Polima ikasungunuka, kusakaniza ndi kukakamizidwa mu extruder, imapopedwa kudzera mukufa kwa extrusion kuti ipangidwe mosalekeza (pambuyo pozizira ndi kulimba) kukhala chinthu chomaliza.Mitundu yodziwika bwino ya kufa ndi yafulati, annular ndi proŽle.Zopangidwa ndi extrusion ndi monga chitoliro, machubu, zokutira mawaya, mabotolo apulasitiki, mafilimu apulasitiki ndi mapepala, zikwama zapulasitiki, zokutira za mapepala ndi zojambulazo, Ž bres, Ž kulira, ulusi, matepi ndi mndandanda wambiri wamafayilo.
Polima extrusion kudzera kufa ali ndi zofanana ndi otentha extrusion zitsulo.Muzitsulo zowonjezera zinthuzo zimakankhidwa kutsogolo ndi nkhosa yamphongo, pamene polima extrusion zinthuzo zimaperekedwa mosalekeza ndi screw yozungulira.Muzitsulo zotentha zachitsulo kutentha kumachokera ku 340 ° C kwa magnesium kufika ku 1325 ° C kwa chitsulo, ndipo zovuta zofanana zimachokera ku 35 mpaka kupitirira 700 MPa.1 5 Mu polymer extrusion kutentha sikumapitirira 350 ° C, ndipo zovuta nthawi zambiri sizimadutsa. kupita kwambiri kuposa 50 MPa pa nsonga wononga.Olimba gawo extrusion wa ma polima lapangidwa kwa kupanga zina mkulu mphamvu products.At kutentha otsika, ndi maselo lolunjika pa kukakamiza zinthu kudzera mukuumba kufa amakhalabe mu extrudate.Solid state polymer extrusion imakhala ndi zofanana ndi kuzizira kwazitsulo.
Wowombedwa filimu extrusion ndi njira yofunika kwambiri kwa kupanga woonda pulasitiki Žfilms kuchokera polyethylenes.Polima wosungunuka ndi extruded kudzera annular kufa (kawirikawiri wa ozungulira mandrel zomangamanga) kupanga woonda mipanda chubu amene nthawi imodzi axially kukokedwa ndi radially kukodzedwa.Nthawi zambiri, kuwira kwa filimu kumapangidwa molunjika mmwamba.The pazipita kuwira diameters zambiri 1.2 - 4 kuwirikiza kuwirikiza kufa kwake.Kusungunuka kotentha kumatsitsidwa ndi mitsinje ya annular ya mpweya wothamanga kwambiri kuchokera ku mphete zakunja za mpweya, komanso nthawi zina kuchokera kwa ogawa mpweya mkati.SoldiŽ ed Žfilm imadutsa pa chimango chomwe chimatsina pamwamba pa thovulo ndipo chimatengedwa ndi odzigudubuza.Mafilimu ophatikizika a Žfilm okhala ndi zigawo 3 - 8 (nthawi zina mpaka 11) amapangidwanso ndi njirayi, kuti agwiritsidwe ntchito popanga chakudya.
Kutulutsa filimu ndi ma sheet extrusion kumaphatikizapo kutulutsa polima kupyola pa fayi ndi kutsegula kwakukulu (mpaka 10 m), pa chopukusira chachitsulo chozizira kapena zodzigudubuza zomwe zimazimitsa ndi kulimbitsa zinthu zosungunuka.Kanemayo amatanthauzidwa ngati chinthu chochepa kwambiri kuposa 0.25 mm, pomwe pepala ndi lalitali kuposa izi. Njira yopangira Žfilm imagwiritsidwa ntchito pakulolera kolimba kwambiri kwa filimu ya thinŽ, kapena utomoni wocheperako.Zofa zambiri zathyathyathya ndizopangidwa ndi T slot kapena coathanger, zomwe zimakhala ndi zochulukira kuti zifalitse polima mozungulira m'lifupi mwake, ndikutsatiridwa kunsi kwa mtsinje ndikusinthira mipata yopapatiza komanso yotseguka kuti ipangitse kugawa komwe kumafunikira komanso kutsika kwamphamvu.Makanema ambiri omwe amapangidwa masiku ano ndi mizere yolumikizana, kuphatikiza magawo asanu ndi awiri opitilira muyeso kudzera mu kufa kosiyanasiyana, kapena manifold angapo amafa mothandizidwa ndi feedblocks.
Mu Žfilm extrusion, mitengo yometa ubweya pamilomo yakufa nthawi zambiri imakhala ~103 s21.Pamene kumeta ubweya wa khoma kupanikizika kumaposa mtengo wina (kawirikawiri 0.14 MPa m'mapepala ofufuza, apamwamba m'makampani mothandizidwa ndi zowonjezera), pamwamba pa extrudate imataya kuwala kwake chifukwa cha kuphulika kwa sharkskin kusungunuka. zowoneka ndi maso, perpendicular kwa otaya malangizo.
Kutulutsa kwa mapaipi ndi machubu kumaphatikizapo kupopera polima wosungunuka kudzera mwaanannulardie, motsatira zomwe chinthu chotuluka, pamene chikukokedwa, chimadutsa pa vacuum sizer pomwe chimafikira miyeso yake yomaliza.Izi zimatsatiridwa ndi kupopera kapena kumiza kuziziritsa ndi kudula mpaka utali wokhazikika.Chitoliro cha m'mimba mwake mpaka 2 m kapena kuposerapo chimapangidwa ndi njirayi, ndi machubu okhala ndi ma diameter kuchokera 10 mm mpaka pansi pa 1 mm.The annular dies nthawi zambiri amapangidwa ndi kangaude kapena spiral mandrel.
Mu njira zokutira mawaya ndi chingwe, mawaya amunthu kapena mawaya amakokedwa pa liwiro lalikulu kwambiri kudzera pamafa opingasa, pamakona abwino kupita ku oxis extruder.Mu high pressure extrusion, polima amasungunuka amakumana ndi waya kapena chingwe pamaso pa kufa, mwachitsanzo insulating wa mawaya payekha.Pakuthamanga kwapansi, kusungunula kumakumana ndi chingwe pambuyo potuluka, mwachitsanzo kuyika ma jekete amagulu a zingwe zotsekedwa.Mitengo yometa ubweya wambiri nthawi zambiri imakumana ndi izi (mpaka 106 s2 1) ndipo ma resins otsika amagwiritsidwe ntchito.
ProŽfile extrusion ndi njira yopangira zinthu zomwe zimagwiritsidwa ntchito popanga magawo osiyanasiyana.Izi zitha kukhala kuchokera ku mawonekedwe osavuta mpaka mbiri yovuta kwambiri yokhala ndi zipinda zingapo ndi Žzala.Zitsanzo kuyambira pamapangidwe azithunzi, mpaka kukonza magalimoto, mpaka pamizere yamapiritsi, mpaka pamizere yamawindo.Zida zowonjezera zimagawidwa (pafupifupi) ngati zolimba kapena zokhazikika.Mzere wamtundu wa proŽle extrusion umakhala ndi chopopera chopopera polima kupyola pa fakitale ya proŽle, kutsatiridwa ndi thanki yoyezera kapena calibrator, miyendo yowonjezera yozizira, chokoka ndi chodulira.Mapangidwe a mbiri amafa amafuna kudziwa zambiri komanso kuleza mtima. Zolepheretsa pakutulutsa mbiri amakumana nazo chifukwa cha chikopa cha shark (pazinthu zoonda kwambiri zopangidwa ndi ma polima owoneka bwino) kapena kuziziritsa zinthu zokhuthala zokhala ndi mipanda.Polima chitoliro ndi proŽfile extrusion ndi ofanana ndi otentha extrusion zitsulo kupanga mosalekeza dzenje akalumikidzidwa zinthu barlike.Komabe, masamu mafanizo a zitsulo izi zimachokera makamaka pa zotanuka - pulasitiki otaya hypotheses.
Pakuzungulira kosungunuka, polima wosungunuka amalowa m'mapilari ambiri mu spinneret (mpaka 1000).Polimayo amaperekedwa mopanikizika ndi mpope wa gear kuti ayese metering yolondola, atadutsa Ž lter yomwe imatsatira extruder.Potuluka m'ma capillaries, Ž amadandaula amachepetsedwa kufika m'mimba mwake yomwe akufuna.Pochita izi ma Ž bres amachepetsedwa ndi mphamvu yokoka yomwe imayendetsedwa ndi ndege yothamanga kwambiri.
Nthawi yotumiza: Apr-19-2017