1. Kev txiav txim siab qhov ruaj khov thiab sib xws ntawm cov yeeb nkab qhov ntev
Kev hloov pauv ntawm cov khoom noj ua rau cov phab ntsa tuab tsis sib xws: Yog tias lub tshuab pub khoom ua haujlwm tsis sib xws lossis qhov sib txawv - zaus tsav lub cev muaj cov lus teb qeeb, cov khoom siv nkag mus rau hauv extruder yuav txawv. Cov kev hloov pauv no tau cuam tshuam ncaj qha rau hauv cov khoom kawg, uas ua rau cov phab ntsa thickness kam rau siab thiab axial phab ntsa thickness variations. Rau cov kav dej siab nrog cov lus tshwj xeeb nruj, qhov no tuaj yeem ua rau lub siab txo qis -cov kabmob muaj peev xwm thiab txawm tias tawg thaum siv.
Kev cuam tshuam rau qhov ruaj khov-ntev txiav qhov tseeb: Rau cov kab ntau lawm nruab nrog ntsuas - suav ruaj- ntev txiav tshuab, kev hloov pauv ntawm tus nqi pub tuaj yeem ua rau tsis ruaj khov extrusion ceev, ua rau muaj kev ua yuam kev hauv kev txiav ntev thiab nce tus nqi seem.
2. Cov yam ntxwv cuam tshuam rau cov cuab yeej cuab tam ntawm cov khoom siv yeeb nkab
Kev ziab kom qhuav txiav txim siab qhov tsis xws luag: PP resin yog hygroscopic. Yog hais tias lub tshuab ziab khaub ncaws hauv lub tshuab pub mis (xws li lub tshuab ziab khaub ncaws) tsis zoo, cov khoom siv raw khoom yuav nkag mus rau qhov siab - qhov kub thiab txias cheeb tsam nrog rau cov ntsia hlau. Hydrolysis ua rau cov saw molecular tawg, thiab vim dej vapor tsis tuaj yeem khiav tawm, nws thaum kawg ua npuas lossis nyiaj streaks sab hauv lossis ntawm cov yeeb nkab. Cov kab mob microscopic no ua rau cov yeeb nkab tsis muaj zog tensile, cuam tshuam tsis kam, thiab ntev -lub sij hawm tsis kam mus rau qhov zoo li qub. Lawv ua raws li cov ntsiab lus kev ntxhov siab, ua rau ua rau ntxov ntxov rupture ntawm cov yeeb nkab thaum raug kev nyuaj siab.
Kev sib xyaw ua ke txiav txim siab qhov ua tau zoo sib xws: Ntau yam PP yeeb nkab formulations muaj ntau yam additives xws li xim masterbatches, antistatic agents, thiab UV stabilizers, los yog iav fiber ntau - cov ntaub ntawv ntxiv. Yog tias cov khoom sib xyaw ntawm lub feeder ua haujlwm tsis zoo, cov khoom siv ntxiv lossis cov txheej txheem txhawb nqa tsis tuaj yeem sib cais hauv cov matrix, ua rau muaj kev hloov pauv hauv cheeb tsam hauv cov yeeb nkab. Piv txwv li, cov cheeb tsam uas cov iav fibers sib sau ua ke yog qhov ua rau ntawm qhov chaw roughness thiab kev ntxhov siab, thaum thaj chaw uas tsis muaj iav fibers raug kev txom nyem los ntawm lub zog tsis txaus.
3. Cov yam ntxwv cuam tshuam rau qhov tshwm sim zoo ntawm cov khoom siv yeeb nkab
Tsim cov Pleev Xim Dub thiab Crystalline Spots: Yog tias muaj cov tawv nqaij - rau- ntxuav qhov chaw tuag (feem ntau hu ua "cov khoom tsim cov khoom siv") nyob rau hauv qhov chaw pub mis, cov khoom PP uas nyob twj ywm rau lub sij hawm ntev yuav rov ua kom sov ntawm qhov kub thiab txias, ua rau thermal- cov khoom tsim cov khoom siv hauv cov khoom noj khoom haus" thiab cov khoom siv PP uas nyob twj ywm rau lub sij hawm ntev yuav rov ua kom sov ntawm qhov kub thiab txias, ua rau thermal- oxidative degradue} cov pa roj carbon monoxide residation thiab degradation. Cov khoom degradation no tau nqa tawm ib ntus los ntawm cov khoom tshiab thiab sib xyaw rau hauv cov yaj, ua rau cov pob dub, cov khoom tawg, lossis cov kab daj daj ntawm cov yeeb nkab nto, uas ua rau cov khoom zoo li qub.
Ua rau Nto Roughness: Cov khoom noj tsis sib xws lossis kev ziab tsis tiav tsis tsuas yog ua npuas tab sis kuj ua rau cov dej ntws tsis zoo. Raws li qhov tshwm sim, thaum cov yeeb nkab hla qhov tuag thiab lub tes tsho tiav, qhov saum npoo tsis tuaj yeem rov ua dua qhov tuag qhov smoothness, ua rau muaj qhov ntxhib, npub - saib cov khoom kawg.
4. Kev cuam tshuam rau kev ruaj khov thiab kev siv hluav taws xob
"Bridging" ua rau muaj kev cuam tshuam rau cov khoom noj: Yog tias cov khoom noj khoom haus tsis zoo, los yog cov khoom siv raw (tshwj xeeb tshaj yog cov khoom siv rov ua dua tshiab) muaj qhov tsis zoo, "bridging" (qhov twg cov khoom ntim hauv lub hopper tsis poob) tuaj yeem tshwm sim tau yooj yim, ua rau muaj kev cuam tshuam txog kev pub noj tam sim ntawd. Qhov no ua rau muaj kev poob qis hauv siab nyob rau hauv lub extruder, uas ua rau cov yeeb nkab seem nrog cov khoom tsis xws luag thiab tsis zoo plasticization; Nyob rau hauv cov xwm txheej hnyav, nws tseem yuav tsum tau kaw kom huv si tuag.
Kev noj zaub mov tsis ruaj khov ua rau muaj kev siv zog ntau ntxiv: Cov ntsia hlau yuav tsum kov yeej qhov kev tiv thaiv ntxiv los ntawm kev hloov pauv ntawm cov khoom siv, uas ua rau muaj kev hloov pauv tsis tu ncua ntawm lub cev muaj zog tam sim no. Qhov no tsis yog tsuas yog ua kom lub zog noj xwb tab sis kuj ua kom nrawm nrawm ntawm cov ntsia hlau thiab lub thoob.