backing

Preferred label: 

The process of creating backing joints usually to accommodate the boards of a book. Backing joints can come in a variety of shapes (quadrant, slight, square, angled). The process of backing can be carried out either by lacing the boards on tightly and pulling them shut or by means of a backing hammer applied to a bookblock locked up in a press.

Etherington & Roberts (1982)

Roberts, Matt, Don Etherington, and Margaret R. Brown. 1982. Bookbinding and the conservation of books: a dictionary of descriptive terminology. Washington: Library of Congress.

Additional reference: 
http://cool.conservation-us.org/don/dt/dt0198.html (modified)

AAT

The Arts and Architecture Thesaurus Online, The Getty Research Institute.

Additional reference: 
http://vocab.getty.edu/aat/300261405
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Broader concept: 
Top concept: 
techniques