再さい生せい繊せん維い

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Meanings

1

noun

regenerated fiber

Technical term for fibers produced by chemically processing natural materials (e.g., rayon, cupra).

again, twice, second time

生life, genuine, birth

繊slender, fine, thin kimono

維fiber, tie, rope

合ごう成せい繊せん維い
合成繊維 are synthetic fibers made from petrochemicals, while 再生繊維 are regenerated from natural polymers.

Compound of 再生 (regeneration) and 繊維 (fiber), directly describing the manufacturing process.