Butterfly binding

Japanese: 粘葉装 - でっちょうそう（英語表記）butterﬂy binding

It is pronounced "detchosou." It is a type of binding method for Japanese and Chinese books, in which a printed or copied piece of paper is folded in half with the characters facing inward, glue is applied to the outside of the fold near the spine of each piece of paper, and the pieces are then attached to a cover. Some covers are wrapped in a single continuous piece of paper, while others wrap only the spine in a separate piece of paper or silk, and then have separate covers for the front and back. It is characterized by the fact that it is finished using only glue, without using any thread or string. In nechosou, there are two blank pages next to the two pages with characters. In China, it is a typical binding method from the Song dynasty. In Japan, it is seen in manuscripts and woodblock prints from the Heian to Kamakura periods, but because thicker paper is used than in China, both the front and back of the paper are often written or printed on. Because the papers are glued together near the spine of the fold, when the book is opened it looks like a butterfly with its wings spread, and so in China this binding method is called kochosou.

Source: Dictionary of Library and Information Science, 4th Edition Dictionary of Library and Information Science, 5th Edition About Information

Japanese:

「でっちょうそう」と読む．和漢書の装丁法の一種で，印刷または筆写された紙を，字面を内側にして二つ折りし，各紙の折目の外側の背に近い部分に糊を付けて相互に密着させていき，それに表紙を加えたもの．表紙は前後を続けて1枚で包んだもの，また，背のみ別紙や絹で包み，前後各別に表紙を加えたものもある．糸も紐も用いずに糊だけで仕上げるのが特徴である．粘葉装では字面のある見開き2ページの次には，白紙の部分が見開き2ページ分くることになる．中国では宋代の代表的装丁法である．日本では平安時代から鎌倉時代の写本や版本に見られるが，中国に比べて厚手の紙が使用されるので，紙の表裏ともに書写または印刷されることが多い．折りの背に近い部分で紙が相互に貼り合わされているため，本を開くとき蝶が羽を開いたような形になるので，この装丁法を中国では胡蝶装と呼ぶ．

出典　図書館情報学用語辞典第4版図書館情報学用語辞典第5版について　情報

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