Hybrid bindings Binders have always developed special methods. One important idea of recent years has been the paperback whose block is held away from the cover sheet. The potential virtues of the paperback and the hardback are thus retained: a soft cover and spine that does not have to undergo the book-block’s flexing out. In Europe, one such method was invented by the Finnish company Otava, the large publishing and printing firm that dates originally from 1890, when it was founded as a vehicle to aid the emerging Finnish national spirit. Otava came to develop its own binding method for schoolbooks, which needed to be both cheap in materials and to lie open easily on tables and desks. The book-block is fixed to a thin sheet of paper, which in turn is fixed at its sides to a cover, which is scored at least twice on each side. This technique has come to be known as Otabind. In the 1980s Otava granted a non-monopoly license in this method to the Dutch binder Hexspoor, whose factory was situated in Boxtel in the south of the Netherlands. Hexspoor was then run by Gerard J.P.M.T. Hexspoor, who had taken over the firm from his father, who had founded the company in 1946. For a time Hexspoor named the method ‘Hextrabind’. But when it came to exploting the license overseas, Gerard Hexspoor formed a new company, Otabind International. The Otabind patent consisted in a description of the method. Müller Martini, the Swiss manufacturer of binding machines, had helped Otava develop the method and now worked together with Hexspoor in its wider application. From a booklet published by Otabind International BV for Drupa 1995 These patents ran for only 10 to 20 years, so the Otabind method is now free for use by any binder open to designing and installing the plant needed to achieve it. At the same time as Hexspoor was exploiting the Otabind idea, in North America a very similar method was developed, principally by Werner Rebsamen, and marketed there. This variant, which added a strip of cloth around the book-block, was given the trade name RepKover (standing for ‘reinforced paperback cover’). Otabind is not in itself a desirable binding method. Adhesive is still the crucial factor. Otabind with the pages cold-glued (perfect-bound or sewn) will always work much better than Otabind with hotmelt. So too a cold-glued paperback (perfect-bound or sewn) has these advantages over Otabind with hotmelt.

Hardbacks and paperbacks The book trade distinguishes severely between hardbacks and paperbacks; though the truth is that each comes in all manner of forms. A well-made paperback is preferable to a poorly constructed hardback. And in its materials and processes, such a paperback may cost more to make than the poor hardback (yet is expected to sell for less than half the price of the latter). The advantage of a hardback – apart from its thicker, harder, more durable covers – is that the book-block is held apart from the back of the cover. So the block has an easier time when it is opened out: there is no back to constrain it, or to become creased. A cold-glued, thread-sewn block inside hard covers can become a wonderfully easy mechanism. A paperback has paper covers that are glued to the block of the book. So when the back of the block is opened, the covers have to open too. This is the moment for cold glue to do its business: hold the pages together strongly and flexibly. Over time and with use, creases will appear in the spine of the paperback. This is life – it is what happens when goods are used. Creases in a spine are a sign of a book that has been worth reading and consulting. A further possible objection to cold glue arises here. In a cold-glued paperback with sewn sections, the points at which the threads are sewn together, at regular intervals down the spine, form a succession of small ridges, which can be felt as one runs a finger down the outside of the spine. Again, lovers of smoothness above everything may not like this. Others will not notice, or will even find it pleasant to feel the construction beneath the skin.

Adhesive The nature of the adhesive is a fundamental factor in successful opening. Broadly, two kinds of adhesive are used in present-day book production: water-based glues and plastic materials. Almost invisible cold glue on a paperback. (Wilhelm Busch, Max und Moritz, Zurich: Diogenes, 1974) Glueing with water-based adhesives – known in English as ‘cold glue’ – is the older method. The material is liquid already in its cold state. With this material, the job can be done with only a very thin layer of glue – minimal thickness is itself an advantage – and these glues are flexible and durable. They take 24 hours to dry, and production will have to be halted for this. PVA (polyvinyl acetate) is another name for this category of adhesive. A thick layer of unyielding hotmelt on a paperback. (Terry Eagleton, Against the grain, London: Verso, 1986) Glueing with plastic materials that are heated to become fluid is often termed ‘hotmelt’ (in English and now other languages). The process goes fast, and drying is almost instant. This speed is the obvious appeal of the process. But these adhesives are less flexible than a water-based glue. The thicker the layer of adhesive on a spine, the more resistant it will be to opening. The more pages in a book, the less this may matter. But even a 400-page book, its sections held together with threads and a layer of hotmelt adhesive, will not open as well as a cold-glued book. PUR (polyurethane reactivate) constitutes another category of adhesive. Like hotmelt materials, it comes in a solid state and is then heated before application. PUR bindings may need a thinner layer of adhesive to hold the pages, but their ‘stay open’ qualities are not better than hotmelt, and they are said to suffer from the emission of toxic vapours when heated. Wreckage from the 1970s: a hotmelt paperback with a broken spine. (Francis D. Klingender, Art and the industrial revolution, St Albans: Paladin, 1972 [1975 reprint]) The hotmelt plastics have been improved over the years. One can find vivid examples from the 1970s (when the process became prevalent in western Europe and North America) of books whose adhesives quickly hardened and then split wherever they were firmly opened. By contrast, one can find cold-glued spines from long ago that still open, and stay open, perfectly. Their paper may now be browned and mottled, but the book-machine functions as well as it always did. Much of book production now runs without access to cold glue. Apart from hand or ‘craft’ binders, it has disappeared from use by binders in North America, the UK, and much of continental Europe. When asked to use cold glue, a printer or binder – if they still have access to it – will say that it isn’t suitable for books that are printed on coated paper. The thin fluid may seep through the holes of the threading needles and form a pool inside a section, or between two sections, which, when dry, then pulls away a patch of the paper when the pages are opened out. This has happened since coated paper was invented and may be a problem for fetishists who live only for the perfectly smooth finish, and don’t actually use or read books.

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