MIXING DEVICE

摘要

Apparatus for mixing viscous fluids such as natural and synthetic polymers and their additives under thermally controlled conditions. Accordingly, the mixing device comprises a multitude of coradially nestled bell shaped cylinders (4, 8) with alternating stationary and rotating cylinders blades. The rotating body of cylinders is attached to an external power source such as a motor driven screw (3) of a plasticating extruder. The stationary body of cylinders is attached to the container walls of the plasticating apparatus, i.e., extruder barrel, either as an integral part of the die or sandwiched between the die and extruder barrel. The stationary block is cored to provide a passage (7) for a heating or cooling fluid thus providing efficient heat exchange capabilities to the apparatus. The coaxially positioned cylindrical blades may be provided with any number of pins, blocks, blades, channels (13), etc., designed to enhance the mixing capabilities of the device by slicing, shearing and mixing the viscous fluid. The mixed fluid is allowed to exit from the mixing device through a circular channel (9) in the center of the stationary component of the mixer. Throughout the device, the direction of flow is reversed 180 degrees at the end of each blade while the fluid is subjected to transverse shearing actions and each side of the main stream is alternately exposed to the temperature controlled stationary cylindrical blades. The combined and simultaneous application of shear, mixing, and cooling results in a highly efficient melt mixer and heat exchanger.