The Optimisation of Masterbatch Formulations for Use in Single Screw Machines
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H. Benkreira
Abstract
Previous work by Benkreira et al. [1] has shown that the critical stage in distribution of additives in single screw extruders is the zone where the polymer melts; the subsequent pumping of the melt makes little difference to the mixture quality. It is suggested that the ideal masterbatch melts before the host polymer and coats each granule, while remaining sufficiently viscous to promote the shear heating and melting of the polymer. In order to test this hypothesis and quantify the requirements in terms of relative melting points and melt viscosities, a set of model masterbatches was produced and used for injection moulding at 1 % addition in a variety of polypropylenes and polyethylenes, but always under the same moulding conditions. Image analysis and “experts” judgement was used to rate the performance of these master-batches. The conclusions drawn from this work are that the designer of a masterbatch must consider the melting ranges of the masterbatch and its host polymer, and their relative viscosities in the temperature range of the forming process, in order to optimise the ease of distribution of the masterbatch.
© 1994, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- Tenth in a Series: Fried. Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 1. Essen, Magdeburg and Harburg (1812–1960)
- Internal Mixers
- Finite Element Modelling of Non-isothermal Viscometric Flows in Rubber Mixing
- Screw Extrusion and Mixing
- The Optimisation of Masterbatch Formulations for Use in Single Screw Machines
- Morphological Changes of a Polymer Blend into a Twin-Screw Extruder
- An In-line Melt Rheometer for Molten Plastics
- Selecting Continuous Compounding Equipment Based on Process Considerations
- Reactive Processing
- Peroxide Induced and Thermal Degradation of Polypropylene
- Reactive Blending of Polyamide 6 and Polycarbonate
- Modification of Polypropylene by Maleic Anhydride
- Fibers and Films
- Melt Strength Behaviour of Polypropylenes
- Molding
- Multilayer Injection Moulding
- Miscibility and Mechanical Properties of Poly(ether imide)/Liquid Crystalline Poly(ester imide) Blends
- The Effects of Recycling and Degradation on Parison Extrusion
- Modeling and Simulation of High Reynolds' Number Flows During Reaction Injection Mold Filling
Articles in the same Issue
- Contents
- Contents
- Editorial
- Tenth in a Series: Fried. Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 1. Essen, Magdeburg and Harburg (1812–1960)
- Internal Mixers
- Finite Element Modelling of Non-isothermal Viscometric Flows in Rubber Mixing
- Screw Extrusion and Mixing
- The Optimisation of Masterbatch Formulations for Use in Single Screw Machines
- Morphological Changes of a Polymer Blend into a Twin-Screw Extruder
- An In-line Melt Rheometer for Molten Plastics
- Selecting Continuous Compounding Equipment Based on Process Considerations
- Reactive Processing
- Peroxide Induced and Thermal Degradation of Polypropylene
- Reactive Blending of Polyamide 6 and Polycarbonate
- Modification of Polypropylene by Maleic Anhydride
- Fibers and Films
- Melt Strength Behaviour of Polypropylenes
- Molding
- Multilayer Injection Moulding
- Miscibility and Mechanical Properties of Poly(ether imide)/Liquid Crystalline Poly(ester imide) Blends
- The Effects of Recycling and Degradation on Parison Extrusion
- Modeling and Simulation of High Reynolds' Number Flows During Reaction Injection Mold Filling
