Post-press processing technology - butterfly packing
In a nutshell, the butterfly binding is to fold the paper with the text face inward, and then align all the page numbers with the middle seam, paste it with adhesive on another pack of backing paper, and then cut it into a book. Because the finished book looks like a butterfly with wings ready to fly from the side when opened, the image is called a "butterfly suit"
Butterfly binding is also one of the forms of ancient Chinese book binding. After the advent of engraving and printing books, especially after the prevalence of engraving and printing books in the Song Dynasty, due to the changes in the mode of book production, the method and form of book binding also changed accordingly. Engraving is different from handwriting or copying books. Writing or copying books can be written down one by one without any restrictions. They are then joined, rolled up to form a reel, or folded to become a warp fold. Engraving books are subject to layout restrictions, that is, each edition can only engrave a certain number of lines, and there are usually sidebar boundaries. The leaves printed in this way are all single leaves in the unit of plates. If this kind of book leaf is still bound in scrolls or folded, it is necessary to glue the leaves end to end, and try to remove or cover the left and right sidebars of each leaf, which is time-consuming and extremely inconvenient. So to adapt to the characteristics of engraving and printing, the butterfly costume was created.
The butterfly suit, also known as the "sticky page", is an early album suit. The butterfly costume appeared after the warp fold and evolved from the warp fold. In the process of reading the folded books for a long time, the folds of the folded books are often broken, and after the breakage, there is a situation of one page and one page. And the first album book to appear was "butterfly suit".
Butterfly outfit is also called butterfly hardcover, mostly used in recipes, costume books, photo books, commemorative books, etc., can be unfolded 180 degrees, firm and durable, convenient for long-term preservation and many times to read, the disadvantage is that it is heavier, and the production cost is high.