| 摘要 |
<p>With the same screw diameter as in conventional screw extruders, an improved device is disclosed wherein the screw length is reduced, whereby the material residue is reduced, the throughput is increased, the screw motive power is reduced, the temperature control is facilitated to prevent rubber scorching, and extrusion molding of a vulcanizable rubber composition is made possible at a low temperature. In a composite extruding apparatus of rubber, a gear pump (20) is connected to a tip end of a screw extruder (10) via a screen mesh (14) having a breaker plate (15), and a die head (24) is connected to an ejecting side of the gear pump (20), wherein the screw extruder (10) plasticizes a fed rubber composition (G) mainly by friction with an inner surface of a barrel (12) and by heating from outside, and extrudes the rubber composition (G) from the screen mesh (14) to a space on the inlet side of the gear pump (20). The screen mesh (14) rectifies the rubber composition (G) passing through the screen mesh (14) towards the gear pump (20) while stirring and plasticizing the rubber composition (G) by friction and shear. The gear pump (20) further stirs and plasticizes the rubber composition (G), which is fed to the space on the inlet side, by shear and compression, and gives a forcing pressure to the die head (24). <IMAGE></p> |
