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FEATURES ENTANGLEMENT STRENGTH TESTER LH-485 EST • Entanglement Testing System for running and applying up to 20 Elongation steps to the yarn under test • Dual Zone transport with Draw Zone and Measurement Zone tension monitoring • Draw selectable in 0.5% Elongation steps • Selectable testing speed 50 to 400m/min • Draw Zone Accuracy ± 0.1% elongation • Draw Tension measurement 0 to 1000 grams • Pretension adjustable 5 to 45 grams • CCD camera, capable of measuring every 0.5 mm of yarn with precision of 3.5 micron • Self contained yarn waste bin *All specifications are subject to change. Lawson Hemphill Inc. 1658 G.A.R. Highway, Unit 6 Swansea, MA 02777 USA Phone: +1 508 679 5364 [email protected] www.lawsonhemphill.com Contact us today for more information on any Lawson-Hemphill product! ENTANGLEMENT STRENGTH TESTER MODEL LH-485 Entanglement Strength Tester Speed 50 to 400m/min Yarn Count Range 22 to 1500 denier entangled DTY, FDY, POY Draw Zone User selectable 20 Elongation steps with ± 0.1% precision Max Elongation 25% Draw Zone Tension 1000g ± 0.5g Measuring Zone Tension 500g ± 0.5g Pretension 5 to 45g Imaging Device CCD camera with 3.5micron precision Scan Rate 0.5 mm Electrical 115 or 230 VAC- 50-60 Hz (single phase power) Power Concumption 2.4 KW (EST machine & Computer/Printer) Air 100 psi (7 bar) Clean & Moisture Free Instrument Air Dimensions 76 x 155 x 61cm (30 x 61 x 24in) Weight 115 kg (250 lbs) The Entanglement Strength Tester analyzes the yarn to simultaneously measure the number of entanglements per meter and length of the entanglement skips. The system uses a two zone transport system, first to remove the entanglements and second to provide constant tension for optimum entanglement count measurement. The transport system uses state of the art control system to ensure the yarn is under precise elongation % that is desired by end user requirements in Zone 1, which is also known as Draw Zone. As the yarn passes through the Draw Zone, the high resolution Tension device measures the tension developed on the yarn as the entanglement are being removed. Depending on the strength of the entanglement, this tension value can be high or low for strong or soft entangled yarns respectively. As soon as the yarn leaves the Draw Zone, it enters the Entanglement Measurement Zone under controlled tension. In this zone, a CCD camera collects the yarn diameter information with precision of 3.5 micron. The diameter data is used to identify and count the entanglements and entanglement skips in the running yarn. The complete EST test routine will include running the yarn at a reference condition, normally at 0% elongation and this test result will be used as the baseline for Entanglement Strength (ES%) calculations. After the reference step is finished, the EST will start drawing the yarn, up to 20 steps per test and will collect the entanglement data at each step. The Entanglement Strength will be calculated as the % entanglements remaining in the elongated yarn after it is subjected to the desired draw conditions. A full statistical report for each bobbin is available at the end of each test. This dual zone approach to measuring the entanglement strength automates the manual method, thus providing a highly efficient, repeatable, precise procedure that is free from the influence of human error. EST SOFTWARE • Easy to use menu structure • Automatic Test Parameter Setup using camera wizard • Entanglement per meter count, Entanglement Strength % (ES%), Entanglement Skip data including Skip Average length, Max Skip length, Skips CV% and Standard Deviation (SD) for each package • All diameter data stored for each test, Easy to recall • Ability to set reject limits to sort the packages • Customizable summary reports • Histograms and Skip distribution • Graphs for Entanglement Strength and Entanglement Count • Ability to export test data to common file formats

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Page 1: ENTANGLEMENT STRENGTH TESTER · ENTANGLEMENT STRENGTH TESTER MODEL LH-485 Entanglement Strength Tester Speed 50 to 400m/min Yarn Count Range 22 to 1500 denier entangled DTY, FDY,

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: [email protected] 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

Page 2: ENTANGLEMENT STRENGTH TESTER · ENTANGLEMENT STRENGTH TESTER MODEL LH-485 Entanglement Strength Tester Speed 50 to 400m/min Yarn Count Range 22 to 1500 denier entangled DTY, FDY,

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.


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