Muab cov naj npawb ntawm cov kev xaiv muaj, xaiv lub hnab yas zoo tuaj yeem ua haujlwm nyuaj me ntsis.Qhov no yog vim lub hnab yas yog tsim los ntawm cov ntaub ntawv sib txawv thiab txhua yam ntawm cov ntaub ntawv no muaj cov neeg siv cov yam ntxwv tshwj xeeb.Lawv kuj tuaj hauv ntau hom sib xyaw thiab xim.
Muaj ntau ntau lub hnab yas tawm muaj, txawm li cas los xij, los ntawm kev paub koj tus kheej nrog txhua hom, koj tuaj yeem nqaim koj cov kev xaiv ntau heev thiab xaiv lub hnab zoo rau koj cov kev xav tau.Yog li, cia peb dhia dej thiab ua tib zoo saib ntau hom hnab yas muaj nyob hauv khw niaj hnub no:
High Density Polyethylene (HDPE)
Ib qho ntawm cov yas siv thoob plaws ntiaj teb, HDPE nta ntau yam zoo, uas ua rau nws yog ib qho khoom siv zoo heev rau kev tsim cov hnab yas.Nws yog lub teeb yuag, kuj pob tshab, dej thiab kub resistant, thiab muaj zog tensile siab.
Tsis tas li ntawd, HDPE hnab yas ua tau raws li USDA thiab FDA cov lus qhia tuav cov zaub mov, yog li ua rau lawv muaj kev xaiv nrov rau ob qho tib si khaws cia thiab muab zaub mov hauv kev tawm mus thiab muag khoom.
HDPE hnab yas tuaj yeem pom hauv khw noj mov, khw muag khoom yooj yim, khw muag khoom noj, delis thiab txawm nyob hauv tsev rau khaws cia thiab ntim khoom.HDPE kuj tseem siv rau cov hnab khib nyiab, hnab ntim khoom siv, hnab T-shirt, thiab hnab ntxhua khaub ncaws, thiab lwm yam.
Tsawg Density Polyethylene (LDPE)
Hom yas no feem ntau yog siv rau cov hnab ntim khoom noj, hnab ntim khoom noj, hnab cij nrog rau cov hnab uas muaj zog me ntsis thiab ncab zog.Txawm hais tias LDPE tsis muaj zog npaum li HDPE hnab, lawv muaj peev xwm khaws cov khoom loj, tshwj xeeb yog cov khoom noj thiab cov khoom noj nqaij.
Tsis tas li ntawd, cov yas ntshiab ua rau nws yooj yim los txheeb xyuas cov ntsiab lus, tso cai rau cov chaw noj mov kom ceev ceev ntawm cov chav ua noj ua lag luam.
Uas tau hais tias, LDPE hnab yas yog cov khoom siv ntau yam thiab yog nrov rau kev siv nrog kub-sealing vim lawv cov ntsiab lus melting tsawg.LDPE kuj ua tau raws li USDA thiab FDA cov lus qhia tuav zaub mov thiab kuj tseem qee zaum siv los ua npuas qhwv.
Linear Low Density Polyethylene (LLDPE)
Qhov sib txawv tseem ceeb ntawm LDPE thiab LLDPE hnab yas yog tias tom kawg muaj qhov ntsuas me ntsis nyias.Txawm li cas los xij, qhov zoo tshaj plaws ntawm cov yas no yog tsis muaj qhov sib txawv ntawm lub zog, uas tso cai rau cov neeg siv txuag nyiaj yam tsis muaj kev cuam tshuam rau qhov zoo.
Lub hnab LLDPE nthuav tawm qhov nruab nrab ntawm qhov pom tseeb thiab siv rau kev tsim cov hnab ntim khoom noj, hnab ntawv xov xwm, hnab khw nrog rau cov hnab khib nyiab.Lawv kuj tuaj yeem siv rau kev khaws cov zaub mov hauv lub tub yees thiab tub yees, vim tias lawv tau siv los khaws cov khoom noj khoom haus ntau hauv chav ua noj.
Medium Density Polyethylene (MDPE)
MDPE yog qhov sib piv pom tseeb dua HDPE, tab sis tsis meej npaum li cov polyethylene tsawg.Cov hnab ntim khoom ua los ntawm MDPE tsis cuam tshuam nrog lub zog siab, thiab tsis ua rau lawv ncab zoo, yog li tsis nyiam rau kev nqa lossis khaws cov khoom lag luam ntau.
Txawm li cas los xij, MDPE yog ib yam khoom siv rau lub hnab khib nyiab thiab feem ntau yog siv rau hauv cov neeg siv khoom ntim rau cov khoom siv ntawv xws li ntawv toiler lossis ntawv phuam.
Polypropylene (PP)
PP hnab yog tus cwj pwm los ntawm lawv cov tshuaj muaj zog thiab ua haujlwm zoo.Tsis zoo li lwm lub hnab, hnab polypropylene tsis ua pa thiab yog qhov zoo tagnrho rau cov khw muag khoom vim lawv lub neej txee ntev dua.PP kuj tseem siv rau ntim khoom noj, qhov twg cov khoom xws li khoom qab zib, txiv ntseej, tshuaj ntsuab thiab lwm yam khoom qab zib tuaj yeem khaws cia hauv lub hnab tau yooj yim los ntawm nws.
Cov hnab no muaj qhov sib piv meej dua li lwm tus, tso cai rau cov neeg siv txhim kho pom kev.PP hnab kuj zoo heev rau cov cua sov sealing vim lawv qhov siab melting point, thiab, zoo li lwm cov hnab yas xaiv, yog USDA thiab FDA pom zoo rau kev tuav zaub mov.