Kev txheeb xyuas cov txiaj ntsig ntawm cov ntawv pH tus nqi ntawm kev luam ntawv zoo ntawm phau ntawv

Kev txheeb xyuas cov txiaj ntsig ntawm cov ntawv pH tus nqi ntawm kev luam ntawv zoo ntawm phau ntawv

Daim ntawv yog qhov zoo dua nruab nrab thaum lub sijhawm luam ntawv, uas yog, tus nqi pH nyob ib puag ncig 7, lossis me ntsis alkaline. Piv txwv li, tus nqi pH ntawm cov ntawv coated, offset paper thiab sau ntawv feem ntau siv hauv offset luam ntawv yuav tsum yog nruab nrab. Nws yog ib qho tsim nyog los kaw qhov kev yuav cov ntawv zoo, number case thiab PS version. Tus nqi pH ntawm daim ntawv tuaj yeem ntsuas los ntawm pH daim ntawv xeem lossis los ntawm lub ntsuas pH ntawm xob laim.

Cov txheej txheem luam ntawv yuav tsum muaj pH ntawm daim ntawv kom nruab nrab. Txawm li cas los xij, vim qhov sib txawv ntawm cov khoom sib txawv, cov khoom ntim, thiab cov xim thaum lub sij hawm pulping, daim ntawv yuav yog acidic, los yog cov txheej txheem luam ntawv yuav tsum tau daim ntawv yuav pH nruab nrab. Txawm li cas los xij, vim qhov sib txawv ntawm cov khoom sib txawv, cov khoom ntim thiab cov xim thaum lub sij hawm pulping, daim ntawv yuav yog acidic lossis alkaline. Piv txwv li: Vaseline yog siv rau qhov loj me hauv cov txheej txheem papermaking. Muaj qee cov chlorine seem thiab cov organic acids hauv cov tawv nqaij. Yog tias tsis ua raws li kev kho mob kom zoo, daim ntawv tsim yuav yog acidic; caustic soda (NaOH) yog siv rau hauv cov txheej txheem papermaking. ) thiab alkaline fillers thiab colorants, residual lye nyob rau hauv slurry, thiab lwm yam, thiab tsis muaj kev kho mob tsim nyog, cov resulting ntawv yuav alkaline.

Acid daim ntawv yuav inhibit qhov ziab ntawm luam ntawv number case. Qhov muaj zog acidity, qhov qeeb ntawm tus number case kom qhuav ceev. Muaj ib qho piv txwv ntawm cov luam yeeb ntim rau lub Hoobkas luam yeeb ntawm ib zaug, tib tus cwj mem, tib lub xovxwm offset, thiab ob daim ntawv coated sib txawv, txawm li cas los xij, qhov ziab nrawm yog sib txawv heev. Tom qab hu rau lub Hoobkas coated ntawv, tus thawj tswj xyuas tau soj ntsuam tias yog vim li cas rau qhov qeeb ziab ntawm daim ntawv coated yog tias daim ntawv muab tub lim thiab roj hmab muaj cov kua qaub, uas ua rau cov ntawv coated yog acidic. Cov acidity thiab alkalinity ntawm daim ntawv muaj kev txiav txim siab ntawm cov txheej txheem luam ntawv thiab ziab ntawm cov ntawv luam tawm, thiab cov ntawv acid inhibits lub conjunctiva ntawm cov ntawv luam tawm. Tus number case dries peb zaug qeeb dua li daim ntawv pH qis ntawm 5.5 mus rau 4.4. Cov ntawv yog acidic, uas tseem cuam tshuam cov xim ntawm cov khoom luam tawm.

Cov alkalinity ntawm daim ntawv feem ntau yog yuam kev rau kev ceev kom qhuav ntawm number case. Qhov tseeb, cov nyhuv tsis pom tseeb, tab sis nws nrawm dua, thiab nws tsis yog qhov sib npaug. Nyob rau hauv letterpress, gravure, thiab tshuaj ntsuam luam ntawv txoj kev, cov acidity thiab alkalinity ntawm daim ntawv tsuas yog cuam tshuam rau lub ziab ceev ntawm tus number case. Hauv offset luam ntawv, acidity thiab alkalinity ntawm daim ntawv tsis tsuas yog cuam tshuam rau ziab ntawm tus number case. Vim hais tias cov tshuaj offset luam dej thoob dej tsis huv, muaj cov tshuaj acidic uas muaj peev xwm ntxuav xws li surfactants thiab wetting agents. Yog tias tus nqi pH ntawm daim ntawv siab dua 9 lub sijhawm no, cov tshuaj alkaline hauv daim ntawv yuav raug neutralized nrog cov acidic Cheebtsam hauv cov tshuaj aqueous thaum lub sij hawm luam ntawv, uas yuav cuam tshuam rau pH tus nqi ntawm cov kav dej. Tsis tas li ntawd, daim ntawv kua qaub yuav emulsify tus cwj mem, ua rau muaj qhov tshwm sim ntawm ntab.

Yog tias daim ntawv muaj cov kua qaub dawb, daim ntawv yuav maj mam eroded los ntawm cov kua qaub, txo cov durability ntawm daim ntawv. Thaum luam ntawv kub, nyiaj thiab kub stamping, cov kua qaub thiab alkali ntawm daim ntawv yuav hnov ​​​​mob chemically nrog cov hmoov hlau, kom cov imprinted thiab kub stamped anodized aluminium ntawv ci yuav hloov xim thiab poob nws thawj brightness thiab xim.

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