Note: Descriptions are shown in the official language in which they were submitted.
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2~55393
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PROCESS AND ~EVICE FOR AIR TEXTURING
Specification -
The invention relates to a ~rocess for air texturing
yarns made frorn glass fibres in which the fibres are fed
tc~ a first deliverv device and then ~ass through a
t.e~turi1lg nc~zzle a11d finallv to a secc)nd delivery
device. The invention furtll~r relates tC~ a device tc~
carry C)llt t]liS proc:ess l~ith a first and seco1ld deliverv
device an-1 a te~t~lring nozzle arranged bet-~een them.
prC)C'eSS i9 ~nc)wn wllereb~ fibres e.g. ~lass fibres
toc~ are fed Wit]lC)l1t beiny t:wisted intc) a texturiny
noæzle from a first delivery device and fron1 there into
a second delivery device. I~ith this process there is a
dan~er that individua]. filaments of the fibres fed intc,
the device s~ill break at the inlet to the text1lring
nozzle which can result in hold-t1ps and finally
breakin~ of the yarn. Single untwisted yarn~ of this
type tend to swe~ p in the teYturing nozzle in an
uncc~ntrolled, uneven manner. The te~turecl yarn thus
obtained i~ unsatisfactorv for many applications.
A further process ls know1l in which fihres coming frorn
spinning bobbins are brought together and twisted. The
material thus obtained can be fed into a texturing
nozzle. As a result of the twisting any broken
filaments which mav have protruded are bound into the
material again. This binding prevents broken filaments
from catching at the inlet to the texturing nozzle. In
addition this ~aterial produces a regularly fluffed up
textured yarn. However the disadvantage of this
process is that the twisting of the yarns is a separate
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~55393
process carried out before the material is introduced
intc) the ~e~turing nozzle and involving considera~le
cost outl~v. ~ further disadvantage is that in the case
of more bri~tle m~terial additic)llal agents are required
to aid twistillg. For instance it is usual to applv so-
called textile finishillg to glass fibre material in
order to make twisting possible at all. This prc)cess
not only involves additional costs but a further
disadvantagt? is th.l~ the te,Ytile finishill~1 usecl causes
problems during ~ubsequellt use of the yarn e.~. by
rnaking embec~ding iSl a matrix mc)re difficult.
The taYk of the present invention is to pr-esent a
process of the tvpe described at the begill]ling in wllicl
the fibres to he textllred can be reliabl~ fec3 into the
te~turing ll02zle and te~:tured there in an even manller at
considerablv reduced ou-tlay and wc)rkload. The fibres
3hou].cl ollly be under sligllt: strain so that even in the
case of critical yrirnary materials additio}lal au~iliarv
agents can largely he dispensed l~ith. Another tas~ of
the present invention is to desiyn a device to carrv out
this process.
This task is sc~lved in acicc)rdance with the inventic)n by
a proce~s of the kin~l described at the beginning in that
the fibres are fed into the first delivery device either
separately ~r plied and that the fibresi are given a ~
false twist. joining them together to forM a single unit ~-
at least for the area between the inlet and the outlet ~ ;
of the texturing nozzle.
Thus no preparatory processing e.g. twistin~ is
necessary before the material passes into the first
delivery device. The false twist gathers the fibres
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into one unit and binds anv broken fibres into the l~hole
so tllat hold-ups and obstructions at the nozzle inlet
are avoided. The resulting bundled fibres enterillg the
texturing nozzle ensure uniforrn swelling of the yarn.
The prc)cess in ~ccordance with the invelltion can be
further developed so that the threads pass over a false-
twisting device between the texturing nozzle and tlle
secc)nd delivery device which applies a twist to the
fibres i]l the area hetw~el7 tlle first delivery device anci
the false-twi~ting device.
After leaving tlle textllring nc)zzle the fibres pass over
a false-twisting device wllicll gives theln a t.wist ill the
area J~etween the first de]iverv devlce and the. fal~e-
ts~isting device. A3 a result of this the threads are
bouJld together tc~ form a wllole at the same ti~ne binding
any brokerl filaments wllich mav be rJresent. This ensures
that the varn twisted in this wav enters the nc)zzle in
the desired manner. The single yarn thus formed is also
subjected as a whole to the air blast in the texturing
nozzle. As a result the entire unit is affected rather
than individual fibres sc) that the yarn swells evenly.
Thi~ ~dvantage is a~hieved without any additianal
twisti~lg or rewinding procedures instead simply bv
in erting any known type of false~twlsting device into
the yarn flow.
The process in accordance with the invention can also be
carried out in snch a way that a twist is applied to the
yarn in the area of the texturing nozzle of up to 150
T/m. In many cases it is expedient to apply twi~ting of
less than 100 Tim to the yarn in the area of the
texturing nozzle. This twisting ensures that the
desired advantages are achieved with respect to the
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~ fibres entering the texturing nozzle and that the
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blastil~s procedure itself is favourablv affected within
the nozzle. .~t the sarne time, however, fewer turns in
th~ v3rn ~?rodl3ce less strain oll the individual filatoellts
and, thus, also reduce the danger of brealcing.
The process in accordallce with the invelltion can also be
carried out in such a wav tllat a Z or S-shaped turn is
applied t() the varn in the area of the te,~turing nozzle.
In this l~ay a special ef fect can be achieved in the
te:~ ~ur ed varn .
The process in accordallce with the inventic)ll also allc)ws
for twisted and/or noll-tliisted fibres to be fed int~) the
first delivery device. BV apDrol:)riate selectioll of the
materials ~nd the nature oE i:he t~iiStill~, ~he te~tllL-~cl
yarns produced can be given certain qualities, in
particlllar Witll re-~ard to strength, elasticity and
volume.
A device d~si~ned to carry out the 1~rocess in accordance
with the inventioll is characterised irl that a false-
twisting device is provided between the texturing nozzle
and the second delivery device which has as a deflecting
body a fr~ely rotating twiYting pin wit]l its axle at an ;
inclinatioll to the direction of transport of the yarns
and a diameter larger than ~ ïnsn.
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The rotatahle mounting of the twisting pin avoids
friction and, thus, strain on the individ~lal fibres as
they pass througll the false-twisting device. The fihres
can be guided in such a way that wilen they pass over the ~ -
twisting pin the coil~s do not touch one another. The
inclination of the ~twisting pin in relation to the
direction of transport of the f ibres Prevellts the coils
of varn from tonching when they pass over the twisting
pln, tllus also reducing strain on the mater~al. A
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di ameter c)f more than ~ mm also allows relatively
brittle rnaterials to be processed.
Fina] ly the device in ac:cc)rdance with the invention can
l:)e designed in such a way that the distance of the
fa~se-tlvisti]lg device from tlle te~turing nozzle is
ad justable .
It is obviou~ to anvc)ne familiar with the subject that
the settin~ alld selection c)f the varic)us rneasuremellts
e.g the ~liarneter of the twiStillg !~in~ the pesitic)n of
the false-twis~.ilJ-~ 3evi.ce in re~.ltioll to the te.;turillg
nc)zzle and the def ].ectiolls :~hich t al~e place in the ~ -
delive:ry devices must. be ad justed to Sllit the
re(~uirements of ~.he material and tl~e varn clellier in each
ca c: e .
,~ practical embodiment of the l~rocess and t.he device in
accordance wi tll the inventioll are tlescribed belo~
Fig. 1 ~hows a diagram of the texturin~ device in
~ccordance with the invention and
Fig. 2 shc)ws a tol)view of a fal3f3-t~isti.rlg device in
the dire~ti~n of arrc)w A in Fi~. 1.
In the practical etnbodiment shown in Fig. 1 three
untwisted threads 1 2 3 in the form of multifilaments
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are fed into a fir; t delivery device 4 of a common type.
After leavillg the deliverv device 4 the threads 1 2 3
pass through the inlet 5 of a texturing nozzle 6 and re-
emerge frorn an outlet 7. ~he threads 1 2 3 are then
guided via a false-t~isting device 9 to a second
delivery device 10 and from there are drawn off in the
direction of the arrow 11 .
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The texturing nozzle 6 is of a kno~ll tvpe of
constructic~n. The threads l 2 3 passing through it are
fluffed up in a knoln manner by blasting with
pressurised air.
The false-twisting device 9 is equiooed witll a drive
not illustrated here which turns the false-twisting
device 9 rc)un-l an axle runtling in the direction of
tratls~?crt. It l~.ld ~ rill~ 12 in ~hicl~ a twist:ing pitl 13
is held in a ~reelv rot.~ le rnanner in accordarlce witl
arrow 14 all an axle arranged diarnetrical]v to the ring
12. The axle of the twistin-~ pin 1~ is not at a riaht
angle to the directioll of transo~)rt or the threads but
is. inclined to~iards this directioll.
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The threads f~)rrn a lool~ Oll the twisting 1~1n 13 the
beyinniny and end of WhiCIl do not touch one anotller as a
reslllt of the inclillatic)ll of the twisting pin 13. Tlle
twisting pin 13 turns in accc)rdance with the speed of
transpc)rl: of t:he threads. The relative speed between
the olJter surface of the twisting pin 13 on the one harld
and th0 threads Oll the other is zero.
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The distallce between the false-tl~lsting device 9 and the
~exturing nozzls 6 is adju~table so that the device can
be adapted to suit various nualities of material and
yarn derlier.
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The drawing speeds of the delivery devices 4 10 are
adj~sted to c.orrespond to one another in the knc,wn wav
in order to take account of the contraction which
resu1ts from the f1uffing up of tlle materia1.
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In the practical embodiment in accordance with Figs. 1
and 2 the threads 1 2 ~ are guided via the first
delivery device 4 and the texturing nozzle 6 into the
false-twisting device 9. The threads 1 2 3 are given a
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twist as a result of the rotation of the false-twisting
device 9 wllicll i9 ideallv less than 100 T/m. In this
wav the tilre3ds 1 ~ 3 fed into the first deliverv
device ~ as single strands are bound together into a
c~osecl unit and in this forrn are drawn intc~ the inlet 5
of the texturing nozzle 6. The number of turns a~plied
to the threads per unit of length is determined
according to the characteristics of the threads
selected. Fc)r this purpo~ e the nature of the rnaterial
rnust be ta';en into accoun~ and care rnust be taken to
en.sure that the nurnher of turns dc~es nc)t sllbject an~ of
the n~aterials used to undlle strain.
The te.Yl:l~red var~l e~ner~ frorn the c)utlet 7 still has
the t~ist. W]liCIl ha~ie beerl al:l~?lied to it. .~S a result
of the known false tl`liSt effect the ~ arn is no lollger
tl~isted after passillg over the false-twisting device
and fllrtller fluffing up c~ccurs.
Arlv threads capable Oe being fluffed up can be treated
witll the procei~s and the device in accordance with the
invention. In particular however the processing of
relatively brittle threads such as e.g. glass fibre
thread.~ is posYihle since the procesi~ and device ensure
that thei~;e fibres are treated in the necessarv stre-;s-
f ree manner .
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