Loepfe YarnMaster Zenit, Instruction Manual

Page: 59 / 83

ZENIT 59
MONITORING DATA
SFI
The SFI is the sum signal of the protruding fibres of a yarn
within a measured length of 1 cm.
SFI/D
SFI/D is the sum signal of the fibres protruding from the core
diameter of the yarn. The core diameter of a yarn is defined as
to 100%. The SFI/D numbers therefore refer to 100.
SFI/D allows to detect off-standard bobbins (sporadic thin or
thick places which normally do not disturb, but have a nega-
tive effect on the fabric appearance when too many occur)
and, if necessary, remove the yarn with faults during the
winding process.
Variable CV
(Option)
CVd
The clearer calculates continuously the VCV values from the
yarn pieces with the set check length and compares these
with its floating mean value.
Surface Index SFI (Option)
The Surface Index SFI is a universally usable quality para-
meter and allows conclusions as to the neppiness, hairiness
and irregularities.
The evenness of the yarn material (yarn fineness) and, to a
special degree, the yarn hairiness are basic characteristics of
spun yarns. In most cases, the unevenness of the yarn fine-
ness has a close relationship to the draft in spinning or prob-
lems of the draft elements.