LAUSR

Biomimetic spinning mimics natural filament formation by inducing stress‐driven fibrillation of protein molecules into nano‐filament bundles. Silk proteins, like fibroin or spidroin, have inspired analogues such as liquid crystals or micelles for spinning feedstocks. However, these often miss the dynamic nature of natural feedstocks, making stress‐induced fibrillation difficult to replicate. A “flow‐induced dehydration” hypothesis is proposed to explain how native silk proteins respond to stress during spinning. In Bombyx mori, fibroins transition from a homogeneous state in the posterior region to a two‐phase structure in the middle gland. Dense entangled fibroins support conformational changes, while diluted regions ensure flowability. this model is validated using reconstituted silk feedstocks with induced phase separation, producing fibres with excellent mechanical properties and offering a new direction for bio‐inspired fiber processing.