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Lub gloss ntawm cov ntaub ntawv luam tawm feem ntau yog tswj hwm los ntawm peb cov ntaub ntawv sib cuam tshuam: nto smoothness, ink absorption peev, thiab inherent ntawv gloss. Txhua yam ua rau muaj qhov txawv txav rau qhov kev ua tau zoo ntawm qhov kawg ntawm cov ntawv luam tawm -tshwj xeeb yog nws qhov kev xav tau zoo, pom qhov ci ntsa iab, thiab tonal fidelity.
1. Nto Smoothness
Nto smoothness quantifies lub℃ntawm micro-level planarity ntawm daim ntawv nto. Nws yog conventionally ntsuas siv lub Bekk smoothness tester: lub sij hawm (nyob rau hauv vib nas this, S) yuav tsum tau rau ib tug ruaj ntim ntawm huab cua kom dhau los ntawm qhov sib txawv ntawm ib tug standardized cheeb tsam ntawm daim ntawv thiab lub khob phaj nyob rau hauv kev tswj siab (100 kPa). Smoothness qhov tseem ceeb sib txawv ntawm cov ntawv qib: cov ntaub ntawv tsis muaj coated offset feem ntau qis dua 80 S (tsawg smoothness); 80-300 S txhais hais tias nruab nrab smoothness; thiab qhov tseem ceeb ntawm 300-600 S qhia tau hais tias siab smoothness. Cov ntaub ntawv coated ua lag luam feem ntau ua tiav 800 S lossis siab dua-piv txwv li, hauv tsev 150 g / m² ob npaug-ib sab coated ntawv nthuav tawm ~ 500 S, qhov sib npaug cov qhab nia txawv teb chaws tshaj 1000 S. Premium domestic kos duab- cov ntaub ntawv coated ncav cuag 1000 S.
Smoothness ncaj qha cuam tshuam nrog qhov chaw saum npoo: qhov smoothness ntau dua qhia txog qhov me me thiab zoo ib yam micro-pas (piv txwv li, ~ 2.5 μm rau 800-S coated ntawv), ua kom muaj kev sib cuag ntawm tus number case zaj duab xis thiab substrate. Qhov no txhawb nqa kev hloov pauv tus cwj mem zoo ib yam, muaj kev ncaj ncees halftone luam tawm, thiab tsim kom muaj ib qho txuas ntxiv, cov txheej txheem ntawm tus lej. Thaum illumination, xws li ib txheej yields pronounced specular ("mirror-zoo li") reflection{10}}pab kom pom gloss. Conversely, tsawg-cov ntaub ntawv smoothness nthuav tawm tsis tu ncua fiber ntau protrusions thiab heterogeneous pore lug, uas ua rau tsis sib xws ink zaj duab xis thickness, nce lub teeb tawg, thiab feem ntau diffuse reflection-yog li diminishing gloss.
2. Ink Absorption Peev Xwm
Ink absorption yog hais txog daim ntawv lub peev xwm los nqa lub tsheb (binder) cov khoom ntawm cov ntawv luam tawm - tswj hwm los ntawm porosity, fiber ntau morphology, thiab txheej txheej txheej. Rougher cov ntaub ntawv muaj cov inter- fiber ntau voids thiab ntau dua capillary kev ua, ua rau siab dua binder absorption. Txawm li cas los xij, kev nqus ntau dhau ua rau lub ntsej muag ci: kev nkag mus sai sai depletes lub binder los ntawm tus cwj mem zaj duab xis nto, ua rau cov xim xim kom mloog zoo ntawm qhov sib cuam tshuam thiab tawg qhov teeb meem teeb meem diffusely. Kev nqus tsis txaus, thaum ua kom lub ntsej muag zoo nkauj thiab ci ntsa iab, muaj kev pheej hmoo qeeb kom qhuav, teeb - tawm, plua plav, thiab crystallization vim tsis txaus binder anchorage.
Rau cov ntawv coated, ink absorption yog modulated los ntawm ob lub ntsiab txheej txheem:
(a) Binder-rau-pigment ratio: Ib qho piv txwv qis dua ua kom porosity thiab txhim khu kev nqus; conversely, ntau dua binder cov ntsiab lus densifies txheej txheej, txo kev nkag mus.
(b) Pigment particle loj: Cov khoom me me ua rau cov khoom ntim nruj dua thiab txo cov voids interstitial, txwv cov binder ingress; coarser pigments tsim qhov sib txawv loj dua, ua kom yooj yim nkag mus tob dua - thiab yog li txo qis gloss.
Kev ntsuam xyuas tus qauv siv tus cwj mem nqus nqus (ISO 5636-4): ib qho kev txiav txim kom muaj nuj nqis ntawm tus number case yog siv rau cov qauv; Tom qab lub sijhawm nyob ruaj khov (piv txwv li, 60 s), ntau tus number case raug tshem tawm nrog cov ntaub ntawv tsis muaj lint, thiab qhov seem ntawm tus number case yog xam los ntawm reflectometry. Lower reflectance qhov tseem ceeb sib haum mus rau kev nqus siab dua. Cov txiaj ntsig tau qhia raws li qhov ntsuas qhov nqus * A * (%), qhov twg * A *=(100 − * R *), thiab * R * yog qhov ntsuas qhov ntsuas (%).
3. Inherent Paper Gloss
Lub hauv paus gloss ntawm daim ntawv nws tus kheej-tshwj xeeb tshaj yog qhov tseem ceeb rau coated substrates- ua ib lub hauv paus txiav txim siab ntawm cov ntawv luam tawm kawg. Coated ntawv gloss tshwm sim los ntawm ob qho tib si formulation (xws li, suav nrog txhuas stearate, paraffin wax, los yog polyethylene dispersion raws li lub teeb-txhim kho cov neeg ua hauj lwm) thiab tiav cov txheej txheem - feem ntau tshwj xeeb tshaj yog supercalendering, uas imparts nanoscale nto uniformity los ntawm siab - compression steel - yob
Peb cov khoom no sib sau ua ke txhais cov ntawv ntawm * deg efficiency*- ib qho kev ntsuas sib xyaw uas qhia txog nws qhov tsim nyog rau siab -gloss printing:
Nto Efficiency=[(100 − *A*) + *G*] / 2
qhov twg *A*=ink absorption index (%), thiab *G*=gloss tus nqi ( ntsuas ntawm 75℃raws li ISO 8254-1, qhia hauv gloss units, GU). Raws li pom pom, cov ntaub ntawv coated tsis tu ncua ua haujlwm tsis zoo ntawm cov ntaub ntawv offset hauv qhov ua tau zoo; imported coated qib ntxiv tshaj qhov sib npaug hauv tsev vim qhov zoo tshaj txheej homogeneity thiab calendering precision.
High-cov ntaub ntawv ua tau zoo txo qis kev nkag mus rau hauv binder, tso cai rau oxidative curing thiab zaj duab xis- tsim cov txheej txheem los ua tus thawj- khaws cia cov kua nplaum zaj duab xis txuas ntxiv, txhim kho cov xim saturation, thiab ua kom pom qhov xav tau zoo tshaj plaws. Nyob rau hauv sib piv, tsawg-efficiency (siab-absorption) cov ntaub ntawv yuav tsum tau them nyiaj rau cov xovxwm hloov dua siab tshiab-xws li, nce number case laydown thiab impression siab- kom elevate khoom number case ceev. Cov kev ntsuas zoo li no, txawm li cas los xij, kev pheej hmoo ntawm lub suab compression, poob ntawm cov ntsiab lus tseem ceeb, thiab kev sib koom ua ke ntawm nruab nrab. Qhov tseem ceeb, plaub- xim ntub dej- ntawm- cov xovxwm ntub dej zam qhov nqus tau siab dua li ib zaug - xim, raws li kev tswj kev nkag mus rau thawj zaug txhim kho inter- xim adhesion-tshwj xeeb tshaj yog rau thawj zaug -}} kev txhawb nqa ntau dua .
Nyob rau hauv cov ntsiab lus, ua kom tau zoo gloss nyob rau hauv kev lag luam luam ntawv yuav tsum tau ceev faj xaiv ntawm daim ntawv nrog sib npaug, synergistic deg khoom -preoritizing siab smoothness, nruab nrab- mus rau - tsis tshua muaj number case absorption, thiab elevated inherent gloss- yog li ua kom muaj kev ntseeg ruaj khov ntawm cov duab kos duab, thiab kev tsim cov duab zoo nkauj, chromatic siv.
