Patent GB-424774-A (GB)
Title: Improvements in or relating to bookbinding
IPC: B42C19/06
Filed: 1933-08-23
Abstract: 424,774. Bookbinding. FORTIER, A. A., 9, Rue Edouard Jacques, Paris. Aug. 23, 1933, Nos. 23487 and 23488. Convention dates, Oct. 14, 1932 and June 15, 1933. [Class 16] A cover for binding books, ledgers, and the like is made of rubber or rubber composition, and has two board portions integral with a back portion, and flexible longitudinal portions provided between the back and the boards to permit opening and closing of the boards. The flexible longitudinal portions may be obtained by thinning the material of the cover at these positions, or if the cover is vulcanized, by omitting to vulcanize at these positions, or by both thinning and omitting vulcanization. The covers are preferably made from a web or rubber or rubber composition, and may be embossed, goffered, printed, painted, or otherwise decorated; the covers may also be decorated by a moulding process. The composition of the covers may comprise 50 parts of raw rubber, 1À5 parts of sulphur, 1À5 parts of a plastifying agent, 16À5 parts of mineral fillers and pigments, 30 parts of cellulose, and 0À5 part of an accelerator. In the cover shown in Fig. 2 the flexible longitudinal portions 5 are obtained by omitting vulcanization at these positions, and the boards 1 are slit to provide inner flaps 10 for the reception of gummed fabric side extensions or flaps provided on the book. Various shapes of covers are described and shown, some having the boards and backs of the same thickness, others having thinned backs. In one form the cover is made from a thin piece of rubber with extended board portions which are folded over and subsequently vulcanized to form boards of twice the thickness of the back. In another form the boards are recessed adjacent the back, and slits are provided therein for the reception of bands or straps provided on the book, the recesses being filled up afterwards to hide the straps. The above-described covers may be made from a single web of rubber or rubber composition which is drawn through a calendering-machine, cut to the exact width by cutting-wheels, passed through a profiling or embossing machine where it is roughly profiled, and then wound on a spool; preferably the successive layers on the spool are separated by a web of other material. Several such spools are then placed near the inlets of a vulcanizing-press comprising heated profiling or embossing plates, or heated engraved cylinders, and the webs of rubber or rubber composition are fed therethrough. The webs are then cut up into separate book covers, or, where a printing operation is necessary, are wound on to further spools, passed through a rotary printing- machine, and then cut up into book covers. The book cover shown in Fig. 16 comprises a base portion C, a band 11 of cloth, transparent or other paper, &c., along the centre of the base portion, and separate pieces 10 of rubber or rubber composition superimposed over and vulcanized to the board portions of the base. The cloth &c. 11 is turned over at its edges 12, and the portions of the pieces 10 which overlap the edges 12 are left free. The lined flaps and back of the cover then receive flaps or extensions provided on the book. These covers are made by passing a web of rubber or rubber composition through a calendering-machine, cutting it to the exact width by cutting-wheels, lining it along the centre with a web of cloth &c., having overturned edges and drawn from a roll, superimposing thereon two further webs of rubber or rubber composition also drawn from a roll, and rewinding the composite web on a roll together with a separating web. The composite web is then vulcanized in either a heated plate or cylinder press.