Appeal No. 2000-0698
Application No. 08/960,694
upon being unwound from a bobbin, is splittable into individual
filaments. According to the appellants, the individual
filaments of the invention are "not mutually plied, entangled,
or locally or longitudinally stuck together." (Specification,
page 2, lines 16-20.) Further details of this appealed subject
matter are recited in illustrative claim 9 reproduced below:
9. An elastane multifilament yarn with two to
six individual filaments which, upon being unwound
from a bobbin, is splittable into individual filaments
and which is produced by an improved dry spinning
process for producing an elastane multifilament yarn,
wherein an elastane solution is dry spun to form the
yarn, in which the improvement comprises reducing or
preventing interfilamentary adhesion by
1) deploying in the spinning head of a
conventional dry spinning apparatus at
least one multihole spinning jet whose
individual capillaries are located on
one plate, the distance x between
capillaries on one jet plate and the
distance y between capillaries on any
adjacent multihole spinning jet plates
conforming to the relationship 40 mm <
x < y < 500 mm,
2) laminarizing the gas flow in the dry
spinning apparatus to prevent
entangling of the individual filaments
from adjacent multihole jets,
3) passing the resulting elastane yarns
leaving the spinning shaft through a
first thread guide with one opening per
individual filament and then through a
second thread guide which gathers a
plurality of individual filaments
together to form a multifilament, and
4) winding up the multifilament yarn,
whereby the resulting elastane filaments are free from
adhesion to one another.
2
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: November 3, 2007