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Xaiv cov khoom polyvinyl alcohol (PVA) xws li cov yeeb yaj kiab, cov khoom txuas, cov txheej txheem, thiab lwm yam khoom polyvinyl alcohol, nkag siab txog cov nyhav uas yuav pab koj hauv kev ua kom raug xaiv rau daim ntawv thov yog qhov tseem ceeb heev. Polyvinyl alcohol yog siv dav hauv ntau hom lag luam, los ntawm cov ntaub ntawv mus rau kev tsim kho, nws yog ib qho polymer synthetic uas muaj peev xwm ntau. Tsab xov xwm no yuav qhia txog cov ntsiab lus tseem ceeb uas yuav tsum tau xav txog kom koj tsis txhob ntsib teeb meem thaum koj ua koj cov kev xaiv raws li koj cov kev xav tau.
Qhov tseem ceeb thawj zaug uas yuav tsum tau saib xyuas yog xyuas qhov purity thiab qhov qib hydrolysis ntawm PVA khoom. Qhov qib hydrolysis txiav txim siab qhov peev xwm ntawm polymer los tsim ib qho film thiab nws solubility, uas yog qhov tseem ceeb heev li cas txog kev siv adhesive thiab coating. Piv txwv, Hydrolysis PVA nrog qib siab feem ntau dissolves hauv dej vim nws muaj qib siab, yog li ua rau nws muaj nuj nqis hauv cov ntawv thov uas xav tau solubility hauv dej. Rau lwm sab, cov qib hydrolysis qis yuav tsum tau xaiv hauv qhov no rau cov ntawv thov uas xav tau qib qis ntawm dej kev sib raug zoo.
Qhov thib ob tseem ceeb yog yuav tsum saib xyuas polyvinyl alcohol cov molecular hnyav. Cov molecular hnyav yuav muaj kev cuam tshuam ncaj qha rau viscosity thiab cov yam ntxwv mechnical ntawm cov khoom tiav. PVA nrog molecular hnyav siab muaj zog thiab ruaj khov; li ntawd, ua rau nws haum rau kev siv hauv cov ntawv thov nyuaj xws li cov khoom siv hauv tsev. Rau lwm sab, cov qauv molecular hnyav qis yuav raug suav tias yog qhov tsim nyog dua hauv cov xwm txheej uas xav tau kev kho yooj yim thiab cov tshuaj daws viscosity qis.
Dab tsi yog lwm qhov ntawm koj PVA khoom muag cov ntsiab lus? Nws yog qhov kev siv ntawm lub hom PVA khoom. Tsuas yog, muaj cov qauv tshwj xeeb uas yog kev lag luam tshwj xeeb thiab thaum paub meej, yuav pab koj nrog qhov xaiv. Raws li piv txwv, PVA tau siv ua sizing agent hauv cov ntaub ntawv txheej txheem lag luam thaum ua binder hauv cov ntawv ua lag luam. Kev paub txog cov requirments ntawm koj daim ntawv thov kom meej yuav significantly txo tau cov kev xaiv uas muaj, kom qhov kev ua tiav kawg tau txais kev lees paub.
Muaj kuj yog qhov teeb meem ntawm lwm cov khoom uas tsis tuaj yeem tsis quav ntsej. Thaum siv PVA cov khoom, nws yog qhov tseem ceeb heev kom paub txog txoj haujlwm ntawm PVA hauv lwm cov khoom ntawm cov qauv, yog tias muaj. Qee qhov ntawm cov ntsiab lus no suav nrog pH, kub, thiab lwm cov solvents lossis additives. Kev sib haum xeeb yuav tshem tawm cov teeb meem xws li kev faib tawm lossis kev poob qis ntawm cov txheej txheem, uas ua rau qhov khoom kawg poob.
Thaum kawg, nws yog qhov tseem ceeb kom yuav PVA cov khoom tsuas yog los ntawm cov neeg muab khoom uas muaj koob npe. PVA cov khoom zoo thiab cov yam ntxwv yog nyob ntawm tus tsim khoom. Nws yog ib qho zoo tswv yim kom ua ntau qhov kev tshawb fawb thiab txawm tias thov qee qhov qauv los kuaj cov khoom ua ntej txiav txim siab yuav ib qho khoom ntau. Tsis tas li, tsuas yog cov neeg muab khoom uas muaj koob npe muab kev pab cuam thev naus laus zis kom PVA tuaj yeem siv tau zoo thiab zoo rau qhov kev thov.
Txog rau qhov xaus, qhov kev xaiv ntawm qhov twg paraffin, polyvinyl alcohol lossis saran 'film yog qhov zoo tshaj plaws rau ib qho kev thov tshwj xeeb yog ib qho kev txiav txim uas xav tau ib qho kev tshuaj xyuas dav dav ntawm qhov ntau ntawm cov ntsiab lus xws li kev thov, kev haum, warranty thiab kawg yog qhov kev ntseeg tau ntawm tus neeg muab khoom lossis tus tsim khoom. PVA's scope yog nce ntxiv mus rau ntau qhov chaw ua haujlwm yog li ntawd nws yog qhov tseem ceeb kom koj nco ntsoov cov ntsiab lus tseem ceeb saum toj no uas yuav tso cai rau koj ua cov kev xaiv uas yuav txhim kho koj cov khoom ua haujlwm thaum tseem ua tiav cov kev xav tau ntawm kev lag luam. Qhov teeb meem ntawm green economics zoo li yog qhov kev taw qhia uas qhov ceev thiab txoj kev uas cov khoom xws li polyvinyl alcohol raug tsim yog qhov tseem ceeb hauv kev ntseeg tau tias tsuas yog cov zoo tshaj plaws ntawm PVA's yog xaiv. Kev tsom mus rau cov ntsiab lus no yuav tso cai rau koj siv cov khoom tshwj xeeb ntawm polyvinyl alcohol rau koj qhov zoo dua hauv koj cov kev thov thiab lwm yam txheej txheem.