By-product silk

Japanese: 副蚕糸 - ふくさんし（英語表記）by-product silk

A general term for waste materials such as the threads generated during reeling, the inner layer of the cocoon (pupal skin), and cocoons that have lost their threads during reeling. The main types are kibiso and bisu. Kibiso is made by collecting the threads that are removed with a thread broom to find the reeling opening, washing them in water, and drying them. Hisu is made by removing the pupa from a thin-skinned cocoon (pupal skin) and drying it. The relatively long kibiso are called noshiito, and all of these are used as raw materials for silk spinning. The production of secondary silk threads has been declining due to advances in silk-reeling technology, and the amount of secondary silk threads produced per bale of raw silk is about 10 kg, of which 56% is hisu and 33% is kibiso.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

繰糸するとき生じる緒糸，繭の内層 (蛹肌) ，繰糸中に正緒を失った揚がり繭など屑物の総称で，生肌苧 (きびそ) ，比須 (びす) がおもなもの。生肌苧は繰糸するとき繰り口を捜すために緒糸ほうきですぐり取った緒糸を集めて水洗，乾燥させたもの。比須は薄皮繭 (蛹襯〈ようしん〉) の蛹を除いて乾燥したもの。生肌苧のなかで比較的長いものは熨斗糸 (のしいと) といい，これらはすべて絹紡績の原料になる。副蚕糸の生産量は製糸技術の進歩によって減少傾向にあり，生糸1俵あたりの副蚕糸の出量は 10kg程度で，その 56%は比須，33%は生肌苧である。

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