Injection mold injection shine a kara roba a cikin sifar, sannan kuma kayan da suke hadewa da juna biyu a tsaye suna juyawa da dumama, filastik din yana aiki a jikin nauyi da zafi, sannu a hankali daidaiton daidaito, narkewar mannewa a ramin dukkan fadin, ƙirƙirar siffar da ake buƙata, don sanyaya da tsara tsarin.