BCF Texturizing

7/21/2019 BCF Texturizing

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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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Page 6 Presentation

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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Page 9 Presentation

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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Page 10 Presentation

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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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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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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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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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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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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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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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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BCF Texturizing

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