a ceramic fiber band that can fulfill a plurality of functions in connection with the injection and / or extrusion process of an injection molding or extrusion apparatus , thereby reducing overall energy costs and creating a safer working environment . the ceramic band , being an insulator and having heating and / or cooling elements with a faster response contained therein , exert the desired heating / cooling effect upon the barrel portion of the injection / extrusion machine thereby raising , lowering , or maintaining the temperature of the fluid plastic compound passing through the barrel .