Analysis of the Dispersion of Viscoelastic Clusters in the Industrial Rotor-Stator Equipment

Materials with complex rheology and viscoelasticity may require special equipment for processing, such as for dispergation. Rheological and mechanical data of the material can help with finding the required equipment or designing equipment. For highly viscous and complex material, a rotor-stator mixer can be a good choice for dispergation. Due to the laminar or creeping mechanism of flow inside the equipment, the dispergation mechanism is assumed to be a combination of the shear stress and slicing of the material by the rotor and stator blades. For the validation of the theory, the mechanical properties of the viscose identified in a previous work were used for comparison with the data from the CFD simulation of the rotor-stator mixer. The comparison showed that the rotor-stator device can overcome the complex shear modulus and ultimate strength of the material and homogenize the solution through a combination of the shear stress and slicing. The theory was also confirmed on the process line proposed for homogenization of the specific material. The stability of viscosity during the process of homogenization was measured and used as the main parameter for quality assessment.

Innovative and Robust Application of Automation for Unit Level Traceability on Dual Die configuration of Micro Electromechanical System Products

Strip mapping for unit level traceability on die attach process of semiconductor companies provide quality driven impression for end users on the market. On processing of Micro electromechanical system packages, strip map generated by operators manually, certain errors and discrepancies are encountered and inevitably experienced by the production line. This causes misleading analysis on manufacturing problems and may lead to inappropriate and incorrect solutions hurting the process line. The application of modern technology and internet of things have been considered as an improvement. This is to eliminate human intervention errors caused by manual practice and promoted fool proof design of procedures. Having a user-friendly application with integration of modern technology drives significant improvement provide benefits to both supplier and customer of the manufacturing world.

The Technology of Precision-selective Electrostatic Separation of Mixed Secondary Polymers

This technology of precision-selective electrostatic separation of mixed secondary polymers with pre-activation of their surfaces with surfactants for chemical destruction of surface polymer is described. A prototype of the process of precision selective separation of mixed polymer materials in the electrostatic field has been developed. Optimum operating modes of the process of activation of polymer surfaces with surfactant solutions as a preliminary stage of separation of mixed polymers in the electrostatic field are determined. An experimental prototype of a process line has been created for selective electrostatic separation chemically activated narrow-fractional mixed crushed polymer waste.