Appeal No. 1997-0144
Application No. 08/424,223
that
[t]he use of a high strength fiber strand, preferably
one having a tensile strength of not less than four
hundred thousand pounds per square inch, such as, high
strength Kevlar, for example, Kevlar 29 aramid,
preferably of the multifilament type in the core is
very advantageous. Multifilament is more linear than
spun and slides and/or flows better with the other
parts of the core during fabrication and subsequent use
of an article of apparel produced therewith. The high
strength multifilament core strand which [sic]
relatively unstretchable takes a great deal if not the
major part of the tensile load to which the yarn is
subjected during knitting. It also appears to increase
the flexibility of the core part of the yarn over an
all metal core and in turn makes the yarn more easily
knit, i.e., imparts to the yarn greater knittability.
The high strength synthetic wrapping 12 increases the
cut resistance, etc. of the yarn but produces a hard
rough, somewhat abrasive surface formed of hills and
valleys lengthwise of the yarn. It does, however
provide a desirable rigid backup surface for the outer
winding 14. The top or outer wrapping which is
preferably a white Nylon, a stretchable synthetic
fiber, tends to fill out the valleys of the wrapping
immediately therebeneath and produce a yarn having a
good appearance and a relatively smoother non-abrasive
surface. Apparel produced with yarn of the present
invention has a relatively soft non-abrasive outer
surface and maximum comfort.
The Robins patent, like Bettcher, discloses a composite yarn
construction particularly adapted for use in cut-resistant body
protective apparel. The composite yarn in Robins comprises
(e.g., Fig. 2) a high strength core yarn (11) covered or overlaid
with a knitted, cut and abrasion resistant strand (12) of
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