Cov ntsiab lus tseem ceeb
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm ib qho - ntsia hlau extruder tuaj yeem nkag siab yooj yim raws li cov txheej txheem uas cov ntsia hlau tig tsis tu ncua conveys, compresses, melts, mixes, homogenizes, thiab thaum kawg extrudes yas yaj ntawm tus nqi tas li nyob rau hauv ib lub thoob rhuab. Nws lub hauv paus yog nyob rau hauv kev sib koom ua ke ntawm cov ntsia hlau thiab lub thoob.
Cov Cheebtsam
1.Screw: Cov khoom tseem ceeb, feem ntau muab faib rau hauv seem pub, seem compression (melting section), thiab homogenizing seem (metering seem). Nws cov geometric tsis (inch, ntev - mus rau - txoj kab uas hla piv, channel qhov tob, helix lub kaum sab xis, thiab lwm yam) txiav txim siab lub tshuab ua haujlwm.
2.Barrel: Lub tog raj kheej hlau uas kaw lub hau ntswj, nruab nrog cov cua sov sab hauv thiab cov cua txias kom muab cua sov rau cov khoom siv thiab xyuas kom meej qhov kub thiab txias.
3.Lub taub hau tuag: Mounted ntawm qhov kawg ntawm lub extruder, nws imparts tus ntoo khaub lig zaum kawg -sectional shape rau cov khoom extruded (xws li, kav, nplooj ntawv, films, profiles, thiab lwm yam).
Cov txheej txheem nthuav dav ntawm Txoj Cai Ua Haujlwm
Kauj Ruam 1: Cov Khoom Muag Khoom Muag (Cov Khoom Noj Khoom Noj)
Qhov chaw: Ib feem ntawm cov ntsia hlau ze ntawm lub hopper.
Muaj nuj nqi: Kom ruaj khov thiab tsis tu ncua xa cov khoom xoob (lossis hmoov) rau pem hauv ntej.
Txoj Cai:
Cov khoom ntim cov ntsia hlau channel thiab raug ntes los ntawm cov ntsia hlau tig.
Txij li qhov kev sib txhuam ntawm cov khoom siv thiab cov ntsia hlau yog tsawg dua qhov kev sib txhuam ntawm cov khoom siv thiab cov phab ntsa sab hauv ntawm lub thoob, raws li cov ntsia hlau tig, cov khoom yog "dragged" rau pem hauv ntej raws phab ntsa sab hauv ntawm lub thoob, zoo li cov txiv ntoo.
Cov channel qhov tob hauv ntu no feem ntau yog qhov tob tshaj plaws, nrog rau qhov ntim tas li. Nws tsuas yog ua lub cev conveying; cov khoom tseem tshuav feem ntau, nrog rau qhov kub thiab txias.
Theem 2: Melting Section (Compression Section)
Qhov chaw: Qhov nruab nrab ntawm cov ntsia hlau.
Muaj nuj nqi: Kom compact, soften, thiab tag nrho yaj cov khoom mus rau hauv lub viscous flow xeev, thaum tshem tawm entrained cua.
Txoj Cai:
Cov ntsia hlau channel qhov tob txo qis los ntawm qhov tob mus rau ntiav, tsim kom muaj qhov sib piv compression. Cov khoom raug quab yuam compressed, nws qhov ceev nce, thiab interparticle voids raug tshem tawm.
Raws li kev sib xyaw ua ke ntawm cov cua sov sab nraud (muab los ntawm lub thoob) thiab sab hauv kev sib txhuam cua sov (tsim los ntawm shear ntawm cov khoom, ntsia hlau, thiab chim), cov khoom kub nce mus rau qhov kub thiab txias.
Melting pib los ntawm cov khoom nyob ze ntawm lub puab phab ntsa ntawm lub thoob, tsim ib tug yaj zaj duab xis, uas yog scraped tawm los ntawm cov ntsia hlau flights thiab sau rau hauv cov ntsia hlau channel los ua ib tug yaj pas dej ua ke. Lub txaj khoom (cov khoom siv tsis tau yaj) yog maj mam nyem kom txog thaum nws ploj mus, nws thiaj li hloov mus rau hauv yaj.
Qhov no yog theem tseem ceeb rau kev ua tiav cov theem hloov ntawm cov khoom siv.
Theem 3: Melt Conveying Section (Homogenizing Section / Metering Section)
Qhov chaw: Lub frontmost feem ntawm cov ntsia hlau, ze ntawm lub taub hau tuag.
Muaj nuj nqi: Ntxiv homogenize, sib tov, thiab pressurize cov khoom melted, thiab tsim kom muaj ib tug ruaj khov siab extrude nws los ntawm lub taub hau tuag ntawm qhov kub thiab txias, qhov tsis tu ncua, thiab qhov siab tsis tu ncua.
Txoj Cai:
Qhov tob channel hauv seem no yog qhov qis tshaj plaws thiab tsis tu ncua, ua rau muaj zog shearing nyhuv ntawm cov yaj.
Kev hnyav shearing txhawb kev sib xyaw ntawm cov khoom sib xyaw (piv txwv li, pigments, additives) thiab kub homogeneity.
Lub twj tso kua mis siab tsim los ntawm kev sib hloov ntawm cov ntsia hlau yog siv los kov yeej lub siab tsis kam ntawm lub taub hau tuag, ua kom ruaj khov thiab nruam yaj ntws los ntawm kev tuag.
Cov zis thiab ruaj khov ntawm extruder feem ntau txiav txim siab los ntawm ntu no.
Nws cov txheej txheem ua haujlwm yooj yim zoo ib yam li cov nqaij grinder lossis pasta txiag peb siv nyob rau hauv lub neej txhua hnub: cov khoom yog pub rau hauv, thawb rau pem hauv ntej los ntawm kev tig ntsia hlau, thiab nyob rau hauv qhov kev txiav txim ntawm compression thiab sab nraud cua sov, nws hloov los ntawm ib tug khoom lub xeev mus rau ib tug uniform viscous kua, uas yog tsis tu ncua extruded los ntawm ib tug tuag lub taub hau ntawm ib tug tshwj xeeb cov duab.