Date of Award
Master of Science in Chemical Engineering - (M.S.)
Chemical Engineering and Chemistry
Cyril E. Geacintov
Saul I. Kreps
Premix molding compounds, presently manufactured in a double-armed blade kneader mixer, can now be prepared by a new and unique method utilizing a high speed densifier. Compounds processed in a kneader mixer, by virtue of its overlapping, shear mixing motion, are extremely susceptible to glass fiber degradation and. consequent mechanical strength reductions in moldings. Previously, as this was the only equipment, available with the capability to admix highly viscous materials, processors would formulate and design to compensate for the resultant property reductions that are encountered. Also typical of conventional kneader mixer processes is an inherent materials handling problem and mixing cycles proportionate to the viscosities of the resins employed.
It. has now been demonstrated on a laboratory scale, utilizing a Beardslev-Piper Speed Densifier, that high intensity mixing can manufacture premix molding compounds more efficiently and economically while exhibiting an improved product in a more handleable form. Mixing is accomplished centrifugally at high peripheral spends, thus, eliminating the pronounced effect of resin viscosity on cycle time and resulting in a product with minimum fiber degradation and maximum mechanical strength. retention.
Kurkowski, Albert Robert, "Premix molding compounds : the effect of processing technique on profitability and product integrity" (1968). Theses. 2090.