Coextrusion yog tus txheej txheem ntawm nias ob los yog ntau cov ntaub ntawv los ntawm tib tuag los tsim ib qho. Thaum plastics ntau los sib xyaw ua ke, cov txiaj ntsig tau tuaj yeem ua rau cov khoom sib txawv los ntawm cov khoom ntawm ib yam khoom nkaus xwb. Coextrusion tau qhib cov kev thaj tsam tshiab hauv cov khoom tsim qauv thiab hais txog ntau yam kev lag luam ntau yam tsim nyog.
Coextruding lub stripe ntawm radiopaque yas mus rau hauv ib lub catheter, piv txwv li, txhim kho x-ray zoo raws li tus catheter tsiv los ntawm ib tug hlab ntsha tsis tau compromising cov hauj lwm zoo ntawm catheter nws tus kheej. Coextrusion kuj tuaj yeem txo cov nqi los ntawm kev siv cov khoom siv thiab cov khoom seem hauv cov ntaub ntawv pov thawj, cov laj kab thiab lwm daim ntaub ntawv. Cov txheej txheem tuaj yeem raug pom hauv cov haujlwm uas muaj ntau yam xws li tubing thiab cov yam ntxwv ntawm cov khoom lossis cov cua uas muaj cua txias.
Lub Coextrusion Kev Soj Ntsuam
Nyob rau hauv standard extrusion, khoom yas pellets yog gravity pub rau hauv ib tug qauv mechanism, qhov twg jacketed compression screws yaj thiab pub cov ntaub ntawv rau hauv ib tug tuag. Ntawm qhov sib txawv, coextrusion yuav muaj ntau yam extruders ua tus fawm kib los yog qhov chaw nkaum. Qee lub sij hawm tsib los yog ntau dua cov ntaub ntawv siv rau hauv ib lub voj voog, nrog txhua tus extruder delivering tus nqi npaum molten yas rau lub lag luam ..
Tsis zoo li zoo tib yam yas yas, txhua tus neeg yas khaws nws cov khoom qub, tab sis muab tso ua ke rau hauv ib qho chaw sib xyaws. Yog hais tias xyaw ua ntej extrusion, tus yam ntxwv ntawm cov khoom hauv tus neeg yuav hloov, tab sis qhov kawg tshwm sim yog homogeneous khoom.
Tsis yog tag nrho cov khoom tsim rau coextrusion vim qee tus polymers yuav tsis koomtes rau lwm tus, txawm tias plaug cov txheej txheem nruab nrab ntawm txheej txheem feem ntau yuav daws tau qhov teeb meem no. Plastics nrog ntau txawv melting kub kuj tsis zoo rau txoj kev, raws li degradation yuav tshwm sim nyob rau hauv cov khoom siv qis dua. Thaum kawg, PVC thiab acetals yuav tsum tsis txhob coextruded ua ke vim hais tias ntawm kev sib tsoo feem ntau uas tshwm sim thaum lawv koom.
Coextruded Tubing
Cov xim uas muaj xim ntau ntau yog ib qho piv txwv zoo ntawm kev sib koom tes tsim qauv. Cov kab txaij (striped tubing) kuj muaj ntau lub hom phiaj rau hauv kev kho mob, uas cov kab txaij thiab xim muaj peev xwm qhia tau ntau yam tshuaj. Coextrusion tuaj yeem tsim hluav taws xob hauv cov hlab ntim hauv nruab nrab ntawm cov hlua yuav khiav thaum tuav lub raj ua kom yooj yim. Lwm cov hlab nyiaj tau los ntawm kev ua haujlwm siab txog cov kab xev xa mus rau corrosives, los yog ib qho pheej yig dua ntxiv ntxiv thiab ruaj khov. Tsis tas li ntawd, cov yas fiber optic cables yog tsim los ntawm ib lub xov tooj sib tsho thiab lub tsho loj.
Coextruded Tej Tsev Kawm Ntawv
Yas siv qee zaum siv los ua ntoo. Cov kws ua lag luam tuaj yeem tsim kev caij nkoj, nkoj nkoj, lub ntsej muag thiab cov khoom ua haujlwm nrog "yas lumber," uas muaj qee qhov zoo tshaj ntuj ntoo. Coextrusion yog ib txoj kev siv nyiaj txuag ntawm ntau yam ntawm cov ntaub ntawv khoom neeg tsim khoom. Nws tuaj yeem ntxiv titanium dioxide, khoom cua resistant, rau sab nrauv ntawm cov khoom ua los yog tsim decking nrog ib txheej puab ntawm yas yas.
Tshuab Moulding
Hauv tshuab molding, yas yog extruded rau hauv cov hlab uas hlais ntev thiab cov ua nyob rau hauv pwm. Cov cua ntsawj txias ces muab cov ntawv no tso rau hauv cov kab noj hniav uas muab cov khoom tso rau hauv nws daim ntawv kawg. Tshuab moulded khoom, xws li fwj, feem ntau yog siv hauv cov zaub mov thiab cov tshuaj pleev ib ce. Yuav kom nce lub khoom txee lub neej, ib txheej barrier yog coextruded rau hauv yas los tiv thaiv lub thawv ntawm leaching gases, aromas thiab ya raws. Breweries tseem siv coextruded plastics rau npuas cov khoom vim lawv cov khoom ntxeem tsis ntxeem kom ze cov iav thiab txhuas.
Lub zog kev lag luam muaj kev sib koom tes los pab ua kom tau raws li cov qauv kev tso tawm. Ethylene Vinyl Alcohol (EVOH) yog coextruded nrog ntau yam polyethylenes los tsim cov pa roj ntsha cov pa roj carbon dioxide uas ua tau raws li cov kev cai ntawm ib puag ncig. Kuj ceeb tias, EVOH kuj yog txhua yam khoom siv tiv thaiv kev siv hauv mayonnaise, taub kua txiv hmab txiv ntoo thiab cov khoom noj rau me nyuam mos. Txawm tias tau teev npe li zaub mov, nws feem ntau sandwiched ntawm ob txheej ntawm substrate. Transparent ntim rau cov vitamins thiab pharmaceuticals tseem ua nrog coextruded EVOH.
Ntawv Cov Ntawv
Cov neeg tsim khoom coextrude polycarbonate thiab acrylic sheeting rau daim UV thiab qhov teeb meem qhov teeb meem uas cuam tshuam cov teeb meem thaum pom lub teeb pom kev kom dhau. Cov ntawv txheeb coextruded no tiv taus deterioration ntawm lub teeb raug, thiab tsis daj nrog lub sijhawm. Ib qho khoom ua rau abrasion-resistant tej zaum kuj yuav coextruded rau daim ntawv saum npoo ntxiv tiv thaiv los ntawm yaig.
Lub neej yav tom ntej ntawm Coextrusion
Txawm hais tias compound khoom muag twb pom ntau yam kev siv hauv kev kho mob, khoom noj khoom haus, thiab energy industries, coextrusion tseem nthuav nws txoj kev ua haujlwm. Txij li cov hauj lwm zoo ntawm nws cov khoom yog nyob ntawm kev sib txuam ntawm cov khoom siv hauv txoj kev, discovering zaum yooj yim mixtures yuav shape coextrusion daim ntawv thov rau yav tom ntej.
