Raws li cov khoom tseem ceeb ntawm lub qhov ncauj qhov ntswg kho mob, qhov pom kev ua haujlwm ntawm cov ntaub nplaum meltblown ncaj qha cuam tshuam rau kev tiv thaiv ntawm lub qhov ncauj qhov ntswg. Muaj ntau yam uas cuam tshuam rau kev pom kev ua tau zoo ntawm cov ntaub meltblown, xws li fiber ntau ntom, fiber ntau mesh qauv, thickness, thiab ntom.
Txawm li cas los, raws li ib tughuab cua lim khoomrau lub qhov ncauj qhov ntswg, yog tias cov khoom nruj dhau lawm, lub qhov hws me dhau, thiab qhov ua tsis taus pa siab dhau, tus neeg siv tsis tuaj yeem nqus tau pa, thiab lub npog ntsej muag poob nws cov nqi.
Qhov no yuav tsum tau cov khoom siv lim tsis tsuas yog txhawm rau txhim kho nws cov kev ua haujlwm pom, tab sis kuj txo qis nws txoj kev ua pa kom ntau li ntau tau, thiab kev ua pa tsis zoo thiab kev ua kom pom tseeb yog qhov sib txawv. Txoj kev kho electrostatic polarization yog txoj hauv kev zoo tshaj los daws qhov tsis sib haum xeeb ntawm kev ua pa ua pa thiab pom kev ua haujlwm zoo.
Lub filtration mechanism ntawm meltblown ntaub
Nyob rau hauv lub filtration mechanism ntawm yaj cua tshuab lim cov ntaub ntawv, feem ntau pom zoo mechanisms mas muaj xws li Brownian diffusion, interception, inertial kev sib tsoo, lub ntiajteb txawj nqus zaum, thiab electrostatic adsorption. Vim lub fact tias thawj plaub lub hauv paus ntsiab lus yog tag nrho cov neeg kho tshuab teeb meem, lub filtration mechanism ntawm meltblown fabrics tau yooj yim summarized li mechanical barriers thiab electrostatic adsorption.
Mechanical barrier
Qhov nruab nrab fiber ntau txoj kab uas hla ntawmpolypropylene meltblown ntaubyog 2-5 μ m, thiab cov tee me me uas muaj qhov loj dua 5 μ m hauv huab cua tuaj yeem thaiv los ntawm cov ntaub nplaum.
Thaum txoj kab uas hla ntawm cov hmoov av zoo yog tsawg dua 3 μ m, cov fibers hauv cov ntaub meltblown yog randomly teem thiab interlayered los ua ib tug multi curved channel fiber lim txheej. Thaum cov khoom hla dhau los ntawm ntau hom kev nkhaus lossis txoj hauv kev, cov plua plav zoo yog adsorbed ntawm fiber ntau los ntawm cov neeg kho tshuab pom van der Waals quab yuam.
Thaum cov particle loj thiab airflow tshaj tawm yog ob qho tib si loj, cov airflow mus txog cov khoom lim thiab muaj kev cuam tshuam, ua rau nws ntws ncig, thaum cov khoom detach los ntawm streamline vim inertia thiab sib tsoo ncaj qha nrog cov fibers, raug ntes.
Thaum cov particle loj me me thiab tus nqi ntws tsawg, cov khoom sib txawv vim Brownian txav thiab sib tsoo nrog cov fibers yuav tsum tau ntes.
Electrostatic adsorption
Electrostatic adsorption yog hais txog kev ntes cov khoom los ntawm Coulomb quab yuam ntawm cov nqi fibers (polarizations) thaum cov fibers ntawm cov khoom lim raug them. Thaum plua plav, kab mob, kab mob thiab lwm yam khoom hla dhau los ntawm cov khoom siv lim, electrostatic quab yuam tuaj yeem tsis tsuas yog nyiam cov khoom siv xwb, tab sis kuj tseem tuaj yeem ntes cov kab hluav taws xob tsis zoo los ntawm electrostatic induction nyhuv. Raws li qhov muaj peev xwm electrostatic nce, cov nyhuv electrostatic adsorption yuav muaj zog dua.
Taw qhia rau Electrostatic Electrification txheej txheem
Vim qhov pom kev ua haujlwm zoo ntawm cov khoom siv meltblown uas tsis yog-woven yog tsawg dua 70%, tsuas yog tso siab rau ntawm cov khoom siv cuam tshuam ntawm peb-dimensional aggregates ntawm fibers nrog nplua fibers, me me voids, thiab siab porosity tsim los ntawm meltblown ultrafine fibers tsis txaus. Yog li, cov ntaub ntawv pov thawj meltblown feem ntau ntxiv cov teebmeem electrostatic rau cov ntaub meltblown los ntawm electrostatic polarization tshuab, siv cov txheej txheem electrostatic los txhim kho kev pom zoo, ua kom nws ua tau 99.9% mus rau 99.99% pom efficiency. Ib txheej nyias nyias tuaj yeem ua tau raws li cov qauv xav tau, thiab kev ua pa ua pa kuj tseem qis.
Tam sim no, cov txheej txheem tseem ceeb ntawm electrostatic polarization muaj xws li electrospinning, corona tawm, kev sib txhuam induced polarization, thermal polarization, thiab low-zog electron beam bombardment. Ntawm lawv, corona tawm tam sim no yog txoj kev zoo tshaj plaws electrostatic polarization.
Txoj kev tawm corona yog ib txoj hauv kev them cov khoom siv meltblown los ntawm ib lossis ntau txheej ntawm rab koob zoo li electrodes (voltage feem ntau 5-10KV) ntawm lub tshuab hluav taws xob electrostatic ua ntej winding lub meltblown fiber ntau mesh. Thaum siv hluav taws xob siab, cov cua hauv qab ntawm rab koob ua rau corona ionization, uas ua rau hauv zos tawg tawm. Cov neeg nqa khoom tau tso rau saum npoo ntawm cov ntaub meltblown nyob rau hauv qhov kev txiav txim ntawm hluav taws xob teb, thiab qee cov neeg nqa khoom yuav raug kaw los ntawm cov ntxiab ntawm cov niam tsev nyob ruaj khov rau hauv qhov chaw, ua rau cov ntaub meltblown yog cov khoom siv lim rau lub cev ruaj khov.
Kev nce tus nqi ntawm cov ntaub meltblown tuaj yeem tau txais los ntawm corona tawm txoj kev kho electrostatic tawm, tab sis txhawm rau tiv thaiv kev lwj ntawm cov khoom siv hluav taws xob electrostatic, cov muaj pes tsawg leeg thiab cov qauv ntawm cov khoom siv hluav taws xob meltblown yuav tsum tau ua kom muaj txiaj ntsig zoo rau kev khaws cia. Txoj hauv kev los txhim kho tus nqi khaws cia ntawm cov khoom siv hluav taws xob tuaj yeem ua tiav los ntawm kev qhia cov khoom siv ntxiv nrog cov nqi khaws cia kom tsim cov cuab yeej thiab ntes cov nqi.
Yog li ntawd, piv nrog cov tshuab ziab khaub ncaws zoo tib yam, kev tsim cov khoom siv yaj cua tshuab rau huab cua pom yuav tsum tau ntxiv cov khoom siv hluav taws xob hluav taws xob electrostatic tawm hauv cov kab ntau lawm, thiab ntxiv cov polar masterbatch xws li tourmaline hais rau cov khoom siv raw polypropylene (PP).
Lub ntsiab yam tseem ceeb cuam tshuam cov nyhuv ntawm electrospinning kev kho mob ntawm meltblown fabrics
1. Kev them nyiaj yug: lub sij hawm them, them qhov deb, them voltage;
2. Thickness;
3. Cov khoom siv hluav taws xob.
Dongguan Liansheng Nonwoven Technology Co., Ltd.tau tsim nyob rau hauv lub Tsib Hlis 2020. Nws yog ib tug loj-scale non-woven npuag ntau lawm enterprise integrating kev tshawb fawb thiab kev loj hlob, ntau lawm, thiab muag khoom. Nws tuaj yeem tsim ntau yam xim ntawm PP spunbond non-woven fabrics nrog qhov dav ntawm tsawg dua 3.2 meters los ntawm 9 grams mus rau 300 grams.
Post lub sij hawm: Oct-26-2024