Dab tsi yog Porosity ntawm Nonwoven Fabric?

Yog hais tias koj twb tau tuav ib tug nonwoven npuag mus txog rau lub teeb, tej zaum koj yuav pom ib yam dab tsi nthuav - nws yog feem ntau tsis muaj qhov chaw. Qhov kev npliag ntawd tsis yog qhov txhaum; Nws yog qhov tseeb tias yog vim li cas cov nonwovens ua haujlwm zoo rau txhua yam los ntawm kev kho mob lub qhov ncauj qhov ntswg mus rau rwb thaiv tsev rau tu cov ntaub so ntswg.

Peb tab tom tham txog porosity, thiab nws yooj yim dua li nws suab.

Lub tswv yim yooj yim

Porosity tsuas yog qhov chaw khoob hauv ib daim ntaub piv rau nws qhov ntim tag nrho. Xav txog qhov no: xav txog daim txhuam cev. A dense sponge has low porosity (more solid material, less air), while a fluffy sponge has high porosity (lots of air trapped inside). Nonwovens zoo sib xws, tshwj tsis yog qhov chaw raug ntsuas hauv micrometers.

Porosity yog qhia raws li feem pua. Feem ntau cov ntaub nonwoven zaum qhov chaw ntawm 50% thiab 80% porosity, uas txhais tau hais tias lawv yog 50-80% huab cua. Rau siab - cov ntaub ntawv rwb thaiv tsev loft, tus lej ntawd tuaj yeem nce 90%. Nws yog qus thaum koj xav txog nws-koj feem ntau tuav cov cua compressed tuav ua ke los ntawm ib tug fiber ntau scaffold.

Cov mis yog ncaj nraim: sib piv ntau npaum li cas fiber ntau hauv cov ntaub tiv thaiv qhov chaw nws yuav siv li cas. Cov ntsiab lus huab cua siab dua sib npaug ntau dua porosity.

Vim li cas Porosity tseem ceeb?

Ntawm no yog qhov uas tej yam tau siv tau. Porosity ncaj qha cuam tshuam li cas nonwovens ua hauv kev siv tiag.

Rau kev pom, porosity siab dua txhais tau tias airflow zoo dua, tab sis koj yuav tsum sib npaug ntawm qhov loj ntawm qhov pores. Lub npog ntsej muag yuav tsum muaj qhov porosity txaus kom koj ua pa, tab sis lub qhov hws yuav tsum me me kom thaiv cov kab mob. Nws yog ib tug ceev faj tshuav nyiaj li cas.

Rau rwb thaiv tsev, siab porosity yog ntshaw. Cov cua daig yog cov insulator, tsis yog fiber ntau nws tus kheej. Tias yog vim li cas cov khoom siv hluav taws xob rwb thaiv tsev thiab cov khaub ncaws caij ntuj no feem ntau siv cov khoom ntxeem tau zoo heev. Cov ntaub los ua qhov tseem ceeb rau cov huab cua.

Rau kev nqus, zoo li hauv cov ntaub so huv lossis cov khoom tu tus kheej, cov porosity tswj cov kua dej nrawm npaum li cas los ntawm cov ntaub. Ib qho kev cai nonwoven ntaub so Hoobkas xav tau engineer porosity precisely kom cov kua nqus sai thiab faib tusyees yam tsis muaj pooling.

Rau kev tiv thaiv, qis porosity ua haujlwm zoo dua. Cov khaub ncaws kho mob thiab cov kev tiv thaiv kev tiv thaiv siv nruab nrab- rau- qis porosity los tiv thaiv cov kua thiab cov khoom tsis dhau los.

Dab tsi Tswj Porosity?

Cov neeg tsim khoom tsis tsuas yog stumble rau hauv ib qho porosity theem. Lawv tsim nws los ntawm ntau qhov kev xaiv tseem ceeb.

Txoj kev Bonding yog qhov loj tshaj plaws. Yog tias koj rab koob - xuas nrig ntaus ib qho nonwoven- lus stabbing nws nrog barbed koob rau entangle fibers -koj tau txais ib tug heev fluffy, ntxeem tau ntaub (93-97% porosity). Yog tias koj siv thermal bonding (kub thiab siab), cov ntaub yuav ntau compact thiab tsawg ntxeem tau. Tshuaj adhesives los yog tshuaj tsuag bonding poob qhov chaw nyob nruab nrab.

Npuag qhov hnyav ( ntsuas hauv grams ib square meter) yog lwm qhov tseem ceeb tswj. Ntau cov khoom ntim rau hauv tib qhov chaw txhais tau tias qis porosity. Nws yog lej yooj yim.

Fiber hom tseem ceeb heev. Polyester, polypropylene, paj rwb, thiab rayon txhua tus muaj cov khoom sib txawv. Cov fibers zoo dua tuaj yeem ntim txawv dua li cov tawv tawv. Txoj kev fibers npaj thaum lub sij hawm tsim khoom-txawm lawv nyob nraum carded, spunbonded, los yog airlaid- kuj cuam tshuam rau qhov pib porosity.

Kub, siab, thiab ceev thaum tsim khoom zoo - kho qhov kawg tshwm sim. Qhov no yog vim li cas cov neeg tsim khoom tsis zoo ua tib zoo tswj cov kev txwv no.

Lub Surprise: Porosity Tsis Qhia Tag Nrho Zaj Dab Neeg

Nov yog ib yam dab tsi nthuav uas ua rau neeg mus ncig. Ob lub nonwovens nrog tib qhov porosity feem pua ​​tuaj yeem ua qhov sib txawv kiag li.

Vim li cas? Vim tias porosity tsuas ntsuas tag nrho qhov chaw khoob. Nws tsis qhia koj txog qhov pore loj lossis qhov pores txuas zoo npaum li cas. Ib daim ntaub yuav yog 75% ntxeem tau nrog tons ntawm me me, tortuous pores uas txwv airflow, thaum lwm 75% porous ntaub muaj loj, ncaj pores uas cia cua ntws yooj yim.

Rau kev ua haujlwm pom, qhov nruab nrab qhov pore loj feem ntau tseem ceeb tshaj qhov porosity tag nrho. Rau thermal rwb thaiv tsev, porosity yeej. Rau huab cua permeability hauv cov khoom sib xyaw, qhov ntom ntom qee zaum tseem ceeb tshaj qhov porosity ib leeg.

Qhov no yog vim li cas engineers ntsuas porosity los ntawm ntau txoj hauv kev -kua porosimetry, capillary flow, duab tsom xam- kom nkag siab tsis yog qhov chaw khoob muaj pes tsawg, tab sis qhov chaw ntawd yog li cas.

Tiag -Tus lej ntiaj teb

Standard nonwoven fabrics feem ntau tsaws hauv 74-79% porosity ntau. Kev kho mob-qib nonwovens feem ntau pawg nyob ib ncig ntawm 70-85%. Cov ntaub ntawv rwb thaiv tsev thawb mus rau 90% lossis ntau dua.

Cov no tsis yog tus lej random. AWeston Nonwoven Hoobkastsimnonwovensrau cov ntawv thov tshwj xeeb ua tib zoo tsom rau cov kab no txhawm rau txhawm rau txhawm rau ua haujlwm tau zoo. Cov porosity siab dua rau kev ua pa, qis porosity rau kev tiv thaiv kev tiv thaiv- nws yog ib qho kev xaiv engineering.

Daim ntawv thov kev muaj tiag

Hauv kev xyaum, kev lag luam sib txawv optimize porosity txawv.

Cov tuam txhab lim dej (cov lim cua, cov lim dej) tsim cov porosity nyob ib ncig ntawm 70-80% ua ke nrog cov pore qhov ntau thiab tsawg rau lawv cov phiaj xwm. Cov neeg tsim hluav taws xob tau nce siab dua, feem ntau 80-95%, kom ua kom muaj huab cua zoo tshaj plaws. Cov neeg tsim khoom nqus dej siv 75-85% txhawm rau ua kom cov kua nqus tau sai thiab kev faib tawm.

Cov cuab yeej kho mob thiab kev tiv thaiv sib npaug ntau yam kev xav tau. Koj xav kom txaus porosity rau kev nplij siab thiab breathability, tab sis tsis ntau npaum li ntawd cov ntaub yuav ib tug sieve. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau cov ntaub so ntswg thiab cov khoom siv tu qhov chaw uas koj xav tau lub zog, absorbency, thiab kav ntev ib zaug.

Cov Tradeoffs

Txhua qhov kev xaiv porosity suav nrog kev sib pauv. Cov ntaub ntxeem tau ntau dua (koj siv cov khoom siv tsawg) tab sis tsis muaj zog thiab muaj kev tiv thaiv tsawg dua. Cov ntaub npuag tsawg dua muaj zog thiab tiv thaiv ntau dua tab sis txwv tsis pub ntws thiab kim dua los tsim. Cov ntaub ntxeem tau ntau dua nyiam dua tab sis muaj kev tiv thaiv tsawg dua. Cov neeg tsim qauv taw qhia cov kev ntxhov siab no txhob txwm ua raws li qhov tseem ceeb tshaj plaws rau daim ntawv thov tshwj xeeb.

Saib rau pem hauv ntej

Raws li cov tuam txhab tsim cov khoom siv siab heev thiab thawb mus rau kev ruaj ntseg, kev nkag siab txog kev tswj porosity yuav tseem ceeb dua. Cov txheej txheem kev suav tshiab tam sim no tuaj yeem kwv yees porosity los ntawm cov khoom fiber ntau thiab kev tsim khoom ua ntej txhua yam tau ua. Qhov no txav nonwoven tsim los ntawm kev sim - thiab - yuam kev mus rau precision engineering.