Amagwiritsidwa ntchito kwambiri pazinthu monga mbale zowunikira zowunikira, mbale zowunikira kumbuyo - makina owunikira ndi ma board otsatsa, komanso mapepala owoneka bwino monga a makabati owonetsera, zamagetsi ogula, zida zapakhomo, mafelemu ndi zida zomangira, ndipo ndizoyenera njira zopangira ma extrusion ndi jekeseni.
