area 35, which adjoins the thinned area 34, a connection zone 36 can be formed within which the sprue layer 28 can increasingly be located. In the upper and

lower tool

31, 32, a pocket may be formed in this respect, so that the attachment zone 36 is increasingly formed with the sprue layer 28.

FIG. 2b shows an alternative embodiment of a first step for forming the insert sheet 15. In this embodiment, an edge region adjoining the side edge 25 of the single side 27, which is to form a thinned region 34, is formed by at least one strip 29, which is provided with a pressing tool 30 or lamination tool is attached to the single side 27, pinned or laminated. This at least one strip 29 is preferably formed as a film or band and consists of a thermoplastic polymer. This at least one strip 29 is preferably formed thinly relative to the single side 27 in order to form the thinned region 34 starting from an end edge 33 of the strip 29 as far as the undiluted region 35. Alternatively, this at least one strip 29 can be reduced in cross-section even when tying or adhering to the single side 27 in order to form the thinned region 34. Preferably, two strips 29 are connected to the single side 27, wherein in each case a strip 29 abuts on an outer side of the single side 27, so that a kind of stapling effect arises. But it is also conceivable only one-sided connection of at least one strip 29. Furthermore, as an alternative, the single side 27 can consist, for example, of two or more layers and at least one strip 29 can be inserted between the at least two layers forming the individual sides 27 and then laminated and / or pressed.

FIG. 3 shows an intermediate product after carrying out the process step according to FIG. 2a or 2b. In the exemplary embodiment according to FIG. 2 a, the sprue layer 28 is penetrated on both sides along the undiluted region 34. Alternatively, the sprue layer 28 may also be only partially penetrated on each side, so that a middle zone remains in the thinned region 34, which is free of the sprue layer 28. By the transition of the sprue layer 28 from the thinned portion 34 in the bonding zone 36 of the undiluted portion 35 a reduced notch effect and thus an increased load capacity and number of bending stresses can be achieved.

The side edge 25 of the single side 27 can be flush with the sprue layer 28, so that a common side edge 26 is formed for the future insert sheet 15. Alternatively, the side edge 25 of the single side 27 can also spring back relative to a side edge of the sprue layer 28, so that the superposed sprue layers 28 lie directly against each other and form the side edge 26.

2b, the at least one side edge 33 of the strip 29 forms the side edge 26 of the future insert sheet 15.

FIG. 4 shows a further process step. In this case, a separating zone 46, in particular in the form of a bead 42, is introduced by a further pressing tool 41 into the thinned region 34. This bead 42 has a raised curvature 43, which rises upwards relative to a leaf side, and lying opposite two elevations 44 are preferably formed. This results in the structure of the insert sheet 15 shown in Figure 5. The bead 42 formed by the pressing tool 41 forms a so-called separation zone 46, wherein from the separation zone 46 in the direction of the side edge 26, a crosslinking zone 47 is formed. Seen in the other direction, a bending zone 48 is formed between the separation zone 46 and the attachment zone 36.

In the embodiment of the bead 42, a deformation is preferably carried out such that the height of the bend 43 lies in the plane of a first outer side 51 of the undiluted region 35 and the elevations 44 extend opposite one another in a plane of a second outer side 52 of the undiluted region 35. The function of the curvature 43 and elevation 44 of the bead 42 will be discussed below with reference to FIG.

The method steps according to FIGS. 1 to 5 can also be produced with a tool in one process step.

Such an insert sheet 15 is preferably used for the production of a book block 16, which allows a slight impact of the individual pages 27.

To form the book block 16, it is provided that prior to stacking several insert sheets 15 congruently one above the other, as shown in Figure 6, first on one or both sides of the crosslinking zone 47, a potting material 54 is applied (Figure 5). This potting material 54 consists of a crosslinkable natural or plastic and is applied along the crosslinking zone 47 to the respective end side of the individual pages.

Subsequently, the insert sheets 15 are stacked one above the other and preferably aligned congruent to the side edge 26. Subsequently, a spine 57 is formed with a mold 56. The molding tool 56 has a receiving space 58, which is open on one side, so that the undiluted regions 34 can be led out of the receiving space 58. In a transition region between an outer end face 59 of the molding tool 56 and a contact surface 61 in the receiving space 58 is on the upper and

lower mold

62, 63 of the mold 56 each have a curvature 43 of the bead 42 corresponding recess 64 and the increase 44 behind engaging projection 65th intended. The contact surface 61 in the receiving space 58 is preferably wider than the crosslinking zone 47, so that between the bottom of the receiving space 58 and the side edges 26 of the insert sheets 15 is still a free space is formed. The molding dies 62, 63 preferably engage directly on the upper and lower end faces of the insert sheet 15 or of the potting material 54 applied to the crosslinking zone 47.

When closing the molding dies 62, 63 of the molding tool 56, the recess 64 engages the bead 42 of the uppermost insert sheet 15. At the same time, the projection 65 engages behind the elevation 64 of the lowermost insert sheet 15, the separation zones 46 being positioned lying on each other during further closing, that is, the elevations 44 of the one bead 42 engage the adjacent curvature 43 of the other bead 42. Consequently, the receiving space 58 of the mold 56 is closed by the recess 64 of the forming die 62 and the projection 65 with the forming die 63 and the intervening beads 62 of the single sheets 15. At the front, the forming dies 62, 63 rest on the end edges of the individual sheets 15, so that pressure is exerted on the pouring material 54 by the contact surfaces 61, which pressure can flow exclusively into the remaining free space. This allows the side edge 26 to be embedded, forming the spine 67. Such an arrangement is shown in FIG.

It is further apparent from FIG. 7 that such an amount of potting material 54 is introduced between the thinned regions 34 that the plane of the crosslinking zone 47 lies in the plane of the undiluted region 35 of the insert sheet 15 so that, on the one hand, the single sides 27 are undiluted relative to the latter Areas 35 are directly adjacent. The spine 57 bridges the distance between the undiluted areas 35.

The spine 57 is formed by the potting material 54 with embedding of the crosslinking zone 47 of the respective insert sheet 15. The bead 42 and the bending zone 48 enclosing it are formed free of potting material 34 and thinned and thus allow a simple impact of the single side 27 with respect to the undiluted region 35.

FIG. 8 shows a perspective view of a book-type document 11 with a book block 16 according to the method described above. The document 11 comprises a book cover 12 in which the book block 16 is mounted. The book block 16 includes a plurality of insert sheets 15, which may have different functions, which are described below. For example, the top and bottom insert sheet 15 of the book block 16 serve as a header 14, which is attached to the book cover 12, in particular glued. Alternatively, a single page 27 may be provided according to Figure 1 as the top and bottom layer in the book block 16 and form the header 14 for the book cover 12.

Furthermore, the insert sheet 15 can comprise a personalization data page 17 as a single page 27. The Personalisierdatenseite 17 is formed for example according to the ICAO standard and includes a picture 21 of the document holder, an OCR machine-readable line 22 and other personal data pages 23. The personal data page 17 may further include a transponder unit 24, in the data of the document holder and / or others Security features can be stored. Such Personalisierdatenseiten 17 include at least one layer of a thermoplastic material, in particular polycarbonate, so that for such a Personalisierdatenseite 17 preferably a configuration of an insert sheet 15 is provided, in which a first process step according to Figure 2b.

Furthermore, a plurality of insert sheets 15 may be formed as so-called inner sides 18. In this case, the individual pages 27 are formed to form the inside 18 of paper and are suitable, for example, for receiving visa temples or stickers.

Depending on the use of the book block 16, the configuration of the single sheets 15 with respect to the individual pages 27 can be varied.

BezugszahlenlisteLIST OF REFERENCE NUMBERS

11. Buchartiges Dokument11. Book-like document	41. Presswerkzeug41. Press tool
12. Bucheinband12. Book cover	42. Sicke42. beading
14. Vorsatz14. intent	43. Krümmung43. curvature
15. Einlageblatt15th insert sheet	44. Erhebung44th survey
16. Buchblock16th book block	46. Trennzone 46th separation zone
17. Personalisierdatenseite17. Personalization data page	47. Vernetzungszone47. Crosslinking zone
18. Innenseite18th inside	48. Biegezone48. bending zone
21. Bild 21st picture	51. Erste Außenseite51. First outside
22. Zeile 22nd line	52. Zweite Außenseite52. Second outside
23. Personalisierdaten23. Personalization data	54. Vergussmaterial54. Potting material
24. Transpondereinheit24. Transponder unit	56. Formwerkzeug56. Mold
25. Seitenkante von 27 26. Seitenkante von 1525th side edge of 27 26th side edge of 15	57. Buchrücken57. Spine
27. Einzelseite27. Single page	58. Aufnahmeraum58. Recording room
28. Angussschicht 29. Streifen28th sprue layer 29. Strip	59. Stirnseite59. front side
30. Verpresswerkzeug30. Pressing tool	61. Anpressfläche61. contact surface
31. Oberes Werkzeug31. Upper tool	62. Erste Formmatrize62. First molding die
32. Unteres Werkzeug 33. Seitenkante von 2932. Lower tool 33. Side edge of 29	63. Zweite Formmatrize63. Second molding die
34. Verdünnter Bereich34. Diluted area	64. Vertiefung64. deepening
35. Unverdünnter Bereich35. Undiluted area	65. Vorsprung 65th lead
36. Anbindungszone36. Connection zone

Claims

Method for producing a book block (16), in particular for a book-type document (11), in which a plurality of insert sheets (15) are aligned with their side edges (26) aligned and fixed one above the other to form a spine (57), characterized

- That a plurality of insert sheets (15) are formed with a thinned portion (34), wherein the insert sheet (15) consisting of

- A single edge (27) which is compressed with a pressing tool (30) in a side edge (25) of the single side (27) adjacent the edge region and the thinned portion (34) is generated, opposite an undiluted portion (35) of the single page (27) forms at least one bending zone (48), or

- A single side (27) connected to at least one a side edge (25) of the single side (27) covering strips (29) with a composite tool (30) and one at a side edge (30) of the strip (29) adjacent edge region and compressed a dilute region (34) is produced, which forms at least one bending zone (48) with respect to an undiluted region (35) of the single side (27),

in that in the thinned region (34) of the insert sheet (15) a separation zone (46) is introduced, by means of which the thinned region (34) of the insert sheet (15) is subdivided into the bending zone (48) and a crosslinking zone (47), wherein the crosslinking zone (47) adjoins the side edge (26) and the bending zone (48) lies between the separation zone (46) and the undiluted region (35), and

- That on the crosslinking zone (47) of the respective insert sheet (15) a potting material (54) applied and positioned one above the other in a mold (56) and the spine (57) for connecting the single sheets (15) is formed together.
A method according to claim 1, characterized in that a plurality of insert sheets (15) are arranged stacked one above the other and the crosslinking zones (47) are at least pressurized with the mold (56) and a material flow of the applied potting material (54) to form the spine ( 57) is generated.
Method according to Claim 2, characterized in that the material flow of the potting material (54) is produced in the receiving space (58) in the mold (56), and the side edges (26) pointing into the mold (56) are penetrated by the potting material (54). be embedded.
A method according to claim 1, characterized in that brought by the molding tool (57) the separation zones (46) of the insert sheets (15) abutting each other and the mold (56) in the direction of the mold from the (56) emerging undiluted areas ( 34) of the insert sheets (15) are sealed.
Method according to one of the preceding claims, characterized in that the molding tool (56) directly adjacent to the side edges (26) of the insert sheets (15) engages, so that with increasing pressure, a material flow of the potting material (54) in the receiving space (58) driven becomes.
Method according to one of the preceding claims, characterized in that the molding tool (46) for generating the material flow of the potting material (54) is heated.
A method according to claim 6, characterized in that in the crosslinking zone (47) of the insert sheet (15) at least one heating wire or a microwave-activated heat source is introduced and heated at least during the generation of the material flow of the potting material (54) by the mold (56).
Method according to one of the preceding claims, characterized in that a sprue layer (28) is applied to the edge region of the insert sheet (15), which adjoins the side edge (26) of the insert sheet (15).
Method according to one of claims 1 to 7, characterized in that a sprue layer (28) is applied to an edge region of the single side (27) which lies in the undiluted region (35) and to the thinned region (34) of the single side (27 ) and in the undiluted region (35) a connection zone (36) is formed.
Method according to one of Claims 8 or 9, characterized in that the at least one sprue layer (28) is compressed by a pressing tool (30) and preferably at the same time the thinned area (34) and adjoining the connecting zone (36) in the undiluted area (35). is formed.
A method according to claim 10, characterized in that the at least one sprue layer (28) is compressed by a non-plane-parallel pressing tool (30), so that a sealing compression towards the bending zone (48) and a preferential flow direction towards the spine (57) are produced.
Method according to one of claims 8 to 11, characterized in that the sprue layer (28) is applied as edge band in the form of a film or sprayed or applied as a flowable layer.
Method according to one of the preceding claims, characterized in that the potting material (54) is a natural substance or plastic which is crosslinked at least under pressure, temperature, by chemical auxiliaries or by irradiation.
Method according to one of the preceding claims, characterized in that a printable layer, in particular a paper layer, is provided for the single side (27).
Insert sheet for a book block (16), which has a single side (27) with an undiluted region (35) of the single side (27) and along a side edge (26) to the undiluted region (35) extending thinned region (34), in in which a separation zone (46) is introduced, such that between the separation zone (46) and the side edge (26) a crosslinking zone (47) for connecting to further insert sheets (15) and between the separation zone (46) and the undiluted region (35) a bending zone (48) is formed in the thinned region (34).
Insert sheet according to claim 15, characterized in that a sprue layer (28) is applied to the thinned area (34) and at least partially penetrated.
An insert sheet according to claim 16, characterized in that in the edge region of the undiluted region (35) which adjoins the thinned region (34), a bonding zone (36) with the sprue layer (28) is formed.
Insert sheet according to claim 15, characterized in that the separation zone (46) is formed as a bead (42) having on a first outer side opposite the bending and crosslinking zone (48, 47) raised curvature (43) and in particular on the Having opposite second outer side at least in the transition from the separation zone (46) to the crosslinking zone (47) has a survey (44).
A book block with a plurality of insert sheets (15) according to any one of claims 15 to 18, wherein a plurality of insert sheets (15) are stacked and arranged with their side edges (26) aligned with each other and with a spine (57) connected to a book block (16) ,
Book block according to claim 19, characterized in that a potting material (54) in the cross-linking zone of the single side (27) extends between the bead (42) and the side edge (26) in the thinned region (34) or embeds the side edges (26).
Book block according to claim 19, characterized in that the thinned portions (34) and the potting material (54) for forming the spine (57) have a thickness which corresponds to the thickness of the superimposed single sides (27) of the undiluted portion (35).
A book block according to claim 19, characterized in that the layer thickness of the potting material (54) between two adjacent thinned areas (34) is formed such that an extension plane of the undiluted area (35) and an extension plane of the thinned area (34) in a common plane lie.