RELATION BETWEEN WATER PENETRATION BEHAVIOR AND PRODUCT QUALITY IN WATER-ASSISTED INJECTION MOLDING (WAIM) AT DIFFERENT PROCESS PARAMETERS

摘要

Measurements of water pressure and water volume flow rate during water injection were related to both the part weight and a visual inspection of part cross-section at different process settings. It was found that the residual wall thickness (RWT) as well as the formation of part defects depend on the polymer resistance, since the variation of this latter leads to a change in both the water bubble width and velocity. Therefore, product quality depends on process parameters such as water volume flow rate and water injection delay time, which have an influence on this polymer resistance.