Book binding glossary: 40 terms, illustrated.

Signature (section)

A folded section of pages, commonly 16 or 32 in commercial book production. The section size depends on the format, paper and folding scheme.

Leaf

One physical piece of paper in the book, carrying two pages, one on each side.

Recto and verso

In the left-to-right book shown here, recto is the right-hand, odd-numbered page and verso is the left-hand, even-numbered page.

Gutter

The inner margin, where the page curves into the binding and careless artwork goes to disappear.

Text block (book block)

The assembled body of a book’s pages, before its cover is attached. It may consist of folded signatures or individual leaves, depending on the construction.

Gathering

Collating folded signatures into order; the step where a sequence error becomes a very memorable book.

Endpapers (endsheets)

The folded sheets joining a hardcover block to its case, half pasted down, half flying free.

Hinge

The flexing line inside the cover where the book actually opens.

For your quote: Confirm the page-count increments and whether endpapers are included in the quoted extent.

Smyth sewing (section sewing)

Machine sewing that joins folded signatures through their folds and to neighbouring sections; a common construction for books intended for repeated use.

Side sewing

Thread passes through the thickness of the book block near the spine edge. It makes a secure attachment but restricts opening more than through-fold sewing.

Saddle stitch

Wire staples through the fold of nested sheets; the binding of thin catalogs and picture books.

Sewn paperback

A section-sewn text block finished with a soft cover. Sewing and cover construction are separate specifications.

Mull

Open-weave cloth glued along the spine to reinforce the book block; also called super or crash.

Spine lining

Paper, cloth or other layers applied to prepare and reinforce the spine. The materials and arrangement depend on the binding construction.

Swell

The extra thickness thread adds at the spine; managed, never quite eliminated.

Smashing

Pressing sewn blocks flat under high force so the swell behaves; the trade never renamed it.

For your quote: Specify how the pages are joined as well as whether the cover is hard or soft.

Perfect binding

An adhesive binding in which prepared page edges are bonded at the spine and attached to a wraparound soft cover; a common paperback construction.

Milling

Grinding the folds off a gathered block so glue can reach every individual page edge.

EVA

Ethylene-vinyl acetate hot-melt adhesive, which sets as it cools. Widely used for economical everyday binding; suitability depends on the paper, printing and intended use.

PUR

Polyurethane-reactive adhesive that cures with moisture. Often chosen for demanding papers and durable adhesive bindings; performance and curing requirements depend on the formulation and production conditions.

Notch binding

A compromise that keeps the folds and cuts glue channels into them instead of milling.

Lay-flat binding

A broad term for constructions intended to let a book remain open with little resistance. Otabind is one softcover example, with the text-block spine free from the cover spine. Confirm opening behaviour with a sample.

Wire-O (twin-loop wire)

Paired steel loops closed through punched holes; pages align level across the spread.

Spiral coil

One continuous plastic or metal helix threaded through punched holes. Plastic coil is flexible and lets pages turn around the binding; protect it during packing and shipping.

For your quote: Name the opening requirement and let the printer confirm an adhesive suited to the paper and process.

Case

The hard cover as a separate manufactured object: two boards and a spine piece under one covering.

Binder's board

The dense board inside a hardcover. Its thickness and stiffness should suit the book’s format and construction.

Book cloth

Fabric prepared for covering books, often paper-backed or otherwise treated to improve handling and control adhesive penetration. The weave and finish affect foil and other decoration.

Turn-in

The covering material wrapped over the board edges to the inside, later hidden by the endpapers.

Square

The small lip of case overhanging the block on three sides, standing guard over the pages.

Joint

The pressed groove beside the spine that lets a heavy case open without fighting the board.

Rounding and backing

Shaping a sewn spine into a curve and forming shoulders to accommodate the boards; a construction choice for round-backed books.

Casing in

Marrying block to case with pasted endpapers; the moment a book becomes a book.

For your quote: Confirm the board, covering material and endpaper stock together.

Headband

A small band at the head of the spine, often matched by a tailband at the foot; together, endbands. In modern trade books these are usually applied decorative components, not evidence that the text block is sewn.

Ribbon marker

The bound-in bookmark, anchored under the spine lining rather than glued to a page.

Dust jacket

The printed, removable wrap around a hardcover, its flaps tucked around the boards.

French flaps

Jacket-style flaps folded into a paperback cover; a softcover borrowing hardcover manners.

Lamination

The thin film, gloss, matt or soft-touch, that protects a printed cover.

Foil stamping

Metallic or pigment foil pressed into the cover with a heated die.

Blind deboss

A design pressed down into the cover surface without foil or ink. It is recessed; embossing raises the design above the surrounding surface.

Sprayed edges

Color, gradients or stencilled artwork applied to the trimmed edges of the block.

For your quote: List each finish and its location; send a reference image for a combined effect.