| 摘要 |
PURPOSE:To provide a plastic-color changeover method, in which the generation of resin burning can be prevented and material loss can be reduced. CONSTITUTION:A resin having the same color at every 50% of required quantity to be extruded from crossheads is extruded to the crossheads from two first and second extruders 1, 2, respectively. The resin of 100% of required quantity is extruded to the crosshead from the first extruder 1, and a color is changed while making the resin of the second extruder 2 overflow. Extrusion in the required quantity of the resin from the first extruder 1 to the crosshead is changed over to extrusion in the required quantity from the second extruder 2 to the crosshead, and the color is changed while making the resin of the first extruder 1 overflow. The resin having the same color at every 50% of required quantity is extruded to the crossheads from the two first and second extruders 1, 2. |
