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Two more effective cleaning agents for starting the double screw extruder

Two more effective cleaning agents for starting the double screw extruder

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  • Time of issue:2020-07-30 17:47
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(Summary description)Next,Iwillgiveyouabriefintroductiontotwomoreeffectivecleaningagentsforstartingthedoublescrewextruder:    1.Mixture:50%HDPE+50%diatomaceousearth    2.Mixture:HDPE+water+decontaminationpowder.TheHDPEisfedintothescrewattheusualspeedatthemeltingtemperature.Stirthedecontaminationpowderwithwaterinabuckettoformaslurry,andslowlyaddtheslurryfromthemainfeedport.Theseslurriesimpact,rub,andcleanthescrewduetofoaming.    Formoreinformationabouttwinscrewextruders,pleasevisithttp://www.njjl.com/

Two more effective cleaning agents for starting the double screw extruder

(Summary description)Next,Iwillgiveyouabriefintroductiontotwomoreeffectivecleaningagentsforstartingthedoublescrewextruder:    1.Mixture:50%HDPE+50%diatomaceousearth    2.Mixture:HDPE+water+decontaminationpowder.TheHDPEisfedintothescrewattheusualspeedatthemeltingtemperature.Stirthedecontaminationpowderwithwaterinabuckettoformaslurry,andslowlyaddtheslurryfromthemainfeedport.Theseslurriesimpact,rub,andcleanthescrewduetofoaming.    Formoreinformationabouttwinscrewextruders,pleasevisithttp://www.njjl.com/

  • Categories:company news
  • Author:
  • Origin:
  • Time of issue:2020-07-30 17:47
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Information
Next, I will give you a brief introduction to two more effective cleaning agents for starting the double screw extruder:
 
     1. Mixture: 50% HDPE+50% diatomaceous earth
 
     2. Mixture: HDPE+water+decontamination powder. The HDPE is fed into the screw at the usual speed at the melting temperature. Stir the decontamination powder with water in a bucket to form a slurry, and slowly add the slurry from the main feed port. These slurries impact, rub, and clean the screw due to foaming.
 
     For more information about twin screw extruders, please visit http://www.njjl.com/

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About the structure process analysis of twin screw extruder

About the structure process analysis of twin screw extruder

Next,theeditorofJuliwillgiveyouabriefintroductionaboutthestructureandprocessanalysisofthetwin-screwextruder:  1.Plasticizingarea  Theplasticizingzoneistoheattheinjectedresintoformamoltenstate.Theconditionssuchastheheatingtemperatureandtimeinthisregionarenotparticularlylimitedaslongasthefluoropolymerhavingaspecificunstableterminalgroupisinamoltenstate.Inthelatterhalfoftheplasticizationzone,itispreferabletoprovidedevolatilizationholestoremoveatleastapartofvolatilecomponentsundernormalpressureorreducedpressure.Then,thepartialpressureofvolatilecomponentsinthestabilizationregiondescribedlatercanbereduced,andthestabilizationtreatmentcanbeeffectivelypromoted.  2.Stabilizationtreatmentarea  ThestabilizationzoneistomeltandkneadandconvertspecificunstableendgroupsintoaCF2H.Thestabilizationtreatmentareaispreferablyformedbyusingakneadingdiscwithoutpropulsion.Here,melt-kneadingiscarriedoutinthepresenceofwaterandoxygen.Itcandirectlyintroducepurewater,ionexchangewater,etc.orwatervapor;itcanalsobeaccompaniedbythefluoropolymertobetreated.Theamountofwateraddedisthesameasthenumberofunstableterminalgroups,butitisactuallypreferabletosupplyanexcessamount,forexample,atleast10timestheamount.Thepressureinthestabilizationzoneisgenerallycontrolledat0.2~10MPa,andthesettemperatureiscontrolledat280~430℃.Thetimetomaintainpressurizationisusuallylessthan10minutes.  Accordingtotheprincipleoftheextrudertoremoveunstableendgroups,themelt-kneadinginthestabilizationzoneispreferablycarriedoutinthepresenceofoxygeninadditiontothepresenceofwater.Airisusuallyusedintermsofeconomy.Inthepresenceofoxygen,thecarbongeneratedbythemoltenkneadedproductisalsoburned,whichcaninhibitthecoloringofthefluoropolymer.Oxygenisaninertgastotheunstableterminalgroupscarboxylandfluorinatedacylgroups.Duringtheprocessofmeltingandkneading,itcanimprovethedevolatilizationefficiencyofvolatilecomponents.  Three,devolatilizationarea  Thedevolatilizationzoneremoveshigh-temperaturevolatilecomponentsgeneratedbythedecompositionofspecificunstableterminalgroups.Theabsolutepressurevariesaccordingtothemoltenstateofthemoltenkneadedproductandtheoperatingconditionsofthescrewofthekneader.Generally,thepressureisreducedtothepointwherethemoltenkneadedproductdoesnotintrudeintotheexhaustnozzle.Itcanbe0.01to0.1MPa,andthetemperatureiscontrolledat25O~Claughataround.  Inthepresenceofacertainamountofwaterandoxygen,FEPextrudingthroughatwin-screwextrudercaneffectivelyremovetheunstableterminalgroupsofFEP.SimplifiestheprocessingprocessofFEPunstableendgroupsandsavesproductioncosts.Whentheobtainedstabilizedpolymerismelt-formed,nobubblesorvoidsaregeneratedinthefinishedproduct,anditisnotcolored. Formoreinformationabouttwinscrewextruders,pleasevisithttp://www.njjl.com/
发布时间 : 2020-07-30 点击 : 0

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