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Qhov hnyav (feem ntau qhia hauv grams ib square meter, g / m²) qhia qhov loj ntawm ib tug -square- meter daim ntawv nyob rau hauv cov txheej txheem. Qhov kev ntsuas no yog qhov tseem ceeb rau cov ntawv tshwj xeeb, kev yuav khoom, thiab kev npaj tsim khoom.
Cov ntsiab lus tseem ceeb: Daim ntawv qhov ntev, nplooj suav, ntawv luam ntawv (lossis "daim ntawv" ua ib chav), thiab hom qauv.
Daim ntawv muab los ntawm cov mills feem ntau muaj nyob rau hauv ob daim ntawv tseem ceeb:
1. Yob Tshuag: Cov ntawv txuas txuas mus rau qhov loj - txoj kab uas hla, feem ntau hnyav ntau tons ib yob. Roll stock yog optimized rau siab -kev ceev rotary printing txheej txheem (xws li, ntawv xov xwm, lag luam web offset, thiab cov ntaub so ntswg ntau lawm). Nws qhov dav yog tus qauv thoob plaws ntau yam kev lag luam tshwj xeeb (xws li, 787 mm, 889 mm, lossis 1092 mm), thaum nws qhov ntev -txawm hais tias kev ua haujlwm tsis raug cai- tau txuas ntxiv los txhawb kev ua haujlwm tsis muaj kev cuam tshuam.
2. Txiav- daim ntawv Tshuag: Cov ntawv tiaj tus neeg siv feem ntau hauv cov ntawv luam tawm offset, digital, thiab me - hom ntawv luam tawm. Txheem txiav- daim ntawv loj muaj xws li:
• Qhov loj me: 787 mm × 1092 mm (keeb kwm raug xaiv raws li "tus qauv" tom qab kev saws me nyuam thoob plaws hauv phau ntawv thiab luam ntawv luam tawm);
• Loj loj: 889 mm × 1194 mm (qhov loj tshaj plaws tau txais loj- qauv qauv; lwm yam txawv xws li 880 mm × 1230 mm lossis 890 mm × 1240 mm kuj poob rau hauv pawg no, yog tias lawv tshaj qhov ntev ntawm cov pa).
"Format" yog hais txog tus naj npawb ntawm cov nplooj ntawv luam tawm tau los ntawm ib daim ntawv puv - loj tom qab tso thiab txiav. Ib daim ntawv puv -size- kuj tseem hu ua "cov ntawv qub" lossis "niam txiv ntawv"- ua lub hauv paus substrate. Thaum muab faib ua *n* sib npaug recto-verso nplooj ntawv units, nws yields ib *n*- nplooj hom (piv txwv li, 2- nplooj, 4-nplooj, 8-nplooj, 16-nplooj, thiab lwm yam). Feem ntau hom kev faib tawm muaj xws li portrait (txiav mus rau qhov luv luv), toj roob hauv pes (txiav mus rau lub ntug ntev), thiab tsis sib xws (tsis yog orthogonal lossis kev cai trimming).
"Cov ntawv luam tawm" yog ib qho tseem ceeb rau kev kwv yees cov khoom siv thiab kev suav nqi hauv kev luam ntawv offset. Nws sawv cev rau ib ob - ib sab impression ntawm ib daim ntawv lub cev -ie, ib daim ntawv=ib recto + ib verso. Yog li ntawd:
• Ib daim ntawv puv -size=ob daim ntawv luam tawm (vim nws haum rau ob qho kev ywj pheej ob npaug - sab impressions thaum nteg tawm);
• Ib *n*- nplooj ntawv hom sib raug rau 2/*n* cov ntawv luam tawm ib daim ntawv puv - loj. Piv txwv li:
- 4- nplooj ntawv hom → 0.5 luam ntawv ib daim ntawv loj;
- 8-nplooj ntawv hom → 0.25 luam ntawv;
- 16-nplooj ntawv hom → 0.125 luam ntawv;
- 32-nplooj ntawv hom → 0.0625 luam ntawv;
- 64-nplooj ntawv hom → 0.03125 luam ntawv.
Yog li, rau 100-nplooj ntawv luam tawm hauv 64-nplooj ntawv, cov ntawv luam ntawv yuav tsum suav rau ib daim ntawv yog:
100 nplooj ntawv ÷ 64 nplooj ntawv / hom ntawv=1.5625 hom ntawv × 2 nplooj ntawv / hom ÷ 2 (kom normalize rau ob -sib tshooj)=1.5625 × 0.03125 × 100? Kho kom raug: Ntau nruj:
Tag nrho cov ntawv luam tawm=(tag nrho nplooj ntawv) × (1 nplooj ntawv luam ntawv / 2 nplooj ntawv) ÷ (nplooj ib hom ntawv)=100 × 0.5 ÷ 64=0.78125 ntawv luam ntawv ib daim ntawv luam.
Txawm li cas los xij, muab cov lus pom zoo hauv kev lag luam kho "hom ntawv" raws li tus naj npawb ntawm * nplooj * ib daim ntawv puv, thiab txhua daim ntawv qhia tag nrho * n * / 2 ob npaug - kev xav, kev sib raug zoo yog:
Printing sheets per copy=(tag nrho nplooj) / (nplooj ib hom ntawv) × (1/2)=100 / 64 × 0.5=0.78125.
Rau 5,000 daim ntawv luam: 5,000 × 0.78125=3,906.25 cov ntawv luam ntawv. Kev suav nyiaj rau tus qauv 2% pov tseg: 3,906.25 × 1.02=3,984.375 cov ntawv luam ntawv. Hloov mus rau tag nrho - cov ntawv loj: 3,984.375 ÷ 2=1,992.1875 tag nrho- cov ntawv loj.
Chav tsev "ai" (tseem sau "ream" hauv qee thaj chaw hauv cheeb tsam, txawm hais tias txawv ntawm ISO ream ntawm 500 nplooj ntawv) yog ib txwm muaj East Asian daim ntawv ntau npaum li cas txhais tau tias * 500 puv -cov ntawv loj *. Qhov tseem ceeb, "tag nrho-size" yuav tsum sib haum rau cov niam txiv daim ntawv qhov ntev uas tau teev tseg rau cov ntawv muab qib thiab daim ntawv thov-tsis yog ib qho 500 nplooj ntawv xwb. Piv txwv li, tus kheej- nplaum daim ntawv qhia khoom ntawm 765 mm × 535 mm tsis ua ib daim ntawv puv -size daim ntawv nyob rau hauv cov ntsiab lus ntawm standard offset printing; Yog li, 500 cov nplooj ntawv sib npaug tsuas yog 0.5 ai. Siv qhov no rau qhov piv txwv saum toj no: tag nrho cov ntawv puv -size nplooj ntawv yuav tsum tau=1,992.1875; yog li ntawd, ai xav tau=1,992.1875 ÷ 500=3.984 ai (civ rau 4.0 ai nrog nyiaj pub rau pov tseg thiab tuav).
"Grammage" (qhov hnyav hnyav) suav cov ntawv loj hauv ib cheeb tsam (g / m²) thiab ncaj qha cuam tshuam nrog tuab, tawv, opacity, thiab printability. Cov neeg siv khoom niaj hnub qhia grammage nrog rau hom ntawv-piv txwv li: 60 g / m² uncoated woodfree ntawv rau kev sau ntawv; 80 g / m² ob -coated art daim ntawv rau daim ntawv qhia; 200 g / m² coated ntawv rau cov ntawv tshaj tawm; los yog 250 g / m² grey- rov qab dawb board rau ntim. Nyob rau hauv txhua pawg ntawv, grammage variations ho cuam tshuam rau cov neeg kho tshuab tus cwj pwm, ink absorption, thiab ua tiav kom haum- ua kom meej grammage xaiv qhov tseem ceeb rau kev ua haujlwm zoo thiab zoo nkauj.
