SOFT-COVER BOOK BLOCK AND METHOD FOR THE MANUFACTURE OF SAME

Abstract: A soft-cover book block, which comprises a book block (1) consisting of leaves joined together at their spine edges, a soft cover (2) fastened to the book block, as well as a member for fastening the soft cover to the book block so that the spine part (5) of the cover (2) is apart from the spine (4) of the book block (1), is manufactured so that a resiliently compressible sleeve (3), which is non-penetrable by glue, functions as the fastening member, and whose circuit is at least twice the width of the spine (4) of the book block (1) and whose length is preferably equal to the height of the spine of the book block, is fastened at one side onto the spine part (5) of the cover (2) and thereinafter at the opposite side onto the spine (4) of the book block (1).

Description: Soft-cover book block and method for the manufacture of same The present invention is concerned with a soft-cover book block and in particular with such a soft-cover book block as comprises a book block consis¬ ting of sheets, leaves, etc. joined together at their spine edges, a soft cover fastened to the book block, as well as a member for fastening the soft cover to the book block so that the spine part of the cover is apart from the spine part of the book block. In the present connection, the spine part is understood as meaning, in addition to the spine proper of the book block or of the cover, also an area that extends partly beyond the folding lines of the spine towards the opening side of the book. In the prior-art soft-cover book blocks, the book block is usually glued onto the spine of the soft cover over its entire length and width, and in some cases the cover is additionally glued over a certain distance . from the spine edge of the book block onto the first and last leaf of the book block so as to obtain a stronger fastening between the cover and the book block. The spine of a book block made in this way is rather rigid, whereby the book opens itself poorly and is difficult to read. This is why the spine of the book is readily broken, and especially the first and last leaves of the book block tend to be detached when attempts are made to turn the leaves of the book more open by orce. From the Finnish Patent Application 791,516, a soft-cover paperback book is known in which a support layer is fastened to the spine of the book block and the soft cover is fastened to the book block only at its front and back cover along fastening strips running at the spine edges of the first and last leaf of the book block, so that the spine portion of the cover between the fastening strips is loose from the spine of the book OMPI block. In this prior—art solution, the spine of the soft cover is not fastened to the spine of the book block, whereby the spine is not fastened to the leaves of the book block. In stead, in order to join the book block together, a thin, flexible, strong support layer is used, such as a crepe strip, which is fastened to the spine of the book block and which does not subtantially prevent opening of the leaves of the book. In this way, a more readily openable soft-cover paper- back book has been provided. As compared with the first-mentioned solution, this second solution, however, involves the drawback that a separate support layer is required to join .the book block together, in addition to which the soft cover is fastened to the book block only along narrow fastening strips placed at its front and back cover. Under these circums ances, the objective of the present invention is to provide a soft-cover book block wherein the so t cover is, fay means of a separate fastening member, -fastened to the book block so that the spine portion of the cover is apart from the spine portion of the block, so that no excessive strains are directed at the book block and especially not at its first and last leaves, but wherein the fastening is, nevertheless, performed substantially over the entire face of the spine portions of the soft cover and of the book block so as.to achieve a fastening that is of maximum strength but, yet, flexible, between the soft cover and the book block. Thus, by means of the present invention, the advantages present in the two prior-art solutions mentioned above have been obtained without their drawbacks. It is a further objective of the present invention to provide a method for the manufacture of a soft-cover book block by glueing the soft cover onto the book block by the intermediate of a separate fastening member non-penetrable by glue, so that the spine portion of the cover is apart from the spine portion of the book block. The principal characteristics of the invention come out from the attached patent claims. In a popular embodiment of the invention, the circuit of the elastically flexible sleeve, non-penetra¬ ble by glue, functioning as the fastening member, is preferably somewhat larger than twice the width of the spine of the book block, so that the sleeve extends a certain distance between the first leaf of the book block and the front cover and between the last leaf of the book block and the back cover. Moreover, the use of such a sleeve is rather independent from the thickness of the book block, whereby similar sleeves can be used for soft-cover book blocks of different thicknesses. Except over the entire width of the spine portion of the cover and of the spine portion of the book block, the sleeve may also be fastened only over the width of the spine of the cover and of the book block. When a wider sleeve is used, it is, however, advantageous not to apply glue to the end portions of the sleeve between the front cover and the first leaf and between the back cover and the last leaf, in order that a resilient fold should be formed between the front cover and the first leaf and between the back cover and the last leaf. In this way the sleeve functioning as the support member can be fastened more efficiently to the first and last page of the book block without, however, any high strains being directed at these pages on opening of the cover, because the flexible fold between the cover and the first or last page efficiently attenuates strains directed at the first and last page. A soft-cover book block in accordance with the invention is manufactured advantageously so that the flexible sleeve non-penetrable by glue, functioning as the fastening member, is first hot-glued onto the spine portion of the cover, and thereupon the book block is glued by its spine portion onto the sleeve fastened to the cover. The book block may be glued onto the sleeve, e.g., by means of hot-setting adhesive or by cold-glueing. By means of the fastening mode in accordance with the invention, a very large glueing area is achieved, i.e. a strong construction, which is, however, elastic, which means that the first and last - pages of the book do not tend to be detached when the book is handled, and the book opens itself readily, because the cover is not directly fixed to the book block. The invention will be described below in more detail with reference to the attached drawing, wherein Figure 1 is a partial perspective view of a popular embodiment of the invention, and Figure 2 is a partial perspective view of an elastically flexible sleeve used in the embodiment shown in Fig. 1. In Fig. 1, the book block is denoted with reference numeral 1 , and its first page with reference numeral 6, and its last page with reference numeral 7. The spine of the book block 1 is denoted with reference numeral 4 and its spine edges with reference numeral 12. The soft cover is generally denoted with reference numeral 2, and its front cover with reference numeral 8 and its back cover with reference numeral 9. The spine portion of the soft cover 2 is denoted with reference numeral 5, and the spine edges with reference numeral 11. As is seen from Fig. 1 , the book block 1 and the soft cover 2 are fixed to each other by their spine portions 4 and 5 by means of the elastically flexible sleeve 3 non-penetrable by glue, functioning as the fastening member. This sleeve 3 is shown in more detail in Fig. 2. As is seen from Fig. 1 , the circuit of the OMPI sleeve 3 is so large that it extends somewhat beyond . the spine edges 12 of the book block 1 and beyond the spine edges 11 of the cover 2 and is glued, besides over the entire width of the spine 4 of the book block 1 and of the spine portion 5 of the soft cover 2, also a certain distance onto the first leaf 6 and the last leaf 7 of the book block as well as, correspondingl , onto the front cover 8 and the back cover 9 of the soft cover 2. The sleeve 3 has, however, not been glued onto the cover 2 and onto the book block 1 over its entire circuit, i.e. from the fold 13 between the front cover 8 and the first leaf 6 to the fold 13' between the last leaf 7 and the back cover 9, but the application of glue has been ended slightly before the folds 13 and 13*. Thereby the portion of the sleeve 3 that passe-s beyond the spine edge 12 of the book block 1 and beyond the spine edge 11 of the cover forms a resilient fastening 10, which attenuates the strains directed at the first 6 and last 7 leaf of the book block 1 when the front cover 8 and the back cover 9 are being turned, and, neverthe¬ less, the book block 1 and the cover 2 are glued, besides over their entire spine portions 4 and 5, also somewhat beyond their spine edges 12 and 11 so as to achieve a fastening of maximum strength between the book block 1 and the cover 2, without, however, resul¬ ting in a rigidly openable and therefore readily breaking construction. The manufacture of the soft-cover book block shown in Fig. 1 takes place so that first,glue is applied as hot onto the spine portion 5 of the soft cover so that the application of glue extends somewhat beyond the spine edges 11 of the spine portion 5. The width of the glue is, however, somewhat narrower than the width of the sleeve shown in Fig. 2 when the sleeve is fully compressed, i.e. somewhat narrower than the distance between the folds 13 and 13'. Hereupon glue is applied either as hot or as cold over the entire "&TJREA^ width of the book block 1 and slightly beyond its spine edges 12. The width of the glueing is, however, prefer¬ ably slightly narrower than the width of the compressed sleeve shown in Fig. 2, i.e. than the distance between the folds 13 and 13' of the said sleeve. Finally, the sleeve 3 fixed by glueing onto the cover 2 is fastened by glueing onto the book block 1. The sleeve 3 is made of some elastically flexible material, such as paper, plastic, or crepe non- penetrable by glue. Besides by means of glue-binding, the book block may also be prepared by thread-stitching. It is evident that, in addition to this, a separate supporting crepe may be fastened onto the spine of the book block in a way in itself known, whereby the book block is fastened to the sleeve by means of this supporting crepe. Likewise, it is evident, even though not particularly advantageous, that the circuit of the sleeve, especially when a supporting crepe is used, is at the maximum twice the thickness of the spine of the book bloqk. It is equally evident that the sleeve may be fastened first to the book block and the cover be fastened only thereinafter onto the sleeve fixed to the book block. Finally, it should still be stated that, in stead of one sleeve, it is of course possible to use two or more sleeves placed side by side and/or one after the other, the said sleeves being either in contact with each other or at a distance from each other.

Claims: WHAT IS CLAIMED IS: - _ 1. A soft-cover book block, which comprises a book block (1) consisting of leaves and/or sheets 5 joined togehter at their spine edges, a soft cover (2) . fastened to the book block, as well as a member for fastening the soft cover to the book block so that the spine part (5) of the cover is apart from the spine part (4) of the book block, c h a r a c t e r i z e d 10 in that the fastening member consists of at least one sleeve (3) , whose circuit is preferably at least twice the width of the spine (4) of the book block (1) and whose length is preferably equal to the height of the spine of the book block and which is, at one side, 15 fastened to the spine part (4) of the book block (1) and, at the opposite side, to the spine part (5) of the cover (2) . 2- A soft-cover book block as claimed in ■ claim 1, c h a r a c t e r i z e d in that the circuit 20 of the sleeve (3) is somewhat larger than twice the width of the spine (4) of the book block (1), so that the sleeve (3) extends some distance between the first leaf (6) and the front cover (8) of the book block (1) and between the last leaf (7) and the back cover (9) of 25 the book block. 3. A soft-cover book block as claimed in claim 2, c h a r a c t e r i z e d in that the sleeve (3) is fastened, besides over the entire width of the spine part (5) of the cover (2) and of the spine (4) of 30 the book block (1) , also a certain distance beyond the spine edges (11, 12) of the cover (2) and/or of the book block (1) , however, preferably not right up to the fold (13, 13') of the sleeve (3) between the front cover (8) and the first leaf (6) and between the back 35 cover (9) and the last leaf (7) , so as to provide flexible fastening (10) between the front cover (8) and the first leaf (6) and between the back cover (9) and OMPI the last leaf (7) . - _ 4. A method for the manufacture of a soft- cover book block by glueing the soft cover (2) onto the book block (1) by means of a separate fastening member non-penetrable by glue so that the spine part (5) of the cover (2) is apart from the spine (4) of the book block - (1), c h a r a c t e r i z e d in that a sleeve-shaped flexible fastening member (3) , whose circuit is prefer¬ ably at least twice the width of the spine (4) of the book block (1) and whose length is preferably equal to the height of the book block (1) , is first fastened to the spine part (5) of the cover (2) and that the book block (1) is thereupon fastened by its spine part (4) to the sleeve-shaped flexible fastening member .(3) fixed to the cover (2) . 5. A method as claimed in claim 4, c h a r ¬ a c t e r i z e d in that the glueing of the sleeve- shaped fastening member (3) onto the cover (2) is extended a certain distance beyond its spine edges (11) onto the front and back cover (8, 9). 6. A method as claimed in claim 4 or 5, c h a r a c t e r i z e d in that the glueing of the book block (1) onto the sleeve-shaped fastening member (3) is extended a certain distance beyond the spine edges (12) of the book block (1) onto the 'first and last leaf (6, 7) . 7. A method as claimed in claim 4, 5 or 6, c h a r a c t e r i z e d in that between the cover and book-block glueings of the sleeve-shaped fastening member (3) , narrow glue-free strips are allowed to remain so as to form resilient portions (10) between the front cover (8) and the first leaf (6) and between the back cover (9) and the last leaf (7) .

Inventors: SALLINEN PENTTI
Applicants: SALLINEN PENTTI
Application year: 1982
Main classification: B42D1
IPC codes: B42C9, B42C11, B42D1