Polyethylene (PE)
1. Te Mahi a te PE
Ko te PE te kirihou tino hangaia i roto i ngā kirihou, me te mātotoru tata ki te 0.94g/cm3. Ko tōna āhua he mārama, he ngawari, he kore paitini, he iti te utu, ā, he ngāwari ki te tukatuka. He pūhui tioata noa te PE, ā, he āhuatanga whakaheke-muri. He maha ngā momo, ko ngā mea e whakamahia whānuitia ana ko te LDPE he ngawari ake (e mōhiotia whānuitia ana ko te rapa ngohengohe, ko te rauemi putiputi rānei), ko te HDPE e mōhiotia whānuitia ana ko te rapa ngohengohe mārō, he mārō ake i te LDPE, he iti te whakawhiti mārama me te tioata teitei; he tino pai te mahi a te LLDPE, he rite ki ngā kirihou hangarau. He pai te ātete matū o te PE, kāore e ngāwari te waikura, ā, he uaua ki te tā. Me whakahāwea te mata i mua i te tānga.
2. Te Whakamahinga o te PER
HDPE: ngā putea kirihou mō te takai, ngā mea e hiahiatia ana i ia rā, ngā peere, ngā waea, ngā taonga takaro, ngā rauemi hanga, ngā ipu
LDPE: ngā putea kirihou mō te takai, ngā putiputi kirihou, ngā taonga takaro, ngā waea auau-teitei, ngā tuhinga, me ētahi atu.
3. Ngā āhuatanga o te tukanga PE
Ko te āhuatanga tino kitea o ngā wāhanga PE ko tōna tere whakaheke nui i te hanga, ā, he ngāwari ki te whakaheke me te whakarerekē i te āhua. He iti te mimiti wai o ngā rauemi PE, ā, kāore e hiahiatia kia whakamarokehia. He whānui te awhe pāmahana tukatuka o te PE, ā, kāore e ngāwari te pirau (ko te pāmahana pirau he tata ki te 300°C). Ko te pāmahana tukatuka he 180 ki te 220°C. Mena he teitei te pēhanga werohanga, ka teitei te mātotoru o te hua, ā, ka iti te tere whakaheke. He reo te rere o te PE, nō reira me roa ake te wā pupuri, ā, me pupuri tonu te pāmahana o te hanga (40-70°C).
Ko te nui o te whakatiotanga o te PE e pā ana ki ngā āhuatanga o te tukanga whakakoi. He teitei ake te pāmahana totoka. Ko te iti iho o te pāmahana o te pokepokea ai, ko te iti iho o te whakatiotanga. I te wā o te tukanga whakatiotanga, nā te anisotropy o te whakahekenga, ka puta te kukū o te ahotea ā-roto, ā, he ngāwari te whakapē me te pakaru o ngā wāhanga PE. Mā te tuku i te hua ki roto i te kaukau wai i roto i te wai wera 80℃ ka taea te whakangāwari i te ahotea ā-roto ki tētahi taumata. I te wā o te tukanga whakakoi, me teitei ake te pāmahana o te rauemi i te pāmahana o te pokepokea ai. Me iti rawa te pēhanga werohanga, me te whakarite kia pai te kounga o te wāhanga. Me tere, kia ōrite hoki te whakamatao o te pokepokea ai, ā, me wera te hua ina wetekina.
Polypropylene (PP)
1. Te Mahi a te PP
He pūhui tioata te PP, ko tōna matotoru he 0.91 karamu/cm3 anake (he iti iho i te wai). Ko te PP te mea māmā rawa atu i roto i ngā kirihou e whakamahia whānuitia ana. I roto i ngā kirihou whānui, ko te PP te mea tino ātete ki te wera, me te pāmahana whakarerekētanga wera o te 80 ki te 100°C, ā, ka taea te kohuatia ki te wai kohua. He pai te ātete ki te pakaru ahotea me te roa o te piko me te ngenge, ā, e mōhiotia whānuitia ana ko te "100% kirihou".
He pai ake te mahi whānui a te PP i ērā o ngā rauemi PE. He mama, he pakari, he ātete ki ngā matū ngā hua PP. Ngā ngoikoretanga o te PP: he iti te tika o ngā āhuatanga, he koretake te pakari, he ngoikore te ātete ki te huarere, he ngāwari ki te whakaputa "kino parahi", he āhuatanga whakaheke i muri i te mimiti, ā, he ngāwari ngā hua ki te tawhito, ki te pakarukaru, ki te whakapēhea.
2. Te Whakamahinga o te PP
Ngā taonga o te whare, ngā taupoki kohua mārama, ngā paipa tuku matū, ngā ipu matū, ngā taonga hauora, ngā tuhinga tuhituhi, ngā taonga tākaro, ngā miro, ngā kapu wai, ngā pouaka hurihuri, ngā paipa, ngā inihi, me ētahi atu.
3. Ngā āhuatanga tukanga o te PP:
He pai te rere o te PP i te pāmahana rewa, ā, he pai hoki te mahi whakakoi. E rua ngā āhuatanga o te PP:
Tuatahi: ka tino heke te matotoru o te rewa PP i te pikinga o te tere kutikuti (kaore i te tino pāngia e te pāmahana);
Tuarua: He teitei te taumata o te takotoranga ngota, ā, he nui te tere mimiti.
He pai ake te pāmahana tukatuka o te PP i te 200~250℃. He pai te pumau o te wera (ko te pāmahana pirau he 310℃), engari i te pāmahana teitei (280~300℃), ka pirau pea mēnā ka noho roa ki roto i te oko. Nā te mea ka tino heke te matotoru o te PP me te pikinga o te tere kutikuti, mā te whakanui ake i te pēhanga werohanga me te tere werohanga ka pai ake tōna rere; hei whakapai ake i te whakarerekētanga me te pakaru o te whakahekenga, me whakahaere te pāmahana o te pokepokea ai i roto i te awhe o te 35 ki te 65°C. Ko te pāmahana tioata he 120~125℃. Ka taea e te PP rewa te haere mā roto i tētahi āputa pokepokea ai he tino whaiti, ka hanga he mata koi. I te wā o te tukanga rewa, me mimiti e te PP te nui o te wera rewa (he wera motuhake nui ake), ā, ka tino wera te hua i muri i te putanga mai i te pokepokea ai. Kāore e hiahiatia kia whakamarokehia ngā rauemi PP i te wā tukatuka, ā, he iti iho te whakahekenga me te tioata o te PP i ērā o te PE.
Wā tuku: Hakihea-28-2023
