Abstract: Ua wehewehe pōkole ʻia ke kumu hoʻohui keʻa, ka hoʻokaʻawale ʻana, ka hana ʻana, ka hana a me nā mea hana o ka silane cross-linked polyethylene insulating material no ka uea a me ke kaula, a me kekahi mau hiʻohiʻona o ka silane i hoʻopili maoli ʻia i ka polyethylene insulating material i ka noi a me ka hoʻohana ʻana. Hoʻokomo ʻia nā mea e pili ana i ke kūlana hoʻopili kea o ka mea.
Hua'ōlelo: Silane cross-linking; ʻO ka hoʻopili keʻa kūlohelohe; Polyethylene; ʻO ka hoʻokaʻawale; Uea a me ke kaula
Hoʻohana nui ʻia ka Silane cross-linked polyethylene cable i kēia manawa i ka uea a me ka ʻoihana uea ma ke ʻano he mea insulating no nā kaula uila haʻahaʻa. ʻO ka mea i loko o ka hana ʻana i ka uea i hoʻopili ʻia a me ke kaula, a me ka peroxide cross-linking a me ka irradiation cross-linking i hoʻohālikelike ʻia me nā mea hana e pono ai he maʻalahi, maʻalahi e hana, haʻahaʻa haʻahaʻa kumu kūʻai a me nā pono ʻē aʻe, ua lilo i mea alakaʻi no ka haʻahaʻa. -ʻo ka uwea hoʻopaʻa ʻia me ka insulation.
1.Silane kea-pili uwea mea cross-linking loina
ʻElua kaʻina hana nui i ka hana ʻana i ka polyethylene cross-linked silane: grafting a me cross-linking. Ma ke kaʻina hana grafting, nalowale ka polymer i kona H-atom ma ka tertiary carbon atom ma lalo o ka hana a ka mea hoʻomaka manuahi a me ka pyrolysis i loko o nā radical manuahi, e hana pū me ka hui - CH = CH2 o vinyl silane e hana i kahi polymer grafted i loaʻa kahi trioxysilyl ester. hui. Ma ke kaʻina hana hoʻohui keʻa, ua hydrolysed mua ka polymer graft i mua o ka wai e hana ai i ka silanol, a ʻo ka - OH condenses me ka hui Si-OH pili e hana i ka paʻa Si-O-Si, no laila e hoʻopili ai i ka polymer. macromolecules.
2.Silane cross-linked uwea mea a me kona uwea hana hana
E like me kāu e ʻike ai, aia ʻelua mau ʻanuʻu a me hoʻokahi-ʻanuʻu hana hana no nā kaula hoʻohui ʻia ʻo silane a me kā lākou mau kaula. ʻO ka ʻokoʻa ma waena o ke ʻano ʻelua ʻanuʻu a me ke ʻano ʻanuʻu hoʻokahi aia ma kahi e hana ʻia ai ke kaʻina hana grafting silane, ke kaʻina hana grafting ma ka mea hana mea uea no ke ʻano ʻelua ʻanuʻu, ke kaʻina hana grafting i loko o ka hale hana uea no ka kaʻina hana hoʻokahi. ʻO ka ʻelua-ʻanuʻu silane cross-linked polyethylene insulating mea me ka nui makeke māhele i haku ʻia me nā mea i kapa ʻia ʻo A a me B, me ka mea ʻo A ʻo ka polyethylene i hoʻopaʻa ʻia me ka silane a me ka mea B ʻo ia ka pūʻulu kumu catalyst. A laila hoʻopili ʻia ke kumu insulating i ka wai mahana a i ʻole ka mahu.
Aia kekahi ʻano o ka polyethylene insulator cross-linked silane ʻelua, kahi i hana ʻia ai ka mea A ma ke ʻano ʻokoʻa, ma ka hoʻokomo pono ʻana i ka vinyl silane i loko o ka polyethylene i ka wā synthesis e loaʻa ai ka polyethylene me nā kaulahao lālā silane.
Hoʻokahi ʻanuʻu kaʻina hana ʻelua ʻano ʻano, ʻo ke kaʻina hana kuʻuna hoʻokahi-ʻanuʻu he ʻano o nā mea maka e like me ke ʻano i ka ratio o ka ʻōnaehana kikoʻī kikoʻī kūikawā, i loko o kahi extruder kūikawā i hoʻolālā ʻia i hoʻokahi ʻanuʻu e hoʻopau ai i ka grafting a extrusion o uwea insulation core, ma keia kaʻina hana, aole granulation, aole pono no ka uwea mea kanu komo, e ka uwea hale hana e hoʻopau wale. ʻO kēia hoʻokahi ʻanuʻu silane cross-linked cable production equipment and formulation technology ua lawe ʻia mai ka ʻāina ʻē a he pipiʻi.
ʻO kekahi ʻano o ka polyethylene insulation mea hoʻokahi-step silane cross-linked i hana ʻia e nā mea hana uea, ʻo ia nā mea maka a pau e like me ke ʻano i ka ratio o kahi ala kūikawā o ka hui ʻana, pūʻulu a kūʻai ʻia, ʻaʻohe mea A a me B. mea, uwea mea kanu hiki ke pololei i loko o ka extruder e hoʻopau i kaʻanuʻu i ka manawa like grafting a extrusion o ka uwea insulation core. ʻO ka hiʻohiʻona kūʻokoʻa o kēia ʻano, ʻaʻohe pono o nā extruders kūikawā, no ka mea, hiki ke hoʻopau ʻia ke kaʻina hana grafting silane i kahi extruder PVC maʻamau, a ʻo ke ʻano hana ʻelua e hoʻopau i ka pono e hoʻohui i nā mea A a me B ma mua o ka extrusion.
3. ʻO ka haku mele ʻana
ʻO ka hoʻokumu ʻia ʻana o ka polyethylene cable silane cross-linked polyethylene cable ka mea maʻamau me ka resin material base, initiator, silane, antioxidant, polymerization inhibitor, catalyst, etc.
(1) ʻO ka resin base ma ke ʻano he haʻahaʻa haʻahaʻa polyethylene (LDPE) resin me ka melt index (MI) o 2, akā i kēia manawa, me ka hoʻomohala ʻana o ka ʻenehana resin synthetic a me nā koina kumu kūʻai, ua loaʻa pū ka linear low density polyethylene (LLDPE). hoʻohana ʻia a hoʻohana ʻia paha ma ke ʻano he resin kumu no kēia mea. He hopena koʻikoʻi nā resins ʻokoʻa i ka grafting a me ka hoʻopili ʻana ma muli o nā ʻokoʻa i loko o ko lākou ʻano macromolecular kūloko, no laila e hoʻololi ʻia ka hoʻohālikelike ʻana me ka hoʻohana ʻana i nā resins kumu like ʻole a i ʻole ke ʻano like o ka resin mai nā mea hana like ʻole.
(2) ʻO ka mea hoʻomaka maʻamau ʻo ia ka diisopropyl peroxide (DCP), ʻo ke kī ʻo ka hopu ʻana i ka nui o ka pilikia, ʻaʻole lawa ka liʻiliʻi o ke kumu ʻana i ka silane; ʻOi aku ka nui o ka polyethylene cross-linking, ka mea e hōʻemi ai i kona wai, ʻo ka ʻili o ka extruded insulation core ʻoʻoleʻa, paʻakikī ke kaomi ʻana i ka ʻōnaehana. Ma muli o ka liʻiliʻi a paʻakikī ka nui o ka mea hoʻomaka i hoʻohui ʻia, pono e hoʻopuehu like ia, no laila e hui pū ʻia me ka silane.
(3) Hoʻohana maʻamau ʻo Silane i ka vinyl unsaturated silane, me ka vinyl trimethoxysilane (A2171) a me ka vinyl triethoxysilane (A2151), ma muli o ka wikiwiki o ka hydrolysis rate o A2171, no laila e koho iā A2171 i nā poʻe hou aʻe. Pēlā nō, aia ka pilikia o ka hoʻohui ʻana i ka silane, ke hoʻāʻo nei nā mea hana kelepona i kēia manawa e hoʻokō i kona palena haʻahaʻa e hōʻemi i nā kumukūʻai, no ka mea, lawe ʻia ka silane, ʻoi aku ka pipiʻi o ke kumukūʻai.
(4) ʻO ka Anti-oxidant ka mea e hōʻoia i ka paʻa o ka hana polyethylene a me ke kaula anti-aging a hoʻohui ʻia, anti-oxidant i ke kaʻina hana grafting silane i ke kuleana o ke kāohi ʻana i ka hopena grafting, no laila ke kaʻina hana grafting, ka hoʻohui ʻana o ka anti-oxidant. e makaʻala, ka nui i hoʻohui ʻia e noʻonoʻo i ka nui o DCP e kūlike i ke koho. Ma ke kaʻina hana cross-linking ʻelua, hiki ke hoʻohui ʻia ka hapa nui o ka antioxidant i loko o ka puʻupuʻu catalyst master, hiki ke hōʻemi i ka hopena ma ke kaʻina hana grafting. Ma ke kaʻina hana cross-linking hoʻokahi, aia ka antioxidant i ke kaʻina hana grafting holoʻokoʻa, no laila ʻoi aku ka nui o ke koho ʻana i nā ʻano a me ka nui. ʻO nā antioxidants maʻamau i hoʻohana ʻia he 1010, 168, 330, etc.
(5) Hoʻohui ʻia ka polymerization inhibitor i mea e pale ai i ke kaʻina hana grafting a me ke kaʻina o nā ʻaoʻao ʻaoʻao, i ke kaʻina grafting e hoʻohui i kahi anti-cross-linking agent, hiki ke hōʻemi pono i ka hiki ʻana mai o ka C2C cross-linking, a laila e hoʻomaikaʻi ai. ʻO ka fluidity kaʻina hana, ʻo ia hoʻi, ʻo ka hoʻohui ʻana o kahi graft i nā kūlana like e hoʻomaka ʻia e ka hydrolysis o silane ma ka polymerization inhibitor hiki ke hōʻemi i ka hydrolysis o ka polyethylene grafted, e hoʻomaikaʻi i ka paʻa lōʻihi o ka mea graft.
(6) ʻO nā Catalysts he mau organotin derivatives (koe wale no ka crosslinking kūlohelohe), ʻo ka mea maʻamau ʻo dibutyltin dilaurate (DBDTL), i hoʻohui pinepine ʻia ma ke ʻano o ka masterbatch. Ma ke kaʻina hana ʻelua, ʻo ka graft (A material) a me ka catalyst master batch (B material) ua hoʻopili ʻia a hui pū ʻia nā mea A a me B ma mua o ka hoʻohui ʻia ʻana i ka extruder e pale i ka hoʻopili mua ʻana o ka mea A. I ka hihia o ka silane cross-linked polyethylene insulations, ʻaʻole i hoʻopili ʻia ka polyethylene i loko o ka pūʻolo, no laila ʻaʻohe pilikia ma mua o ka hoʻopili ʻana a no laila ʻaʻole pono e hoʻopili ʻia ka catalyst.
Eia kekahi, aia nā silanes i hoʻohui ʻia i loaʻa ma ka mākeke, ʻo ia ka hui pū ʻana o ka silane, initiator, antioxidant, kekahi mau lubricants a me nā mea anti-copper, a hoʻohana mau ʻia i hoʻokahi-step silane cross-linking method in cable plants.
No laila, ʻo ka hoʻokumu ʻana o ka polyethylene insulation cross-linked silane, ʻaʻole i manaʻo ʻia he mea paʻakikī loa ka ʻano o ia mea a loaʻa i ka ʻike pili, akā ʻo nā ʻano hana kūpono, e pili ana i kekahi mau hoʻoponopono i mea e hoʻopau ai, e koi ana i kahi piha piha. ka hoʻomaopopo ʻana i ke kuleana o nā ʻāpana i ka hoʻokumu ʻana a me ke kānāwai o kā lākou hopena i ka hana a me ko lākou manaʻo like.
I loko o nā ʻano mea like ʻole o nā mea uea, ua manaʻo ʻia ʻo silane cross-linked cable material (ʻelua ʻanuʻu a hoʻokahi ʻanuʻu paha) ʻo ia wale nō ke ʻano o nā kaʻina hana kemika i hana ʻia i ka extrusion, nā ʻano ʻē aʻe e like me ka polyvinyl chloride (PVC) cable material a polyethylene (PE) uwea mea, ka extrusion granulation kaʻina hana he kino hui kaʻina hana, a hiki ina ke kemika kea a me ka irradiation cross-linking uwea mea, ina i loko o ka extrusion granulation kaʻina hana, a extrusion nenoaiu Cable,ʻaʻohe hana kemika hiki mai. , No laila, i ka hoʻohālikelike, ka hana ʻana o ka silane cross-linked cable material a me ka extrusion insulation cable, ʻoi aku ka nui o ka mana kaʻina.
4. ʻElua-ʻanuʻu silane cross-linked polyethylene insulation kaʻina hana
ʻO ke kaʻina hana o ka silane cross-linked polyethylene insulation Hiki ke hōʻike pōkole ʻia kahi mea ma ke Kiʻi 1.
Helu 1 Ke kaʻina hana ʻelua ʻanuʻu silane cross-linked polyethylene insulating material A
ʻO kekahi mau mea koʻikoʻi i ke kaʻina hana o ʻelua-step silane cross-linked polyethylene insulation:
(1) Hoʻomaloʻo. E like me ka polyethylene resin he wahi liʻiliʻi o ka wai, i ka wā e hoʻokuʻu ʻia ai i nā wela kiʻekiʻe, e hana wikiwiki ka wai me nā hui silyl e hana i ka cross-linking, kahi e hoʻemi ai i ka wai o ka heheʻe a hana i ka pre-cross-linking. Loaʻa ka wai i ka mea i hoʻopau ʻia ma hope o ka hoʻomaloʻo ʻana o ka wai, hiki nō ke kumu i ka pre-crosslinking inā ʻaʻole wehe ʻia, a pono e hoʻomaloʻo ʻia. I mea e hōʻoia ai i ka maikaʻi o ka maloʻo, hoʻohana ʻia kahi ʻāpana maloʻo hohonu.
(2) Metering. No ka mea he mea nui ka pololei o ka hoʻokumu ʻana i nā mea, hoʻohana maʻamau ka mea kaupaona poho i lawe ʻia mai. ʻO ka polyethylene resin a me ka antioxidant e ana ʻia a hānai ʻia ma o ke awa hānai o ka extruder, aʻo ka silane a me ka mea hoʻomaka e hoʻokomo ʻia e ka wai puna wai i loko o ka pahu lua a ʻekolu paha o ka extruder.
(3) Extrusion grafting. Hoʻopau ʻia ke kaʻina hana grafting o silane i ka extruder. ʻO nā hoʻonohonoho kaʻina o ka extruder, me ka mahana, ka hui pū ʻana, ka wikiwiki a me ka helu hānai, pono e hahai i ka loina e hiki ke hoʻoheheʻe ʻia ka mea ma ka ʻāpana mua o ka extruder a hui pū ʻia, ke makemake ʻole ʻia ka decomposition premature o ka peroxide. , a pono e hoʻopau piha ʻia nā mea ʻaʻahu piha i ka ʻāpana ʻelua o ka extruder a hoʻopau ʻia ke kaʻina hana grafting, Hōʻike ʻia nā wela o ka pauku extruder maʻamau (LDPE) ma ka Papa 1.
Papa 1 Nā wela o nā ʻāpana extruder ʻelua ʻanuʻu
| Wahi hana | Wahi 1 | Wahi 2 | Māhele 3 ① | Māhele 4 | Māhele 5 |
| Ka wela P °C | 140 | 145 | 120 | 160 | 170 |
| Wahi hana | Wahi 6 | Māhele 7 | Wahi 8 | Māhele 9 | Make ka waha |
| Ka wela °C | 180 | 190 | 195 | 205 | 195 |
① kahi i hoʻohui ʻia ai ka silane.
ʻO ka wikiwiki o ka wili extruder e hoʻoholo i ka manawa noho a me ka hopena hui ʻana o ka mea i loko o ka extruder, inā pōkole ka manawa noho, ʻaʻole i pau ka decomposition peroxide; inā lōʻihi ka manawa noho, piʻi ka viscosity o ka mea extruded. Ma keʻano laulā, pono e hoʻomalu ʻia ka manawa noho awelika o ka granule i ka extruder i ka hoʻomaka decomposition hapalua o ke ola o 5-10 mau manawa. ʻO ka wikiwiki o ka hānai ʻana ʻaʻole wale kekahi hopena i ka manawa noho o ka mea, akā i ka hui ʻana a me ka ʻohi ʻana o ka mea, koho i kahi wikiwiki hānai kūpono he mea nui loa.
(4) Hoʻopili. Pono e hoʻopili ʻia nā mea hoʻokalakupua i hoʻopaʻa ʻia i ka silane ʻelua-ʻanuʻu i loko o nā ʻeke alumini-plastic composite i ka ea pololei e hoʻopau i ka makū.
5. One-step silane cross-linked polyethylene insulating material production process
One-step silane cross-linked polyethylene insulation material ma muli o kona grafting kaʻina mea i loko o ka uwea hale hana extrusion o ka uwea insulation core, no laila, o ke uwea insulation extrusion wela oi loa kiʻekiʻe ma mua o ke kaʻina hana elua. ʻOiai ua noʻonoʻo pono ʻia ke ʻano hoʻoheheʻe polyethylene hoʻokahi-ʻanuʻu i ka hoʻopuehu wikiwiki ʻana o ka mea hoʻomaka a me ka silane a me ka ʻāʻili waiwai, akā pono e hōʻoia ʻia ke kaʻina hana grafting e ka mahana, ʻo ia ka polyethylene cross-linked polyethylene one-step silane cross-linked polyethylene. ʻO ka mea kanu hana insulation i koʻikoʻi i ke koʻikoʻi o ke koho kūpono o ka wela extrusion, hōʻike ʻia ka mahana extrusion maʻamau i ka Papa 2.
Papa 2 Hoʻokahi-ʻanuʻu extruder wela o kēlā me kēia wahi (hui: ℃ )
| ʻĀpana | Wahi 1 | Wahi 2 | Māhele 3 | Māhele 4 | Flange | Poʻo |
| Mahana | 160 | 190 | 200～210 | 220～230 | 230 | 230 |
ʻO kēia kekahi o nā nāwaliwali o ke kaʻina polyethylene cross-linked silane hoʻokahi, ʻaʻole pono i ka wā e hoʻokuʻu ai i nā kaula i ʻelua mau ʻanuʻu.
6.Production lako
ʻO ka mea hana hana he mea hōʻoia koʻikoʻi o ka mana kaʻina hana. Pono ka hana ʻana o nā kaula hoʻopaʻa ʻia ʻo silane i kahi kiʻekiʻe kiʻekiʻe o ke kaʻina hana pololei, no laila, ʻoi aku ka nui o ke koho ʻana i nā lako hana.
ʻO ka hana ʻana o ʻelua-step silane cross-linked polyethylene insulation material He mea hana mea hana, ʻoi aku ka nui o ka home isotropic parallel twin-screw extruder me ke kaupaona ʻole i lawe ʻia mai, hiki i ia mau mea ke hoʻokō i nā koi o ke kaʻina hana pololei, ke koho o ka lōʻihi a me ke anawaena o ka māhoe-screw extruder e hōʻoia i ka mea noho manawa, ke koho ana i laweia mai kaumaha kaumaha ole e hōʻoia i ka pololei o na mea. ʻOiaʻiʻo he nui nā kikoʻī o nā lako e pono e hāʻawi ʻia i ka nānā piha.
E like me ka mea i ʻōlelo ʻia ma mua, ʻo ka hoʻokahi-step silane cross-linked cable production equipment in the cable plant ua lawe ʻia mai, pipiʻi, ʻaʻohe mea hana like ʻole nā mea hana hale, ʻo ke kumu ka nele o ka launa pū ʻana ma waena o nā mea hana a me nā mea noiʻi a me nā mea noiʻi.
7.Silane maoli cross-linked polyethylene insulation mea
Hiki ke hoʻopaʻa ʻia nā mea hoʻokaʻawale polyethylene kūlohelohe ʻo Silane i hoʻomohala ʻia i nā makahiki i hala iho nei ma lalo o nā kūlana kūlohelohe i loko o kekahi mau lā, me ka ʻole o ka mahu a i ʻole ka wai mehana. Ke hoʻohālikelike ʻia me ke ʻano kuʻuna silane cross-linking, hiki i kēia mea ke hoʻemi i ke kaʻina hana no nā mea hana kelepona, hoʻemi hou i nā kumukūʻai hana a hoʻonui i ka pono hana. Ua ʻike nui ʻia a hoʻohana ʻia ʻo Silane e nā mea hana kelepona.
I kēia mau makahiki i hala iho nei, ua oʻo a ua hana ʻia ka silane kūlohelohe kūlohelohe polyethylene insulation i loko o ka nui, me kekahi mau mea maikaʻi i ke kumukūʻai i hoʻohālikelike ʻia me nā mea i lawe ʻia mai.
7. 1 Nā manaʻo hoʻohua no ka silane i hoʻopili maoli ʻia i ka polyethylene insulations
Hoʻokumu ʻia nā insulations polyethylene kūlohelohe ʻo Silane ma kahi kaʻina hana ʻelua, me ka hoʻohālikelike like ʻana me ka resin base, initiator, silane, antioxidant, polymerisation inhibitor a me catalyst. Hoʻokumu ʻia ka hoʻokumu ʻana i nā mea hoʻokalakupua polyethylene i hoʻopili ʻia ma ke ʻano o ka hoʻonui ʻana i ka nui o ka grafting silane o ka mea A a me ke koho ʻana i kahi mea hoʻoheheʻe ʻoi aku ka maikaʻi ma mua o ka silane wai mehana polyethylene insulators. ʻO ka hoʻohana ʻana i nā mea A me kahi kiʻekiʻe kiʻekiʻe o ka silane grafting rate i hui pū ʻia me kahi catalyst ʻoi aku ka maikaʻi e hiki ai i ka silane cross-linked polyethylene insulator ke hoʻokuʻi koke i nā haʻahaʻa haʻahaʻa a me ka lawa ʻole o ka wai.
ʻO nā mea A no ka silane i lawe ʻia mai nā insulators polyethylene i hoʻopili maoli ʻia e ka copolymerization, kahi e hiki ke hoʻomalu ʻia ka ʻike silane ma kahi kiʻekiʻe, akā paʻakikī ka hana ʻana o nā mea A me nā kiʻekiʻe grafting kiʻekiʻe ma ke grafting silane. Pono e hoʻololi a hoʻololi ʻia ka resin base, initiator a me ka silane i hoʻohana ʻia i loko o ka meaʻai.
He mea koʻikoʻi nō hoʻi ke koho ʻana i ke kūʻē a me ka hoʻoponopono ʻana i kāna dosage, no ka mea, ʻo ka piʻi ʻana o ka grafting rate o ka silane e hiki ke alakaʻi i nā hopena ʻaoʻao crosslinking CC hou aku. I mea e hoʻomaikaʻi ai i ka hoʻoheheʻe ʻana a me ke ʻano o ka ʻili o ka mea A no ka extrusion cable ma hope, pono ka nui o ka polymerization inhibitor e pale pono i ka CC crosslinking a ma mua o ka crosslinking.
Eia hou, he kuleana koʻikoʻi nā catalysts i ka hoʻonui ʻana i ka helu crosslinking a pono e koho ʻia ma ke ʻano he catalysts kūpono i loaʻa nā mea hoʻololi metala ʻole.
7. 2 Ka manawa hoʻopaʻa o ka silane i hoʻopaʻa maoli ʻia i ka polyethylene insulations
ʻO ka manawa e pono ai e hoʻopau i ka hoʻopaʻa ʻana o ka silane kūlohelohe polyethylene i hoʻopaʻa ʻia ma kona ʻano kūlohelohe e hilinaʻi ʻia i ka mahana, ka haʻahaʻa a me ka mānoanoa o ka papa insulation. ʻO ke kiʻekiʻe o ka mahana a me ka haʻahaʻa, ʻoi aku ka lahilahi o ka mānoanoa o ka papa insulation, ʻoi aku ka pōkole o ka manawa crosslinking e pono ai, a ʻoi aku ka lōʻihi o ka ʻaoʻao. ʻOiai ʻokoʻa ka mahana a me ka haʻahaʻa mai kēlā me kēia ʻāina a i kēlā me kēia kau, ʻoiai ma kahi hoʻokahi a i ka manawa like, ʻokoʻa ka mahana a me ka haʻahaʻa i kēia lā a me ka lā ʻapōpō. No laila, i ka wā o ka hoʻohana ʻana i ka mea, pono ka mea hoʻohana e hoʻoholo i ka manawa cross-linking e like me ka mahana a me ka haʻahaʻa kūloko a me ka haʻahaʻa, a me ka kikoʻī o ke kaula a me ka mānoanoa o ka papa insulation.
Ka manawa hoʻouna: ʻAukake-13-2022