Effect of Alkali Environment on the Tensile Strength of A Welding Line In an Injection Molding Part

摘要

To observe the effect of alkaline concentration on weld line strength, after the molding process, the molded part was soaked in alkaline solution. Alkaline solutions with pH levels of 7.0, 8.0, 9.5, 11.5, J2.5, and 13.0 were applied for a period of 1 month, 2 months, 3 months, 4 months, and 5 months. The experimental results show that with the same soaking time, the strength force is reduced with higher alkaline concentration. In the case of pH 13.0, the strength decreased rapidly in the first month and changed from 34.75 to 30.39 MPa (about 9.1%).