Yuav ua li cas yog tus cwj mem xim ntawm Offset Printing yog Uniform thiab tsis sib xws

Offset ntim khoom feem ntau muaj thaj tsam loj ntawm cov xim tom qab, xav tau cov xim tuab, xim xim. Qhov sib xws ntawm tus cwj mem xim muaj ob yam: ib qho yog hais txog qhov sib xws ntawm tus cwj mem xim ntawm cov ntawv luam tawm sib txawv; Qhov thib ob yog hais txog qhov sib xws ntawm tus cwj mem xim ntawm qhov sib txawv ntawm tib daim ntawv luam tawm. Ntawm lawv, tus cwj mem xim sib xws yuav tsum muaj rau qhov sib txawv ntawm tib daim ntawv luam tawm yog nruj tshwj xeeb, uas yog qhov tseem ceeb rau kev ntsuas cov khoom zoo. Offset luam ntawv number case txheej yog nyias, ua rau muaj teeb meem xws li streaks, smeared rov qab, tsaus rau pem hauv ntej thiab nraub qaum, thiab nws tsis yooj yim kom ua tiav cov xim tuab thiab xim xim thaum luam ntawv loj.

Yog tias koj xav siv cov txheej txheem luam ntawv offset los luam ib cheeb tsam loj ntawm cov xim tom qab, ntawm ib sab, koj xav tau lub tshuab luam ntawv siab, ntawm qhov tod tes, koj yuav tsum tau txais cov txheej txheem tsim nyog.

 

1. Sim zam cov kab nyias nyias hauv qhov chaw xim tom qab

Lub thickness ntawm tus number case txheej xim luam ntawv tsis haum rau luam ntawv loj-thaj chaw tom qab xim, tshwj xeeb tshaj yog thaum lub npoo ntawm substrate tsis du txaus, nws yuav ua rau tib neeg xav tias tus number case tsis tuab txaus thiab tsis sib xws.

Spot xim khoom tom qab luam ntawv feem ntau yuav tsum tau nce tus naj npawb ntawm cov khoom. Lub thicker number case nyob rau hauv layout yuav inevitably nce qhov tshwm sim ntawm number case txuas mus rau qhov seem dawb paug. Yog li ntawd, thaum tsim qauv ua ntej luam ntawv, sim zam cov xim zoo nkauj hauv cov xim tom qab. Yog tias muaj cov cim me me, sim siv boldface, vim tias cov cwj nrag ntawm boldface yog cov tuab thiab tsis yooj yim rau paste.

Qhov thib ob, Cov nyhuv xim tom qab ntawm qhov thib ob overprint yog qhov zoo dua

Yog tias muaj ob qho tib si dub tom qab thiab xim halftone dluab ntawm ib qho kev teeb tsa, ces yuav tsum muaj ob qho tib si loj ntawm cov khoom thiab cov duab ib nrab ntawm cov phaj dub, uas txiav txim siab tias tus number case dub tsis tuaj yeem luam tawm tuab heev. Nyob rau hauv cov ntaub ntawv ntawm tsis tshwj xeeb ua ib tug dub keeb kwm yav dhau xim phaj, nyob rau hauv thiaj li yuav ua tau ib tug thicker pom nyhuv ntawm cov xim tom qab xim dub, li 40 feem pua ​​ntawm lub tiaj tiaj screen yuav muab ntxiv rau cov coj ib feem ntawm lub keeb kwm yav dhau dub xim ntawm cyan phaj. , vim tias tus cwj mem dub yog overprinted ntawm cov xim cyan. Lub tiaj tus npo tseem yog xim dub, thiab qhov tshwm sim yog tias cov xim number case thickens. Nrog rau txoj kev no, cov nyhuv tuab txaus tuaj yeem ua tiav thaum tus number case dub tsis luam tawm tuab heev.

Ntxiv nrog rau cov duab xim ntawm cov qauv ntawm qee cov khoom, qee qhov chaw sib sib zog nqus xim keeb kwm yav dhau, xws li cov xim liab qab, xim xiav tsaus, thiab lwm yam, yuav tsum tau luam tawm. Lub sijhawm no, cov ntawv luam ntawv tiaj tus tuaj yeem muab ntxiv rau qhov sib thooj ntawm cov xim tom qab ntawm ib lub phaj xim. Ua ib qho primer, thiab tom qab ntawd muab cov xim xim rau nws.

Qhov kom zoo dua ntawm overprinting thaj tsam loj ntawm cov xim tom qab los ntawm ob qho kev luam ntawv yog: ntawm ib sab tes, nyob rau hauv cov xwm txheej ntawm kev tswj cov thickness ntawm tus number case txheej tom qab xim phaj, lub overprinted number case txheej yog thicker; ntawm qhov tod tes, nws tuaj yeem txo cov cwj mem ntawm daim tawv nqaij thiab ntawv hmoov zoo heev. , Streaks thiab lwm yam kev cuam tshuam tsis zoo ntawm lub vijtsam luam tawm.

3. Cov kev sau ntawv zoo li ua tau rau tus cwj mem

Sim kom tsis txhob nkim lub teeb skylights raws li cov kev taw qhia ntawm lub nruas rotation nyob rau hauv nruab nrab ntawm cov khoom. Txij li thaum tus number case muaj peev xwm ntawm cov xovxwm luam ntawv yog txwv, lub elongated skylight raws li kev sib hloov ntawm lub tshuab luam ntawv lub tog raj kheej yuav ua rau cov number case nyob rau sab sauv thiab qis kawg ntawm lub skylight thaum luam ntawv, uas yuav cuam tshuam rau cov duab ntawm daim duab. Yog hais tias lub skylight tsis nyob rau hauv cov duab ntawm cov khoom tiav, txiav txim siab ntxiv nws rau tib yam khoom hauv av ib puag ncig, lossis yog tias ua tau, tig tag nrho cov qauv 90 degrees. Thaum ua cov ntawv luam ntawv rau cov khoom ntim, vim tias ntau cov qauv feem ntau hla ua ke, feem ntau muaj qhov khoob khoob khoob khoob khoob khoob uas lawv tau ntsib. Xws li cov khoom seem yuav tsum tau ntim nrog tib lub hauv av zoo ib yam li ib puag ncig. Txawm hais tias qee tus cwj mem yog nkim, nws yog qhov tsim nyog rau cov xim xim xim.

Plaub, luam ntawv yog qhov tseem ceeb tshaj plaws

Lub siab precision ntawm lub tshuab luam ntawv yog qhov yuav tsum tau ua ua ntej rau kev luam ntawv loj ntawm cov xim tom qab. Yog tias cov xim tsis zoo tom qab tuaj yeem luam tawm nrog lub siab qis dua, nws qhia tau tias cov xovxwm offset muaj qhov siab dua. Kev ua haujlwm raug ntawm cov menyuam bearings, kis tau tus mob, thiab lwm yam thiab kev ntseeg siab ntawm lub clutch siab mechanism thiab number case tis mechanism yog qhov tseem ceeb tshwj xeeb.

 

1. Kev luam ntawv siab

Kev luam ntawv loj dua thaum luam ntawv rau hauv av, ntawm ib sab, yog qhov tsim nyog rau kev sib cuag ntawm lub tshuab luam ntawv kom tau txais cov ntawv tuab thiab tuab; Ntawm qhov tod tes, nws tuaj yeem txhawb kev nkag siab ntawm tus cwj mem ntawm daim ntawv, thiab ua kom nrawm kho thiab ziab ntawm tus number case.

 

2. Kev ruaj ntseg ntawm kev luam ntawv siab

Thaum lub sij hawm dov txheej txheem ntawm luam ntawv phaj lub tog raj kheej thiab daim pam lub tog raj kheej, daim pam lub tog raj kheej thiab lub tog raj kheej lub tswv yim, yog tias lub tshuab luam ntawv hloov pauv, nws yuav ua rau muaj kev hloov pauv ntawm tus number case hloov pauv, thiab nws thiaj li ua rau cov xim tsis sib xws hauv av.

 

3. Lub elasticity ntawm daim pam

Tom qab siv mus ntev, daim pam yuav maj mam muaj hnub nyoog, thiab tus number case rau ntawm daim pam yuav tsis nyob rau hauv tag nrho kev sib cuag nrog rau saum npoo ntawm daim ntawv, ua rau tsis zoo number case hloov mus rau qhov tseeb unevenness thiab thickness.

Tsis tas li ntawd, qhov nruj ntawm daim pam yog, ntau cov roj hmab txheej ua thinner thiab qhov hnyav dua qhov poob ntawm elasticity. Rau huab cua cushion pam vov, cov huab cua cushion txheej tej zaum yuav txawm ua tsis tiav, uas tsis tsim nyog kom tau txais cov xim xim xim.

 

4. Cov menyuam hauv ob sab phlu

Kev ua tsis zoo ntawm lub tshuab luam ntawv phaj lub tog raj kheej thiab daim pam lub tog raj kheej yuav ua rau cov zawv zawg loj rau ntawm qhov chaw luam ntawv, thiab qhov zawv zawg ntawm cov ntawv luam ntawv phaj nto tsis sib xws, ua rau tus number case streaks thiab cuam tshuam rau qhov sib xws ntawm cov khoom number case txheej.

 

5. Cov ntawv luam tawm

Rau cov nplooj ntawv puv, cov ntawv luam ntawv yuav tsum tau luam tawm raws li niaj zaus, tab sis cov ntawv luam ntawv qub tseem tuaj yeem siv rau cov nplooj ntawv puv, uas tuaj yeem txuag cov nqi tsim khoom thiab txhim kho kev ua haujlwm. Txawm li cas los xij, cov photosensitive resin nyob rau hauv daim duab ntawm PS phaj thiab alumina nyob rau hauv qhov dawb paug muaj me ntsis txawv ink nqus nqus thiab hloov peev xwm. Cov txheej number case rau ntawm cov khoom luam tawm sib raug rau cov duab ntawm cov ntawv luam ntawv qub yuav yog qhov khoob dua li cov ntawv luam ntawv qub. Ib feem ntawm cov txheej txheem number case yog me ntsis darker. Rau kev luam ntawv muaj xim zoo nkauj, xws li xiav tsaus, nws yog qhov zoo tshaj plaws los siv lub phaj luam ntawv dawb huv, lossis rau nruab cov ntawv luam ntawv qub nyob rau hauv thim rov qab (pem hauv ntej lub ntsej muag, rov qab lub ntsej muag tawm) rau luam ntawv; luam ntawv cov xim tsis muaj zog, xws li daj thiab ci roj, vim tias nws yog ib qho nyuaj rau tib neeg lub qhov muag kom paub qhov txawv me me, thiab cov ntawv luam ntawv qub tau tso tseg tom qab luam ntawv kawg tuaj yeem siv ncaj qha.

 

6. Kev sib xyaw ntawm tus cwj mem

Lub fluidity ntawm tus number case siv nyob rau hauv lub tshuab luam ntawv yog me ntsis loj dua li ntawm cov duab halftone. Yog tias tus number case fluidity tsawg dhau, nws tsis yooj yim rau kis tusyees ntawm tus number case rollers, uas tuaj yeem ua rau cov xim number case tsaus rau pem hauv ntej thiab lub teeb nyob rau hauv qab. Lub fluidity yog ntau dua. Tom qab tus number case tau luam tawm ntawm daim ntawv, nws tuaj yeem hloov tau sai sai ua ntej ziab, uas yog qhov zoo rau kev ua kom cov khoom ntim tau zoo thiab ua tiav cov txiaj ntsig ntawm tus cwj mem thiab tuab. Qhov phem tshaj ntawm daim ntawv, qhov ntau nws yog tsim nyog los txhim kho lub fluidity ntawm tus number case thaum luam ntawv rau hauv av.

Lub fluidity hloov ntawm tus number case yog tsuas yog los kho cov viscosity ntawm tus number case. Feem ntau ntxiv cov viscosity tsawg 6 cov kua roj vanish kom dilute tus number case, tab sis tus nqi yuav tsum tau tswj nruj me ntsis, vim tias cov viscosity tsawg dhau thiab tus number case yog yooj yim rau emulsify.

Thaum luam ntawv coated ntawv, txhawm rau tiv thaiv smearing ntawm sab nraub qaum, me me ntawm desiccant lossis detackifier yuav tsum tau ntxiv rau tus number case.

 

7. Ink transferability ntawm tus number case roller

Tus cwj mem rau cov menyuam yuav ua kom du vim kev laus lossis kev tu tsis raug, thiab nws lub peev xwm nqus thiab hloov tus cwj mem yuav tsis muaj zog. Tshwj xeeb tshaj yog cov inking roller, yog tias nws tsis tuaj yeem nqus tau tus number case txaus, thaum nws thawj zaug hloov tus number case tom qab nws los rau hauv kev sib cuag nrog cov duab thiab cov ntawv ntawm cov ntawv luam ntawv, vim tias qhov me me ntawm tus number case cia, lub suab tsaus thiab cov khoom hauv av. Daim duab ntawm lub phaj luam ntawv tau nqus tus number case rau ntawm nws qhov chaw Feem ntau ntawm cov number case rollers tsis tuaj yeem tau txais tus number case txaus tam sim ntawd los ntxiv rau lawv. Yog li ntawd, thaum tus number case yog pauv mus rau qhov thib ob hloov, tus number case tau los ntawm qhov tsaus ntuj ntawm daim duab lossis qhov chaw ntawm cov khoom yog ntau tsawg dua li qhov kev hloov pauv thawj zaug. Txawm hais tias muaj 4 inking rollers los hloov tus number case, cov xim number case tseem tshwm tsaus rau pem hauv ntej thiab lub teeb nyob rau tom qab. Yog li ntawd, lub inking rollers, tshwj xeeb tshaj yog thawj ob inking rollers, yuav tsum tau siv cov roj hmab cov menyuam nrog zoo deg number case hloov kev ua tau zoo.

 

8. Kev hloov siab ntawm tus number case roller

Lub siab ntawm tus number case roller thiab tus number case roller, nruab nrab ntawm tus number case roller thiab daim ntawv luam ntawv yuav tsum tau kho kom haum. Yog tias qhov siab me dhau lawm, tus cwj mem hloov pauv yuav tsis zoo, tshwj xeeb tshaj yog tias qhov sib tiv tauj ntawm tus number case daim ntawv rau cov menyuam thiab tus number case hlua cov menyuam yog lub teeb dhau, yog li tus number case daim ntawv cov menyuam tsis tuaj yeem tau txais tus number case txaus, cov xim number case ntawm cov txheej txheem. yuav lub teeb thiab hnyav. Ua kom muaj kev laus ntawm tus number case rau cov menyuam, tshwj xeeb tshaj yog tias lub siab ntawm tus number case daim ntawv rau cov menyuam thiab cov ntawv luam ntawv loj dhau lawm, nws yuav ua rau poob siab ntawm lub gripper, thiab cov number case streaks yuav tshwm sim. Lub siab ntawm tib lub inking roller thiab inking roller yog me ntsis tsawg dua nws qhov kev sib cuag nrog lub phaj luam ntawv. Qhov no yog los xyuas kom meej tias cov kab khiav ceev ntawm cov menyuam inking tsis sib haum nrog cov kab nrawm nrawm ntawm cov ntawv luam ntawv kom paub meej tias cov menyuam inking tuaj yeem ua raws li qhov siab. Sab ntawm lub phaj luam ntawv, uas yog, sab ntawm lub phaj luam ntawv, khiav synchronously, thiaj li hais tias tus number case daim ntawv rau cov menyuam thiab qhov chaw ntawm lub phaj luam ntawv yog dawb li sai tau.

 

9. Kev hloov siab ntawm cov menyuam dej

Yog hais tias lub siab ntawm cov dej rau cov menyuam thiab cov menyuam cov dej, nruab nrab ntawm cov menyuam cov dej thiab cov ntawv luam ntawv me dhau los yog loj dhau, nws yuav ua rau cov dej tsis zoo thiab ua rau cov phaj ntog qias neeg. Lub siab ntau dhau ntawm cov dampening cov menyuam thiab cov ntawv luam ntawv, thiab ntau dhau ntawm cov dampening cov menyuam thiab cov hlua hlua, tuaj yeem ua rau cov kab dawb.

 

10. Kev hloov ntawm tus number case roller

Yuav kom ua tiav qhov zoo tshaj plaws number case faib cov nyhuv, axial string momentum ntawm stringing roller feem ntau yog nyob rau ntawm txoj hauj lwm ntawm txoj hlua siab tshaj plaws. Nyob rau hauv txoj hauj lwm no kuj tseem yuav pab tau rau tus neeg teb xov tooj kom kho cov axial number case ntim ntawm qhov sib npaug. Hauv qee lub tshuab luam ntawv, cov tshuab luam ntawv tuaj yeem txav mus rau hauv series tom qab hloov kho. Txhawm rau kom ua tiav cov txiaj ntsig zoo ntawm tus number case, lub inking roller tuaj yeem txav mus rau qhov tsim nyog. Los ntawm kev kho qhov pib ntawm txoj hlua txav ntawm txoj hlua rau cov menyuam, lub voj voog ncig ntawm tus cwj mem tuaj yeem hloov pauv. Nws yog ib qho nyuaj rau kev txiav txim siab txoj haujlwm twg yuav tsum yog qhov pib zoo tshaj plaws. Feem ntau, ib tus tsuas tuaj yeem txiav txim siab txog txoj haujlwm uas tsim nyog rau cov xim xim xim los ntawm maj mam kho txoj hlua pib txoj haujlwm.

 

11. Tswj kev cuam tshuam ntawm emulsification ntawm tus cwj mem xim

Thaum luam ntawv cov xim tom qab, cov emulsification siv dej ntau thiab cov khoom siv dej loj. Lub axial kawg ntawm cov khoom xim tom qab xim, tshwj xeeb tshaj yog thaum cov xim tom qab los ze rau ntawm daim ntawv, tsis muaj tus cwj mem thiab dej emulsification nyob rau hauv cheeb tsam sab nraum daim ntawv, thiab tsis muaj ib feem ntawm daim ntawv absorbs dej. Raws li qhov tshwm sim, cov dej ntau dhau yuav ua raws Txoj hlua ntawm cov menyuam dej nkag mus rau tom qab xim qhov chaw ntawm ob qhov kawg ntawm daim ntawv axis, ua rau cov xim xim xim xim txheej tom qab ntawm ob qho kawg ntawm daim ntawv kom overemulsified, cov xim number case yuav sib dua, thiab sab nraub qaum smear phenomenon yuav tshwm sim. Ib txoj hauv kev tsim nyog yog siv cov tshuab tshuab dej kom ntau li ntau tau, lossis siv cov ntawv nplaum rau ntawm lub thoob dej rau cov menyuam kom txo tau cov dej ntawm ob qho kawg ntawm cov ntawv luam ntawv hauv axial kev taw qhia, thiab tswj cov qib emulsification ntawm tag nrho nplooj ntawv.