PET ndi chiyani?

pulasitiki wokonzanso

M'dziko lamapulasitiki pali mitundu yosiyanasiyana yazinthu zopangira. Mmodzi wa iwo ndi PET (Poly Ethylene Terephthalate). Ili m'gulu la ma polyesters ndipo ndi mtundu wa zopangira pulasitiki zopangidwa kuchokera ku mafuta. Anthu ambiri sakudziwa PET ndi chiyani?. Anazipeza ndi asayansi aku Britain a Whinfield ndi Dickson, mu 1941, omwe adavotera ngati polima wopangira ulusi. Imathandiza kwambiri masiku ano.

Chifukwa chake, tipereka nkhaniyi kukuuzani kuti PET ndi chiyani, mawonekedwe ake ndi chiyani?

PET ndi chiyani?

mabotolo apulasitiki

Nkhaniyi ili ndi mawonekedwe otsatirawa, omwe apangitsa kuti ikhale chinthu chothandiza komanso chabwino pomanga:

  • Imakonzedwa ndi kuwombera, jekeseni, extrusion. Zokwanira kupanga mitsuko, mabotolo, makanema, zojambulazo, mbale ndi magawo.
  • Transparency ndi gloss yokhala ndi zotsatira zokulitsa.
  • Katundu wabwino kwambiri.
  • Chotchinga mpweya.
  • Zosakanikirana-zowoneka bwino.
  • Sterilizable ndi gamma ndi ethylene oxide.
  • Mtengo / magwiridwe.
  • Inayikidwa # 1 pakubwezeretsanso.
  • Opepuka

Zoyipa ndi zabwino

mitundu ya mapulasitiki

Monga zida zonse, palinso zovuta zina kuposa PET. Kuyanika ndichimodzi mwazovuta zake zazikulu. Mitundu yonse ya polyester iyenera kuyanika kuti tipewe kuwonongeka kwa katundu. Chinyezi cha polima polowa njirayi iyenera kukhala yokwanira 0.005%. Mtengo wazida ndizovuta, monganso kutentha. Zipangizo zamakono zopangira zida zopangira jekeseni zimaimira kubwezera kwabwino kutengera kupanga. Pogwiritsa ntchito nkhonya ndi extrusion, zida zodziwika bwino za PVC zitha kugwiritsidwa ntchito, zomwe zimakhala ndi magwiridwe antchito ambiri kutulutsa mitundu ndi mawonekedwe osiyanasiyana.

Kutentha kukadutsa madigiri a 70, polyester imatha kukhalabe ndi magwiridwe antchito. Zosintha zidapangidwa ndikusintha zida kuti zithandizire kudzaza. Crystalline (opaque) PET imakhala ndi kutentha kwabwino, mpaka 230 ° C. Zosavomerezeka kuti zigwiritsidwe ntchito kosatha.

Tsopano tiwunika maubwino ake ndi awa: tili ndi katundu wapadera, kupezeka bwino ndikukonzanso kwambiri. Zina mwazinthu zabwino zomwe tili nazo zimakhala zomveka, zowonekera, zowonekera, zotchinga ku mpweya kapena kununkhira, mphamvu yamphamvu, thermoformability, yosavuta kusindikiza ndi inki, kulola kuphika kwa microwave.

Mtengo wa PET wasintha kwambiri kuposa ma polima ena monga PVC-PP-LDPE-GPPS m'zaka 5 zapitazi. Masiku ano, PET imapangidwa ku North and South America, Europe, Asia, ndi South Africa. PET ikhoza kusinthidwa kuti ipange zinthu zotchedwa RPET. Tsoka ilo, chifukwa cha kutentha komwe kumachitika, RPET silingagwiritsidwe ntchito kupangira chakudya m'makampani azakudya.

Zomwe zimagwiritsa ntchito PET

Pali zinthu zosiyanasiyana zopangidwa kuchokera ku polyethylene terephthalate kapena PET. Zotsatirazi ndi zinthu zina ndi zida zopangidwa ndi thermoplastic yosinthika iyi:

  • Zotengera zapulasitiki zomwe zingasinthidwenso. Thermoplastics amagwiritsidwa ntchito kwambiri popanga zotengera kapena zakumwa, monga zakumwa zoziziritsa kukhosi ndi mabotolo amadzi. Chifukwa cha kulimba kwake ndi kuuma kwake, chakhala chinthu chogwiritsa ntchito tsiku ndi tsiku mgululi. Ngakhale zimakhudzanso kuti zitha kupanganso kwathunthu, zimathandizanso kupanga mabotolo ena ambiri apulasitiki ndi zotengera.
  • Nsalu zosiyanasiyana. PET Ndi mtundu wa pulasitiki womwe amagwiritsidwa ntchito m'makampani opanga nsalu popanga zovala zosiyanasiyana. M'malo mwake, ndi cholowa m'malo mwa nsalu kapena thonje.
  • Kanema kapena kanema. Polima wapulasitiki uyu amagwiritsidwanso ntchito popanga makanema ojambula osiyanasiyana. Ngakhale, imathandizanso popanga mapepala osindikizira a X-ray.
  • Makina opangidwa. Masiku ano, polyethylene terephthalate imagwiritsidwa ntchito popanga makina osiyanasiyana ogulitsira ndi makina a arcade.
  • Ntchito zowunikira. Amagwiritsidwa ntchito popangira nyali zamapangidwe osiyanasiyana. M'malo mwake, PET yatsimikizira kuti ndi imodzi mwazinthu zokongola kwambiri pakupanga kuyatsa, kaya kunja kapena mkati.
  • Zina zotsatsa. Mwachitsanzo, zikwangwani kapena zikwangwani zolumikizirana. Momwemonso, imagwiritsidwa ntchito ngati chinthu choyenera popanga mawonedwe m'masitolo ndi ziwonetsero kapena zochitika zosiyanasiyana zamalonda.
  • Design chilungamo ndi kusinthasintha: Chifukwa cha mawonekedwe awiriwa, ogula amatha kuwona mkati mwa zomwe amagula ndipo opanga ali ndi mwayi wowonetsa angapo.

Kukhazikika kwa PET

Pali zifukwa zingapo zazikuluzikulu zakuti ma CD a PET amawerengedwa kuti ndi osamalira zachilengedwe. Izi ndi zifukwa zake:

Kugwiritsa ntchito mphamvu ndi zida zochepa popanga

Kwa zaka zambiri, chitukuko chaukadaulo chachepetsa zofunikira pakapangidwe ka PET komanso kugwiritsira ntchito mphamvu pakupanga kwachepetsedwa. Kuphatikiza apo, kunyamula kwake kumatanthauza kuti mtengo ndi zomwe zimakhudza chilengedwe zidzachepetsedwa poyendetsa, chifukwa pamakhala zocheperako.

Kafukufuku angapo adawonetsanso kuti, poyerekeza ndi zinthu zina, ma PET omwe amalongedza amachepetsa mpweya chifukwa chopanga zinyalala zochepa komanso kugwiritsa ntchito mphamvu zochepa pazida zopangira.

Kubwezeretsanso bwino

Kawirikawiri amakhulupirira kuti zotengera za PET zitha kugwiritsidwanso ntchito kangapo, chowonadi ndichakuti ndichinthu chomwe chimatha kugwiritsidwanso ntchito kosatha ngati njira yothandiziranso itayambika, kutengera cholinga chogwiritsidwa ntchito.

Pakalipano, PET ndi pulasitiki yomwe imagwiritsidwanso ntchito kwambiri padziko lonse lapansiM'malo mwake, ku Spain, 44% yazinthu zomwe zili pamsika zimagwiritsidwa ntchito ngati ntchito ina. Peresenti iyenera kuwonjezeredwa mpaka 55% mu 2025 kutsatira malingaliro azachuma omwe amavomerezedwa ndi European Commission.

Kuphatikiza pa kugwiritsidwanso ntchito ngati chakudya, PET yobwezerezedwanso imagwiritsidwanso ntchito m'makampani opanga nsalu, magalimoto komanso mipando. Imakhalanso ndi chitetezo chogwiritsa ntchito zotengera za PET zobwezerezedwanso muzakudya ndi zakumwa. European Food Safety Agency yatsimikizira kuti ndi chinthu choyenera, ndipo imagwiritsidwa ntchito pochita malonda ndi kugwiritsa ntchito zopangira zochokera ku PET yobwezerezedwanso mumadzi ndi zakumwa zoziziritsa kukhosi ku Spain ndi Royal Decree 517/2013 imavomereza kuti chidebe chomaliza chikuyenera kukhala ndi 50% namwali PET.

Chifukwa chake, titha kunena kuti zotengera za PET ndizotetezeka komanso zosasunthika zachilengedwe, osati kokha chifukwa cha kuthekera kwawo kwakukulu kobwezeretsanso, komanso chifukwa cha mphamvu zawo pakupanga. Ndikukhulupirira kuti ndi izi mutha kuphunzira zambiri za PET komanso mawonekedwe ake.


Zomwe zili m'nkhaniyi zikutsatira mfundo zathu za malamulo okonzekera. Kuti mufotokoze cholakwika dinani Apa.

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