| PT. Harapan Widyatama Pertiwi is one company that is engaged in the manufacture of PVC pipe, with UNILON trademark. Target percentage of the number of defective products are all 15%. This needs no improvement of his better product quality by reducing the number of defects that exist by using Statistical Process Control (SPC). DPMO for extruded and cutting process is at 27648.07 and 1828.55. Whereas the sigma level for extrudasi and cutting processes are 3:42 and 4:41. The root cause of the problem from every defect is not careful in setting dies, extruder motors not working, inaccurate in regulating dies. Recommendations for reducing this defect is a training provider and preventive maintance. |