Hauv kev ua cov khoom siv yas thiab cov khoom siv polymer, tus yuam sij rau kev nruam thiab ua tau zoo molding txheej txheem ntawm extruders nyob rau hauv lub synergistic nyhuv ntawm lawv cov tub ntxhais ua hauj lwm units - chim thiab ntsia hlau. Structurally, lawv yog interdependent, thiab functionally complementary, ua hauj lwm ua ke los hloov cov khoom raw rau hauv ib homogeneous yaj thiab tsim kom ruaj khov extrusion siab thiab txaus tus nqi. Qhov no muab ib qho tseem ceeb lav rau qhov zoo thiab kev ua tau zoo ntawm ntau yam khoom.
Lub thoob ua lub luag haujlwm tseem ceeb hauv cov txheej txheem extrusion los ntawm kev muab cov khoom zoo li qub thiab tsim kom muaj ib puag ncig thermal. Nws cov duab cylindrical nrog ntev ntev - txog - txoj kab uas hla muab kev ncig mus los thiab cov tshuaj tiv thaiv nyob deb ntawm cov khoom, tso cai rau cov cua sov maj mam nkag mus rau ntawm qhov chaw mus rau sab hauv, ua tiav kev hloov pauv ntawm cov khoom mus rau lub xeev molten. Cov phab ntsa sab hauv tau txais kev ua haujlwm zoo thiab hnav- thiab corrosion- kev kho mob resistant, txo cov dej tsis kam thaum lub sij hawm cov khoom propulsion thiab tswj cov qauv kev ncaj ncees thiab seem stability nyob rau hauv kub thiab siab tej yam kev mob. Los ntawm ib qho los yog segmented cua sov thiab cua txias layout, lub chim yuav tsim ib tug precisely controllable kub teb raws li axial kev taw qhia, ua tau raws li qhov sib txawv ntawm cov cua sov input yuav tsum tau ntawm txawv seem. Qhov kev tswj xyuas thermal no tsis yog tsuas yog txhim kho kev siv hluav taws xob zoo xwb tab sis kuj tseem cuam tshuam qhov degradation ntawm cov cua sov- cov khoom rhiab heev, ua kom cov txheej txheem kev nyab xeeb thiab rov ua dua.
Cov ntsia hlau plays lub luag haujlwm tseem ceeb hauv lub system rau dynamic plasticization thiab conveying. Cia siab rau nws txoj kev sib hloov nyob ib ncig ntawm nws axis, nws helical ridges thiab channels hloov txhua yam zog mus rau pem hauv ntej txav quab yuam ntawm cov khoom, thaum tib lub sij hawm tsim ib tug adjustable shear teb nyob rau hauv cov raws. Kev taw qhia los ntawm cov ntsia hlau, cov khoom ua ntu zus tau txais kev cog lus thiab xa mus rau hauv ntu pub, compaction thiab melting nyob rau hauv seem compression, thiab homogenization thiab pressurization nyob rau hauv lub metering seem, maj mam ua kom tiav cov transformation ntawm nws daim ntawv thiab cov khoom. Cov ntsia hlau lub geometric tsis (xws li nam piv, compression piv, channel qhov tob, thiab suab) txiav txim siab tus nqi conveying, shear zog, thiab lub sij hawm nyob, yog li tso cai rau tshwj xeeb tsim rau cov ntaub ntawv nrog txawv viscosities, thermal zog, thiab cov hom phiaj ua. Cov ntsia hlau yog tsim rau kev tsim khoom loj ntawm - lub hom phiaj plastics, thaum tshwj xeeb - cov qauv ntsia hlau xws li barrier - hom, tus pin- hom, corrugated, los yog sib cais screws, los ntawm kev ntxiv shearing thiab mixing units, txhim khu lub peev xwm ua kom muaj peev xwm ua tau zoo heev, ntau yam -cov khoom siv{9}}, los yog cov ntaub ntawv nyuaj heev
Lub synergistic nyhuv ntawm lub chim thiab ntsia hlau yog raws li nyob rau hauv tas li unidirectional ntws nyob rau hauv ib tug confined qhov chaw. Lub thoob muab kev txhawb nqa ruaj khov thiab ciam ciam teb rau qhov kev sib hloov ntawm cov ntsia hlau, kom ntseeg tau tias kev sib tsoo thiab kev xa tawm tau sib npaug sib npaug ntawm cov khoom hla -section. Cov ntsia hlau, los ntawm cov khoom siv hluav taws xob nkag, cua sov, compacts, thiab hloov cov khoom mus rau hauv cov yaj, thaum tib lub sij hawm tsim kom muaj qhov hluav taws xob ruaj khov thiab ntws tus nqi nyob rau hauv seem metering. Lub radial clearance ntawm ob yog nruj me ntsis tswj kom tsawg kawg nkaus los tiv thaiv cov ntaub ntawv rov qab thiab uneven plasticization, thiab kom txo tau kev sib txhuam los. Qhov kev sib koom ua ke no ua kom muaj kev sib txuas ntxiv, kev ruaj ntseg, thiab rov ua dua ntawm cov txheej txheem extrusion, ua rau cov khoom siv los hloov cov ntaub ntawv raw mus rau hauv cov khoom tiav nrog cov qauv zoo ib yam thiab txhim khu kev qha, ua rau nws siv tau rau ntau yam khoom xws li zaj duab xis, kav dej, nplooj ntawv, cable coatings, thiab profiles.
Los ntawm kev xav txog kev siv tshuab, lub thoob lub thermal tswj thiab cov ntsia hlau lub zog hloov pauv yog kev sib koom ua ke, sib koom ua tiav morphological transformation thiab tivthaiv homogenization. Qhov no yog lub hauv paus tseem ceeb rau kev siv dav siv tshuab extrusion. Kev nkag siab txog kev sib koom ua ke ntawm ob lub ntsiab lus no tsis yog tsuas yog pab txhim kho cov txheej txheem tsis zoo thiab txhim kho cov khoom lag luam zoo tab sis kuj tseem muab kev txhawb nqa theoretical thiab kev coj ua zoo rau kev tsim cov khoom siv tshiab thiab txhim kho cov khoom siv nrog kev txawj ntse.
