Injection molding machines have historically been sold and installed without insulation on the heater barrel. They’re sold this way because of that variation in temperature caused by the friction. The baseline heater barrel has electric resistance heater bands that are exposed to the ambient conditions of the facility.
In this case, it resulted in dramatic heat loss to the ambient air. The heat loss drove up electricity costs to maintain the heat of the barrel. The solution was to wrap the barrels in thermal insulation jackets to contain that heat at the process. The heat stays inside, meaning they need less power to maintain the temperature of the molten thermoplastic material.
That might sound like a lot of technical terms, but really it came down to a loss of heat and jacket to keep warm. With this example, these insulation jackets worked so well that the ambient temperature of the facility even dropped which made the operators excited as well. This project reduced annual operating costs by over $150,000 at no cost to the plant.