CMC (Carboxymethyl cellulose) hauv kev lag luam papermaking yog qhov tseem ceeb uas siv los txhim kho cov ntawv zoo thiab ua tau zoo. CMC yog dej-soluble polymer compound nrog zoo viscosity hloov zog thiab ua lub luag haujlwm tseem ceeb hauv kev sau.
1. Cov khoom yooj yim ntawm CMC
CMC yog qhov ua kom muaj txiaj ntsig ntawm cellulose, uas yog ua los ntawm recachoyl ib feem ntawm cellulose nrog chloroacetic acid. Nws muaj cov dej zoo heev solubility thiab voscosity hloov muaj peev xwm. CMC ua qauv ua qauv zoo tom qab dissolving nyob rau hauv dej, uas ua rau nws muaj txiaj ntsig heev hauv ntau cov ntawv thov.
2. Lub luag haujlwm ntawm CMC hauv kev lag luam papermaking
Nyob rau hauv cov txheej txheem papermaking, cmc yog tsuas yog siv los ua cov nplaum, cov tuab dua thiab stabilizer. Nws cov haujlwm muaj xws li:
2.1 Txhim kho lub zog ntawm cov ntawv
CMC muaj peev xwm ua tau zoo pab txhawb kom cov cohesion thiab nro ntawm daim ntawv, thiab txhim kho cov kua muag tsis kam thiab muab tais ceev ua haujlwm. Nws cov kev ua tshuab ntawm kev ua yog los ua ntawv nruj thiab ntau ruaj los ntawm kev txhim kho qhov kev sib txuas ntawm pulp fibers.
2.2 Txhim kho qhov ci thiab nto smoothness ntawm daim ntawv
Ntxiv CMC tuaj yeem txhim kho qhov chaw zoo ntawm daim ntawv thiab ua kom cov ntawv smoother. Nws tuaj yeem sau qhov khoob ntawm cov ntawv thiab txo cov roughness ntawm cov ntawv sib dhos, yog li kev txhim kho cov kab lus thiab luam tawm kom raug cov ntawv.
2.3 Tswj lub viscosity ntawm pulp
Thaum lub sij hawm lub papermaking txheej, cmc tuaj yeem tswj lub viscosity ntawm porposity thiab kom cov kev ua kom zoo nkauj thiab kev sib dhos. Qhov tsim nyog viscosity pab rau tusorsy faib lub ntsws, txo cov khoom tsis xws luag, thiab txhim kho ntau lawm.
2.4 Txhim kho cov dej khaws cia ntawm sis ntshav
CMC muaj lub peev xwm ua tau dej zoo thiab tuaj yeem txo cov dej poob ntawm pulp thaum lub sijhawm moulding txheej txheem. Qhov no tuaj yeem txo cov ntawv pov tseg thiab cov teeb meem deformation uas tshwm sim thaum lub sijhawm ua kom qhuav, yog li kev txhim kho qhov ruaj khov ntawm daim ntawv.
3. Kho kom haum ntawm cmc viscosity
Lub viscosity ntawm CMC yog qhov tseem ceeb ntsuas rau nws cov nyhuv hauv cov txheej txheem papermakaking. Raws li kev sib txawv ntau ntxiv, lub viscosity ntawm cmc tuaj yeem hloov kho los ntawm kev kho nws cov kev xav thiab hnyav. Tshwj xeeb:
3.1 nyhuv ntawm molecular hnyav
Qhov hnyav molecular ntawm CMC muaj cov nyhuv ncaj qha rau nws viscosity. CMC nrog lub zog loj loj dua feem ntau muaj visccosity ntau dua, yog li cov molecular hnyav cmc yog siv hauv cov ntawv thov uas yuav tsum tau viscosity siab. Tsawg molecular hnyav cmc yog haum rau qee zaus uas xav tau qis viscosity.
3.2 Cov nyhuv ntawm kev daws teeb meem
Qhov kev daws teeb meem ntawm cmc tseem yog qhov tseem ceeb cuam tshuam rau viscosity. Feem ntau hais lus, qhov siab dua ntawm cov kev daws cmc, qhov ntau dua nws viscosity. Yog li ntawd, hauv cov kev daws teeb meem ntawm cmc yuav tsum tau hloov kho raws li cov kev cai kom ua tiav qhov xav tau qib viscosity.
4. Kev ceev faj rau kev siv CMC
Thaum siv CMC nyob rau hauv cov txheej txheem papermakakaking, cov ntsiab lus hauv qab no yuav tsum tau sau tseg:
4.1 Piv tseeb
Tus nqi ntawm CMC ntxiv yuav tsum tau hloov kho raws li cov kev xav tau ntawm daim ntawv. Yog tias muaj ntau ntxiv, nws yuav ua rau pitp viscosity kom siab dhau thiab cuam tshuam rau cov txheej txheem ntau lawm; Yog tias tsis txaus, cov nyhuv cia siab yuav tsis tiav.
4.2 Cov Txheej Txheem Tswj Kev Tiv Thaiv
CMC yuav tsum tau yaj nyob rau hauv dej txias kom tsis txhob muaj kev tsis txaus siab thaum cua sov. Cov txheej txheem sib cais yuav tsum tau ua kom ntseeg tau tias CMC yog yaj tag thiab zam dhau agglomeration.
4.3 cov nyhuv ntawm tus nqi pH
Kev ua yeeb yam ntawm CMC yuav cuam tshuam los ntawm PH tus nqi. Hauv ntawv ntau lawm, ib feem ntawm PHQU yuav tsum tau tswj kom ntseeg tau tias qhov zoo tshaj plaws ntawm CMC.
CMC ua lub luag haujlwm tseem ceeb hauv kev lag luam papermaking, thiab nws cov viscososos hloov muaj peev xwm ncaj qha cuam tshuam rau cov ntawv zoo thiab kev ua tau zoo ntawm daim ntawv. Los ntawm kev xaiv kom raug thiab siv CMC, lub zog, ci, du thiab tsim kev ua haujlwm zoo thiab ua tau zoo dua. Txawm li cas los xij, nyob rau hauv daim ntawv thov tiag tiag, cov confentration thiab viscosity ntawm cms yuav tsum tau hloov kho raws li kev tsim khoom kom ntseeg tau tias nws tau zoo tshaj plaws.
Lub sij hawm Post: Lub Yim-13-2024