coolcorrectly

APPLIANCES///HOWTOCORRECTLYMEASURESINGLEWALLTUBINGWhitePaperHOWTOCORRECTLYMEASURESINGLEWALLHEATSHRINKABLETUBINGTEConnectivityHeatShrinkTubingAPPLIANCES///HOWTOCORRECTLYMEASURESINGLEWALLTUBINGHowtoCorrectlyMeasureSingleWallTubingWhitePaperInsideDiameter(ID),OutsideDiameter(OD),andWallThicknessItisimportanttoremember,whenmeasuringODorIDheatshrinkabletubingcanbeeasilystretched.
Whatthismeansinpracticaltermsis,ifyouusemosttraditionalwaystomeasureinsidediameteryoucaneitherstretchthetubingorcauseittodeformtobemoreovalthanround.
Inbothcasesyoucangetanincorrect,largerreadingthanwhatthetruediameteris.
ItshouldbenotedthatmosttubingdoesnothaveamaximumID/ODspecificationintheexpandedform(asreceived).
ItistheminimumIDthatisimportantbeforerecovery,andthemaximumIDafterrecovery.
Togetaroundthisproblem,thebestmethodinvolvesusingasetofpluggagesofknownsizestodeterminetheIDoftubing.
Thiscausesthetubingtoseeuniformforceallthewayaroundandpreventsitfrombeingpulledintoanoval.
Startwithasizeatthelowendofthespecificationandslowlyputlargerandlargerpluggagesinthetubinguntilyoufindonethatwillnotgoineasily.
Wetakethepluggagessotheyslideeasilyanddon'thangupinelastomersandveryflexibletubing.
Youdonotwanttoforceitinasyoucouldstretchthetubinggivingyouafalse,highreading.
ThelargestgagethatslidesinsnuglyistheIDofthetubing.
OnceyouhaveidentifiedthecorrectID,theODcaneasilybemeasuredwithasetofcaliperswhilethepluggageisstillinside.
Thiswillkeepyoufromaccidentlycompressingthetubingandgettingafalse,lowreading.
Wallthicknessshouldonlybemeasuredonfullyrecoveredtubing.
Youstartbyrecoveringasampleinanovenorheatgunandlettingitcooluntilyoucanhandleitwithyourhands.
ThenmeasuretheIDandODasabove.
AveragewallthicknesscantheneasilybecalculatedbysubtractingtheIDfromtheOD.
Youcanuseapinmicrometertogetsinglepointmeasurementsofthewall.
However,beverycarefulwiththeforceappliedasthemicrometercancompressthetubingcausingfalselowreadings.
Dualwall(adhesivelined)tubingneedstobetreateddifferentlybecausetheadhesivewillmeltandflow.
AskyourFAEforadditionaladviceonmeasuringtherecovereddimensionsofdualwalltubing.
ColorWhenthetubingisexpandeditbecomesalightercolor.
Blackcanbecomegrey,redcanturnmoreofapinkcolor,etc.
Whatthismeansisthatthecolorasreceivedmaynotbethefinalcolorafteritisrecovered.
Thisisnotadefect,ascolorisjudgedontherecoveredtubing,nottheasreceived(orfullyexpanded)tubing.
Asampleshouldbecut,fullyrecoveredandallowedtocooltoproperlyevaluatethecolor.
INTRODUCTION:HOWTOCORRECTLYMEASURESINGLEWALLHEATSHRINKABLETUBINGHeatshrinkabletubingissoftandstretchable.
Inadditionitchangesshapewhenitisrecovered(Shrunk).
Thispaperisintendedtogiveguidelinesonhowtocheckthemostcommonmeasurementswhenmeasuringthedimensionsofheatshrinkabletubing.
PleaseremembertocheckwithSalesorFieldApplicationEngineeringifyouhaveanyspecificquestionsaboutmeasuringthetubing,orfiguringoutwhichtypeandsizeoftubingiscorrectforyourapplication.
INCORRECTIDTUBINGISSTRETCHEDCORRECTIDPLUGGAGEKEEPSTUBINGROUNDINCORRECTODTUBINGISCOMPRESSEDINTOANOVALSHAPECORRECTODPLUGGAGEKEEPSTUBINGFROMBEINGSQUEEZEDPAGE3HowtoCorrectlyMeasureSingleWallTubingWhitePaperLongChangeIngeneral,justastubingwillshrinkindiameterwhenheated,itwillalsoshrinkinlength.
Thisisknownbymanytermsincluding;LongChange,LongitudinalChange,andShrinkage.
Nomatterwhattermyouuse,itisa%measurementofhowmuchthetubingshortenedduringrecovery.
Thetypicalspecificationfortubingis+0/-10%.
However,thisdoesnotapplytoallheatshrinktubing,somakesureyoureviewwhatthespecificationisforthetubingyouareusing.
Aswithothermeasurements,theprocessseemssimple.
Measureapieceoftubing,thenrecoverit,measureitasecondtime,andusethefollowingformula:LongitudinalChange:%L.
C.
=(L1-L2)/L2X100Where:L1=LengthafterrecoveryL2=LengthbeforerecoveryAlthoughtheformulaseemseasy,thereareanumberofsimpleerrorsthatcanleadtoincorrectmeasurements.
Theseare:ThemeasurementtoolnotbeingaccurateenoughtomeasurethesmallchangeSolution:UseameasurementtoolwithbetterresolutionorlongerpieceoftubingTheoventemperatureistoolowandtubingmaynotshrinkfully.
Shrinkageisonlyguaranteedfortubingrecoveredatthecorrecttemperature.
Solution:Makesureyouuseanovenorheatguncapableofmaintainingthecorrecttemperature.
Whenusinganoven,thetubingcanbestickywhenhotandsticktothesurfaceofthetraywhenheated,keepingitfromshrinkingasmuchasitwouldhaveotherwise.
Solution:Recoveronwireracksorontraysthathaveanon-sticksurfacetominimizethetubingsticking.
Atraywithtalcinitcanalsobeused.
Thetubingstretchedduringmeasurementspriortorecovery,causingittoshrinkmorethanexpectedSolution:Carehastobetakenwhenhandlingthetubingduringtheapplicationandwhenpreparingthesample.
ConclusionDuetothefactheatshrinktubingbyitsverynatureisstretchyandchangesshape,caremustbetakenwhenmakingdimensionalmeasurements.
However,byusingthetechniquesinthispaperyoushouldbeabletogetaccurateandconsistentresults.
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