ʻO ka hoʻonui ʻana i ka hiki ʻana mai o nā ʻili palaki

ʻOiai ʻike ʻia nā ʻili wai i kekahi manawa he huahana kūikawā - kahi koho maikaʻi loa o ka poʻe e hana a hoʻolālā paha i nā huahana paipu plastik no nā ʻōnaehana ʻoihana a i ʻole nā ​​​​mea hoʻomaʻemaʻe ultra-maʻemaʻe ma kahi - me ka manaʻo ʻaʻole i nui ka hoʻohana maʻamau o kēia mau pahu. ʻike maka. ʻO ka ʻoiaʻiʻo, ʻoi aku ka nui o ka hoʻohana ʻana o nā kīwī plastik i kēia lā e like me ka hoʻonui ʻana o nā ʻano mea hana a me nā mea hoʻolālā maikaʻi e pono ai kēlā mau mea i manaʻo nui aʻe nā ala e hoʻohana ai i kēia mau mea hana.

NA WAIWAI O PLASTIK
ʻO nā mea maikaʻi o nā kiwi plastik he ākea-ʻo ka corrosion, kemika a me ka abrasion resistance; pahee o loko; kaumaha māmā; maʻalahi o ka hoʻokomo; ka lōʻihi o ke ola; a haʻahaʻa ke kumu kūʻai o ke ola. ʻO kēia mau mea maikaʻi i alakaʻi i ka ʻae nui ʻana i nā valve plastik i nā ʻoihana kalepa a me nā noi ʻoihana e like me ka hāʻawi ʻana i ka wai, ka mālama ʻana i ka wai ʻino, ka metala a me ka hana kemika, nā meaʻai a me nā lāʻau lapaʻau, nā mea kanu mana, nā ʻaila hinu a me nā mea hou aku.
Hiki ke hana ʻia nā valve plastik mai nā ʻano mea like ʻole i hoʻohana ʻia i kekahi mau hoʻonohonoho. Hana ʻia nā kiwi plastik maʻamau me ka polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), polypropylene (PP), a me ka polyvinylidene fluoride (PVDF). Hoʻohui pinepine ʻia nā kiwi PVC a me CPVC i nā ʻōnaehana paipu e nā ʻāpana kumu hoʻoheheʻe hoʻoheheʻe ʻana, a i ʻole nā ​​ʻaoʻao wili a me nā flanged; akā, koi ʻo PP a me PVDF i ka hoʻohui ʻana i nā ʻāpana ʻōnaehana paipu, ma o nā ʻenehana wela, butt- a i ʻole electro-fusion.

ʻOiai ʻo ka polypropylene ka hapalua o ka ikaika o PVC a me CPVC, loaʻa iā ia ke kūpaʻa kemika nui loa no ka mea ʻaʻohe mea hoʻohenehene i ʻike ʻia. Hana maikaʻi ʻo PP i nā ʻakika acetic concentrated a me nā hydroxides, a ua kūpono hoʻi ia no nā hoʻonā haʻahaʻa o ka hapa nui o nā waikawa, alkalis, paʻakai a me nā kinikona he nui.

Loaʻa ʻia ka PP ma ke ʻano he pigmented a i ʻole nā ​​​​mea kūlohelohe (maoli). Hoʻohaʻahaʻa nui ʻia ka PP kūlohelohe e ka radiation ultraviolet (UV), akā ua hoʻopaʻa pono ʻia nā pūhui i ʻoi aku ma mua o 2.5% carbon black pigmentation.

Hoʻohana ʻia nā ʻōnaehana paipu PVDF i nā ʻano ʻoihana like ʻole mai ka lāʻau lapaʻau a hiki i ka mining ma muli o ka ikaika o PVDF, ka mahana hana a me ke kūpaʻa kemika i nā paʻakai, nā waikawa ikaika, nā kumu dilute a me nā mea hoʻoheheʻe he nui. ʻAʻole like me PP, ʻaʻole hoʻohaʻahaʻa ʻia ka PVDF e ka lā; akā naʻe, akaka ka plastic i ka lā a hiki ke hōʻike i ka wai i ka pāhawewe UV. ʻOiai he mea maikaʻi loa ka hoʻokumu ʻia ʻana o ka PVDF no ka maʻemaʻe kiʻekiʻe, ka hoʻohana ʻana i loko, me ka hoʻohui ʻana i kahi puaʻa e like me ka ʻulaʻula meaʻai e ʻae i ka ʻike ʻana i ka lā me ka ʻole o ka hopena maikaʻi ʻole i ke ʻano wai.