Te tukanga whakaputa pepa PET

(1) Ngā rauemi mata o ngā pepa PET

Pērā i ētahi atu kirihou, ko te mahi a Pepa PET He hononga tata ki te taumaha ngota. Ko te matotoru o roto te mea e whakatau ana i te taumaha ngota. Ko te nui ake o te matotoru o roto, ko te pai ake o ngā āhuatanga ā-tinana me te matū, engari ko te ngoikore o te rere ka uaua te hanga. Ko te iti iho o te matotoru o roto, ko te ngoikore ake o ōna āhuatanga ā-tinana me te matū, ā, ko te ngoikore hoki o te kaha pānga. Nō reira, me whiriwhiri te matotoru o roto o ngā pepa mārama PET mai i te 0.8dl/g ki te 0.9dl/g.

(2) Te tukanga whakaputa.

Ko ngā taputapu whakaputa matua o te pepa mārama PET ko: te pourewa whakatioata, te pourewa whakamaroke, te extruder, te pane mīhini, te maramataka roera-toru, me te coiler.

Ko te rere o te tukanga whakaputa ko: te whakatioata rauemi mata-whakamaroke-whakaputa kirihou-whakaputa whakapūkara-tārewatanga whakapūkara-tārewatanga me te hanga-tākai hua.

Ko te taahiraa tuatahi ko te whakatioata. Ka whakamahanahia ngā poro PET, ka whakatioatatia ki roto i te pourewa whakatioata hei whakarite i ngā ngota kia rite ki te raupapa, kātahi ka whakanuia te pāmahana whakawhiti karāhe o ngā poro. Ko te kaupapa he ārai i te piri i te wā whakamaroke me te aukati i te hopper. Ko te whakatioata he taahiraa tino nui. E 30 meneti ki te 90 meneti te roa o te whakatioata, ā, he iti iho i te 149°C te pāmahana.

Ko te tuarua o ngā mahi ko te whakamaroke. Nā te mea i raro i ngā āhuatanga pāmahana teitei, ka taea e te wai te whakararu i te PET mai i te wai, ka heke iho tōna piripono, ā, ka heke iho ōna āhuatanga ā-tinana, inā koa te kaha o te pānga, i te hekenga o te taumaha ngota. Nō reira, me whakamaroke te PET i mua i te rewa me te whakaputa kia iti iho te makuku. Me iti iho i te 0.005% te makuku. Ka whakamahia he whakamaroke whakamaroke mō te whakamaroke. Nā te mea he waiora te rauemi PET, ka hanga he hononga ngota ina uru hohonu ki te mata o ngā poro. Ka noho tetahi atu wāhanga o te makuku ki roto hohonu i ngā poro, ka uaua ai te whakamaroke. Nō reira, kāore e taea te whakamahi i te hau wera noa. Me noho te tohu hukapapa o te hau wera ki raro iho i te -40C, ā, ka tukuna te hau wera ki roto i te oko whakamaroke mā roto i te porowhita kati hei whakamaroke tonu.

Ko te tuatoru o ngā mahi ko te whakapūtanga o te extrusion. Whai muri i te whakatiotanga me te whakamaroke, ka hurihia te PET hei polymer me te ira rewa mārama. He teitei te pāmahana whakapūtanga o te polymer, ā, he whaiti te awhe whakahaere pāmahana. Ka whakamahia he tīwiri ārai i hangaia mō te polyester hei wehe i ngā pirepire kāore anō kia rewa me te rewa, he mea pai tēnei hei pupuri i te tukanga kutikuti roa me te whakanui ake i te putanga o te extruder. Whakamahia he pane mīhini ngutu mate ngāwari me te tokotoko aukati rere maeneene. He āhua kōne koi te pane mīhini. Me pai te mata o te awa rere maeneene me te ngutu pokepoke kore-rakuraku. He mahi mimiti me te horoi te whakamahana o te pane mīhini. Me whakarite te āputa ngutu mate kia pai te ōrite. Ka pā tika te āputa ngutu mate ōrite o te pane mīhini ki te rerekētanga matotoru taha o te pepa me te papatahi o te maramataka. Ina whakapūtātia ki roto i ngā rau, ko ngā pāmahana e rite ana o te rohe o mua o te tinana o te waka rererangi, te rohe o waenganui o te tinana o te waka rererangi, te rohe o muri o te tinana o te waka rererangi, te whakawhiti mata, me te pane o te mīhini ko 240°C-260C, 265°C-275°C, me te 260C-265°C. , 260C-265C, 255°C-265C.

Ko te tuawhā o ngā mahi ko te whakamatao me te whakatō. I muri i te putanga mai o te rewa i te pane o te mīhini, ka tomo tika ki te maramataka hurihuri-toru hei whakamatao me te whakamātao. Ko te tawhiti i waenga i te maramataka hurihuri-toru me te pane o te mīhini ka noho tonu ki te 8cm, nā te mea ki te roa rawa te tawhiti, ka ngawari te piko me te miro o te pepa. , ka hua ake he mutunga pepa kino. Hei tāpiri, nā te tawhiti rawa, ka puhoi rawa te marara me te whakamatao o te wera, ā, ka mā ngā tioata, kāore e pai mō te whakamatao. Ko te mīhini hurihuri-toru he mea hanga ki ngā rōra o runga, o waenga me o raro. He pumau te tuaka o te rōra waenga. I te wā whakamatao me te whakamatao, ko te pāmahana o te mata rōra he 40°C-50°C. Ka taea e te tuaka o ngā rōra o runga me o raro te neke ake me te heke. Mā te nekehanga o runga me o raro o te tuaka ka whakatikatika i te āputa hurihuri. Ko ngā pāmahana o ngā rōra o runga me o raro he 30°C-60C me te 52°C-68C. Me whakarite e ngā roera e toru te tere o te hanga kia ōrite, ā, me nui ake te tere i te tere whakaputa. Ko te kaupapa he whakakore i te kaha o roto o te pepa ina wehe atu i te mata, ka ngoikore te ahotea o roto o te pepa, ka ngaro ngā kita. Ka whakatio te PET i te awhe o te 100C-250°C, ā, ka tere ake te tere whakatio i te 140°C-180°C, nō reira he torutoru hēkona noa iho te roa o te whakatio. Me tere te haere a PET mā roto i tēnei wāhi pāmahana whakatio, ā, me tino whakahaere te pāmahana o ngā roera e toru.

Ko te taahiraa tuarima ko te mahi i te kukume me te takai. Ka puta te pepa mā te roera maramataka ka tomo ki te taputapu kukume mā te roera ārahi. Ko te taputapu kukume he roera rapa hohe me te roera rapa kore mahi. Ka pēhia e te pēhanga hau ngā roera e rua hei ārai i te papatahi o te pepa nā te rauemi i te roera maramataka i te wā e tōia ana te pepa e ngā roera e rua ki te taputapu takai.

Ngā raruraru kounga noa i roto i te hanga pepa mārama PET me ā rātou otinga

(1) Ka puta he paru ira tioata i roto i te pepa. Ko ngā take ko ngā rauemi mata me ngā rauemi toenga. Kāore ngā poro PET e whakaputa i ngā paru ira tioata. Heoi, i te wā tukatuka, nā te raruraru whakamaroke me te tāpiri i ngā rauemi toenga, ka puta te raruraru nā ngā paru, ngā rauemi mata kounga iti rānei i whakaurua mai nā te taiao kino. Kāore e taea te whakakore i te wā hanga pepa.

(2) Ngā rārangi whakapae me ngā rārangi wai (ngā rārangi kiri karaka). Ko ngā tohu wai ka puta mai i te rere o te rauemi mai i te pane o te mate whakaputa ki roto i te roera maramataka nā te mea kāore he rauemi e toe ana i waenganui i ngā roera maramataka, ā, kāore te pepa e piri. He ngoikore te mata o te pepa, pērā i te kiri karaka. Ko te otinga me kitea he rauemi e toe ana i waenganui i ngā roera maramataka, ā, me huri ōrite te rauemi e toe ana. Ko ngā rārangi whakapae he hapa tukanga o te tikanga whakaputa, pērā i ngā ngaru wai o te tikanga whakaputa. Ko ngā kōhao i puta mai i te rerekētanga tere i waenganui i ngā roera maramataka e rua. Ko te otinga me whakamahi i ngā roera e toru o te maramataka roera-toru. Ka whakapai ake i te tika o te whakahaere tere roera, ā, me whakapai ake hoki te tika o te tukutahitanga hei whakaiti i ngā rārangi whakapae.

(3) He kōwhai te rau, he ira pango, he poke rānei, he āhua āwhata, he koretake te maramataka, me ētahi atu. Ko te take matua o te puta mai o ngā mirumiru i roto i te rau, kāore anō kia tino maroke ngā pirepire, ā, neke atu i te 0.005% te nui o te makuku. Mena kāore anō kia tino maroke te makuku, ka uru hohonu ki roto i ngā poro hei hanga hononga ngota, ka noho hohonu rānei ki roto i ngā poro. Mena he iti rawa te pāmahana whakamaroke, he poto rawa rānei te wā, ka pāngia te pānga whakamaroke. Mena ka puta he pupuhi ki runga i te rau, me whakarite tonu te pāmahana me te wā whakamaroke. Ko te take matua o te kōwhai o te rau, he teitei rawa te pāmahana whakamaroke, he roa rawa rānei te wā whakamaroke. Ko ngā mahi matua i tēnei wā ko te whakaiti i te pāmahana whakamaroke me te whakaiti i te wā whakamaroke. Ko tētahi atu take e kōwhai ai te rau, he teitei rawa te pāmahana rewa. I tēnei wā, me tere te whakaheke i te pāmahana rewa. Ko ngā take matua o te puta mai o ngā ira pango me ngā poke i roto i te rau, ko ngā tātari pakaru, ko ngā rauemi pirau PET toenga rānei i roto i te extruder.

Ngā wāhi whakaputa pepa mārama PET

(1) Ko ngā āhuatanga matua mō te hanga pepa mārama PET ko te whakahaere i te wā whakamaroke me te tohu hau wera. Ko te pānga whakamaroke te mea tika hei whakatau i ngā āhuatanga ā-tinana me ngā āhuatanga ā-pūkaha me te hanga o te pepa. I te wā whakamaroke, me aro nui ki te whakahaere i te pāmahana me te wā whakamaroke. Kaua te pāmahana me te wā whakamaroke e tino tiketike, kaua hoki e tino iti. Ki te kore e taea te heke o te tohu hau, me tirotiro te tātari ngota. Kāore e taea e te tātari ngota tawhito te mimiti i te makuku i te hau, ā, kāore e taea te whakatutuki i te kaupapa o te whakamaroke i ngā poro. I tēnei wā, me whakakapi te tātari ngota.

(2) Ki te neke atu te pāmahana rewa i te 280C, ka memeha, ka pirau rānei te pepa PET, nō reira me whakahaere te pāmahana rewa i raro i te 280C.

(3) Ko te āputa i waenganui i ngā ngutu o te pane o te mīhini e whakatau ana i te papatahi me te matotoru o te pepa. He mea nui te pāmahana o ngā roera e toru ki te mārama me te whakaotinga o te pepa. Me tere te karo o te PET rewa i te rohe pāmahana me te tere tioata tere. Mai i te pāmahana rewa ki raro iho i te pāmahana tioata, ka tino hira te tawhiti i waenganui i te mate me te roera maramataka.

Ko ngā painga matua o ngā pepa mārama PET ko te āhua mārama, he pai ngā āhuatanga ārai hau, he pai ngā āhuatanga tiaki, he pakari, he kaha hoki te toro atu. Kāore he mea whakau, he mea whakakirikiri rānei i roto i ngā pepa mārama PET, kāore hoki he mea kino, ā, he pai hoki ō rātou utu, nō reira e paingia ana e ngā kaihoko. Ka taea te hangarua i ngā pepa mārama PET i te wā e hangaia ana, e kawe ana, e whakamahia ana hoki. Nō reira, he nui te uara whakamahi o ngā pepa mārama PET. I roto i te tukanga whakaputa PET, me tino whai i ngā whakaritenga o te tukanga whakaputa, me whakahaere te tukanga whakamaroke me te tohu tomairangi o te hau wera, me whakahaere pai te āputa o te roera maramataka me te ōwehenga tere kukume o te waeine e whai ake nei, kia pai ake ai te kounga whakaputa.