| 摘要 |
An extruder capable of obtaining a treatment volume equal to that of the conventional art without enlarging a screw diameter is provided. The extruder includes screws, a drive unit and a barrel, in which three or more screws having the same diameter and the same root diameter in a waveform shape are engaged with each other and arranged in parallel to each other horizontally or nearly horizontally while a size between axial centers is made equal. According to the above configuration, the same treatment volume as that of the conventional extruder can be handled by screws of the smaller diameter as compared with that of the conventional art. By using the screws of the smaller diameter as compared with the conventional art, temperature irregularities of an extrusion material in screw grooves, leakage of the extrusion material from the screws, an installation area of the extruder, and the like conventional trouble of various kinds can be eliminated.
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