Book manufacturing in the modern world

Book manufacturing in the modern world
Main article: Bookbinding
The spine of the book is an important aspect in book design, especially in the cover design. When the books are stacked up or stored in a shelf, the details on the spine is the only visible surface that contains the information about the book. In stores, it is the details on the spine that attract buyers' attention first.

The methods used for the printing and binding of books continued fundamentally unchanged from the 15th century into the early years of the 20th century. While there was of course more mechanization, Gutenberg would have had no difficulty in understanding what was going on if he had visited a book printer in 1900.

Gutenberg’s “invention” was the use of movable metal types, assembled into words, lines, and pages and then printed by letterpress. In letterpress printing ink is spread onto the tops of raised metal type, and is transferred onto a sheet of paper which is pressed against the type. Sheet-fed letterpress printing is still available but tends to be used for collector’s books and is now more of an art form than a commercial technique (see Letterpress).

Today, the majority of books are printed by offset lithography in which an image of the material to be printed is photographically or digitally transferred to a flexible metal plate where it is developed to exploit the antipathy between grease (the ink) and water. When the plate is mounted on the press, water is spread over it. The developed areas of the plate repel water thus allowing the ink to adhere to only those parts of the plate which are to print. The ink is then offset onto a rubbery blanket (to prevent water from soaking the paper) and then finally to the paper (see Lithography).

When a book is printed the pages are laid out on the plate so that after the printed sheet is folded the pages will be in the correct sequence. [see Imposition] Books tend to be manufactured nowadays in a few standard sizes. The sizes of books are usually specified as “trim size”: the size of the page after the sheet has been folded and trimmed. Trimming involves cutting approximately 1/8” off top, bottom and fore-edge (the edge opposite to the spine) as part of the binding process in order to remove the folds so that the pages can be opened. The standard sizes result from sheet sizes (therefore machine sizes) which became popular 200 or 300 years ago, and have come to dominate the industry. The basic standard commercial book sizes in America, always expressed as width × height in USA; some examples are: 4¼” × 7” (rack size paperback) 5⅛” × 7⅝” (digest size paperback) 5½” × 8¼” 5½” × 8½” 6⅛” × 9¼” 7” × 10” 8½” × 11”. These “standard” trim sizes will often vary slightly depending on the particular printing presses used, and on the imprecision of the trimming operation. Of course other trim sizes are available, and some publishers favor sizes not listed here which they might nominate as “standard” as well, such as 6” × 9”, 8” × 10”. In Britain the equivalent standard sizes differ slightly, as well as now being expressed in millimeters, and with height preceding width. Thus the UK equivalent of 6⅛” × 9¼” is 234 × 156 mm. British conventions in this regard prevail throughout the English speaking world, except for USA. The European book manufacturing industry works to a completely different set of standards.





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