Two-Channel Extrusion Die for Single-Run Mooney Correction
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Solution Overview
Problem
Conventional Mooney correction methods require multiple dies and multiple test cycles, are time-consuming, and are difficult to ensure accurate shear stress across different channels, necessitating expensive equipment and complex data treatment.
Innovation Solution
A two-channel extrusion die with specific structural relations ensures both channels are under the same pressure head, allowing for Mooney correction with a single extrusion operation without die changes or complex data treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional Mooney correction method using multiple dies and multiple test cycles is employed, then measurement precision can be achieved, but loss of time and device complexity increase significantly
Solution Approach 1:
The patent combines multiple testing functions into a single integrated die structure. The multi-channel die allows simultaneous testing of multiple samples or multiple L/D ratios in one extrusion operation, eliminating the need for sequential testing with separate dies. This merging of testing capabilities directly reduces testing time while maintaining measurement precision through the single-screw extruder system that ensures consistent shear stress conditions across all channels.
Solution Approach 2:
The die structure is designed with universal applicability for Mooney correction testing. By incorporating multiple channels with different L/D ratios in a single die, the system can perform multiple measurements that would traditionally require multiple specialized dies. The single-screw extruder setup provides universal shear stress application across all channels, making the system multi-functional for comprehensive viscosity characterization.
2Measurement precision
If conventional Mooney correction method with multiple separate channels is used, then measurement precision can be maintained, but device complexity and data treatment complexity increase
Solution Approach 1:
The patent merges multiple testing channels into a single integrated die assembly that is mounted on a standard single-screw extruder. This consolidation reduces device complexity by eliminating the need for multiple separate rheometers or complex multi-rheometer configurations. The unified die structure with multiple channels allows simultaneous measurements under controlled shear stress conditions, maintaining precision while simplifying the overall testing apparatus.
Solution Approach 2:
The die structure implements local quality by providing different L/D ratios in different channels while maintaining consistent inlet conditions and shear stress application. Each channel is locally optimized for specific measurement requirements, yet all channels benefit from the unified pressure and flow conditions provided by the single-screw extruder system. This local differentiation within a unified structure enables precise measurements without increasing overall device complexity.
3Measurement precision
If multiple dies with different diameters are tested separately, then Mooney correction data can be obtained, but productivity decreases due to multiple test cycles
Solution Approach 1:
The patent enables continuous useful action by performing multiple Mooney correction measurements in a single extrusion operation. The multi-channel die allows simultaneous flow through channels with different L/D ratios, continuously generating the data needed for wall slip velocity determination without stopping to change dies or reconfigure the system. This continuous measurement process significantly improves productivity while maintaining the precision required for accurate slip velocity calculation.
Solution Approach 2:
The die structure is pre-configured with multiple channels of different L/D ratios before testing begins. This preliminary arrangement of testing pathways allows the operator to perform comprehensive Mooney correction measurements in a single run, eliminating the need for sequential die changes and pre-planning multiple test cycles. The pre-integrated multi-channel structure enables efficient data collection for wall slip velocity determination.
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
Enables easy, quick, and cost-effective Mooney correction by ensuring accurate shear stress across channels, reducing the need for multiple tests and expensive rheometers.
Implementation Method 1
both channels to be under the same pressure head of from an inlet to an outlet of the channel during an extrusion operation
Implementation Method 2
causing the same shear stress for the two channels with an equal L/D ratio
Data Source
AI summary
Disclosed is a two-channel extrusion die for Mooney correction to determine true shear viscosity of a resin, comprising: a cylindrical body; and two channels, each of the two channels having a circular and constant cross section and extending linearly throughout the channel along a longitudinal direction of the cylindrical body, and when a big channel A has a longitudinal length LA and a diameter DA of a cross section, and a small channel B has a longitudinal length LB and a diameter DB of a cross section, all of three relations (i) LA>LB; (ii) DA>DB; and (iii) LA/DA=LB/DB being fulfilled, thereby causing each of the two channels to equally be under a given pressure head of from an inlet to an outlet of the channel during an extrusion operation of a fluid of the resin.