Yas extrusion ntawm raj, hose thiab yeeb nkab yog ib qho txheej txheem khov kho rau kev hloov cov khoom siv thermoplastic rau cov khoom tiav los yog ze-tiav lawm.Cov khoom siv raw feem ntau yog nyob rau hauv daim ntawv ntawm cov yas pellets lossis hmoov.Kev hloov dua siab tshiab yuav tshwm sim los ntawm kev tsim ib homogeneous molten loj nyob rau hauv lub extruder thiab yuam nws nyob rau hauv siab los ntawm ib tug extrusion tuag orifice uas txhais cov duab ntawm cov khoom cross section.Cov khoom tsim, lossis extrudate, yog txias thiab rub tawm ntawm qhov tuag tawm ntawm tus nqi tswj.Tom qab ntawd lub extrudate tuaj yeem raug mob ntawm ib lub spool, txiav mus rau qhov ntev ntev, lossis coj mus rau lwm txoj hauv kev.
Los ntawm kev sib piv nrog kev txhaj tshuaj molding lossis tshuab molding, uas yog cov txheej txheem cyclic, extrusion yog txheej txheem khov kho.Tus cwj pwm tsis tu ncua no ua rau qee cov txiaj ntsig tshwj xeeb thiab cov teeb meem raws li kev tsim khoom.Extruded khoom yog ntev heev thiab tsis tu ncua, thiab muaj ib tug ntoo khaub lig seem uas feem ntau yog tas mus li ntawm kev hwm rau lub axis los yog kev taw qhia ntawm ntau lawm.Cov khoom txhaj tshuaj molded yog cov khoom sib cais uas muaj qhov sib txawv ntawm qhov sib txawv ntawm txhua qhov axis.Qhov tseeb tias qhov extrusion ntawm lub raj, hose thiab cov yeeb nkab yog cov txheej txheem tsis tu ncua yuav tau tham nyob rau hauv ntau qhov chaw ntawm kab lus no.Lub ntsiab lus siv los piav txog cov raj, hose thiab cov yeeb nkab sib txawv ntawm kev lag luam mus rau kev lag luam.
Khoom siv
Cov khoom tseem ceeb ntawm lub raj, hose, lossis cov yeeb nkab extrusion feem ntau muab faib rau hauv cov khoom uas yog cov dej ntws ntawm extruder, lub extruder nws tus kheej, thiab cov uas yog downstream ntawm extruder.Upstream Cheebtsam muaj xws li resin tuav cov khoom siv rau kev xa cov ntaub ntawv raw mus rau lub extruder, thiab cov khoom cua txias uas yuav ua kom sov cov resin ua ntej, los yog tswj cov dej noo ntawm cov resin ua ntej nws nkag mus rau hauv extruder pub caj pas.Cov khoom siv hauv qab no suav nrog cov lim dej lim lossis cov tshuaj ntsuam hloov pauv, lub tshuab extrusion tuag sib dhos, lub quench lossis lub tshuab nqus tsev sizing tank, txhua yam khoom ntsuas ntsuas, cov khoom siv extrusion kab ceev tswj hauv daim ntawv ntawm txoj siv rub lossis nip yob teeb, thiab thaum kawg ib yam khoom. cov cuab yeej txiav tawm lossis cov khoom siv winding.Muaj cov txheej txheem extrusion ntxiv uas yuav coj cov khoom extruded ncaj qha mus rau hauv lwm txoj hauv kev rau kev sib ntxiv ntawm kev txhawb nqa braiding lossis ntxiv rau lwm cov txheej txheej lossis cov txheej txheem cob.
Khoom siv
Cov txheej txheem Extrusion tuaj yeem siv los ua cov txheej txheem feem ntau cov thermoplastics thiab qee cov thermoset yas.Cov resins feem ntau extruded rau raj, hose thiab yeeb nkab khoom muaj xws li siab thiab tsawg ntom polyethylene, polypropylene, polyurethane, polystyrene, fluoropolymers, PTFE, polyester, thiab saj zawg zog thiab nruj PVC.Ib tug yam ntxwv uas feem ntau sib txawv extruded resins los ntawm txhaj-molded resins yog yaj viscosity ntawm cov yas ntawm ib txwm ua kub.Extruded plastics feem ntau muaj ntau dua yaj viscosity, uas tso cai rau lub extrudate khaws cov duab imparted rau nws los ntawm cov tuag thaum lub extrudate nyob rau hauv lub quenching theem.Combinations ntawm ntau yam resins yuav siv tau kom tau tshwj xeeb lub cev, lom, los yog tshuaj lom neeg zog.Ntau cov additives tuaj yeem siv thaum lub sij hawm extrusion txheej txheem los txhim kho cov yam ntxwv ntawm cov polymer lossis hloov cov khoom siv.Cov additives xws li lubricants, thermal stabilizers, antioxidants, radiopacifying agents, thiab colorants.
Cov Txheej Txheem Ua Haujlwm
Cov tsis tseem ceeb rau kev ua extrusion zoo ib yam li cov txheej txheem txhaj tshuaj molding.Resin kub, resin siab, resin ya raws cov ntsiab lus, ntsia hlau ceev, thiab ntsia hlau lub cev muaj zog amperage feem ntau yog tswj los yog saib xyuas kom muab ib homogeneous yaj ntawm ib tug tswj volumetric npaum li cas.quenching kub thiab tus nqi ntawm cov extrudate yog kos yog tswj los yog saib xyuas kom muab ib tug tswj cov khoom loj.Kev ntsuas qhov ntev, siv ntau txoj kev ntsuas, tuaj yeem raug coj los ntawm extrudate raws li nws tsim.Hauv kev sib piv rau kev txhaj tshuaj molding, extrusion tuaj yeem sib txawv qhov loj ntawm cov khoom kawg yam tsis tau hloov cov cuab yeej tuag.Common extrusion ntau lawm tolerances los yog txheej txheem sib xws yog tuav nyob rau hauv 1% ntawm nominal ntsuas tus nqi.Raws li cov txheej txheem tsim khoom no suav nrog cov xwm txheej tsis tu ncua, txhua qhov kev txiav txim uas tuaj yeem ua kom ruaj khov ib qho kev ntsuas lossis qhov xwm txheej yog qhov zoo rau cov txheej txheem.
Post lub sij hawm: May-09-2017