Lapho uhlanza umshini wokunyathelisa we-flexo, uhlobo lokuhlanza uketshezi oluzokhethwa kufanele lucabangele izici ezimbili: eyodwa ukuthi kufanele ifane nohlobo lweyinki esetshenzisiwe;enye ukuthi ayikwazi ukubangela ukuvuvukala noma ukugqwala kwepuleti lokuphrinta.Ngaphambi kokuphrinta, ipuleti lokuphrinta kufanele lihlanzwe ngesisombululo sokuhlanza ukuze kuqinisekiswe ukuthi ingaphezulu lepuleti lokuphrinta lihlanzekile futhi alinakho ukungcola.Ngemuva kokuvala shaqa, ipuleti lokuphrinta kufanele lihlanzwe ngokushesha ukuze kuvinjwe uyinki ophrintiwe ukuthi ome futhi uqine ebusweni bepuleti lokuphrinta.