Internal mixing twin screw TPU granulator

TPU has excellent aging resistance, plasticity and high elasticity. It can be processed and used without vulcanization. Leftover materials can be reused. It is widely used in the production of high-grade elastomer, plastic modification, adhesive, lubricating oil tackifier, filler and sheath materials for wires and cables. Now it is widely used in highway asphalt and sports track. TPU has good weather resistance, heat resistance, compression deformation resistance and excellent mechanical properties.

TPU masterbatch twin screw granulator function:

The function of TPU master grain twin-screw granulator is to transport the added solid materials along the screw to the die direction. At the same time, in this transportation process, the loose powder low loose density materials will be compacted or the fullness of the granular materials in the screw groove will be improved to promote the melting and plasticity of the materials in the downstream. The screw configuration of this section shall be: the screw element connected with the feeding section shall be the positive screw element with large lead, and then the positive screw element with smaller screw groove volume shall be used. By using the screw section composed of the screw elements with smaller lead segments, the fullness of the screw groove gradually increases along the conveying direction, so that the material can be compressed and compacted.

Screw structure of TPU masterbatch twin screw granulator:

The local configuration of the screw in the melt plasticizing stage depends on the specific heat, melting point, melt viscosity of the material and the particle size of the polymer in the solid state. The goal of the local screw configuration design for melting and plasticizing is to melt the material uniformly and rapidly at a set temperature without inputting too much energy into the material. There are two heat sources for melting materials: one is the external heat provided by the barrel heater, the other is the shear heat introduced by the screw, the latter is the main one. In order to introduce shear heat, kneading plate, reverse thread element, reverse (positive and negative) internal mixer rotor type (or large lead) non-standard thread element shall be set in the melting and plasticizing section, and these elements shall be effectively combined with the upstream forward thread element at the predetermined screw axial position. Because of the high viscosity of the melt, the polymer melt can provide a great force to the nano aggregate, so the use of high shear screw configuration in this section is very conducive to dispersion and mixing.