CMC (carboxymethyl cellulose) hauv kev lag luam papermaking yog ib qho tseem ceeb additive siv los txhim kho cov ntawv zoo thiab kev ua tau zoo. CMC yog cov dej-soluble polymer compound nrog zoo viscosity hloov khoom thiab plays lub luag haujlwm tseem ceeb hauv papermaking.
1. Cov yam ntxwv ntawm CMC
CMC yog ib qho derivative ntawm cellulose, uas yog tsim los ntawm reacting hydroxyl ib feem ntawm cellulose nrog chloroacetic acid. Nws muaj cov dej solubility zoo heev thiab muaj peev xwm hloov kho viscosity. CMC tsim cov kua dej khov tom qab yaj hauv dej, uas ua rau nws muaj txiaj ntsig zoo hauv ntau yam kev lag luam.
2. Lub luag haujlwm ntawm CMC hauv kev lag luam papermaking
Hauv cov txheej txheem papermaking, CMC feem ntau yog siv los ua cov nplaum, thickener thiab stabilizer. Nws cov haujlwm muaj xws li:
2.1 Txhim kho lub zog ntawm daim ntawv
CMC tuaj yeem txhim kho kev sib koom ua ke thiab nro ntawm daim ntawv, thiab txhim kho lub kua muag tsis kam thiab folding tsis kam ntawm daim ntawv. Nws cov txheej txheem ntawm kev ua haujlwm yog ua kom cov ntawv tawv dua thiab ruaj khov dua los ntawm kev txhim kho lub zog sib txuas ntawm cov pulp fibers.
2.2 Txhim kho qhov gloss thiab nto smoothness ntawm daim ntawv
Ntxiv CMC tuaj yeem txhim kho qhov zoo ntawm daim ntawv thiab ua rau saum npoo ntawm daim ntawv smoother. Nws tuaj yeem ua tiav qhov khoob ntawm daim ntawv thiab txo qhov roughness ntawm daim ntawv, yog li txhim kho cov gloss thiab luam ntawv adaptability ntawm daim ntawv.
2.3 Tswj lub viscosity ntawm pulp
Thaum lub sij hawm ua cov txheej txheem papermaking, CMC tuaj yeem tswj tau cov viscosity ntawm cov ntaub so ntswg thiab xyuas kom lub fluidity thiab uniformity ntawm pulp. Tsim nyog viscosity pab kom sib npaug ntawm cov ntaub so ntswg, txo cov ntawv tsis xws luag, thiab txhim kho kev tsim khoom.
2.4 Txhim kho cov dej khaws cia ntawm cov pulp
CMC muaj peev xwm tuav tau dej zoo thiab tuaj yeem txo cov dej poob ntawm cov tawv nqaij thaum lub sij hawm molding txheej txheem. Qhov no tuaj yeem txo qhov shrinkage ntawm daim ntawv thiab cov teeb meem deformation uas tshwm sim thaum lub sij hawm ziab, yog li txhim kho cov ntawv ruaj khov.
3. Kev hloov ntawm CMC viscosity
Lub viscosity ntawm CMC yog ib qho tseem ceeb parameter rau nws cov nyhuv nyob rau hauv cov txheej txheem papermaking. Raws li kev tsim khoom sib txawv, viscosity ntawm CMC tuaj yeem hloov kho los ntawm kev kho nws cov concentration thiab molecular hnyav. Tshwj xeeb:
3.1 Cov nyhuv ntawm molecular hnyav
Qhov hnyav molecular ntawm CMC muaj qhov cuam tshuam ncaj qha rau nws cov viscosity. CMC nrog qhov hnyav dua molecular feem ntau muaj viscosity ntau dua, yog li qhov hnyav molecular CMC yog siv rau hauv cov ntawv thov uas yuav tsum muaj viscosity siab. Tsawg molecular hnyav CMC yog haum rau lub sijhawm uas yuav tsum tau qis viscosity.
3.2 Cov nyhuv ntawm cov tshuaj concentration
Qhov concentration ntawm CMC cov tshuaj kuj yog ib qho tseem ceeb uas cuam tshuam rau viscosity. Feem ntau hais lus, qhov siab dua qhov concentration ntawm CMC cov tshuaj, qhov ntau dua nws cov viscosity. Yog li ntawd, hauv kev tsim khoom tiag tiag, kev daws teeb meem ntawm CMC yuav tsum tau hloov kho raws li cov kev cai tshwj xeeb kom ua tiav qib viscosity uas yuav tsum tau ua.
4. Kev ceev faj rau kev siv CMC
Thaum siv CMC hauv cov txheej txheem papermaking, cov ntsiab lus hauv qab no yuav tsum tau sau tseg:
4.1 Qhov tseeb piv
Tus nqi ntawm CMC ntxiv yuav tsum raug kho raws li cov cai tshwj xeeb ntawm daim ntawv. Yog tias ntxiv ntau dhau lawm, nws yuav ua rau cov ntaub ntawv viscosity siab dhau thiab cuam tshuam rau cov txheej txheem ntau lawm; yog tias tsis txaus, qhov kev xav tau yuav tsis ua tiav.
4.2 Kev tswj cov txheej txheem tawg
CMC yuav tsum tau yaj hauv dej txias kom tsis txhob degradation thaum cua sov. Cov txheej txheem dissolution yuav tsum tau nplawm tag nrho kom ntseeg tau tias CMC yog yaj tag thiab tsis txhob agglomeration.
4.3 Qhov cuam tshuam ntawm pH tus nqi
Kev ua haujlwm ntawm CMC yuav raug cuam tshuam los ntawm tus nqi pH. Hauv kev tsim cov ntawv, qhov tsim nyog pH yuav tsum tau khaws cia kom ntseeg tau tias qhov zoo tshaj plaws ntawm CMC.
CMC plays lub luag haujlwm tseem ceeb hauv kev lag luam papermaking, thiab nws qhov kev hloov kho viscosity ncaj qha cuam tshuam rau cov ntawv zoo thiab kev ua haujlwm ntawm daim ntawv. Los ntawm kev xaiv thiab siv CMC kom zoo, lub zog, gloss, smoothness thiab ntau lawm efficiency ntawm daim ntawv tuaj yeem txhim kho tau zoo. Txawm li cas los xij, hauv kev siv tiag tiag, qhov concentration thiab viscosity ntawm CMC yuav tsum tau hloov kho raws li cov kev xav tau tshwj xeeb kom ntseeg tau tias nws cov txiaj ntsig zoo tshaj plaws.
Post lub sij hawm: Aug-13-2024