Chabwino, tiyeni tifotokoze mwatsatanetsatane mfundo ya kusintha kwa elastomer kuti tiwongolere kulimba kwaspunbond nsalu zopanda nsalu. Ichi ndi chitsanzo chakuchita bwino kwambiri mwa "kukulitsa mphamvu ndi kuchepetsa zofooka" kudzera mumagulu azinthu.
Malingaliro Apakati: Kulimba vs. Brittleness
Choyamba, tiyeni timvetse "kuuma." Kulimba mtima ndi kuthekera kwazinthu kuyamwa mphamvu ndikusintha mapulasitiki mpaka kusweka ndi kupsinjika. Chida chokhala ndi kulimba bwino chimakhala champhamvu komanso cholimba, chomwe chimafuna ntchito yochuluka kuti chiphwanyike.
Zida za Brittle (monga polypropylene yosasinthika): Pansi pa mphamvu yakunja, maunyolo a molekyulu alibe nthawi yokonzanso, kupsinjika kumayang'ana pa zolakwika, zomwe zimatsogolera kusweka mwachangu komanso kutsika pang'ono panthawi yopuma.
Zida zolimba: Pansi pa mphamvu yakunja, zimatha kutulutsa ndikudutsa ma pulasitiki, kuwononga mphamvu zambiri pochita izi, motero kukana kusweka.
Cholinga chachikulu cha kusintha kwa elastomer ndikusintha ma polima a semi-crystalline ngati polypropylene kuchoka ku brittle fracture kupita ku ductile fracture.
Mfundo Zatsatanetsatane za Kusintha kwa Elastomer
Mfundoyi ingathe kumveka kuchokera kumagulu ang'onoang'ono komanso aakulu. Pakatikati pamakhala tinthu tating'onoting'ono ta elastomer tomwe timakhala ngati malo olimbikira komanso zotengera mphamvu.
1. Microscopic Mechanical Mechanism: Kulowetsa ndi Kuthetsa Kupenga, Kupititsa patsogolo Kukolola kwa Shear.
Iyi ndiye mfundo yofunika kwambiri. Nsalu ya spunbond ikagwidwa ndi mphamvu zakunja (monga kung'ambika kapena kukhudzidwa), zotsatirazi zimachitika mkati:
a) Kukhazikika kwa Kupsinjika ndi Kuyambitsa Kupenga
Ma Elastomers (monga EPDM, POE) nthawi zambiri samagwirizana kapena amagwirizana pang'ono ndi matrix a polypropylene. Choncho, atatha kusakaniza, amagawidwa ngati tinthu tating'ono tating'ono ta "chilumba" chomwazika mkati mwa gawo lopitilira la "nyanja" la polypropylene.
Popeza kuti modulus ya elastomer ndi yotsika kwambiri kuposa ya polypropylene, kupanikizika kwakukulu kumapezeka pamawonekedwe apakati pa magawo awiriwa pamene akugonjetsedwa ndi mphamvu zakunja.
Ma stress concentration awa amakhala malo oyambilira kusweka. Crazing si mng'alu, koma ndi microporous CHIKWANGWANI mtolo kapangidwe perpendicular kwa maganizo malangizo, olumikizidwabe mkati ndi polima ulusi. Mapangidwe a misala amatenga mphamvu zambiri.
b) Crazing Termination ndi Shear Band Mapangidwe
Gawo lachiwiri lofunikira la tinthu tating'ono ta elastomer ndikuthetsa kupenga. Chidwi chikakumana ndi tinthu tating'ono ta elastomer panthawi yomwe ikufalikira, kupsinjika kwakukulu kumasokonekera, kulepheretsa kulakalaka kukhala ming'alu yakupha.
Nthawi yomweyo, kupsinjika kumapangitsanso kumeta ubweya mu polypropylene matrix. Izi zikutanthawuza kutsetsereka kwachibale ndi kukonzanso kwa unyolo wa polypropylene molekyulu pansi pa kumeta ubweya wa ubweya, kupanga magulu ometa ubweya; ndondomekoyi imafunanso mphamvu zambiri.
c) Synergistic Energy Dissipation Mechanism
Pamapeto pake, mphamvu yogwiritsidwa ntchito kunja imatayidwa makamaka kudzera m'njira zotsatirazi:
Kupanga zolakalaka zambiri: kugwiritsa ntchito mphamvu.
Kusintha ndi kusweka kwa ma elastomer particles okha: kugwiritsa ntchito mphamvu.
Kumeta ubweya wa matrix: kugwiritsa ntchito mphamvu.
Kuphatikizana kwapakati: tinthu tating'onoting'ono ta elastomer tomwe timatulutsa kuchokera ku matrix, kugwiritsa ntchito mphamvu.
Izi zimawonjezera kwambiri ntchito yofunikira pakusweka kwa zinthu, kuwonetseredwa mokulirapo ngati kusintha kwakukulu kwamphamvu yamphamvu ndi kukana misozi, komanso kumawonjezera elongation panthawi yopuma.
2. Kusintha kwa Mapangidwe a Gawo: Kukhudza Makhalidwe a Crystallization
Kuwonjezera kwa elastomers sikumangogwira ntchito ngati "chowonjezera" komanso kumakhudza microstructure ya polypropylene.
Kuyeretsa ma Spherulites: Tinthu tating'onoting'ono ta Elastomer titha kukhala ngati malo osasinthika, ndikusokoneza dongosolo la ma cell a polypropylene ndikupangitsa kuti aziwoneka bwino kwambiri, zolimba kwambiri za spherulite.
Kupititsa patsogolo Chiyankhulo: Pogwiritsa ntchito zogwirizanitsa, kulumikizana kwapakati pakati pa elastomer ndi polypropylene matrix kungawongoleredwe, kuwonetsetsa kuti kupsinjika kumatha kusamutsidwa bwino kuchokera ku matrix kupita ku tinthu tating'onoting'ono ta elastomer, potero kumapangitsa kuti zilakolako ndi kukameta ubweya zitheke.
Kugwiritsa Ntchito Mwachindunji mu Spunbond Nonwoven Fabric Production
Kugwiritsa ntchito mfundo zomwe zili pamwambazi popanga nsalu za spunbond nonwoven zimakhala ndi zotsatirazi:
Kulimbitsa Kulimbitsa Kwa Ma Fiber Payekha:
Panthawi yopota, kusungunuka kwa polypropylene komwe kumakhala ndi elastomers kumatambasulidwa kukhala ulusi. Ulusi wosinthidwawo umakhala wolimba. Pansi pa mphamvu yakunja, ulusiwu suchedwa kusweka ndipo ukhoza kusokoneza kwambiri pulasitiki, kutengera mphamvu zambiri.
Kulimbitsa ndi Kulimbitsa kwa Fiber Network Structure:
Pakuwotcha kulimbikitsana, ulusiwo umalumikizana pamalo ogubuduza. Ulusi wokhala ndi kulimba bwino sungathe kusweka nthawi yomweyo pamene akugudubuza pamene akung'ambika.
Mphamvu zakunja zitha kugawidwanso moyenera mu network yonse ya fiber. Ulusi ukakhala ndi nkhawa kwambiri, ukhoza kusamutsa kupsinjika kwa ulusi wozungulira kudzera mukusintha, kupewa kulephera mwachangu komwe kumachitika chifukwa cha kupsinjika.
Kudumpha patsogolo pakugwetsa misozi ndi kukaniza:
Kukaniza misozi: Kung'amba ndi njira yofalitsa ming'alu. Tinthu tating'onoting'ono ta Elastomer timayambitsa ndikuthetsa ma microcracks ambiri, kuwateteza kuti asagwirizane ndi ming'alu ya macroscopic, ndikuchepetsa kwambiri kung'ambika.
Kukaniza kubowola: Kubowola ndi kuphatikiza kovutirapo komanso kung'ambika. Zida zolimba kwambiri zimatha kulolera mozama ndikupindika pamene chinthu chachilendo chiboola, kutsekereza chinthucho m'malo moboola mwachindunji.
Mapeto
Mwachidule: Mfundo yosinthira elastomer kuti ikhale yolimba ya ma spunbond nonwovens kwenikweni ndi kuphatikiza matrix olimba koma osalimba a polypropylene ndi mphira wofewa, wonyezimira kwambiri, kupanga njira yabwino yochotsera mphamvu mkati mwazinthuzo.
Mwa kuchititsa misala, kuthetsa ming'alu, ndi kulimbikitsa kumeta ubweya pogwiritsa ntchito makina a microscopic, mphamvu zowononga (zowonongeka, zowonongeka) zomwe zimagwiritsidwa ntchito kunja zimasinthidwa kukhala ntchito yochepetsetsa yaying'ono, yosawononga. Izi zimakulitsa kukana kwa zinthu zakuthupi, kukana kung'ambika, komanso kutalika kwa nthawi yopuma, kusintha nsalu za spunbond zosawomba kuchokera ku "zosalimba" kupita ku "zolimba." Izi ndizofanana ndi kuwonjezera zitsulo zachitsulo ku simenti, zomwe sizimangowonjezera mphamvu koma, chofunika kwambiri, zimapereka kulimba kofunikira.
Dongguan Liansheng Non Woven Technology Co., Ltd.idakhazikitsidwa mu Meyi 2020. Ndi bizinesi yayikulu yopanda nsalu yopanga nsalu kuphatikiza kafukufuku ndi chitukuko, kupanga, ndi malonda. Itha kupanga mitundu yosiyanasiyana ya nsalu za PP spunbond zosalukidwa ndi m'lifupi mwake osakwana 3.2 metres kuchokera pa 9 magalamu mpaka 300 magalamu.
Nthawi yotumiza: Nov-16-2025