Covering with ready-to-coat film protects the paper.Covering can prolong the service life of the cover (or the printed surface), especially for the student textbook category, so it is used more and more.The marks are not easily destroyed.The ready-to-coat coating can increase the color effect and protect the color printed pictures without abrasion.This facilitates the publisher's art editors to create various art designs on the cover or on the surface of the print according to their needs, and thus also promotes the increase in usage.