(57) Vacuum spun yarn may be produced that have strength and properties approaching that
of ring spun yarn, and at speeds greatly in excess of production speeds for ring spun
yarn. An elongated hollow shaft (15, 150) has a through-extending passageway (153,154)
from a first end to a second end thereof, with a portion of the shaft adjacent the
first end perforated (16, 155-157). The perforation slant in the direction of the
second end, and a spherical vacuum reservoir (162) is formed in the shaft. A diffuser
in the form of a collar (164) having elongated slots (169, 170) corresponding to the
perforations surrounds the shaft, surrounds the shaft. The shaft is rotated about
an axis at a constant high speed so that free ends of fibers passing through the shaft
will draw toward the shaft perforations and be caused to rotate with the shaft as
the fibers move linearly along the axis of rotation. A core filament yarn (c), such
as a full stretched textured yarn, may be fed into the shaft with the nipped sliver
or roving fibers. Yarns may be produced having a spun-like appearance, a loop or Boucle
effect, or a yarn having a core with real twists with fibers wrapped about the core
to provide surface effects.
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