Stiffening
Encyclopedia
In bookbinding
Bookbinding
Bookbinding is the process of physically assembling a book from a number of folded or unfolded sheets of paper or other material. It usually involves attaching covers to the resulting text-block.-Origins of the book:...

, stiffening is a process whereby paperback books are reinforced for use in libraries, without change to their fundamental binding structure. It is in use at several academic libraries in the United States, including those at Cornell University
Cornell University
Cornell University is an Ivy League university located in Ithaca, New York, United States. It is a private land-grant university, receiving annual funding from the State of New York for certain educational missions...

 and Johns Hopkins University
Johns Hopkins University
The Johns Hopkins University, commonly referred to as Johns Hopkins, JHU, or simply Hopkins, is a private research university based in Baltimore, Maryland, United States...

.

During the stiffening process, a cloth or Tyvek
Tyvek
Tyvek is a brand of flashspun high-density polyethylene fibers, a synthetic material; the name is a registered trademark of DuPont. The material is very strong; it is difficult to tear but can easily be cut with scissors or a knife...

 strip is glued down on the inside joints of a paperback to reinforce the attachment of the book's covers. A thin but stiff board is then glued to the inside of both the front and back cover of the book, and the entire book is trimmed slightly on the head, tail, and fore edge, often with an electric guillotine.

Stiffening provides an in-house, inexpensive alternative to commercial library binding
Library binding
Library binding is the term used to describe the method of binding serials, and re-binding paperback or hardcover books, for use within libraries. Library binding increases the durability of books, as well as making the materials easier to use...

for paperbacks. While it does not involve (re-)sewing a book as in a library binding, stiffening does significantly prolong the usable life of a paperback, and allows paperbacks to stand upright on library shelves. The stiffening process was invented in 1974 by John Dean, who was Head of Preservation at Johns Hopkins at the time.
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