Kev ua yeeb yam thiab kev siv cov ntawv xov xwm
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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Lus cim tseem ceeb yog ib daim ntawv tshwj xeeb rau cov ntawv xov xwm luam ntawv, feem ntau hu ua ntawv dawb. Nws yog tsuas yog siv rau cov ntawv xov xwm, periodicals thiab loj-luam luam ntawm general-lub hom phiaj nyob rau hauv letterpress luam ntawv. Vim tias nws rov tuaj rau hauv ib lub cylindrical tom qab tau muab theej, nws yog siv los ua haujlwm luam ntawv, uas ua kom zoo tshaj plaws rau kev luam ntawv.
Cov dlej ntawm cov ntawv xov xwm tseem ceeb tshaj plaws txog kev ua pleev zoo nkauj, kwv yees li 90%, thiab li 10% ntawm bleached tshuaj ntoo pulp, tab sis, yog cov ntoo tsis zoo, cov khoom noj khoom haus, pulp, tshuaj pleev hmoov, thiab lwm yam yog siv ntawm txhua yam khoom siv ntoo pulp. Vim muaj ntau cov khoom siv hlau pleev siv rau hauv ntawv xov, cov ntsiab lus ntawm impurities loj loj, cov pulp muaj ntau cov luv fibers, thiab ntau lwm qhov tsis muaj teeb meem impurity puav leej muaj kev sib raug zoo rau cov fibers, ua cov ntawv xov xwm zoo li tsis tshua muaj whiteness. Nrog rau kev txhim kho kev siv cov tshuab papermaking niaj hnub no, pov tseg cov ntaub ntawv siv rau kev siv cov khoom siv rov ua dua, thiab cov tshuaj xws li hauv cov ntawv luam tawm hauv cov ntawv pov tseg yog tshem tawm thiab tshem tawm ntawm cov cuab yeej siv high technology, thiab cov ntawv xov xwm thib ob xa rov qab. Cov suab paj nruag no yuav raug muab ntxiv dua. Kev luam ntawm ntawv xov xwm tuaj yeem txo tus nqi ntawm raw cov ntaub ntawv thiab rov qab siv cov ntaub ntawv. Kev tsim cov ntawv xov xwm yog tsim los ntawm kev nias thiab ntau ziab twj ywm, uas nias los ntawm cov khoom qub. Vim yog lub txheej txheem ntawm cov ntawv xov xwm ntawm cov ntawv xov xwm thiab cov yam ntxwv ntawm cov khoom ntiag tug, nws tau txiav txim siab tias cov khoom tiav thiab nws cov kev siv tau muaj kev txwv tshwj xeeb.
Ib tug. Tus qauv thiab kev txuam ntawm cov ntawv ceeb toom
Cov ntawv xov xwm yog ib qho kev txeem ntawm cov nroj tsuag fibers, fillers, cov tebchaw thiab cov xim. Cov tsob nroj cog yog tsim los ntawm cellulose, hemicellulose, lignin, thiab lwm yam., Thiab cov qauv ntawv yog ib qhov dej porous txaij. Tus qauv pore yog lub hauv paus ntawm daim ntawv. Ntxiv ntawm daim ntawv fibers
Kev sau rau hauv cov ntaub so lub cev hloov pauv ntawm lub cev.
Cellulose yog ib qho polysaccharide ntuj polymer compound uas muaj peb hom carbon, hydrogen thiab oxygen. Cellulose yog hom tshuaj hydrophilic nrog cov khoom siv tshuaj lom neeg ruaj khov. Nws yog cov dej tsis zoo thiab cov dej tsis xyaw ua kua nruab deg.
Hemicellulose yog ib tug carbohydrate uas muaj qee cov monosaccharides uas tau nrog los ntawm cov cellulose hauv cell phab ntsa ntawm cov nroj tsuag. Nws muaj ceg ntoo, ib qho me me ntawm polymerization, zoo hydrophilicity thiab adsorption, nws yog cov dej tsis zoo, tab sis nws yooj yim heev nqus dej thiab swell.
Lignin yog ib qho kev tsim los ntawm phenylpropane monomer uas muaj cov yam ntxwv uas muaj ntxhiab. Cov tshuaj lom neeg no tsis ruaj tsis khov. Nyob rau hauv qhov kev txiav txim ntawm lub hnub ci thiab huab cua, daim ntawv zoo nkauj yuav txhav, lub zog ntawm txhua yam yuav ua kom tsawg, daim ntawv xim yuav tsaus, thiab cov lignin yuav yellowish xim av.
Lub whiteness ntawm daim ntawv, thiab lwm yam.
Nyob rau hauv daim ntawv ntawm fiber ntau, vim qhov kev txiav txim ntawm cov hydroxyl pawg thiab sib sib zog ua ke ntawm cov fibers, interlaced mus rau ib lub network ntawm qhov pores, ua ntawv rau ib hom tshuaj muaj zog hydrophilic, uas tsuas adsorbs dej thiab yog insoluble hauv dej, thiab los ntawm fiber Ntau cov nyhuv hydrolytic ua rau koom haum koom nrog hydrogen, uas ua rau lub cev muaj zog ntawm cov ntaub ntawv.
Muab cov zauv rau daim ntawv txhais tau tias muab ntxiv rau cov qoob me ntsis rau cov zaub mov rau daim ntawv hloov qhov opacity, whiteness thiab smoothness ntawm daim ntawv deg.
Ua ntawv thov txhais tau tias ntxiv cov roj hmab khoom rau daim ntawv yuav ua rau cov ntawv muaj cov dej tsis haum thiab dej tsis kam, tiv thaiv kev nkag mus ntawm cov dej noo, thiab ua kom lub zog ntawm daim ntawv zoo tuaj. Lub sizing faib rau ob hom: internal sizing thiab paper sizing.
Qhov xim tha yog hais txog cov khoom ntxiv rau cov tshuaj dawb ntawm lub pulp. Nyob rau hauv newsprint benzene, cov khoom xiav-ntshav liab feem ntau ntxiv rau bleached pulp.
Ob. Web yam ntxwv
Xov xwm ntawv tseem yog ib daim ntawv luam tawm. Yog li ntawd, nws thawj zaug muaj qhov ntau ntawm daim ntawv. Nyob rau tib lub sij hawm, nws yog tsuas yog siv rau cov ntawv xov xwm thiab lwm cov ntawv luam nrog lub sij hawm luv luv, yog li nws muaj nws tus kheej cwm pwm.
1. Muaj tus cwj pwm tsis txaus siab. Txij li thaum cov ntawv xov xwm tawm xov xwm tsis tu ncua luam tawm hauv qab ntawm kev siv lub tshuab ua haujlwm siab, thiab cov cwj mem kua adhesion nyhuv zoo nyob rau hauv ib lub sij hawm luv luv, tus lej cim ntiag tug muaj zog. Nyob rau hauv kev tshaj tawm xov xwm, nws zoo tshaj tus number case absorbing nyhuv yog 1/3 ntawm thickness ntawm daim ntawv. Tsis tas li ntawd, cov ntawv xov xwm tshwj xeeb tshaj tawm txog kev tswj cov ntoo ntawm cov ntoo, cov tshuaj ntoo ntoo thiab cov khoom siv thaum lub caij npuaj npaug. Qhov kev faib khoom ntawm cov khoom nyoos ncaj qha mus cuam tshuam tus number case absorption ntawm newsprint.
2. Daim ntawv yog mos, muaj qhov sib txawv ntawm cov void, thiab muaj kev ywj pheej zoo thiab elasticity. Txij li cov ntawv xov xwm siv rau hauv cov zauv ntawm cov khoom lag luam ntau ntawm cov hmoov ntoo thiab cov quav cab, cov ntsiab lus ntawm impurities loj, kom daim ntawv fibers muaj muag, cov fibers uas muaj cov fillers, thiab ntau ntawv ntoo tshauv yog feem ntau tam sim no thaum luam ntawv. Cov dej ua haujlwm tsis zoo, tus neeg muab cov ntaub ntawv raug muab tso rau hauv qhov sib txawv ntawm qhov sib txawv ntawm fiber ntau, thiab cov void nto loj heev, thiab tib lub sijhawm, kom los siav zoo dua tus cwj pwm absorption, cov ntawv xov xwm muaj compressibility thiab elasticity, thiab daim ntawv yog nyob rau hauv kev kub ceev. Tom qab daim ntawv nias los ntawm daim pam, qhov zoo dua qhov ua kom pom thiab qhov ywj pheej yuav daws tau qhov yoo mov ntawm tus cwj mem, thiab ua kom zoo thiab kev hloov cov duab thiab cov ntawv.
3. Lub pob dawb ntawm cov ntawv yog tsawg, cov opacity siab, fiber ntau interlacing zog yog tsawg, thiab lub zog txhua yam ntawm daim ntawv tsis siab. Cov ntawv xov xwm muaj ib qho loj ntawm cov ntoo phom suab paj nruag, ntoo pulp muaj ntau lignin, lignin yooj yim heev rau oxidize thiab discolor hauv huab cua, feem ntau zoo newsprint, nws whiteness yog li 60 degrees. Lub opacity nyob ntawm lub teeb scattering muaj peev xwm ntawm daim ntawv, tus nqi ntawm lub teeb scattering interface hauv daim ntawv, thiab qhov txawv ntawm refractive Performance index ntawm lub scattering interface. Ntau qhov tawg nti, qhov loj dua qhov kev ntsuas qis ntawm kev txhim kho qhov nruab nrab, qhov siab tshaj qhov tsis muaj zog. Hauv cov txheej txheem ntawm papermaking, vim ntawm qhov sib ntxiv ntawm cov fais fab, qhov sib txawv ntawm cov fibers yog sau nrog tus neeg muab khoom ua kom nce ntu nruab nrab ntawm lub teeb, thiab qhov tawg ntawm cov zauv thiab cov huab cua loj loj, yog li ua qhov siab ntawm cov ntawv ceeb toom. Cov ntawv xov xwm siv cov khoom ntoo loj heev. Nyob rau hauv tus txheej txheem ntawm pulping, lub fiber yog luv luv thiab tuab, thiab cov ntsiab lus ntawm impurities loj. Qhov kev sib txuas lus thiab kev sib txuas lus ntawm cov fibers yuav tsis tshua txo qis, thiab lub zog ntawm txhua yam yuav ua rau kom haum.
Peb, qhov xwm ntawm cov ntawv xov xwm
Qhov xwm ntawm kev tshaj tawm xov xwm feem ntau yog hais txog nws qhov kev tsim nyog rau kev luam ntawv, nrog rau qee yam ntawm nws qhov kev ua tau zoo thaum kev thauj mus los thiab cia. Cov ntawv luam tawm yog hais txog kev siv lub cev thiab tshuaj lom neeg ntawm kev luam ib yam khoom zoo ntawm cov ntawv luam tawm raws li qhov tsim nyog. Qhov xwm ntawm cov ntawv ceeb toom xov xwm yuav tsum muaj kev cuam tshuam zoo tshaj plaws kom zoo thiab muaj xim zoo. Thaum lub sijhawm ua haujlwm ntawm lub nruas, tus cwj mem xaj tso rau ntawm lub phaj luam ntawv yuav tsum tau pauv mus rau qhov chaw kom tiav, tag nrho, meej thiab nplua nuj graphic.
Cov ntawv xov xwm ntawm cov ntawv yob tuaj yeem muaj cov qauv pore thiab cov cwj mem kua naj npawb ntawm daim ntawv, qhov smoothness thiab compressibility ntawm daim ntawv, lub zog ntawm daim ntawv, lub acidity thiab alkalinity ntawm daim ntawv, thiab cov dej noo thiab stretchability ntawm daim ntawv.
1. Tus qauv pore thiab ntim khoom absorb ntawm daim ntawv. Daim ntawv no yog ib hom qauv ntawm cov kab sib txawv hauv cov ntoo uas muaj ntau yam cog ntoo. Nyob rau hauv qhov kev teeb tsa network no, qee cov fillers, cov khoom siv roj hmab thiab cov ntaub ntawv xim muaj ntxiv rau cov pores ntawm cov fibers kom txaus siab rau daim ntawv nws tus kheej. Muaj tus yam ntxwv. Ntxiv cov muab tub lim yog los txhim kho cov xim dawb, npliag thiab khov ntawm daim ntawv; ntxiv cov roj hmab yog ua kom cov ntawv muaj dej txaus, tsis yooj yim infiltrated los ntawm dej los yog lwm yam kua; ntxiv cov khoom kom thas xim kom daim ntawv muaj cov xim dawb dua. Daim ntawv L-Voj Lub Tshaj Tawm yog lub hauv paus rau ntawm daim ntawv los pleev xim, thiab yog ib qho tseem ceeb rau kev nkag mus thiab ziab ntawm ntawv xov xwm luam ntawv. Yog li ntawd, kom nkag siab txog qhov ntim quav ntawm daim ntawv, koj yuav tsum xub nkag siab lub qauv ntawm daim ntawv. Vim tias qhov pore qauv ntawm daim ntawv yog ze rau tus lej number case penetration, ceev ceev, luam lus smoothness, nkag mus thiab solidification ntawm tus number case, thiab print zoo.
Cov txheej txheem pore ntawm daim ntawv tsuas yog muaj cov void ratio ntawm daim ntawv. Lub void ratio ntawm daim ntawv qhia qhov piv ntawm qhov ntim ntawm huab cua nyob rau hauv daim ntawv mus rau lub ntim ntawm daim ntawv. Tus lej ntawm daim ntawv tuaj yeem tau los ntawm qhov muab xam thiab sim kev ntsuas.
Daim ntawv pov tseg piv = ntim ntawm huab cua hauv daim ntawv (tsev thaj chaw) / ntim ntawm ntawv (thaj chaw) x 100%
Nws tuaj yeem pom los ntawm cov kab zauv saum toj saud uas loj dua qhov ntim ntawm cov ntawv hauv daim ntawv, ntau dua qhov void ratio ntawm daim ntawv, uas kuj tuaj yeem pom qhov mob hauv cov qauv hauv daim ntawv. Tsawg dua daim ntawv fibers, lub looser interlacing, ntau dua qhov kev sib tshuam sib txuam Loj loj, cov neeg pluag daim ntawv pore qauv. Ntawm qhov tsis yog, daim ntawv fibers, lub denser interlacing, qhov me me qhov chaw interfiber, thiab qhov zoo dua ntawm cov ntawv pore qauv.
Cov ntaub ntawv pov thawj thiab ziab ntawm cov cwj mem zauv ntawm daim ntawv yog ceev li cov void ratio nce, thiab tus number case absorbency kuj nce, tab sis tus number case gloss rau hauv daim ntawv deg txo raws li qhov void ratio nce.
Daim ntawv muaj cov qauv pore, thiab cov qauv ntawm cov ntawv txiav txim siab rau daim ntawv ua pa, hygroscopicity, absorbency thiab compressibility, uas yog lub hauv paus rau daim ntawv nqus dej, kua mem sau thiab zoo li. Yuav kom tau zoo dua cov ntawv luam tawm zoo thiab cov nyhuv luam tawm, luam ntawv yuav tsum muaj kom zoo dua ntawm tus cwj pwm absorbing zog. Cov nab npawb rau ntawm daim ntawv ntim quav yog hais txog qhov khoom ntim ntawm tus ntawv thiab kos absorbed tom qab daim ntawv xa los ntawm tus cwj mem thiab tus number case yog xa mus rau ntawm daim ntawv. Qhov loj ntawm daim ntawv khoob khoob piv, lub looser tus qauv, ntau tus cwj pwm nws absorbs, thiab vice versa. Qhov no yog vim li cas peb feem ntau hais tias daim ntawv absorbs tsis zoo.
2. Ntawv smoothness thiab compressibility. Lub smoothness ntawm daim ntawv yog hais txog cov ntaub ntawv uas lub qhov saum npoo ntawm daim ntawv yog txawm thiab du. Lub smoothness ntawm daim ntawv nyob ntawm txoj kev ua haujlwm uas siv thaum lub sijhawm ua cov ntawv, qhov faib rau cov fibers hauv daim ntawv, thiab daim ntawv thov ntawm lub muab tub lim.
Daim ntawv smoothness muaj xws li ntawv smoothness thiab print smoothness. Lub plhaub ntawm daim ntawv nplaum yog hais txog lub sijhawm uas yuav tsum tau ntim cov cua kom dhau ntawm qhov sib txawv ntawm daim ntawv thiab cov iav hauv qab ntawm tej qhov chaw muaj qee yam ntawm lub tshuab nqus tsev, qhia hauv vib nas this. Daim ntawv smoothness yog feem ntau feeb ntawm 50 thiab 100 vib nas this, thiab raws li tus smoothness tsub kom, cov khoom ceev ceev tau nce. Kev luam tawm smoothness hais txog qhov sib piv ntawm daim ntawv mus rau lub nplhaib ntawm tus kheej lub tog raj kheej ntawm lub siab tshaj rau ntawm kev luam siab thiab luam ntawv ceev. Kev ntsuas ntawm cov luam ntawv smoothness yuav tsum tau tshwj xeeb ntawm cov twj paj nruag, thiab qhov tseeb ua haujlwm tsis muaj zog. Tam sim no, daim ntaub npliag los yog feem ntau yog siv los qhia qhov smoothness ntawm daim ntawv.
Kev luam ntawm cov duab luam tawm tau qhia los ntawm cov dots thiab cov khaubncaws sab nraud povtseg. Lub cab kuj ntawm daim duab yog daim pam. Kev sib cuag ntawm daim pam thiab daim ntawv ncaj qha cuam tshuam rau kev hloov ntawm cov duab kos. Nyob rau tib lub siab thiab daim pam, tus smoothness ntawm daim ntawv. Nws yog lub precondition ntawm kev hloov cov duab thiab cov ntawv nyeem. Tus smoother daim ntawv, qhov ntau ntawm cov ntawv dots txuas mus rau ntawm daim ntawv qhov chaw, qhov ze dua tus lej ntawm daim ntawv ntwv dej txaus rau cov ntaub ntawv, qhov closer cov duab dot loj thiab cov ink absorption, tag nrho txo cov duab thiab cov ntawv . Ntau qhov tseeb. Ntawm qhov tsis sib xws, daim duab rov qab los yog qhov tseem phem dua.
Tus cawv ntawm cov ntawv sau rau ntawm daim ntawv luam tawm yog thas xim hauv daim ntawv thaum lub sij hawm luam tawm, thiab qhov saum npoo ntawm ntawv yog flattened, uas tswj kev sib cuag ntawm cov nplaim ntawm daim ntawv thiab cov pam ntawm daim pam, thiab muab cov kev mob zoo dua rau kev hloov ntawm tus number case. . Vim tias cov ntawv xov xwm tau yooj ywm thiab yooj yim heev hauv kev cuam tshuam ntawm kev luam ntawv, qhov sib tiv tauj ntau ntawm daim ntawv thiab daim pam ntawm daim pam yuav tsum yog. Yog hais tias luam tawm ntawm daim ntawv ruaj khov, vim lub thickness ntawm daim ntawv nws tus kheej thiab qhov tsis sib luag ntawm qhov chaw, thaum daim pam yog nyob rau hauv kev sib cuag nrog daim ntawv, lub zog ntawm ntau qhov chaw hauv daim ntawv yog tsis ncaj, thiab daim pam yog hloov mus rau saum npoo ntawm daim ntawv. Muaj distortions xws li qhov muag plooj los sis lub cev deformation thiab poob.
3. Lub zog ntawm daim ntawv. Lub zog ntawm daim ntawv yog lub cuab yeej ntawm lub zog ntawm lub fibre, cov ntaub cuv thiab cov roj hmab ntawm daim ntawv. Cov cuab yeej no muaj kev cuam tshuam ncaj qha rau ntawm lub cev nqaij daim tawv. Lub tshuab fiber ntau ntawm cov ntawv xov xwm tseem ceeb heev, tshwj xeeb tshaj yog qee cov ntoo phom sij luv thiab cov impurities cuam tshuam rau cov qauv hauv cov pawj. Hauv papermaking, thiaj li yuav ua rau kom lub ntsej muag, opacity thiab smoothness ntawm cov ntawv xov xwm, ua rau cov dej tsis ua haujlwm ntawm daim ntawv. , ib qho ntawm cov fillers thiab cov sib txuas muaj ntau dua los yog tsawg dua. Tus nqi ntawm cov khoom siv thiab cov roj hmab ntxiv tau ncaj qha rau ntawm lub zog ntawm daim ntawv. Tsis tas li ntawd, calendering ntawm lub calender ncaj qha rau lub zog ntawm daim ntawv. Hauv kev luam cov txheej txheem, lub peev xwm ntawm daim ntawv tawm tsam cov hmoov tshem tawm thiab rub tawm yog collectively hu ua lub zog ntawm daim ntawv.
Tam sim no, kev ntsuas ntawm lub zog ntawm daim ntawv tau raug qhia los ntawm tus nqi ntawm txoj kev rub tawm. Daim ntawv hais txog kev ceev nrig yog hais txog kev ceev ntawv ntawm daim ntawv thaum lub nrob qaum ntawm daim ntawv nyob rau ntawm daim ntawv yog ntau tshaj qhov sib txhuam ntawm daim ntawv raws li cov kev luam ntawv nce ntxiv, ua rau ntawv nto pib hmoov . Nws yog qhov rub tawm ceev ntawm daim ntawv. Los ntawm no tus nqi ntawm txoj kev rub tawm, qhov sib xyaw ntawm lub zog ntawm daim ntawv deg yuav paub. Nyob rau hauv cov zwj ceeb ntawm kev luam ntawv siab thiab khov kho tsis tu ncua, ceev ceev qhov kev luam ntawv, qhov loj dua qhov rov qab ntawm tus cwj mem rau daim ntawv, thiab ntau dua qhov rub tawm ntawm daim ntawv. Thiaj li yuav ua kom lub zog ntawm daim ntawv zoo, ntxiv rau qhov ua kom lub zog ntawm daim ntawv tawm, txo cov viscosity ntawm tus cwj pwm kuj yog ib txoj kev zoo.
4. Cov acidity thiab alkalinity ntawm daim ntawv. Ib cov ntawv nws tus kheej muaj ib qho pH. Cov pH feem ntau yog hais txog cov pH.
Lub acidity thiab alkalinity ntawm daim ntawv nws tus kheej yog vim hais tias daim ntawv yog nyob rau hauv tus txheej txheem ntawm kev tsim daim ntawv. Vim yog txoj kev ua pa pulping, qee tus siv cov pa pulping, qee cov siv alkali pulping, thiab tom qab ntawd ntxiv cov khoom xyaw txheej, thiab thaum kawg ua daim ntawv tiav. Nws muaj ib qho acidity thiab alkalinity. Lub acidity thiab alkalinity ntawm daim ntawv nws tus kheej muaj cov nyhuv ntawm cov ziab ntawm cov zauv thaum lub sij hawm luam ntawv, tshwj xeeb tshaj yog cov kabmob sib xyaw kom haum ntawm oxidized conjunctiva, vim txoj kev ziab los ntawm oxidation daim ntawv tiav, thiab acidity thiab alkalinity ntawm daim ntawv nws tus kheej teev rau hauv qee yam qis pH. Lub zog ntawm acidity thiab alkalinity ntawm daim ntawv ncaj qha cuam tshuam lub degree ntawm ziab ntawm tus number case. Tsis tas li ntawd, lub tshuab luam ntawv muab luam tawm ua daim ntawv nto, thiab vividness ntawm tus cwj pwm xim tseem raug cuam tshuam los ntawm acidity ntawm daim ntawv.
Lub acidity thiab alkalinity ntawm daim ntawv muaj certain tswj cai, raws li tau zoo raws li ntawv xov xwm. Hauv cov ntawv luam ntawm cov ntawv xov xwm, nws feem ntau yog siv los ntxiv cov kua qaub uas tsis muaj zog rau cov dej kom tsim ib txoj hauv kev dampening, kom cov pH ntawm dampening tov yog tswj ntawm 5-6, uas tswj kev tsim cov lej thiab dej tshuav ntawm daim ntawv luam tawm, thiab acidity thiab alkali ntawm daim ntawv deev Qhov zoo tshaj plaws kev tswj ntawm qaub qho qaub thiab qis qis, thiaj li tsis mus ua kom puas acid-tsob tshuav ntawm daim txiag phaj.
5. Cov dej noo noo thiab qhov ntev ntawm daim ntawv. Cov ntsiab lus ntawm cov ntawv hauv dej yog lub zog ntawm lub cev uas qhia tias qhov hnyav ntawm daim ntawv txo los ntawm qhov hnyav ntawm lub hauv paus ntawv thaum daim ntawv qhuav mus rau qhov nqi tas li ntawm 100 ° C mus txog 105 ° C, uas yog qhov feem pua. Qhov tseeb, daim ntawv yeej ib txwm muaj nyob rau hauv cov ntawv tom qab tau muab luam tawm. Nws yog ib qho tseem ceeb, thiab nws cov ntsiab lus ntawm cov dej noo hloov nrog kev hloov ntawm qhov kub thiab txias. Daim ntawv tso rau hauv cov huab cua nyob rau hauv ib qho kev ntsuas kub thiab av noo, thiab nws yog nyob rau hauv lub fiber ntau nws tus kheej. Cov dej ntsiab lus thiab dej cov ntsiab lus nyob rau hauv cov huab cua muaj niaj hnub dynamic noo sib pauv, tswj tus txheeb ze sib npaug txhua lub sijhawm.
Cov dej ntsiab lus ntawm daim ntawv yog inversely proportional rau qhov kub thiab txias, uas yog, cov dej ntsiab lus ntawm daim ntawv yog nce thaum ntsuas kub. Ntawm qhov tsis sib xws, qhov kub tau qis dua, cov dej ntsiab lus ntawm daim ntawv muaj zog, thiab cov ntsiab lus ntawm cov ntawv sau hloov yog +5 ° C, thiab cov ntsiab lus ntawm dej yog hloov los ntawm 0.15%, uas yog cuam tshuam nrog proportional . lwm txoj kev sib raug zoo. Yog li, qhov kev ntsuas kub hauv qhov kev sib tw yuav tsum tsis txhob zoo dua li 3 ° C. Thaum lub sij hawm dhau tus txheej txheem, cov ntsiab lus ntawm cov ntawv tsis hloov los ntawm ntau tshaj ± 0.1%, txwv tsis pub cov ntaub ntawv tshaj ntawm qhov yuav ua rau.
Txheeb ze cov av noo muaj cov nyhuv rau cov dej hauv daim ntawv. Vim yog qhov kev nyab xeeb ntawm kev nyab xeeb, qhov txheeb ze ntawm cov pa ntawm huab cua tsis ruaj khov. Daim ntawv absorbs dej thiab cov dej nrog cov kev hloov ntawm cov av noo, yog li cov ntawv muaj dej ntau cov ntsiab lus nyob rau hauv txawv humidity. Cov txheeb ze ntawm cov huab cua nyob hauv cov huab cua muaj kev sib raug zoo nrog qhov kev hloov ntawm cov dej noo ntawm daim ntawv. Cov dej ntsiab lus ntawm daim ntawv nce ntxiv raws li qhov ntsuas ntawm cov pa cua ntawm lub nce, thiab sib piv, txo thaum sib txheeb ntawm cov txheeb ze. Thaum twg cov txhuam ntawm cov pa ntawm cov pa tsis tshaj li ntawm 80%, tus txhub ze ntawm 100%, thiab cov dej ntsiab lus ntawm daim ntawv muaj qhov hloov ntawm 1%. Txawm li cas los xij, thaum twg tus txheeb ze cov av ntub tshaj 80%, qhov hloov ntawm cov dej nyob hauv dej nce siab. Feem ntau nce mus rau 1.5% mus rau 2%.
Lub stretchability ntawm daim ntawv no ncaj nraim ntsig txog cov dej noo ntawm daim ntawv. Vim cov ntsiab lus dej tsis sib xws, daim ntawv fibers feem ntau nthuav thiab ncab zog, uas ua rau daim ntawv loj loj los sis txo, ua rau tsis muaj tseeb tshaj qhov qub.
Daim ntawv stretchability yog hais txog qhov hloov ntawm daim ntawv loj tom qab daim ntawv tiav nyob rau ntawm tej qhov kub thiab cua-qhuav thiab ces cua-ziab. Qhov sib piv ntawm qhov nce los yog qis dua ntawm daim ntawv loj me me mus rau qhov loj ntawm lub hauv paus ntawv yog qhia raws li ib feem pua.
Cov ntaub ntawv muaj fiber ntau swells tom qab nws absorbs dej, thiab qhov nthuav ntawm cov kab hluav taws xob loj yog ntau loj tshaj qhov longitudinal expansion, feem ntau 2-8 zaug. Txoj kev cog lus thiab kev cog lus ntawm daim ntawv ua rau ntau cov kev ua tiav zoo hauv kev luam ntawv. Piv txwv li, cov dej hauv ob sab ntawm daim ntawv yog siab tshaj nruab nrab, thiab ob sab yuav tsim ib "ploj zuj zus", thiab raws li qhov kev coj ua ntawm sab nrauv yuav tsim ib "pleat" ntawm ntug nruj, uas yuav tsim cov pob kws thiab creases ib zaug luam tawm ntawm lub tshuab. Nyob rau hauv loj heev mob, nws yuav cuam tshuam rau lub qub ua haujlwm ntawm daim kab xev, thiab nws yuav rhuav ncaj qha. Thaum nws tawm los rau cov xim luam yeeb, nws cov xim tsis muaj zog yuav tsis tuaj yeem ua tau. Yog li, peb yuav tsum ua tib zoo txhawm rau hloov txoj cai ntawm cov dej ntawv cov ntaub ntawv thiab tswj kev nruj thiab deformation ntawm ntawv. Ib qho ntawm cov ntaub ntawv raw, qhov zoo ntawm cov ntawv cia yuav ncaj qha rau kev siv thiab siv daim ntawv. Thaum lub sijhawm ntawm kev yuav khoom thiab cia khoom, nws yog qhov yuav tsum tau them sai sai rau kev tshuaj xyuas thiab kev lees txais ntawm daim ntawv yob. Hauv particular, cov txheej pob yuav tsum tau nruj me ntsis. Lub chaw cia khoom tshwj xeeb heev. Ntxiv nrog rau qhov cua, dej noo thiab lub teeb, nws yuav tsum raug tiv thaiv tawm tsam hluav taws, hluav taws xob thiab dej. Thiab lwm yam kev tiv thaiv kev ruaj ntseg. Hauv kev tswj cov ntawv xov xwm, cov cai yuav tsum tau ua raws li nram no:
1. Cia Kev: Lub stacking ntawm lub vev xaib yuav tsum tsis txhob siab dhau. Yog tias nws muaj cai, nws tuaj yeem tsim thiab txhim kho kom tiav ntawm daim ntawv pov tseg, thiab tib lub sij hawm tiv thaiv daim ntawv los ntawm corrugated thiab daim ntawv tub ntxhais deformed.
2. Hws noo-puavpheej: Daim ntawv muaj zog hygroscopicity thiab yog nkag siab ntawm kev kub ntxhov thiab av noo ntawm qhov chaw. Daim ntawv yog yooj yim deformed tom qab noo noo nqus, uas ua rau muaj teeb meem loj rau kev siv. Tsuas yog, yog muab ntaub ntawv qhwv tawm los yog daim ntawv qhwv cov ntawv tawg tas, thiab lwm yam zoo li, yuav tsum tau them nyiaj rau nws cov khoom qoob loo. Qhov chaw cia khoom yuav tsum muaj qhov cua, hauv av yuav tsum tau raug tiv thaiv los ntawm ya raws, thiab phab ntsa yuav tsum qhuav. Nws yog qhov zoo tshaj plaws los ua ib daim ntawv kev lag luam rau cov neeg siv khoom mus ntev ntev thiab siv cov ntawv xov xwm. Lub nruab nrab ntawm qhov chaw nruab nrab ntawm qhov chaw cia khoom yog zoo li 50-55%.
3. Kev tiv thaiv tiv thaiv tshav ntuj: Qhov chaw uas muab cov ntawv yob cia yuav tsum muaj hnub tiv thaiv kom tsis txhob muab cov ntawv yob tawm los ntawm kev tshav ntuj los yog raug tshav ntuj. Vim hais tias daim ntawv nws tus kheej muaj ib qho qis npaum li cas ntawm cov khoom ya, noo noo nyob rau hauv lub yob ntawv pob yog raug balanced. Thaum raug, daim ntawv yob tsoo sov, daim ntawv dej tshuav puas ntsoog, daim ntawv yuav tso dej rau saum huab cua, daim ntawv shrinks thiab cov ntawv ua kua ua rau nkig. Tsis poob ntawm kev nplua thiab kev luam ntawv.
4. Kev tiv thaiv thaum tshav kub kub: Nyob rau hauv qhov chaw uas muaj ntawv tso, qhov kub thiab txias tsis yog raws li cov av qeeg, thiab cov dej tau hloov sai heev. Txawm li cas los xij, thaum lub ntsuas kub tshaj li qhov yuav tsum tau ua, lub zog ntawm txhua yam yuav ua rau kom muaj zog. Qhov kub cia yog feem ntau tswj tau ntawm 18 ° C txog 25 ° C.
5. Tsheb thauj mus los, thau khoom thiab thau khoom: Vim muaj qhov ntim loj thiab ntim ntawm daim ntawv, lub tsheb npav yuav tsum mloog zoo rau nws cov khoom ntim, thiab tib lub sij hawm ua tiav cov kev tiv thaiv kev tiv thaiv saum toj. Tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv ntawm los nag, nws yog ib qhov tsim nyog los tiv thaiv los nag thiab noo noo, lwm yam, daim ntawv saum npoo kuv yuav ncaj qha hem raug teeb meem. Thaum thauj khoom thiab thau tawm, tag nrho siv kev forklift lossis tsheb, qhov kev xav tau tsuas yog ua kom tsis txhob cuam tshuam cov ntawv ntim ntawm cov ntawv yau thaum lub sij hawm thauj khoom thiab tawm kev tawm, txwv tsis pub nws yuav ua rau poob ntawv ntawm kev ywj pheej thiab tso hem thawj cia thiab siv lub yob ntawv.
6. Siv: Cov ntawv tshaj tawm yuav tsum tswj cov cua kub thiab cov av ntawm qhov chaw povhwm luam ntawv thaum siv nws kom tsis txhob muaj kev nqhis dej ntawm daim ntawv. Lub zog tensile ntawm daim ntawv yuav txo tau tom qab kev nqus dej noo, thiab daim ntawv breakage yuav tshwm sim thaum lub sijhawm luam ntawv. Ntxiv mus, cov kev hloov hauv cov kub thiab cov av noo tuaj yeem ua rau daim ntawv kom ncab thiab cuam tshuam qhov tseeb ntawm kev luam ntawv. Cov lej ntawm cov ntawv ceeb toom muaj zog heev. Tom qab luam ntawv, tus number case tuaj yeem ua kom yooj yim absorbed thiab kho, uas yog tsim rau high-speed printing. Hauv kev luam ntawv, cov ntawv yuav tsum ua rau kev pom zoo thiab kev siv ntawm tus cwj pwm xiam oob khab yuav tsum tau ua raws li cov yam ntxwv ntawm cov ntawv xov xwm. Cov ntawv ceeb toom muaj cov ntoo loj. Nws yog ib qho yooj yim rau oxidize thiab tig daj thiab ua pa tom qab pom lub teeb. Yog li ntawd, nws tsis haum rau lub sij hawm ntev cia, thiab nws tsis haum rau luam tawm cov ntaub ntawv ntev.
Ua ib hom ntawv siv luam ntawv, yog tias peb muaj qhov tseeb zoo ntawm nws tus cwj pwm thiab kev ua tau zoo, peb tuaj yeem tswj nws cov ntawv luam tawm thiab khaws cia thiab siv nws, peb yuav muaj peev xwm maximize nws cov nuj nqi thiab nce nws cov ntawv luam tawm. Thiab zoo, tuaj yeem nqa nyiaj txiag ntau dua.