How to optimize the "temperature" of the rubber extruder screw barrel
The screw structure of the rubber extruder is the main factor affecting the productivity of the extruder. If there is no reasonable screw structure, if you want to simply increase the screw speed to increase the extrusion volume, it will not succeed if it violates the objective law. The design of the high-speed rubber extruder screw is based on high speed. The plasticizing effect of this screw is lower at low speed, but the plasticizing effect is gradually improved after the screw speed is increased, and the best effect is obtained when the design speed is reached. At this time, both the higher production capacity and the qualified plasticizing effect can be achieved.
As we all know, when producing resin, the difference between the actual temperature and the recommended processing temperature of the various regions of the extruder barrel is usually not taken care of. There is a problem. Generally, the temperature of each area of the extruder barrel is lower than the ideal easy temperature. In this case, the extrusion temperature is completely dependent on the geometry of the screw and the heat of shear viscosity due to the groove depth, thread pitch and screw speed.
In order to obtain superior output and performance, most manufacturers have begun to install barrier screws on their extruders. However, as a high-performance extrusion screw, the barrier screw needs to ensure that the temperature of each area of the barrel can be adjusted. Therefore, the above problems become more prominent after using the barrier screw.
By studying the layout of the heating zone and how to locate each area of the screw, you can help determine the division and temperature settings of each area more accurately. Generally, for a single-screw extruder with a length-to-diameter ratio (L / D) in the range of 24: 1-30: 1 and equipped with a barrier screw, the conventional structure includes a feeding section, a barrier section and a metering section. They are divided into 5 temperature zones in total.
Generally, adding cold resin raw materials to the screw's barrier section will cause wear of the screw and barrel, and reasonable setting of the barrel temperature can significantly reduce the wear of the screw and barrel. For example, in the process of processing PP materials, a stable temperature curve does not reduce the viscosity of the resin to the viscosity required in the barrier area. Excessive viscosity often causes higher barrel pressure, which accelerates the screw and barrel. abrasion.