Cocoon filament size

Japanese: 繭糸繊度 - けんしせんど（英語表記）size of cocoon filament

This refers to the thickness of the cocoon thread. The unit of measurement is denier (abbreviated as d). The outer layer of the cocoon is the thickest, and the thickness decreases in the order of the middle and inner layers, but the cocoon thread fineness usually indicates the average value. This value is calculated from the length of raw silk obtained by reeling a certain amount of cocoons, the amount of raw silk, and the average number of grains. The fineness of cocoon thread varies depending on the silkworm variety, silkworm season, and rearing conditions, but the thickness of cocoon thread produced by silkworms currently commonly reared is often 2.5 to 3.5 d. Looking at the different varieties, Japanese species are thicker and Chinese species are thinner.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

繭糸の太さをいう。単位はデニールdenier(略符号d)を用いる。繭糸の太さは繭層の外層部が最も太く，中層，内層の順に細くなるが，通常繭糸繊度はその平均値を示す。この値は一定量の繭を繰糸して得られる生糸糸長，生糸量，平均粒付数などから算出される。繭糸繊度は蚕品種，蚕期あるいは飼育条件などにより異なるが，現在一般に飼育されているカイコのつくる繭糸の太さは2.5～3.5dのものが多い。品種別にみると，日本種系のものは太めで，中国種系のものは細めである。

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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