Protective encasements applied to the exterior of books housed in libraries. These transparent sheets, typically made of polyvinyl chloride or polypropylene, are adhered to the book’s cover to shield it from damage due to handling, spills, and general wear and tear. An example includes a clear, durable film affixed to a frequently circulated hardcover novel in a public lending institution.
The application of these protective layers is integral to preserving the longevity and aesthetic appeal of a library’s collection. This proactive measure minimizes the need for costly repairs or replacements, thereby optimizing resource allocation. Historically, these coverings evolved from simple paper jackets to more sophisticated plastic films as material science advanced and the demand for durable preservation methods increased.