Below is a list of Blow Molders manufacturers from St. Charles, Missouri. Blow molders, used in the formation of blow molded plastic products, create hollow, thin-walled plastic components and parts. Using continuously running extruders and a tuned die-head, a parison, or tube-like piece of plastic, is formed from thermoplastic resins such as high and low density polycarbonate, polypropylene, polyvinyl chloride, polystyrene, polyamide and acetal.