Adjust the thickness of the cover. In general, it is best to use cover paper of more than 230g for more than 200 books. 2. It can be solved by adjusting the height of the water platform and lowering the water platform appropriately. Similarly, if the spine of the bound book is not square, it can be solved by raising the surface platform a little. The function of the binder is to bind the semi-finished booklets, put a certain number of booklets on the binder, quickly block the two ends of the booklets with boards, then start the binder to press the loose booklets tightly, and then bind them with ropes. Glue binding machine: bind the semi-finished books, put a certain number of books on the binding machine, and quickly block the two ends with plates. Start the binder, press the loose books tightly, and then bind them with a rope.