Polypropylene yaj tshuab tsis-woven npuag ntau lawm
Melt tshuab nonwoven ntaub
Txheej txheem cej luam
Kev siv sib txawv lossis qib ntawm lub ntsej muag tiv thaiv thiab khaub ncaws siv cov ntaub ntawv sib txawv thiab cov txheej txheem kev npaj, raws li qib siab tshaj plaws ntawm lub ntsej muag tiv thaiv kev kho mob (xws li N95) thiab cov khaub ncaws tiv thaiv, peb mus rau tsib txheej ntawm cov ntaub tsis-woven, xws li SMS lossis SMMMS ua ke.
Qhov tseem ceeb tshaj plaws ntawm cov cuab yeej tiv thaiv no yog txheej txheej thaiv, uas yog yaj-tshuab tsis-woven txheej M, fiber ntau txoj kab uas hla ntawm txheej yog qhov zoo, 2 ~ 3μm, nws ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv kev nkag mus ntawm cov kab mob thiab cov ntshav. . Cov ntaub microfiber qhia tau hais tias zoo lim, huab cua permeability thiab adsorbability, yog li nws yog dav siv nyob rau hauv cov ntaub ntawv pom, thermal cov ntaub ntawv, kev kho mob tu cev thiab lwm yam teb.
Polypropylene yaj tshuab tsis-woven npuag ntau lawm tshuab thiab txheej txheem
Melt tshuab uas tsis yog-woven npuag txheej txheem ntau lawm yog feem ntau polymer resin hlais pub → yaj extrusion → yaj impurity pom → metering twj raug metering → spinet → mesh → ntug winding → khoom ua.
Lub hauv paus ntsiab lus ntawm melting txheej txheem yog extrude polymer yaj los ntawm lub spinneret lub taub hau tuag los ua ib tug nyias ntws ntawm yaj. Nyob rau tib lub sijhawm, cov cua kub ceev thiab siab kub ntws ntawm ob sab ntawm lub qhov spinet txau thiab ncab cov kwj deg, uas tom qab ntawd ua kom zoo rau hauv cov filaments nrog kev nplua ntawm tsuas yog 1 ~ 5μm. Cov filaments no ces rub mus rau luv fibers ntawm li 45mm los ntawm thermal flow.
Txhawm rau tiv thaiv cov huab cua kub los ntawm tshuab lub luv fiber ntau sib nrug, lub tshuab nqus tsev nqus tau teeb tsa (hauv qab coagulation screen) kom sib npaug sib sau cov microfiber tsim los ntawm cov cua kub ceev nrawm. Thaum kawg, nws tso siab rau nws tus kheej-nplaum los ua cov ntaub nplaum uas tsis yog cov ntaub.
Main txheej txheem parameter:
Cov khoom ntawm cov khoom siv polymer: suav nrog cov khoom siv rheological ntawm cov khoom siv raw, cov hmoov tshauv, cov txheeb ze molecular loj faib, thiab lwm yam. Ntawm lawv, rheological khoom ntawm raw cov ntaub ntawv yog qhov tseem ceeb tshaj plaws Performance index, feem ntau hais los ntawm melting index (MFI). Qhov loj dua MFI, qhov zoo dua qhov melt fluidity ntawm cov khoom, thiab vice versa. Qhov qis dua qhov hnyav molecular ntawm cov khoom siv cob, qhov MFI siab dua thiab qis dua cov viscosity yaj, qhov tsim nyog rau cov txheej txheem yaj yaj nrog cov txheej txheem tsis zoo. Rau polypropylene, MFI yuav tsum nyob rau hauv thaj tsam ntawm 400 ~ 1800g / 10mIN.
Nyob rau hauv tus txheej txheem ntawm melt blowout ntau lawm, cov tsis kho raws li qhov kev thov ntawm raw cov ntaub ntawv thiab cov khoom mas muaj xws li:
(1) Melt extrusion kom muaj nuj nqis thaum qhov kub thiab txias tsis tu ncua, extrusion kom muaj nuj nqis, cov yaj uas tsis muaj ntaub ntawv ntau ntxiv, thiab lub zog nce (qis tom qab ncav cuag tus nqi siab). Nws txoj kev sib raug zoo nrog cov kab fiber ntau linearly nce, tus nqi ntawm extrusion ntau dhau, fiber ntau txoj kab uas hla nce, lub hauv paus tus naj npawb txo thiab lub zog txo, qhov kev sib txuas yog txo qis, ua rau thiab txhob lo lo ntxhuav, yog li cov txheeb ze lub zog ntawm cov ntaub tsis-woven txo. .
(2) qhov kub ntawm txhua cheeb tsam ntawm cov ntsia hlau tsis yog tsuas yog cuam tshuam rau smoothness ntawm cov txheej txheem spinning, tab sis kuj cuam tshuam rau cov tsos, xav thiab kev ua tau zoo ntawm cov khoom. Qhov kub thiab txias heev, yuav muaj "SHOT" thaiv cov polymer, cov ntaub ntawv tsis xws luag nce, tawg fiber ntau, tshwm sim "ya". Kev ntsuas kub tsis zoo yuav ua rau muaj kev thaiv ntawm lub taub hau lub taub hau, hnav tawm lub qhov spinneret, thiab ua rau lub cuab yeej puas.
(3) Stretch cua kub kub Stretch cua kub kub yog feem ntau qhia los ntawm kub cua tshaj tawm (siab), muaj ib tug ncaj qha cuam tshuam rau lub fineness ntawm fiber. Nyob rau hauv cov ntaub ntawv ntawm lwm yam tsis zoo ib yam, nce qhov ceev ntawm huab cua kub, fiber ntau thinning, fiber ntau nce, uniform quab yuam, lub zog nce, tsis-woven xav yuav mos thiab du. Tab sis qhov ceev yog loj heev, yooj yim tshwm sim "ya", cuam tshuam cov tsos ntawm cov ntaub tsis-woven; Nrog rau qhov txo qis ntawm qhov nrawm, qhov porosity nce, qhov pom tsis kam txo, tab sis qhov pom kev ua haujlwm tsis zoo. Nws yuav tsum tau muab sau tseg tias qhov kub ntawm huab cua kub yuav tsum nyob ze rau lub melting kub, txwv tsis pub airflow yuav raug generated thiab lub thawv yuav puas.
(4) Melt kub Melt kub, tseem hu ua yaj lub taub hau kub, yog ze ze rau yaj fluidity. Nrog rau qhov kub thiab txias, lub yaj fluidity yuav zoo dua, lub viscosity txo, cov fiber ua finer thiab cov uniformity yuav zoo dua. Txawm li cas los xij, qhov qis dua qhov viscosity, qhov zoo dua, tsis tshua muaj viscosity, yuav ua rau ntau dhau, fiber ntau yooj yim tawg, tsim ntawm ultra-luv microfiber ya saum huab cua tsis tuaj yeem sau.
(5) Tau txais qhov nrug deb (DCD) yog hais txog kev ncua deb ntawm lub spinneret thiab cov ntaub thaiv npog. Qhov kev ntsuas no muaj kev cuam tshuam tshwj xeeb rau lub zog ntawm fiber ntau mesh. Nrog rau qhov nce ntawm DCD, lub zog thiab dabtsi yog khoov rigidity txo, lub fiber txoj kab uas hla yuav txo, thiab qhov sib txuas taw tes txo. Yog li ntawd, cov ntaub ntawv uas tsis yog-woven yog mos thiab fluffy, lub permeability nce, thiab pom kuj thiab pom efficiency txo. Thaum qhov kev ncua deb loj dhau lawm, cov cua ntsawj ntshab ntawm cov fiber ntau yog txo los ntawm cov cua kub ntws, thiab cov entanglement yuav tshwm sim ntawm cov fibers nyob rau hauv tus txheej txheem ntawm kev tsim, uas ua rau filaments. Thaum qhov tau txais kev ncua deb me me dhau lawm, cov fiber ntau tsis tuaj yeem ua kom txias, ua rau cov xaim, cov ntaub tsis-woven lub zog txo, brittleness nce.
