Oerlikon Schlafhorst Express - Oerlikon Schlafhorst - Oerlikon Textile

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Oerlikon Schlafhorst Express Technology
A neat job thanks to PreciFX
New design for dye packages for yarn-protecting,
reliable downstream processing
For the package dyeing plant in particular,
optimally constructed and prepared packages
are the key to success where top quality and
efficiency are concerned. The highest level
of technological know-how and process
expertise is required – after all, it’s a question
of converting the individual dyeing process
requirements into a package design that
meets these requirements.
Key requirements and parameters for
dye packages
The most important criterion is maximum
uniformity in the package structure and density,
both within a package and reproducibly
from package to package. Often-described
factors that influence the winding process
include the yarn tension, package flank
formation, the cradle pressure, ordered
laying of the yarn and pattern-free package
build. The choice of winding technology is a
“question of philosophy and faith”: "random
winding", precision winding or step precision
winding. With the Autoconer 338 and the
Autoconer 5 and the systems Autotense FX
und Propack FX, central setting of the winding
parameters, mechanical lateral displacement
of the yarn layers and gentle placing of
the yarn, Oerlikon Schlafhorst has already
made a substantial contribution to optimi-
New dye package design thanks to PreciFX.
sing dye packages and has extracted
almost the maximum technological knowhow
possible in the field of drum winding.
Expose and tackle weak points targetedly
with PreciFX
The new drumless yarn traversing system
PreciFX now offers considerably greater
freedom for configuring the package design
individually to suit the dyeing process. The
formation of the package flanks emerged as
an extremely crucial criterion for the success
of the dyeing process. This sticking point
inspired the Oerlikon Schlafhorst specialists
to develop new ideas with fascinating,
creative results.
Round flanks – the solution to the puzzle
The package flanks, no matter how "soft",
always give rise to the risk of poorer dye
penetration ("dead zones"). Normally the
packages are edged prior to dyeing by
mechanical deformation with the aim of
improving the dye penetration properties by
"refraction" of the denser package flanks. It
should be clear to anyone that this goes
hand in hand with impairment of the package
build and a deterioration in the unwinding
behaviour due to shifting of the yarn layers.
Round flanks of varying degrees.
Hence the motto "Away with the flanks"
back in the winding process, because then
they cannot be a source of faults. With
PreciFX the yarn laying is controlled by
means of software in such a way that the
package is rounded directly in the winding
process. This is actually a rounding and not
breaking of the edges (formation of a new
chamfer with two flanks). The package
receives its final form directly with uniform
density in all directions. Depending on the
requirement and the material, various
rounding radii can be set easily and centrally
at the Informator by entering some requirement
parameters. The rounding to be wound is
calculated by PreciFX itself. This can be
used for all types of winding. In addition to
the huge quality advantage offered by the
evident protection of the yarn, an economic
process advantage that is not to be underestimated
is yielded. On the one hand, the
mechanical intervention of breaking of the
edges on the carefully produced package
structure is dispensed with. On the other
hand, rewinding as a second process stage
following dyeing can also be eliminated, as
yarn layer after yarn layer can be unwound
superbly. All in all, a neat job thanks to
PreciFX, as already confirmed by the first
customer verdicts.
Flanks as a source of
faults in uneven dyeing.
Principle of mechanical
breaking of edges.