Insert paper - Nyuushi

Japanese: 入紙 - にゅうし

When the paper of a book bound in a closed binding is weak or damaged by insects, new paper is inserted between the pockets of the main text to reinforce it. To insert paper, the binding threads are first removed and the book is disassembled, then paper slightly larger than the original is inserted, and a cover of the same size is attached and the book is rebound. It is said to have developed mainly in China, where waste paper is sometimes used for the inserted paper, which is said to have led to the discovery of rare documents. Similarly, the book is disassembled, each leaf is spread out, and thin, flexible paper is glued to the backside before being rebound, which is called "backing," but because glue is used, care must be taken to prevent insect damage.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

袋綴の本の用紙が弱かったり，虫害などで損傷した場合に，本文の袋の間に新しい紙を挟み入れて補強すること。入紙を施すには，まず綴糸を抜いて本を解体してから，原本よりも少し大きい紙を挿入し，同大の表紙をつけて綴じ直す。おもに中国で発達したといわれ，中国では挿入する紙に故紙を用いることがあり，そこから珍しい資料が発見されることもあるという。また同様に解体して各葉を広げ，裏面に薄くて柔軟な紙をのりで貼りつけてから綴じ直すことを〈裏打ち〉というが，のりを用いるために虫害に注意しなければならない。

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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