Kev tswj thiab kev siv cov kua nruab tsuag
Peb yog ib lub tuam txhab luam ntawv loj hauv Shenzhen Tuam Tshoj. Peb muaj cov phau ntawv luam tawm, phau ntawv xov xwm luam ntawv, phau ntawv luam ntawv, phau ntawv nyuaj, phau ntawv luam tawm, phau ntawv luam tawm, phau ntawv luam tawm, lub thawv ntim, daim qhia ntawv, txhua yam ntawm PVC, cov ntawv luam tawm, ntawv sau cia, hom tshwj xeeb ntawv xim luam tawm khoom, kev ua si cardand li ntawd.
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Txij thaum tsoos offset luam tawm ntawm txoj cai ntawm tus cwj pwm xiam oob khab, kev siv thiab kev tswj ntawm cov ciav dej hauv offset luam ntawv yog qhov tseem ceeb ntawm kev luam ntawv. Txawm tias tsis muaj dej tsis zoo, tabsis yav tas los, tsis muaj dej tsis siv, tsis muaj kev siv li cas los tswj cov kev ntsuas dampening hauv offset printing, thiab siv ntau dua kev siv tshuaj dampening, Nws tseem yog ib lub ntsiab lus tseem ceeb uas peb yuav tsum tau tshawb xyuas.
Cia peb pom tias lub hauv paus dej dawb hauv plhaws li cas:
Ua ntej, cov dej ntub dej ua rau cov dej ntim uas tsis muaj xim nyob rau hauv lub tsho dawb ntawm cov ntawv xov xwm kom tiv thaiv infiltration ntawm tus cwj pwm mus rau seem ntawm daim duab.
Qhov thib ob, vim muaj kev sib tiv tauj thiab kev sib txhuam ntawm cov thawv ntim ntawm lub thawv, cov dej thiab cov ntawv xov xwm, thiab qhov ua ntu zauv thiab cov khoom siv luam tawm, qhov saum npoo ntawm cov ntawv phaj yog rubbed, uas ua rau cov kua qaub nyob rau saum npoo ntawm ntawv phaj. Cov kua txiv electrolyte nyob rau hauv qhov chaw kho vaj tse kho vaj tse cov dej uas ua kom raug thiab kho cov dej ua kua tshiab tshiab.
Tsis tas li ntawd, lub qhov dej txhim kho muaj peev xwm tswj tau qhov kub thiab txias thaum lub sij hawm luam ntawv, tshem tawm cov cua kub los ntawm kev sib txuam ntawm lub tshuab khoom thiab cov khoom xws li kua.
Lub dampening solution kuj muaj qee tus cwj pwm kev ua haujlwm rau tus lej membroiding thaum lub sij hawm luam ntawv (guaranteeing ib qho tshwj xeeb ntawm tus lej emulsification tus nqi, uas yog ib qho tseem ceeb heev rau kev hloov ntawm tus cwj pwm hauv cov ntawv luam), thiab ceev nrooj realizes tus number case thiab dej tshuav nyiaj li cas.
Hauv qab no peb yuav ntxiv kev sib tham txog kev tswj ntawm dampening daws nyob rau hauv ntau lawm.
Ua ntej, pH tus nqi ntawm cov ciav kua
Nyob rau hauv cov txheej txheem ntawm offset printing, vim tias lub tshuab luam ntawv ntawm kev luam ntawv thiab qee qhov lwm yam vim li cas, nws yooj yim los tua cov txheej txheem hydrophilic oxide rau ntawm daim phaj PS, thiaj li yuav tsum tau txheeb xyuas kom pom tseeb acidity nyob rau hauv thiaj li tsim ib tug tshiab hydrophilic ntsev. Txheej, kho cov txheej txheem hydrophilic hauv lub sijhawm. Tsis tas li ntawd, nyob rau hauv cov txheej txheem luam ntawv, kev dampening yog qhov tseeb weakly acidic, thiab nws tseem tshem tawm cov roj tsuas nyob rau hauv ib qho dawb paug ntawm qhov layout. Xyaum tau ua pov thawj tias rau PS version, tus nqi pH ntawm dampening kua uas zoo tshaj plaws raws li cov kev xav tau luam tawm tshuab 5-6.
Thaum lub pH ntawm cov tshuaj yog tsawg, nws yuav tsis tsuas yog ua si lub luag hauj lwm ntawm repairing phaj ntawv, tab sis yuav viciously corrode print phaj, thiab yuav tsis tsim ib cov dej ruaj ruaj hydrophilic. Kev sib xyaw ntawm cov duab nraaj ntawm lub phaj luam ntawv thiab lub phaj hlau nws yog tseem tau muab pov tseg, uas yog txo cov kev lag luam ntawm cov ntawv luam tawm. Tsis tas li ntawd, lub tshuaj dampening reacts nrog drier nyob rau hauv cov cwj pwm, li no ncua cov ziab ntawm tus number case thaum lub sij hawm luam ntawv, uas ua rau smudging rau sab nraum qab ntawm cov ntawv thiab cuam tshuam tus nqi ntawm tus lej feem ntau.
Yog tias cov pH ntawm cov tshuaj daws loj dhau lawm, cov lauj kaub ntim quav ntawm cov duab seem yuav tsum ua ntej, uas ua rau muaj kev lag luam hauv cov phaj luam ntawv. Tsis tas li ntawd, cov pab pawg neeg nyob hauv qhov kev daws teeb meem yuav tshwm sim nrog cov fatty acid nyob hauv tus cwj pwm kom tsim tau ib tus neeg ua haujlwm heev. Cov pawg neeg muaj zog txaus, muaj kev loj hlob zoo li cov neeg ua haujlwm xws li hydrophilic, tuaj yeem ua rau emulsion emulsion loj heev thaum luam ntawv.
Qhov ntau ntawm cov txiaj ntsig pH saum toj no tsis yog qhov kev khwv tsis tiav. Cov mob uas yuav tsum tau muaj nyob rau hauv cov khoom muaj tiag tiag thiab cov pH ntawm cov ciav kua tsis yog tas li. Uas yog hais, hauv kev luam ntawv, nws yog ib qho tsim nyog yuav ua rau qee qhov kev hloov kho rau tus nqi pH ntawm dampening tov raws li qhov tseeb qhov teeb meem.
1. Cov nyhuv ntawm acidity thiab alkalinity ntawm dampening kua. Lub pH ntawm daim ntawv no zoo dua nruab nrab, tab sis qhov tseeb, acidity thiab alkalinity ntawm ntau cov ntaub ntawv yog sib txawv vim sib txawv papermaking kev. Feem ntau hais lus, cov ntawv tsis-coated xws li offset ntawv muaj pH nqi ntawm 4.5 mus rau 7.0, uas yog weakly acidic; daim ntawv coated muaj pH ntawm 7.0 mus rau 9.0, uas yog weakly alkaline, thiab tus neeg ua haujlwm luam ntawv tuaj yeem siv qhov dampness raws li qhov xwm ntawm daim ntawv tseeb. Cov kua yog hloov kho. Thaum daim ntawv acidic, cov pH ntawm txoj kev dampening yuav loj dua (thaum luam ntawv ntawv offset, pH tuaj yeem tswj tau ntawm 5.5 thiab 6.5 nyob ntawm qhov teeb meem no). Thaum daim ntawv yog alkaline, cov pH ntawm txoj kev dampening yuav me me (Feem ntau, thaum luam ntawv coated ntawv, pH ntawm dampening tshuaj yuav tswj tau 4.8 rau 5.0, thiab tuaj yeem txo tau raws li qhov teeb meem).
2. Thaum lub plhaub ntawm lub plhaub taum ploj zuj zus tuaj, tus number case hauv daim duab nrawm yuav tawg mus rau seem tsis txaus, uas yog nws "lo lus" qias neeg "; Thaum twg tus nqi ntawm cov kabmob hauv tus cwj pwm nce ntxiv, lub viscosity ntawm tus number case rises thiab cov zauv ua cov thicker, thiab qhov seem ntawm cov phaj luam Lub adhesion nce, thiab lub phaj qias yog nws tshwm sim; Thaum cov ntawv luam tawm tsis siab nyob hauv lub zog, qhov tshwm sim ntawm ntog tawm cov hmoov av yog qhov mob hnyav, yog li ntawd hydrophilic ntsev txheej ntawm lub phaj yog yooj yim hnav; Thaum lub ambient qhov kub siab, Cov dawb dawb fatty acids yog sib cais los ntawm tus number case, uas yuav hnov mob nrog OH nyob hauv qhov ciav kua, uas ua rau tus cwj pwm loj loj emulsification. Nyob rau hauv cov saum toj no mob, nws yog ib qhov tsim nyog yuav tau them sai sai mus rau tsim nyog txo qhov pH ntawm dampening daws kom nce acidity ntawm kev daws.
Qhov ob, qhov nyiaj dampening kua
Qhov nyiaj dampening siv nyob rau hauv cov txheej txheem luam ntawv yuav tsum tau tswj kom zoo. Lub hauv paus ntawm kev tswj cov nyiaj dampening tshuaj yog txo cov nqi ntawm tus cwj pwm nyob rau hauv rooj plaub uas tsis muaj qhov seem tsis huv thiab tus number case tsis nyob hauv loj emulsification.
Qhov nyiaj dampening tshuaj tsawg dhau lawm, nws yog pom tseeb tias nws yuav tsis tiv thaiv lub seem dawb ntawm cov ntawv phaj, uas yuav ua rau cov qhov muag plooj, muab cov tshuaj txhuam thiab cov pa phem.
Yog hais tias cov nyiaj dampening kua ntau dhau lawm? Yog hais tias cov ntsiab lus ntawm lub khob ntawm lub phaj loj heev, qhov ceev ntawm cov ntawv luam tawm yuav txo, thiab cov teev yuav tsis muaj tseeb; lub luam ntawv yuav qhuav, uas yuav ua rau sab nraum qab ntawm cov khoom luam tawm mus qias neeg; daim ntawv yuav nqus cov dej ntau dhau thiab cov roj yuav tsis tuaj yeem ua ntau dua.
Qhov nyiaj dampening siv nyob rau hauv qhov chaw ua hauj lwm tsis zoo li qub, thiab qee qhov kev haum tsim nyog yuav tsum tau ua raws li qee qhov tshwj xeeb:
1. Kub: Qhov kub siab tshaj qhov kub thiab cua sov, qhov ntau dua qhov noj tau ntawm dampening kua. Tshaj kub ntawm qhov xaum xoom ntawm lub tshuab luam ntawv mas yog cov cua ntawm txoj hlua khau nruab nrab ntawm cov taub dej thiab tus cwj mem. Qhov siab dua qhov kub thiab txias dua, lub dampening sai rau ntawm lub phaj, dej rau cov menyuam, thiab cov quav rau cov menyuam yaj, thiab ntau dampening kua penetrates rau hauv tus number case. Yog li ntawd, thaum lub ntsuas kub siab, nws yog ib qho tsim nyog yuav tau nce tus nqi ntawm dampening daws.
2. Ink: Ink emulsification yog qhov zoo tshaj plaws uas cuam tshuam rau qhov nyiaj dampening kua. Tus nqi tseem ceeb ntawm tus cwj pwm uas tau txais dej yog nruab nrab ntawm 20% thiab 25%. Thaum tus nqi tseem ceeb dhau lawm, cov xim pigment yog nyob hauv ib lub xeev tsis pub leej twg, tus viscosity ntawm tus cwj pwm tsis zoo, qhov hnyav tsis zoo, thiab cov khoom xa tawm tsis zoo, thiab hom roj-hauv-dej yog emulsified. Rau cov thev naus laus zis uas tsis muaj viscosity thiab hloov ua zoo, qhov nyiaj dampening kua tsawg zog; txwv tsis pub, nws loj dua. Tsis tas li ntawd xwb, yog hais tias tus lej ntawm tus cwj mem loj loj, qhov dampening tshuaj yuav tsum tau nce kom haum.
3. Sau cov duab nraaj: Feem ntau hais lus, qhov dampening solution ntim tau me ntsis loj tshaj qhov ntawm kab ntawv kab; cov ntawv nyeem yog me ntsis loj tshaj qhov nruab nrab version, thiab cov nyiaj dampening kua yog me ntsis loj dua.
4. Kev Sau Ntawv Zuj Zus: Thaum twg qhov tshuab luam ntawv nce siab ntxiv, qhov nyiaj dampening yuav tsum nce ntxiv.
Qhov peb, hais txog kev haus dej cawv dampening
Niaj hnub no, vim muaj ntau qhov txiaj ntsig ntawm cawv dampening daws, nws siv tau nrov heev thiab txhawb.
Cov txheej txheem tseem ceeb ntawm cov dej cawv dampening yog dej, tsim nyog haus dej cawv (los yog isopropanol) thiab cov kua dej ciav. Qhov concentration ntawm cawv muaj ib tug zoo cawv rau kev siv dampening kua.
Ua ntej peb mus saib lub luag haujlwm ntawm dej caw hauv luam ntawv:
1. Txo qhov kev nruj ntawm qhov dampening solution los txhim khu lub peev xwm ntawm lub phaj.
2. Ua kom lub cev qhuav dej ntawm qhov dampening solution kom nws yooj yim dhau los ntawm qhov kev sib txawv ntawm cov menyuam.
3. Txhawb kom ceev cov xuab zeb ntawm xaj kua hlau thiab xoos xuab zeb thaum uas tiv thaiv kom tsis txhob muaj ntau hom emulsification ntawm tus number case.
4. Thaum qaug zog, noj tshav kub thiab muaj cua txias.
Ntawm no peb tham txog kev tswj ntawm cawv dampening kua los ntawm ntau yam xws li cawv concentration thiab kub.
Hauv kev siv cov tshuaj tsis haum, thawj cov nyhuv ntawm qhov dej cawv yog qhov kev nruj ntawm lub dampening kua. Qhov ntau dua qhov concentration, qhov me me qhov nro ntawm nrawm dampening. Kev paub tau pom tias nws yog ib qho kev haum siab uas tswj kev haus cawv ntawm 10% mus rau 15%. Yog hais tias cov concentration ntawm dampening kua yog tsawg dua 10%, cov nyhuv tsis pom tseeb; yog tias ntau dua 30% ntawm cov cawv yuav flocculate nrog lub colloid nyob hauv kev daws teeb meem, rhuav tshem cov tshuaj tsis haum.
Hauv cov txheej txheem ntau lawm, nws yog ib qho tseem ceeb uas yuav tau muab qhov qis tshaj plaws ntawm cov dej cawv. Seb nws puas yog ntsuas los yog ntsuas kev ntsuas, kev tswj kom zoo, tshwj xeeb tshaj yog kev ntsuas kev ntsuas, thiab kev mloog zoo yuav tsum tau them rau kev tswj hwm kev tswj. Tsis tas li ntawd, thaum muaj cov kab ntawm cov pos hniav hauv qhov tshuaj, cov ntaub ntawv uas ntsuas thiab qhov tseeb cov ntaub ntawv yuav txawv. Piv txwv li, thaum lub ntsiab lus ntawm cov pob zeb ntawm cov pob khaus no yog 2%, thaum lub sij hawm cov kua cawv ntawm cov tshuaj yog 12%, cov ntaub ntawv peb ntsuas yuav Will 5.5%.
Vim hais tias haus cawv muaj kev kub ntxhov, yog tias qhov ntsuas kub tsis zoo, kev haus cawv ntawm cov ciav dej yuav tsis zoo. Tsis tas li ntawd, cov tshuaj cawv dampening tau txais kev ruaj ntseg zoo tshaj plaws nyob rau ntawm lub cev tsis tshua muaj siab, uas yog qhov zoo tshaj rau kev xa cov dej rau cov tub ntxhais thiab cov ntawv xov xwm, tab sis qhov kub ntawm lub dampening kua tsis tau tsawg dhau, yuav ua rau qhov kub ntawm tus cwj mem. Kev txo qis, qhov kev hloov pauv tuaj yeem txo, yog li qhov ntsuas kub ntawm txoj kev dampening yuav tsum tau tswj kom zoo nyob rau hauv ntau lawm. Feem ntau, cov dej kub ntawm cov ciav dej yog tswj ntawm 10 mus rau 12 ° C hauv lub tso saum npoo, thiab qhov ntsuas kub nyob hauv dej tank yuav tsum raug tswj kom txog li 14 txog 15 ° C.
Kev tswj ntawm dampening kua tshuaj kua. Rau qhov sib ntxiv ntawm dampening kua, nws yog feem ntau yog tseeb siv txoj kev coj ua. Qhov concentration ntawm dampening kua yog proportional rau cov conductivity ntawm dampening kua. Qhov ntau dua qhov concentration ntawm dampening daws, ntau dua qhov conductivity ntawm dampening daws. Cov kev sim tau qhia tau tias nws tsim nyog los tswj cov kev sib txuas ntawm cov ciav dej hauv qhov ntau ntawm 700 txog 1700 μs / cm. Nws tuaj yeem raug kho raws li hom ntau hom thiab qauv, piv txwv, Vegra 3300ph lossis Superdot fs-12 hom ciav dej. Kev ntsuas yuav tsum raug tswj kom ntau txog 1000 txog 1300. Kev ntsuas thiab tswj, nws yog qhov yuav tsum tau ntxuav lub taub dej hauv cov dej tsis tu ncua, vim hais tias txawv teb chaws hauv dej tank (hmoov ntawv, kua xim, xim, hmoov av, thiab lwm yam. nkag mus rau lub cev qhuav dej) yuav cuam tshuam qhov tseeb ntawm kev ntsuas.
Saum toj no peb tau sib tham txog qee yam ntawm kev tswj thiab kev siv cov ciav hlau nyob hauv kev ntaus ntawv. Hauv kev ua hauj lwm tiag tiag, ntau yam muaj feem xyuam nrog kev siv tshuaj tsis haum yog tsis tshwj xeeb, tab sis muaj kev txwv ntau, uas yuav tsum tau kom peb txiav txim siab zoo dua hauv kev xyaum ua, kom tswj tau zoo dua.