Abstract
On transition to spinning 0.13–0.17 tex HMV fibres to 0.22–0.44 tex fibres, to maintain diffusion conditions in spinning, the H2SO4 content of the precipitation bath should be kept at a level of 70–75 g/liter or increased by no more than 1–2 g/liter. Process stability is achieved by reducing the spinning speed. However, the round cross-sectional form of the fibre is not retained, and its physicomechanical properties are diminished.
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