What is the main job of a blow molder? Is it hard work?

I work in a factory that produces blow molding products, but there is no blow molding position. There are only craftsmen responsible for the production process. The salary is not bad. The third shift is relatively hard, but the day shift is okay. There are also workers who trim the edges of blow molded products. They work 8 hours a day and stand all the time. It is quite hard, but there is no pressure. They get off work at the same time. Which one are you asking about?