| 摘要 |
<p>A screw rod of a single screw extruder comprises a feeding section (1), a compression separation section (2), and a metering section (4) which are sequentially arranged from front to back. The feeding section (1) is provided with a main thread (5), the compression separation section (2) is provided with a main thread (5) and an auxiliary thread (6), and the metering section (4) is provided with a main thread (5). A mixed section (3) is arranged between the compression separation section (2) and the metering section (4), is provided with main threads (5) and auxiliary threads (6), and comprises a plurality of mixed subsections which are sequentially arranged from front to back. The bottom diameters of the main threads on the odd numbers of mixed subsections gradually decrease from front to back, and the bottom diameters of the auxiliary threads on the odd numbers of mixed subsections gradually increase. The bottom diameters of the main threads on the even numbers of mixed subsections gradually increase from front to back, and the bottom diameters of the auxiliary threads on the even numbers of mixed subsections gradually decrease from front to back. The bottom diameters of the main and auxiliary threads on the mixed sections change alternately, so that materials can be alternately compressed and released, and completely plasticized and uniformly mixed. Therefore, the plastic material extruded by the single screw extruder with the screw rod has high viscosity, and a plastic product produced by the extruder has few crystal points and bubbles.</p> |
