In which dynasty did thread-bound books begin?

Thread-fitting, also known as ancient thread-fitting. Some people think that there are thread-bound books for sale in the book market in Han Dynasty. In fact, there was a book market in the Han Dynasty, but there were no thread-bound books.

The ancient paper books in China experienced two stages: scroll and album. The reel consists of coils, shafts, ribbons and belts. There were only books in this scroll form in the Han and Tang Dynasties. Today, we see scroll paintings hanging on the wall, or the legacy of scroll mounting. After the late Tang Dynasty, scroll books were transformed into album books, and their binding methods evolved into various ways, such as light folding, whirlwind, butterfly, and northern packing. It was not until the Ming Dynasty that the thread-bound book officially appeared. Many of these ancient thread-bound books can be regarded as cultural relics and are very precious.