Double screw extruder barrel, including the outer cylinder and the sleeve. The outer cylinder is rectangular, with an ∞-shaped hole inside. The sleeve is positioned within the ∞-shaped hole and is matched to it.

The outer casing is equipped with at least one heating rod mounting hole at both the top and bottom ends. Utilizing the LuLong twin-screw extruder barrel effectively enhances the control accuracy of temperature, achieving a more stable extrusion process and product quality, reducing equipment failure rates, improving yield, saving energy and spare parts consumption, and creating considerable economic benefits. A good twin-screw extruder barrel minimizes energy loss, extends the lifespan of heating elements, lowers the production costs of heating elements, and importantly, avoids overcooling and overheating due to thermal inertia, shortening the thermal radiation distance, and improving the accuracy and response speed of temperature control.