Mphamvu ya VA zomwe zili mu EVA hot-melt zomatira pakuchita ndi kugwiritsa ntchito

EVA (yomwe imadziwikanso kuti E/VAC kapena E/VAC), dzina la sayansi: ethylene-vinyl acetate copolymer (yomwe imadziwikanso kuti ethylene-vinyl acetate copolymer) imapezeka mwa copolymerizing ethylene (E) ndi vinyl acetate (VA).

Zomatira zotentha zosungunuka ndi EVAutomoni monga chigawo chachikulu, chifukwa mulibe zosungunulira, saipitsa chilengedwe ndipo ali ndi chitetezo mkulu, ndi abwino kwambiri kupanga basi msonkhano mzere kupanga, choncho chimagwiritsidwa ntchito mu: kumanga mabuku, mipando m'mphepete banding, galimoto ndi banja Assembly. wa zida zamagetsi, kupanga nsapato, zokutira pamphasa ndi zitsulo zoletsa dzimbiri, inki, katundu, mapadi a mabotolo, ndi zina zotero, kotero kuti msika wapachaka wa dziko langa ukuwonjezeka mosalekeza.

Ndiye mungapangire bwanji zomatira za EVA zotentha zosungunuka zoyenera mayendedwe onse amoyo? Chofunikira choyamba ndikuyang'ana zomwe zili mu VA.

Zambiri za vinyl acetate VA zili pafupifupi 5% -40%. EVA imakhala ndi kusinthasintha komanso kusinthasintha, kukana kutsika kwa kutentha kwapansi, ndipo kungagwiritsidwe ntchito pozizira komanso kutentha pang'ono kutsika madigiri 20-40; ntchito yabwino yosindikiza kutentha komanso malo osungunuka otsika.

Kuchuluka kwa EVA kumatsimikiziridwa ndi kuchuluka kwa zomwe zili mu VA. Zomwe zili pamwamba pa VA, pafupi ndi utomoni ndi rabala, kotero kuuma kwake kudzakhala kochepa kusiyana ndi mankhwala omwewo. Kuphatikiza apo, kusiyana kwa zomwe zili mu VA kumatsimikiziranso zomwe ziyenera kuchita. Ngati zomwe VA zili pansipa 5%, zitha kugwiritsidwa ntchito ngati chingwe. Chifukwa chake, nthawi zambiri, zinthu za VA zikafika pa 10% ~ 20%, zimakhala zapulasitiki, ndipo VA ikapitilira 30%, imakhala yotanuka.