Double screw extruder closed-end copper heater, model 75, including a crushing chamber. The chamber has two symmetrical annular grooves on either side of the top, with an internal toothed ring centered at the top. Inside the grooves, there are sliding rods, and at the top of the rods are mounting rods. A drive motor is positioned at the center bottom of the mounting rods, with a gear one at the output end of the motor. A second shaft is located at the center bottom of gear one. The double screw extruder features a copper closed-end heater, which preheats the plastic for processing, crushes larger plastic blocks, making them more amenable to rapid heating and melting. It also facilitates quick stirring of the heated plastic, ensuring thorough mixing and dispersion of clumped plastic, thereby enhancing the melting rate.