Poly(ethylene terephthalate) (PET)He rauemi takai e whakamahia whānuitia ana e te umanga kai me te inu; nō reira, kua rangahauhia tōna pumau wera e te tini o ngā kairangahau. Ko ētahi o ēnei rangahau kua aro nui ki te whakaputanga o te acetaldehyde (AA). He mea āwangawanga te noho o te AA i roto i ngā tuhinga PET nā te mea he pāmahana kohua kei te pāmahana rūma (21_C), kei raro iho rānei. Mā tēnei pāmahana iti ka taea e ia te horapa mai i te PET ki te āhuarangi, ki tētahi hua rānei i roto i te ipu. Me whakaiti te horapa o te AA ki te nuinga o ngā hua, nā te mea e mōhiotia ana ko te reka/kakara o te AA e pā ana ki ngā reka o ētahi inu me ngā kai kua takaihia. He maha ngā huarahi kua pūrongohia hei whakaiti i te nui o te AA e puta ana i te wā e rewa ana, e tukatuka ana hoki i te PET. Ko tētahi huarahi ko te arotau i ngā āhuatanga tukatuka e hangaia ana ngā ipu PET. Kua whakaatuhia e ēnei taurangi, tae atu ki te pāmahana rewa, te wā noho, me te tere kutikuti, he tino pā ki te whakaputanga o te AA. Ko tētahi atu huarahi ko te whakamahi i ngā kapia PET kua whakaritea motuhake hei whakaiti i te whakaputanga o te AA i te wā e hangaia ana ngā ipu. E mōhiotia whānuitia ana ēnei kapia ko ngā "kapia PET kounga wai". Ko te tuatoru o ngā huarahi ko te whakamahinga o ngā tāpiringa e mōhiotia ana ko ngā kaihoko whakangaro acetaldehyde.

Kua hangaia ngā kaihoroi AA hei taunekeneke ki tētahi AA e puta ana i te wā e tukatukahia ana te PET. Kāore ēnei kaihoroi e whakaiti i te pirau PET, i te hanganga acetaldehyde rānei. Heoi, ka taea e rātou te whakawhāiti i te nui o te AA ka taea te horapa atu i roto i tētahi ipu, ā, ka whakaiti i ngā pānga ki ngā ihirangi kua tākaihia. E whakaarohia ana ka puta ngā taunekeneke o ngā kaihoroi me te AA i runga i ngā tikanga rerekē e toru, i runga i te hanganga ngota o te kaihoroi motuhake. Ko te momo tuatahi o te tikanga kaihoroi he tauhohenga matū. I tēnei take ka tauhohe te AA me te kaihoroi ki te hanga i tētahi hononga matū, ka hangaia he hua hou, neke atu rānei. I te momo tuarua o te tikanga kaihoroi ka hangaia he matatini whakauru. Ka puta tēnei ina tomo te AA ki te kōhao o roto o te kaihoroi, ā, ka puritia ki te wāhi e te hononga hauwai, ka hua ake he matatini o ngā ngota motuhake e rua e honoa ana mā roto i ngā hononga matū tuarua. Ko te momo tuatoru o te tikanga kaihoroi ko te hurihanga o te AA ki tētahi atu momo matū mā roto i tana taunekeneke ki tētahi whakakorikori. Mā te hurihanga o te AA ki tētahi matū rerekē, pērā i te waikawa acetic, ka piki ake te pāmahana koropupū o te heke, ā, ka whakaiti i tōna kaha ki te whakarerekē i te reka o te kai, o te inu rānei kua tākaihia.