Extrusion Mixing Segregation Prevention via Two-Stage Additive Enrichment
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Solution Overview
Problem
The existing extrusion process is inflexible and prone to additive segregation, especially when filler percentages exceed critical values, leading to defects in polymer products and increased production costs due to the need for oversized products and excessive additive usage.
Innovation Solution
A method and plant where a base mixture with standard additive percentages is prepared in a turbomixer and then enriched with additional additives in a mixer upstream of the extruder, allowing for flexible formulation adjustments without segregation, enabling high-quality products with reduced material consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the percentage of filler (calcium carbonate) in the initial mixture is increased to reduce polymer material consumption, then production costs are reduced, but additive segregation occurs and product quality deteriorates
Solution Approach 1:
The mixing process is divided into two distinct stages: first, a base mixture is prepared in a turbomixer with polymer powders and a portion of additives; second, the remaining additives are introduced in a separate mixer upstream of the extruder. This segmentation prevents segregation by ensuring all additives are uniformly distributed in the final mixing stage before extrusion, while allowing high filler percentages to be used without compromising product quality.
Solution Approach 2:
A base mixture is prepared in advance in a turbomixer with polymer powders and a portion of additives, creating a stable foundation. This preliminary action allows the remaining additives to be added systematically in the second mixer without causing segregation, as the base mixture is already optimized for uniform distribution.
2Loss of substance
If the percentage of filler (calcium carbonate) in the initial mixture is increased to reduce polymer material consumption, then production costs are reduced, but localised accumulations of filler occur causing defects in extruded products
Solution Approach 1:
The mixing process is divided into two distinct stages: first, a base mixture is prepared in a turbomixer with polymer powders and a portion of additives; second, the remaining additives are introduced in a separate mixer upstream of the extruder. This segmentation prevents filler accumulation by ensuring all additives are uniformly distributed in the final mixing stage before extrusion, eliminating defects while allowing high filler percentages to reduce polymer consumption.
Solution Approach 2:
A second mixer acts as an intermediary device between the base mixture preparation and the extruder. This intermediary ensures uniform distribution of all additives including high percentages of filler, preventing localised accumulations that would cause defects in the extruded products.
3Adaptability or versatility
If a separate line of accumulation and distribution is created for each different mixture formulation, then product formulation flexibility is improved, but plant complexity and cost increase
Solution Approach 1:
The second mixer serves as a universal device that can accommodate different formulations by simply varying the quantity of additives added to the base mixture. This multi-functional approach allows a single mixing line to produce multiple product formulations without requiring separate accumulation and distribution lines for each formulation, reducing plant complexity while maintaining flexibility.
Solution Approach 2:
The system uses dynamic adjustment of additive quantities in the second mixer to adapt to different product formulations. Rather than having static separate lines for each formulation, the system dynamically varies the amount of additives added to the base mixture, providing flexibility without increasing plant complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the extrusion process flexibility, prevents additive segregation, and reduces production costs by allowing high additive percentages without defects, while maintaining product quality and minimizing material usage.
Implementation Method 1
the solid loose particles making up the mixture are subjected to both a purely mechanical mixing effect and to an increase in temperature
Implementation Method 2
the solid loose particles making up the mixture are subjected to both a purely mechanical mixing effect and to an increase in temperature
Implementation Method 3
introducing the base mixture into at least an extruder, via a mixer into which an additional quantity of the additive and/or the at least a further additive is introduced
Data Source
AI summary
A method for extrusion of polymer products is provided. The method includes preparing a base mixture in a turbomixer the base mixture containing polymer powders and at least an additive. The method also includes introducing the base mixture into at least an extruder, via a mixer into which an additional quantity of the additive and/or at least a further additive is introduced.