Sib tham txog lub tswv yim ntawm cov cwj mem kua thiab dej tshuav nyiaj txiag hauv lithographic printing
Peb yog ib lub lag luam loj hauv Shenzhen Tuam Tshoj. Peb muaj cov phau ntawv luam tawm, phau ntawv nyuaj, 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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1. Taw qhia
Lithographic Litho Graph (Offset) luam tawm los ntawm lithographic ink-repellent printing method invented los ntawm A. Senefelder nyob rau hauv 1797. Lithographic luam ntawv thiab lwm yam kev pabcuam, gravure thiab screen printing yog siv los tsim ntau yam qauv luam tawm. Lwm txoj kev luam tawm tsuas yog siv ib hom cwj mem zauv los tsim kev luam thiab xa mus rau qhov sau. Lub phom lithographic yuav tsum siv ob lub kua los tsim cov ntawv. Tsuas yog cov ntawv luam tawm (roj) ntawm cov ntawv luam tawm ntawm lub phaj (tshwj tsis yog rau cov ntawv kab rov tav), tab sis lub phaj yuav tsum muaj dej nrog kom luam. Ib feem ntawm tus qauv yog them nrog ib txheej ntawm dej, thiab cov ntawv luam tawm yog dej-soluble tshem dej. Thaum twg tus number case yog siv, cov ntawv luam tawm yog oily thiab tsis muaj dej, yog li nws yog qhov yooj yim kom tus number case txaus rau ntawm cov roj nyeem. Ntawm qhov tsis sib txuas, hauv qhov tsis yog luam tawm, vim hais tias cov dej yog pre-coated, tus number case txheej tsis tuaj yeem, thiab tsuas yog cov ntawv luam tawm nrog roj tuaj. Hauv kev luam, luam tawm ntawm cov ntawv luam tawm los ntawm daim pam, tab sis qee qhov uas tsis yog luam tawm ntawm dej kuj tshem tawm ntawm daim pam, tiam sis feem ntau cov tshuab luam ntawv tsuas them nqi rau cov ntawv luam tawm ntawm cov ntawv luam tawm thaum lub sij hawm tsim. Hloov, tsis tshua pom qhov tseeb tias qhov uas tsis yog luam tawm ntawm cov dej tau pauv, thiab txawm tsis pom tias qhov teebmeem ntawm cov ntawv tsis yog luam ntawm cov dej ntws seem uas nyob rau ntawm cov ntawv luam tawm, uas yuav tshwm sim tom qab- luam ntawv number case Tej teeb meem hauv kev hloov. Yog cov dej zoo lithographic soj ntsuam, cov nyhuv yog xyeej qhov hloov ntawm cov cwj mem, thiab dej txheej txheej dej uas kis tau tawm ntawm cov ntawv tsis yog luam tawm ntawm cov ntawv luam tawm mus rau qhov chaw ntawm cov ntawv luam tawm ntawm cov ntawv luam tawm kuj ua tus luam ntawv muab luam tawm. Thaum txuas, qee qhov chaw yuav tsis txais. Tshwj tsis yog muaj ntawv zoo nruab nrab, nws yuav muaj ntau qhov "qhuav" luam tawm nto ntawm qhov xim xim ntxiv tom ntej. Yog li, muaj ib cov qauv siv lub tshuab luam ntawv tshiab uas niaj hnub siv los ntawm ib pawg ob-xim qhov system mus rau ib chav nyob rau xim, thiab tsis muaj qhov tsim ntawm ob hom xim.
Hauv kev tshawb xav, txhua tus tau hais tias lithography siv lub hauv paus ntsiab lus uas roj thiab dej tsis sib xyaw kom tiav cov nyhuv ntawm qhov txawv ntawm luam thiab tsis luam tawm. Qhov tseeb, qhov kev sib cav no muaj nws cov hauv paus, tiam sis tsis yog ob qho no yog 100% unmixed. Feem ntau tus cwj mem xiam tseem muab xa mus rau hauv dej, tab sis lub plhaub ntim ntawm cov ntawv luam tawm ntawm cov ntawv luam tawm yog xa mus rau cov ntawv luam tawm, daim pam thiab daim ntawv luam tawm, uas muaj ntau dua los yog tsawg dua dej tshwj tsis yog tias tsis muaj cov luam tawm. Nws yog tau hais tias tsuas yog 100% ntawm tus number case tsis muaj dej. Yog vim li cas thiaj yog tias tus number case no yuav tsum muaj ib feem pua ntawm kev sib tw nrog dej cov ntsiab lus los ua rau kev sib tw. Qhov teeb meem no ntev li ntev tau muaj poj niam estrogens rau cov txiv neej. Yog hais tias muaj ntau estrogens, txiv neej muaj cov poj niam cov yam ntxwv zoo. Cov poj niam kuj muaj txiv neej hormones, tab sis tsis ntau dhau lawm, txwv tsis pub cov ntxhais yuav tau ntev beards. Hauv lithographic cim, nws yuav tsum muaj txog 5 ~ 28% emulsified dej. Qhov no yog qhov phenomenon ib txwm thiab ib qho chaw ruaj ntseg uas tsim nyog rau kev thab plaub. Ib yam li 38 ° degree ntawm North thiab South Kauslim raws sab qaum teb, muaj kev sib cais ntawm ob tog. Zoo li tsis muaj tub rog. Nyob rau hauv cov tub ceev xwm, nws yog feem ntau tsis txaus los ntes cov neeg raug kaw. Tub ceev xwm lub zog tsis txaus. Yuav tsum muaj "netizen" nyob rau hauv lub qhov muag ntawm tub ceev xwm. Nws yog kev yooj yim rau kev tswj hwm. Ntawm sab hauv, nws yog qhov tsim nyog los nrhiav kev qhia los daws qhov teeb meem. Txwv tsis pub, nws yog qhov nyuaj rau kev tswj hwm qhov kev tshuav ntawm kev ruaj ntseg rau pej xeem. . Yog hais tias tus lithographic number case yog 100% cov tshuaj pleev cov dej, cov lithographic number kom tshuav yog ib qho yooj yim li ntsuas ntawm cov hlua hlau. Ntev li ntev tau dej ntau me ntsis ntawm tus cwj pwm, lub tshooj luam tawm yog muab tshem tag nrho. Ib qho me ntsis uas tsis yog luam tawm ntawm cov dej ua tag nrho version. Kev lithographic luam tawm, muaj kev npau suav yooj yim yooj yim. Feem ntau, lithographic inks yuav tsum muaj dej kam rau siab txog 18 ~ 35%. Qhov no tsis pom zoo rau luam ntawv. Hauv kev lag luam, qhov siab tshaj plaws yog siv rau, vim tias qhov siab tshaj plaws ntawm kev txwv ntawm kev ruaj khov yog dhau los, tsis yog tsuas muaj ntau cov xim dawb ntawm cov ntawv luam tawm thaum sau luam tawm, tab sis txawm tias tus lej yuav muab faib kom txog thaum nws tsis muaj khov tsis muaj peev xwm poob nws txoj kev hloov, thiab tom ntej no tsis nyob rau ntawm qhov teeb meem ntawm tus neeg ploj thiab cov ntawv phaj, qhov kev ua tiav ntawm lub luam tawm ntawm cov ntawv luam tawm ntawm cov ntawv luam tseem ceeb heev. Lub xaj kua roj yuav tsum muab ntxuav rov qab los luam tawm.
Nyob rau hauv ib co printing pressures manufacturers, kom ua cov lithographic luam ntawv yooj yim, luam ntawv me me thiab me me loj printing xws li luam ntawv yas phaib yog siv tawm ntawm cov Kev Siv Dej Kom Tsis Txhuam Dej, uas yog ib daim ntawv luam nrog txhua kab rov tav luam tawm inks. Cov xim thim rov qab yog siv tsis zoo, ces tus cwj mem tsis zes rau ntawm cov khoom siv qis ntawm cov txheej txheem silicone thaum lub plhaub ntim siv, thiab tus number case yog tsim hauv cov ntawv luam tawm tsis tas silicone. Daim ntawv sau npe no muab xa mus rau ib qho kev luam tawm ib zaug. Nws tsuas yog tsim nyog los tswj cov cua ntawm lub tshuab luam ntawv thiab tus number case khoom zoo heev, kom tsis txhob muab cov neeg pluag hloov ntawm cov ntawv luam tawm ntawm lub qhov kub tsis dhau, los yog qhov tsis zoo ntawm cov ntawv luam tawm uas tsis yog luam tawm rau qhov kub tau siab dhau. Tsis tas li ntawd, vim hais tias tsis muaj kab rov tav luam tawm yog ib hom kua roj hmab nkaus xwb, tsis muaj teebmeem nrog kua number case-fluid ob-fluid printing. Nyob rau xyoo 1980, tseem muaj ntau tus neeg tawm tswv yim. KBA tau tsim lub Cortina tsis pub dawb watermark. Lub tshuab muaj qhov zoo ntawm qhov zoo, kev siv tau thiab cov ntawv luam tawm sai, thiab tsis muaj khib nyiab, thiab muaj ib txoj kev loj hlob tshiab.
2. kev tsis sib xws ntawm tus cwj pwm xaj thiab dej
Yog tias koj xav ua tus lithographic machine ink-balanced, los ntawm tus number case system, qhov dej system, los ntawm tus npaug ntawm lub npoo tub rog, lub dab taub hau, rau lub phom-tig (kov) muaj ib lub kab dav heev thiab cov menyuam yaus. Lub voj voog ntawm qhov cylinder nto, txwv tsis pub lub kab ntawm lub rollers yog inconsistent, thiab muaj concave defects nyob rau saum npoo ntawm tus menyuam. Txawm hais tias qhov zoo tshaj plaws technician xav kho ob lub tshuab, nws yog ib qhov tsis yooj yim sua. Ntev npaum li lub taub yog inconsistent, nplaim yog concave, thiab cov npoo yog tsis ncaj, dej yuav tsis ncaj, dej yuav tsis ncaj ncees, thiab dej yuav tsis ncaj ncees. Nws yuav tsum yog qhov chaw qhuav, thiab nws yuav tsis qias vim dej tsis txaus. Lub qhov chaw wettest yuav tsum yog Nws yog ib qho teeb meem uas cov dej muaj ntau dhau lawm, thiab nws yog yooj yim ua emulsification. Yog tias muaj dej tsawg, nws yuav ua rau qias neeg vim dej tsis txaus. Cov tsis sib haum ntawm cov dej hauv dej tsis yog ib qho me me xwb, tab sis cov dej hauv dej kuj tuaj yeem yog cov dej tsis pub dej los yog dej-tau txais yog tias nws yog daim xuas ntim los sis number case mordant (Fan Lishui). Txo, qhov teeb meem yog zoo li qhov tawg nto ntawm cov dej ntawm cov dej. Tib yam yeej muaj tseeb rau cov tub ntxhais muaj cuav. Cov kab no tsis zoo, lub khob qhov rooj tsis zoo, qhov saum npoo tawg, thiab tus cag ntawm tus cuav quav rau cov menyuam yaus nrog cov roj carbon dioxide colloid. Thaum nws yog ntub, nws yuav deinked. Nws yog tib yam li dej haus, tab sis cov nyhuv rov qab. Kuv tuaj yeem tsis tau lo av, tab sis tus number case xim yuav ploj mus, thiab txawm tias tag nrho cov xaum xoom cheeb tsam tsis muaj teeb meem loj nrog rau number case. Uniformity, tsis muaj teeb meem ntawm qhov chaw, tsis muaj adhesion rau dej los sis number case transfer deposits, thiab lwm yam., Yog qhov tseem ceeb hauv lub plhaub ntawm tus cwj mem thiab dej, kom du du luam tau.
Qhov kev tsim nyog ntawm cov dej ntawm lub taub hau thiab tus cwj pwm ntim thiab qhov kev hloov ntawm cov tub ntxhais kawm ntawv qhov kev ua tau zoo kuj yog cov tseem ceeb rau kev hloov cov dej hauv dej, vim hais tias muaj coob leej neeg siv cov quav cuav, dej dej, thiab txawm lub raj xa tuaj sau tus number case thiab pom nws. Qhov dav thiab dav ntawm txoj kev sib cuag yog siv los txiav txim qhov kev siv ntawm cov xovxwm los kho qhov siab ntawm tus menyuam. Qhov no tsuas yog tus neeg txheeb ze, tab sis tsis muaj meej meej. Xws li qhov tseeb yog tus txheeb ze? Piv txwv, qhov dav ntawm 5 hli yog hnyav heev! Nws yuav tsum pom tias nws yog 4 hli lossis 3 hli, thiab 6 hli yog qhov sib txuas ntxiv. Txawm li cas los xij, txoj kab uas hla ntawm lub taub hau los yog lub tshuab luam ntawv yog txawv. Thaum twg qhov kev tiv tauj amplitude zoo li qub, nws tsis txhais hais tias lub siab zoo li qub. Yog tias txoj kab uas hla txoj kab yog ob npaug, qhov sib npaug zog yuav tsum muab doubled los ua zoo li qub. Raws li rau lub me me lub cheeb, tib yam kuj tseem yuav tsum tau. Nws yog qhov tsim nyog kom txo qhov loj ntawm cov kev pabcuam los xam, qhov siab yuav raug tsim zoo thiab tsis dhau hnyav. Tsis tas li ntawd, tag nrho cov roj hmab xees thiab cov ntawv xov tooj ntawm lithographic tshuab luam ntawv yog teem rau hauv ib qho nyuaj thiab muag muag, thiab cov yas muag yas los yog rubber roj hmab raj nrog daim pam siv raws li lub cev tawm ntawm lub plab rov qab thaum muab nias. Yog li no, cov ris tsho hnyav, Cov Nqaij Ntoo Hardness tseem cuam tshuam rau kev sib raug zoo, tib qhov chaw loj loj los yog hu rau qhov siab, rubber tawv muag ★ lub plhaub tiab loj yuav tsim dua siab, nplaum roj hmab los sis roj hmab Cov ntaub qhwv lub cev padding intrusion siab tuaj yeem tsuas muaj qhov siab ntawm 0.05 ~ 0.07mm, qhov nruab nrab tawv hom yuav muaj qhov siab ntawm 0.12 ~ 0.15mm, thiab lub qhov ncoo yuav ncav cuag 0.2 ~ 0.3 hli ntxeem tau. Kev sib zog, txwv tsis pub lub peev xim xaj ntawm lub peev xwm yuav muaj kev zuj zus ntxiv. Raws li kev tsis tshua muaj siab, vim cov dej hloov mus thiab cov neeg pluag ploj tsis hloov, nws tseem ceeb heev kom muaj txheej heev ntawm dej thiab cwj mem los hloov ntawm kev txawv txav tsis zoo. Lawm, tsis muaj tiag tiag rau cov number case thiab dej. Dej dej los yog kua xauv npo. Yog hais tias qhov txawv txav tsis yog nyob rau hauv lub emulsification ntawm tus loj npaum li cas ntawm cov zaj duab xis tuab, tsis yog tsuas muab cov ntaub ntawv hloov ntawm cov tsiaj ntawv tsis zoo, tab sis kuj luam tawm ntawm qhov teeb meem luam tawm yog o, qhov ziab tuaj lig, tom qab luam ntawv tshwm sim, thiab case xim dub thiab tsaus nti loj dua. Nws yog qhov ntau rau number case rollers thiab dej rollers yuav siv tau ntev. Cov hlau rubber yog slimmed vim tso tawm cov khoom, uas ua rau tsis txaus siab ntawm tus number case rau cov tub ntxhais thiab tus kav dej, thiab nws yog qhov yuav tsum tau ua kev kuaj xyuas kev kaw. Tom qab luam cov txeej pov tseg uas tsis muaj kev cawm dim lawm, muab plaub lub tsho thaij los yog ib cov dej rau cov quav tawm tsam lub phaj. Tsawg kawg saib lub siab ntawm lub xeem dhau mus rau qhov tsim. Nws puas tau txais kev cawmdim nquag tau? Tom qab lub tshuab nres, nias qhov inching rau pem hauv ntej los sis rov qab rov los saib cov kab rov tav ntawm tus neeg ntawm lub npoo. Yog nws zoo ib yam thiab qhov kov puas muaj ntsis? Tab sis sab hauv ntawm cov menyuam yaus kov txoj kev no tsis ua haujlwm. Yog li, txoj kev tiv tauj nias kom pom lub siab ntawm cov xovxwm luam tau yooj yim thiab siv, tab sis lub taub thiab hardness ntawm tus kwv yuav tsum tau kuaj xyuas yog lwm qhov kev qhia siv. Yog hais tias lub siab ntawm tus number plawg loj dhau lawm, qhov sib cuag dav yog qhov dav, tsis yog tsuas hloov tus lej hloov hloov xwb, tab sis tus number case yog softened thiab softened, thiab tus number case yog yooj yim emulsified thiab tus nqi muab roj nqi. Yog li ntawd, lub phaj luam ntawv yooj yim puas tsuaj, thiab cov roj hmab kub hnyiab tawm ntawm cov tawv nqaij yog tsim tawm. Raug mob.
Cov quav cuav quav yuav tsum muaj lub lipophilic rubber los xyuas kom meej tias cov zauv luam tawm adheres thiab tsis yog yooj yim deinked los ntawm colloid ntawm dej ntub dej. Ntawm qhov tod tes, cov taub dej dej xav tau ib lub hnab nqus dej hydrophilic roj hmab. Yog hais tias tus cwj mem xaws number case yog siv lipophilic roj hmab, qhov dej txaus yuav raug txo kom tsawg, thiab nws yog qhov yooj yim uas yuav ua rau tus number case los cuam tshuam txog cov dej txaus. Tseem ceeb tshaj, cov dej hauv dej tsis ua haujlwm. Hauv qab txawm muaj kua cwj pwm, nws yuav tsum ua kom dej ntau ntxiv kom lub qhov dej tsawg tshaj yog cov dej txaus, yog li qhov tsis muaj dej yuav muaj dej ntau dhau! Xeeb emulsification ntawm thaj tsam ntawm generated, qhov tsis sib luag ntawm cov dej tsis zoo, qhov kawm ntawm unsmoothness yog tsis pub tsawg tshaj ntawm lub cev deformation ntawm lub taub dej dej.
Cov quav cuav muaj feem ntau muab faib ua ob los yog peb qhov sib txawv rubber hardness qib. Cov roj hmab uas nyob ze rau ntawm tus npaug ntawm sab npoo thiab cov menyuam caij sib tw yog ib qho nyuaj, txog 35 ° Shore, thiab khov dua rau ntawm qhov kev teeb tsa kom yoojyim kom txo tau cov kev cuam tshuam. Thiab lub taub hau yog du nrog 28 ~ 30 ° Shore, lwm tus yog 30 ~ 35 ° Shore. Dej rau cov menyuam dej ntawm cov roj hmab muag uas muaj cov pa roj hmab muag uas muaj hnub nyoog 18 txog 22 °. Dej cov dej yog ib qho nyuaj thiab cov dej yuav raug txo kom tsawg dua vim yog lub siab. Tam sim no, ntau lub tuam txhab hloov lub dab dej ntawm chrome mus rau qhov chaw ua zauv. Ntawm qhov one hand, nws muaj peev xwm zam cov kev tsim ntawm chrome oxide thiab hinder lub hydrophilicity ntawm chrome roller. Ntawm qhov tod tes, cov nplais qhwv pob zeb ua kom muaj qhov zoo thiab ntev-ntev hydrophilicity. Raws li qhov no, nws yog ua tau kom txo los yog siv IPA isopropyl cawv mus ua kom tau ib qho chaw zoo dua tus phooj ywg.
3. kev tswj kev kub thiab kev ntxiv ntawm cov dej haus
Dej yog lub xeev ua kua. Tom qab nws absorbs tshav kub thiab nce mus txog qhov tseem ceeb ntawm lub plhom ntawm molecular perturbation, nws tawm sai sai thaum huab cua thaum lub siab vapor hauv cov huab cua me. Ntawm qhov tsis sib thooj, thaum dej ntub tib lub tshav kub, tiam sis cov pa hauv cov pa tuaj txog 100% ntawm kev tuaj yeem. Dej yog nyuaj rau hloov mus rau hauv lub zog thiab khiav mus rau saum huab cua. Nws yuav siv sij hawm ntau kub rau evaporate. Los ntawm qhov ua piv txwv no, peb tuaj yeem to taub tias nyob hauv tus cwj pwm-thiab-dej tshuav, yog tias cov dej tsis zoo sib xws, cov av nyob hauv cov huab cua ze ze ntawm qhov kub thiab txias, thiab cov dej tsis tshua zoo, ntau dua dej. Ntawm qhov tsis sib xws, kev kub, tsis muaj av qis nyob rau hauv huab cua, tsis muaj vapor siab, thiab sai evaporation ntawm dej, yuav ua rau cov dej tsis txaus, uas yuav ua rau dej thiab dej tshuav nyiaj ntau ntawm kev siv lub lithographic printing tshuab, cov dej ntawm lub phaj Ib qho loj npaum li cas evaporation tsis txaus, uas ua rau qhuav pob rau ntawm cov ntawv tsis yog luam ntawm tus number case. Tsis tas li ntawd, vim lub ntsuas kub tsawg thiab cov av qis heev, cov dej tsis zoo yog cov emulsified. Yog nws sau rau ntawm ib daim ntawv dawb, nws yuav yog ib qho ntawv loj heev. Nws tseem yuav ua rau cov dej ntub dej qis; luam ntawv lo nrog cov dej tsis haum, cov khoom siv hluav taws xob, cov ntawv hluav taws xob, thiab cov ntawv hlau uas tsis nqus dej, ces qhov dej nyob hauv qhov kev nqus dej yog qhov sib npaug, xwv cov dej pib ntau dhau, peb yam. Ib qho yog qhov loj me ntawm qhov tsim, qhov kub thiab txias, qhov ceev ntawv, qhov loj ntawm qhov tsim qhov loj yog, qhov kev luam ntawv ceev ceev, thiab kev siv dej yog proportional to qhov nce, thaum kev sib hloov ceev yog ceev, qhov kub tej zaum yuav nce siab ua rau lub evaporation ntawm thermal cuam tshuam, thiab lwm qhov. Yog vim li cas yog tias dej npaum li cas ntawm daim ntawv thiab dej npaum li cas los ntawm emulsified number case yog nce thaum lub sij hawm luam ntawv nce ntxiv, (qhov sib piv ntawm ob qho yog consumed, thiab cov emulsified dej siv vim hais tias muaj muaj ntau kab ntawv ntau ntxiv) Ua kom nce, nce dej noj vim muaj dej ntau ntawm cov ntawv tsis muaj ntawv luam tawm). Qhov ntsuas kub ntawm cov npoo ntawm tus cwj pwm no nce los ntawm qhov khaus ntawm tus cwj mem xaj, los yog cov cua sov yog tsim los ntawm tus cwj mem xau oscillating tus khau rubber, kom lub ntsuas kub nce siab thiab tus lej tshuav nyiaj yog kho. Feem ntau, lithographic luam absorbs ib feem ntau ntawm cov tshav kub vim muaj ntau npaum li cov dej evaporation, tab sis, feem ntau nws yog tsim rau 25 ° C. Yog li, tag nrho cov tshuab luam ntawv tam sim no siv cov dej txias dej txias kom txo tau cov dej evaporation thiab khaws tus number case muab kua number case. Cov txheej yuav txo emulsification vim zoo astringency. Txawm li cas los xij, raws li kev ceev ntawm kev luam ntawv ua tiav sai dua, los ntawm rau lossis xya txhiab nplooj ntawv ib teev mus rau 15,000, 16,000, thiab 18,000 nplooj ntawv ib xuab moos, nws tsis muaj peev xwm tswj hwm qhov kub thiab txias ntawm tus number case system los ntawm kev cia siab qhov kub tsawg ntawm cov dej noo. Hnub no, feem ntau Zhangye printing presses siv hollow steel number case rollers rau cov dej txias kom txo tau qhov ntsuas kub ntawm tus number case system. Ntev npaum li tus ntsuas siab tshaj ntawm 150 ° C, qhov tawv nqaij ntawm tus cwj pwm xaj yuav muab muag, thiab qhov ua rau kev faib tawm yuav raug txo kom tsawg. Txo tus nqi ntawm qhov muab hloov pauv tsawg, thiab nws yog ib qho yooj yim uas yuav tau emulsify. Qhov no yog lub ntsiab yog vim li cas cov ntawv luam xim muaj xim yog lub teeb thiab lub teeb nyob rau hauv kev kub ceev thiab kev sib tw ntev. Vim lub softening ntawm tus number case, qhov nruab nrab-tone ris thiab tus tswj tsis tau tswj. Tsis zoo li qhov ua tau zoo ntawm cov thawj lub cav txias, lub suab nrov tsis nce vim yog nce qhov taw tes, thiab tus cwj pwm xaws ntawm qhov chaw thiab qhov tsaus nti txo. Lub zog zoo yog qhov qis. Yog li no, tsis yog lub tshuab luam ntawv kab rov tav xwb, tab sis tseem kab rov tav luam tawm tshuab, ntxiv rau dej rau cov menyuam, muaj dej kub tswj nyob hauv dej tank, thiab tus number case rau cov tub ntxhais kawm ntawv tseem muaj lub tshuab cua txias txias los ntawm case number case los yog tus number case ciav hlau rau cov menyuam. Lub chaw absorbs cua sov kom sov qhov kub ntawm tus cwj mem hlau los ntawm nce.
Qee cov kua qaub thiab colloids yuav tsum muab ntxiv rau da dej. Ua ntej, ammonium nitrate, ammonium phosphate los yog ammonium dichromate tau siv. Ntawm lawv, ammonium dichromate tuaj yeem ua kom cov dej acidity, tsis txhob muab tus number case rau ntshis hloov mus rau alkaline tom qab tus cwj pwm muab rau alkaline. Cov roj yog "saponified", uas ua rau tus number case rau decompose thiab yaj mus rau hauv dej, ua rog thiab pigment contamination. Cov av adsorbs qhov dichromate, sib sau ntom uas tsis yooj yim oxidized thiab soiled. Ua ntej lub PS version yog tsa, nws yog ib tug heev A pabcuam los tivthaiv oxidation, los tiv thaiv ntawv hmoov sib npoo uas zoo kawg nkaus rau kev ua kom tsis txhob luam tawm. Thaum pib ntawm lub PS version, lub saum npoo ntawm txhuas phaj tsis anodized. Tom qab txhiab plhom kev hloov hauv cov ntawv nyeem, cov txhuas yuav nqus ntau cov kua chemical hauv daim ntawv, ua rau ua kom qhov luam tawm kom poob. Tom qab kev kho mob anodizing, tsis tsuas yog lub phaj ntws tau tsa mus rau 9 degrees high hardness coj tsis kam, tab sis kuj muaj peev xwm los tiv thaiv alkaline tshuaj corrosion yog ntau enhanced. Yog li, feem ntau ntawm cov dej tank kua dej mas feem ntau yog khaws cia hauv ib qho chaw nruab nrab ntawm 4.5 txog 5.5 ppm, tiam sis cov tshuab luam ntawv tsis yog sib txuas rau vim yog tus cwj mem, vim li ntawd nws yog ua rau qaug zog alkali puag ncig ntawm pH 7 lossis siab dua. Yuav kom tiv thaiv cov kab mob ntawm cov dej alkaline yaj ntawm daim ntawv, thiab lub acidity ntawm qhov tsim muaj peev xwm tuav tus number case zuj zus, cov luam ntawv yuav tsis nce, thiab ntxiv rau cov kua tshuaj acidic tseem yog ib qho tseem ceeb ntawm cov kua dej tam sim no, tias pH nqi hloov me ntsis, ntau Cov pH tsis tuaj yeem muab ntxiv rau da dej kom muaj lub cev pH ntawm 4.5 txog 5.5. Yog li, qhov tseeb cov ntaub ntawv p ntsuas tsis ntsuas, tab sis tsuas yog ib cov degree ntawm kev txiav txim siab xwb. Vim li no, cov lus nug tau pom los ntawm qhov kev tiv thaiv. Txhawm rau paub tseeb cov kua qaub tseeb ntawm cov dej ntub dej, nws tsis cuam tshuam los ntawm qhov tsis tuaj yeem. Nyob rau hauv lub dhau los, thaum lub zoo ntawm daim ntawv luam tau pluag, muaj ib txheej txheej ntawm cov pos hniav ntawm cov ntawv xov xwm los txhim kho qhov tsim teeb thiab zoo dua qub hydrophilicity. Txawm li cas los xij, thaum daim ntawv thiab ntawv hmoov muaj ntau dhau lawm, qhov teeb tsa yuav tsum ua kom zoo thiab poob. Hydrophilic thiab hydrated, yog li nws yog qhov yuav tsum tau cia siab rau lub colloid muaj nyob rau hauv lub dab dej kua kom ntxiv tau qhov noj ntawm cov pos hniav txheej txheem. Tam sim no yuav luag tsis muaj kua nplaum ntxiv, vim hais tias PS daim phaj thiab CTP phaj yog tag nrho kho nrog cov tawv oxygen rau alumina nyuaj. Cov yeeb yaj kiab yog qhov ua kom tsis muaj zog, yog li cov kua nplua nuj niaj hnub no muaj cov kua dej ua kua, tus neeg saib xyuas kev sib txuas, kev tswj tus kheej pH thiab tsis tuaj yeem, ntxiv rau IPA isopropanol.
Niaj hnub no, muaj ib qho ntxiv ntawm IPA tsis pub haus dej cawv dej tsis ntub dej kom tsis txhob muaj evaporation ntawm VOCs thiab cuam tshuam rau ib puag ncig, tab sis yuav ua li cas nrog nws tsis muaj IPA? Ua ntej txhua yam, nws yuav tsum lim thiab tshem tawm cov zaub mov xws li calcium, magnesium, iron thiab manganese hauv dej, kom cov dej muaj softened, thiab dej ntau dua, thiab cov roj thiab cov kuab tshuaj nyob hauv dej tseem tshem tawm , thiab lub hwj huam zoo tuaj yeem nyob ze rau "cov dej ntshiab" yog txhua lub sijhawm. Ib txhia siv UV lub teeb los ua photocatalyst sterilization, txo qhov tshwm sim ntawm floating teeb meem thiab pwm nyob rau hauv dej, thiab cuam tshuam thiab thaiv cov npliag lus ntawm cov kav dej. Tam sim no cov dej tsis pub haus dej cawv dej kuj yog nyob rau hauv phaum mob, uas yog txoj kev loj hlob raws li kev tiv thaiv ib puag ncig.
4. Lub hnab ntawv luam tawm txheej yog txheej tsau ntawm tus lej tshuav nyiaj li cas
Dua thiab dej tshuav dej yog qhov sib cuam tshuam ntawm cov dej txheej thiab cov ink txheej txheej, yog li ntawd qhov xim tsawg tshaj plaws ntawm cov ink tab yuav muab luam tawm kom pom cov xim uas tsim nyog, thiab cov phaj ntawv khaws cia kom huv nrog thinnest dej yeeb yaj kiab thiab me ntsis kev nyab xeeb qhov zoo tshaj plaws, uas yog qhov zoo tshaj plaws number case tshuav. hauv txoj ntsiab cai. Txawm li cas los xij, qhov kev lag luam tseem ceeb, cov tshuab luam ntawv tshiab feem ntau yooj yim dua los ua cov lej thiab dej tshuav, qhov tseem ceeb yog vim tias cov quav rau cov tub ntxhais hluas, cov dej hauv plag, txhua qhov chaw thiab txhua qhov chaw zoo heev, thiab cov roj hmab elasticity zoo. Kev thov. Yog li ntawd, lub plhaub ntim ntawm lub plhaub ntim ntawm sab laug thiab sab sab yog ib qho yooj yim kom muaj teebmeem thiab cov cwj mem thiab cov txheej dej dej raug xa tawm, thiab lub peev xwm tuaj yeem rov ua dua tus cwj mem thiab dej ntxiv thiab dej txo yog sai thiab meej raws li kev xav. Lub tshuab luam ntawv qub, thawj zaug ntawm txhua yam, cov roj hmab tawv, qhov rais, shrinks, thiab lub siab hloov unevenly. Txawm tias plaub lub tshuab luam ntawv tau luam tawm tsuas muaj ob qho hauv cov ntawv xov xwm xwb, thiab cov kev sib tw sab laug thiab tsis muaj teeb meem, tsis muaj teeb meem, ua rau lub zog, lub plhaub taum plawv yog qhov tseem ntxhib vim nws tsis zoo-muab pov tseg, nws yooj yim rov qab sau tsis zoo, tsis muaj xim txaus los ntxiv cov quav tooj quav ntxiv kom tau txaus tus lej, thiab tib lub sij hawm ua kom lub pob ciam tawm ntawm qhov sib npaug. Tib yam li thaum dej system nrog tsuas muaj ib phaj dej rau cov menyuam yaus loj dua, yog li niaj hnub no muaj ntau lub tshuab luam ntawv loj loj loj xa rov qab mus rau hauv cov qauv qub yav dhau los. Thawj tus cag quav rau tus kheej yog ib txoj kev tov dej thiab kua mem kua. Tsim kom muaj kev vam ntau dua thiab ua tau zoo hauv tus lej tus nqi. Yog li no, txhua peb los yog plaub lub hlis (tam sim no lub hnab roj hmab yog qhov ruaj khov dua ua ntej), cov dej hauv dej thiab lub khawm taub quav yuav tsum tau kho. Lub qhov saum npoo ntawm dej dej yuav tsum tau muab tshem tawm nrog ib qho tshuaj alkaline. Ib yam li ntawd, feem ntau ntawm tus cwj mem ntawm cov tub ntxhais feem ntau kho los ntawm mordant hauv tus cwj pwm, thiab cov pores yog tus du thiab du, thiab traction quab yuam ntawm lub nplhaib roj hmab suede thiab tus number case-pulling tus number case rau cov kos yog xiam, thiab tus number case-distributing thiab tus number case-txais peev xwm raug txo. Ntau tshaj, nyob ze rau ntawm cov dej uas muaj tus cwj pwm thawj zaug thiab zaum ob, thiab lub tshuab tsav sab qaum, yog cov nplaum ntim nrog colloid, nws yooj yim los ua qhov dej ntawm cov dej ntu thaum muaj dej ntau dhau. , ua rau tus number case muab tsis tshua muaj tsis ncaj. Feem ntau ntawm qhov teeb meem no tshwm sim nyob rau hauv cov taub dej. Yog tias cov quav ntim kua quav ntim rau cov ntu, tag nrho cov dej yuav tsum tau nce ntxiv kom tau txais cov dej nyob hauv tus ntiv tes xoo khi, uas yog, cov dej hauv qhov tsawg kawg nkaus thiab tsis tshua muaj dej seem tshooj tseem tsis muaj. Tsis txaus, nws yuav dawb ntawm qhov tshwm sim ntawm cov cim rau ntawm qhov teeb meem, tab sis thaum muaj dej ntau heev, ib txhia yuav tshaj 50% thiab 100%. Lub tawb quav number case muaj ib lub cwj mem xauv kom tswj tus nqi ntawm cov cwj mem ntawm ntu hauv seem. Ntawm qhov tsis sib thooj, cov dej rau cov dej tsis tam sim no muaj ib qho kev tswj khawm, thiab tsuas yog cov quav rau cov tub ntxhais plhaw yog cua txias rau cov dej haus ntawm cov dej ntawm cov quav hauv khov dua li dej ntau. Qhov nqi koj tshuav ntawm lub luag haujlwm. Yog li, lub siab ntawm tus cwj pwm ntawm cov quav thiab cov dej thiab cov roj hmab ntim lawv cov oleophilic, hydrophilic, thiab elastic, puag ncig, uas yuav cuam tshuam rau lub voj voog thiab txawm tias tag nrho cov nyiaj seem ntawm daim npav. Qee cov tshuab luam ntawv, tshwj xeeb tshaj yog cov neeg platen number roller, muaj cov iav los ntawm cov khau oscillating khau npog lawv tus kheej, tab sis vim tias cov zauv ntawm tus cwj mem zauv quav cwj mem zauv quav ntim rau hauv qhov chaw, tom qab ntev, yuav tsum tau ua rau tus cwj pwm xaj ntim qe Cov dej ntws ntim qeeb qeeb, tsis tuaj yeem ua raws li kev khiav ceev ntawm lub phom lub plhaub, ua rau "nres" tshwm sim thaum lub lag luam, uas tau ua rau qis streaks ntawm number case, uas yuav tsum tau qhib rau txo nws qeeb qeeb. Tsuas, yog li ntawd tseem muaj feem xyuam rau kev siv tus cwj pwm txuag-thiab-ntxuav, nws yog qhov tsim nyog los ntxuav cov tawv dub khov.
Nyob rau hauv qhov qub ntawm cov dej thiab cov tub ntxhais uas muaj lub tshuab luam ntawv, nws yog ib qho yooj yim los tham txog tus lej tshuav nyiaj li cas. Txwv tsis pub, qhov teeb meem tsis txaus ntseeg, tus lej rov ua dua yog nyob rau ntawm "tsis tshuav nyiaj npaum li cas". Tus neeg teb xov tooj yuav tsum them sai sai rau cov dej, tab sis tsis ntau dhau lawm. Cov pob ntaws tsis txaus ntawm qhov dej tsis tuaj yeem tshwm sim. Niaj hnub nim no CIP 3 / CIP 4, daim ntawv luam ua ntej lub cim ntawm cov ntawv luam tawm ntawm cov ntaub ntawv, tus thawj cov kua txiv hmab txiv ntoo, lub qub saj rau lub tshuab luam ntawv, yuav tsum muaj txheej ntau cov lej cim, luam ntawv chav kub thiab cov av noo, ntawv, luam ntawv siab Thiab cov neeg mob xav tau, hloov mus rau hauv cov xim ntawm txhua qhov xim, txhua lub cim tseem ceeb, hloov dua tshiab ntawm txhua lub tshuab luam ntawv, txhua lub tshuab luam ntawv, thiab txawm tias txhua lub tshuab luam ntawv, muab tso rau hauv computer software plug-in ntawm lub tshuab luam ntawv number case tswj lub cev kom hloov siab tshaj plaws. Tom qab luam ntawv, tus number case ntawm txhua tus number case hauv cheeb tsam yuav tsum muaj ib qho uas zoo ib yam thiab ruaj khov tsis ntev, thiab yuav tsis dhau. Tsis txaus, dua li tus tswv yav dhau los siv los siv kev pom qhov feem pua ntawm cov ntawv luam tawm ntawm lub phaj los kho tus number case yuam, muaj nws cov kev zoo thiab cov txiaj ntsig. Txawm li cas los, tus premise yog tias xoom rov qab thiab theem ntawm tus number case slot qhov tseem ceeb yuav tsum tau ua zoo heev. Txwv tsis pub, Gaoming Technology yog ua rau ntawm qhov pib ntawm qhov tsis sib xws, thiab nws yog ib qho yooj yim los pauv me me ntawm cov xaum xoom, tshwj xeeb tshaj yog 5 ~ 10% ntawm tus number case yuam. Cov teeb meem muaj peev xwm ua rau ntau cov ntaub ntawv los ua khib nyiab. Asmesliskas, qhov teeb meem loj ntawm tus cwj pwm ntawm tus ciav tus cwj pwm yog ntxim rau cov feem kaum ntawm tus cwj mem los ntawm tus cwj mem zis, ces qhov nruab nrab ntawm qhov pib ntawm tus number case key yog loj, thiab tus lej number case roller rotation yog tus me me; ntawm qhov tsis sib xws, qhov nruab nrab qhib qhov ntawm number case yuam yog me me; tus cwj mem kua ink Number Kev hloov ntawm cov cwj mem xaj yog tus loj, yog li qhov xoom-tsis muaj tseeb tshuab luam ntawv muaj qhov loj dua qhib khawm tus number case kom txo tau cov kev cuam tshuam ntawm tus nqi yuam kev. Nyob rau yav dhau los, tus number case kos yog muab faib raws li tus qauv sau, yog li ntawd cov khaubncaws sab nraud povtseg nyob rau hauv tshooj sab saum toj ntawm tus number case supply system sib txawv hauv cov inkness txheej txheem. Nws tseem yog ib qho tseem ceeb kom kho cov xim ua ntej tshooj tom ntej ntawm kev luam ntawv, txwv tsis pub nws yuav cuam tshuam rau xim hloov thaum lub sij hawm calibration. Vim li no, qee cov tshuab luam ntawv muaj kev ua haujlwm zoo. Thaum no daim ntawv luam tawm nrog 10 ~ 20 mantissas lawm, tus number case tank yuav raug kwv yees, xws li 10%, 15% ntawm nruab nrab ntawm cov xoom cim, cov khaubncaws sab nraud povtseg, tawm sab nrig qhov cwjpwm ntawm tus cuav uas siv rau tom ntej no. Yog hais tias tus lej ntawm tus cwj pwm muab luam tawm, tus cwj mem kua tsawg dua 15%. Nws tsis tsim nyog los ua kom ncaj nraim rau cov tsis muaj teeb meem ntawm cov xaj kua mis txheej saum toj no.
Txawv ntawm lub tshuab luam ntawv nplaum loj, muaj lub tshuab luam ntawv heev uas tsis tuaj yeem hloov tus number case thickness thiab flexo tshuab luam ntawv thiab Anilox Cov Menyuam Me Kab noj hniav. Kev faib tawm thiab qhov tob ntawm tus cwj pwm ntawm Anilox Cov Menyuam txiav txim siab qhov tuab ntawm tus number case plawg txheej ntawm qhov teeb tsa. Txuas ntxiv, letterpress luam ntawv thiab lithographic luam ntawv, ntawm qhov kev sib txawv ntawm tus number case tank thiab tus number case tank, tus number case ploj tawm ntawm cov ink txheej yog muab xa mus rau tsib mus rau xya zaus los tsim cov lej ntawm lub phaj luam, txheej yog inked. Cov ndlwg ntawm cov xaum xoos uas tsim los ntawm qhov tseem ceeb sib txawv rau qhov teeb tsa thiab qhov thickness ntawm tus number case txheej ntawm lub phaj luam nws tus kheej, ntxiv nrog rau qhov kev ceev ceev, thiab tsim kom muaj dej txaus. Seb nws yog ib qho tseem ceeb hauv kev tshuav ntawm luam tawm kua mis thiab ntxuav nrog xim huv thiab tsim nyog, thiab kev sib raug zoo ntawm cov ink number thiab txheej dej dej tsis tuaj yeem ua haujlwm tas li, tab sis kuj yog nyob ntawm qhov kev hloov xim thiab kub hloov ntawm cov number case supply system, thiab txawm Nws zoo tuaj nyob rau hauv rooj plaub uas muaj tus zauv lo av qhuav, tov nrog hmoov hmoov, thiab ntawv plaub hau. On the other hand, in the case of water supply, there are changes in the temperature of the evaporation water, the degree of contamination of the water roller, the pH value, and the water absorption of the printing paper, the humidity in the air, and how much the water vaporizes. Therefore, mainly because of the amount of ink supply, there are still many different factors that affect the change of ink and water balance.
5. The wet water runs there in the printing.
Most printers and printing company managers, although they are very careful in managing the inks bought by a large amount of banknotes, where they go, whether there is good color reproduction and printability, but they rarely pay attention to them. Use tap water to flow in tons of wet water and where to go. Water removal: (1) Paper absorption, which is different due to different materials. Smooth coated paper absorbs less water, snow paper is second, light coated paper is more, non-coated paper is quite large, and porous There is no glue on the tissue paper, news paper absorbs more, on the contrary synthetic paper, plastic, coated paper, foil almost does not absorb water. The same type of paper, the high humidity itself absorbs relatively little water, the low moisture absorbs more water, and the total amount of water absorbed by the paper increases in proportion to the printing speed (printing). (2) Evaporation is a very important part of water consumption. The evaporation of the printing plate is closed due to the flatness of the lithographic printing machine, which makes the proportion decrease a lot. Instead, it is the blanket and the pressure. The cylinder surface has a non-printing part with water. The part is the larger part of the evaporation of water, especially the double diameter and triple diameter pressure. When there is no paper size, it will cause a larger percentage of water evaporation. (3) Evaporation of emulsified water in the ink layer of the ink roller is also indirect water evaporation. In addition to the evaporation of the printing area, the evaporation of the printing area will not increase due to the faster printing speed. The evaporation itself is closely related to the air pressure, wind disturbance, temperature and humidity of the printing machine room, which also causes the major factors of the balance of ink and water. Usually, the temperature is high, and the moisture of the natural moist water in the water roller, the emulsified water of the ink roller, the layout and other parts that are not printed to the surface of the tube will increase evaporation. High humidity will reduce the amount of water evaporation in all parts of the whole. Today, due to the cooling of the ink roller, the freezing and temperature control mode of the water supply system, and the temperature control of the printing machine room, the temperature changes little throughout the year. On the other hand, the humidity factor is often the cause of the printing machine room that is not easy to detect and less noticeable, but it often affects the water balance of the printing press. Many people mistakenly think that the air-conditioner installed with cooling is air-conditioning. A single tool that reduces the temperature of the printing room, sometimes removing excess water from the air. Real air conditioners should have four functions of cooling, warming in winter, dehumidification and humidification. Therefore, the functions of dehumidifiers and humidifiers are very important in air conditioning. It is not only necessary to cool down the air, but also hopes that the air conditioner will be under the action. In order to remove excess water, the room temperature is only 13 ° C in winter and the relative humidity is 90%. This is also a difficult printing condition, and the paper will be stretched and deformed. Therefore, it is not advisable to use the air-conditioner to dehumidify. It should be combined with a cold-discharge dehumidifier. It is not only dehumidification but also the function of improving room temperature. It is a good method. In summer, the air-cooling function has the function of cooling and dehumidifying one stone and two birds, keeping the humidity of the printing machine room stable, increasing the balance of printing ink and ink and the stability of printing quality. If the printing room is in the summer thunderstorm or rainy season, use a five or sixty-ton air conditioner to cool down, you can see that the water in the air is like a third of the water in the tap, because the water in the outside atmosphere, and two or three The four-color printing machine, the evaporation of water is in the spectrum of five or six hundred liters per day, so one day air-conditioner, removing 800~1,000 liters of water is nothing special. It can be seen that the humidity of the printing room is 50~60. % is more suitable in Taiwan, but in winter it is more suitable for 45~55%. Too much water consumption for printing presses will increase a lot.
Some people think that the faster the printing press, the more the water supply will increase, and some people think that the scale of the water supply on the printing press should be reduced. It sounds very contradictory, but each has its own statement and basis, and there is no conflict. Basically, the faster the printing machine speed, the more the printing quantity, regardless of the emulsification of the ink, the absorption of the paper, the increase of the temperature of the printing machine, the increase of the heat disturbance, and the increase of the amount of water used for evaporation is a fact. On the other hand, the water on the surface of the printing plate and the printing paper does not increase, so the speed is increased and the water demand is increased, but there is no proportional increase. If the water roller takes one water per print, Or take two waters, then the faster the printing speed, the more water will be taken, the equivalent consumption is OK, but in the evaporation of the consumption, the excess water will be redundant. On the other hand, if continuous water supply is used, the water is always sent to the humid system. If the ink emulsified water, paper absorption water and heat disturbance increase more water, it is necessary to use the speed of the fast water tank to increase some water supply, otherwise the water supply There will be insufficient, and how this program is written has different opinions.
6. lithographic plates, some causes
Ink and wet water are the main characters in lithography, and they play a dynamic blending role and role. But let us not forget that the more important thing is the "print plate". This piece can distribute and absorb water, and at the same time, it can absorb ink in the "printing part" where it is to be printed. This is a very important platform for water and ink to balance performance. .
More than two hundred years ago, this platform was built on limestone in the Austrian Alps and the southern Alps of Germany. This milky white porous limestone plate has good water absorption. After accidentally dropping the candle, using a cloth with grease and water, when wiping, it was found that not only the wax was not wiped off, but the water and oil were separated from each other by the water and oil. It also promotes the principle of semi-physical and semi-chemical printing of non-printed and printed parts by lithographic printing in a single plane. Although there is a long time, there is also a very brilliant era of hand-painted color printing, hand-printed color lithography in Japan, Shanghai lithograph posters, and European and American lithograph posters, lithograph prints are still popular, but heavy stone plates can only be handmade and mechanical. Platform printing, can not enter the high-speed printing. In 1903, Mr. ZW Rubel of the United States invented the Zhangye lithography press, which is now indirect printing Offset, using a zinc metal lithography. The zinc lithographic material, its hydrophilicity and lipophilicity is almost in the middle, so the non-printed part of the printing plate is not very easy to get dirty, and the lipophilicity of the printed part is moderate, compared with copper. A lot worse. In addition, the zinc plate material is easily oxidized, and once it is oxidized, it becomes a non-hydrophilic and non-inking zinc oxide. This wall material, which is incompatible with printing, is placed on the non-printed portion to become a gray spot. In the printed part, the white spot on the imprinted part is full. Therefore, it is necessary to use more water to keep the non-printed part of the printing plate clean on the zinc plate. On the other hand, it is necessary to prevent the plate from being printed before the plate making. The zinc on the printing surface after plate making, printing, and preservation is oxidized. Zinc plate grain is thicker than aluminum and easy to wear, and it is also unfavorable for long-length printing. Now using aluminum plates, it has excellent effects in terms of hydrophilicity. In addition, although the grain grain (sand) is very fine, it is deep, and the water content is large, and the oxidation is formed under anodizing. Aluminum hardness is up to 9 degrees, higher than most gemstones, second only to diamonds, and the oxygen-polarized aluminum oxide layer has strong abrasion resistance, and more porous micro-structures, forming triple-type water-containing non-printing The pattern part, with less moist water, can make reasonable ink-and-wash balance printing, changing from zinc material to aluminum material as printing plate material, which is very helpful for lithography, easier to operate, not easy to get dirty, and aluminum is lighter than zinc. ntau heev.
In the early days of the PS version in the 1970s, 3M Company also introduced un-ground aluminum plates, which were difficult to control the plate moisture, so it was not successful. Another multi-layer version for lithography is also a highly successful plate that can withstand millions of sheets for packaging and metal printing. The outermost layer of the multi-layer version is a highly hydrophilic chrome metal, which is used as a non-printed part, and the bottom is copper (red copper) which has very good lipophilicity. There are three layers in the production, some are made of steel as the base, the surface is first plated with copper, then chrome plated, the plate is printed with a flat plate in the form of a flat plate, and then the chrome layer is etched in the unexposed part until the lipophilic The copper layer is barely exposed. In the future printing, the chrome layer can absorb moisture, and the printed copper layer can absorb oil, forming a full-metal stable and high-efficiency printing plate, and the abrasion resistance is three or fifty times that of the general drying plate. Materials such as zinc and aluminum. The full version of the double-layer version is made of chrome-plated copper, but the plate is not resistant to mechanical impact. Therefore, the steel is a practical three-layer version, but it has never been introduced in Taiwan. Because the plate cost is high, the printing volume is not big enough. Enough to use such plates.
Nowadays, the PS plate and CTP plate are the mainstream plates produced by lithography. In the early PS plate, there are many difficulties. For example, the acid and alkali values of the printing paper are not resistant to paper, too acid and too alkali will fall off, so the moist water should be done. The change is due to the fact that the paper coating layer and the pulp filler chemical dissolved from the printing paper surface will be traced from the moisture of the rubber blanket surface to the printing plate, the water roller and the water supply tank to form a chemical accumulation. The printing pattern is corroded and not durable, so thousands of sheets can not be used. Therefore, it is effective to make the printing glaze, or to replace the sink liquid, clean the wet system, and replace the printing paper. I remember that when I printed the classmates in the factory, I printed three or four sets (manually loaded) every hour, and printed three or five hundred sheets each time. I used the water roller to wet and dissolve the glue on the plate for half a day. The printing pattern is not inked, mainly because the wet water glue is too much and the acid is too strong, so that the ink of the ink supply system loses a lot of oiliness due to too much glue mixed, so the manual washing is used to remove the glue, and the ink roller is cleaned. Water roller, re-printing to work smoothly. If the tank liquid tank has not been used for a long time, it will often ferment and grow mold, which is not conducive to the role of moist water.
In the non-printed part of the plate, it is necessary to apply glue before printing, so that a thin layer of arabic acid glue is attached to it, and the long-term water absorption of the colloidal molecules is exerted. Therefore, it is called lithography that is not only incompatible with ink. In addition to the principle, there are also many principles of meta-chemical action.
7. Conclusion
An excellent lithographic press operator, today's technologically advanced era, although with many advanced precision machinery, motor to electronic equipment, under the control of many hardware and software, even the very difficult ink roller swing amplitude, pendulum phase, You can make fine-tuning change control on the console. Others such as the turning mechanism, the front and rear printing presses, the phase change of the cylinder and the jaws are opened and closed by the normal paper, and the twisting and turning back to the tail of the paper is extremely accurate. The complicated control work can be done by modern printing presses, not to mention the size of CIP 3 /CIP 4, ink key information reception and pre-adjustment. Therefore, Manroland changed the pad printing machine to press only one Start button, and all the projects were executed under the programmed system. But the advantage of our lithographic printing press, the use of thin low-cost aluminum, and high-precision 2400dpi, 3000dpi high-precision CTP platesetter, can make a plate from 500mm to 2860mm, both have good overprint precision, the plate from Enter to install fully automated.
The printing machine works for four or fifty years, and I want to find ways to develop the water film thickness of the wet water on the printing plate. According to the visual observation of the previous teacher, it is estimated that the amount of moisture on the non-printed surface of the printing plate is determined by the gloss of the side of the printing plate at an angle of about 10°, and it is easier to match the printed surface of the printed plate. Lose water in the block, do monitoring and add water. In this area, the prints are kept clean, and the total water supply is reduced. If the water is tested, the dry spots will appear immediately, indicating that the water supply has reached the critical point of the lower limit of the danger zone. It is not easy to raise the water supply higher. Produce defective products. The masters often have to change depending on the weather. At noon and afternoon, the temperature is high and the water is raining. When the wind blows over the window, the printing plate will dry up near the window, and quickly sprinkle water to make up the water, so these people's experience, Observing, in conjunction with the slower and slower production rhythm at the time, it is feasible to control the monochrome machine and the two-color machine, because these have a deep understanding of the ink and water balance characteristics of each environment and various blocks of the machine and the countermeasures are formed. A "work" that can be produced. Today, Zhang Yeping Printing Machine is not only four colors, six colors, even eight colors and ten colors. It is not only impossible to use manual inspection to visually check the water film of each printing plate on the tube, and the printing machine is now entering. In a small number of diverse production environments, it is not allowed to use manual observation of the water supply of various color plates. Instead, it is based on the speculation of workers, which is a large cover for high-priced, high-productivity flat printing machines worth tens of millions and hundreds of millions. The door is also a very ironic thing. The normal printed sheet was printed in the last minute. After 250 or 550 sheets in the next minute, it was a pile of waste prints that were too dry and too wet! This very drastic change does not exist in high-speed gravure and flexo press production. Therefore, using optical technology, infrared measuring instruments, microwave reflection and other technologies, I want to measure the research and development technology of the water film thickness of each block on the lithographic printing plate. Although there are so many high-tech measurement procedures, there is still no one today. , the work into practical control. Even with the Anilox Roller micro-acupressure ink supply roller, there is a more uniform ink supply layer printing method, but there is no successful control of the ink balance, but special ink must be used for normal printing. It can be seen that this difficult picture of ink and water balance is still based on the experience of high-tech lithographic printing presses. This is the operation of hundreds of thousands of printing presses. Every day, it is enough to do enough to operate the production. High-quality products, high-yield prints, this is a fact and a very helpless thing. Therefore, we should adjust the water supply, ink supply and roller elasticity, precision, pressure and surface condition of the printing machine, and then improve the ink and water conditions of the printing plate, and control the temperature and humidity of the printing machine room, ink and consumables. The quality management, coupled with the CIP 4 data, believes that under the helpless conditions, perhaps we still have to use lithography to continue printing for another 50 years, a hundred years is not necessarily, this ink and wash balance struggle history will continue to write Go on.