(29) Ua rau Brittleness ntawm Cov Khoom Siv Yas Txhaj Molding Txheej Txheem Tsis Zoo Los Ntawm Txhais Tes

Friability
Lub brittleness ntawm cov khoom feem ntau tshwm sim los ntawm kev ntxhov siab sab hauv. Muaj ntau yam laj thawj rau cov khoom brittleness, feem ntau suav nrog:
Khoom siv
(1) Muaj * cov ces kaum lossis teeb meem hauv lub thoob, uas tuaj yeem yooj yim txhawb kev degradation ntawm cov khoom molten.
(2) Lub peev xwm plasticizing ntawm lub tshuab yog me heev, thiab cov yas tsis yog cov yas hauv lub tshuab chim; Lub peev xwm plasticizing ntawm lub tshuab yog loj heev, thiab cov yas raug cua sov thiab shear txiav txim nyob rau hauv lub tog raj kheej ntev dhau lawm. Cov yas yog yooj yim rau kev laus, ua rau cov khoom nkig.
(3) Lub tshuab ejection yog inclined los yog tsis sib npaug, thiab qhov chaw hla ntawm lub ejector ncej yog me me los yog tsis raug.
II. Pwm
(1) Yog tias lub rooj vag me dhau, xav txog kev kho lub rooj vag loj lossis ntxiv lub rooj vag pab.
(2) Yog hais tias lub shunt channel me dhau los yog teeb tsa tsis raug, sim ua kom nws nyob rau hauv qhov sib npaug thiab tsim nyog lossis nce qhov loj ntawm shunt channel.
(3) Cov qauv pwm tsis zoo ua rau lub voj voog txhaj tshuaj molding txawv txav.
III. Txheej txheem
(1) Qhov kub ntawm lub thoob thiab lub nozzle yog qis heev, kho nws siab dua. Yog hais tias cov khoom yog degradation, qhov kub ntawm lub chim thiab nozzle yuav tsum tau nce.
(2) Txo lub nraub qaum thiab kev sib hloov ceev ntawm cov ntsia hlau ua ntej molding kom me ntsis loosen cov khoom thiab txo cov degradation ntawm cov yas vim shear overheating.
(3) Cov pwm kub siab dhau lawm, ua rau nws nyuaj rau demould; Cov pwm kub qis dhau lawm, cov yas txias ua ntej, cov pob qij txha fusion tsis zoo, thiab nws yooj yim rau tawg, tshwj xeeb tshaj yog rau cov yas siab melting point xws li polycarbonate.
(4) Cov kab noj hniav yuav tsum muaj lub kaum sab xis tso tawm tsim nyog. Thaum cov tub ntxhais yog qhov nyuaj rau demould, nws yog ib qho tsim nyog los ua kom cov kab noj hniav kub thiab ua kom lub sij hawm txias; Thaum cov pwm kab noj hniav tsis yooj yim rau kev tshem tawm, txo qis pwm kab noj hniav kub thiab ncua lub sijhawm txias.
(5) Kev siv cov hlau ntxig kom tsawg, thiab cov yas nkig xws li polystyrene uas muaj qhov kub thiab txias txias yuav tsum tsis txhob siv rau kev txhaj tshuaj molding.
Plaub yam ntawm cov khoom siv raw
(1) Thaum cov khoom siv raw yog tov nrog lwm yam impurities lossis doped nrog cov kuab tshuaj tsis tsim nyog lossis ntau dhau los yog lwm yam khoom ntxiv.
(2) Qee cov khoom siv yas, xws li ABS, tuaj yeem ua rau cov tshuaj tiv thaiv catalytic tawg nrog dej vapor thaum rhuab nyob rau hauv cov huab cua ntub dej, ua rau muaj kev cuam tshuam loj rau qhov chaw.
(3) Ntau zaus ntawm cov yas rov ua dua tshiab, cov khoom siv rov ua dua tshiab ntau dhau, lossis lub sijhawm cua sov hauv lub thoob tuaj yeem txhawb kev tawg ntawm cov khoom ua haujlwm.
(4) Qhov zoo ntawm cov yas nws tus kheej yog qhov tsis zoo, xws li cov khoom hnyav molecular faib thiab ntau cov khoom siv nrog cov qauv tsis sib xws xws li cov saw hlau molecular; Los yog kis tau los ntawm lwm yam yas, cov khoom siv tsis zoo, plua plav, impurities, thiab lwm yam kuj ua rau embrittlement.
V. Khoom Tsim
(1) Cov khoom lag luam muaj cov kaum ntse ntse, qhov tsis zoo, lossis qhov chaw nrog cov tuab tuab sib txawv uas ua rau muaj kev ntxhov siab tawg.
(2) Cov khoom tsim yog nyias dhau los yog muaj ntau hollows.