No kekahi mau makahiki, ua hoʻokani nui nā fluoropolymers i nā ʻoihana kemika a me nā ʻoihana like e pale aku i nā mea kanu a me nā mea hana mai ka hoʻouka ʻana i nā kemika e kahi ākea ākea o ka media.ʻO kēia ke kumu no ka hāʻawi ʻana aku i ka ʻoi aku ka maikaʻi o ka pale kemika a me ke kūpaʻa wela ma mua o nā mea plastics a i ʻole nā mea elastomeric. media.ʻO kēia no ka mea hāʻawi lākou i ke kūpaʻa kemika ʻoi aku ka maikaʻi a me ke kūpaʻa wela ma mua o nā mea plastics a i ʻole nā mea elastomeric.
Ma hope o ka hoʻomohala ʻana o PTFE, ua wehe ʻia ka hoʻokomo ʻana o ka melt-processable fluorinated ethylene-propylene (FEP) ma 1960 i nā wahi noi hou loa.ʻO ka PFA, kahi polymer perfluoro-alkoxy i hoʻohana maikaʻi ʻia no 20 mau makahiki ma ke ʻano he mea lining, i kēia manawa he thermoplastic hope i PTFE, me ka like ʻana o ka wela a me ke kemika a me nā waiwai maikaʻi e pili ana i ka processability, translucency, permeation resistance a me ka ikaika mechanical. .
I ka ʻoihana kemika, hoʻohana nui ʻia nā fluoropolymers - PTFE a me PFA - ma ke ʻano o nā linings.No nā ʻano maʻalahi, e like me nā paipu, nā piko, nā ʻāpana T a i ʻole nā hui hoʻohaʻahaʻa, hoʻohana mau ʻia ka PTFE;hoʻohana ʻia ma o ka hoʻopili ʻana i ka hoʻopili, extrusion hipa kāne a i ʻole lepe wind-ing.Ma kēia mau kaʻina hana i hana mua ʻia ka PTFE;a laila hoʻopili ʻia kēia a hoʻokomo ʻia i loko o ka mea hana metala.ʻOi aku ka paʻakikī o ka hoʻohana ʻana i ka PTFE no ka hoʻopili ʻana i nā ʻāpana metala o ke ʻano paʻakikī, e like me nā kiwi a me nā pamu.ʻO ka hoʻoheheʻe Isostatic ke ala i makemake ʻia.I loko o kēia PTFE pauda ua hoʻopiha ʻia i loko o kahi i hana ʻia ma waena o ka mea hana metala a me kahi ʻeke ʻeke i hana kūikawā ʻia e kūpono i ke ʻano o ka wahi e laina ʻia.Hoʻopili mua ʻia ka pauda, a laila kaomi anu i ke ʻano i makemake ʻia.ʻO ka hope, wehe ʻia ka ʻeke ʻeke a hoʻopaʻa ʻia ka ʻāpana laina i loko o ka umu ma luna o 360?C (680?F).
ʻO ka PFA, kahi mea thermoplastic me kahi helu heheʻe i wehewehe maikaʻi ʻia, hiki ke hana ʻia ma ke ʻano o ka hoʻololi ʻana a i ʻole ka hoʻoheheʻe ʻana.Hoʻoheheʻe ʻia ka granulate i loko o ka ipu hoʻoheheʻe a i ʻole ka extruder a laila koi ʻia i loko o ka mea wela e kahi kaomi hydraulic.
Kēia 'ano hana hiki loa pololei paia-mānoanoa, me ka tolerances o?0,5 mm, ʻoiai ma nā radii paʻa a me nā ʻoki lalo.ʻAʻole pono ka hoʻopau mechanical, koe wale nō ka wehe ʻana i ka sprue a hoʻomaʻamaʻa i nā maka pili o nā flanges.
I ka hoʻohana ʻana i ka hoʻoheheʻe isostatic, akā naʻe, pono ka nui o ka hoʻopau mechanical - ma muli o ke kiʻekiʻe o ka paʻakikī o ke ʻano e hoʻopiha ʻia - e hoʻokō i nā ana i makemake ʻia me ka pololei.
Hiki ke ʻokoʻa ke ʻano o ka mānoanoa o ka pā, ʻoi aku ka nui o nā ʻano paʻakikī e like me nā hale valve.
ʻO ke komo ʻana a me ke komo ʻana
ʻAʻole like me nā metala, nā plastics a me nā elastomers e hoʻopili i nā ʻano like ʻole o ka media a lākou e launa pū ai.ʻO kēia ka hihia me nā pūhui organik.Hiki ke ukali ʻia ka absorption e ka permeation ma o ka pā paia.ʻOiai ʻaʻole ʻike ʻia kēia me nā fluoropolymers, hiki ke pale ʻia e ka mānoanoa o ka pā a i ʻole ke kau ʻana i nā mea hana e hoʻopau ai i ka hakahaka ma waena o ka lining fluoropolymer a me ka paia metala.Ua hōʻike maopopo ʻia e pili ana i ka permeation a me ka absorption, nā fluoropolymers i hoʻoheheʻe ʻia e hoʻoheheʻe ʻia e like me PFA e hōʻike ana i nā waiwai pale ʻoi aku ka maikaʻi ma mua o ka PTFE.
Kū'ē Māmā
Pono ka pale ʻana i ka ʻūhā no ka mea, i loko o nā ʻōnaehana pani o ke ʻano i hoʻohana nui ʻia i ka hana kemika, ʻo ka hāʻule ʻana o ka mahana e hana ai i kahi ʻōpala i loko o ka ʻōnaehana, ke ʻole ia e hana ana ma lalo o ke kaomi lewa.I ka hoʻohana ʻana i ka PFA he mea maʻalahi ke hoʻokō i ke kū kūʻē ʻana o ka vacuum kūpono no ka lining.?o ka ma?amau i heleuma ke kapa?i ka paia metala ma o ka huelo nūnū?nā awāwa a i ʻole nā kahawai i loko o ka
hope.
Me ka PTFE granulate i hana anu, ʻoi aku ka paʻakikī o ka hoʻokō ʻana i kahi hoʻopaʻa leo o ke kapa i loko o ka pā metala e pono ai nā kahawai nui i mea e hiki ai i ka pauka PTFE ke kahe i loko o nā ʻauwai.ʻO ka mea maʻamau, no laila, hoʻohana ʻia nā mea hoʻopaʻa paʻa ma waena o ka lining PTFE a me ka hale metala.Eia nō naʻe, ma muli o nā hiʻohiʻona anti-adhesive o nā fluoropolymers a me ke kūpaʻa wela o nā mea hoʻopaʻa paʻa, hōʻike ʻo PTFE i ke kūʻokoʻa ʻana i ka ʻūhā.
Kāohi ka maikaʻi i nā māwae a me nā haʻahaʻa
Me nā linings PTFE a me PFA, ua ana ʻia ka ikaika dielectric i mea e ʻike ai i nā hewa.Hiki i kēia ʻano hana ke kuhikuhi pono i nā māwae a me nā lua e hele i ke ala a pau i ka mea, akā, ma muli o ka resistivity kiʻekiʻe kaulana o nā fluoropolymers, ʻaʻole ia e hōʻike i nā hewa i hoʻomaka i ka 1,5 mm a i ʻole ma lalo o ka ʻili (fig. 5) .
No kēia kumu, hiki ke hoʻohana ʻia nā hoʻokolohua hou me ka hoʻohana ʻana i nā ʻano ultrasonic.ʻO kēia hoʻāʻo e ana i ka mamao mai ka ʻili o ka lining a i ka hale metala.Eia nō naʻe, ʻaʻole hiki ke hilinaʻi ʻia no ka mea ʻaʻole ia e hāʻawi i ka mānoanoa lining maoli i ka wā e loaʻa ai kahi hakahaka a i ʻole porosity.Eia kekahi, ʻaʻole hiki ke hoʻohana ʻia kēia ʻano hana ma nā ʻāpana liʻiliʻi a i ʻole nā ʻano paʻakikī liʻiliʻi me nā ʻoki lalo a me nā radii paʻa.
ʻO kekahi ala ʻē aʻe e nānā ai i nā hemahema o ka ʻili e like me nā māwae a me nā hakahaka me ka mea i kapa ʻia ʻo ?Met-L-Check?ʻano hoʻopaʻa kala.Akā ua kaupalena ʻia kēia ʻano i ka ʻike ʻana i nā hemahema o ka ʻili wale nō.
Hoʻolālā Kimia
Hiki ke nānā pono ʻia ʻo PFA, ʻo ia ka translucent.Hiki ke ʻike ʻia nā māwae ma lalo o ka ʻili me nā kumu kukui kūpono.Hiki ke nānā ʻia nā wahi hiki ʻole ke ʻike ʻia me ka hoʻohana ʻana i nā kukui kukui anuanu a me nā alakaʻi kukui fiber maʻalahi.
Hoʻohālikelike Kūʻai no nā Linings
Ma ke ʻano o nā kumukūʻai maka, ʻoi aku ka nui o ka PFA i ʻekolu manawa e like me ka PTFE.
Hiki ke uku ʻia a hoʻemi nui ʻia paha kēia hemahema, ma ke ʻano he hana o nā mea e like me ke ʻano e laina ʻia, kona nui, ka helu o nā mea hana e hoʻopaʻa ʻia a me ke ʻano hana.Hiki kēia no ka mea ʻaʻole pono ʻo PFA i ka hoʻomākaukau ʻana i ka hana lima a i ʻole hoʻopau i ka mīkini me nā poho waiwai.
ʻAʻole ʻōlelo ʻia ka hoʻohana ʻana i ka PFA no ka hoʻopaʻa ʻana i nā ʻāpana nui loa, no ka mea, ʻo ke kumu kūʻai kiʻekiʻe ke kumu kūʻai nui o ka ʻāpana.ʻO kekahi mea e hoʻomanaʻo ʻia ʻo ke kumukūʻai o nā mea hana, ʻaʻole i amortized
i ka wā e laina ʻia ai nā ʻāpana liʻiliʻi.Eia kekahi, aia nā palena kūpono i ke kaumaha o nā mea i hoʻopaʻa ʻia i hiki i nā mīkini hana ke lawelawe.
Nā hopena
ʻOi aku ma mua o 20 mau makahiki o ka ʻike me nā linings no nā ʻāpana like ʻole, e laʻa me ka valve a me nā hale pahū, ua hōʻike ʻia he nui nā pōmaikaʻi o ka PFA i ka wā kiʻekiʻe ka wela a me ke kūpaʻa kemika ka mea nui.
ʻO ka pololei a me ka mānoanoa o ka pā i hiki ke loaʻa me ka PFA kahi pōmaikaʻi nui, ʻoi aku ka maikaʻi o ka hana ʻana me ka media i manaʻo nui e hoʻopuehu.
Ua hōʻike pū ʻia ka ʻike maʻamau e hāʻawi ʻo PFA i nā waiwai pale ʻoi aku ka maikaʻi ma mua o ka PTFE.
Hōʻike nā mea hana Bromine, no ka laʻana, ʻo ka hohonu o ke komo ʻana o ka bromine i ka PFA ma kahi o hoʻokahi hapakolu ka liʻiliʻi ma mua o ka PTFE, ke ʻano like nā kūlana hana e like me ka manawa, ka mahana a me ke kaomi.
ʻO ka PTFE, ma ka ʻaoʻao ʻē aʻe, hoʻohana nui ʻia no nā ʻāpana o nā kiwi kemika a me nā mea hana kemika ʻē aʻe kahi e koi ʻia ai ka pale ʻana i ka luhi.
ʻO nā hiʻohiʻona maʻamau o ia mau noi he bellows, a me nā diaphragms i nā valve a me nā pamu.
No nā apo noho, nā plugs, nā sila a me nā ʻāpana like, ʻo PTFE kahi mea kūpono a waiwai.
ʻO kahi ʻano hou no nā ʻāpana e like me kēia ka hoʻohana ʻana i ka PTFE i hoʻololi ʻia, no ka mea, ʻoi aku kona kūpaʻa a me ka paʻakikī ma mua o ka PTFE maʻamau.
Nā Tags: PTFE, PFA, PTFE vs PFA
Ka manawa hoʻouna: Apr-01-2017