초록 ▼

A polymer is fed upstream into an extruder. The polymer is melted and mixed in a zone (A). Cellulosic fibres are fed into the extruder in a zone (B). A mixture of the polymer and the fibres obtained in zone (B) is transported through a degassing zone (C) and then through a pressure building zone (D)

A polymer is fed upstream into an extruder. The polymer is melted and mixed in a zone (A). Cellulosic fibres are fed into the extruder in a zone (B). A mixture of the polymer and the fibres obtained in zone (B) is transported through a degassing zone (C) and then through a pressure building zone (D). The mixture is released from zone (D) into a die. Each of zones (A), (C) and (D) includes at least one positive transportation screw element. The zone (B) includes at least one positive transportation screw element, at least one kneading section and at least one negative transportation screw element such that the cellulosic fibres are fibrillated to obtain cellulosic fibres with an aspect ratio as high as possible while simultaneously mixing the cellulosic fibres with the melted polymer.

대표청구항 ▼

A polymer is fed upstream into an extruder. The polymer is melted and mixed in a zone (A). Cellulosic fibres are fed into the extruder in a zone (B). A mixture of the polymer and the fibres obtained in zone (B) is transported through a degassing zone (C) and then through a pressure building zone (D)

A polymer is fed upstream into an extruder. The polymer is melted and mixed in a zone (A). Cellulosic fibres are fed into the extruder in a zone (B). A mixture of the polymer and the fibres obtained in zone (B) is transported through a degassing zone (C) and then through a pressure building zone (D). The mixture is released from zone (D) into a die. Each of zones (A), (C) and (D) includes at least one positive transportation screw element. The zone (B) includes at least one positive transportation screw element, at least one kneading section and at least one negative transportation screw element such that the cellulosic fibres are fibrillated to obtain cellulosic fibres with an aspect ratio as high as possible while simultaneously mixing the cellulosic fibres with the melted polymer. 1997, International Conference on Solid-State Sensors and Actuators, Jun. 16-19, 1997, pp. 353-356. Gerlach, Torsten, "Pumping Gases by a Silicon Micro Pump with Dynamic Passive Valves," 1997 International Conference on Solid-State Sensors and Actuators, Jun. 16-19, 1997, pp. 357-360. Bernard, W.L., et al., "A Titanium-Nickel Shape-Memory Alloy Actuated Micropump," 1997 International Conference on Solid-State Sensors and Actuators, Jun. 16-19, 1997, pp. 361-364. Schomburg, W. K.; et al., "Long-Term Performance Analysis of Thermo-Pneumatic Micropump Actuators, " 1997 International Conference on Solid-State Sensors and Actuators, Jun. 16-19, 1997, pp. 365-368. Jiang, X. N, et al., "Experiments and Analysis for Micro-Nozzle/Diffuser Flow and Micro Valveless Pumps," 1997 International Conference on Solid-State Sensors and Actuators, Jun. 16-19, 1997, pp. 369-372. Ahn, Si-Hong, et al., Fabrication and Experiment of Planar Micro Ion Drag Pump, 1997 International Conference on Solid-State Sensors and Actuators, Jun. 16-19, 1997, pp. 373-376. Stehr, M., et al., "The Selfpriming Vamp," 1997 International Conference on Solid-State Sensors and Actuators, Jun. 16-19, 1997, pp. 351-352.