Nkhani

Pakati pa mapulasitiki aukadaulo, chinthu chimodzi chimaonekera chifukwa cha kukana kwake kuwonongeka, kukana kugunda, komanso kudzipaka mafuta okha, zomwe zimapangitsa kuti chikhale chimodzi mwa njira zabwino kwambiri zogwirira ntchito zovuta. Polyethylene yolemera kwambiri (Ultra-high molecular weight polyethylene)UHMWPE) yasinthidwa kukhala pepala, ikukulitsa kuchuluka kwa momwe imagwiritsidwira ntchito mpaka kufika pamlingo wosayerekezeka, ikuchita gawo losasinthika pa chilichonse kuyambira machitidwe otumizira katundu m'makampani akuluakulu mpaka mizere yopangira chakudya.

I. Kumvetsetsa UHMWPE: Kodi "Kulemera Kwambiri kwa Mamolekyulu" n'chiyani?

UHMWPE si polyethylene wamba. Pakati pake pali "kulemera kwake kwakukulu kwa mamolekyulu"—maunyolo ake a mamolekyulu ndi otalika nthawi zoposa 10 kuposa a polyethylene wamba wolemera kwambiri (HDPE), nthawi zambiri zimapitirira 1.5 miliyoni. Maunyolo a mamolekyu amenewa amamangiriridwa, kupanga kapangidwe ka mamolekyu kolimba kwambiri komwe kumapatsa chinthucho mawonekedwe ake odabwitsa.

Pepala la UHMWPE limapangidwa kuchokera ku zinthu zapaderazi kudzera mu njira zoyeretsera, kukanikiza, kapena kutulutsa. Kukhuthala kwake kumasiyana kuyambira mamilimita angapo mpaka mazana a mamilimita, kukwaniritsa zosowa zosiyanasiyana.

II. Makhalidwe Asanu Odziwika aPepala la UHMWPE

1. Kukana Kuvala Kwambiri: Ichi ndi khalidwe lodziwika bwino la UHMWPE. Kukana kwake kuvala n'kokwera kwambiri kuposa zitsulo zambiri (monga chitsulo cha carbon ndi chitsulo chosapanga dzimbiri), kuwirikiza kanayi kapena kasanu kuposa nayiloni (PA), ndi kuwirikiza katatu kuposa polyoxymethylene (POM). M'malo ovalira, ndi "Mfumu ya Mapulasitiki."

2. Kukana Kwambiri Kukhudza: Ngakhale kutentha kotsika (-40°C kapena kutsika), mphamvu yake yokhudza imakhalabe yokwera kwambiri, yomwe imayamwa bwino kugwedezeka ndi kugwedezeka popanda kusweka kapena kusweka mosavuta.

3. Kudzipaka Mafuta Bwino Kwambiri ndi Kusamamatira: Kuchuluka kwake kwa kukangana ndi kochepa kwambiri, kofanana ndi madzi, ndipo kumasonyeza makhalidwe osamamatira. Izi zimachepetsa kukana pamene zinthu zimatsetsereka pamwamba pake, kuteteza kumatira komanso kuchepetsa kwambiri kuwonongeka kwa zipangizo ndi zipangizo.

4. Kukana Mankhwala: Imakhala ndi kukana dzimbiri kwabwino kwambiri ku njira zambiri za asidi, alkali, ndi mchere, zomwe zimapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito m'malo owononga monga kukonza mankhwala.

6. Ukhondo komanso wopanda poizoni: Umagwirizana ndi satifiketi ya US FDA ndi USDA, umatha kulumikizana mwachindunji ndi chakudya ndi mankhwala, ndipo umagwiritsidwa ntchito kwambiri m'mafakitale opangira chakudya ndi zamankhwala. Nthawi yomweyo, umayamwa madzi ochepa kwambiri ndipo si wosavuta kubereketsa mabakiteriya.

IV. Chifukwa ChosankhaPepala la UHMWPE? — Kuyerekeza ndi Chitsulo ndi Mapulasitiki Ena a Uinjiniya

1. Poyerekeza ndi Chitsulo (monga, Chitsulo cha Kaboni, Chitsulo Chosapanga Dzimbiri):

Yosagwiritsidwa Ntchito Kwambiri: Nthawi yake yogwira ntchito imaposa nthawi ya chitsulo pamene ikugwiritsidwa ntchito movutikira.
Yopepuka: Kuchuluka kwake ndi 0.93-0.94 g/cm³ yokha, 1/7 kuposa chitsulo, zomwe zimapangitsa kuti zikhale zosavuta kuyika ndi kunyamula.

Chopanda phokoso: Chimagwira ntchito mwakachetechete, kuchotsa phokoso lamphamvu la kukangana kwa zitsulo.

Sizimalimbana ndi dzimbiri: Sizimalimbana ndi dzimbiri komanso mankhwala.

2. Poyerekeza ndi Mapulasitiki Ena a Uinjiniya (monga, Nayiloni, Polyoxymethylene):

Yosatha Kutha: Kutha kwatha kwake kumakhala kokulirapo kangapo.

Kukangana Kotsika: Kapangidwe kake kodzipaka mafuta ndi kabwino kwambiri.

Yosakhudzidwa Kwambiri ndi Mphamvu: Ubwino wake umaonekera kwambiri kutentha kochepa.

Pepala la UHMWPEndi chimphona champhamvu pang'ono m'mafakitale amakono. Ngakhale sichili cholimba ngati chitsulo, kukana kwake kuvala kosayerekezeka komanso magwiridwe antchito ake onse kumapangitsa kuti ikhale yothandiza kwambiri polimbana ndi kuvala, kuchepetsa kugwiritsa ntchito mphamvu, komanso kukonza magwiridwe antchito. Kuyambira migodi mpaka kukhitchini, kuyambira mafakitale mpaka mabwalo amasewera, kulimba kwa pepala la "pulasitiki" ili kumateteza magwiridwe antchito a zida zambiri kwa nthawi yayitali, ndikupangitsa kuti ikhale "woteteza kuvala" komanso "woteteza mayendedwe" weniweni m'mafakitale.