FEATURES

ENTANGLEMENT STRENGTH TESTER

LH-485 EST

• Entanglement Testing System for running andapplying up to 20 Elongation steps to the yarnundertest

• Dual Zone transport with Draw Zone andMeasurementZonetensionmonitoring

• Drawselectablein0.5%Elongationsteps

• Selectabletestingspeed50to400m/min

• DrawZoneAccuracy±0.1%elongation

• DrawTensionmeasurement0to1000grams

• Pretensionadjustable5to45grams

• CCDcamera,capableofmeasuringevery0.5mmofyarnwithprecisionof3.5micron

• Selfcontainedyarnwastebin

*All specifications are subject to change.

Lawson Hemphill Inc.1658G.A.R.Highway,Unit6Swansea,MA02777USAPhone: +15086795364information@lawsonhemphill.com www.lawsonhemphill.com

ContactustodayformoreinformationonanyLawson-Hemphillproduct!

ENTANGLEMENT STRENGTH TESTER

MODEL

LH-485EntanglementStrengthTester

Speed 50to400m/min

YarnCountRange 22to1500denierentangledDTY,FDY,POY

DrawZone Userselectable20Elongationstepswith±0.1%precision

MaxElongation 25%

DrawZoneTension 1000g±0.5g

MeasuringZoneTension 500g±0.5g

Pretension 5to45g

ImagingDevice CCDcamerawith3.5micronprecision

ScanRate 0.5mm

Electrical 115or230VAC-50-60Hz(singlephasepower)

PowerConcumption 2.4KW(ESTmachine&Computer/Printer)

Air 100psi(7bar)Clean&MoistureFreeInstrumentAir

Dimensions 76x155x61cm(30x61x24in)

Weight 115kg(250lbs)

TheEntanglementStrengthTesteranalyzestheyarntosimultaneouslymeasurethenumberofentanglementspermeterandlengthoftheentanglementskips.Thesystemusesatwozonetransportsystem,firsttoremovetheentanglementsandsecondtoprovideconstanttensionforoptimumentanglementcountmeasurement.

Thetransportsystemusesstateof theartcontrolsystemtoensuretheyarn isunderpreciseelongation%that isdesiredbyenduserrequirementsinZone1,whichisalsoknownasDrawZone.

AstheyarnpassesthroughtheDrawZone,thehighresolutionTensiondevicemeasuresthetensiondevelopedontheyarnastheentanglementarebeingremoved.Dependingonthestrengthoftheentanglement,thistensionvaluecanbehighorlowforstrongorsoftentangledyarnsrespectively.

AssoonastheyarnleavestheDrawZone,itenterstheEntanglementMeasurementZoneundercontrolledtension.Inthiszone,aCCDcameracollectstheyarndiameterinformationwithprecisionof3.5micron.Thediameterdataisusedtoidentifyandcounttheentanglementsandentanglementskipsintherunningyarn.

ThecompleteESTtestroutinewillincluderunningtheyarnatareferencecondition,normallyat0%elongationandthistestresultwillbeusedasthebaselineforEntanglementStrength(ES%)calculations.Afterthereferencestepisfinished,theESTwillstartdrawingtheyarn,upto20stepspertestandwillcollecttheentanglementdataateachstep.TheEntanglementStrengthwillbecalculatedasthe%entanglementsremainingintheelongatedyarnafteritissubjectedtothedesireddrawconditions.

Afullstatisticalreportforeachbobbinisavailableattheendofeachtest.

Thisdual zoneapproach tomeasuring theentanglement strengthautomates themanualmethod, thusprovidingahighlyefficient,repeatable,preciseprocedurethatisfreefromtheinfluenceofhumanerror.

EST SOFTWARE

• Easytousemenustructure

• AutomaticTestParameterSetupusingcamerawizard

• Entanglementpermetercount,EntanglementStrength%(ES%),EntanglementSkipdataincludingSkipAveragelength,MaxSkiplength,SkipsCV%andStandardDeviation(SD)foreachpackage

• Alldiameterdatastoredforeachtest,Easytorecall

• Abilitytosetrejectlimitstosortthepackages

• Customizablesummaryreports

• HistogramsandSkipdistribution

• GraphsforEntanglementStrengthandEntanglementCount

• Abilitytoexporttestdatatocommonfileformats

ENTANGLEMENT STRENGTH TESTERENTANGLEMENT STRENGTH TESTER

EST GRAPHICSWHY IS ENTANGLEMENT STRENGTH IMPORTANT?

• Abilitytostoreandviewyarnimages

• Abilitytoviewandcomparedifferentsectionsoftheyarnwithreferenceyarn

• Abilitytosavetheyarnimageincommonfileformats

Syntheticyarnsarecomprisedofmultiplefilamentsformingayarn.Entanglingtheyarnisoneofthemostcommonmethodstoprovidecohesivestructuretothefilamentbundlesothatwecanusetheyarnduringthefabricformation.

Duringbeaming,weavingorknitting,theyarnwillbeexposedtovariouslevelsoftension.Itisimportantthattheyarnhasnotonlysufficientnumberofentanglements,butalsohasentanglementsofcertainstrengthtoresistopeningup,thuslosingthecohesiveyarnstructuretocompletetheweavingorknittingprocesswithminimummachinedowntime.

SoftEntanglementsorStrongEntanglementsarecommontermstodefinethestrengthoftheentanglements,whereassoftreferstotheentanglementsthatareweakandcanbeeasilyremovedandstrongreferstotheonesthatresistremoval.

Toachievehighefficiencyduring fabricproduction, theentanglementsneed tobeevenlydistributedandof similarstrength levels. Problems developwhen bobbins from the same lot have different entanglement strength levels orentanglementstrengthchangesduetovariationsinairpressurethroughtheentanglementjetswithinthesameyarnpackage.

MissedorweakentanglementsresultinEntanglementSkips,wheretheyarncohesivenessisnolongermaintained.Inadditiontocreatingfabricproductionproblems,EntanglementSkipsarealsoknowntocausestreakinessinknitandwovenfabrics.Therefore,itiscriticaltomeasuretheentanglementstrengthandskipdistributionintheyarnstoprovidesimilarqualityyarnstofabricprocesstominimizemachinedowntime,thusresultingahighlyefficientfabricproduction.