Cov txheej txheem yaj-tshuab yog txheej txheem tsim tshwj xeeb siv los tsim cov fibers zoo thiab cov ntaub tsis-woven los ntawm polymer resins. Nws yog dav siv nyob rau hauv kev lag luam xws li pom, kev kho mob, thiab tsheb rau nws lub peev xwm los tsim cov ntaub ntawv nrog cov khoom tshwj xeeb, nrog rau kev pom zoo, kev ua haujlwm tsis zoo, thiab kev nqus dej. Ntawm no yog ib qho kev piav qhia ntawm cov txheej txheem melt-blown:
Kev xaiv Polymer: Cov txheej txheem pib nrog kev xaiv cov khoom siv polymer uas tsim nyog, feem ntau yog cov thermoplastic polymer xws li polypropylene (PP), polyethylene (PE), lossis polyester (PET). Kev xaiv ntawm polymer nyob ntawm qhov xav tau ntawm cov khoom kawg.
Melting: Cov khoom siv polymer uas tau xaiv yog yaj mus rau lub xeev ua kua hauv ib qho extruder lossis yaj-tshuab tuag. Cov cob yog rhuab mus rau nws melting point thiab yuam los ntawm ib tug series ntawm me me nozzles los yog spinnerets rau nyias, nruam filaments.
Extrusion thiab stretching: Lub molten polymer yog extruded los ntawm cov spinnerets ntawm siab tshaj tawm, tsim zoo kwj ntawm kua polymer. Raws li cov kwj tawm ntawm cov spinnerets, lawv raug rau cov cua kub ceev lossis roj ntws, uas ncab thiab ua kom cov filaments rau hauv fiber ntau zoo dua.
quenching thiab solidification: Cov stretched fibers yog sai txias thiab solidified thaum lawv taug kev los ntawm huab cua los yog roj ntws. Cov txheej txheem quenching sai no "freezes" cov fibers nyob rau hauv lawv lub xeev stretched, tiv thaiv lawv los ntawm rejoining thiab tsim loj fibers.
Sau: Cov fibers solidified yog sau rau ntawm ib txoj siv conveyor txav los yog tig nruas los tsim ib lub vev xaib ntawm randomly oriented fibers. Qhov kev ncua deb ntawm cov spinnerets thiab qhov chaw sau, nrog rau kev tshaj tawm ntawm cov huab cua lossis roj ntws, txiav txim siab qhov tuab thiab qhov ntom ntawm cov ntaub uas tsis yog ntaub.
Bonding (yeem): Hauv qee daim ntawv thov, cov ntaub yaj-tshuab tuaj yeem ua cov txheej txheem ntxiv los txhim kho nws lub zog, ruaj khov, lossis pom cov khoom. Cov kauj ruam no yuav muaj xws li thermal bonding, chemical bonding, los yog mechanical entanglement los sib sau ua ke cov fibers thiab txhim kho tag nrho cov kev ua tau zoo ntawm cov ntaub.
