Kutulutsa kwa pulasitiki kwa chubu, payipi ndi chitoliro ndi njira yokhazikika yosinthira zinthu zopangira thermoplastic kukhala chinthu chomaliza kapena chomwe chatsala pang'ono kumaliza.Zopangira nthawi zambiri zimakhala ngati mapepala apulasitiki kapena ufa.Kutembenuka kumachitika ndi kupanga homogeneous osungunula misa mu extruder ndi kukakamiza pansi pa mavuto kudzera extrusion kufa orifice kuti limafotokoza mawonekedwe a mankhwala gawo mtanda.Zomwe zimapangidwa, kapena extrudate, zimakhazikika ndikukokedwa kutali ndi kutuluka kwakufa pamlingo woyendetsedwa.Extrudate imatha kuvulazidwa pa spool, kudula mpaka kutalika kwake, kapena kuwongolera munjira ina ya mzere.
Mosiyana ndi kuumba jekeseni kapena kuwomba, zomwe ndi njira zozungulira, extrusion ndi njira yokhazikika.Kukhazikika kokhazikika kumeneku kumabweretsa zopindulitsa ndi zovuta zina zapadera monga njira yopangira.Zogulitsa zowonjezera zimakhala zazitali kwambiri komanso zopitilira, ndipo zimakhala ndi gawo lomwe nthawi zambiri limakhala lokhazikika pokhudzana ndi olamulira kapena njira yopangira.Zopangidwa ndi jekeseni ndi zinthu zodziwikiratu zomwe zimakhala ndi magawo osiyanasiyana pamzere uliwonse.Mfundo yakuti extrusion ya chubu, payipi ndi chitoliro ndi ndondomeko yokhazikika idzakambidwa m'madera ambiri a nkhaniyi.Mawu omwe amagwiritsidwa ntchito pofotokozera chubu, payipi ndi chitoliro amasiyana kuchokera ku mafakitale kupita ku mafakitale.
Zida
Zigawo zikuluzikulu za chubu, payipi, kapena chitoliro extrusion dongosolo nthawi zambiri amagawidwa mu zigawo kumtunda kwa extruder, extruder palokha, ndi amene ali pansi pa mtsinje extruder.Zigawo za kumtunda zimaphatikizapo zida zogwiritsira ntchito utomoni wotumizira zinthuzo ku extruder, ndi zida zopangira utomoni zomwe zimatenthetsera utotowo, kapena kuwongolera chinyezi chautomoni usanalowe pakhosi.Zomwe zili pansi pamtsinje zimaphatikizira fyuluta yosungunuka ya utomoni kapena chosinthira chophimba, cholumikizira chakufa cha extrusion, chozimitsa kapena thanki ya vacuum sizing, zida zilizonse zoyezera zinthu, chowongolera liwiro la mzere wotuluka ngati chokoka lamba kapena seti ya nip roll, ndipo pamapeto pake chinthu. chipangizo chodulira kapena chomangira.Palinso njira zowonjezera zowonjezera zomwe zidzatengere mankhwala otulutsidwa mwachindunji mu ndondomeko ina ya mzere kuti awonjezere kulumikiza kowonjezera kapena kuwonjezera zokutira zina kapena zigawo za utomoni.
Zipangizo
Njira zowonjezera zitha kugwiritsidwa ntchito pokonza ma thermoplastics ambiri ndi mapulasitiki ena a thermoset.Ma resin omwe nthawi zambiri amachotsedwa pamachubu, payipi ndi zinthu zapaipi amaphatikiza polyethylene yapamwamba komanso yotsika, polypropylene, polyurethane, polystyrene, fluoropolymers, PTFE, polyester, ndi PVC yosinthika komanso yolimba.Chikhalidwe chomwe nthawi zambiri chimasiyanitsa utomoni wotuluka kuchokera ku utomoni wopangidwa ndi jekeseni ndi kusungunuka kwa mamasukidwe apulasitiki pamatenthedwe abwinobwino.Mapulasitiki owonjezera nthawi zambiri amakhala ndi kusungunuka kwapamwamba kwambiri, zomwe zimathandiza kuti extrudate ikhalebe ndi mawonekedwe omwe amaperekedwa ndi imfa pamene extrudate ili m'magawo ozima.Zowonjezera zambiri zitha kugwiritsidwa ntchito panthawi ya extrusion kuti mupititse patsogolo mawonekedwe a polima kapena kusintha katundu.Zowonjezera zotere zimaphatikizapo mafuta, zolimbitsa thupi, ma antioxidants, ma radiopacifying agents, ndi ma colorants.
Processing Parameters
Zofunikira pakukonza extrusion ndizofanana ndi njira zopangira jakisoni.Kutentha kwa utomoni, kuthamanga kwa utomoni, kusungunuka kwa utomoni, kuthamanga kwa screw, ndi screw motor amperage nthawi zambiri zimayendetsedwa kapena kuyang'aniridwa kuti zipereke kusungunuka kofanana pamlingo wolamulidwa.Kutentha kozimitsa ndi mlingo womwe extrudate imakokedwa imayendetsedwa kapena kuyang'aniridwa kuti ipereke kukula kwa mankhwala olamulidwa.Miyezo ya kukula, pogwiritsa ntchito njira zosiyanasiyana zoyezera, imatha kutengedwa kuchokera ku extrudate momwe imapangidwira.Mosiyana ndi jekeseni akamaumba, extrusion akhoza zosiyanasiyana kukula kwa chomaliza popanda kusintha kufa tooling.Kulekerera kwapang'onopang'ono kwapang'onopang'ono kapena kusasinthika kwazinthu kumakhala mkati mwa 1% ya mtengo womwe umayezedwa mwadzina.Popeza njira zopangira izi zimaphatikizapo kukhazikika kwanthawi zonse, chilichonse chomwe chingakhazikitse gawo lililonse kapena chikhalidwe chimakhala chopindulitsa pakuchitapo kanthu.
Nthawi yotumiza: May-09-2017