How to identify hardcover books？
Usually, there is a flexible spine stitched so that the book can be flat against the table top when it is opened. Nowadays, the spine of the book is usually made of adhesive instead of traditional sewing. Hardcover books are mostly printed on acid-free paper, and are more durable and longer-lasting than paperback books, but they are more expensive and more expensive. Hardcover books are generally accompanied by exquisite protective seals.
There is a sense of weight when holding the book, the book groove is obviously concave, there is no squeaking sound on the leather shell surface 180° before and after flipping, and the leather shell surface book groove and the backing paper appear falsely sticking.
Except for the quality of binding related processes, both ends of the hole must be centered, the hole must be flush, without burrs, the closing position is 1mm, and the iron wire should not exceed the book block. In this way, there is no lack of simplicity in modern aesthetics, but also the exquisiteness of modern craftsmanship.