Izakhiwo kanye nemingcele yenqubo yokubunjwa komjovo wepulasitiki kuthinteka yizici eziningi.Amapulasitiki ahlukene adinga ukwenza amapharamitha okwakha afanele izakhiwo zawo ukuze athole izakhiwo ezingcono kakhulu zemishini.
Amaphuzu okubumba umjovo ami kanje:
Okokuqala, izinga lokuncipha
Izici ezithinta ukwakheka kokuncipha kwepulasitiki ye-thermoplastic zimi kanje:
1.Izinhlobo zamapulasitiki
| CHA. | Ipulasitikiigama | SukuhlehlaRwadla |
| 1 | PA66 | 1%–2% |
| 2 | PA6 | 1%–1.5% |
| 3 | I-PA612 | 0.5%–2% |
| 4 | I-PBT | 1.5%–2.8% |
| 5 | PC | 0.1%–0.2% |
| 6 | I-POM | 2%–3.5% |
| 7 | PP | 1.8%–2.5% |
| 8 | PS | 0.4%–0.7% |
| 9 | I-PVC | 0.2%–0.6% |
| 10 | I-ABS | 0.4%–0.5% |
2.Ubukhulu kanye nesakhiwo sesikhunta sokubumba.Ukushuba okweqile kodonga noma isistimu yokupholisa engeyinhle kungathinta ukuncipha.Ngaphezu kwalokho, ukuba khona noma ukungabikho kokufakwayo kanye nesakhiwo kanye nenani lokufakwa kuthinta ngokuqondile isiqondiso sokugeleza, ukusabalalisa komthamo kanye nokumelana nokuncipha.
3.Ifomu, ubukhulu kanye nokusabalalisa komlomo wempahla.Lezi zici zithinta ngokuqondile isiqondiso sokugeleza kwempahla, ukusatshalaliswa kwabantu, ukubamba ingcindezi kanye nomphumela wokuncipha kanye nesikhathi sokwenza.
4.Ukushisa kwesikhunta nokucindezela komjovo.
Izinga lokushisa lesikhunta liphezulu, ukuncibilika kokuncibilika kuphezulu, izinga lokuncipha kwepulasitiki liphezulu, ikakhulukazi ipulasitiki enobucwebe obuphezulu.Ukusatshalaliswa kwezinga lokushisa nokulingana kokuqina kwezingxenye zepulasitiki nakho kuthinta ngqo ukuncipha nokuqondisa.
Ukugcinwa kwengcindezi nobude besikhathi nakho kunomthelela ekufinyezweni.Ukucindezela okuphezulu, isikhathi eside sizoncipha kodwa isiqondiso sikhulu.Ngakho-ke, lapho izinga lokushisa lesikhunta, ingcindezi, isivinini sokubumba umjovo kanye nesikhathi sokupholisa nezinye izici zingaba ezifanele ukushintsha ukuncipha kwezingxenye zepulasitiki.
Isikhunta design ngokusho ezihlukahlukene plastic shrinkage uhla, plastic odongeni ukushuba, ijamo, feed inlet ifomu usayizi nokusabalalisa, ngokusho isipiliyoni ukunquma shrinkage ingxenye ngayinye plastic, bese ukubala usayizi cavity.
Ezingxenyeni zepulasitiki ezinemba okuphezulu futhi kunzima ukubamba izinga lokuncipha, ngokuvamile kufanelekile ukusebenzisa izindlela ezilandelayo ukuklama isikhunta:
a) Thatha ukushwabana okuncane kwezingxenye zepulasitiki kububanzi obungaphandle kanye nokuncipha okukhulu ukuze kube nendawo yokuguqulwa ngemva kokuhlolwa kwesikhunta.
b) Ukuhlolwa kwesikhunta ukuze kutholwe ifomu lesistimu yokulingisa, usayizi nezimo zokwakheka.
c) Ukushintshwa kosayizi wezingxenye zepulasitiki ezizocutshungulwa kabusha kunqunywa ngemva kokucutshungulwa kabusha (isilinganiso kufanele sibe amahora angama-24 ngemva kokukhumula).
d) Shintsha isikhunta ngokuya ngokuncipha kwangempela.
e) Ifa lingazanywa futhi futhi inani lokuncipha lingashintshwa kancane ngokushintsha izimo zenqubo ngokufanele ukuze kuhlangatshezwane nezidingo zezingxenye zepulasitiki.
Okwesibili,I-Liquidity
- I-fluidity ye-thermoplastics ngokuvamile ihlaziywa ngochungechunge lwezinkomba ezifana nesisindo samangqamuzana, inkomba yokuncibilika, ubude be-Archimedes spiral flow, i-viscosity yokusebenza kanye nesilinganiso sokugeleza (ubude bokugeleza / ukushuba kodonga lwepulasitiki).Kumapulasitiki anegama elifanayo, ukucaciswa kufanele kubhekwe ukuze kutholakale ukuthi uketshezi lwawo lukulungele yini ukubumba umjovo.
Ngokwezidingo zokuklama isikhunta, uketshezi lwamapulasitiki asetshenziswa ngokuvamile lungahlukaniswa ngezigaba ezintathu:
a) Uketshezi oluhle lwe-PA, PE, PS, PP, CA kanye ne-polymethylthyretinoene;
b) Uchungechunge lwe-polystyrene resin egelezayo emaphakathi (njenge-AS ABS, AS), i-PMMA, i-POM, i-polyphenyl ether;
c) I-PC ye-fluidity ebuthakathaka, i-PVC eqinile, i-polyphenyl ether, i-polysulfone, i-polyaromatic sulfone, ipulasitiki ye-fluorine.
- I-fluidity yamapulasitiki ahlukahlukene nayo iyashintsha ngenxa yezinto ezihlukahlukene zokwakha.Izici eziyinhloko ezinomthelela yilezi ezilandelayo:
a) Izinga lokushisa.Izinga lokushisa eliphakeme lezinto ezibonakalayo lizokwandisa i-liquidity, kodwa amapulasitiki ahlukene nawo ahlukile, i-PS (ikakhulukazi ukumelana nomthelela kanye nenani eliphakeme le-MFR), PP, PA, PMMA, ABS, PC, CA plastic liquidity ngokushintsha kwezinga lokushisa.Ku-PE, i-POM, khona-ke ukunyuka kwezinga lokushisa nokuncipha kunethonya elincane ekusetshenzisweni kwazo.
b) Ingcindezi.Ingcindezi yokubumba umjovo inyusa ukuncibilika ngesenzo sokugunda, i-liquidity nayo iyanda, ikakhulukazi i-PE, i-POM izwela kakhulu, ngakho-ke isikhathi sokucindezela kokubumba komjovo ukulawula ukugeleza.
c) Isakhiwo sefa.Njengokuthulula ifomu lesistimu, usayizi, isakhiwo, isistimu yokupholisa, isistimu ye-exhaust nezinye izici zithinta ngokuqondile ukugeleza kwangempela kwezinto ezincibilikisiwe emgodini.
Ukwakhiwa kwesikhunta kufanele kusekelwe ekusetshenzisweni kokugeleza kwepulasitiki, khetha isakhiwo esinengqondo.Ukubunjwa kungabuye kulawule izinga lokushisa lempahla, izinga lokushisa lesikhunta nokucindezela komjovo, isivinini somjovo kanye nezinye izici ukuze ulungise kahle ukugcwaliswa ukuze uhlangabezane nezidingo zokubumba.
Isikhathi sokuthumela: 29-10-21