Ngexesha lokuveliswa, xa iplastiki inyibilika ifakwe kwi-mold cavity phantsi kobushushu obuphezulu kunye noxinzelelo oluphezulu kwaye ibunjwe phantsi koxinzelelo, xa ubushushu buhla, i-melt iyaphola kwaye iqine ibe yinxalenye yeplastiki. Ubungakanani benxalenye yeplastiki buncinci kunobo be-mold cavity, ebizwa ngokuba yi-short. Izizathu eziphambili zokufinyeza zezi zilandelayo. Xa kusenziwa iplastiki, ubukhulu obunqamlezileyo bee-mold gates ezahlukeneyo zahlukile. Isango elikhulu linceda ukonyusa uxinzelelo lwe-cavity, longeze ixesha lokuvala kwesango, kwaye lenze kube lula ukuhamba kwe-melt ngakumbi kwi-cavity, ngoko ke ubuninzi benxalenye yeplastiki nabo bukhulu, ngaloo ndlela kunciphisa izinga lokufinyeza, kungenjalo kuya kwandisa izinga lokufinyeza.
Utshintsho kwisakhiwo seekhemikhali seplastiki ngexesha lenkqubo yokwenziwa. Ezinye iiplastiki zitshintsha isakhiwo sazo seekhemikhali ngexesha lenkqubo yokubumba. Umzekelo, kwiiplastiki ezisebenzisa i-thermosetting, imolekyuli ye-resin iyatshintsha ukusuka kwisakhiwo esithe ngqo ukuya kwisakhiwo esifana nomzimba. Ubunzima bevolumu yesakhiwo esifana nomzimba bukhulu kunobo besakhiwo esithe ngqo, ngoko ke umthamo wayo uphela uyafinyezwa, nto leyo ebangela ukufinyezwa. Iindawo zeplastiki ezibhityileyo ezinobukhulu obufanayo bodonga zipholiswa ngokukhawuleza kwindawo yokubumba, kwaye izinga lokufinyezwa lidla ngokuba lincinci emva kokuphola. Ixesha elide lokuba indawo yeplastiki etyebileyo enobukhulu obufanayo bodonga iphole kwindawo yokubumba, kokukhona ukufinyezwa okukhulu emva kokubola. Ukuba ubukhulu benxalenye yeplastiki buhlukile, kuya kubakho inqanaba elithile lokufinyezwa emva kokubola. Kwimeko yotshintsho olunjalo olukhawulezileyo kubukhulu bodonga, izinga lokufinyezwa nalo liya kutshintsha ngequbuliso, nto leyo ebangela uxinzelelo olukhulu lwangaphakathi.
Uxinzelelo olushiyekileyo luyatshintsha. Xa iindawo zeplastiki zibunjiwe, ngenxa yempembelelo yoxinzelelo lokubumba kunye namandla okucheba, i-anisotropy, ukuxubana okungalinganiyo kwezongezo kunye nobushushu bokubumba, kukho uxinzelelo olushiyekileyo kwiindawo zeplastiki ezibunjiweyo, kwaye uxinzelelo olushiyekileyo luya kuba luncinci kancinci kwaye lusasazeke kwakhona, nto leyo ebangela ukuba iindawo zeplastiki zibunjiwe kwakhona. Ukufinyezwa kwakhona kubizwa ngokuba yi-post-shortening.
Ixesha lokuthumela: Julayi-19-2021