Ho Atoloha ha Li-valve tsa Plastiki

Le hoja ka linako tse ling li-valve tsa polasetiki li nkoa e le sehlahisoa se ikhethang—khetho e holimo ea ba etsang kapa ba ralang lihlahisoa tsa liphaephe tsa polasetiki bakeng sa litsamaiso tsa indasteri kapa ba tlamehang ho ba le lisebelisoa tse hloekileng haholo—haeba li-valve tsena li se na tšebeliso e mengata ka kakaretso ke pono e khuts'oane. Ha e le hantle, li-valve tsa polasetiki kajeno li na le mefuta e mengata ea ts'ebeliso kaha mefuta e ntseng e hola ea thepa le baqapi ba hloahloa ba hlokang thepa eo ba bolela litsela tse ngata tsa ho sebelisa lisebelisoa tsena tse feto-fetohang.

MATLALO A PLASTIKI
Melemo ea li-valve tsa polasetiki ke e pharaletseng—ho hanyetsa mafome, ho hanyetsa lik'hemik'hale le ho khohlela; mabota a boreleli ka hare; boima bo bobebe; bonolo ba ho kenya; tebello ea bophelo bo bolelele; le litšenyehelo tse tlase tsa potoloho ea bophelo. Melemo ena e lebisitse ho amoheloeng ka bongata ha li-valve tsa polasetiki lits'ebetsong tsa khoebo le tsa indasteri tse kang kabo ea metsi, kalafo ea metsi a litšila, ts'ebetso ea tšepe le lik'hemik'hale, lijo le meriana, lifeme tsa motlakase, libaka tsa ho hloekisa oli le tse ling.
Li-valve tsa polasetiki li ka etsoa ka thepa e fapaneng e sebelisoang ka mekhoa e mengata. Li-valve tsa polasetiki tse tloaelehileng haholo li entsoe ka polyvinyl chloride (PVC), chlorine polyvinyl chloride (CPVC), polypropylene (PP), le polyvinylidene fluoride (PVDF). Li-valve tsa PVC le CPVC hangata li hokahanngoa le litsamaiso tsa liphaephe ka lipheletso tsa sokete tse qhibilihisang samente, kapa lipheletso tse nang le khoele le tse flangelitsoeng; athe, PP le PVDF li hloka ho kopanngoa ha likarolo tsa sistimi ea liphaephe, ebang ke ka mahlale a mocheso, a butt kapa a electro-fusion.

Leha polypropylene e na le halofo ea matla a PVC le CPVC, e na le khanyetso ea lik'hemik'hale e feto-fetohang ka ho fetisisa hobane ha ho na li-solvents tse tsejoang. PP e sebetsa hantle ho li-acetic acid tse matla le li-hydroxide, 'me e boetse e loketse litharollo tse bonolo tsa boholo ba li-acid, li-alkali, letsoai le lik'hemik'hale tse ngata tsa tlhaho.

PP e fumaneha e le thepa e nang le mmala kapa e se nang mmala (wa tlhaho). PP ya tlhaho e senyeha haholo ke mahlaseli a ultraviolet (UV), empa metsoako e nang le mmala o motsho wa carbon o fetang 2.5% e tsitsitse UV ka ho lekaneng.

Mekhoa ea liphaephe tsa PVDF e sebelisoa lits'ebetsong tse fapaneng tsa indasteri ho tloha meriana ho ea merafong ka lebaka la matla a PVDF, mocheso oa ho sebetsa le k'hemik'hale e hanyetsang letsoai, li-acid tse matla, metheo e hlapollang le li-solvents tse ngata tsa tlhaho. Ho fapana le PP, PVDF ha e senyehe ke khanya ea letsatsi; leha ho le joalo, polasetiki e bonaletsa khanya ea letsatsi 'me e ka pepesetsa mokelikeli mahlaseling a UV. Le hoja mokhoa oa tlhaho oa PVDF o se nang 'mala o motle bakeng sa ts'ebeliso ea ka tlung e hloekileng haholo, e eketsang 'mala o mofubelu o kang oa lijo o tla lumella ho pepesehela khanya ea letsatsi ntle le phello e mpe mokelikeling oa metsi.