| Abstract [eng] |
Structured problem-solving methods were applied for modernizing polyvinylchloride tubing assembly process in company “X”, that manufactures and supplies medical devices. This final degree project aims to apply structured problem-solving techniques to modernize the PVC tubing process. In the first part the significance of usage of structured problem-solving methods in variety of fields, such as manufacturing, medical, education, environmental and business management, was explained. Moreover, the benefits and drawbacks of several methods for joining components, including solvent welding, adhesive bonding, welding, and mechanical connections were discussed in the second project part. What is more, as project experimental part, the A3 report, based on the DMAIC methodology, was applied to solve the problem of the rotary friction welding process – a narrowed welding seam connecting the catheter and the urine collection bag. The results of the study showed the dependence of the quality of the welding seam on the wear of the mechanical parts and their installation, the quality of the raw materials and the hand-folding urine collection bags. The six-week data showed that the implemented actions brought positive results: the team managed to reduce the number of defects within the target and documented the actions that allowed to control the quality of the manufactured products. For a long-term solution, it was decided to change the connection between the catheter and the urine collection bag to a snap-fit connection. To do this, a new design of the raw material was created, the equipment mechanical parts and software program were updated. The final degree project evaluated the economic benefit of the A3 study and the new tubing connection. |
