DESIGN AND ANALYTICAL APPROACH TO UNIFORM MATERIAL STRUCTURE OF INJECTION MOLDING PARTS
- 1 Faculty of Technology – Tomas Bata University in Zlin, Czech Republic
- 2 Centre of Polymer Systems – Tomas Bata University in Zlin, Czech Republic
During injection molding of highly filled polymers it is necessary to avoid any inhomogeneities arising from high shear rates/stresses created in molded parts, because they lead to uneven shrinkage after molding, dimensional instabilities and even cracks and voids in the final parts. The testing mold design to intercept so called powder-binder separation has been upgraded to a 3D cube-like model and constructed. Investigation of a tendency to phase separation is however strongly affected by a material and a surface structure of a processing tool. Therefore, flowability of various filled materials in the flow channels designed from different construction materials were tested and compared within this contribution.