Ntau tus neeg paub tias lub hauv paus ntawm qhov ncauj qhov ntswg phais thiab N95 qhov ncauj qhov ntswg yog txheej nruab nrab - cov paj rwb meltblown.
Yog tias koj tseem tsis tau paub, cia peb saib luv luv ua ntej. Cov npog ntsej muag raug muab faib ua peb txheej, nrog rau ob txheej txheej yog spunbond non-woven npuag thiab nruab nrab txheej yog cov paj rwb meltblown. Txawm hais tias nws yog spunbond non-woven fabric lossis meltblown paj rwb, lawv tsis yog ua los ntawm paj rwb, tab sis ntawm yas polypropylene (PP).
Behnam Pourdeyhimi, Tus Lwm Thawj Coj ntawm Lub Tsev Haujlwm ntawm Cov Khoom Siv Tsis-woven ntawm North Carolina State University thiab tus xibfwb ntawm cov ntaub ntawv tshawb fawb, tau piav qhia tias cov khaubncaws sab nraud povtseg ntawm cov ntaub tsis-woven ntawm lub ntsej muag phais tsis muaj peev xwm lim cov kab mob. Lawv tsuas tuaj yeem thaiv cov kua tee dej, thiab tsuas yog txheej nruab nrab ntawm cov paj rwb meltblown muaj kev ua haujlwm ntawm lim cov kab mob.
Cov kev ua haujlwm lim dej ntawm cov ntaub nplaum uas tsis yog-woven.
Qhov tseeb, qhov pom kev ua haujlwm zoo (FE) ntawm fibers yog txiav txim siab los ntawm lawv qhov nruab nrab txoj kab uas hla thiab ntim ntim. Qhov me me ntawm fiber ntau txoj kab uas hla, qhov siab dua qhov pom kev ua haujlwm.
Txoj kab uas hla ntawm yaj cov paj rwb tiav lawm yog kwv yees li ntawm 0.5-10 microns, thaum lub cheeb ntawm spunbond txheej fibers yog nyob ib ncig ntawm 20 microns. Vim cov fibers ultrafine, yaj tshuab paj rwb muaj qhov chaw loj thiab tuaj yeem nqus tau ntau yam micro hais. Dab tsi yog qhov tseem ceeb tshaj plaws yog tias cov paj rwb meltblown yog qhov ua pa, ua rau nws yog ib qho khoom siv zoo rau kev ua lub ntsej muag lim dej, thaum spunbond non-woven fabric tsis yog.
Cia peb saib cov txheej txheem tsim khoom ntawm ob hom nonon-woven fabrics.
Thaum ua spunbond non-woven npuag, polypropylene yog melted thiab rub mus rau hauv txhob lo lo ntxhuav, uas ces tsim ib mesh - Piv rau spunbond nonwoven fabrics, meltblown paj rwb muaj ntau yam advanced technology, thiab qhov tseeb, meltblown technology yog tam sim no tib technology siv rau loj-scale zus tau tej cov micron loj fibers.
Kev tsim cov txheej txheem ntawm cov tshuab ziab khaub ncaws
Lub tshuab tuaj yeem tsim cov cua kub ceev ceev, uas yuav txau cov polypropylene molten los ntawm qhov qhib me me yaj lub dav hlau nozzle, nrog rau cov nyhuv tib yam li cov tshuaj tsuag.
Misty ultrafine fibers sib sau ua ke ntawm cov chais los yog daim hlau los ua cov ntaub nplaum uas tsis yog-woven - qhov tseeb, kev tshoov siab rau cov tshuab yaj tshuab los ntawm qhov xwm txheej. Tej zaum koj yuav tsis paub tias qhov xwm txheej kuj tsim cov ntaub ntawv meltblown. Feem ntau muaj qee qhov txawv txawv saib ze ze ntawm lub roob hluav taws kub, uas yog Pele cov plaub hau, uas yog ua los ntawm basaltic magma cua tshuab los ntawm cua kub ntawm lub roob hluav taws.
Xyoo 1950, US Naval Research Laboratory (NRL) thawj zaug siv cov tshuab meltblown los tsim cov fibers rau lim cov ntaub ntawv xov tooj cua. Niaj hnub no, yaj tshuab tshuab tsis yog tsuas yog siv los tsim cov ntaub ntawv lim dej thiab roj, tab sis kuj tseem tsim cov khoom siv rwb thaiv tsev xws li cov ntxhia wool. Txawm li cas los xij, qhov pom kev ua haujlwm ntawm cov paj rwb meltblown nws tus kheej tsuas yog li 25%. Yuav ua li cas 95% pom kev ua tau zoo ntawm N95 qhov ncauj qhov ntswg tuaj txog?
Qhov no yog ib kauj ruam tseem ceeb hauv kev tsim cov txheej txheem kho mob meltblown paj rwb - electrostatic polarization kev kho mob.
Nws zoo li qhov no, raws li peb nyuam qhuav hais, qhov pom kev ua haujlwm ntawm lub qhov ncauj qhov ntswg yog cuam tshuam nrog lawv txoj kab uas hla thiab txhaws ntom. Txawm li cas los xij, yog tias woven nruj heev, lub npog ntsej muag yuav tsis ua pa thiab tus neeg hnav yuav tsis xis nyob. Yog tias kev kho electrostatic polarization tsis ua tiav, qhov pom kev ua haujlwm ntawm cov ntaub nplaum uas tuaj yeem ua rau tib neeg xav tias tsis taus pa tsuas yog 25%.
Peb tuaj yeem txhim kho kev ua pa thaum ua kom pom kev ua haujlwm zoo li cas?
Xyoo 1995, tus kws tshawb fawb engineering Peter P. Tsai los ntawm University of Tennessee tuaj nrog lub tswv yim ntawm electrostatic nag lossis daus tshuab siv hauv kev pom kev lag luam.
Hauv kev lag luam (xws li lub tshuab hluav taws xob lub tshuab hluav taws xob), cov kws tsim khoom siv lub tshuab hluav taws xob los them cov khoom siv hluav taws xob thiab tom qab ntawd siv daim phiaj hluav taws xob los nqus lawv txhawm rau txhawm rau lim tawm cov khoom me me.
Siv tshuab electrostatic precipitator los lim cua
Kev tshoov siab los ntawm cov thev naus laus zis no, ntau tus neeg tau sim ua hluav taws xob yas fibers, tab sis tsis tau ua tiav. Tab sis Cai Bingyi ua nws. Nws tau tsim ib txoj hauv kev los them cov yas, ionizing huab cua thiab electrostatically them cov ntaub meltblown, tig nws mus rau hauv ib qho hluav taws xob, cov khoom siv tas mus li zoo li Pikachu.
Tom qab hloov mus rau Pikachu, ib txheej ntawm Pikachu yaj daim ntaub tuaj yeem tsis tsuas yog ncav cuag 10 txheej yam tsis muaj hluav taws xob, tab sis kuj nyiam cov khoom uas muaj txoj kab uas hla ntawm 100 nm, xws li COVID-19.
Nws tuaj yeem hais tias nrog Cai Bingyi thev naus laus zis, N95 lub ntsej muag tau tsim. Ntau lab tus tib neeg lub neej thoob plaws ntiaj teb tau tiv thaiv los ntawm cov cuab yeej no.
Qhov xwm txheej, Cai Bingyi cov txheej txheem them nyiaj electrostatic tshwm sim hu ua corona electrostatic charging, uas yog tib hom corona li tus kabmob coronavirus, tab sis ntawm no corona txhais tau hais tias corona.
Tom qab saib cov txheej txheem ntawm kev kho mob qib yaj cov paj rwb, koj yuav nkag siab txog nws cov kev nyuaj. Qhov tseeb, qhov nyuaj tshaj plaws ntawm cov txheej txheem tsim cov paj rwb meltblown tej zaum yuav yog kev tsim khoom ntawm cov paj rwb meltblown.
Thaum lub Peb Hlis Ntuj xyoo no, Markus M ü ller, tus thawj coj muag khoom ntawm Reicol, tus neeg muag khoom German ntawm cov tshuab meltblown, tau hais hauv kev xam phaj nrog NPR tias txhawm rau xyuas kom meej tias cov fibers zoo thiab ruaj khov zoo, cov tshuab meltblown xav tau siab precision thiab nyuaj rau kev tsim khoom. Lub sijhawm tsim khoom thiab sib dhos ntawm lub tshuab yog tsawg kawg 5-6 lub hlis, thiab tus nqi ntawm txhua lub tshuab tuaj yeem ncav cuag $ 4 lab. Txawm li cas los xij, ntau lub tshuab ntawm kev ua lag luam muaj cov qib tsis sib xws.
Hills, Inc. hauv Florida yog ib qho ntawm ob peb lub tuam txhab hauv ntiaj teb uas tuaj yeem tsim cov khoom siv paj rwb meltblown nozzles. Timothy Robson, lub tuam txhab R&D tus thawj coj, kuj tau hais tias cov khoom siv paj rwb meltblown muaj cov ntsiab lus thev naus laus zis siab.
Txawm hais tias Tuam Tshoj qhov kev tsim txhua xyoo ntawm lub qhov ncauj qhov ntswg suav txog li 50% ntawm lub ntiaj teb tag nrho, ua rau nws yog tus tsim khoom loj tshaj plaws thiab xa tawm lub ntsej muag, raws li cov ntaub ntawv los ntawm Tuam Tshoj Industrial Textile Industry Association nyob rau lub Ob Hlis, lub teb chaws tsim ntawm meltblown non-woven fabrics yog tsawg dua 100000 tons hauv ib xyoos, qhia txog qhov tsis txaus ntawm meltblown non-woven fabrics.
Xav txog tus nqi thiab lub sijhawm khoom xa tuaj ntawm meltblown fabric manufacturing machinery, cov lag luam me tsis zoo li yuav tsim ntau qhov tsim nyog meltblown paj rwb hauv lub sijhawm luv luv.
Yuav ua li cas txiav txim siab seb lub npog ntsej muag yuav tsim nyog thiab ua los ntawm cov paj rwb yaj?
Cov txheej txheem yog ua tau yooj yim heev, ua peb kauj ruam.
Ua ntej, vim tias txheej txheej txheej ntawm spunbond tsis-woven npuag hauv cov ncuav qab zib sandwich muaj cov khoom tsis muaj dej, lub ntsej muag kho mob tsim nyog yuav tsum tsis muaj dej. Yog tias lawv tsis muaj dej, lawv yuav ua li cas lim cov tee dej ntawm lub qhov ncauj? Koj sim nchuav dej rau nws zoo li tus tij laug no.
Thib ob, polypropylene tsis yooj yim rau ntes hluav taws thiab nws yooj yim rau yaj thaum raug tshav kub, yog li yaj cov paj rwb yuav tsis hlawv. Yog tias ci nrog lub teeb, cov paj rwb meltblown yuav dov thiab poob tawm, tab sis nws yuav tsis ntes hluav taws. Hauv lwm lo lus, yog tias txheej nruab nrab ntawm lub npog ntsej muag koj yuav ntes hluav taws thaum ci nrog lub teeb, nws yog qhov tseeb tiag.
Thib peb, kev kho mob meltblown paj rwb yog Pikachu, uas muaj hluav taws xob zoo li qub, yog li nws tuaj yeem khaws cov ntawv me me.
Tau kawg, yog tias koj yuav tsum siv tib lub npog ntsej muag ntau zaus, tus tsim ntawm N95, Cai Bingyi, kuj muaj cov lus qhia tshuaj tua kab mob.
Thaum Lub Peb Hlis 25th ntawm lub xyoo no, Cai Bingyi tau hais hauv lub vev xaib ntawm University of Tennessee tias cov nyhuv electrostatic polarization ntawm lub qhov ncauj qhov ntswg kho mob thiab N95 qhov ncauj qhov ntswg yog qhov ruaj khov heev. Txawm hais tias lub qhov ncauj qhov ntswg tau tshuaj tua kab mob nrog cov cua kub ntawm 70 degrees Celsius rau 30 feeb, nws tsis cuam tshuam rau lub ntsej muag polarization ntawm lub qhov ncauj qhov ntswg. Txawm li cas los xij, cawv yuav tshem tawm cov nqi ntawm cov ntaub meltblown, yog li tsis txhob muab tshuaj tua kab mob nrog cawv.
Los ntawm txoj kev, vim muaj zog nqus, thaiv, pom, thiab kev tiv thaiv kev tawm dag zog ntawm cov paj rwb meltblown, ntau cov khoom siv poj niam thiab cov ntaub npuag kuj tau ua nrog nws. Kimberly Clark yog thawj tus thov rau patents.
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