Unikani njira zopangira ndi njira zinayi zazikulu zotulutsira thovu la EVA#EVA sheet extrusion

EVA ZINAWATHERA, vinyl acetate copolymer, zinthu za polymer. EVA midsole ndi yopepuka ndipo ili ndi makhalidwe abwino. Ndi chinthu chomwe chimagwiritsidwa ntchito kwambiri mu nsapato zapamwamba zopepuka, nsapato zamasewera, ndi nsapato wamba. Lero, tiphunzira za zinthu zopangira ndi njira zinayi zazikulu zopangira thovu la EVA.

1. Zinthu zokhudza njira yopangira thovu ya EVA

Fomula yopangira thovu ya EVA nthawi zambiri imakhala ndi zinthu zotsatirazi: zosakaniza zazikulu, zodzaza, zodzola thovu, zolumikizira, zolimbikitsira thovu, ndi mafuta odzola.

Zipangizo zazikulu ndi EVA kapena PE. Zachidziwikire, kuti muwongolere mawonekedwe a chinthucho, mutha kuwonjezeranso zinthu zina, monga rabara, POE (polyethylene octene co-elastomer), ndi zina zotero, ndipo mutha kuwonjezera TPR pang'ono (mtundu wa pulasitiki womwe uli ndi mawonekedwe a rabara ndi thermoplastics) kuti muwongolere mawonekedwe enaake.

Ponena za EVA, chizindikiro chachikulu ndi kuchuluka kwa VA. Mlingo wake umagwirizana mwachindunji ndi pafupifupi zonse zomwe zimapangidwa ndi thovu la EVA. Ndithudi. Ena amatha kutulutsa thovu pogwiritsa ntchito PE yokha. Zosakaniza zazikulu zomwe mungagwiritse ntchito zimadalirabe zofunikira za chinthucho.

Zodzaza, pakadali pano calcium carbonate kapena talc nthawi zambiri zimagwiritsidwa ntchito. Cholinga chake ndikuchepetsa ndalama, kuwonjezera kuuma kwa zinthu, ndi zina zotero, ndipo zimathanso kugwira ntchito pakuyendetsa kutentha. Nthawi zambiri, kukula kwa tinthu timeneti kumagwiritsidwa ntchito ngati chizindikiro cha khalidwe (ndithudi, kuchuluka kwa chinyezi ndi mbali imodzi), monga maukonde 120, maukonde 400, ndi zina zotero. Mwachidule, tinthu tating'onoting'ono timakhala bwino, koma ndithudi mtengo udzakhala wokwera. Mlingo wapamwamba kwambiri mu njira zomwe ndawona ndi 40Phr (mlingo ndi kuchuluka kwa chinthu chachikulu).

Zopangira thovu nthawi zambiri zimagwiritsidwa ntchito ngati zopangira thovu zamtundu wa AC, monga AC-3000H. Zopangira thovu zamtundu wa AC ndi zopangira thovu zamtundu wa AC zomwe zimatentha kwambiri ndipo kutentha kwake kumawola kuposa madigiri 220.

Palinso zinthu zothira thovu zomwe zimakhala ndi kutentha kochepa, monga AD-300, yomwe imakhala ndi kutentha kotsika kwa madigiri 140, ndi zinthu zothira thovu zomwe zimakhala ndi kutentha kwapakati. Chifukwa kusiyana kwa mitengo si kwakukulu, ndipo zinthu zothira thovu zomwe zimakhala ndi kutentha kwakukulu ndizokhazikika, opanga ambiri akale a EVA tsopano akusintha kupita ku zinthu zothira thovu zomwe zimakhala ndi kutentha kwakukulu, ndipo zina zimagwiritsidwanso ntchito pamodzi. Mlingo wa AC umadalira kukula kwake.

Monga cholumikizira, chomwe chimagwiritsidwa ntchito kwambiri masiku ano ndi DCP (di-octyl phthalate). Kale, TAIC, PL400, ndi zina zotero zinkagwiritsidwanso ntchito. Hafu ya moyo wa DCP ndi mphindi imodzi pa madigiri 180 ndi mphindi 10 pa madigiri 130. Chifukwa chake, popangira zida zophunzitsira, kutentha kuyenera kulamulidwa pansi pa madigiri 120.

Pazinthu zina zomwe zimafunikira fungo, BIPB ina ingagwiritsidwe ntchito, yomwe nthawi zambiri imagwiritsidwa ntchito limodzi ndi TAIC. Mlingo wa DCP nthawi zambiri umakhala 0.5-0.6Phr mu thovu lathyathyathya ndi thovu laling'ono lopangidwa mu nkhungu, ndi 0.8-1.0Phr mu thovu lopangidwa ndi jakisoni. Zachidziwikire, palinso zowonjezera ndi zochotsera zoyenera, ndipo zina zimagwiritsidwa ntchito mosiyana.

Ma accelerator a thovu, pali awiri omwe amagwiritsidwa ntchito kwambiri pano, ufa wa zinc oxide ndi ufa wa zinc stearate. Tinkagwiritsa ntchito mitundu iwiriyi pano, koma tsopano tikugwiritsa ntchito zinc oxide yokha. Chinthu chimodzi chingathandizenso, ndipo kukhazikika kwa chinthucho kungakhale bwino. Zinc oxide imatha kuchepetsa kutentha kwa AC kufika madigiri 160, zomwe zimathandiza kupanga. Tili ndi mgwirizano pano kuti mlingo wa zinc oxide nthawi zambiri supitirira 0.2Phr. Ngati chinthucho chili chochuluka kwambiri, kuchepa kwake kudzakhala kwakukulu. Zachidziwikire, ngati chili chochepa kwambiri, liwiro la thovu lidzakhala lochepa kwambiri, kotero ndibwino kuti lisakhale lochepera 1.0hr/.

Mafuta odzola, nthawi zambiri amakhala stearic acid. Ndipotu, sagwira ntchito kwambiri. Amangoletsa kuti zinthuzo zisamamatire ku makina mukamachita masewera olimbitsa thupi. Kugwiritsa ntchito kwambiri sikwabwino chifukwa kungathandize kuchepetsa kukangana pakati pa ziwalo ndikuchepetsa mphamvu zambiri zakuthupi. 0.5Phr ndi yolimbikitsidwa.

2. Zokhudza ukadaulo

Kawirikawiri, pali njira zinayi zopangira thovu la EVA, thovu lalikulu lachikhalidwe, thovu laling'ono lopangidwa mu chikombole, jakisoni ndi thovu lofunika kwambiri.

1Njira yopangira jakisoni

Njirayi idzakhala yodziwika bwino mtsogolomu. Chogulitsachi chimapangidwa m'njira imodzi, koma kulondola kwa nkhungu ndikokwera. Mfundoyi ndi yofanana ndi kuumba jakisoni m'makampani opanga pulasitiki, kupatula kuti nkhungu yopangira jakisoni imatsegulidwa nthawi yomweyo, ndipo kutentha kwa nkhungu kumakhala kosiyana. Izi zikutanthauza kuti, kubayidwa kwa EVA kumangosintha kutentha kwa nkhungu ndi nthawi yotsegulira nkhungu ya kuumba jakisoni wa pulasitiki. Masiku ano, nsapato zambiri zamasewera zodziwika bwino zimapangidwa pogwiritsa ntchito njira iyi. Poyerekeza ndi njira zina, magwiridwe antchito ali kutali kwambiri.

2 Thovu lalikulu lachikhalidwe lathyathyathya

Masiku ano, mafakitale ang'onoang'ono nthawi zambiri amagwiritsa ntchito njira imeneyi, ndipo mtengo wa makina ndi zida ndi wotsika. Njirayi imapanga mbale, zomwe zimapangidwa kukhala zinthu kudzera munjira monga kuboola ndi kupukuta m'mphepete. Mikhalidwe ya thovu imakhala yokhazikika, kutentha ndi 160-170, nthawi imatsimikiziridwa ndi makulidwe a nkhungu, nthawi zambiri masekondi 90-110/MM, ndipo kuthamanga ndi 150KG/sikweya CM.

3 Thovu laling'ono mu chikombole

Njirayi imagwiritsidwa ntchito makamaka popanga nsapato. Nsapato zamasewera zimagwiritsidwa ntchito popanga thovu loyamba la midsole yachiwiri. Nsapato zomwe zakonzedwa motsatira njira iyi zimadulidwa, kuyezedwa ndikuyikidwa mu nkhungu yotseguka. Nsapato ikatha kupangidwa thovu, idzawoneka ngati mawonekedwe onse.

Vuto la njirayi ndi kusinthasintha kwa nkhungu ndi njira yopangira, apo ayi zidzakhala zovuta kulamulira kukula ndi kuuma nthawi imodzi. Nthawi zambiri kukula kumakhala koyenerera koma kuuma sikukwanira, ndipo kuuma kumakhala kokwanira ndipo kukula kwake ndi kochepa kwambiri.

Mikhalidwe ya thovu la njirayi imasinthasintha pang'ono, kutengera mawonekedwe ndi kapangidwe ka chinthucho. Zachidziwikire, kusintha kwakukulu ndi nthawi ndi kutentha.

Ndatchula kale za midsole yachiwiri, ndipo apa ndikuwonetsani mawonekedwe achiwiri. Pukutani khungu la embryo yopyapyala yomwe inali ndi thovu kale, ikanikeni mu mawonekedwe omalizidwa, ndikupanga chinthucho kudzera mu magawo awiri otenthetsera ndi kuziziritsa.

Kutentha kwa kutentha ndi 125-135, ndipo kuthamanga ndi 50KG/cm2. Pambuyo potenthetsa kwa nthawi inayake, kenako imaziziritsidwa ndi madzi, ndipo imachotsedwa ngati midsole yachiwiri. Kukula kwa pansi kwa mtundu uwu wa kupanikizika kumakhala kokhazikika, ndipo mawonekedwe ake ndi abwinoko.

4 Kutulutsa thovu loopsa kwambiri

Unyolo wa mamolekyu wa EVA ndi wolunjika, kotero cholumikizira cholumikizira nthawi zambiri chimawonjezedwa panthawi yotulutsa thovu kuti chitseke mpweya kudzera mu kapangidwe kolumikizana. Chifukwa chake, kutulutsa thovu koopsa kwa EVA kuyenera kuthetsa vuto la momwe mungatsekere mpweya.

Poganizira zikalata za patent ndi zina mwazidziwitso za kampani, njira yopangira thovu ya EVA ndi njira yomweyo: kulumikiza ndi kuyika granulation pambuyo posakaniza ndi kusakaniza mkati, kuumba kuti mupeze nsapato yopangidwa kale, ndikuyika sole mu autoclave kuti ipange thovu. Mu chipangizochi, chopangira thovu chenicheni chimalowetsedwa mu ketulo, ndipo thovu lopangidwa ndi thovu lokhala ndi ma microporous limapezeka pogwiritsa ntchito njira yochepetsera kupanikizika.

Kusintha kwa mawonekedwe a zinthu za EVA: granulation-injection/injection molding-thom-sole.

Njira yopangira thovu iyi ingathe kumveka mosavuta ngati kusintha mankhwala opangira thovu kukhala mankhwala enieni panthawi yopangira thovu, ndikuwonjezera ntchito yochepetsera kupanikizika mwachangu kuti mupeze chidebe cha thovu cha EVA cholimba kwambiri. Ngati mukufuna kuti njira yonseyi ikhale yosamalira chilengedwe komanso yoyera, njira yakale yolumikizirana ikhoza kusinthidwa ndi radiation cross-linking ndi njira zina.

Njira yopangira thovu lofunika kwambiri yakula kwambiri m'zaka ziwiri zapitazi, ndipo zida ndi njira zake zasintha pang'onopang'ono. Pakati pawo, kuwongolera njira ndi njira kuti zigwire bwino ntchito komanso kuchepetsa ndalama ndi kuwongolera ndiye chinsinsi.