Hauv cov ntawv thov plastics, titanium dioxide yog cov xim nrov dua vim nws muab qhov zoo tshaj plaws tawg ntawm cov xim qis. Ntxiv nrog rau cov khoom siv kho qhov muag, lwm yam khoom tseem ceeb kuj tseem tuaj yeem txiav txim siab qib ntawm titanium dioxide rau lub hom phiaj tshwj xeeb. Qee yam khoom tseem ceeb tau tham hauv tshooj no. Cov khoom siv kho qhov muag (Optical) Thaum xaiv siv titanium dioxide, nws yog ib qho tsim nyog yuav tsum xav txog cov khoom siv kho qhov muag xws li kev hloov kho, lub zog tinting, xim tom qab thiab xim. Kev hloov pauv thiab tinting lub zog ntawm cov xim dawb qhia tau hais tias nws cuam tshuam lub teeb zoo li cas, qhov kev hloov pauv qhia tau hais tias lub peev xwm ntawm cov xim dawb siv cov txheej txheem yas kom opaque, thiab lub zog tinting qhia cov xim dawb thiab ci ntsa iab uas cov xim dawb muab rau. tinted yas system (brightness).
Vim tias nws yooj yim dua los ntsuas, tint siv feem ntau yog siv los nthuav qhia lub teeb tawg ua haujlwm ntawm cov xim dawb. Txhawm rau ntsuas qhov txheeb ze tinting zog, {{0}}.008 grams ntawm cov pa roj carbon dub ntxiv rau txhua gram ntawm titanium dioxide qauv, thiab cov neeg siv txoj cai siv cov xim dub sib xyaw ua ke (Master batch) kom tawg. nyob rau hauv cov yas, thiab cov yas grey uas ua los ntawm nws yog ua los rau hauv cov khoom sib xws. , opaque yas ntawv los yog molded chips. Qhov chaw nres nkoj titanium dioxide kuaj nrog lub teeb pom kev zoo tshaj plaws muab lub teeb grey thiab lub teeb pom kev zoo tshaj plaws. Lub hauv paus xim (UNDERTONE) ntawm titanium dioxide muaj kev cuam tshuam rau cov xim ntawm cov xim. Lub hauv paus xim txawv nyob ntawm seb qhov luaj li cas ntawm titanium dioxide, thiab nws tsis tuaj yeem ntsuas los ntawm cov tsos ntawm cov hmoov qhuav qhuav los yog cov yas dawb. Undertones feem ntau piav raws li qhov cuam tshuam ntawm xiav rau xim liab hauv grey tint raws li ntsuas los ntawm peb lim colorimeter. (pem xim=xiav reflection/liab reflection). Tus neeg soj ntsuam tau kawm tuaj yeem pom qhov qis ntawm 0.01 qhov sib txawv ntawm cov xim grey. Hauv qee daim ntawv thov pob tshab, qhov pom ntawm cov xim kis tau yog qhov tseem ceeb. Piv nrog rau cov xim dawb ntawm qib ntawm titanium dioxide nrog cov dej me me thiab cov khoom zoo sib xws nrog cov dej siab ntawm titanium dioxide, cov pob tshab zoo li daj, yog li nws yog siv rau hauv kev tsim khoom ntawm qee yam khoom, xws li coarse yas fwj. , teeb ntxoov ntxoo, thiab lwm yam. titanium dioxide qib nrog lub nruab nrab lossis daj keeb kwm yav dhau yog nrov dua. Thaum cov xim sib txuam, kev siv titanium dioxide nrog cov xim xim yog qhov tseem ceeb rau kev sib txuam xim. Lub hauv paus xim sib txawv no nyuaj rau kev kho nrog cov xim ntawm cov xim. Thaum titanium dioxide siv ib leeg nyob rau hauv lub cev tsis muaj xim tsis muaj xim, nws cov xim tsis muaj dab tsi ua nrog cov tsos ntawm titanium dioxide, thiab tsis muaj dab tsi ua rau cov xim tom qab. Feem ntau ntawm cov qib titanium dioxide siv yuav tsis muaj qhov hloov pauv ntawm cov xim, txawm li cas los xij, cov hauv qab no tuaj yeem ua rau cov xim tsis zoo: kev sib kis (kev sib kis) titanium dioxide thiab resin los yog cov khoom siv ntxiv (cov khoom siv ntxiv) cov tshuaj tiv thaiv tshav kub stability (heat stability) Xim thiab undertone. tej zaum tsis meej pem. Nws yuav tsum raug sau tseg tias ib qho ntawm cov xwm txheej saum toj no tuaj yeem ua rau xim daj ntawm titanium dioxide nrog xiav keeb kwm yav dhau. Nws tsis yog qhov txawv txav rau titanium dioxide qib sib txawv ntawm qhov sib txawv kom muaj xim tib yam. Brightness (=Green Performance index) thiab yellowness Performance index [=100×(liab reflection-blue reflection)/green reflection] yog cov lus uas siv los piav txog cov xim ntawm cov yas dawb.