Iipropati kunye neeparitha zenkqubo yokubumba inaliti yeplastiki zichatshazelwa yimiba emininzi.Iiplastiki ezahlukeneyo kufuneka zenze iiparitha zokubumba ezifanelekileyo kwiipropathi zazo ukuze zifumane ezona mpawu zibalaseleyo.
Iindawo zokubumba zesitofu zezi zilandelayo:
Enye, izinga lokucutheka
Izinto ezichaphazela ukwenza i-shrinkage yeplastiki ye-thermoplastic zezi zilandelayo:
1.Iintlobo zeeplastiki
| HAYI. | Iplastikiigama | SukucuthekaRwatya |
| 1 | PA66 | 1%–2% |
| 2 | PA6 | 1%–1.5% |
| 3 | PA612 | 0.5%–2% |
| 4 | 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 | ABS | 0.4%–0.5% |
2.Ubungakanani kunye nesakhiwo sokubumba.Ubukhulu bodonga olugqithileyo okanye inkqubo yokupholisa engalunganga inokuchaphazela ukushwabana.Ukongezelela, ubukho okanye ukungabikho kokufakwa kunye nokuhlelwa kunye nobuninzi bokufakwa kuchaphazela ngokuthe ngqo ulwalathiso lokuhamba, ukusabalalisa ubuninzi kunye nokuxhatshazwa kokunciphisa.
3.Ifomu, ubungakanani kunye nokuhanjiswa komlomo wezinto eziphathekayo.Ezi zinto zichaphazela ngokuthe ngqo ulwalathiso lokuhamba kwezinto, ukusabalalisa ukuxinana, ukubamba uxinzelelo kunye nefuthe le-shrinkage kunye nexesha lokubumba.
Ubushushu be-4.Mold kunye noxinzelelo lwenaliti.
Ubushushu bomngundo buphezulu, ukunyibilika kwenyibilika kuphezulu, izinga lokushwabana kweplastiki liphezulu, ngakumbi iplastiki enekristale ephezulu.Ukuhanjiswa kweqondo lokushisa kunye nokuxinana kobuninzi beengxenye zeplastiki nazo zichaphazela ngokuthe ngqo ukuncipha kunye nolwalathiso.
Ukugcinwa koxinzelelo kunye nobude bexesha nazo zinefuthe ekucuthekeni.Uxinzelelo oluphezulu, ixesha elide liya kuncipha kodwa isalathiso sikhulu.Ke ngoko, xa iqondo lobushushu lokungunda, uxinzelelo, isantya sokubumba inaliti kunye nexesha lokupholisa kunye nezinye izinto zinokufaneleka ukutshintsha ukushwabana kwamalungu eplastiki.
Uyilo lokungunda ngokweentlobo ezahlukeneyo zeplastiki ukushwabana, ukutyeba eludongeni zeplastiki, imilo, ifidi inlet ifomu ubungakanani kunye nokusasazwa, ngokutsho amava ukumisela ukushwabana inxalenye nganye yeplastiki, ngoko ukubala ubungakanani umngxuma.
Kwiindawo zeplastiki ezichaneke kakhulu kwaye kunzima ukuqonda isantya sokucutheka, kufanelekile ukusebenzisa ezi ndlela zilandelayo ukuyila ukubumba:
a) Thatha ukucutheka okuncinci kwamalungu eplastiki kwidayamitha engaphandle kunye nokushwabana okukhulu ukuze ube nendawo yokuguqulwa emva kovavanyo lokungunda.
b) Uvavanyo lokungunda ukufumanisa uhlobo lwenkqubo yokuphosa, ubungakanani kunye neemeko zokwenza.
c) Ukutshintsha ubungakanani bamalungu eplastiki aza kuphinda asetyenziselwe kumiselwa emva kokulungiswa kwakhona (umlinganiselo kufuneka ube ziiyure ezingama-24 emva kokuhlutywa).
d) Guqula umngundo ngokokucutheka.
e) Ukufa kunokuphinda kuhlolwe kwaye ixabiso le-shrinkage lingatshintshwa kancinci ngokuguqula iimeko zenkqubo ngokufanelekileyo ukuhlangabezana neemfuno zamalungu eplastiki.
Isibini,Ubumanzi
- I-fluidity ye-thermoplastics idla ngokuhlalutywa ngoluhlu lwezalathisi ezifana ne-molecular weight, i-melt index, i-Archimedes spiral flow length, i-viscosity yokusebenza kunye ne-flow ratio (ubude bokuhamba / ubukhulu bodonga lweplastiki).Kwiiplastiki zegama elifanayo, iinkcukacha kufuneka zitshekishwe ukuze kuqinisekiswe ukuba ubumanzi bazo bukulungele na ukubumba inaliti.
Ngokweemfuno zoyilo lokungunda, ukumanzi kweeplastiki ezisetyenziswa ngokuqhelekileyo kunokwahlulwa ngokweendidi ezintathu:
a) I-fluidity enhle ye-PA, i-PE, i-PS, i-PP, i-CA kunye ne-polymethylthyretinoene;
b) Uluhlu oluphakathi lwe-polystyrene resin (ezifana ne-AS ABS, AS), i-PMMA, i-POM, i-polyphenyl ether;
c) IPC engenamanzi, iPVC eqinile, i-polyphenyl ether, i-polysulfone, i-polyaromatic sulfone, iplastiki yefluorine.
- Ukuguquguquka kweeplastiki ezahlukeneyo nako kuyatshintsha ngenxa yezinto ezahlukeneyo zokubumba.Imiba ephambili enempembelelo zezi zilandelayo:
a) Ubushushu.Ubushushu bezinto eziphezulu ziya kwandisa umbane, kodwa iiplastiki ezahlukeneyo zikwahlukile, i-PS (ingakumbi ukuchasana nefuthe kunye nexabiso eliphezulu le-MFR), i-PP, i-PA, i-PMMA, i-ABS, i-PC, i-CA plastic liquidity kunye nokutshintsha kobushushu.Kwi-PE, i-POM, ke ukunyuka kwamaqondo obushushu kunye nokuncipha kunempembelelo encinci kumbane wabo.
b) Uxinzelelo.Uxinzelelo lokubumba lwesitofu lunyusa ukunyibilika ngesenzo sokucheba, umbane wongeziweyo uyanda, ngakumbi i-PE, i-POM inovakalelo ngakumbi, ke ixesha loxinzelelo lokubumba inaliti ukulawula ukuhamba.
c) Isakhiwo sokufa.Njengokuthulula ifom yenkqubo, ubungakanani, ukwakheka, inkqubo yokupholisa, inkqubo yokukhupha kunye nezinye izinto ezichaphazela ngokuthe ngqo ukuhamba kwangempela kwezinto ezityhidiweyo kwi-cavity.
Uyilo lwe-Mold kufuneka lusekelwe ekusebenziseni ukuhamba kweplastiki, khetha isakhiwo esifanelekileyo.Ukubumba kunokulawula ubushushu bezinto eziphathekayo, ukushisa kwe-mold kunye noxinzelelo lwe-injection, isantya se-injection kunye nezinye izinto ukulungelelanisa ngokufanelekileyo ukuzaliswa ukuhlangabezana neemfuno zokubumba.
Ixesha lokuthumela: 29-10-21