Ubwino wa Zamankhwala;
1)Zomata zofewa komanso zolimba za co-extrusion ndizosavuta kuyika komanso zosavuta kugwa.
2)Cooper plunger imatha kutsekedwa yokha ikasinthidwa, osati yosavuta kumasula, yokhazikika komanso yokhazikika yosindikiza.
3)Nkhani yamkati imatha kufotokoza zonse, zosavuta kukhazikitsa ndi kukonza.
4)Zosankha pakuyika mabakiti kapena kuyika pamwamba.
5)Kuyika kwapamwamba ndikosavuta komanso kosiyanasiyana, chotsani makina onse okweza kuti muyike, kapena kungochotsa chingwe chosindikizira kuti muyike.
6)Makina olumikizira amkati a mipiringidzo inayi, mayendedwe osinthika, mawonekedwe okhazikika, kukakamiza kwamphamvu kwa mphepo.