Explain the thermal principle of a small extruder

Explain the thermal principle of a small extruder

The thermal principle of micro extruders is that the extruded plastic is hot plastic - they melt when heated and solidifies again when cooled. Where does heat come from melting plastics?

Feed preheating and cylinder / mould heater may play a role in and start is very important, but the motor input energy to overcome the resistance of the melt viscosity of motor screw generated in the cylinder body friction heat - is the most important source of all plastic, except for small systems, low speed, high melt temperature and screw plastic extrusion coating application.

For all other operations, it is important to recognize that the barrel heater is not the primary heat source in operation, so that the effect of extrusion is less than we anticipated. The temperature of the rear cylinder may still be important because it affects the speed of solid delivery in the teeth or in the feed.

The mold head and die temperature should usually be the desired melt temperature, or near this temperature, unless they are used for a specific purpose, such as glazing and fluid