Case binding is the most common type of hardcover binding for books. The pages are arranged in signatures and glued together into a "textblock." The textblock is then attached to the cover or "case" which is made of cardboard covered with paper, cloth, vinyl or leather. This is also known as cloth binding, or edition binding.

https://en.wikipedia.org/wiki/Bookbinding

Capa de livro pode ser considerada, juntamente com a Lombada, uma cobertura protetora que une as páginas de um livro,

https://pt.wikipedia.org/wiki/Capa_de_livro

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Note added at 7 days (2018-09-13 01:46:02 GMT) Post-grading
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De nada, é um prazer. :-)