Production line of compound coating machine
DATE：2021/5/17 9:10:11 / READ： / SOURCE：This station
Production line of compound coating machine
Reciprocating single screw extruderWith the rapid development of automobile, household appliances, communications, military and other industries, the performance requirements of plastic special materials are higher and higher. The performance of single screw extruder and twin screw extruder, which occupy the main position in the plastic modification industry, can not meet the requirements of blending, filling, reinforcing and toughening. The reciprocating single screw mixing extruder just has the characteristics of uniform shear, two dispersion, equal length, high filling and drawing melt, which combines the advantages of single screw extruder and twin screw extruder. With a complete set of thread combination components and supporting equipment, it can be widely used. In one machine, it can realize mixing, mixing, plasticizing, dispersing, shearing, stretching, degassing and granulating, so that the interface area of melt flow in the machine is much larger than that of general shear flow, and the melt temperature control is accurate. Therefore, using reciprocating single screw extruder to produce some high-tech, high value-added products has gradually become a trend. Reciprocating single screw mixing extruder was invented by Germany in 1945 and manufactured by buss AG of Switzerland. It is different from the ordinary single screw extruder in that the barrel of the extruder is divided, and there are many rows of pins with different functions on the barrel. The screw rotates and reciprocates axially. Each rotation of the screw completes an axial reciprocating displacement. In order to avoid the interference between the pin and the screw edge, the screw edge must be interrupted, and the minimum gap between the screw edge and the pin must be moderate in order to ensure the material to be fully sheared. This unique structure enables the material in the interrupted screw edge to be plasticized and mixed more fully under the shearing and dispersing action of the pin. Therefore, the reciprocating single screw extruder can not only produce epoxy molding compound, but also produce epoxy molding compound Powder coatings, engineering plastics, wire and cable materials, soft and hard PVC, thermosetting plastics, color masterbatch, but also suitable for food processing, reactive mixing and special mixing, especially in the processing of materials with high mixing quality requirements and sensitive to shear and heating, it can show the advantages of low pressure, low shear, low temperature rise and high mixing quality.
working principle
The reciprocating single screw mixing technology comes out of the machine. A unique building block screw block is designed on the screw mandrel. It is disconnected three times in a pitch to become a mixing screw block. Corresponding to these gaps, three rows of mixing pins are arranged on the inner sleeve of the machine barrel. During the radial rotation process, the screw makes axial reciprocating motion at the same time. Once for each rotation. Because of this special movement mode and the action of mixing screw block and pin, the material is not only sheared between mixing pin and irregular trapezoidal mixing block, but also transported back and forth. The countercurrent movement of material adds a very useful axial mixing movement to radial mixing. The melt is constantly cut off, reversed, kneaded and stretched, and the simple layered shear mixing is interrupted regularly, Due to the simultaneous mixing in radial and axial direction, the mixing effect is enhanced, and the best dispersion mixing and distribution mixing are ensured, so the homogenization time is short. In addition, the meshing of mixing pin and screw block also improves the self-cleaning ability of barrel. Through proper screw block combination, stable working pressure and temperature can be ensured to prevent material degradation in the barrel. Because the screw thread of the kneading element is interrupted, the pressure acting on the polymer is very small and there is no obvious temperature rise. The single screw extruder and twin screw extruder shear the thin polymer under high shear and high radial pressure, which will inevitably cause a large temperature rise of the melt and affect the principle of low temperature extrusion. Compared with other machines, under the condition of the same diameter, the length and diameter of the screw are shorter, and the torque is transmitted in a shorter distance, so the torsion deformation of the screw is smaller.
Production line of compound coating machine www.handern.com
Author：admin