2.
Repair the corners of the book mouth. The corner of the book mouth, whether it is the cover or the inner page, is most likely to curl, fold and break. The repair method is to use your hands first. ...
3.
Repair broken pages. If the page is torn, but there is no shortage of "meat", you can put a piece of wax paper under the torn part, then align the cracks and color them. ...
4.
Repair the fallen inner page. If the inner page falls off the binding line, you can apply a layer of glue to the binding edge of the fallen page half a centimeter.