Improvement of Production Quality by using Six Sigma Technique: Applied Study in the Medical Syringes Factory – Babylon

Abstract

As a result of lack of conformity of the outer diameter of the filling piston ofplastic syringe to the specifications set out in the design map and the increased demandfor its products from the Medical syringes factory – Babylon. The research conductsthe necessary investigations and analysis of the production process as most of the unitsrejected by fact that the outer diameter of the filling piston is smaller than the minimumspecification and units returned to work due to the fact that the outer diameter largerthan the upper limit of the specification.
 The research aims firstly to examine the outer diameter of the filling pistonthrough the use of the control chart of the variables represented by the average , and itsimpact on the production process capability because the increase in diameterspecification leads to an increase in the pressure imposed on the lining of the cylinder,causing difficulty in piston movement and a decrease in diameter specification whichleads to loose the process capability to prevent leakage of fluid, causing air to enter aswell as to speed the movement of the piston, which negatively affects human life inboth cases. Secondly, study the possibility of improving the production processcapability by using advanced levels of the sigma.The results showed that the production process in the case of a disciplined andfollows a normal distribution, the pointer of the production process capability is equalto (0.55) and the factory works within the level of Sigma equal to (1.65). Theproportion of a damaged product is (15.8 %) and rework (0.99 %).In order to reduce the proportion of damaged product, this paper introduces aquality plan depending on ( ±0.025) as tolerance limits instead of ( ±0.05) to increasesigma level by 202%.