JP7483425B2 - Sheet processing method, bookbinding method and bound product - Google Patents

Description

The present invention relates to a sheet processing method, a bookbinding method, and a bound product.

There is a known method of creating a photo album by binding printed sheets. Patent Document 1 discloses a binding method in which a sheet is cut into a portion with a printed image and a binding margin, the two are separated and joined together with tape, and the binding margin is bound together. The portion of the tape that straddles the two forms a flexible hinge that bends easily, so when the resulting bound book is opened, the double-page spread opens flat. This allows the viewer to view a photograph or illustration that spans two pages without feeling particularly uncomfortable.

Patent No. 6128923

In the method described in Patent Document 1, the tape is visually overlapped with the printed image on the bound side of the sheet surface. Therefore, the viewer may feel a visual discomfort due to the difference between the surface properties of the printed image and the tape. For example, even a one-page printed image may be visually uncomfortable on the binding margin side. In addition, in the case of a printed image spanning two pages, for example, a visual discomfort may be felt regarding the continuity of the photographs and illustrations. In addition, in the case of a two-page spread image, if the tape forming the binding margin is visually visible near the boundary between the two pages when the bound product is opened, the photographs and illustrations may be visually discontinuous, and the sense of unity of the images may be lost.
The present invention aims to provide a bound product and a sheet processing method that prevents the tape from overlapping the printed image and improves the visual continuity and unity of two pages in a double-page spread.

The present invention is a sheet processing method for processing sheets for bookbinding, comprising a notch forming step of forming a notch on the side of the sheet to be bound that divides the thickness of the sheet, an insertion step of inserting into the notch a part of a connecting piece that is attached to the sheet and functions as a hinge in the bound state, and a joining step of joining the inserted part of the connecting piece inserted into the notch to the sheet, wherein in the notch forming step, a slit-shaped notch of a predetermined depth is formed by a cutter on the side of the sheet held on a holding table, dividing the thickness of the sheet in two and running along the side of the sheet.
In addition, the bound product of the present invention is processed by the sheet processing method described above, and has a plurality of sheets, each having a notch on the side, and connecting pieces, a portion of which is inserted into the notch of each sheet and joined to each sheet, and the plurality of sheets are bound via the connecting pieces.

According to the present invention, a connecting piece is inserted into a slit on the side of the sheet to be bound, so that a sheet processing method and bound product can be provided in which the tape does not visually overlap the printed image on the surface of the sheet. In addition, according to the present invention, a sheet processing method and bound product can be provided that can improve the visual continuity and unity of the printed images on two pages of a spread.

1 is a schematic diagram showing the configuration of a bound product according to a first embodiment of the present invention; 2 is a schematic diagram of a sheet constituting the bound product shown in FIG. 1 . FIG. FIG. 2 is a partially enlarged view of the sheet shown in FIG. FIG. 2 is a schematic diagram of a cutting device used in the production of the sheet shown in FIG. 1 . FIG. 2 is a schematic diagram of a double-sided tape used in the production of the sheet shown in FIG. 1 . 2A to 2C are cross-sectional views showing a method for manufacturing the sheet shown in FIG. 1 . FIG. 11 is a schematic diagram showing the configuration of a bound product according to a second embodiment of the present invention. 8A to 8C are cross-sectional views showing a method for manufacturing the sheet shown in FIG. 7 .

The present invention will be described in more detail below with reference to embodiments and examples. The present invention is not limited to the following embodiments and examples without departing from the gist of the present invention.
First Embodiment
A first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view of a bound material B according to the first embodiment of the present invention, in which FIG. 1(a) shows a state in which the sheet portion of the bound material B is closed, and FIG. 1(b) shows a state in which the sheet portion of the bound material B is opened. FIG. 2 is a schematic diagram of the configuration of each sheet S constituting the bound material B, in which FIG. 2(a) is a plan view, and FIG. 2(b) shows a cross-sectional view cut along line A-A in FIG. 2(a). FIG. 3(a) is an enlarged view of part B in FIG. 2(a), and shows a sheet S with a slit 5, a connection piece 4 with one part inserted into the slit 5, and spacers 1a and 1b joined to the other part of the connection piece 4. FIG. 3(b) shows a schematic enlarged view of the slit 5 of the sheet S before the connection piece 4 is inserted in part C in FIG. 3(a). In the following description, the short side direction of the connection piece 4 may be referred to as the width direction or X direction, and the length of the short side direction of the connection piece 4 may be referred to as the width. The long side direction of the connection piece 4 may be referred to as the Y direction.

The bound product B has a plurality of sheets S, a connecting piece 4 joined to the sheet S, spacers 1a, 1b joined to both sides of the connecting piece 4, endpapers 2a, 2b, and a cover 3. The connecting pieces 4 and the spacers 1a, 1b are bound together with the endpapers 2a, 2b by a well-known method such as thread binding, staple binding, or bonding, and are fixed to the inside of the cover 3. The bound product B of this embodiment has six sheets S, but the number of sheets S is not limited. Although the sheets S are paper, various materials used in bookbinding, such as plastic, woven fabric, and nonwoven fabric, can be used. However, in order to perform the slit processing described later, it is preferable that the thickness of the sheets S is 200 μm or more. Images 7 such as photographs and illustrations are printed on both sides of the sheets S.

The side 6 of the sheet S to be bound has a slit-like notch 5 formed over the entire length of the side 6 in the Y direction at a predetermined depth D so as to divide the thickness of the sheet S. As shown in FIG. 3B, the notch 5 has a roughly triangular or tapered shape in which the dimension in the thickness direction decreases as it moves away from the side 6. A part of one connecting piece 4 in the X direction is inserted into the notch 5 of each sheet S. Multiple sheets S are bound via the connecting piece 4. The connecting piece 4 is a roughly rectangular plate-like piece of uniform thickness having a long side that is roughly the same length as the entire length of the side 6 on which the notch 5 of the sheet S is formed and a short side that is shorter than the long side. The connecting piece 4 has a flexible film base material. One part of the connecting piece 4 in the width direction that is inserted into the notch 5 is called the insertion part 4a, and the other part in the width direction that is not inserted into the notch 5 is called the non-insertion part 4b. The connecting piece 4 is a so-called double-sided tape with adhesive properties on both sides. The insertion portion 4a of the connection piece 4 is bonded to the sheet S, more specifically, to the cut surfaces 5a and 5b of the cut 5, by the adhesive component on its surface.

The portion of the sheet S into which the connecting piece 4 is inserted is compressed in the thickness direction after the connecting piece 4 is inserted. As a result, as shown in FIG. 3(a), the portion of the sheet S into which the connecting piece 4 is inserted has approximately the same thickness as the portion of the sheet S into which the connecting piece 4 is not inserted. However, if the connecting piece 4 is thick, the sheet S will swell at the insertion portion 4a of the connecting piece 4, and a convex portion will occur on the printed surface of the sheet S. Therefore, it is preferable that the thickness t3 of the insertion portion 4a of the connecting piece 4 is less than half the thickness t4 of the sheet S. In order to ensure the strength of the thin connecting piece 4, the connecting piece 4 has a film base material that is stronger than paper. The depth D of the slit 5 in the X direction measured from the side surface 6 of the sheet S is greater than the insertion length of the connecting piece 4, that is, the length d of the insertion portion 4a in the X direction. This is because the slit 5 is formed in a tapered shape, and if D=d, a convex portion will occur due to the connecting piece 4 at the tip of the slit 5. In addition, in the manufacturing method described below, the workability is improved by stopping the insertion of the connecting piece 4 just before the tip of the slit 5. For the above reasons, it is preferable that the length d of the insertion portion 4a of the connection piece 4 is 90% or less of the depth D of the slit 5. On the other hand, if the length d of the insertion portion 4a is small, the adhesive strength of the connection piece 4 with the sheet S decreases. For this reason, it is preferable that the length d of the insertion portion 4a of the connection piece 4 is 50% or more of the depth D of the slit 5.

A pair of spacers 1a, 1b are provided on both sides of the non-inserted portion 4b of the connecting piece 4. The spacers 1a, 1b are made of paper or film. If the spacers 1a, 1b are too thick, gaps are likely to occur between the pages on both sides when the pages are opened, so it is preferable that the thickness of each spacer 1a, 1b is less than half the thickness of the sheet S. Therefore, the sum of the thickness of the spacers 1a, 1b on both sides of the connecting piece 4 and the thickness of the connecting piece 4 is approximately the same as the thickness of the sheet S. The pair of spacers 1a, 1b are formed at a distance from the inserted portion 4a of the connecting piece 4 in the X direction. As a result, a gap c that is parallel to the side surface 6 and has a predetermined dimension is provided between the sheet S and the spacers 1a, 1b. This portion is an exposed portion of the connecting piece 4 where neither the sheet S nor the spacers 1a, 1b are provided, and forms a flexible hinge 4c of the connecting piece 4. In other words, the connecting piece 4 functions as a hinge 4c. Because the hinge 4c is easier to bend than the sheet S, as shown in FIG. 1(b), when the bound product B is opened, the left and right pages become flat, enabling so-called lay-flat binding.

As shown in Figures 2(b) and 3(a), the adhesive surface is exposed in the region (hinge 4c) between the sheet S of the connecting piece 4 and the spacers 1a and 1b, so there is a possibility that the connecting pieces 4 or the connecting piece 4 and the sheet S will stick to each other during bookbinding. Therefore, it is preferable that the adhesive strength of the region (hinge 4c) where the gap c of the connecting piece 4 is formed is smaller than the adhesive strength of other regions. The adhesive strength can be adjusted by attaching fine particles to the adhesive surface or by using a connecting piece 4 that does not have adhesive applied in advance in the region that becomes the hinge 4c.

The dimension of the gap c between the sheet S and the spacers 1a and 1b, that is, the length of the hinge 4c in the X direction, is different for each sheet S. That is, as shown in FIG. 1, when the spine of the bound product B is placed down, the lower end of the sheet S has a gentle mountain shape in which the central sheet S is higher than the sheet S on the cover 3 side. In other words, the dimension of the gap c increases from the sheets S located at both ends toward the sheets S located at the center. The upper ends of the spacers 1a and 1b are located at almost the same height as each sheet S. If the length of the hinge 4c is H1, H2, and H3 (H3>H2>H1) from the outer sheets S1, S2, and S3 in that order, it is preferable that the difference (H3-H2) and (H2-H1) in the hinge length between adjacent sheets S is equal to or larger than the thickness of the sheet S. On the other hand, if the difference (H3-H2) and (H2-H1) in the hinge length is large, the gap c between the pages will be wider when the pages are opened, so it is preferable to keep it to a minimum. By adjusting the hinge length, the spread portion becomes substantially flat regardless of which page is spread. In addition, the continuity of the two pages is not lost. FIG. 1(b) shows a cross section in which the center page is spread, but if the reader supports the cover 3 with his/her hand, the gap G1 of the spread portion can be reduced regardless of which page is spread, and the spread portion becomes substantially flat. It is preferable that the hinge length be changed according to at least one parameter of the number of sheets S to be bound, the thickness of the laminate in which the sheets S are bound, and the thickness of the sheets S. It is preferable that the hinge length be increased as the number of sheets S to be bound, the thickness of the laminate, and the thickness of the sheets S are increased. In order to provide a difference in the hinge length, the length of the spacers 1a and 1b may be changed, or the relative positions of the spacers 1a and 1b may be changed. In addition, the dimension of the gap c, i.e., the X-direction length of the hinge 4c, can be adjusted by the arrangement pitch of the sheets S, the thickness of the connection piece 4, and the deformation amount of the hinge 4c.
With the above-mentioned configuration, the connecting piece 4 does not overlap the surface of the printed image, so the surface texture becomes uniform and there is no sense of visual discomfort. In addition, the visual continuity and sense of unity of the two pages in a double-page spread is improved.

<Method of manufacturing bound product B according to the first embodiment>
A method for manufacturing a bound product B according to the first embodiment will be described. First, the sheets S are processed for bookbinding by a sheet processing method described below, and then the processed sheets S are bound into a book. Since the bookbinding method is the same as in the past, the processing method for the sheets S will be mainly described here.
First, the cutting device 10 forms a notch 5 on the side surface 6 of the sheet S where the connecting piece 4 is inserted, that is, the side surface 6 on the spacer 1a, 1b side. FIGS. 4(a) and 4(b) show a top view and a side view of the cutting device 10, respectively. The cutting device 10 is composed of a holding table 11 that positions and holds the sheet S, and a cutter unit 12. The holding table 11 is provided with L-shaped plates 13a, 13b for positioning, and the sheet S is positioned by being abutted against the L-shaped plates 13a, 13b. The sheet S is held on the holding table 11 by an appropriate method. The method of holding the sheet S is not limited, and may be a method of charging the holding table 11 to hold the sheet S by static electricity, or a method of opening a plurality of fine holes in the holding table 11 to adsorb and hold the sheet S by negative pressure. The cutter unit 12 is composed of a cutter 14 that forms a notch 5 on the side surface 6 of the sheet S, and a cutter holding portion 15 that holds the cutter 14. The tip of the cutter 14 is tapered, and the other part (general part) has a constant cross section. The cutter holding part 15 can move the cutter 14 along the thickness direction of the sheet S and the direction parallel to the side surface 6 of the sheet S (Y direction). The cutter holding part 15 is composed of a slide unit 16 that moves the cutter 14 in the Y direction, and a lifting platform 17 that adjusts the position of the cutter 14 in the thickness direction of the sheet S. The height of the lifting platform 17 is adjusted so that the tip of the cutter 14 is located at the center of the thickness direction of the sheet S. The cutter 14 is placed against the sheet S, and the slide unit 16 slides the cutter 14 in the Y direction along the side surface 6 of the sheet S to form the slit 5. The slit 5 divides the side surface 6 of the sheet S into two in the thickness direction of the sheet S. If the cutter 14 is thick, the printed surface is likely to bend when the slit 5 is formed, so the thickness of the general part of the cutter 14 is preferably equal to or less than the thickness of the sheet S.

Figure 5 shows a perspective view of the connection piece 4. First to fourth release papers 7a to 7d, which can be peeled off individually, are attached to both sides of the connection piece 4. The first and second release papers 7a, 7b are attached to one side 4d (see Figure 6(b)), which is the upper side of the connection piece 4, so as to be separable from each other in the width direction X. The third and fourth release papers 7c, 7d are attached to the other side 4e (see Figure 6(b)), which is the lower side of the connection piece 4, so as to be separable from each other in the width direction X. The width W1 in the X direction of the first to fourth release papers 7a to 7d is 1/2 the width W0 in the X direction of the connection piece 4. The thickness t1 of the first and second release papers 7a, 7b is thinner than the thickness t2 of the third and fourth release papers 7c, 7d (t1<t2).

Figure 6 shows the procedure for processing the sheet S for bookbinding, that is, the procedure for inserting the connection piece 4 into the slit 5 of the sheet S and forming the spacers 1a and 1b. First, as shown in Figure 6 (a), the cutter 14 is used to cut into the side 6 of the sheet S, and the slit 5 is formed over the entire length of the side 6 in the Y direction. Next, as shown in Figures 6 (b) and 6 (c), the third release paper 7c is peeled off, and one part (insertion part 4a) of the connection piece 4 is inserted into the slit 5 of the sheet S. In order to easily insert the connection piece 4 into the slit 5, the upper surface of the sheet S may be sucked to widen the opening of the slit 5. Since the third release paper 7c, which is thicker than the first release paper 7a, has been peeled off, it becomes easy to insert the connection piece 4 into the slit 5. In addition, since the first release paper 7a remains, it is easy to ensure the rigidity of the insertion part 4a. Since the second release paper 7b and the fourth release paper 7d remain, it is also easy to prevent the connection piece 4 from folding or bending when inserting the connection piece 4 into the slit 5.

Next, as shown in FIG. 6(c), the first release paper 7a is peeled off, and the sheet S is pressed from above to close the slit 5, and the connection piece 4 is joined to the cut surfaces 5a and 5b on both sides of the slit 5. Next, the second release paper 7b is peeled off, and the spacer 1a is attached to one surface 4d of the non-inserted portion 4b of the connection piece 4, as shown in FIG. 6(d). Furthermore, as shown in FIG. 6(e), the fourth release paper 7d is peeled off, and the spacer 1b is attached to the other surface 4e of the non-inserted portion 4b of the connection piece 4. In other words, the second release paper 7b and the fourth release paper 7d of the non-inserted portion 4b are peeled off after the connection piece 4 is inserted and before the spacers 1a and 1b are formed. The order in which the spacers 1a and 1b are attached may be reversed. This completes the processing for binding the sheet S. The above steps are carried out for multiple target sheets S, and the non-insertion portions 4b of the processed multiple sheets S, the spacers 1a, 1b, and the inside papers 2a, 2b are bound together, the cover 3 is attached, and the inside papers 2a, 2b are glued to the cover 3 to complete the bound product B.

Second Embodiment
A second embodiment of the present invention will be described. Here, differences from the first embodiment will be mainly described. The points omitted are the same as those in the first embodiment. FIG. 7 is a cross-sectional view of a bound material B according to the second embodiment of the present invention, and shows the bound material B with its spine facing down. FIG. 7(a) shows the bound material B in a closed state, and FIG. 7(b) shows the bound material B in an open state. FIG. 7(c) is an enlarged view of a portion D in FIG. 7(a), showing an enlarged connection piece. As shown in FIG. 7(c), a slit 105 is formed on the side 6 of the bound side of the sheets S, as in the first embodiment. However, unlike the first embodiment, one part of two connection pieces 104 is inserted into the slit 105. The other parts of each connection piece 104 are inserted into the slits 105 of other adjacent sheets S on both sides. That is, two adjacent sheets S are bridged or connected by one connection piece 104. In this embodiment, the connection piece 104 is used to join one sheet S to another adjacent sheet S. The central portion of each connecting piece 104 exposed outside the sheet S may or may not be joined to the side surface 6 of the sheet S. The positions of the bottom ends of the sheets S on the binding side are aligned with each other for each sheet S. As shown in Fig. 7(a) , only one connecting piece 104 is inserted into the slits of the sheets S of the pages that will be the first and last when bound.

The first and last pages of the sheet S are attached to half of the inside paper 2a, 2b by a known method such as adhesive or adhesive tape, and the other half of the inside paper 2a, 2b is joined to the cover 3 by a similar method. The connecting piece 104 is easier to bend than the sheet S, so when the bound product B is opened, the connecting piece 104 is bent. This makes the left and right pages flat when the bound product B is opened, enabling so-called lay-flat binding. Compared to the first embodiment, the second embodiment can make the gap between the left and right pages smaller when the bound product B is opened. In the first embodiment, the hinge 4c is bent so that the left and right pages can be made flat when the bound product B is opened, but at this time, the two hinges 4c are located between the left and right pages and are recognized by the viewer as part of the gap between the pages. Therefore, the gap G1 between the pages in the first embodiment is (arrangement pitch of the sheet S (hinge 4c) + thickness of the connecting piece 4 + deformation amount of the hinge 4c). In contrast, the gap G2 between pages in the second embodiment is the length of the connecting piece 104 bridging the left and right pages, i.e., the pitch of the sheets S, as shown in FIG. 7(b), so G1>G2. With the above configuration, the connecting piece 104 does not overlap the surface of the printed image, so the surface texture is uniform and there is no visual discomfort. In addition, the visual continuity and sense of unity of the two pages in a spread are improved. The parts of the connecting piece 104 that are not inserted into the slits 105 of the sheets S on both sides (the parts of the gap G2) form a hinge. The size of the gap G2 is adjusted according to the arrangement pitch of the sheets S, and is constant regardless of the position of the sheets S.

<Method of manufacturing bound product B according to the second embodiment>
A method for manufacturing a bound product B according to the second embodiment will be described with reference to FIG. 8. In this embodiment, the sheets S are first processed by a sheet processing method for bookbinding, and then the processed sheets S are bound. Since the bookbinding method is the same as in the conventional method, the processing method for the sheets S will be mainly described here. In the following description, in order to refer to a plurality of sheets, the sheets that will be the first to third pages when bound will be referred to as the first to third sheets S101 to S103, respectively, and the slits in the first to third sheets S101 to S103 will be referred to as the first to third slits 105a to 105c, respectively. The connection piece inserted into the first and second slits 105a and 105b will be referred to as the first connection piece 104a, and the connection piece inserted into the second and third slits 105b and 105c will be referred to as the second connection piece 104b. The connection piece inserted second into the third slit 105c will be referred to as the third connection piece 104c. The first to third connection pieces 104a to 104c are the same as the connection piece 4 of the first embodiment, and are provided with four release papers as shown in FIG.

First, as shown in FIG. 8A, a first slit 105a is formed on the side surface 6 of the first sheet S101. Next, one portion of the first connection piece 104a is inserted into the first slit 105a. Next, the first slit 105a is closed to bond the first connection piece 104a to the first sheet S101. The steps up to this point are performed in the same manner as in the first embodiment. This completes the processing of the first sheet S101.
Next, a second slit 105b is formed on the side surface 6 of the second sheet S102 by the same method as in the first embodiment. Then, with the side surface 6 of the second sheet S102 facing the side surface 6 of the first sheet S101, the first connection piece 104a from which the fourth release paper 7d has been peeled off and the second connection piece 104b from which only the third release paper 7c has been peeled off are simultaneously inserted into the second slit 105b. That is, the other part of the first connection piece 104a and one part of the second connection piece 104b are inserted into the second slit 105b of the second sheet S102. In addition, since the second release paper 7b of the first connection piece 104a and the first release paper 7a of the second connection piece 104b are left, it is possible to prevent the first connection piece 104a and the second connection piece 104b from coming into contact with each other when they are inserted, and causing wrinkles or creases. The connection pieces are connected with a predetermined gap G2 so that a hinge can be formed between the first sheet S101 and the second sheet S102 in the bound state.

Next, as shown in FIG. 8(b), the second release paper 7b of the first connection piece 104a and the first release paper 7a of the second connection piece 104b are peeled off, and the second sheet S102 is pressed from above to close the second slit 105b. The first connection piece 104a is bonded to one side of the second slit 105b and the second connection piece 104b is bonded to the other side, and the first connection piece 104a and the second connection piece 104b are bonded to each other. This completes the processing of the second sheet S102.

Next, as shown in FIG. 8(c), the second sheet S102 is rotated relative to the first sheet S101 and folded back. In the illustrated example, the first sheet S101 is rotated relative to the second sheet S102 and folded back, but the second sheet S102 may be rotated relative to the first sheet S101 and folded back. The first connecting piece 104a is deformed into a roughly U-shape, and the side surface 6 of the first sheet S101 and the side surface 6 of the second sheet S102 are located on the same plane. At this time, the relative position of the first sheet S101 or the second sheet S102 in the X direction may be adjusted as necessary to eliminate slack in the first connecting piece 104a. The first connecting piece 104a may be pressed against the side surface 6 of the first sheet S101 and the side surface 6 of the second sheet S102. Next, as shown in FIG. 8(d), the first sheet S101 and the second sheet S102 are rotated 180 degrees so that the first sheet S101 is on top of the second sheet S102. After that, a third slit 105c is formed in the side surface 6 of the third sheet S103. Then, with the side surface 6 of the third sheet S103 facing the side surface 6 of the second sheet S102, the other part of the second connecting piece 104b and one part of the third connecting piece 104c are inserted into the third slit 105c. After that, the steps shown in FIG. 8(c) to FIG. 8(e) are repeated to form a stack 9 (see FIG. 7(a)) of sheets joined together by the joining pieces. Finally, the endpapers 2a, 2b and the cover 3 are attached to the stack 9 to complete the bookbinding.

The sheets used in Example 1 and Example 2 were the same, and were double-sided photographic sheets of A5 size and 240 μm thick. A slit 5 was formed on the long side of the sheet using the cutting device 10 shown in FIG. 4. The thickness of the cutter 14 of the cutting device 10 was 0.2 mm, and the depth D of the slit 5 was 8 mm. In both Example 1 and Example 2, six-page books were bound.

Example 1
A specific example of the first embodiment will be described as Example 1. Here, six sheets were processed for bookbinding, and bookbinding was performed. The connection piece 4 is an acrylic adhesive provided on a polyester film substrate. The thickness t3 of the connection piece 4 is 60 μm, the length L (see FIG. 5) is 210 mm, the adhesive strength is 12 N/25 mm, and the shear adhesive strength is 340 N/4 cm ^2. The width W0 of the connection piece 4 varies depending on the page. The width W0 of the connection piece 4 of the sheets of the first and sixth pages is 10.2 mm, the width W0 of the connection piece 4 of the sheets of the second and fifth pages is 10.45 mm, and the width W0 of the connection piece 4 of the sheets of the third and fourth pages is 10.7 mm. The release paper of the connection piece 4 is divided into four as shown in FIG. 5, and the thickness t1 of the first and second release papers 7a and 7b is 20 μm, and the thickness t2 of the third and fourth release papers 17c and 7d is 50 μm. The spacers 1a and 1b were made of high-quality paper having a thickness of 100 μm and a width of 5 mm.

A slit 5 of 8 mm length was made in each sheet, and the connecting piece 4 was inserted into the slit 5 to a depth of 5 mm. The spacers 1a and 1b were attached so that the end faces opposite the sheets were aligned. The width of the hinge 4c differed depending on the page, being 0.2 mm for pages 1 and 6, 0.45 mm for pages 2 and 5, and 0.7 mm for pages 3 and 4. In order to reduce the adhesive strength of the adhesive surface of the connecting piece 4 exposed at the hinge 4c, baby powder with a particle diameter of 10 to 30 μm was attached to the adhesive surface. The processed 6-page sheet was sandwiched between endpapers 2a and 2b, which are high-quality paper with a thickness of 100 m, and these were stably bound, and then a hard cover 3 of 6 mm thickness was attached, and the endpapers 2a and 2b were glued to the cover 3 to bind the book.

Example 2
A specific example of the second embodiment will be described as Example 2. Here, six sheets were processed for bookbinding, and bookbinding was performed. The connecting piece 104 was formed by providing an acrylic adhesive on a polyester film substrate. The connecting piece 104 had a thickness t3 of 30 μm, a width W0 of 10.25 mm, a length L of 210 mm, an adhesive strength of 13 N/25 mm, and a shear adhesive strength of 380 N/4 ^cm2 . The release paper of the connecting piece 104 was divided into four as shown in FIG. 5, and the thickness of the release paper was the same as that of Example 1. A slit 5 of 8 mm in length was formed in each sheet, and the connecting piece 104 was inserted into the slit 5 to a depth of 5 mm. An inside cover 2a made of high-quality paper with a thickness of 100 μm was glued to the first page of a stack of six sheets, and an inside cover 2b of the same material and thickness was glued to the sixth page, and a hard cover 3 with a thickness of 6 mm was glued to each inside cover 2a, 2b to bind the sheets.

4 Connection piece 5 Slit 6 Side of the sheet to be bound S Sheet

Claims (18)

A method for processing sheets for bookbinding, comprising the steps of:
a slit forming step of forming a slit for dividing the thickness of the sheets on a side of the sheets to be bound;
an inserting step of inserting a part of a connecting piece, which is attached to the sheet and functions as a hinge in a bound state, into the slit;
a joining step of joining the inserted portion of the connection piece inserted into the slit to the sheet;
having
In the cut-forming process, a sheet processing method is performed in which a cutter is used to divide the thickness of the sheet into two on the side of the sheet held on a holding table, and to form a slit-shaped cut of a predetermined depth along the side of the sheet . The sheet processing method according to claim 1 , wherein the connection piece is inserted into the slit so that a length of the inserted portion is 50% or more and 90% or less of a depth of the slit. The sheet processing method according to claim 1 or 2 , wherein the connecting piece has a base material made of a flexible film. A sheet processing method as described in any one of claims 1 to 3, wherein one of the connection pieces is inserted into the slit of the sheet, the one of the connection pieces has adhesive on both sides, and the one of the connection pieces is joined to the sheet by closing the slit. A sheet processing method as described in any one of claims 1 to 4, wherein the connecting piece has spacers on both sides thereof, opposite the portion inserted into the sheet, and separated from the portion by a predetermined gap. The sheet processing method according to claim 5 , wherein an adhesive strength of the connecting piece in the area where the gap is formed is smaller than an adhesive strength of other areas. The sheet processing method described in claim 5, wherein the thickness of each spacer is less than half the thickness of the sheet, and the sum of the thickness of the spacers on both sides of the connecting piece and the thickness of the connecting piece is approximately the same as the thickness of the sheet. Processing a plurality of sheets by the sheet processing method according to claim 6 or 7 ;
and binding the processed sheets together at the spacer portions and with a cover. the slit forming step includes forming a first slit and a second slit on a first side surface of the first sheet and a second side surface of the second sheet, respectively;
the inserting step includes inserting one portion of a first connection piece into the first slit of the first sheet and inserting the other portion of the first connection piece into the second slit of the second sheet;
The sheet processing method described in claim 1, wherein the joining process includes joining one portion of the first connection piece inserted into the first slit to the first sheet by closing the first slit of the first sheet, and joining the other portion of the first connection piece inserted into the second slit to the second sheet by closing the second slit of the second sheet. the first connection piece has a gap of a predetermined distance between the one portion joined to the first sheet and the other portion joined to the second sheet,
The sheet processing method according to claim 9 , further comprising a overlapping step of overlapping the first sheet and the second sheet by folding back the first sheet and the second sheet at the gap. The sheet processing method described in claim 10, wherein in the insertion process, one portion of the second connection piece is inserted into the second slit of the second sheet together with the other portion of the first connection piece, and in the joining process, the other portion of the first connection piece and the one portion of the second connection piece inserted into the second slit of the second sheet are joined to the second sheet, and the overlapping process is performed after the insertion process. 12. The sheet processing method according to claim 11 , wherein the incision forming step, the insertion step, the joining step, and the overlapping step are repeated for a plurality of sheets to create a stack of a plurality of sheets in which adjacent sheets are connected by the connecting pieces;
and attaching a cover to the laminate. A bound product comprising a plurality of sheets, each having a notch on a side , processed by the sheet processing method described in claim 1, and connecting pieces, a portion of which is inserted into the notch of each sheet and joined to each sheet, wherein the plurality of sheets are bound together via the connecting pieces. The article according to claim 13 , wherein the connecting piece has a flexible film substrate. A bound product as described in any one of claims 13 to 14, which has a pair of spacers on both sides of a non-inserted portion of the connecting piece that is not inserted into the sheet, spaced apart from an inserted portion inserted into the sheet, and a plurality of the connecting pieces and a plurality of the pairs of spacers are bound together to form a book, with the gap between the inserted portion of the connecting piece and the spacers forming a hinge. The bound product of claim 15, wherein the gap is adjusted by the arrangement pitch of the sheets, the thickness of the connecting piece, and the deformation amount of the hinge, and the dimension of the gap increases from the sheets located at both ends toward the sheet located in the center. A bound product as described in any one of claims 13 to 14, wherein two of the connecting pieces are inserted into the slits of the sheet, each connecting piece is inserted into the slits of the sheets on both sides of the sheet, and the parts of the connecting pieces that are not inserted into the slits of the sheets on both sides form a hinge. The bound product according to claim 17 , wherein the portion is adjusted according to an arrangement pitch of the plurality of sheets and is constant regardless of the position of the sheets.

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