Lo mugqa uhlinzeka ngokwenza amasokhethi epayipi le-PVC okwenziwa ngesandla nokuzenzakalelayo okuhlanganisa amasokhethi “U” noma “R”. Ikakhulukazi ilandela ulayini we-extrusion, ohambisana nemishini yokufaka izikulufu. Ingasebenza futhi ngokwehlukana. Umshini wethu wokubethela unohhavini ababili bokushisisa. Ngaphambi kokukhala, amapayipi azoshiswa kuhhavini lokushisa. Futhi lapho amapayipi ethumela insimbi, elinye ipayipi lizothunyelwa ekushisiseni. Ngakho-ke, umugqa unokukhipha okuphezulu kanye nesivinini sokusebenza esisheshayo.