それぞれの糸を撚る
https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1230939282
混紡と製糸
https://ja.m.wikipedia.org/wiki/%E7%B4%A1%E7%B8%BE
https://www.l-m.co.jp/dictionary/mixed-spinning/
https://blog.goo.ne.jp/jizaiyasakurako/e/cee850c631f262900c523eb17587ac80
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