bcf texturizing
TRANSCRIPT
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BCF-texturizing
NEUMAG
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BCF-texturizing
part 1 : basics - texturizing process
NEUMAG
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Page 3 Presentation
texturizing process- Why texturizing?
yarn volume
yarn capability to recover after mechanical stress
Plug formation
decelaration of yarn because of forcebulking to yarncontinuous supply of yarn
Plug transport
dynamic air pressure of air feeded thru nozzlethread momentum energy
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Page 4 Presentation
Texturizing principles: Friction Texturizing
exhaust bynegativepressure
plug is formedby friction
flat yarn fromdraw godets
inlet nozzlehot air or steam inletyarn pathtexturizing nozzleoutlet nozzleinlet lamella chamber area of crimp formation
exhaust
area of crimp setting
lamella chamber
lamellas
outlet lamella chamber
exit pipe
3D texturized yarn
Frictions - Texturizing
- Plug formation by friction force- Control of outlet velocity of plug by force
equilibrium
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Page 5 Presentation
Texturizing principles: Roller Texturizing
inlet nozzle
hot air or steam inlet
yarn path
texturizing nozzle
outlet nozzle
inlet slotted chamber
area of crimp formation exhaust
area of crimp setting
slotted chamber
outlet slotted chamber
exit pipe
3D texturized yarn
flat yarn fromdraw godes
exhaust bynegative pressure
plug is formed andcontrolled byroller speed
roller
Roller - Texturizing
- Plug formation by airblowing- Control of outlet velocity of rolls
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Bi Tex - principlePrinciple
Combination of friction type processstart and roller typ production
easy plug formation by friction force
Adjustment an control of outletvelocity using roller
No further need for vacuum after plugformation
rolls
lamellachamber
texturizingnozzle
vacuum
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BCF-texturizingpart 1 : basics - definitions
NEUMAG
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Page 8 Presentation
Definitions 1Nr. name description
1 Texturizing nozzlenozzle which feeds the yarn in thetexturizing chamber
2 Texturizing nozzle : Yarn channel area where the yarn is feeded thru
3 Texturizing nozzle : yarn inletupper part of yarn channel oftexturizing nozzle
4 Texturizing nozzle : yarn outlet
bottom part of yarn channel oftexturizing nozzle;transition from nozzle to lamella chamber
5 Texturizing nozzle : air channels inlets of air into yarn channel
6Texturizing nozzle :impingement point area where the yarn and the air is mixing
7 Stuffer box; texturizing chamber part where plug is formed8 Lamella chamber type of stuffer box for friction texturizing
9 Lamellafriction : part of lamella chamber whichis in contact with yarn
10 Lamella edgefriction : part of lamella which is incontact with yarn
11 Slotted chamber type of stuffer box for roller texturizing
12 vacuum; underpressureunderpressure of suction of air out oflamella chamber
1
4
6
3
2
1 5
10 9
7 /8
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Definitions 213 Movable side door side of divided texturizing chamber 14 Fixed side fixed side of divided texturizing chamber 15 Rolls feeding rolls in roller texturizing
16 Lowest plug formation vacuum
slightest difference ambient pressure -vacuum in text. chamber where plugis formed
17 Yarn tension of nozzle
yarn tension between godet and
texturizing nozzle
18 Plaiting anglepoint on cooling drum whereplug is distract
19 Twist of nozzletwist of yarn between godet an nozzlebecause of nozzle
20 Crimplength difference between strechedand non-streched yarn
21 p(plug-formation)counterpressure for plugbuilding ( notpermanent )
22 outlet pipefor Bitex and friction : giudes the plup torolls /cooling drum
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Definitions 3 : Bitex & frictionyarn tension / plug density vs. vacuum
0
20
40
60
80
100
120
140
160
-80 -70 -60 -50 -40 -30 -20 -10 0
vacuum
y a r n
t e n s
i o n
/ p
l u g
d e n s
i t
plug density
yarn tensionno plug
lowest
possiblevacuumbreakbecause ofchoking thenozzle
best operationpoint
5-10mbarbelowlowestpossiblevacuum
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Page 11 Presentation
Definitions 4 : Bitex & rolleryarn tension / plug density vs. roller speed
50
60
70
80
90
100
110
120
130
140
150
40 45 50 55 60 65 70 75 80 85
roller speed
y a r n
t e n s
i o n
/ p
l u g d e n s
i t y
plug density
yarn tension
no plug
fastestroller speedbreak
because ofchoking thenozzle
lowest rollerspeed
5-10 cN
5-10 %bestoperation point
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BCF-texturizingpart 1 : adjusting parameters
- thread pre-treatment
NEUMAG
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Page 13 Presentation
Thread pre-treatments 1- Draw ratio
influences capability to preserve crimp under tension
the higher the stretching of the yarn the lower theelongation
PP should be stretched to the maximumnot overstretching - yarn breaksregular checks because of polymer ( elongation; tenacity )
S pin finish
influence friction in texturizing in chamberinfluence company of filamentsinfluence tendency to glue on the godet eveness is important
Note : each process has its own dependencies and optimums. Shown graphsand values are not transferable
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Page 14 Presentation
Thread pre treatments 2
yarn temperature
influence tenacity of yarn during texturizinginfluence the capability of crimping the yarn
influenced by godet temperaturegodet temperature influence mainly crimp / shrinkageheat transfer coefficient : clean godet surfaces
M6_1 : crimp vs. godet temperature
PA6; 1340 dtex; 3200 m/min
10
10,5
11
11,5
12
12,5
13
13,5
14
14,5
15
15,5
16
16,5
17
150 160 170 180 190 200 210
godet temperatur [C]
c r i m p
[ % ]
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BCF-texturizingpart 1 : adjusting parameters
- in texturizing head
NEUMAG
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Page 16 Presentation
Adjusting parameters 01- Texturizing nozzle
temperature
influence temperature in lamella chamber
influence crimp / shrinkage ( not as strong as godettemperature
if to high melting of yarn in lamella chamber after break
Texturizing nozzle pressure
influence yarn tension ( process stability)influence twist ( process stability )influence slightly the crimpto the nozzle pressure has found out the optimalvacuum
M6_2: crimp vs. Temperature of texturizing airt(nozzle) T(nozzle)
PA6; 1340 dtex; 3200 m/min
10
10,5
11
11,5
12
12,5
13
13,5
14
14,5
15
15,5
16
16,5
17
180 185 190 195 200 205 210 215 220 225 230 235 240
Temperature of texturizing air T(nozzle) in C
c r i m p
i n %
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Adjusting parameters 02- vacuum chamber / roller speed
influence slightly crimp and shrinkage
influence process stability ( evaluate min - max. )
Bitex : vacuum time approx. 10-15 sec.
texturizing nozzle geometryinfluence yarn tension and process stabilityinfluence crimp and shrinkageinfluence mixing ( tricolor )Bitex & friction : 2 different sizes; rolls : 2
lamella chamber geometry
influence process stabilityinfluence crimp and shrinkageBitex & friction : 2 different sizes; rolls : 2
PA6 1250dtex
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
20 30 40 50 60 70 80 90 100 110
mbar
%
Mitte - Shrinkage
Mitte - crimp
Polynomisch (Mitte - crimp)
Polynomisch (Mitte -Shrinkage)
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Page 18 Presentation
Adjusting parameters 03
- vacuum and speed cooling drum
vacuum influence capability to cool the yarn
determines plug density on cooling drum
Completely filled cooling drum groove to increasecooling time and equalize air flow (especially neededfor PP)
crimp as function of cooling time
-5,0
5,0
15,0
0,0 1,0 2,0 3,0 4,0 5,0
cooling time in sec.
c r i m p o
f B C
F - y a r n
newstandard
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Page 19 Presentation
Adjusting parameters 04
plaiting angle / yarn tension behind cooling drum
influence process stability ( tangeling)
influence crimp by possible crimp losspulling out crimp if yarn isnt cooled properImportant is yarn tension after cooling drum andprocess stability
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BCF-texturizingpart 2 :maintenance and trouble shooting
NEUMAG
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indicatorsall
experience/ maintenance intervallsefficiency of processincreased number of yarn breaksloss of yarn tension before nozzlechange of twist between godet and texturizingnozzlechangings of plaiting angle of cooling drum( depends on process)changings of crimpchangings of shrinkage
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cleaning 1alldeposits in texturizing nozzle(yarn channel and air inlet )deposits in texturizing supportdeposits in cooling drum suction vacuumdropsdeposits on godets
Bitex & Friction deposits on lamelladeposits in lamella chamber housing / slottedchamberdeposits in vacuum suction vacuum fluctuation
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cleaning 2
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Tear and wear of yarn contact partsall: Texturizing nozzles impingement point
yarn outlet
yarn inlet ( tricolor )
step in yarn channel
Bitex & Friction: lamellas
upper part of lamella edge
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Frequent damages 1
all / Texturizing nozzle
Burr in yarn channel or air channels
Yarn outlet of texturizing nozzle deformed
Excess length of wrong screws overcontact level mark on door nozzle half
all
Contact surfaces of texturizingnozzle or lamella chamber notlevelled or flat
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Frequent damages 2Bitex & Friction : lamellas
lamellas deformed or bendedLamella edge with burrsLamella surface gratedLamella chamber housing dented excess length on contact areadifferent grinding direction of lamellas ( sides ) - for very sensitiveprocesses
all : other problems
thread guides over texturizer damagedchamber crest twistedPairing of texturizing nozzles and lamella chambers
Bitex & Roll :damage / burr of cogs of feeding rolls (in most cases by cutting yarnfrom the feeding rollsburrs in ground of slotted chamber ( slit )
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component checkallSight inspection of texturizing nozzlesmatching numbers of nozzle; matching numbers of lamella chambers /slotted chambersSight inspecition of individual lamella (bending, finger nail test: burr oncutter,..) or slotted chamber
Bitex & Friction Lamella chamber: Twisting of chamber crest
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component check
Roll
Flat contact surface of nozzle and slotted chamberNo step between nozzle and slotted chamberNozzle and slotted chamber centeredNozzle and thread guides centeredNo deformation / damages of nozzle and slotted chamber
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component checkBitex & Friction Lamella chamber with mounted lamella: sightinspection on deformed lamella and dentsContact nozzle : yarn outlet - lamella slant
all Pressure foil "pressurex" test of forcedistributionwww.pressurex.com ;
roller : 28-85 psifriction : 70-350psi
contact
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Page 30 Presentation
process checkall : on the texturizing head Centrical yarn inlet in texturizing nozzle ( guide )Twist of yarn between godet and nozzleYarn tension before nozzle and after cooling drum
Bitex & Friction
Underpressure fluctuations (mano-meterand pressure gauge)Lowest plug formation vacuumUnderpressure / vacuum
Bitex & Roller Adjustment of roller speed
all : yarn CrimpShrinkageTenacity
Elongation
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