Ngwa
Ntupu waya anyị kpara akpa nwere ọtụtụ ngwa, gụnyere sieving, nzacha na mkpuchi. Naanị chọta ngwaahịa ahụ dabara nke ọma na ngwa gị.
Anyị kwenyere na "Ezigbo ákwà waya nwere ike ikwu okwu na ntupu ọ bụla kwesịrị ịba uru". Iji mezuo nke a, anyị na-emejuputa usoro njikwa mma siri ike iji hụ na ngwaahịa anyị niile nwere ntụkwasị obi.
Ngwaahịa egosipụtara
Factorylọ ọrụ anyị na-arụpụta ntupu igwe anaghị agba nchara, ntupu waya Dutch, ntupu welded, ntupu ọla gbasaa…
Ngwọta ntupu waya otu nkwụsị
Anyị nwere atụmatụ ọhụrụ, nnukwu nrụpụta na ikike nkwado siri ike iji nye ndị ahịa anyị ihe ngwọta ahaziri, otu nkwụsị.
