A good hardcover book is not obtained by accident. During the production process, the quality of each process needs to be strictly checked until the final process product quality is fully qualified.
The shell is square, no stains, no pattern marks, no wrinkles, no blistering, no damage, the ridge is divided into the middle, the length of the plug cloth is the same as the thickness, and the arc of the round ridge is generally larger than the book The thickness of the book is 5-6mm, and the curvature of the spine is commensurate with the curvature of the book opening.
The inner lining paper is in the same position as the three sides of the leather case. The book block is generally 3mm smaller than the leather case. It is not skewed. The spine and the book edge are flat. The square spine does not appear to be flared, cut or cut. The book block and the center of the leather case There is no drop in the position of the strips, no glue leakage from pinholes, no broken threads, loose threads, stains, no large or small pages, disordered page order, and the glue height between the post and the post is 1 to 3mm, and there is no empty glue or false sticking.