PP kapena PE Chomwe ndi Chakudya-kalasi
PP ndi PE onse ndi zida za chakudya.
PP imakhala ndi malo osungunuka kwambiri ndipo ingagwiritsidwe ntchito popanga mabotolo a mkaka wa soya, mabotolo a madzi, mabokosi a chakudya cha microwave, ndi zina zotero. , magalimoto, njinga, mbali, mapaipi onyamula katundu, zotengera mankhwala, komanso ma CD chakudya ndi mankhwala.
Chigawo chachikulu cha PE ndi polyethylene, yomwe imadziwika kuti ndiyo yabwino kwambiri pazakudya padziko lonse lapansi. Ndiwopanda poyizoni, wosakoma, wosanunkhiza, ndipo umakhala ndi phula, womwe umakwaniritsa miyezo yaukhondo pakuyika chakudya.
Chigawo chachikulu cha PP ndi polypropylene . Polypropylene ili ndi kachulukidwe kochepa kwambiri pakati pa mapulasitiki onse, pafupifupi 0.90.
Kuchokera pakuwona kukana kutentha, polypropylene imakhala ndi kutentha kwambiri kuposa polyethylene. Nthawi zambiri, kutentha kwa polypropylene kumakhala pafupifupi 40% -50% kuposa polyethylene, pafupifupi 160-170 ° C. Chifukwa chake, zinthu zopangidwa ndi PP zimatha kutsukidwa kutentha pamwamba pa 100 ° C ndikukhalabe osasinthika pa 150 ° C popanda kupunduka popanda mphamvu yakunja.
Kufotokozera kwa Pulasitiki wa Zakudya
Pali mitundu yosiyanasiyana yamapaketi apulasitiki okhudzana ndi chakudya, kuphatikiza polyethylene (PE)polypropylene (PP), polyvinyl kolorayidi (PVCpolystyrene (PS), polyester (PET), polycarbonate (PC), etc.
Mwa iwo, PP ndi PS amagwiritsidwa ntchito makamaka podula pulasitiki. PP ndiyokhazikika, pomwe PS imatha kuvulaza thupi la munthu chifukwa cha kupezeka kwa ma monomers owopsa kapena zinthu zosakhazikika.
Mitundu yosiyanasiyana ya zodulira pulasitiki zotayidwa zimakhala ndi mawonekedwe osiyanasiyana ogwiritsira ntchito ndipo zimawonetsa kusiyana kwakukulu kwa kutentha ndi kukana kukakamizidwa. Kutentha kogwiritsa ntchito zodulira pulasitiki zotayidwa nthawi zambiri kumakhala pansi pa 100 ℃, ndipo kutentha kwapamwamba sikuyenera kupitirira 150 ℃.
