ʻEkolu ʻano polypropylene, a i ʻole ka copolymer randompaipu polypropylene, ua kapa ʻia ʻo ia e ka pōkole PPR. Hoʻohana kēia mea i ka wili wela, loaʻa iā ia nā mea hana wili a me nā mea ʻoki kūikawā, a he plasticity kiʻekiʻe. He kūpono nō hoʻi ke kumukūʻai. Ke hoʻohui ʻia kahi papa insulating, hoʻomaikaʻi ka hana insulation a ʻo ka paia paipu, koe wale nō nā hui ma waena o nā uea o loko a me waho, he laumania loa hoʻi.

Hoʻohana pinepine ʻia ia i nā paipu i kanu mua ʻia i loko o nā luawai hohonu a i ʻole nā ​​​​​​pā i hoʻokomo ʻia.Paipu PPRhe ola lawelawe a hiki i 50 mau makahiki, kūpono ke kumukūʻai, paʻa ka hana, kūpaʻa i ka wela a me ka mālama ʻana i ka wela, kūpaʻa i ka pala, laumania a ʻaʻole e scaling ma ka paia o loko, palekana a hilinaʻi hoʻi i loko o ka ʻōnaehana pipeline. No ka hōʻoia ʻana i ka palekana o ka ʻōnaehana, pono nā lako hana akamai a me nā limahana akamai no ke kūkulu ʻana, nona nā koi ʻenehana kiʻekiʻe.

ʻO nā waihoʻoluʻu mālie a like—ma kahi o nā leo loli i loaʻa i nā paipu wai ʻē aʻe—e hāʻawi i kaPaipu wai PP-Rhe ʻano hoihoi a me ke kala. (Manaʻo pinepine nā mea kūʻai aku ʻo ke keʻokeʻo ke kala maikaʻi loa no nā paipu PP-R, akā ʻaʻole ke kala ke ana no ka hoʻoholo ʻana i ka maikaʻi; ʻokoʻa ke ʻano o nā paipu wai PP-R mai nā paipu PP-R, a ʻaʻohe pili o ke kala o ka paipu wai me ia (aia kekahi mau kala ʻē aʻe i hoʻohui ʻia me ka masterbatch kala). Hiki ke hana ʻia kekahi kala inā aia ka masterbatch kala, a ʻaʻole ia e hoʻohaʻahaʻa a hoʻopilikia paha i ka maikaʻi o ka PP. No laila, ʻaʻohe mea pili i ke kala o ka paipu wai.

Ma keʻano laulā, hiki ke hoʻohana ʻia nā mea maka PP-R maʻemaʻe wale nō e hana i nā waiwai keʻokeʻo. No ka laʻana, ʻoiai ua hui pū ʻia nā huahana kala ʻē aʻe i hana ʻia me nā masterbatches kala me nā mea hana hou ʻia, nā mea ʻōpala, a me nā mea kihi, ʻaʻole palupalu a ʻaʻole like ke kala o nā huahana i hana ʻia ma ka hoʻohui ʻana i nā mea hana hou ʻia, nā mea ʻōpala, a me nā mea kihi. ʻAʻole e hoʻopilikia ʻia ke kala o ka huahana e nā mea i hoʻohana ʻia, a pēlā aku. Pono e kīnā ʻole a pālahalaha nā ʻili o loko a me waho o ka huahana; ʻaʻole ʻae ʻia nā hemahema e like me nā pehu ea, nā lua ʻālohilohi, nā ʻauwaha, a me nā mea haumia.

ʻO nā mea kumu a pau no nā paipu wai PP-R maikaʻi he PP-R. (me ka ʻole o nā mea hoʻohui). Maʻemaʻe ke ʻano, me kahi ʻili laumania a me ka lima ʻoluʻolu. Manaʻo palupalu nā paipu PP-R hoʻohālike. Ma keʻano laulā, ʻoi aku ka maʻalahi o nā ʻāpana ʻino i ka hoʻokomo ʻana i nā haumia; ʻo ka polypropylene ka mea nui o nā paipu PP-R. He ʻala ʻē nā paipu maikaʻi ʻole, ʻoiai ʻaʻole nā ​​​​paipu maikaʻi. ʻO ka mea maʻamau, hui pū ʻia ka polyethylene ma mua o ka polypropylene.

ʻO ka mahana maʻamau o ka hoʻoheheʻe ʻana no nā paipu PP-R ma waena o 260 a me 290°C. E ʻoi aku ka maikaʻi o ka hōʻoia ʻana o ka maikaʻi o ka hoʻoheheʻe ʻana ma kēia mau mahana. Hiki i ka huahana ke komo maʻalahi i loko o ke poʻo make hoʻoheheʻe i ka wā o ka hoʻoheheʻe ʻana inā maʻamau nā palena hoʻoheheʻe. Eia kekahi, ua aneane wai nā nodules hōʻiliʻili fusion o ka huahana, e hōʻike ana ʻaʻole i hana ʻia me nā mea maka PP-R maoli.

ʻAʻole hoʻi i hana ʻia ka huahana mai nā mea maka PP-R maoli inā hiki i nā nodules hōʻiliʻili wili ke hoʻomaʻalili a paʻa koke (maʻamau i loko o 10 kekona). ʻO kēia no ka mea he hopena mālama wela ikaika ko PP-R, ʻo ia hoʻi, e lohi maoli kona wikiwiki hoʻomaʻalili.
E nānā e ʻike inā ua kaha ʻia nā mea hoʻopili paipu a inā ua kekee ke anawaena o loko o ka paipu. ʻAʻole hiki ke kaha ʻia ke anawaena o loko o kahi paipu PP-R maikaʻi, a ʻaʻole maʻalahi ke pelu ʻia.