Enclosed (enclosed) - Enclosed

Japanese: 袋とじ(袋綴) - ふくろとじ

A method of binding books. The paper is folded so that the writing and printing sides, that is, the front side, are on the outside and the back side (white) is on the inside, and then bound with string at two points, top and bottom, along the seam on the opposite side of the fold. The name "enclosed binding" comes from the fact that each sheet becomes like a bottomless bag. Therefore, the way the paper is folded and the seams are reversed from those of detsuyo binding. Japanese-bound books usually have four or five folds, with four folds being the Chinese style and five folds being the Korean style. Enclosed binding is said to have begun in the early 14th century during the Yuan dynasty in China, but after the Wanli period of the Ming dynasty (1573-1619), a similar binding method of binding with thread became popular.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

書物装丁法の一つ。書写面･印刷面，すなわち表面が外側に，裏面〈白〉が内側になるように折り込み，折り目とは反対側の用紙合わせ目に沿って，上下2ヵ所をこよりでとじるもので，形態的には一紙一紙が底ぬけの袋状になるところから袋とじの称がある。したがって粘葉（でつちよう）装とは用紙の折り方，接合部が逆になる。和装本のとじ目は四つ目か五つ目が通例で，四つ目は中国風，五つ目は朝鮮風である。袋とじは中国元代の14世紀初めころからはじまったといわれるが，明代の万暦期(1573‐1619)以後に，同様のものを糸とじする装丁法が流行した。

出典　株式会社平凡社世界大百科事典第２版について　情報

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