Do the books of the Song Dynasty have thread-bound editions?

No, anyone who knows the history of China's book system knows that it was impossible to install it with wires in the Song Dynasty. From the large-scale use of paper in the Wei and Jin Dynasties, China's books were all bound in scrolls, which evolved into the handwritten scroll (four tones) in the calligraphy and painting table. Its characteristic is that the words are written in sequence from beginning to end, and it is very troublesome to find the words behind, which is a drawback. There were some improvements in the Tang Dynasty, such as whirlwind and Longlin. Whether they are one binding mode or two binding modes has always been controversial. However, the Palace Museum has the only binding book of Longlin in China, which is characterized by dividing the pages into single pages and sticking them on a piece of base paper in sequence. This method is more convenient to load than the scroll, but the disadvantage is that it is not easy to find, and the page is easy to curl after repeated winding, which is very inconvenient. Later, there was folding, which was called folding because it was widely used in Buddhist scriptures. This binding method was popular in the Tang and Five Dynasties, and was later replaced by Butterfly Biography, but it has been used in Buddhist scriptures, memorials and other fields. Butterfly costume appeared in the Northern Song Dynasty, which is characterized by folding the original single page in half, the words facing inward, then folding it flat, fixing the folded part with paste, covering it, and making it into a book, similar to modern paperback books. Because the pages are relatively separated like butterflies when they are opened, they are named butterfly clothes. However, butterfly clothes also have disadvantages, because the pages are folded inward and often turn to blank pages after binding, so Bao Beizhuang appeared at the end of the Southern Song Dynasty, while Bao Beizhuang, on the other hand, folded the pages outward with words on them, and the outside two pages were stuck on the back of the book. But this is still inconvenient, so I punched several holes in the back of the book and twisted it with paper to pave the way for later thread-bound books. In addition, Bao Beizhuang's book cover is a whole, and the back of the book is also wrapped. Thread-fitting is a common form, which began to appear in the middle of Ming Dynasty. With the evolution of packaging, two independent cover lines are used to fix books. Because the back of Bao Beizhuang's book is easy to wear, it can't be leveled by rubbing paper alone when repairing, and the corners are easy to tilt, so this method is adopted. To sum up, the books in Song Dynasty have no thread binding.