THE IMPACT OF THE THICKNESS OF THE WALL OF OPTICAL LENSES ON THE STABILITY OF THEIR PRODUCTION PROCESS

Abstract

The article compares the stability of the production process of two plastic optical lenses produced by the injection molding process. Moreover, it evaluates the effects caused by using very thick walls and very thin walls in plastic optical lenses. In our work, we compared lenses that differed only in the maximum wall thickness. In the experiments, we simulated the conditions of changing pressure and injection speed. The common process parameters that the organization uses by default were used as a basis. We changed the after-pressure and injection pressure to 102%, 105%, 98%, and 95% in the experiments. The results evaluate the proportion of non-conforming products (scrap) that appertain to each change in the parameters of production. From the results, we concluded that lenses with greater wall thickness have a narrower process window than thinner lenses. Based on these findings, we proposed the adoption of organizational measures in the production of plastic lenses.