Ko te PVC tētahi o ngā rauemi kapia e rima e whakamahia whānuitia ana, he pai rawa atu ōna āhuatanga pērā i te ātete ki te waikawa me te kawakore, te ātete ki te kakahu, te ātete ki te mura, me te ārai i te wera. I tēnei wā, kua riro ko ia te tuarua o ngā hua kirihou nui rawa atu o te ao i muri i te polyethylene.
1. Te kaha whakaputa ā-whare me te putanga o te PVC
Ko te tukanga whakaputa PVC e rua ngā ara matua: te tikanga konupūmā kāpōra me te tikanga etilena, ko te rerekētanga matua ko te tikanga whakarite o te monomer vinyl chloride.
Mai i te tirohanga o te hanga i ngā tau tata nei, kua piki haere te hanga PVC i ia tau, ā, kua uru te kaha hanga o te umanga katoa ki tētahi wāhanga whanaketanga whaitake. Kua āta ora ake te hiahia o te mākete, ā, kua piki haere tonu te hanga. E ai ki ngā raraunga mai i te Whatunga Chloroalkali o Haina, kua noho tonu te tere whakahaere whānui o te umanga PVC o Haina ki runga ake i te 50% i ngā tau tata nei.
2. Te Auahatanga Whanaketanga o te Ahumahi PVC
(1) Whakapakari i te hanganga o ngā taputapu whakauru ahumahi
Mai i te tau 2007, kua whakatakotohia e te whenua he raupapa ture e whakarato ana i ngā ture taipitopito mō te whanaketanga o te umanga PVC. I taua wā anō, e akiaki ana i te hanganga o ngā taputapu tautoko mō ngā umanga whakaputa konupūmā kāpira me te hauhā kawakore, ā, e whakapakari ana i te hanganga o ngā taputapu whakauru ahumahi. I raro i te arataki a ngā kaupapa here ā-motu o nāianei, kua noho te whakatūnga o ngā taputapu whakauru ahumahi hei ia āhua e kore e taea te karo i roto i ngā rohe o waenganui me te hauauru o Haina, he nui ngā waro, ngā maina tote, me ngā rauemi kōhatu. I raro i te tūranga o ngā taputapu whakauru, mā te whakawhirinaki ki ngā painga rauemi nui me ngā painga ōrite, ka taea te whakahaere pai i ngā utu whakaputa me te hangarua i ngā hua taha, ka whakarei ake i te whakataetae mākete me te kaha ora o te umanga.
(2) Ngā tukanga whakaputa kanorau
I roto i te whanaketanga o ngā umanga PVC ā-rohe o nāianei, kei te piki haere tonu te aro ki te kanorau o ngā tukanga taputapu whakaputa, ā, ka piki haere te hiahia mō te taumata hangarau. Kāore e taea te aukati i te ia o te kanorau tukanga. I te whanaketanga tonu o ngā tukanga whakaputa PVC ā-rohe, me āta whakamahi ngā umanga i ētahi tukanga whakaputa hou me te pupuri tonu i te tukanga konupūmā waro taketake. I taua wā anō, ka tino pai ake te hangarau whakapūhui PVC, inā koa te kaha whakaputa o ngā tauhohenga whakapūhui. Hei tāpiri, me whakauru kaha hoki ngā hangarau whakaputa matatau o tāwāhi, me te āta whakatairanga i aua hangarau hei whakapai ake i te whai huatanga ōhanga o te umanga.
Wā tuku: Hurae-28-2023
