Kodi Mafilimu a PP ndi chiyani?

KATUNDU

Polypropylene kapena PP ndi thermoplastic yotsika mtengo komanso yomveka bwino, yonyezimira kwambiri komanso yolimba bwino. Ili ndi malo osungunuka kwambiri kuposa PE, zomwe zimapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito zomwe zimafuna kuyeretsa kutentha kwambiri. Ilinso ndi chifunga chochepa komanso chonyezimira kwambiri. Nthawi zambiri, mphamvu zotsekera kutentha za PP si zabwino ngati za LDPE. LDPE ilinso ndi mphamvu yabwino yong'ambika komanso yolimba kwambiri kutentha.

PP ikhoza kusinthidwa kukhala chitsulo chomwe chimapangitsa kuti zinthu zikhale bwino kwambiri poteteza mpweya kuti zigwiritsidwe ntchito molimbika pomwe nthawi yayitali yosungiramo zinthu ndi yofunika.Mafilimu a PPndi oyenera kugwiritsidwa ntchito m'mafakitale osiyanasiyana, ogula, komanso magalimoto.

PP imatha kubwezeretsedwanso kwathunthu ndipo imatha kusinthidwa mosavuta kukhala zinthu zina zambiri kuti igwiritsidwe ntchito m'njira zosiyanasiyana. Komabe, mosiyana ndi mapepala ndi zinthu zina za cellulose, PP siingawonongeke. Koma ubwino wake ndi wakuti zinyalala za PP sizipanga zinthu zina zoopsa kapena zoopsa.

Mitundu iwiri yofunika kwambiri ndi polypropylene yopangidwa ndi cast unoriented (CPP) ndi polypropylene yozungulira (BOPP). Mitundu yonseyi ili ndi kuwala kwambiri, kuwala kwapadera, kutentha kotseka bwino, kukana kutentha bwino kuposa PE, komanso mphamvu zabwino zotchingira chinyezi.

Mafilimu a Polypropylene Opangidwa ndi Anthu (CPP)

Polypropylene yopangidwa ndi Cast unoriented (CPP) nthawi zambiri imakhala ndi ntchito zochepa kuposa polypropylene yopangidwa ndi biaxially (BOPP). Komabe, CPP yakhala ikupita patsogolo pang'onopang'ono ngati chisankho chabwino kwambiri m'maphukusi ambiri osinthika komanso osapangidwa ndi maphukusi. Kapangidwe ka filimuyi kakhoza kusinthidwa kuti kakwaniritse zofunikira zinazake zomangirira, magwiridwe antchito, ndi kukonza. Kawirikawiri, CPP ili ndi kukana kwambiri kung'ambika ndi kukhudza, kutentha kozizira bwino komanso mphamvu zotseka kutentha kuposa BOPP.

Mafilimu a Polypropylene Ozungulira Biaxial (BOPP)

Polypropylene kapena BOPP1 yozungulira biaxially ndiyo filimu yofunika kwambiri ya polypropylene. Ndi njira yabwino kwambiri yogwiritsira ntchito cellophane, pepala lopaka sera, ndi zojambulazo za aluminiyamu. Kuwongolera kumawonjezera mphamvu yokoka ndi kuuma, kumachepetsa kutalika (kovuta kutambasula), ndikukweza mawonekedwe a kuwala, ndikukweza pang'ono mawonekedwe a nthunzi. Kawirikawiri, BOPP ili ndi mphamvu yokoka kwambiri, kuuma kwakukulu, kutsika pang'ono, chotchinga mpweya chabwino, komanso chifunga chochepa kuposa CPP.

NTCHITO

Filimu ya PP imagwiritsidwa ntchito pazinthu zambiri zodziwika bwino monga ndudu, maswiti, zokhwasula-khwasula ndi zophimba chakudya. Ingagwiritsidwenso ntchito pophimba shrink wrap, matepi, matewera ndi zophimba zoyera zomwe zimagwiritsidwa ntchito pazachipatala. Popeza PP ili ndi mphamvu zoteteza mpweya, nthawi zambiri imakutidwa ndi ma polima ena monga PVDC kapena acrylic zomwe zimakulitsa kwambiri mphamvu zake zoteteza mpweya.

Chifukwa cha fungo lochepa, kukana mankhwala ambiri komanso kusagwira bwino ntchito, mitundu yambiri ya PP ndiyoyenera kugwiritsidwa ntchito popaka zinthu motsatira malamulo a FDA.