Hauv cov zej zog niaj hnub no, kev siv cov thawv yas rau kev khaws khoom noj yog dav. "Food-qib" yog hais txog cov ntaub ntawv uas muaj kev nyab xeeb rau kev sib cuag zaub mov, thiab kev nkag siab txog cov yas twg raws li tus qauv no yog qhov tseem ceeb rau cov tuam txhab thiab cov neeg siv khoom. Ntawm ntau yam yas, PET (polyethylene terephthalate) tau lees paub dav rau nws txoj kev nyab xeeb thiab siv dav hauv ntim khoom noj. Kab lus no yuav tshawb txog cov yam ntxwv ntawm cov zaub mov- qib plastics, tsom rau cov zaub mov- qib PET lub thawv ntim khoom, thiab piav qhia vim li cas lawv thiaj suav tias yog qhov kev xaiv cia khoom noj muaj kev nyab xeeb thiab txhim khu kev qha.
Kawm txog zaub mov- qib plastics
Khoom noj khoom haus- qib plastics yog cov khoom uas tau sim los ntawm cov koom haum tswj hwm xws li US Food and Drug Administration (FDA) thiab European Food Safety Authority (EFSA) thiab tau pom tias muaj kev nyab xeeb rau kev sib cuag zaub mov. Cov yas no yuav tsum tsis txhob muaj cov tshuaj phem uas tuaj yeem nkag mus rau hauv cov zaub mov thiab ua rau muaj kev phom sij rau kev noj qab haus huv. Cov qauv rau zaub mov- qib plastics suav nrog tsis yog- tshuaj lom, tsis kam mus rau tshuaj lom neeg corrosion, thiab muaj peev xwm nyob ruaj khov thiab tsis yog-degradable ntawm ntau qhov kub thiab txias.
Ntawm ntau yam yas, PET yog ib qho ntawm cov khoom siv feem ntau siv rau ntim khoom noj. Nws cov koob meej stems los ntawm nws cov khoom thaiv zoo heev, uas pab tswj cov khoom noj tshiab thiab zoo. PET kuj muaj qhov zoo xws li ua lub teeb yuag, tawg - tiv taus, thiab rov ua dua tshiab, ua rau nws xaiv ib puag ncig zoo. PET ntim thawv tshwj xeeb yog nyiam rau lawv cov pob tshab, ua kom yooj yim rau cov neeg siv khoom pom cov ntsiab lus.
Cov yam ntxwv ntawm PET ua zaub mov - cov khoom qib
PET yog polyester polymerized los ntawm ethylene glycol thiab terephthalic acid. Nws cov qauv molecular endows nws nrog siab crystallinity, yog li txhim kho nws lub zog thiab kav ntev. Ib qho ntawm cov yam ntxwv tseem ceeb ntawm PET yog nws cov inertness, uas txhais tau tias nws yuav tsis hnov mob nrog cov khoom xyaw. Cov yam ntxwv no yog qhov tseem ceeb rau kev tswj xyuas kev ncaj ncees thiab kev nyab xeeb ntawm zaub mov.
Tsis tas li ntawd, PET tiv taus cov kua qaub thiab roj, uas feem ntau pom hauv cov zaub mov. Qhov kev tiv thaiv corrosion no ua kom lub ntim yuav tsis lwj lossis cuam tshuam rau qhov zoo ntawm cov khoom noj. Tsis tas li ntawd, PET tuaj yeem tiv taus ntau qhov kub thiab txias, los ntawm khov mus rau boiling, tsis poob nws cov qauv kev ncaj ncees. Qhov no ua rau nws tsim nyog rau ntau yam khoom siv khaws cia, los ntawm cov khoom noj tub yees mus rau cov dej kub.
Kev siv cov zaub mov - qib PET thawv
Khoom noj khoom haus- qib PET lub thawv muaj ntau yam kev siv, los ntawm kev cia khoom noj hauv tsev mus rau kev ntim khoom noj. Hauv tsev, cov thawv no zoo tagnrho rau khaws cov khoom seem, npaj zaub mov, thiab npaj cov khoom noj khoom haus. Nws cov pob tshab thiab lub teeb yuag ua rau nws yooj yim siv hauv lub neej txhua hnub.
Hauv kev lag luam, cov thawv PET tau dav siv los ntim cov khoom tshiab, cov khoom ci, thiab npaj tau-- noj zaub mov. Khoom noj khoom haus- qib PET lub thawv yog tshwj xeeb tshaj yog nrov hauv kev lag luam tsim khoom tshiab vim tias lawv thaiv cov dej noo thiab oxygen, yog li ncua lub txee lub neej ntawm cov txiv hmab txiv ntoo thiab zaub. Qhov no tsis tsuas yog pab tswj cov khoom tshiab tab sis kuj txo cov khoom noj khoom haus.
Kev cuam tshuam ib puag ncig thiab rov ua dua ntawm PET
Ib qho txiaj ntsig tseem ceeb ntawm PET yog nws cov khoom siv rov ua dua tshiab. PET tuaj yeem rov ua dua ntau zaus yam tsis tau poob nws cov khoom yooj yim, ua rau nws muaj kev xaiv ruaj khov rau ntim khoom noj. Cov txheej txheem rov ua dua tshiab suav nrog kev ntxuav thiab rov ua cov ntaub ntawv los tsim cov khoom tshiab, yog li txo qhov kev thov rau cov yas yas thiab txo qhov cuam tshuam ib puag ncig.
Recycling PET tsis tsuas yog txuag cov peev txheej xwb tab sis kuj txo cov pa hluav taws xob hauv tsev cog khoom cuam tshuam nrog kev tsim cov yas. Ntau lub tuam txhab tam sim no siv kaw- lub voj voog rov ua dua los khaws cov thawv PET, rov ua dua tshiab, thiab rov siv dua hauv kev tsim cov ntim tshiab. Txoj hauv kev no ua raws li cov hauv paus ntsiab lus ntawm kev lag luam ncig, pab txhawb kev txhim kho kom ruaj khov thiab txo cov khoom pov tseg.
Cov kev sib tw thiab kev txiav txim siab siv PET hauv ntim khoom noj
Txawm hais tias muaj ntau qhov zoo ntawm PET, nws siv hauv ntim khoom noj kuj tseem ntsib qee qhov teeb meem. Ib qho teeb meem tseem ceeb yog qhov muaj peev xwm ntawm cov tshuaj lom neeg, tshwj xeeb tshaj yog thaum PET raug kub siab. Txawm hais tias PET feem ntau suav hais tias muaj kev nyab xeeb, cov txheej txheem ntsuas kub tau pom zoo yuav tsum tau ua nruj me ntsis txhawm rau tiv thaiv kev pheej hmoo ntawm kev kis kab mob.
Lwm qhov yuav tsum tau xav txog yog qhov cuam tshuam ib puag ncig ntawm PET ntau lawm. Txawm hais tias PET tuaj yeem rov ua dua tshiab, nws cov txheej txheem tsim khoom yog lub zog - siv zog thiab tso siab rau cov khoom siv tsis yog - tauj dua tshiab. Txhawm rau txo cov kev cuam tshuam no, cov tuam txhab lag luam tab tom tshawb nrhiav kev siv PET rov ua dua tshiab (rPET) thiab bio-raws li PET, cov ntaub ntawv tau los ntawm cov peev txheej txuas ntxiv nrog cov pa roj carbon tsawg dua.
Xaus
Hauv cov ntsiab lus, PET yog cov khoom noj muaj ntau yam thiab txhim khu kev qha - cov khoom ntim qib. Nws txoj kev nyab xeeb, durability, thiab recyclability ua rau nws zoo tagnrho rau cov neeg siv khoom thiab cov chaw tsim khoom. Nrog rau qhov kev xav tau loj zuj zus ntxiv rau cov kev daws teeb meem ntim khoom ruaj khov, kev txhim kho cov khoom siv PET tshiab, xws li cov khoom noj khoom haus - qib PET lub thawv, yuav ua lub luag haujlwm tseem ceeb hauv kev ua kom tau raws li cov kev xav tau ntawm kev lag luam khoom noj thiab txo qhov cuam tshuam ib puag ncig. Los ntawm kev nkag siab txog cov khoom thiab kev siv ntawm cov zaub mov- qib plastics, peb tuaj yeem txiav txim siab paub qhov sib npaug ntawm kev nyab xeeb thiab kev ruaj ntseg.
