Air Vortex Spinning

Air Vortex Spinning Prof.Dr.S.Kathirrvelu Professor-(Text.Tech) EiTEX, BDU " #Sc (T#)-T$S-%&S

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Vortex Spinning &ortex s'ii techolo* +as itrouce * #urata #achier* t. a'a i 100. This techolo* is est ex'laie as a evelo'2et of air-3et s'ii, 2a4i use of air 3ets for *ar t+isti. The 2ai features of #urata vortex s'ii (#&S) are %ilit* to 'rouce *ar at 400 m/min. +hich is al2ost 20 times greater than ring spinning fra2e 'rouctio . 1. o+ 2aiteace 2aiteace costs, costs, a full* auto2ate 'ieci 'ieci s*ste2 a eli2iatio of rovi fra2e. . The *ar a the faric 'ro'erties 'ro'erties of #&S *ar *ar are clai2e clai2e * the 2aufacturer 2aufacturer to e co2'arale to those of ri s'u *ar. " #Sc (T#)-T$S-%&S

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&$6TEX *ar is 2ae * the 7&$6TEX s'ii 2achie7 of #urata #achier* (#U6%TE8). The &$6TEX s'ii 2achie s'is *ars i a ui9ue +a* usi a air vortex +hich +as evelo'e a is 2aufacture ol* * #urata " #S (T#) T$S %&S

5

Principle of operation

The basic principle of operation is shown in Figurs 1 and 1 and 2. The sliver is fed to 4-over-4 (or a four-pair) drafting unit. unit. As the fibers come out of the front rollers, they are sucked into the spiralshaped opening of the air jet nozzle. nozzle. The nozzle provides a swirling air current which twists the fibres . A guide needle within the nozzle controls the movement of the fibres towards a hollow spindle. After the fibers have passed through the nozzle, they twine over the hollow spindle. The leading ends of the fiber bundle are drawn into the hollow spindle by the fibers of the preceding portion of the fiber bundle being twisted into a spun yarn. The finished yarn is then wound onto a package. " #Sc (T#)-T$S-%&S

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Figure 1 : Feed material Passage Through the machine

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;

Figure

2:

xpansion

o!

"#re

edges due to $hirling !orce o! the  %et air stream " #Sc (T#)-T$S-%&S

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 The rafti uit is alsoa

ver*

i2'ortat ele2et i %ir-3et s'ii. &igh dra!ts have to

e

'erfor2e, good

+ith e'enness =er

of the

>o+

a

excellent orientation of the =ers, at ver* hih 'rouctio s'ees. Both

su''liers

have e9ui''e the " #S (T#) T$S %&S

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%s a co2'ariso +ith the aove-escrie +ra''i 2echais2 +ith tae2 3ets, it is useful to cosier the e@ectiveess of +ra''i +ith ol* oe 3et. " this situatio, the At+isti actio of the 3et is ot ulli=e, a the core is therefore At+iste. The ee =ers +ill, as escrie aove, +ra' the core +ith a Airectioal helix. Bei that the core t+isti is o+ i the sa2e irectio as the +ra''i actio, so2e ee =er 2a* eco2e cauht a t+iste ito the core, there* reuci the u2er of the2 availale to +ra' the core. " #S (T#) T$S %&S

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$e a''roach to icreasi the u2er of ee =ers is to icrease the leth of the s'ii triale so that the t+ist isertio 'oit is farther fro2 the i' lie of the frot rollers. This results i ee =ers havi to travel farther to+ar the t+ist isertio 'oit at the a'ex of the s'ii triale.

The

e@ect

of

oi

this

ca

e

e2ostrate i covetioal ri s'ii * 'artiall* restricti the t+ist >o+ to+ar the i' lie of the frot rafti The result is a " #S (T#) T$rollers. S %&S 0

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1!

?iure o+ 2a* " #S (T#) T$S %&S

11

$e

'role2

+ith

the

vortex

s*ste2

is

sii=cat =re loss uri the *ar for2atio.  This is relate relate to the 'role2 of variatios i *ar 9ualit* +hich are ot etectale * covetioal eveess testers a so2eti2es ol* ieti=e * +ea4 'oits i the =ishe faric. The 'ath follo+e * the =re i the currets create * the air 3ets 'la* a crucial role i *ar 9ualit*. #ost structural efects are cause * the e>ectio of =res i the air 3et " #Sc (T#)-T$S-%&S 1

•

Both eliver* s'ee a *ar cout are sii=cat factors

for

*ar

eveess

a

i2'erfectios.

%

icrease i eliver* s'ee results i eterioratio of *ar

eveess.

This

is

the

result

of

ecreasi

eFciec* of the air 3et strea2 at hiher eliver* s'ees ecause there is less ti2e for the +ra''er =res to +ra' arou the 'arallel core 'ro'erl*. This 'articularl* a@ects =er *ars a 2eas that vortex s'ii is est suite for coarser raes of *ar. Gole 'ressure also has a sii=cat e@ect o *ar 'ro'erties. " #Sc (T#)-T$S-%&S

15

The structure of vorte !arn co"pared to other !arns Vortex yarn has a two-part structure a core surrounded by wrapper fibres. The number of wrapper fibres compared to the fibre core is higher compared to the air  !et spinning. "uring yarn formation, formation, the leading ends of the fibres are directed towards the yarn core and the trailing ends wrap around the core fibres. #uch a structure provides the necessary fibre orientation and, at the same time, the re$uired yarn strength. " #Sc (T#)-T$S-%&S

1:

 This 'articular structure of the %ir-vorte %ir-vortex x s'u *ars i>ueces the *ar 'ro'erties, of course. These 'ro'erties are 2ail* eter2ie *  'ara2etersH 1. the 'er 'ercetae cetae of +ra'' +ra''i i =ers =ersII . the t+ist t+ist level level of of the +ra''i +ra''i =ers. =ers.  The 'ercetae of +ra''i =ers ca e i>uece * the s'ii raft a * the istace  (?i. 5;), a it is also a fuctio of the *ar cout. " #S (T#) T$S %&S

1;

Spinning no((le  The s'ii ole is asicall* the *ar for2atio for2atio ele2et, i.e. the heart of the %ir-3et s'ii 'rocess. 8o2'resse air at u' to !.< #'a eters the actual s'ii cha2er throuh : s2all ores, thus creati a ver* stro air vortex (see ?i. 5